CN106424113A - Thermal desorption system and thermal desorption method for treating mercury-contaminated soil - Google Patents
Thermal desorption system and thermal desorption method for treating mercury-contaminated soil Download PDFInfo
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- CN106424113A CN106424113A CN201611197105.6A CN201611197105A CN106424113A CN 106424113 A CN106424113 A CN 106424113A CN 201611197105 A CN201611197105 A CN 201611197105A CN 106424113 A CN106424113 A CN 106424113A
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- thermal desorption
- unit
- gas
- mixed gas
- contaminated soil
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- 238000003795 desorption Methods 0.000 title claims abstract description 133
- 239000002689 soil Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000007789 gas Substances 0.000 claims abstract description 169
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 136
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 83
- 239000002912 waste gas Substances 0.000 claims abstract description 55
- 239000000428 dust Substances 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- 238000001816 cooling Methods 0.000 claims description 42
- 239000007921 spray Substances 0.000 claims description 42
- 239000002918 waste heat Substances 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract 3
- 239000002245 particle Substances 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 230000001351 cycling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000008246 gaseous mixture Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a thermal desorption system for treating mercury-contaminated soil. The thermal desorption system comprises a feed unit. The mercury-contaminated soil can be conveyed by the feed unit, a thermal desorption unit is connected with the feed unit, and the mercury-contaminated soil can be heated by the thermal desorption unit, so that mercury can be evaporated; a soil inlet and a gas outlet are formed in the thermal desorption unit, the mercury-contaminated soil can be inputted via the soil inlet, mercury-containing mixed gas can be exhausted via the gas outlet, the soil inlet is connected with an outlet end of the feed unit, a mixed gas treatment mechanism is connected with the gas outlet, mercury in the mercury-containing mixed gas can be separated from dust particles by the mixed gas treatment mechanism, and a gas inlet is further formed in the thermal desorption unit and is connected with a gas outlet end of the mixed gas treatment mechanism. The invention further provides a thermal desorption method for treating the mercury-contaminated soil. The thermal desorption method includes waste gas recycling processes and wastewater recycling processes. The thermal desorption system and the thermal desorption method have the advantages of zero waste gas emission and capability of increasing mercury and dust recycling efficiency.
Description
Technical field
The invention belongs to soil sanitation processing technology field, more particularly, to a kind of thermal desorption system processing mercury contaminated soil
And method.
Background technology
Thermal desorption technology is to process one of major technique of high concentration mercury contaminated soil, and it adopts direct or indirect heating
Mode, contaminated soil is heated to uniform temperature and retains a period of time, so that the hydrargyrum in soil is evaporated and separate with soil,
There is the features such as process time is short, treatment effect is high.At present, there are the forms such as rotary kiln, batch kiln both at home and abroad
Thermal desorption equipment is used for the process of mercury contaminated soil, however in the mixed gas discharged through thermal desorption equipment containing more hydrargyrum and
Dust granule needs efficiently to be reclaimed and process, to avoid the pollution of environment to external world.
Chinese invention patent discloses a kind of thermal desorption device for repairing mercury contaminated soil, including feed system, returns
Rotary kiln heating system, dust pelletizing system, cooling condenser system, tail gas filtering system, gas blow-off system, condensate collection system,
Precipitation filtration system, soil cooling system and discharge system.This is used for repairing the thermal desorption device of mercury contaminated soil, can pass through
Light diesel (natural gas) burning indirectly heat rotary kiln body of heater, so that thermal desorption cost is greatly lowered, meanwhile, reduces and was desorbed
The generation of dust in journey, to reduce the disposal pressure to tail gas for the end, additionally, the process tail gas after to dedusting realize dedusting
And condensation, it is finally reached the recovery of hydrargyrum and utilization in tail gas.
But above-mentioned thermal desorption device, on the one hand due to the external world is directly discharged to the waste gas discharged after condensed, with this
Do not enable the cycling and reutilization of waste gas, and then lead to the pollution of the waste gas of the no end removal of mercury completely air to external world；On the other hand,
The output procedure to the mercurous mixed gas that heated volatilization generates for the thermal desorption device, unpowered intervention, so that mercurous mixed
Close gas velocity of liquid assets slower, and then have impact on the organic efficiency to hydrargyrum and dust.
Content of the invention
The present invention is directed to existing thermal desorption technology pollution environment and ineffective technical problem, proposes a kind of energy
Enough realize zero waste gas emission, and can improve the organic efficiency of hydrargyrum and dust the thermal desorption system of process mercury contaminated soil and
Method.
In order to achieve the above object, the technical solution used in the present invention is：
A kind of thermal desorption system processing mercury contaminated soil, including the feed unit that can convey mercury contaminated soil, enters material list
Unit is connected with can heat the thermal desorption unit that mercury contaminated soil makes hydrargyrum evaporate, and thermal desorption unit is provided with and can input mercury contaminated soil
Soil entrance, and the gas outlet of mercurous mixed gas can be discharged, soil entrance is connected with the port of export of feed unit, gas
Body exports the mixed gas processing mechanism of the hydrargyrum being connected with separable mercurous mixed gas and dust granule, and thermal desorption unit is also
It is provided with gas access, gas access is connected with the outlet side of mixed gas processing mechanism.
Preferably, mixed gas processing mechanism includes removing of gas phase in separable mercurous mixed gas and solid matter
Dirt unit, and mercurous mixed gas can be cooled down so that the condensing unit of mercury solution, the inlet end of dust removing units and thermal desorption list
The gas outlet of unit connects, and the outlet side of dust removing units is connected with condensing unit, the outlet side of condensing unit and thermal desorption unit
Gas access connect.
Preferably, be connected between the outlet side of mixed gas processing mechanism and thermal desorption unit gas access to convey
Waste gas to thermal desorption unit tail gas treating unit.
Preferably, tail gas treating unit includes removing the demister of fog in waste gas, the inlet end of demister with mixed
The outlet side closing gas treatment means connects, and the outlet side of demister is connected with the gas access of thermal desorption unit.
Preferably, tail gas treating unit includes the waste gas reheater that can heat waste gas, the inlet end of waste gas reheater with
The outlet side of demister connects, and the outlet side of waste gas reheater is connected with the gas access of thermal desorption unit.
Preferably, waste gas reheater is provided with the fire end that can heat waste gas in waste gas reheater, thermal desorption unit sets
It is equipped with the waste heat outlet of exportable thermal desorption unit waste heat, the waste heat outlet of thermal desorption unit is with the fire end of waste gas reheater even
Connect.
Preferably, condensing unit includes to the spray part of mercurous mixed gas spraying cooling, spraying the inlet end of part
It is connected with the outlet side of dust removing units, the outlet side of spray part is connected with the gas access of thermal desorption unit, spray part is provided with
The water inlet of cooling water can be inputted, and the exportable outlet containing mercury solution, the water inlet of spray part be connected with can provide cold
But the water cooling unit of water, the outlet of spray part is connected with the hydrargyrum water separative element of separable hydrargyrum.
Preferably, the water side of hydrargyrum water separative element is connected with water cooling unit.
A kind of process mercury contaminated soil thermal desorption method it is characterised in that：Comprise the following steps,
S0：Pending mercury contaminated soil is inputted by feed unit and is processed to thermal desorption unit, heat is de-
The heating of coupon unit, so that the mercury vapour in mercury contaminated soil；
S1：The soil isolated through thermal desorption unit is discharged after cooling, the mercurous mixing isolated through thermal desorption unit
Gas inputs to mixed gas processing mechanism, to carry out to the hydrargyrum in mercurous mixed gas and dust separating, to discharge waste gas；
S2：The waste gas discharged from mixed gas processing mechanism is inputted de- to heat by the gas access of thermal desorption unit
In coupon unit, to accelerate the circulation of the mercurous mixed gas of volatilization in thermal desorption unit.
A kind of process mercury contaminated soil thermal desorption method it is characterised in that：Comprise the following steps,
S0：Pending mercury contaminated soil is inputted by feed unit and is processed to thermal desorption unit, heat is de-
The heating of coupon unit, so that the mercury vapour in mercury contaminated soil；
S3：The soil isolated through thermal desorption unit is discharged after cooling, the mercurous mixing isolated through thermal desorption unit
Gas inputs to dust removing units, is separated the dust granule in mercurous mixed gas by dust removing units, meanwhile, after processing
Mercurous mixed gas are discharged from dust removing units；
S4：The mercurous mixed gas discharged from dust removing units are inputted to spray part, to enter to mercurous mixed gas
Row cooling is processed, and meanwhile, makes hydrargyrum cooling liquid, and will contain mercury solution from spray part discharge；
S5：Input discharge from spray part to hydrargyrum water separative element containing mercury solution, to enter to containing the hydrargyrum in mercury solution
Row separates, and the water that will obtain after processing is from the discharge of hydrargyrum water separative element；
S6：The water discharged from hydrargyrum water separative element is inputted to water cooling unit, so that cooling treatment is carried out to water, and will
Cooling water after cooling treatment is discharged from water cooling unit；
S7：The cooling water discharged from water cooling unit is inputted to spray part, with to the mercurous gaseous mixture in spray part
Body carries out cooling treatment.
Compared with prior art, advantages of the present invention and good effect are：
1st, the thermal desorption system of present invention process mercury contaminated soil is passed through the gas access of thermal desorption unit and gaseous mixture
The outlet side of body processing mechanism connects, and, utilizes so that the waste gas that mixed gas processing mechanism produces obtains cycling and reutilization, meanwhile
Waste gas purges to the mercurous mixed gas of volatilization in thermal desorption unit, thus accelerating the flowing of mercurous mixed gas, enters
And achieve the zero-emission of waste gas, and reduce the amount processing activated carbon needed for waste gas, meanwhile, improve whole thermal desorption dress
Put the organic efficiency to hydrargyrum and dust.
2nd, the present invention processes the thermal desorption system of mercury contaminated soil by setting spray part, hydrargyrum water separative element and water cooling
Unit, and hydrargyrum water separative element and water cooling unit are connected, so that the waste water through the output of hydrargyrum water separative element is circulated
Recycle, in spray part, mercurous mixed gas are cooled down using waste water meanwhile, it is achieved thereby that the zero-emission of waste water,
Meanwhile, saved cost.
Brief description
Fig. 1 is the structural representation of the present invention；
Each in figure above：1st, tail gas treating unit；2nd, condensing unit.
Specific embodiment
Below, by exemplary embodiment, the present invention is specifically described.It should be appreciated, however, that not entering one
In the case of step narration, the element in an embodiment, structure and features can also be advantageously incorporated into other embodiment
In.
As shown in figure 1, a kind of thermal desorption system processing mercury contaminated soil, enter material list including can convey mercury contaminated soil
Unit, feed unit is connected with and can heat the thermal desorption unit that mercury contaminated soil makes hydrargyrum evaporate, and thermal desorption unit is provided with and can input
The soil entrance of mercury contaminated soil, and the gas outlet of mercurous mixed gas can be discharged, soil entrance is gone out with feed unit
Mouthful end connects, and gas outlet is connected with the mixed gas processing mechanism of hydrargyrum in separable mercurous mixed gas and dust granule,
Thermal desorption unit is additionally provided with gas access, and gas access is connected with the outlet side of mixed gas processing mechanism.
The thermal desorption system that the present invention processes mercury contaminated soil is passed through the gas access of thermal desorption unit and mixed gas
The outlet side of processing mechanism connects, so that the waste gas that mixed gas processing mechanism produces obtains cycling and reutilization, meanwhile, using useless
Gas purges to the mercurous mixed gas of volatilization in thermal desorption unit, thus accelerating the flowing of mercurous mixed gas, and then
Achieve the zero-emission of waste gas, meanwhile, improve the organic efficiency to hydrargyrum and dust for the whole thermal desorption device.
Further, thermal desorption unit can be connected with the soil collecting means that can receive soil after thermal desorption unit output is processed,
Thermal desorption unit is provided with the soil outlet of exportable soil after processing, and soil outlet is connected with soil collecting means.
For the structure of above-mentioned mixed gas processing mechanism, specially：Mixed gas processing mechanism includes separable mercurous
Gas phase in mixed gas and the dust removing units of solid matter, and mercurous mixed gas can be cooled down so that the condensation list of mercury solution
Unit 2, the inlet end of dust removing units is connected with the gas outlet of thermal desorption unit, and the outlet side of dust removing units is with condensing unit 2 even
Connect, the outlet side of condensing unit 2 is connected with the gas access of thermal desorption unit.Present invention setting dust removing units and condensing unit 2
Effect be, be capable of the mercurous mixed gas discharged from thermal desorption unit are carried out successively with the process of dedusting and the removal of mercury,
And then improve the purification efficiency to mercurous mixed gas.
Preferably, dust removing units can be one kind of for cyclone dust extractor, sack cleaner or electric cleaner.
Further, be connected between the outlet side of mixed gas processing mechanism and thermal desorption unit gas access can convey useless
Gas to thermal desorption unit tail gas treating unit 1.
For the structure of above-mentioned tail gas treating unit 1, specially：Tail gas treating unit 1 includes removing fog in waste gas
Demister, the inlet end of demister is connected with the outlet side of mixed gas processing mechanism, the outlet side of demister and thermal desorption
The gas access of unit connects.The effect that the present invention arranges demister is, can discharge waste gas to from mixed gas processing mechanism
In steam and the hydrargyrum that is adsorbed in steam carry out separating, to be additionally separated to hydrargyrum.
Further, tail gas treating unit 1 also includes the waste gas reheater that can heat waste gas, the inlet end of waste gas reheater with
The outlet side of demister connects, and the outlet side of waste gas reheater is connected with the gas access of thermal desorption unit.Present invention setting is useless
The effect of gas reheater is, by inputting heat-treated waste gas to thermal desorption unit, to assist thermal desorption unit
Supplying heat source in thermal desorption unit mercury contaminated soil heat, thus the energy decreasing thermal desorption unit supplying heat source is defeated
Go out, and then saved cost.
In addition, waste gas reheater is provided with the fire end that can heat waste gas in waste gas reheater, thermal desorption unit is provided with
Exportable thermal desorption unit waste heat (if thermal desorption unit is heated by the sky steam that burns, the carrier of waste heat is flue gas)
Waste heat exports, and the waste heat outlet of thermal desorption unit is connected with the fire end of waste gas reheater.The acting on of the above-mentioned setting of the present invention
In, the utilization to thermal desorption unit waste heat for the realization, to avoid the waste of waste heat, meanwhile, decrease thermal desorption unit supplying heat source
Energy exports, and then has saved cost.
Further, tail gas treating unit 1 also includes the activated carbon adsorption part of hydrargyrum in separable waste gas, and activated carbon adsorption part is
Outlet side with condensing unit 2 as shown in Figure 1 is connected, now, the outlet side of activated carbon adsorption part and atmosphere；Additionally,
Activated carbon adsorption part is also connected in the gas circuit that mist eliminator and waste gas reheater are located.
For the structure of above-mentioned condensing unit 2, specially：As shown in figure 1, condensing unit 2 include can be to mercurous gaseous mixture
The spray part of body spraying cooling, the inlet end of spray part is connected with the outlet side of dust removing units, and the outlet side of spray part and heat take off
The gas access of coupon unit connects, and spray part is provided with the water inlet that can input cooling water, and exportable going out containing mercury solution
The mouth of a river, the water inlet of spray part is connected with the water cooling unit that can provide cooling water, and the outlet of spray part is connected with separable
The hydrargyrum water separative element of hydrargyrum.
In addition, the water side of hydrargyrum water separative element is connected with water cooling unit.The heat that the present invention processes mercury contaminated soil takes off
Attached system passes through setting spray part, hydrargyrum water separative element and water cooling unit, and by hydrargyrum water separative element and water cooling unit
Connect so that through hydrargyrum water separative element output waste water obtain cycling and reutilization, meanwhile, using waste water spray part in mercurous
Mixed gas are cooled down, it is achieved thereby that the zero-emission of waste water, meanwhile, have saved cost.
Further, condensing unit 2 also includes the condensing part that the mixed gas of spray part output can be cooled down further, condensation
The inlet end of part is connected with the outlet side of spray part, and the outlet side of condensing part is connected with the gas access of thermal desorption unit, condensation
Part is provided with the exportable condensing part outlet containing mercury solution, and condensing part outlet is connected with hydrargyrum water separative element, and condensing part is even
It is connected to the refrigeration machine that condensing part cold-producing medium can be provided.The present invention passes through setting spray part and condensing part, to realize to mercurous mixing
Gas carries out two grades of coolings, to be sufficiently separated the hydrargyrum in mercurous mixed gas.
Preferably, hydrargyrum water separative element is that hydrocyclone, centrifuge or sedimentation tank are one kind of.
With further reference to such as Fig. 1, the invention still further relates to a kind of thermal desorption method processing mercury contaminated soil, walk including following
Suddenly：
S0：Pending mercury contaminated soil is inputted by feed unit and is processed to thermal desorption unit, heat is de-
The heating of coupon unit, so that the mercury vapour in mercury contaminated soil.
For the processing procedure of thermal desorption unit in step S0, specially：Pretreated homogenizing is contained mercury contaminated soil
It is delivered in thermal desorption unit and is processed, mercury contaminated soil indirectly heat will be contained by fuel combustion mode, so that mercurous dirt
There is gasification volatilization in the hydrargyrum in dye soil and moisture, and realize and being completely separated of solid phase.
Preferably, thermal desorption unit will contain mercury contaminated soil and be heated to 350～600 DEG C, and heat time heating time be 30～
60min.
S1：The soil isolated through thermal desorption unit is discharged after cooling, the mercurous mixing isolated through thermal desorption unit
Gas inputs to mixed gas processing mechanism, to carry out to the hydrargyrum in mercurous mixed gas and dust separating, to discharge waste gas.
The method processing mercurous mixed gas for mixed gas processing mechanism in step S1, specifically, include step S3：
The soil isolated through thermal desorption unit is discharged after cooling, inputs to removing through the mercurous mixed gas that thermal desorption unit is isolated
Dust granule in mercurous mixed gas is separated by dirt unit by dust removing units, meanwhile, by the mercurous mixed gas after processing
Discharge from dust removing units.
Further, the mercurous mixed gas after processing are expelled to condensing unit 2, in said process, mercurous mixed for preventing
Close gas cooling, dust removing units can be by the thick insulation material parcel of 40～150mm.
The method mercurous mixed gas being processed for above-mentioned condensing unit 2, specifically, include step S4:Will be from dedusting
The mercurous mixed gas discharged in unit input to spray part, to carry out cooling process to mercurous mixed gas, meanwhile, make hydrargyrum
Cooling liquid, and mercury solution will be contained from spray part discharge.
Preferably, acted on by the spray of spray unit, the temperature of mercurous mixed gas can be down to 40～70 DEG C.
Further, the method that condensing unit 2 is processed to mercurous mixed gas also includes step S5：By discharge from spray part
Input to hydrargyrum water separative element containing mercury solution, to carry out separating to containing the hydrargyrum in mercury solution, and after processing the water that obtain from
Hydrargyrum water separative element is discharged.
Further, the method that condensing unit 2 is processed to mercurous mixed gas also includes step S6：Will be from hydrargyrum water separative element
The water discharged inputs to water cooling unit, to carry out cooling treatment to water, and by the cooling water after cooling treatment from water cooling
Unit is discharged；
Further, the method that condensing unit 2 is processed to mercurous mixed gas also includes step S7：To arrange from water cooling unit
The cooling water going out inputs to spray part, to carry out cooling treatment to the mercurous mixed gas in spray part；
In addition, the method that condensing unit 2 is processed to mercurous mixed gas also includes：The mercurous mixing that will discharge from spray part
Gas is delivered in condensing part, and condensing part further cools down to mercurous mixed gas, and discharges useless to tail gas treating unit
Gas.
Preferably, the temperature of mercurous mixed gas can be further reduced to 0～10 DEG C by condensing part.
S2：The waste gas discharged from mixed gas processing mechanism is inputted de- to heat by the gas access of thermal desorption unit
In coupon unit, to accelerate the circulation of the mercurous mixed gas of volatilization in thermal desorption unit.
In addition, step S2 is further comprising the steps of：The drying through mist eliminator for the waste gas, and logical after the heating of waste gas reheater
The gas access crossing thermal desorption unit inputs to thermal desorption unit, to accelerate the mercurous mixed gas of volatilization in thermal desorption unit
Circulation, during, if desired for outside drain waste gas, then first to waste gas after activated carbon adsorption part removal of mercury process, then discharge
To air.
After tested, the application present invention processes the thermal desorption system of mercury contaminated soil and method with the treating capacity of 8t/h, with
And under 350～600 DEG C of thermal desorption unit internal operating temperature, process to containing mercury contaminated soil, obtain Mercury In Soil
Concentration is less than 10mg/kg, and meanwhile, tail gas reaches after treatment《Discharge standard of air pollutants》(GB16297-
1996).
Claims (10)
1. a kind of thermal desorption system processing mercury contaminated soil, including the feed unit that can convey mercury contaminated soil, feed unit
It is connected with and can heat the thermal desorption unit that mercury contaminated soil makes hydrargyrum evaporate, thermal desorption unit is provided with and can input mercury contaminated soil
Soil entrance, and the gas outlet of mercurous mixed gas can be discharged, soil entrance is connected with the port of export of feed unit, gas
Outlet be connected with hydrargyrum in separable mercurous mixed gas and dust granule mixed gas processing mechanism it is characterised in that：Heat
Desorption unit is additionally provided with gas access, and gas access is connected with the outlet side of mixed gas processing mechanism.
2. according to claim 1 process mercury contaminated soil thermal desorption system it is characterised in that：Mixed gas datatron
Structure includes the dust removing units of gas phase in separable mercurous mixed gas and solid matter, and can cool down mercurous mixed gas with
Make the condensing unit (2) of mercury solution, the inlet end of dust removing units is connected with the gas outlet of thermal desorption unit, the going out of dust removing units
Gas end is connected with condensing unit (2), and the outlet side of condensing unit (2) is connected with the gas access of thermal desorption unit.
3. according to claim 1 and 2 process mercury contaminated soil thermal desorption system it is characterised in that：At mixed gas
It is connected with, between the outlet side of reason mechanism and thermal desorption unit gas access, the vent gas treatment that waste gas can be conveyed to thermal desorption unit
Unit (1).
4. according to claim 3 process mercury contaminated soil thermal desorption system it is characterised in that：Tail gas treating unit
(1) include removing the demister of fog in waste gas, the inlet end of demister is connected with the outlet side of mixed gas processing mechanism,
The outlet side of demister is connected with the gas access of thermal desorption unit.
5. according to claim 4 process mercury contaminated soil thermal desorption system it is characterised in that：Tail gas treating unit
(1) include heating the waste gas reheater of waste gas, the inlet end of waste gas reheater is connected with the outlet side of demister, waste gas reheating
The outlet side of device is connected with the gas access of thermal desorption unit.
6. according to claim 5 process mercury contaminated soil thermal desorption system it is characterised in that：Waste gas reheater is arranged
There is the fire end that can heat waste gas in waste gas reheater, the waste heat that thermal desorption unit is provided with exportable thermal desorption unit waste heat goes out
Mouthful, the waste heat outlet of thermal desorption unit is connected with the fire end of waste gas reheater.
7. according to claim 2 process mercury contaminated soil thermal desorption system it is characterised in that：Condensing unit (2) wraps
Including can be to the spray part of mercurous mixed gas spraying cooling, and the inlet end of spray part is connected with the outlet side of dust removing units, spray
The outlet side of part is connected with the gas access of thermal desorption unit, and spray part is provided with the water inlet that can input cooling water, Yi Jike
The outlet containing mercury solution for the output, the water inlet of spray part is connected with the water cooling unit that can provide cooling water, sprays going out of part
The mouth of a river is connected with the hydrargyrum water separative element of separable hydrargyrum.
8. according to claim 7 process mercury contaminated soil thermal desorption system it is characterised in that：Hydrargyrum water separative element
Water side is connected with water cooling unit.
9. described in a kind of application claim 1, process the thermal desorption of the process mercury contaminated soil of thermal desorption system of mercury contaminated soil
Method it is characterised in that：Comprise the following steps,
S0：Pending mercury contaminated soil is inputted by feed unit and is processed to thermal desorption unit, by thermal desorption list
Unit's heating, so that the mercury vapour in mercury contaminated soil；
S1：The soil isolated through thermal desorption unit is discharged after cooling, the mercurous mixed gas isolated through thermal desorption unit
Input to mixed gas processing mechanism, to carry out to the hydrargyrum in mercurous mixed gas and dust separating, to discharge waste gas；
S2：The waste gas discharged from mixed gas processing mechanism is inputted to thermal desorption list by the gas access of thermal desorption unit
In unit, to accelerate the circulation of the mercurous mixed gas of volatilization in thermal desorption unit.
10. the heat processing the process mercury contaminated soil of thermal desorption system of mercury contaminated soil described in a kind of application claim 8 takes off
Subsidiary formula method it is characterised in that：Comprise the following steps,
S0：Pending mercury contaminated soil is inputted by feed unit and is processed to thermal desorption unit, by thermal desorption list
Unit's heating, so that the mercury vapour in mercury contaminated soil；
S3：The soil isolated through thermal desorption unit is discharged after cooling, the mercurous mixed gas isolated through thermal desorption unit
Input to dust removing units, by dust removing units, the dust granule in mercurous mixed gas is separated, meanwhile, mercurous after processing
Mixed gas are discharged from dust removing units；
S4：The mercurous mixed gas discharged from dust removing units are inputted to spray part, to drop to mercurous mixed gas
Temperature is processed, and meanwhile, makes hydrargyrum cooling liquid, and will contain mercury solution from spray part discharge；
S5：Input discharge from spray part to hydrargyrum water separative element containing mercury solution, to carry out point to containing the hydrargyrum in mercury solution
From, and the water that will obtain after processing is from the discharge of hydrargyrum water separative element；
S6：The water discharged from hydrargyrum water separative element is inputted to water cooling unit, so that cooling treatment is carried out to water, and will cool down
Cooling water after process is discharged from water cooling unit；
S7：The cooling water discharged from water cooling unit is inputted to spray part, to enter to the mercurous mixed gas in spray part
Row cooling treatment.
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