CN108486946B - Integral hot steam dryer and system applied to waste heat utilization thereof - Google Patents
Integral hot steam dryer and system applied to waste heat utilization thereof Download PDFInfo
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- CN108486946B CN108486946B CN201810457546.8A CN201810457546A CN108486946B CN 108486946 B CN108486946 B CN 108486946B CN 201810457546 A CN201810457546 A CN 201810457546A CN 108486946 B CN108486946 B CN 108486946B
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- 239000002918 waste heat Substances 0.000 title abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 61
- 230000005540 biological transmission Effects 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 6
- 238000004043 dyeing Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000004745 nonwoven fabric Substances 0.000 abstract description 3
- 238000007639 printing Methods 0.000 abstract description 3
- 239000004753 textile Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 230000000149 penetrating effect Effects 0.000 description 9
- 239000000047 product Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000007602 hot air drying Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/022—Heating the cylinders
- D21F5/028—Heating the cylinders using steam
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B15/00—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/021—Construction of the cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/20—Waste heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Textile Engineering (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses an integral type hot steam drying cylinder and application thereof to a waste heat utilization system, and belongs to the technical field of drying of papermaking, textile, printing and dyeing and non-woven fabrics. The integral type hot gas dryer specifically comprises a dryer body, three sleeves and a guide plate; the three sleeves consist of an outer sleeve, a middle sleeve and a core tube; one end of the three sleeves extends into the cylinder body, and the other end of the three sleeves is arranged outside the cylinder body; one end of the core tube extends downwards to the bottom of the cylinder body at the middle part of the cylinder body; the outer sleeve, the middle sleeve and the core tube outside the cylinder body are respectively provided with an outer sleeve external interface, a middle sleeve external interface and a condensate discharge port. The dryer can be divided into two different cases with the upper half as the main working surface and the lower half as the main working surface, and for this purpose, the hot steam inlet and the steam outlet are arranged with correspondingly different schemes. The integral hot steam drying cylinder is a non-pressure container and has the advantages of exquisite structure, low cost, high heat energy utilization rate and the like. The waste heat of the high-temperature, high-humidity and high-latent-heat micro-pressure hot steam is used as a heat source, so that the waste heat utilization of the high-temperature, high-humidity and high-latent-heat micro-pressure hot steam is possible, and the energy-saving effect is very obvious.
Description
Technical Field
The invention relates to an integral type hot steam drying cylinder, and also relates to a system for utilizing waste heat of the integral type hot steam drying cylinder, belonging to the technical field of drying of papermaking, spinning, printing and dyeing and non-woven fabrics.
Background
The dryer is a key component used for drying products in the drying operation of paper making, textile, printing and dyeing and non-woven fabrics, and is used for drying moisture in the products and finishing paper surfaces. At present, a steam drying cylinder is basically adopted in the market, and is a pressure container and controlled by the pressure container. The rotary joint of the steam dryer only needs to consider the inlet of steam and the outlet of condensed water. After the steam is sent into the drying cylinder, the steam is uniformly mixed with the original steam in the drying cylinder to work together, and no special structure exists. Condensed water is mainly concentrated at the bottom of the drying cylinder, and is discharged outside the drying cylinder through a rotary joint by using a siphon pipe and the pressure of internal steam. Even if condensate forms a water ring at high rotational speeds, there are mature techniques to reject condensate. The steam drying cylinder has only a water discharging function and has no steam (gas) discharging function, so that the heat energy utilization rate of the steam drying cylinder is not high, the utilization of high-temperature, high-humidity and high-latent heat micro-pressure waste heat steam is limited, the wall thickness and the weight of the steam drying cylinder are large, the heat transfer is slow, and the manufacturing cost is high.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides an integral hot steam drying cylinder which has the characteristics of high efficiency, full utilization of high temperature, high humidity and high latent heat micro-pressure waste steam while reducing cost.
In order to solve the technical problems, the invention provides an integral hot steam drying cylinder which is of a round roller heating body structure and is characterized by comprising a cylindrical cylinder body, three sleeves and a guide plate, wherein two ends of the cylindrical cylinder body are fixedly connected with cylinder body end covers respectively;
one end of the three sleeves extends into the cylinder body from one side of the cylinder body, and the other end of the three sleeves is arranged outside the cylinder body; the three sleeves consist of an outer sleeve, a middle sleeve and a core tube; one end of the core tube extends downwards to the bottom of the cylinder body at the middle part of the cylinder body; the outer sleeve, the middle sleeve and the core tube which are positioned at the outer part of the cylinder body are respectively provided with an outer sleeve external interface, a middle sleeve external interface and a condensate discharge port;
the tubular transmission shaft is arranged on the periphery of the outer sleeve outside the cylinder body, one end of the tubular transmission shaft is fixedly connected with the end cover of the cylinder body close to the tubular transmission shaft, the transmission gear is arranged at the other end of the tubular transmission shaft, and a bearing is arranged between the end cover and the transmission gear; the tubular transmission shaft is in sliding sealing connection with the outer sleeve 2 outside the cylinder body through a rotary joint; end cover bearings are respectively arranged on the inner sides of the two cylinder body end covers; the outer side of the end cover of the cylinder body far away from one end of the steam inlet is provided with a shaft head and a bearing according to a general mechanical structure, and the end cover and the cylinder body are driven by a tubular transmission shaft to rotate;
the guide plates are four plates and are in a flat plate shape, one ends of the two plates are fixed above the part of the outer sleeve in the cylinder body, the other ends of the two plates extend to a length which is 1% -5% of the diameter of the whole cylinder body from the inner surface of the cylinder body, and an outer sleeve steam inlet is formed in the surface of the outer sleeve between the two outer sleeve guide plates; the lower part of the middle sleeve in the cylinder body is provided with another two middle sleeve guide plates, and a middle sleeve steam through hole is arranged on the surface of the middle sleeve between the middle sleeve guide plates. The distance between the two guide plates and one end of the cylinder body is 2-5 times of the distance between the guide plates and the inner surface of the cylinder body; the outer sleeve and the middle sleeve in the cylinder body are communicated with the cylinder body through the air-through holes on the surface of the guide plate and the sleeve.
The outer sleeve steam through holes are a row of small holes or long slits.
The middle sleeve gas-passing holes are a row of small holes or long slits.
The ratio of the total area of the small holes or the long slits of the steam through holes to the channel area of the outer sleeve is 20-100%.
The ratio of the total area of the small holes or the long slits of the steam through holes to the channel area of the middle sleeve is 20-100%.
The distance from the core tube to the bottom of the inner surface of the cylinder body is smaller than the distance from the middle sleeve guide plate 5 to the inner surface of the cylinder body.
The inner side of the cylinder body is provided with grooves or cooling fins.
And an insulating layer is arranged on the outer side of the cylinder body end cover.
The cylinder body is internally provided with two semi-arc-shaped guide plates, the arc-shaped guide plates and the cylinder body are coaxial, one end of each arc-shaped guide plate is connected with the outer tube sleeve guide plate, and the other end of each arc-shaped guide plate is connected with the middle tube sleeve guide plate.
The two ends of the arc-shaped guide plate are sealed by inner sealing plates, and the inner sealing plates are simultaneously connected with the guide plate in a sealing way.
When the dryer or the Yankee dryer arranged as the upper layer is used, hot steam is connected into external hot steam from a steam inlet (an external interface of the outer sleeve) and introduced into the outer sleeve in the dryer, enters into the dryer through a steam through hole in the outer sleeve, and moves upwards to reach the inner wall of the dryer under the guidance of an outer sleeve guide plate. Under the flow guide of the arc-shaped guide plate concentric with the cylinder body, the heat steam is uniformly distributed in the whole range and the whole circumference heating range in the cylinder body, so that the heat is uniformly transmitted to the inner wall of the hot steam drying cylinder and is transmitted to the product to be dried outside the cylinder body by the cylinder body. After heat conduction is completed, most of steam is condensed to become condensed water, the condensed water is accumulated at the bottom of the cylinder body, or forms a water ring to be adsorbed at the inner side of the cylinder body, and at the moment, the condensed water enters the core pipe under the power action of a volumetric pump outside the cylinder body and is discharged from a condensed liquid discharge port; the hot steam after temperature reduction contains water vapor which is cooled but not condensed and cooled air, and the mixed steam is used as exhaust steam, moves upwards under the guidance of a middle sleeve guide plate, enters the middle sleeve through a steam through hole on the middle sleeve and finally is discharged out of the cylinder from a steam discharge port (a middle sleeve external port).
When the dryer is used as a dryer arranged at the lower layer, hot steam is connected into external hot steam from a steam inlet (an external interface of the middle sleeve), is led into the middle sleeve in the dryer, enters into the dryer through a steam through hole in the middle sleeve, and moves downwards to reach the inner wall of the dryer under the guidance of a guide plate of the middle sleeve. Under the flow guide of the arc-shaped guide plate concentric with the cylinder body, the heat steam is uniformly distributed in the whole range and the whole circumference heating range in the cylinder body, so that the heat is uniformly transmitted to the inner wall of the hot steam drying cylinder and is transmitted to the product to be dried outside the cylinder body by the cylinder body. After heat conduction is completed, most of steam is condensed to become condensed water, the condensed water is accumulated at the bottom of the cylinder body, or forms a water ring to be adsorbed at the inner side of the cylinder body, and at the moment, the condensed water enters the core pipe under the power action of a volumetric pump outside the cylinder body and is discharged from a condensed liquid discharge port; the hot steam after temperature reduction contains water vapor which is cooled but not condensed and cooled air, and the mixed steam is used as 'exhaust steam', moves downwards under the guidance of an outer sleeve guide plate, enters the outer sleeve through a steam through hole on the outer sleeve and finally is exhausted out of the cylinder from a steam exhaust port (an outer sleeve external port).
The access direction of the steam inlet and the steam outlet is determined according to the field arrangement.
The integrated hot steam drying cylinder is applied to a combined system for utilizing the hot air penetrating drying waste heat, and comprises an integrated hot steam drying cylinder, a hot air penetrating dryer and a heat exchanger, wherein the waste heat of hot steam (comprising hot steam and air) generated by the hot air penetrating dryer is conveyed into the hot steam drying cylinder for recycling.
The integral hot steam drying cylinder is applied to a drying cylinder self-circulation drying system and comprises an integral hot steam drying cylinder, a first heat exchanger, a second heat exchanger, a first fan, a second fan and a heating gas hood; the external heat source heats hot steam (air at the beginning) extracted by the first fan through the first heat exchanger, the obtained heated hot steam is sent into the integral hot steam drying cylinder, and the integral hot steam drying cylinder dries materials; the hot air from the exhaust port of the integral hot air dryer is sent into the second heat exchanger for heating the air sent by the second fan of the cup, dry hot air is formed and sent into the heating air hood for carrying out enhanced drying on the materials, and the generated steam and the steam generated by the drying materials of the integral hot air dryer are collected by the heating air hood together with the hot air, and then circulated through the first fan and then enter the first heat exchanger, thus being circulated.
The beneficial effects are that: the integral type hot steam drying cylinder is a non-pressure container (a common steam drying cylinder is a pressure container), and has the advantages of exquisite structure, low manufacturing cost, high heat energy utilization rate and the like; the waste heat of the high-temperature, high-humidity and high-latent-heat micro-pressure hot steam is used as a heat source, so that the waste heat utilization of the high-temperature, high-humidity and high-latent-heat micro-pressure hot steam is possible, and the energy-saving effect is very obvious.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an axial schematic view of the present invention;
FIG. 3 is an enlarged schematic view of section A of the present invention;
FIG. 4 is a schematic view of a simple integral hot gas dryer of the present invention;
in fig. 1,2,3, 4: 1-cylinder, 2-three sleeves, 21-outer sleeve, 211-outer sleeve external interface, 22-middle sleeve, 221-middle sleeve external interface, 23-core tube, 231-condensate outlet, 4-outer sleeve guide plate, 5-middle sleeve guide plate, 6-outer sleeve steam vent, 7-middle sleeve steam vent, 8-tubular transmission shaft, 9-rotary joint, 10-cylinder end cover, 11-end cover bearing, 12-operation side shaft head, 13-bearing, 14-retainer ring, 15-transmission gear, 16-arc guide plate and 17-inner seal plate;
FIG. 5 is a schematic diagram of the process architecture of the integrated hot air dryer of the present invention applied to a through-air drying waste heat utilization combination system;
in fig. 5: 1-an integral hot steam drying cylinder, 2-a hot air penetrating dryer, 3-a heat exchanger, 4-a booster fan, 5-a drying cylinder hood and 6-a hood exhaust fan;
FIG. 6 is a schematic diagram of the present invention integral hot-air dryer applied to a monocylinder self-circulating drying system;
FIG. 7 is a schematic diagram of the integrated hot-air dryer of the present invention applied to a multi-dryer self-circulation drying system;
in fig. 6, 7: 1-a hot steam drying cylinder, 2-a first heat exchanger, 3-a second heat exchanger, 4-a first fan and 5-a second fan;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, wherein the technology or product not specified in the examples is conventional in the art or available commercially.
Example 1: as shown in fig. 1-3, the integral hot steam dryer comprises a cylinder body 1, three sleeves 2 and a guide plate. The three-sleeve 2 consists of an outer sleeve 21, a middle sleeve 22 and a core tube 23. One end of the three sleeves 2 extends into the cylinder body 1 from one side of the cylinder body 1, and the other end is arranged outside the cylinder body 1. One end of the core tube 23 extends downward to the bottom of the cylinder 1 at the middle of the cylinder 1. The outer sleeve 21, the middle sleeve 22 and the core tube 23 which are arranged outside the cylinder body 1 are respectively provided with an outer sleeve external interface 211, a middle sleeve external interface 221 and a condensate discharge outlet 231. The tubular transmission shaft 8 is arranged on the periphery of an outer sleeve 21 outside the cylinder body 1, one end of the tubular transmission shaft is connected with a cylinder body end cover 10 which is close to the tubular transmission shaft, the other end of the tubular transmission shaft is provided with a transmission gear 15, and the middle of the tubular transmission shaft is provided with a bearing 13. The tubular transmission shaft 8 is in sliding sealing connection with an outer sleeve 21 outside the cylinder body 1 through a rotary joint 9. The inner sides of the two cylinder end covers 10 are respectively provided with an end cover bearing 11, so that the outer sleeve 21 and the end cover 10 are matched to move, namely, the end cover 10 rotates relative to the outer sleeve 21. An operation side shaft head 12 is fixedly arranged on the outer side of the cylinder end cover 10 far away from one end of the steam inlet 211, a bearing 13 is arranged on the operation side shaft head 12, and a check ring 14 is arranged between the operation side shaft head 12 and the end cover bearing 11. Two flat outer sleeve guide plates 4 are arranged above the outer sleeve 21 in the cylinder body 1, and two ends of the flat outer sleeve guide plates are connected with the inner sealing plate 17. The two outer sleeve guide plates 4 extend to a position which is 1% of the length of the whole cylinder diameter from the inner surface of the cylinder, and outer sleeve steam through holes 6 are arranged on the surface of the outer sleeve 21 between the outer sleeve guide plates 4. The distance between the two outer sleeve guide plates 4 and one end of the cylinder body is 2 times of the distance between the two outer sleeve guide plates and the inner surface of the cylinder body. Two flat middle sleeve guide plates 5 are arranged below the middle sleeve 22 in the cylinder body, two ends of the two flat middle sleeve guide plates are connected with the inner sealing plate 17, the two middle sleeve guide plates 5 extend to a position which is 1% of the length of the whole cylinder body diameter from the inner surface of the cylinder body, and middle sleeve steam through holes 7 are formed in the surface of the middle sleeve 22 between the middle sleeve guide plates 5. The distance between the two middle sleeve guide plates 5 and one end of the cylinder body is 2 times of the distance between the two middle sleeve guide plates and the inner surface of the cylinder body. The outer sleeve 21 and the middle sleeve 22 in the cylinder body 1 are communicated with the cylinder body 1 through the steam through holes on the surfaces of the guide plates and the sleeves.
The steam through holes 6 and 7 are a row of small holes with equal intervals, so that hot steam can be uniformly diffused into the inner wall of the drying cylinder or uniformly received into the cooled exhaust steam to enter the exhaust steam pipe and be discharged out of the drying cylinder.
In other embodiments, the steam through holes 6 and 7 may be any openings with any shape, for example, a long slit with equal width, which can uniformly diffuse the hot steam.
The ratio of the total area of the small holes or the long slits to the corresponding channel area of the pipeline is 20-100%.
The distance from the core tube 23 to the bottom of the inner surface of the cylinder body is smaller than the distance from the middle sleeve guide plate 5 to the inner surface of the cylinder body, so that condensate is conveniently discharged, and meanwhile, the steam guide of the middle sleeve guide plate 5 is ensured not to be blocked due to flooding.
As shown in fig. 3, the inner side of the cylinder 1 is provided with grooves to enlarge the heat transfer area and improve the heat transfer efficiency.
In other embodiments, other shaped structures are provided inside the cylinder 1 to act as an increased heat transfer area, such as fin structures.
The outside of the cylinder end cover 10 is provided with an insulating layer, so that unnecessary heat dissipation is reduced.
The cylinder body 1 is internally provided with two semi-arc-shaped guide plates 16, the arc-shaped guide plates 16 and the cylinder body 1 are coaxial, one end of each arc-shaped guide plate is connected with the outer pipe sleeve guide plate, and the other end of each arc-shaped guide plate is connected with the middle pipe sleeve guide plate. Because the arc-shaped guide plates are connected with the four guide plates, the gap distance between the surface of the arc-shaped guide plates and the inner surface of the cylinder body is also 1% of the length of the diameter of the whole cylinder body.
The two ends of the arc-shaped guide plate 16 are sealed by the inner sealing plates 17, on one hand, the arc-shaped guide plate is fixed, and meanwhile, the hot steam can be prevented from entering the cylinder from two sides and cannot be guided correctly. A certain gap is reserved between the inner sealing plate 17 and the cylinder end cover 10, and the specific gap is that the arrangement of the bearing 11 is not affected, and part of hot steam enters the gap and radiates heat outwards through the cylinder end cover.
The access directions of the steam inlet and exhaust external interfaces 211 and 221 are determined according to the field arrangement.
When the integral hot steam dryer is used as a dryer or a Yankee dryer arranged on the upper layer, the outer sleeve outer port 211 is used as a steam inlet, and the outer port 221 of the middle sleeve is used as a steam outlet. The hot air is introduced into the external air from the external sleeve interface 211 and introduced into the external sleeve in the cylinder body, enters the cylinder body through the external sleeve air-passing hole 6, and moves upwards to reach the inner wall of the cylinder body under the guidance of the external sleeve guide plate 4. The heat steam is evenly distributed in the whole width and the whole circumference heating range in the cylinder body under the guide flow of the arc-shaped guide plate 16 concentric with the cylinder body, so that the heat is evenly transmitted to the inner wall of the cylinder body 1 of the heat steam drying cylinder, and the heat is transmitted to the product to be dried outside the cylinder body 1 by the cylinder body 1. After heat conduction is completed, most of steam is condensed to become condensed water and is accumulated at the bottom of the cylinder body, or forms a water ring to be adsorbed at the inner side of the cylinder body, at the moment, the condensed water enters the core pipe 23 under the power action of a volumetric pump outside the cylinder body and is discharged from the condensed liquid discharge port 231; the hot steam after temperature drop contains water vapor which is cooled but not condensed and cooled air, and the mixed steam is used as exhaust steam and moves upwards under the guidance of the middle sleeve guide plate 5, enters the middle sleeve through the middle sleeve steam through holes 7 and finally is discharged out of the cylinder from the middle sleeve external interface 221.
The patent has the advantages of simple equipment, small investment, high thermal efficiency and the like. The waste heat utilization of the high-temperature, high-humidity and high-latent heat micro-pressure hot steam is possible.
Example 2: as shown in fig. 1-3, the integral hot gas dryer structure is as described in example 1. When the integral hot steam drying cylinder is used as a drying cylinder arranged at the lower layer, the outer interface 221 of the middle sleeve is used as a steam inlet, and the outer interface 211 of the outer sleeve is used as a steam outlet. The hot air is connected with the external interface 221 from the external middle sleeve pipe, is led into the external sleeve pipe in the cylinder body, enters the cylinder body through the middle sleeve pipe air-through hole 7, and moves downwards to reach the inner wall of the cylinder body under the guidance of the middle sleeve pipe guide plate 5. The heat steam is evenly distributed in the whole width and the whole circumference heating range in the cylinder body under the guide flow of the arc-shaped guide plate 16 concentric with the cylinder body, so that the heat is evenly transmitted to the inner wall of the cylinder body 1 of the heat steam drying cylinder, and the heat is transmitted to the product to be dried outside the cylinder body 1 by the cylinder body 1. After heat conduction is completed, most of steam is condensed to become condensed water and is accumulated at the bottom of the cylinder body, or forms a water ring to be adsorbed at the inner side of the cylinder body, at the moment, the condensed water enters the core pipe 23 under the power action of a volumetric pump outside the cylinder body and is discharged from the condensed liquid discharge port 231; the hot steam after temperature reduction contains water vapor which is cooled but not condensed and cooled air, and the mixed steam is used as exhaust steam, moves downwards under the guidance of the outer sleeve guide plate 4, enters the outer sleeve through the outer sleeve steam through holes 6 and finally is discharged out of the cylinder from the outer sleeve external connector 211.
Example 3: the integral hot air dryer construction is as described in example 1, with reference to figures 1-3. In particular use, in order to reduce the flow velocity of the hot steam along the arcuate baffle, the clearance distance of the arcuate baffle surface from the cylinder inner surface may be suitably increased to a length of 5% of the overall cylinder diameter. Correspondingly, the outer sleeve guide plate 4 extends to a position which is 5% of the length of the whole cylinder diameter from the inner surface of the cylinder, and the middle sleeve guide plate 5 extends to a position which is 5% of the length of the whole cylinder diameter from the inner surface of the cylinder; the distance between one end of the two outer sleeve guide plates 4 close to the cylinder body is 5 times of the distance between the two outer sleeve guide plates and the inner surface of the cylinder body, and the distance between one end of the two middle sleeve guide plates 5 close to the cylinder body is 5 times of the distance between the two middle sleeve guide plates and the inner surface of the cylinder body.
Example 4: in a roll heating application with low temperature uniformity and size, a simple integral hot gas dryer configuration may be used, as shown in fig. 4, with the particular configuration being the same as that described in example 1 except for the arcuate baffle 16 and side closure plates 17 as described in example 1.
Example 5: as shown in fig. 5, the combined system for utilizing the residual heat of the hot air through drying of the integral hot air and hot air drying cylinder comprises the integral hot air and hot air drying cylinder 1, a hot air through dryer 2 and a heat exchanger 3, wherein the residual heat of the hot air (comprising hot steam and air) generated by the hot air through dryer 2 is conveyed into the hot air drying cylinder 1 for recycling; the specific process is that an external heat source heats air through a heat exchanger 3 to form hot air, the hot air is sent into a hot air penetrating dryer 2 to carry out hot air penetrating drying on a wet paper web, hot steam (comprising hot steam and air) generated by the hot air penetrating drying is sent into an integral hot steam drying cylinder 1 through a booster fan 4, the wet paper web subjected to the hot air penetrating drying is further subjected to heat treatment through the integral hot steam drying cylinder 1, and at the moment, low-grade hot steam generated by the hot air penetrating drying is collected by a drying cylinder hood 5 and finally discharged through a hood exhaust fan 6. The fan 4 is added to be a high-temperature centrifugal fan, and the air hood exhaust fan is provided with a temperature-resistant axial flow fan
In another embodiment, the web may be heat treated by passing it through the hot air dryer 1 and then through the through-air dryer 2, depending on the process requirements for the heat treatment of the paper.
Example 6: as shown in fig. 6, the single-cylinder self-circulation drying system comprises an integral hot steam cylinder 1, a first heat exchanger 2, a second heat exchanger 3, a first fan 4, a second fan 5 and a heating hood 6; the external heat source heats hot steam (air at the beginning) extracted by a first fan 4 through a first heat exchanger 2, the obtained heated hot steam is sent into an integral hot steam dryer 1, and the integral hot steam dryer 1 dries materials; the hot air from the exhaust port of the integral hot air dryer 1 is sent into the second heat exchanger 3 for heating the air sent by the second fan 5 of the cup, the hot air is formed and sent into the heating air hood 6 for carrying out enhanced drying on the materials, the generated steam and the steam generated by the drying materials of the integral hot air dryer 1 are collected by the heating air hood 6 together with the hot air and then are circulated into the first heat exchanger 2 through the first fan 4, and the circulation is carried out, so that the wet paper sheet mainly consumes energy only in the heating and temperature rising process of the hot air exhausted by the hot air hood in the continuous drying process, the specific heat volume of the hot air is very small, and the specific heat volume of the dry air is only 1.013 KJ/Kg. 0 C, the specific heat capacity of the water vapor is only 2.0934 KJ/Kg 0 C. And 100. Ang. Of o The evaporation energy consumption of C water is 2256.6 KJ/Kg,20 o C water is heated to 100 o The energy consumption of C is 334.944 KJ/Kg, and the energy-saving effect is obvious. The drying system only needs to supplement the heat efficiency loss of the whole system except for supplementing a small amount of heat steam to raise the temperature. The first fan 4 and the second fan 5 are selected from high-temperature-resistant variable-frequency centrifugal windAnd (5) a machine. When in operation, the air quantity of the first fan 4 and the second fan 5 needs to be controlled so as to keep the air pressure inside and outside the heating steam hood 6 to be 0, and the outside cold air is not allowed to enter the heating steam hood, and the hot air in the heating steam hood is not allowed to dissipate outside the system.
In another embodiment, more than two of the single-cylinder circulation systems of embodiment 6 are used in combination to form a multi-cylinder self-circulation drying system, as shown in fig. 7, which is a 12-unit hot-steam-cylinder combined multi-cylinder self-circulation drying system, wherein two cylinders are connected in parallel to form a set of self-circulation system.
While the present invention has been described with reference to the drawings, the scope of the invention is not limited to the above description, and various changes can be made without departing from the spirit and principle of the invention, and any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art are intended to be included in the scope of the present invention.
Claims (12)
1. An integral hot steam drying cylinder is of a round roller heating body structure and is characterized by comprising a cylindrical cylinder body, three sleeves and a guide plate, wherein two ends of the cylindrical cylinder body are fixedly connected with cylinder body end covers respectively;
one end of the three sleeves extends into the cylinder body from one side of the cylinder body, and the other end of the three sleeves is arranged outside the cylinder body; the three sleeves consist of an outer sleeve, a middle sleeve and a core tube; one end of the core tube extends downwards to the bottom of the cylinder body at the middle part of the cylinder body; the outer sleeve, the middle sleeve and the core tube which are positioned at the outer part of the cylinder body are respectively provided with an outer sleeve external interface, a middle sleeve external interface and a condensate discharge port;
the tubular transmission shaft is arranged on the periphery of the outer sleeve outside the cylinder body, one end of the tubular transmission shaft is fixedly connected with the end cover of the cylinder body close to the tubular transmission shaft, the transmission gear is arranged at the other end of the tubular transmission shaft, and a bearing is arranged between the end cover and the transmission gear; the tubular transmission shaft is in sliding sealing connection with an outer sleeve outside the cylinder body through a rotary joint; end cover bearings are respectively arranged on the inner sides of the two cylinder body end covers; the end cover and the cylinder body are driven by the tubular transmission shaft to rotate;
the guide plates are four plates and are in a flat plate shape, one ends of the two plates are fixed above the part of the outer sleeve in the cylinder body, the other ends of the two plates extend to a position which is 1% -5% of the diameter of the whole cylinder body from the inner surface of the cylinder body, and outer sleeve steam through holes are formed in the surface of the outer sleeve between the two outer sleeve guide plates; the lower part of the middle sleeve in the cylinder body is provided with two other middle sleeve guide plates, the surface of the middle sleeve between the middle sleeve guide plates is provided with middle sleeve steam through holes, and the distance between the two middle sleeve guide plates close to one end of the cylinder body is 2-5 times of the distance between the two middle sleeve guide plates and the inner surface of the cylinder body.
2. The integral hot-air dryer as claimed in claim 1, said outer sleeve steam-passing holes being a row of small holes or long slits.
3. The integral hot-air dryer of claim 1, the middle sleeve through-air holes being a row of small holes or long slits.
4. An integral hot-steam dryer as claimed in claim 2, the ratio of the total area of the small holes or long slits of the steam passing holes to the passage area of the outer sleeve being 20-100%.
5. A monolithic hot gas dryer as claimed in claim 3, the ratio of the total area of the small holes or long slits of the gas passing holes to the passage area of the middle sleeve being 20-100%.
6. The integral hot-steam dryer according to claim 1, the core tube extends to a distance from the bottom of the inner surface of the cylinder which is smaller than the distance of the middle sleeve guide plate 5 from the inner surface of the cylinder.
7. An integral hot gas dryer as claimed in claim 1, the inside of the cylinder being provided with grooves or cooling fins.
8. The integral hot-air dryer as claimed in claim 1, wherein an insulation layer is provided on the outside of the cylinder end cover.
9. The integral hot steam dryer according to claim 1, wherein two semi-arc-shaped guide plates are arranged in the cylinder body, the arc-shaped guide plates are coaxial with the cylinder body, one end of each arc-shaped guide plate is connected with the outer pipe sleeve guide plate, and the other end of each arc-shaped guide plate is connected with the middle pipe sleeve guide plate.
10. The integral hot-steam dryer as claimed in claim 9, wherein the two ends of the arc-shaped guide plate are closed by inner sealing plates, and the inner sealing plates are simultaneously connected with the guide plate in a sealing manner.
11. The integral hot-steam dryer of claim 1, the outer sleeve external interface being a steam inlet, the middle sleeve external interface being a steam outlet.
12. The integral hot-steam dryer of claim 1, the middle sleeve external interface being a steam inlet and the outer sleeve external interface being a steam outlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810457546.8A CN108486946B (en) | 2018-05-14 | 2018-05-14 | Integral hot steam dryer and system applied to waste heat utilization thereof |
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| CN201810457546.8A CN108486946B (en) | 2018-05-14 | 2018-05-14 | Integral hot steam dryer and system applied to waste heat utilization thereof |
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| CN108486946A CN108486946A (en) | 2018-09-04 |
| CN108486946B true CN108486946B (en) | 2023-06-20 |
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| CN112417364B (en) * | 2020-11-19 | 2024-04-02 | 贵溪发电有限责任公司 | A simple calculation method for partial steam intake of steam turbine unit |
| NL2029388B1 (en) | 2021-10-12 | 2023-05-09 | Tummers Beheer B V | A system and method for discharging evaporated product moisture from a drum dryer |
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