CN108480381A - A kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedure of chilling- - Google Patents
A kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedure of chilling- Download PDFInfo
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- CN108480381A CN108480381A CN201810365175.0A CN201810365175A CN108480381A CN 108480381 A CN108480381 A CN 108480381A CN 201810365175 A CN201810365175 A CN 201810365175A CN 108480381 A CN108480381 A CN 108480381A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000002689 soil Substances 0.000 title claims abstract description 37
- 238000005265 energy consumption Methods 0.000 title claims abstract description 23
- 238000001179 sorption measurement Methods 0.000 claims abstract description 72
- 238000003795 desorption Methods 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 20
- 231100000719 pollutant Toxicity 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 239000000428 dust Substances 0.000 claims abstract description 10
- 238000010791 quenching Methods 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 230000008929 regeneration Effects 0.000 claims description 8
- 238000011069 regeneration method Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 239000000356 contaminant Substances 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000005416 organic matter Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 230000008439 repair process Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 18
- 239000000203 mixture Substances 0.000 claims 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 238000010926 purge Methods 0.000 claims 1
- 238000009833 condensation Methods 0.000 description 11
- 230000005494 condensation Effects 0.000 description 11
- 239000000498 cooling water Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 5
- 239000004519 grease Substances 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005067 remediation Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000004821 distillation Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 150000003071 polychlorinated biphenyls Chemical group 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0462—Temperature swing adsorption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
- F28C3/08—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour with change of state, e.g. absorption, evaporation, condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to the adsorbing coupled restorative procedures of organic polluted soil low energy consumption thermal desorption chilling.The restorative procedure includes three digest journals：Thermal desorption system, chilling system and adsorption system.Wherein, main unit operating equipment includes air preheater, thermal desorption device, tail gas dust cleaning apparatus in thermal desorption system.Main unit operating equipment includes in chilling system：Chilling tower, steam generator, oil water separator, auxiliary condenser, regenerator.Main unit operating equipment includes in adsorption system：Compressor, adsorption tower group, secondary condenser, vacuum pump and water cooler etc..The present invention is not only recycled heat in thermal desorption high-temperature tail gas, while realizing the resource utilization of pollutant in tail gas, reaches green, energy-efficient improvement purpose.
Description
Technical field
The invention belongs to environment remediation fields and chemical industry mass-and heat-transfer field, and in particular to heterogeneous system heating, gas-liquid pass
The operating process such as matter heat transfer, absorption, distillation, condensation.
Technical background
Soil pollution has seriously threatened agricultural, industry hair as one of the three big pollutions arranged side by side with atmosphere pollution, water pollution
Exhibition or even human health.Organic polluted soil is component part important in soil pollution, due to its pollutant extensively, removal
Difficulty causes a large amount of soil that can not be used effectively.Thermal desorption technology reparation rate is fast, and contaminant removal efficiency is high, application
Not by environmental restrictions, it is particularly suitable for volatility, the lash-up recovering in half volatile organic contamination place.However, traditional heat is de-
Attached technology deposits problem both ways, first, process energy consumption is higher, needs sufficiently high temperature to make in soil during thermal desorption
Pollutant vaporize, however, the heat in tail gas after thermal desorption is not yet recycled or utilization it is insufficient (CN103658165A,
CN203578349U, CN104438313A, CN106180169A).Second is that vent gas treatment is difficult.It is used in traditional thermal desorption method
Secondary burning, catalytic oxidation technologies or simple activated carbon adsorption processing tail gas (CN104906876A, CN106216382A,
CN106623395A), although treatment effect disclosure satisfy that environmental requirement, of high cost, material consumption is big.
Invention content
The object of the present invention is to provide organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedures of chilling-.The party
Method using chilling technique in high-temperature tail gas heat and pollutant be recycled；Meanwhile using adsorption technology to tail gas
Middle pollutant is further adsorbed, and is on the one hand ensured that exhaust emissions meets environmental protection standard, is on the other hand significantly reduced tail gas
Processing cost.
The technology of the present invention is as follows：
A kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedure of chilling-, steps are as follows：
(1) organic polluted soil generates the high-temperature tail gas containing organic pollution after heating；
(2) high-temperature tail gas enters chilling tower hypomere and quench oil progress heat exchange after tail gas dust cleaning apparatus dedusting, takes heat
Quench oil afterwards recycles heat by steam generator, as the air preheater either heat of power generation or fluid media (medium)
Source；
(3) chilling tower tower reactor extraction part quench oil enters regenerator and is regenerated, and chilling tower epimere uses cooling water and tail
Gas exchanges heat, and produces condensate liquid；
(4) the low temperature exhaust gas after chilling tower cooler enters adsorption system, is carried out to low concentration volatile organic matter therein
Absorption and recycling.
Moreover, the step (2) in chilling tower be divide into upper part and lower part, using liter gas disk as line of demarcation：Hypomere is high temperature
Most of heat in high-temperature tail gas is recycled in tail gas and quench oil direct heat transfer；Epimere be tail gas and water directly or
Heat exchange is connect, exhaust temperature is cooled to 10~60 DEG C.
Moreover, the step (4) in adsorption system use temperature swing adsorption process or pressure swing adsorption technique, use 1~8
Adsorption tower is operated；Desorption and regeneration is carried out after adsorption saturation.
Moreover, regeneration is heating, vacuum parsing or vacuum analysis.
Moreover, secondary condenser condenses the high concentration organic contaminant after desorption, condensed pollutant carries out
Resource utilization, uncooled gas phase squeeze into suction port of compressor through vacuum pump and enter adsorption tower progress second adsorption.
A kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled repair system of chilling-, including thermal desorption system, urgency
Cooling system and adsorption system；The thermal desorption system is made of air preheater, thermal desorption device, tail gas dust cleaning apparatus；Institute
The chilling system stated is made of chilling tower, steam generator, oil water separator, auxiliary condenser, regenerator；The absorption system
System is made of compressor, adsorption tower group, secondary condenser and water cooler, and specific connection relation is：
Air preheater discharge port connects thermal desorption device feed inlet, connects the gas vent connection tail on thermal desorption device top
Gas dust-extraction unit；Tail gas dust cleaning apparatus gas outlet connects the lower part air inlet of chilling tower, and chilling tower top gas outlet passes through compression
Machine is connected in parallel the feed inlet of the first adsorption tower and the second adsorption tower, the discharge port connection time of the first adsorption tower and the second adsorption tower
Grade condenser；
Chilling tower bottom of tower outlet connection regenerator, the outlet of regenerator overhead gas connect water-oil separating after condenser
Device, the oil phase outlet connection chilling tower middle part oil inlet of oil water separator；
The cyclic steam outlet connection water cooler of air preheater, water cooler water outlet connect the air inlet of evaporator, steam
The cyclic steam entrance of the gas outlet connection preheater of vapour generator.
Compared with prior art, the distinctive feature of the invention has：
1, the heat during soil thermal desorption and tail gas quenching and tail gas adsorption is coupled, in high-temperature tail gas
Heat be recycled, significantly reduce process energy consumption.Meanwhile realized in quenching process to the resource utilization of pollutant,
Efficiently solve the high cost problem that the exhaust gas treating methods such as traditional secondary burning, catalysis oxidation are related to.
2, using adsorption technology, advanced treating is carried out to organic matter in thermal desorption tail gas, ensures that emptying end gas is fully achieved
Environmental emission standard.Meanwhile high concentration organic contaminant after desorption is condensed, carry out resource utilization.
3, this method is suitable for all kinds of organic polluted soil reparations.
Description of the drawings
A kind of adsorbing coupled repair system schematic diagrames of organic polluted soil low energy consumption thermal desorption-chilling-of Fig. 1
Label declaration：1. air preheater；2. thermal desorption device；3. tail gas dust cleaning apparatus；4. chilling tower；5. steam generation
Device；6. oil water separator；7. auxiliary condenser；8. regenerator；9. compressor；10. adsorption tower A；11. adsorption tower B；12. time grade
Condenser；13. vacuum pump；14. water cooler；S1. cooling water return water；S2. water on cooling water；S3.VOCs is recycled；S4. cooling water
Return water；S5. water on cooling water；S6. lime set produces；S7. fresh water supplements；S8. pollutant recycles；S9, condensed water extraction；S10.
Live steam；S11. air；S12. tail gas is vented；V1-V8. control valve.
Note：This attached drawing is only a kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedure of chilling-
One of which specific manifestation form.
Specific implementation mode
Technology and equipment operation characteristic according to the present invention is further described below in conjunction with the accompanying drawings.
The present invention provides a kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedure of chilling-
Thermal desorption system, chilling system and adsorption system.Wherein, the key equipment involved in thermal desorption system has air preheater 1, heat
Desorption apparatus 2, tail gas dust cleaning apparatus 3；Key equipment involved in chilling system has chilling tower 4, steam generator 5, grease point
From device 6, auxiliary condenser 7, regenerator 8；Key equipment involved in adsorption system has compressor 9, adsorption tower (A) 10, and inhales
Attached tower (B) 11, secondary condenser 12, vacuum pump 13 and water cooler 14.Specifically connection relation is：1 discharge port of air preheater
2 feed inlet of thermal desorption device is connected, the gas vent connection tail gas dust cleaning apparatus 3 on thermal desorption device top is connect；Tails dedusting fills
The lower part air inlet of gas outlet connection chilling tower 4 is set, chilling tower top gas outlet is connected in parallel the suction of the first adsorption tower 10 and second
The feed inlet of attached tower 11, the first adsorption tower 10 connect secondary condenser with the discharge port of the second adsorption tower 11.
4 bottom of tower of chilling tower outlet connection regenerator 8, the outlet of regenerator overhead gas connect grease point after condenser 7
From device 6, the oil phase outlet connection chilling tower middle part oil inlet of oil water separator；
The cyclic steam outlet connection water cooler 14 of air preheater 1, water cooler water outlet connect the air inlet of evaporator 5
Mouthful, the cyclic steam entrance of the gas outlet connection preheater 1 of steam generator 5；
The residual gas of chilling tower is exported is connected to the first adsorption tower and the second adsorption tower by compressor 9.
A kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedure of chilling-, this method is as follows
Implement：
(1) organic polluted soil generates the high-temperature tail gas containing organic pollution after heating；
(2) high-temperature tail gas carries out heat exchange after tail gas dust cleaning apparatus dedusting through over-quenching tower hypomere and quench oil, takes heat
Quench oil afterwards recycles heat by steam generator, the heat source as air preheater；
(3) chilling tower tower reactor extraction part quench oil enters regenerator and is regenerated, and chilling tower epimere uses cooling water and tail
Gas exchanges heat, and produces condensate liquid；
(4) the low temperature exhaust gas after chilling tower cooler enters adsorption system, and low concentration VOCs therein is adsorbed and returned
It receives.
Step (1) in heating can be electrical heating in situ or hot air, can also be dystopy rotary furnace, fluidisation
The heating of the equipment such as bed.
Step (2) in tail gas dust cleaning apparatus can be cyclone separator, electrostatic precipitator or granular-bed filter；Chilling
In system, chilling tower is divide into upper part and lower part, using liter gas disk as line of demarcation：Hypomere is that high-temperature tail gas and quench oil directly change
Heat recycles most of heat in high-temperature tail gas；Epimere is that tail gas and water directly or indirectly exchange heat, and exhaust temperature is cold
But to 10~60 DEG C, pollutant concentration and water content in tail gas are further decreased, while a small amount of condensate liquid is produced from liter gas disk.
After chilling tower hypomere, quench oil and high-temperature tail gas direct heat transfer, most of quench oil utilizes the heat of absorption by steam generator
Amount generates steam, the heat source as air preheater in thermal desorption system.Quench oil after steam generator takes heat is from chilling
It (rises below gas disk) and sprays and lower continuation exchanges heat with high-temperature tail gas in the middle part of tower.Meanwhile going out the exhaust steam after air preheater
Enter steam generator reuse after water cooled device condensation.In addition, a part of quench oil enters regenerator from chilling tower tower reactor, pass through
Stripping or distillation means realize the separation of organic pollution and quench oil.When pollutant is heavy constituent, tower reactor produces pollutant,
By its resource utilization.Overhead extraction quench oil, after auxiliary condenser cooling is detached with oil water separator, quench oil enters urgency
Cold tower hypomere is recycled.When pollutant is light component, regenerator overhead extraction pollutant, after auxiliary condenser cools down
It is recycled.Regenerator tower reactor extraction quench oil enter steam generator to heat after recycled into chilling tower.
Step (4) in absorption workshop section be temperature swing adsorption process or pressure swing adsorption technique, grasped using 1~8 adsorption tower
Make, desorption and regeneration is carried out after adsorption saturation；Regeneration is heating, vacuum parsing or vacuum analysis.Adsorption system utilizes secondary
Grade condenser condenses the high concentration organic contaminant after desorption, and condensed pollutant carries out resource utilization, not cold
Solidifying gas phase squeezes into suction port of compressor through vacuum pump and enters adsorption tower progress second adsorption.
Embodiment 1
Pollutant component is polycyclic aromatic hydrocarbon (PAHs) and benzene homologues (BTEX) in discarded coke-oven plant's soil, using organic dirt
It contaminates the adsorbing coupled restorative procedure of soil low energy consumption thermal desorption-chilling-and carries out soil remediation.
In thermal desorption system, fresh air enters rotary kiln 2 after air preheater 1 is heated to 100~150 DEG C.
In rotary kiln 2, the organic polluted soil residence time is 20~60min, and heating temperature is 420~460 DEG C.Contaminated soil is through overheat
Processing reaches repairing standard, and backfill is produced from rotary kiln 2.Meanwhile the high-temperature tail gas that thermal desorption generates enters whirlwind through flue
Separator 3, to remove the solid particle in tail gas.Wherein, cyclone separator 3 takes isothermal holding, prevents organic in tail gas
Pollutant condenses.High-temperature tail gas after dedusting enters chilling system, and temperature is 380~400 DEG C at this time.
In chilling system, high-temperature tail gas enters 4 tower reactor of chilling tower, with spray and under quench oil counter current contacting directly change
Heat.After the completion of heat exchange, majority of organic pollutants condensation is simultaneously produced from chilling tower tower reactor with quench oil together, temperature for 250~
300℃.Most quench oil generates steam by steam generator 5 after extraction, and air will be used as after the heat recovery of absorption
1 heat source of preheater.Enter the progress reuse of chilling tower from gas disk lower part is risen to the quench oil after heat.Meanwhile after going out air preheater 1
The water cooled device 14 of exhaust steam condense after, be recycled to the recycling of steam generator 5.In addition, fraction quench oil is from 4 tower of chilling tower
Kettle enters regenerator 8, regenerates quench oil from stripped overhead under stripping effect, enters grease after the condensation of auxiliary condenser 7
Separator 6 carries out water-oil separating.Then enter chilling tower 4 from a liter gas disk lower part again and continues to participate in heat exchange.After exchanging heat with quench oil
Exhaust temperature be 90~120 DEG C, entering chilling tower epimere and cooling water after chilling tower rises the distribution of gas disk carries out indirect heat exchange.
Meanwhile the time condensation liquid after water cooling rises from 4 middle part of chilling tower and is produced on gas disk.Exhaust temperature after heat exchange is 10~60 DEG C,
Then enter adsorption system.
In adsorption system, using pressure swing adsorption technique, adsorbent is silica gel.Tail gas after cooling is pressed by compressor 9
It is adsorbed into adsorption tower (A) 10 after contracting, 10 100~400kPa of operating pressure of adsorption tower (A).After silica gel absorption in tail gas
Pollutant concentration reaches environmental emission standard, is directly vented.Meanwhile adsorption tower (B) 11 carries out vacuum analysis regeneration, operating pressure
For 1~10kPa.High concentration VOCs after desorption is in secondary condenser partial condensation, and lime set extraction carries out resource utilization, not
The gas of condensation by the supercharging of vacuum pump 13 squeezes into 9 entrance of compressor after being condensed by secondary condenser 12, into adsorption tower,
Further adsorbed.At this point, control valve V1, V4, V5, V8 are in open state, V2, V3, V6, V7 are closed.It inhales
Attached tower (A) 10 and 11 switching cycle of adsorption tower (B) are 8~16 hours, control valve V1 after function switch, V4, V5, V8 in closing
State, V2, V3, V6, V7 are in open state, such circulate operation.
Embodiment 2
Pollutant component is Polychlorinated biphenyls (PCBs) in soil in waste and old electric capacitor factory, low using the organic polluted soil
The adsorbing coupled restorative procedure of energy consumption thermal desorption-chilling-carries out soil remediation.
In thermal desorption system, fresh air enters rotary kiln 2 after air preheater 1 is heated to 120~180 DEG C.
In rotary kiln 2, the organic polluted soil residence time is 40~80min, and heating temperature is 500~580 DEG C.Contaminated soil is through overheat
Processing reaches repairing standard, and backfill is produced from rotary kiln 2.Meanwhile the high-temperature tail gas that thermal desorption generates enters particle through flue
Layer filter 3, to remove the solid particle in tail gas.Wherein, granular-bed filter 3 takes isothermal holding, prevents in tail gas
Organic pollution condenses.High-temperature tail gas after dedusting enters chilling system, and temperature is 480~500 DEG C at this time.
In chilling system, high-temperature tail gas enters 4 tower reactor of chilling tower, with spray and under quench oil counter current contacting directly change
Heat.After the completion of heat exchange, majority of organic pollutants condensation is simultaneously produced from chilling tower tower reactor with quench oil together, temperature for 300~
350℃.Most quench oil generates steam by steam generator 5 after extraction, and air will be used as after the heat recovery of absorption
1 heat source of preheater.Enter the progress reuse of chilling tower from gas disk lower part is risen to the quench oil after heat.Meanwhile after going out air preheater 1
The water cooled device 14 of exhaust steam condense after, be recycled to the recycling of steam generator 5.In addition, fraction quench oil is from 4 tower of chilling tower
Kettle enters regenerator 8, regenerates quench oil from stripped overhead under stripping effect, enters grease after the condensation of auxiliary condenser 7
Separator 6 carries out water-oil separating.Then enter chilling tower 4 from a liter gas disk lower part again and continues to participate in heat exchange.After exchanging heat with quench oil
Exhaust temperature be 80~120 DEG C, entering chilling tower epimere and cooling water after chilling tower rises the distribution of gas disk carries out indirect heat exchange.
Meanwhile the time condensation liquid after water cooling rises from 4 middle part of chilling tower and is produced on gas disk.Exhaust temperature after heat exchange is 10~60 DEG C,
Then enter adsorption system.
In adsorption system, using temp.-changing adsorption method, adsorbent is XAD-2 macroreticular resins.Tail gas after cooling passes through
Compressor 9 is adsorbed after compressing into adsorption tower (A) 10, and 10 operating pressure of adsorption tower (A) is normal pressure, operation temperature for 40~
50℃.Pollutant concentration is less than 1ppm in tail gas after XAD-2 macroporous resin adsorptions, is directly vented.Meanwhile adsorption tower (B) 11
Heating, vacuum parsing regeneration is carried out, operating pressure is 5~10kPa, and operation temperature is 110 DEG C~120 DEG C.High concentration after desorption
VOCs carries out resource utilization in secondary condenser partial condensation, lime set extraction, and uncooled gas passes through vacuum pump 13
9 entrance of compressor is squeezed into further to be adsorbed into adsorption tower.At this point, control valve V1, V4, V5, V8 are in open state,
V2, V3, V6, V7 are closed.Adsorption tower (A) 10 and 11 switching cycle of adsorption tower (B) are 8~16 hours, function switch
Control valve V1 afterwards, V4, V5, V8 are closed, V2, V3, V6, and V7 is in open state, such circulate operation.
Organic polluted soil low energy consumption proposed by the present invention-chilling coupling renovation technique is retouched by case study on implementation
State, related technical personnel obviously can not depart from the content of present invention, in spirit and scope to structure as described herein and equipment into
Row is changed and suitably changed realizes the technology of the present invention with combining.In particular, all similar substitutions and modifications are to this
It is it will be apparent that they are considered as being included in spirit of that invention, range and content for the technical staff in field.
Claims (8)
1. a kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled restorative procedure of chilling-, it is characterised in that：Steps are as follows：
(1) organic polluted soil generates the high-temperature tail gas containing organic pollution after heating；
(2) enter chilling tower hypomere after high-temperature tail gas dedusting demisting and carry out heat exchange with quench oil, the quench oil after heat is taken to pass through
Steam generator recycles heat；
(3) chilling tower tower reactor extraction part quench oil is regenerated, and chilling tower epimere carries out heat exchange cooling to tail gas, and produces and change
Condensate liquid after heat；
(4) the low temperature exhaust gas after chilling tower cooler enters adsorption system, is adsorbed to low concentration volatile organic matter therein
And recycling.
2. the organic polluted soil low energy consumption thermal desorption according to claim 1-adsorbing coupled restorative procedure of chilling-, special
Sign is：The step (2) in chilling tower be divide into upper part and lower part, using liter gas disk as line of demarcation：Hypomere be high-temperature tail gas and
Most of heat in high-temperature tail gas is recycled in quench oil direct heat transfer；Epimere is that tail gas and water directly or indirectly exchange heat,
Exhaust temperature is cooled to 10~60 DEG C.
3. the organic polluted soil low energy consumption thermal desorption according to claim 1-adsorbing coupled restorative procedure of chilling-, special
Sign is：The step (4) in adsorption system use temperature swing adsorption process or pressure swing adsorption technique, use 1~8 adsorption tower
It is operated；Desorption and regeneration is carried out after adsorption saturation.
4. the organic polluted soil low energy consumption thermal desorption according to claim 1-adsorbing coupled restorative procedure of chilling-, special
Sign is：Regeneration is heating-nitrogen purging coupling desorption, vacuum analysis or heating, vacuum parsing.
5. the organic polluted soil low energy consumption thermal desorption according to claim 1-adsorbing coupled restorative procedure of chilling-, special
Sign is：The high concentration organic contaminant after desorption is condensed using secondary condenser, condensed pollutant is provided
Sourceization recycles, and uncooled gas phase squeezes into suction port of compressor through vacuum pump and enters adsorption tower progress second adsorption.
6. the organic polluted soil low energy consumption thermal desorption according to claim 1-adsorbing coupled restorative procedure of chilling-, special
Sign is：Condensate liquid is the mixture of organic matter, water, and the mixture is using multistage liquid-liquid equilibrium or the side of multi-stage gas-liquid balance
Method is isolated and purified.
7. a kind of organic polluted soil low energy consumption thermal desorption-adsorbing coupled repair system of chilling-, it is characterised in that：It is de- including heat
Attached system, chilling system and adsorption system；The thermal desorption system is filled by air preheater, thermal desorption device, tails dedusting
Set composition；The chilling system is made of chilling tower, steam generator, oil water separator, auxiliary condenser, regenerator；Institute
The adsorption system stated is made of compressor, adsorption tower group, secondary condenser and water cooler, and specific connection relation is：
Air preheater discharge port connects thermal desorption device feed inlet, and the gas vent connection tail gas for connecing thermal desorption device top removes
Dirt device；Tail gas dust cleaning apparatus gas outlet connect chilling tower lower part air inlet, chilling tower top gas outlet by compressor simultaneously
The discharge port connection of the feed inlet of connection connection the first adsorption tower and the second adsorption tower, the first adsorption tower and the second adsorption tower is secondary cold
Condenser；
Chilling tower bottom of tower outlet connection regenerator, the outlet of regenerator overhead gas connect oil water separator after condenser, oil
Oil inlet in the middle part of the oil phase outlet connection chilling tower of separator；
The cyclic steam outlet connection water cooler of air preheater, water cooler water outlet connect the air inlet of evaporator, steam hair
The cyclic steam entrance of the gas outlet connection preheater of raw device.
8. the organic polluted soil low energy consumption thermal desorption according to claim 7-adsorbing coupled repair system of chilling-, special
Sign is：The gas vent of secondary condenser, in connect compressor air inlet, carries out the gas of participation secondary by vacuum pump
Absorption.
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