CN113908931A - Special repairing agent for boiler flue gas desulfurization tower and production process thereof - Google Patents
Special repairing agent for boiler flue gas desulfurization tower and production process thereof Download PDFInfo
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- CN113908931A CN113908931A CN202111169085.2A CN202111169085A CN113908931A CN 113908931 A CN113908931 A CN 113908931A CN 202111169085 A CN202111169085 A CN 202111169085A CN 113908931 A CN113908931 A CN 113908931A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 72
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 51
- 230000023556 desulfurization Effects 0.000 title claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000003546 flue gas Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000005260 corrosion Methods 0.000 claims abstract description 97
- 239000011248 coating agent Substances 0.000 claims abstract description 48
- 238000000576 coating method Methods 0.000 claims abstract description 48
- 239000002994 raw material Substances 0.000 claims abstract description 44
- 238000005299 abrasion Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 230000007797 corrosion Effects 0.000 claims description 88
- 239000011521 glass Substances 0.000 claims description 50
- 238000005507 spraying Methods 0.000 claims description 50
- 238000003756 stirring Methods 0.000 claims description 48
- 239000002245 particle Substances 0.000 claims description 38
- 239000003822 epoxy resin Substances 0.000 claims description 34
- 229920000647 polyepoxide Polymers 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 32
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 30
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 30
- 238000005488 sandblasting Methods 0.000 claims description 24
- 230000003009 desulfurizing effect Effects 0.000 claims description 21
- 239000000853 adhesive Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 19
- 229920001567 vinyl ester resin Polymers 0.000 claims description 19
- 239000011324 bead Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 18
- 238000000227 grinding Methods 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910021389 graphene Inorganic materials 0.000 claims description 17
- 229920002635 polyurethane Polymers 0.000 claims description 17
- 239000004814 polyurethane Substances 0.000 claims description 17
- 229920000715 Mucilage Polymers 0.000 claims description 16
- 229910001080 W alloy Inorganic materials 0.000 claims description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 16
- 229910052593 corundum Inorganic materials 0.000 claims description 16
- 239000010431 corundum Substances 0.000 claims description 16
- 239000010881 fly ash Substances 0.000 claims description 16
- 229910052573 porcelain Inorganic materials 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 16
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 16
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 16
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 16
- MAKDTFFYCIMFQP-UHFFFAOYSA-N titanium tungsten Chemical compound [Ti].[W] MAKDTFFYCIMFQP-UHFFFAOYSA-N 0.000 claims description 16
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 16
- 229920002554 vinyl polymer Polymers 0.000 claims description 16
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 15
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 15
- 239000004917 carbon fiber Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 15
- 239000004005 microsphere Substances 0.000 claims description 15
- 239000010451 perlite Substances 0.000 claims description 13
- 235000019362 perlite Nutrition 0.000 claims description 13
- 239000000377 silicon dioxide Substances 0.000 claims description 13
- 235000012239 silicon dioxide Nutrition 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- 238000002161 passivation Methods 0.000 claims description 6
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 5
- 229960001124 trientine Drugs 0.000 claims description 5
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- QOHMWDJIBGVPIF-UHFFFAOYSA-N n',n'-diethylpropane-1,3-diamine Chemical compound CCN(CC)CCCN QOHMWDJIBGVPIF-UHFFFAOYSA-N 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 230000003116 impacting effect Effects 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 10
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000035882 stress Effects 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003082 abrasive agent Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Paints Or Removers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a special repairing agent for a boiler flue gas desulfurization tower and a production process thereof, wherein the repairing agent is a multilayer composite coating and comprises an abrasion-resistant layer, a binding layer and an anti-corrosion layer which are sequentially coated on the inner wall of the desulfurization tower from top to bottom, the anti-corrosion layer is tightly attached to the inner wall of the desulfurization tower, the total thickness of the repairing agent is 1.8-2.5 mm, the thickness of the abrasion-resistant layer is 0.5-0.6 mm, the thickness of the binding layer is 1-1.5 mm, and the thickness of the anti-corrosion layer is 0.3-0.4 mm. The repairing agent disclosed by the invention forms a composite coating structure with an anti-abrasion outer layer and an anti-corrosion inner layer, and each coating can form an interpenetrating network structure in a curing process, so that all raw materials generate a synergistic effect, the wear-resisting and corrosion-resisting properties can be effectively improved, and the use requirements can be well met.
Description
Technical Field
The invention belongs to the technical field of repair of an inner wall of a desulfurizing tower, and particularly relates to a special repair agent for a boiler flue gas desulfurizing tower and a production process thereof.
Background
Because the flue gas of the boiler contains a large amount of SO and SO2Before the boiler flue gas is discharged to the outside environment, the boiler flue gas must be desulfurized to remove the sulfides contained in the flue gas so as to meet the environmental protection standard. The desulfurization tower is used as an important device for boiler flue gas desulfurization, and the performance of the desulfurization tower directly determines the desulfurization effect. At present, a limestone-gypsum wet desulphurization process is basically adopted in a desulphurization tower, and the inside of the desulphurization tower is kept at about 100 ℃ for a long time, and the process has the characteristics of strong medium corrosivity, large solid content of sulfide absorption liquid, strong abrasiveness and the like, so that the inner wall of the desulphurization tower is seriously damaged, and the service life of the inner wall of the desulphurization tower is often less than one year. Therefore, the control of corrosion prevention and wear prevention inside the desulfurization tower is always one of the key problems influencing the stable operation of the system.
At present, in the prior art, a rubber corrosion-resistant lining is usually adhered to the inner wall of a desulfurizing tower or a polyester flake daub corrosion-resistant lining is coated on the inner wall of the desulfurizing tower, so that the rubber corrosion-resistant lining is used as a main means for preventing corrosion and abrasion of the inner wall of the desulfurizing tower. However, the rubber corrosion-resistant lining is not firmly bonded with the steel plate due to lining rubber in the using process, the phenomena of bulging, peeling, damage and falling off frequently occur in the washing process of flue gas and slurry in the operation process, and even the tower wall is corroded and perforated by the flue gas, so that the slurry in the desulfurization tower leaks outwards, and the safe operation of equipment is seriously influenced; in the using process of the polyester scale daub corrosion-resistant lining, as the main solid components in the slurry in the desulfurizing tower are gypsum crystals, a small amount of calcium sulfite and calcium carbonate particles exist, and the flue gas also contains other solid impurities such as fly ash and the like, the substances have strong abrasion action on the corrosion-resistant layer of the polyester scale daub corrosion-resistant lining, and certain part of the corrosion-resistant layer is damaged to a certain extent after being washed away for a long time, so that the corrosion-resistant layer falls off, a steel plate on the wall of the tower is corroded, and the protection effect is lost.
In conclusion, according to the working environment of the desulfurizing tower, the problem of protecting the inner wall of the desulfurizing tower cannot be fundamentally solved by only corrosion prevention or abrasion prevention. Therefore, a new repairing agent special for the boiler flue gas desulfurization tower is urgently needed to be developed to solve the technical problem that the inner wall of the desulfurization tower is easy to corrode and abrade, so that the steel plate on the tower wall of the desulfurization tower is corroded, and the safe operation of equipment is seriously influenced.
Disclosure of Invention
The invention aims to provide a special repairing agent for a boiler flue gas desulfurization tower and a production process thereof, and aims to solve the technical problem that in the prior art, the inner wall of the desulfurization tower is easy to corrode and abrade, so that a steel plate on the tower wall of the desulfurization tower is corroded, and the safe operation of equipment is seriously influenced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the repairing agent is a multilayer composite coating and comprises an abrasion-resistant layer, a bonding layer and a corrosion-resistant layer which are sequentially coated on the inner wall of the desulfurization tower from top to bottom, wherein the corrosion-resistant layer is tightly attached to the inner wall of the desulfurization tower, the total thickness of the repairing agent is 1.8-2.5 mm, the thickness of the abrasion-resistant layer is 0.5-0.6 mm, the thickness of the bonding layer is 1-1.5 mm, and the thickness of the corrosion-resistant layer is 0.3-0.4 mm.
Preferably, the wear-resistant layer is prepared from the following raw materials in parts by weight: 20-40 parts of vinyl glass flake mucilage, 5-10 parts of alumina corundum porcelain ball, 5-10 parts of modified hollow glass microsphere, 5-10 parts of silicon carbide, 5-10 parts of zirconia, 5-10 parts of titanium-tungsten alloy powder and 30-40 parts of styrene.
Preferably, the wear-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of vinyl glass flake mucilage, 8 parts of alumina corundum porcelain ball, 7 parts of modified hollow glass microsphere, 8 parts of silicon carbide, 7 parts of zirconia, 8 parts of titanium-tungsten alloy powder and 35 parts of styrene.
Preferably, the bonding layer is prepared from the following raw materials in parts by weight: 30-40 parts of silicon dioxide with the particle size of 20-30 nm, 10-15 parts of expanded perlite, 15-20 parts of vinyl ester resin and 15-20 parts of tetraethylenepentamine.
Preferably, the corrosion-resistant layer is prepared from the following raw materials in parts by weight: 20-40 parts of polyurethane modified epoxy resin, 20-40 parts of graphene modified epoxy resin, 3-4 parts of curing agent, 10-20 parts of fly ash, 10-15 parts of carbon fiber, 10-15 parts of silicon steel, 10-15 parts of ceramic particles and 40-50 parts of acetone.
Preferably, the corrosion-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of polyurethane modified epoxy resin, 30 parts of graphene modified epoxy resin, 4 parts of curing agent, 15 parts of fly ash, 13 parts of carbon fiber, 13 parts of silicon steel, 13 parts of ceramic particles and 45 parts of acetone.
Preferably, the curing agent is any one of diethylenetriamine, triethylene tetramine, diethylaminopropylamine and tetraethylenepentamine.
The invention also provides a production process of the special repairing agent for the boiler flue gas desulfurization tower, which comprises the following steps:
(1) preparation of the corrosion-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting the fly ash, the carbon fiber, the silicon steel and the ceramic particles into a ball mill for grinding, wherein the rotating speed of the ball mill is 700-1200r/min, and grinding for 1h at the temperature of 20-30 ℃ to obtain a premix A; putting the polyurethane modified epoxy resin, the graphene modified epoxy resin and acetone into a stirrer, and uniformly stirring and mixing to obtain a premix B; slowly adding the premix A into the premix B in batches under the condition of continuous stirring, adding the curing agent after the feeding is finished and uniformly stirred and mixed, and uniformly stirring and mixing again to obtain the corrosion-resistant coating; spraying the corrosion-resistant coating to an area to be repaired on the inner wall of the desulfurization tower, polishing the surface of the area to be repaired before spraying, wherein the spraying thickness is 0.3-0.4 mm, obtaining a corrosion-resistant layer after spraying, and drying the corrosion-resistant layer at the drying temperature of 50-60 ℃ for 3-4 h;
(2) preparation of the bonding layer: weighing the raw materials in part by weight, putting vinyl ester resin into a stirring kettle with a heating function, preheating the vinyl ester resin for 2 hours at 70 ℃, adding tetraethylenepentamine into the stirring kettle, stirring and mixing the mixture uniformly, mixing silicon dioxide and expanded perlite to obtain premix C, slowly adding the premix C into the stirring kettle in batches, and stirring and mixing the mixture uniformly after the addition to obtain the combined coating; spraying the bonding coating on the surface of the corrosion-resistant layer to obtain a bonding layer, wherein the spraying thickness is 1-1.5 mm;
(3) preparing a wear-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting silicon carbide, zirconia and titanium-tungsten alloy powder into a ball mill for grinding, wherein the rotating speed of the ball mill is 800-1100r/min, and grinding for 1.5h at the temperature of 20-30 ℃ to obtain premix D; putting the vinyl glass flake mucilage and styrene into a stirrer, and uniformly stirring and mixing to obtain a premix E; slowly adding the premix D into the premix E in batches under the state of continuous stirring, stirring and uniformly mixing after the feeding is finished, sequentially adding alumina corundum porcelain balls and modified hollow glass microspheres, and then mixing and stirring to obtain the wear-resistant coating; and after the combined coating is sprayed on the surface of the corrosion-resistant layer, immediately spraying the wear-resistant coating on the surface of the combined layer, wherein the spraying thickness is 0.5-0.6 mm, obtaining the wear-resistant layer after spraying, drying the wear-resistant layer at the drying temperature of 50-55 ℃ for 1-2 h.
Preferably, the preparation method of the modified hollow glass bead in the step (3) comprises the following steps: and (2) soaking the hollow glass beads with the particle size of 40-70 microns in a silane coupling agent aqueous solution with the volume concentration of 1.8% for 1.5-2h, taking out and drying after soaking to obtain the modified hollow glass beads.
Preferably, when the surface of the area to be repaired is polished in the step (1), firstly, the surface of the area to be repaired is polished to be flat by using sand paper or a grinder, then, full-automatic sand blasting equipment is used for performing surface sand blasting passivation treatment, accelerated abrasive particles are impacted on the surface of the area to be repaired, and the degree of finish and the stress state of the surface of the area to be repaired are changed; the full-automatic sand blasting equipment is three-dimensional rotary sand blasting equipment, the distance between a nozzle and the surface of an area to be repaired is 10-15cm, the included angle between the spraying direction and the normal line of the surface of the area to be repaired is 40-45 degrees, the spraying pressure is 0.6-0.7 MPa, and the grain diameter of sand sprayed by the sand blasting equipment is less than 5 mm.
Compared with the prior art, the invention has the following advantages: (1) the repairing agent is a multi-layer composite coating, an outer-layer anti-abrasion and inner-layer anti-corrosion composite coating structure is formed, each coating can form an interpenetrating network structure in the curing process, all raw materials generate a synergistic effect, the repairing agent has excellent corrosion resistance, wear resistance, aging resistance, hot water permeability resistance and enough toughness, can resist the vibration of equipment and the internal stress caused by different expansion coefficients of different materials, has excellent adhesive force with a base material, is high in strength and not easy to crack, effectively improves the wear resistance and corrosion resistance, greatly improves the protective performance of the repairing agent, and prolongs the service life of a desulfurizing tower; the product can be sprayed after the desulfurization tower is simply treated after the shutdown, so that the construction is convenient, and the practicability is very high; (2) the high-performance wear-resistant particle alumina corundum porcelain ball, silicon carbide, zirconium oxide, titanium tungsten alloy powder and vinyl glass flake mucilage are compounded to obtain the high-performance wear-resistant anticorrosive polymeric material, so that the wear of a desulfurization tower due to erosion, corrosion and decoration can be effectively resisted, the modified hollow glass microsphere belongs to a hollow glass sphere with a small size, the flowability of a wear-resistant coating can be improved by adding the modified hollow glass microsphere, the workability of the wear-resistant coating is improved, the solvent consumption is reduced, the number of microscopic pores left in the curing process of the wear-resistant coating due to solvent volatilization is reduced, the compactness of a wear-resistant layer is improved, the strength of the wear-resistant layer can be improved, the medium can be prevented from being soaked into the interior of the wear-resistant layer along the solvent volatilization, and the high-performance wear-resistant anticorrosive polymeric material has excellent wear resistance and corrosion resistance; (3) the vinyl ester resin is added into the combined layer, so that the vinyl ester resin has excellent corrosion resistance, and also has good adhesive force, is a corrosion-resistant coating and a good base coat, can be well adhered with the wear-resistant layer and the corrosion-resistant layer, avoids falling-off phenomenon among all layers, and adds the silicon dioxide and the expanded perlite with the grain diameter of 20nm-30nm into the combined layer, so that the combined layer has better grain grading, the diameter distribution of the inner holes is more uniform, the compactness of the combined layer is improved, the medium is reduced from being immersed into the combined layer along the inner holes, and the vinyl ester resin has excellent wear resistance and corrosion resistance; (4) the polyurethane modified epoxy resin and the graphene modified epoxy resin are added into the corrosion-resistant layer, the polyurethane modified epoxy resin and the graphene modified epoxy resin are matched for use, the corrosion-resistant layer is resistant to acid and alkali, salt mist and chloride ions, good in permeability, strong in adhesive force, high in impact strength larger than 500N.mm, and 1mm in flexibility, the finally prepared corrosion-resistant layer is more than 150 mu m in one-step spraying thickness, the number of pinholes in the coating is reduced by more than 2/3 compared with that of a common anticorrosive coating under the same condition, and the corrosion resistance is excellent.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The invention provides a special repairing agent for a boiler flue gas desulfurization tower, which is a multilayer composite coating and comprises an abrasion-resistant layer, a binding layer and an anti-corrosion layer, wherein the abrasion-resistant layer, the binding layer and the anti-corrosion layer are sequentially coated on the inner wall of the desulfurization tower from top to bottom, the anti-corrosion layer is tightly attached to the inner wall of the desulfurization tower, the total thickness of the repairing agent is 1.8-2.5 mm, the thickness of the abrasion-resistant layer is 0.5-0.6 mm, the thickness of the binding layer is 1-1.5 mm, and the thickness of the anti-corrosion layer is 0.3-0.4 mm.
The wear-resistant layer is prepared from the following raw materials in parts by weight: 20-40 parts of vinyl glass flake mucilage, 5-10 parts of alumina corundum porcelain ball, 5-10 parts of modified hollow glass microsphere, 5-10 parts of silicon carbide, 5-10 parts of zirconia, 5-10 parts of titanium-tungsten alloy powder and 30-40 parts of styrene.
The wear-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of vinyl glass flake mucilage, 8 parts of alumina corundum porcelain ball, 7 parts of modified hollow glass microsphere, 8 parts of silicon carbide, 7 parts of zirconia, 8 parts of titanium-tungsten alloy powder and 35 parts of styrene.
The bonding layer is prepared from the following raw materials in parts by weight: 30-40 parts of silicon dioxide with the particle size of 20-30 nm, 10-15 parts of expanded perlite, 15-20 parts of vinyl ester resin and 15-20 parts of tetraethylenepentamine.
The corrosion-resistant layer is prepared from the following raw materials in parts by weight: 20-40 parts of polyurethane modified epoxy resin, 20-40 parts of graphene modified epoxy resin, 3-4 parts of curing agent, 10-20 parts of fly ash, 10-15 parts of carbon fiber, 10-15 parts of silicon steel, 10-15 parts of ceramic particles and 40-50 parts of acetone.
The corrosion-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of polyurethane modified epoxy resin, 30 parts of graphene modified epoxy resin, 4 parts of curing agent, 15 parts of fly ash, 13 parts of carbon fiber, 13 parts of silicon steel, 13 parts of ceramic particles and 45 parts of acetone.
The curing agent is any one of diethylenetriamine, triethylene tetramine, diethylaminopropylamine and tetraethylenepentamine.
The invention also provides a production process of the special repairing agent for the boiler flue gas desulfurization tower, which comprises the following steps:
(1) preparation of the corrosion-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting the fly ash, the carbon fiber, the silicon steel and the ceramic particles into a ball mill for grinding, wherein the rotating speed of the ball mill is 700-1200r/min, and grinding for 1h at the temperature of 20-30 ℃ to obtain a premix A; putting the polyurethane modified epoxy resin, the graphene modified epoxy resin and acetone into a stirrer, and uniformly stirring and mixing to obtain a premix B; slowly adding the premix A into the premix B in batches under the condition of continuous stirring, adding the curing agent after the feeding is finished and uniformly stirred and mixed, and uniformly stirring and mixing again to obtain the corrosion-resistant coating; spraying the corrosion-resistant coating to an area to be repaired on the inner wall of the desulfurization tower, polishing the surface of the area to be repaired before spraying, wherein the spraying thickness is 0.3-0.4 mm, obtaining a corrosion-resistant layer after spraying, and drying the corrosion-resistant layer at the drying temperature of 50-60 ℃ for 3-4 h;
(2) preparation of the bonding layer: weighing the raw materials in part by weight, putting vinyl ester resin into a stirring kettle with a heating function, preheating the vinyl ester resin for 2 hours at 70 ℃, adding tetraethylenepentamine into the stirring kettle, stirring and mixing the mixture uniformly, mixing silicon dioxide and expanded perlite to obtain premix C, slowly adding the premix C into the stirring kettle in batches, and stirring and mixing the mixture uniformly after the addition to obtain the combined coating; spraying the bonding coating on the surface of the corrosion-resistant layer to obtain a bonding layer, wherein the spraying thickness is 1-1.5 mm;
(3) preparing a wear-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting silicon carbide, zirconia and titanium-tungsten alloy powder into a ball mill for grinding, wherein the rotating speed of the ball mill is 800-1100r/min, and grinding for 1.5h at the temperature of 20-30 ℃ to obtain premix D; putting the vinyl glass flake mucilage and styrene into a stirrer, and uniformly stirring and mixing to obtain a premix E; slowly adding the premix D into the premix E in batches under the state of continuous stirring, stirring and uniformly mixing after the feeding is finished, sequentially adding alumina corundum porcelain balls and modified hollow glass microspheres, and then mixing and stirring to obtain the wear-resistant coating; and after the combined coating is sprayed on the surface of the corrosion-resistant layer, immediately spraying the wear-resistant coating on the surface of the combined layer, wherein the spraying thickness is 0.5-0.6 mm, obtaining the wear-resistant layer after spraying, drying the wear-resistant layer at the drying temperature of 50-55 ℃ for 1-2 h.
The preparation method of the modified hollow glass beads in the step (3) comprises the following steps: and (2) soaking the hollow glass beads with the particle size of 40-70 microns in a silane coupling agent aqueous solution with the volume concentration of 1.8% for 1.5-2h, taking out and drying after soaking to obtain the modified hollow glass beads. After the hollow glass beads are modified, the interface strength of the surfaces of the hollow glass beads can be improved, so that the connection performance between the wear-resistant layer and the bonding layer is improved.
When the surface of the area to be repaired is polished in the step (1), firstly, polishing and flattening the surface of the area to be repaired by using sand paper or a grinding machine, then, carrying out surface sand blasting passivation treatment by using full-automatic sand blasting equipment, and impacting accelerated abrasive particles on the surface of the area to be repaired to change the finish degree and stress state of the surface of the area to be repaired; the full-automatic sand blasting equipment is three-dimensional rotary sand blasting equipment, the distance between a nozzle and the surface of an area to be repaired is 10-15cm, the included angle between the spraying direction and the normal line of the surface of the area to be repaired is 40-45 degrees, the spraying pressure is 0.6-0.7 MPa, and the grain diameter of sand sprayed by the sand blasting equipment is less than 5 mm. The method has the advantages that accelerated abrasive particles are impacted to the surface of the area to be repaired by utilizing a surface sand blasting passivation process, so that a derusting layer, a deburring layer and an oxidation removing layer are achieved, the smoothness and the stress state of the surface of the area to be repaired are changed, compared with manual polishing, the polishing efficiency can be improved, the roughness of the surface of the area to be repaired can be changed by changing the abrasives with different particle sizes, the roughness of the surface of the area to be repaired is uniform and consistent through sand blasting, and the binding force between the surface of the area to be repaired and the corrosion resistant layer is greatly improved.
Example 1
The utility model provides a special repairing agent of boiler flue gas desulfurization tower, the repairing agent is multilayer composite coating, includes from the top down and coats wearing layer, anchor coat, corrosion-resistant layer on the desulfurizing tower inner wall in proper order, and corrosion-resistant layer closely laminates with the inner wall of desulfurizing tower, the gross thickness of repairing agent is 1.8mm, and wherein the thickness of wearing layer is 0.5mm, the thickness of anchor coat is 1mm, the thickness of corrosion-resistant layer is 0.3 mm.
The wear-resistant layer is prepared from the following raw materials in parts by weight: 20 parts of vinyl glass flake mucilage, 5 parts of alumina corundum porcelain ball, 5 parts of modified hollow glass microsphere, 5 parts of silicon carbide, 5 parts of zirconia, 5 parts of titanium-tungsten alloy powder and 30 parts of styrene.
The bonding layer is prepared from the following raw materials in parts by weight: 30 parts of silicon dioxide with the particle size of 20nm-30nm, 10 parts of expanded perlite, 15 parts of vinyl ester resin and 15 parts of tetraethylenepentamine.
The corrosion-resistant layer is prepared from the following raw materials in parts by weight: 20 parts of polyurethane modified epoxy resin, 20 parts of graphene modified epoxy resin, 3 parts of curing agent diethylenetriamine, 10 parts of fly ash, 10 parts of carbon fiber, 10 parts of silicon steel, 10 parts of ceramic particles and 40 parts of acetone.
The production process of the special repairing agent for the boiler flue gas desulfurization tower comprises the following steps:
(1) preparation of the corrosion-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting the fly ash, the carbon fiber, the silicon steel and the ceramic particles into a ball mill for grinding, wherein the rotating speed of the ball mill is 700-1200r/min, and grinding for 1h at the temperature of 20-30 ℃ to obtain a premix A; putting the polyurethane modified epoxy resin, the graphene modified epoxy resin and acetone into a stirrer, and uniformly stirring and mixing to obtain a premix B; slowly adding the premix A into the premix B in batches under the condition of continuous stirring, adding the curing agent after the feeding is finished and uniformly stirred and mixed, and uniformly stirring and mixing again to obtain the corrosion-resistant coating; spraying the corrosion-resistant coating to an area to be repaired on the inner wall of the desulfurization tower, polishing the surface of the area to be repaired before spraying, firstly polishing the surface of the area to be repaired flat by using sand paper or a grinder, then performing surface sand blasting passivation treatment by using full-automatic sand blasting equipment, impacting accelerated abrasive particles to the surface of the area to be repaired, and changing the finish degree and stress state of the surface of the area to be repaired; the full-automatic sand blasting equipment is three-dimensional rotary sand blasting equipment, the distance between a nozzle and the surface of the area to be repaired is 10-15cm, the included angle between the spraying direction and the normal line of the surface of the area to be repaired is 40-45 degrees, the spraying pressure is 0.6-0.7 MPa, and the grain diameter of sand sprayed by the sand blasting equipment is less than 5 mm; the method has the advantages that accelerated abrasive particles are impacted to the surface of the area to be repaired by utilizing a surface sand blasting passivation process, so that a derusting layer, a deburring layer and an oxidation removing layer are achieved, the smoothness and the stress state of the surface of the area to be repaired are changed, compared with manual polishing, the polishing efficiency can be improved, the roughness of the surface of the area to be repaired can be changed by changing the abrasives with different particle sizes, the roughness of the surface of the area to be repaired is uniform and consistent through sand blasting, and the binding force between the surface of the area to be repaired and the corrosion resistant layer is greatly improved. If the distance between the nozzle and the area to be repaired is too large, the length of an injection pipeline needs to be additionally increased, and the pressure loss is overlarge; if the included angle between the spraying direction and the surface normal of the area to be repaired is too small, the spraying area in unit time is reduced, the spraying efficiency is influenced, and if the included angle between the spraying direction and the surface normal of the area to be repaired is too large, the spraying is easy to be uneven; the spraying thickness is 0.3mm, the corrosion-resistant layer is obtained after spraying, and the corrosion-resistant layer is dried at the temperature of 50-60 ℃ for 3-4 h;
(2) preparation of the bonding layer: weighing the raw materials in part by weight, putting vinyl ester resin into a stirring kettle with a heating function, preheating the vinyl ester resin for 2 hours at 70 ℃, adding tetraethylenepentamine into the stirring kettle, stirring and mixing the mixture uniformly, mixing silicon dioxide and expanded perlite to obtain premix C, slowly adding the premix C into the stirring kettle in batches, and stirring and mixing the mixture uniformly after the addition to obtain the combined coating; spraying the bonding coating on the surface of the corrosion-resistant layer to obtain a bonding layer, wherein the spraying thickness is 1 mm;
(3) preparing a wear-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting silicon carbide, zirconia and titanium-tungsten alloy powder into a ball mill for grinding, wherein the rotating speed of the ball mill is 800-1100r/min, and grinding for 1.5h at the temperature of 20-30 ℃ to obtain premix D; putting the vinyl glass flake mucilage and styrene into a stirrer, and uniformly stirring and mixing to obtain a premix E; slowly adding the premix D into the premix E in batches under the state of continuous stirring, stirring and uniformly mixing after the feeding is finished, sequentially adding alumina corundum porcelain balls and modified hollow glass microspheres, and then mixing and stirring to obtain the wear-resistant coating; after the combined coating is sprayed on the surface of the corrosion-resistant layer, immediately spraying the wear-resistant coating on the surface of the combined layer, wherein the spraying thickness is 0.5mm, obtaining the wear-resistant layer after spraying, and drying the wear-resistant layer at the drying temperature of 50-55 ℃ for 1-2 h; the preparation method of the modified hollow glass bead comprises the following steps: and (2) soaking the hollow glass beads with the particle size of 40-70 microns in a silane coupling agent aqueous solution with the volume concentration of 1.8% for 1.5-2h, taking out and drying after soaking to obtain the modified hollow glass beads. After the hollow glass beads are modified, the interface strength of the surfaces of the hollow glass beads can be improved, so that the connection performance between the wear-resistant layer and the bonding layer is improved.
Example 2
The utility model provides a special repairing agent of boiler flue gas desulfurization tower, the repairing agent is multilayer composite coating, includes from the top down and coats wearing layer, anchor coat, corrosion-resistant layer on the desulfurizing tower inner wall in proper order, and corrosion-resistant layer closely laminates with the inner wall of desulfurizing tower, the gross thickness of repairing agent is 2.5mm, and wherein the thickness of wearing layer is 0.6mm, the thickness of anchor coat is 1.5mm, the thickness of corrosion-resistant layer is 0.4 mm.
The wear-resistant layer is prepared from the following raw materials in parts by weight: 40 parts of vinyl glass flake mucilage, 10 parts of alumina corundum porcelain ball, 10 parts of modified hollow glass microsphere, 10 parts of silicon carbide, 10 parts of zirconia, 10 parts of titanium-tungsten alloy powder and 40 parts of styrene.
The bonding layer is prepared from the following raw materials in parts by weight: 40 parts of silicon dioxide with the particle size of 20nm-30nm, 15 parts of expanded perlite, 20 parts of vinyl ester resin and 20 parts of tetraethylenepentamine.
The corrosion-resistant layer is prepared from the following raw materials in parts by weight: 40 parts of polyurethane modified epoxy resin, 40 parts of graphene modified epoxy resin, 4 parts of curing agent triethylene tetramine, 20 parts of fly ash, 15 parts of carbon fiber, 15 parts of silicon steel, 15 parts of ceramic particles and 50 parts of acetone.
The production process of the repairing agent special for the boiler flue gas desulfurization tower is the same as that of the embodiment 1, and details are not repeated herein.
Example 3
The utility model provides a special repairing agent of boiler flue gas desulfurization tower, the repairing agent is multilayer composite coating, includes from the top down and coats wearing layer, anchor coat, corrosion-resistant layer on the desulfurizing tower inner wall in proper order, and corrosion-resistant layer closely laminates with the inner wall of desulfurizing tower, the gross thickness of repairing agent is 2.0mm, and wherein the thickness of wearing layer is 0.5mm, the thickness of anchor coat is 1.1mm, the thickness of corrosion-resistant layer is 0.4 mm.
The wear-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of vinyl glass flake mucilage, 8 parts of alumina corundum porcelain ball, 7 parts of modified hollow glass microsphere, 8 parts of silicon carbide, 7 parts of zirconia, 8 parts of titanium-tungsten alloy powder and 35 parts of styrene.
The bonding layer is prepared from the following raw materials in parts by weight: 35 parts of silicon dioxide with the particle size of 20nm-30nm, 12 parts of expanded perlite, 17 parts of vinyl ester resin and 16 parts of tetraethylenepentamine.
The corrosion-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of polyurethane modified epoxy resin, 30 parts of graphene modified epoxy resin, 4 parts of curing agent diethylaminopropylamine, 15 parts of fly ash, 13 parts of carbon fiber, 13 parts of silicon steel, 13 parts of ceramic particles and 45 parts of acetone.
The production process of the repairing agent special for the boiler flue gas desulfurization tower is the same as that of the embodiment 1, and details are not repeated herein.
Example 4
The utility model provides a special repairing agent of boiler flue gas desulfurization tower, the repairing agent is multilayer composite coating, includes from the top down and coats wearing layer, anchor coat, corrosion-resistant layer on the desulfurizing tower inner wall in proper order, and corrosion-resistant layer closely laminates with the inner wall of desulfurizing tower, the gross thickness of repairing agent is 2.2mm, and wherein the thickness of wearing layer is 0.6mm, the thickness of anchor coat is 1.2mm, the thickness of corrosion-resistant layer is 0.4 mm.
The wear-resistant layer is prepared from the following raw materials in parts by weight: 35 parts of vinyl glass flake mucilage, 9 parts of alumina corundum porcelain ball, 9 parts of modified hollow glass bead, 6 parts of silicon carbide, 8 parts of zirconia, 9 parts of titanium-tungsten alloy powder and 38 parts of styrene.
The bonding layer is prepared from the following raw materials in parts by weight: 32 parts of silicon dioxide with the particle size of 20nm-30nm, 13 parts of expanded perlite, 19 parts of vinyl ester resin and 18 parts of tetraethylenepentamine.
The corrosion-resistant layer is prepared from the following raw materials in parts by weight: 37 parts of polyurethane modified epoxy resin, 33 parts of graphene modified epoxy resin, 3 parts of curing agent tetraethylenepentamine, 12 parts of fly ash, 14 parts of carbon fiber, 12 parts of silicon steel, 11 parts of ceramic particles and 42 parts of acetone.
The production process of the repairing agent special for the boiler flue gas desulfurization tower is the same as that of the embodiment 1, and details are not repeated herein.
Example 5
The utility model provides a special repairing agent of boiler flue gas desulfurization tower, the repairing agent is multilayer composite coating, includes from the top down and coats wearing layer, anchor coat, corrosion-resistant layer on the desulfurizing tower inner wall in proper order, and corrosion-resistant layer closely laminates with the inner wall of desulfurizing tower, the gross thickness of repairing agent is 2.4mm, and wherein the thickness of wearing layer is 0.6mm, the thickness of anchor coat is 1.5mm, the thickness of corrosion-resistant layer is 0.3 mm.
The wear-resistant layer is prepared from the following raw materials in parts by weight: 38 parts of vinyl glass flake mucilage, 6 parts of alumina corundum porcelain ball, 6 parts of modified hollow glass bead, 8 parts of silicon carbide, 7 parts of zirconia, 7 parts of titanium-tungsten alloy powder and 32 parts of styrene.
The bonding layer is prepared from the following raw materials in parts by weight: 33 parts of silicon dioxide with the particle diameter of 20nm-30nm, 14 parts of expanded perlite, 16 parts of vinyl ester resin and 16 parts of tetraethylenepentamine.
The corrosion-resistant layer is prepared from the following raw materials in parts by weight: 32 parts of polyurethane modified epoxy resin, 33 parts of graphene modified epoxy resin, 3 parts of curing agent triethylene tetramine, 14 parts of fly ash, 11 parts of carbon fiber, 11 parts of silicon steel, 14 parts of ceramic particles and 44 parts of acetone.
The production process of the repairing agent special for the boiler flue gas desulfurization tower is the same as that of the embodiment 1, and details are not repeated herein.
The properties of the repairing agent prepared in each of the above examples were tested, and the rubber corrosion-resistant lining with the same thickness as that of example 1 was used as a control group 1, and the polyester flake daub corrosion-resistant lining sprayed with the same thickness as that of example 1 was used as a control group 2, and the experimental results were as follows:
TABLE 1 results of comparative experiments on compressive strength, tensile strength and shear strength of each example and a control group
As can be seen from Table 1, the repairing agent provided by the invention has good toughness, high strength, resistance to erosion and abrasion of a medium, and good impact resistance and erosion resistance.
TABLE 2 comparative experiment results of acid and alkali resistance of each example and the control group
As can be seen from Table 2, the acid and alkali corrosion resistance of the repairing agent of the present invention is significantly better than the corrosion resistance of the lining layer in the prior art.
Table 3 results of experiments comparing the frictional wear performance of each example with that of a control group:
the abrasion test was carried out using a fixed abrasive abrasion tester ML-10 (test conditions: abrasion test dimensions)5mmx15mm, wherein the abrasive material is 250 meshes of waterproof abrasive paper, the sample is worn on an ML-10 fixed abrasive particle wear test machine in 6 strokes, one stroke is 40mm, and the load is 1.5KNThen weigh out weight loss as fixed abrasive wear data).
| Group of | Weight loss (g) |
| Example 1 | 0.2198 |
| Example 2 | 0.2174 |
| Example 3 | 0.2188 |
| Example 4 | 0.2211 |
| Example 5 | 0.2199 |
| Control group 1 | 0.7145 |
| Control group 2 | 0.7589 |
As can be seen from Table 3, the repairing agent of the present invention can significantly reduce the amount of frictional wear, maintain the durable wear resistance, and greatly prolong the service life of the desulfurization tower when the surface of the lining layer in the prior art is worn seriously.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The special repairing agent for the boiler flue gas desulfurization tower is characterized in that: the repairing agent is a multilayer composite coating and comprises an abrasion-resistant layer, a bonding layer and a corrosion-resistant layer which are sequentially coated on the inner wall of the desulfurizing tower from top to bottom, the corrosion-resistant layer is tightly attached to the inner wall of the desulfurizing tower, the total thickness of the repairing agent is 1.8 mm-2.5 mm, the thickness of the abrasion-resistant layer is 0.5 mm-0.6 mm, the thickness of the bonding layer is 1 mm-1.5 mm, and the thickness of the corrosion-resistant layer is 0.3 mm-0.4 mm.
2. The special repairing agent for the boiler flue gas desulfurization tower according to claim 1, characterized in that: the wear-resistant layer is prepared from the following raw materials in parts by weight: 20-40 parts of vinyl glass flake mucilage, 5-10 parts of alumina corundum porcelain ball, 5-10 parts of modified hollow glass microsphere, 5-10 parts of silicon carbide, 5-10 parts of zirconia, 5-10 parts of titanium-tungsten alloy powder and 30-40 parts of styrene.
3. The special repairing agent for the boiler flue gas desulfurization tower according to claim 2, characterized in that: the wear-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of vinyl glass flake mucilage, 8 parts of alumina corundum porcelain ball, 7 parts of modified hollow glass microsphere, 8 parts of silicon carbide, 7 parts of zirconia, 8 parts of titanium-tungsten alloy powder and 35 parts of styrene.
4. The special repairing agent for the boiler flue gas desulfurization tower according to claim 1, characterized in that: the bonding layer is prepared from the following raw materials in parts by weight: 30-40 parts of silicon dioxide with the particle size of 20-30 nm, 10-15 parts of expanded perlite, 15-20 parts of vinyl ester resin and 15-20 parts of tetraethylenepentamine.
5. The special repairing agent for the boiler flue gas desulfurization tower according to claim 1, characterized in that: the corrosion-resistant layer is prepared from the following raw materials in parts by weight: 20-40 parts of polyurethane modified epoxy resin, 20-40 parts of graphene modified epoxy resin, 3-4 parts of curing agent, 10-20 parts of fly ash, 10-15 parts of carbon fiber, 10-15 parts of silicon steel, 10-15 parts of ceramic particles and 40-50 parts of acetone.
6. The special repairing agent for the boiler flue gas desulfurization tower according to claim 5, characterized in that: the corrosion-resistant layer is prepared from the following raw materials in parts by weight: 30 parts of polyurethane modified epoxy resin, 30 parts of graphene modified epoxy resin, 4 parts of curing agent, 15 parts of fly ash, 13 parts of carbon fiber, 13 parts of silicon steel, 13 parts of ceramic particles and 45 parts of acetone.
7. The special repairing agent for the boiler flue gas desulfurization tower according to claim 5, characterized in that: the curing agent is any one of diethylenetriamine, triethylene tetramine, diethylaminopropylamine and tetraethylenepentamine.
8. The production process of the special repairing agent for the boiler flue gas desulfurization tower according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
(1) preparation of the corrosion-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting the fly ash, the carbon fiber, the silicon steel and the ceramic particles into a ball mill for grinding, wherein the rotating speed of the ball mill is 700-1200r/min, and grinding for 1h at the temperature of 20-30 ℃ to obtain a premix A; putting the polyurethane modified epoxy resin, the graphene modified epoxy resin and acetone into a stirrer, and uniformly stirring and mixing to obtain a premix B; slowly adding the premix A into the premix B in batches under the condition of continuous stirring, adding the curing agent after the feeding is finished and uniformly stirred and mixed, and uniformly stirring and mixing again to obtain the corrosion-resistant coating; spraying the corrosion-resistant coating to an area to be repaired on the inner wall of the desulfurization tower, polishing the surface of the area to be repaired before spraying, wherein the spraying thickness is 0.3-0.4 mm, obtaining a corrosion-resistant layer after spraying, and drying the corrosion-resistant layer at the drying temperature of 50-60 ℃ for 3-4 h;
(2) preparation of the bonding layer: weighing the raw materials in part by weight, putting vinyl ester resin into a stirring kettle with a heating function, preheating the vinyl ester resin for 2 hours at 70 ℃, adding tetraethylenepentamine into the stirring kettle, stirring and mixing the mixture uniformly, mixing silicon dioxide and expanded perlite to obtain premix C, slowly adding the premix C into the stirring kettle in batches, and stirring and mixing the mixture uniformly after the addition to obtain the combined coating; spraying the bonding coating on the surface of the corrosion-resistant layer to obtain a bonding layer, wherein the spraying thickness is 1 mm-1.5 mm;
(3) preparing a wear-resistant layer: weighing the raw materials in sequence according to the weight part ratio, putting silicon carbide, zirconia and titanium-tungsten alloy powder into a ball mill for grinding, wherein the rotating speed of the ball mill is 800-1100r/min, and grinding for 1.5h at the temperature of 20-30 ℃ to obtain premix D; putting the vinyl glass flake mucilage and styrene into a stirrer, and uniformly stirring and mixing to obtain a premix E; slowly adding the premix D into the premix E in batches under the state of continuous stirring, stirring and uniformly mixing after the feeding is finished, sequentially adding alumina corundum porcelain balls and modified hollow glass microspheres, and then mixing and stirring to obtain the wear-resistant coating; and after the combined coating is sprayed on the surface of the corrosion-resistant layer, immediately spraying the wear-resistant coating on the surface of the combined layer, wherein the spraying thickness is 0.5-0.6 mm, obtaining the wear-resistant layer after spraying, drying the wear-resistant layer at the drying temperature of 50-55 ℃ for 1-2 h.
9. The production process of the special repairing agent for the boiler flue gas desulfurization tower according to claim 8, characterized in that:
the preparation method of the modified hollow glass beads in the step (3) comprises the following steps: and (2) soaking the hollow glass beads with the particle size of 40-70 microns in a silane coupling agent aqueous solution with the volume concentration of 1.8% for 1.5-2h, taking out and drying after soaking to obtain the modified hollow glass beads.
10. The special repair for the boiler flue gas desulfurization tower of claim 8The production process of the agent is characterized in that: when the surface of the area to be repaired is polished in the step (1), firstly, polishing and flattening the surface of the area to be repaired by using sand paper or a grinding machine, then, carrying out surface sand blasting passivation treatment by using full-automatic sand blasting equipment, and impacting accelerated abrasive particles on the surface of the area to be repaired to change the finish degree and stress state of the surface of the area to be repaired; the full-automatic sand blasting equipment is three-dimensional rotary sand blasting equipment, the distance between a nozzle and the surface of the area to be repaired is 10-15cm, and the included angle between the spraying direction and the normal line of the surface of the area to be repaired is 40o~45oThe spraying pressure is 0.6 MPa-0.7 MPa, and the grain diameter of sand sprayed by sand blasting equipment is less than 5 mm.
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| CN114524617A (en) * | 2022-03-31 | 2022-05-24 | 郑州圣莱特空心微珠新材料有限公司 | Silicon carbide modified high-thermal-conductivity low-dielectric hollow glass bead and preparation method thereof |
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| CN114524617A (en) * | 2022-03-31 | 2022-05-24 | 郑州圣莱特空心微珠新材料有限公司 | Silicon carbide modified high-thermal-conductivity low-dielectric hollow glass bead and preparation method thereof |
| CN114524617B (en) * | 2022-03-31 | 2023-11-28 | 郑州圣莱特空心微珠新材料有限公司 | Silicon carbide modified hollow glass microsphere with high heat conductivity and low dielectric property and preparation method thereof |
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| CN113908931B (en) | 2023-01-13 |
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