CN114101308A - System and method for restoring petroleum hydrocarbon polluted soil - Google Patents
System and method for restoring petroleum hydrocarbon polluted soil Download PDFInfo
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- CN114101308A CN114101308A CN202111351046.4A CN202111351046A CN114101308A CN 114101308 A CN114101308 A CN 114101308A CN 202111351046 A CN202111351046 A CN 202111351046A CN 114101308 A CN114101308 A CN 114101308A
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- 239000002689 soil Substances 0.000 title claims abstract description 79
- 239000003209 petroleum derivative Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000007789 gas Substances 0.000 claims abstract description 34
- 238000000197 pyrolysis Methods 0.000 claims abstract description 32
- 239000012528 membrane Substances 0.000 claims abstract description 29
- 239000002351 wastewater Substances 0.000 claims abstract description 19
- 239000003208 petroleum Substances 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims abstract description 15
- 238000004821 distillation Methods 0.000 claims abstract description 14
- 239000002918 waste heat Substances 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 238000005067 remediation Methods 0.000 claims description 10
- 238000000108 ultra-filtration Methods 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- 229920002521 macromolecule Polymers 0.000 claims description 7
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 235000012255 calcium oxide Nutrition 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000007667 floating Methods 0.000 claims description 5
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- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- 239000004021 humic acid Substances 0.000 claims description 3
- 230000000813 microbial effect Effects 0.000 claims description 3
- 239000012982 microporous membrane Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000010455 vermiculite Substances 0.000 claims description 3
- 229910052902 vermiculite Inorganic materials 0.000 claims description 3
- 235000019354 vermiculite Nutrition 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 23
- 229920006395 saturated elastomer Polymers 0.000 description 9
- 239000000243 solution Substances 0.000 description 6
- 238000004065 wastewater treatment Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 238000005979 thermal decomposition reaction Methods 0.000 description 5
- 150000001335 aliphatic alkanes Chemical class 0.000 description 4
- 150000001336 alkenes Chemical class 0.000 description 4
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- 125000003118 aryl group Chemical group 0.000 description 2
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- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 241000186361 Actinobacteria <class> Species 0.000 description 1
- 241000589151 Azotobacter Species 0.000 description 1
- 244000063299 Bacillus subtilis Species 0.000 description 1
- 235000014469 Bacillus subtilis Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 241000235342 Saccharomycetes Species 0.000 description 1
- 241000223259 Trichoderma Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000341 volatile oil Substances 0.000 description 1
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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
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mycology (AREA)
- Soil Sciences (AREA)
- Microbiology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Botany (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a system and a method for restoring petroleum hydrocarbon polluted soil, which comprises a pretreatment system for crushing and screening the polluted soil; a preheating chamber for preheating the screened polluted soil; a pyrolysis chamber for pyrolyzing the preheated polluted soil; tail gas in the preheating chamber and the pyrolysis chamber enters the hydrothermal heat exchanger; the tail gas in the hydrothermal heat exchanger enters the spray condensing tower; an oil-water separator for treating the sprayed waste water and an ultrafiltration-membrane distillation waste water system. The invention can efficiently remove pollutants in petroleum soil, and has high energy utilization rate and low energy consumption; the exhaust emission is reduced, the cost is saved, and simultaneously, the waste heat utilization efficiency is high.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a system and a method for remediating petroleum hydrocarbon contaminated soil.
Background
The petroleum may be leaked during the processes of exploitation, transportation, storage, use and the like, and the petroleum substance enters the soil, so that the physicochemical property of the soil can be changed. Since the biodegradation process of anaerobic bacteria in soil is very slow, the anaerobic bacteria can cause long-term threat to underground water. In addition, the light components of the volatile oil pollute the air, while the heavy components remaining in the soil hinder the recovery of vegetation for decades.
The petroleum soil remediation technologies which are most widely applied at present comprise biological remediation, chemical remediation and physical remediation. Compared with biological repair and chemical repair, physical thermal repair can effectively decompose organic matters in petroleum and completely remove pollutants in the petroleum. Thermal remediation includes incineration and thermal decomposition. Incineration requires a high-temperature aerobic environment, while thermal decomposition is performed in a relatively low-temperature anoxic environment, so that the method is an efficient and energy-saving treatment method.
The currently common ectopic thermal decomposition technology comprises an internal heating type and an external heating type, and the external heating type thermal decomposition technology adopts an indirect heating mode, so that the energy utilization rate is low and the energy consumption is high; the internal heating type thermal decomposition technology adopts direct heating, has high heat exchange efficiency, but has large tail gas amount, thereby improving the cost and having low waste heat utilization efficiency. Therefore, a system and a method for restoring soil polluted by petroleum hydrocarbon are provided for solving the problems.
Disclosure of Invention
The invention aims to provide a system and a method for restoring petroleum hydrocarbon polluted soil, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a petroleum hydrocarbon contaminated soil remediation system comprises a pretreatment system for crushing and screening contaminated soil;
a preheating chamber for preheating the screened polluted soil;
a pyrolysis chamber for pyrolyzing the preheated polluted soil;
tail gas in the preheating chamber and the pyrolysis chamber enters the hydrothermal heat exchanger;
the tail gas in the hydrothermal heat exchanger enters the spray condensing tower; set up condensing coil in the spray condensing tower, the intraductal injection of condensing coil has the comdenstion water, and the comdenstion water is the source and is the clean water after the waste water treatment equipment handles, and the temperature control is 60 ~ 90 ℃ after the heat transfer.
An oil-water separator for treating the sprayed waste water and an ultrafiltration-membrane distillation waste water system.
Preferably, the preheating chamber is preheated by a spiral propelling type drying furnace due to the fact that petroleum hydrocarbon polluted soil is high in viscosity.
Preferably, the combustion flue gas in the preheating chamber enters the air-cooled heat exchanger, and the hot air after heat exchange is used as combustion-supporting gas in the combustion chamber.
Preferably, the pyrolysis chamber adopts a fluidized bed type pyrolysis furnace, a jacket type screw conveyor is arranged at the output end of the pyrolysis furnace, and a hydrothermal heat exchange cavity is arranged in the jacket. The temperature of the superheated steam is 350-450 ℃, and the retention time is 20-60 min.
Preferably, the ultrafiltration-membrane distillation wastewater system comprises an ultrafiltration membrane treatment system, a heating treatment system and a membrane distillation treatment system.
A method for restoring petroleum hydrocarbon polluted soil comprises the following steps:
s1: removing large stones from the petroleum polluted soil, crushing and screening the petroleum polluted soil, adjusting the particle size to be less than 5cm, adding quicklime to adjust the water content of the soil to be 20-30%, wherein the addition amount of the quicklime is less than 1 wt% of the mass of the soil;
s2: conveying the screened polluted soil into a preheating chamber, and preheating the soil by adopting a spiral propelling type drying furnace; the combustion flue gas in the preheating chamber enters an air-cooled heat exchanger, and the hot air after heat exchange is used as combustion-supporting gas in the combustion chamber;
s3: conveying the preheated polluted soil into a pyrolysis chamber, and pyrolyzing by adopting a fluidized bed type pyrolysis furnace; the heat of the pyrolysis furnace comes from the superheated steam in the superheated pipe and heats the superheated pipe through the combustion chamber; in the pyrolysis repair process, saturated components in petroleum tend to be cracked into alkanes and alkenes with small molecular weights, the alkanes and the alkenes are removed in the form of cracked gas, aromatic components, colloid and asphaltene tend to be condensed to generate macromolecules, the macromolecules are finally remained in soil in the form of residual carbon to form carbon-based soil, and finally the carbon-based soil is output by a jacketed screw conveyor, wherein condensed water is injected into a hydrothermal heat exchange cavity in a jacket, the source of the condensed water is clean water after being treated by wastewater treatment equipment, the water temperature is controlled to be 60-90 ℃ after heat exchange, and the hot water is injected into a hydrothermal heat exchanger as a water supply source after heat exchange;
s4: discharging the pyrolyzed carbon-based soil, and taking the pyrolyzed carbon-based soil, turf, vermiculite, humic acid, bentonite and a compound microbial agent as raw materials of compound soil;
tail gas in the preheating chamber and the pyrolysis chamber enters a hydrothermal heat exchanger for waste heat recycling; generating saturated steam at 100-120 ℃ after heat exchange, wherein one part of the saturated steam enters a superheater pipe to be used as a superheated steam heating source, and the other part of the saturated steam is used as a heating source for wastewater treatment;
s5: tail gas after waste heat utilization of the hydrothermal heat exchanger enters a spraying condensing tower, and hot water generated by spraying flows back to the hydrothermal heat exchanger to serve as a water supply source;
washing acidic gas in a spray condensing tower by adopting an alkaline spray agent, and feeding non-condensable oil gas into a combustion chamber;
the wastewater and the oil phase enter an oil-water separator to separate macromolecule floating oil, and the separated oil phase enters a combustion chamber to be supplied as fuel;
s6: treating the residual micromolecular oil phase wastewater in the oil-water separator by an ultrafiltration membrane to remove micromolecular dispersed oil and part of emulsified oil;
then, after heating treatment, membrane distillation treatment is carried out, the steam pressure difference generated by the solution on the two sides of the membrane drives the water vapor generated by the solution to permeate through the hydrophobic microporous membrane, the water vapor is condensed and collected on the cold side of the membrane, and the concentrated emulsion returns to the feeding of the ultrafiltration equipment for secondary treatment;
the treated oil concentrate enters a fuel chamber;
the produced pure water is used as the water for replenishing and condensing the spray condensing tower.
Compared with the prior art, the invention has the beneficial effects that: the invention can efficiently remove pollutants in petroleum soil, and has high energy utilization rate and low energy consumption; the exhaust emission is reduced, the cost is saved, and simultaneously, the waste heat utilization efficiency is high.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
Detailed Description
The technical solution of the present invention will be described below with reference to the accompanying drawings and examples.
Referring to fig. 1, the present invention provides a technical solution: a petroleum hydrocarbon contaminated soil remediation system comprises a pretreatment system for crushing and screening contaminated soil; a preheating chamber for preheating the screened polluted soil; a pyrolysis chamber for pyrolyzing the preheated polluted soil; tail gas in the preheating chamber and the pyrolysis chamber enters the hydrothermal heat exchanger; the tail gas in the hydrothermal heat exchanger enters the spray condensing tower; an oil-water separator for treating the sprayed waste water and an ultrafiltration-membrane distillation waste water system. Wherein, set up condensing coil in the spray condensing tower, it has the comdenstion water to pour into in the condensing coil, and the comdenstion water is the source and is the clean water after waste water treatment equipment handles, and the temperature control is 60 ~ 90 ℃ after the heat transfer.
Because the contaminated soil has larger viscosity, the preheating chamber adopts a spiral propelling type drying furnace for preheating. In the preheating process, a material lock of the drying furnace is opened, a feeding motor is started to start uniform feeding, smoke enters from the tail part, the smoke is output from the head part, external heat type heat exchange is fully performed, external heat type preheating is performed on the pretreated polluted soil by using the waste heat of the tail gas, the waste heat of the smoke is controlled to be 350-450 ℃, and the temperature of the preheated soil is 90-120 ℃.
And the combustion flue gas in the preheating chamber enters the air-cooled heat exchanger, and the hot air after heat exchange is used as combustion-supporting gas in the combustion chamber.
Furthermore, the pyrolysis chamber adopts a fluidized bed type pyrolysis furnace, a jacket type screw conveyor is arranged at the output end of the pyrolysis furnace, and a hydrothermal heat exchange cavity is arranged in the jacket. The temperature of the superheated steam is 350-450 ℃, and the retention time is 20-60 min.
The soil remediation process is described in detail below with reference to the examples of the present invention:
removing large stones from the petroleum polluted soil, crushing and screening the petroleum polluted soil, adjusting the particle size to be less than 5cm, adding quicklime to adjust the water content of the soil to be 20-30%, wherein the addition amount of the quicklime is less than 1 wt% of the mass of the soil;
conveying the screened polluted soil into a preheating chamber, and preheating the polluted soil by adopting a spiral propelling type drying furnace; the combustion flue gas in the preheating chamber enters an air-cooled heat exchanger, and the hot air after heat exchange is used as combustion-supporting gas in the combustion chamber; the preheating chamber is used for improving the temperature of the polluted soil, preventing a large amount of condensed water from being generated when superheated steam is contacted with low-temperature materials, and reducing the energy consumption.
Conveying the preheated polluted soil into a pyrolysis chamber, and pyrolyzing by adopting a fluidized bed type pyrolysis furnace; the heat of the pyrolysis furnace comes from the superheated steam in the superheated pipe and heats the superheated pipe through the combustion chamber; in the pyrolysis repair process, saturated components in petroleum tend to be cracked into alkanes and alkenes with small molecular weights, the alkanes and the alkenes are removed in the form of cracked gas, aromatic components, colloid and asphaltene tend to be condensed to generate macromolecules, the macromolecules are finally remained in soil in the form of residual carbon to form carbon-based soil, and finally the carbon-based soil is output by a jacketed screw conveyor, wherein condensed water is injected into a hydrothermal heat exchange cavity in a jacket, the source of the condensed water is clean water after being treated by wastewater treatment equipment, the water temperature is controlled to be 60-90 ℃ after heat exchange, and the hot water is injected into a hydrothermal heat exchanger as a water supply source after heat exchange;
carbon-based soil, turf, vermiculite, humic acid, bentonite and a compound microbial agent (actinomycetes, azotobacter, bacillus subtilis, trichoderma, saccharomycetes and the like) are used as raw materials of the compound soil to improve the structure and the physical and chemical properties of the soil.
Tail gas in the preheating chamber and the pyrolysis chamber enters a hydrothermal heat exchanger for waste heat recycling; generating saturated steam at 100-120 ℃ after heat exchange, wherein one part of the saturated steam enters a superheater pipe to be used as a superheated steam heating source, and the other part of the saturated steam is used as a heating source for wastewater treatment;
it should be noted that: flue gas in the present invention refers to the gas produced by the combustion chamber. The tail gas is gas generated by pyrolysis of petroleum hydrocarbon soil or gas generated by mixing with superheated steam.
Tail gas after waste heat utilization of the hydrothermal heat exchanger enters a spraying condensing tower, and hot water generated by spraying flows back to the hydrothermal heat exchanger to serve as a water supply source;
washing acidic gas in a spray condensing tower by adopting an alkaline spray agent, and feeding non-condensable oil gas into a combustion chamber;
the wastewater and the oil phase enter an oil-water separator to separate macromolecule floating oil, and the separated oil phase enters a combustion chamber to be supplied as fuel;
the existing state of oil in water can be roughly divided into floating oil, dispersed oil and emulsified oil according to the size of oil drops, the floating oil with larger molecular weight is separated by an oil-water separator, and the residual micromolecular oil phase wastewater is treated by an ultrafiltration-membrane distillation wastewater system.
Treating the residual micromolecular oil phase wastewater in the oil-water separator by an ultrafiltration membrane to remove micromolecular dispersed oil and part of emulsified oil;
then, after heating treatment, membrane distillation treatment is carried out, the steam pressure difference generated by the solution on the two sides of the membrane drives the water vapor generated by the solution to permeate through the hydrophobic microporous membrane, the water vapor is condensed and collected on the cold side of the membrane, and the concentrated emulsion returns to the feeding of the ultrafiltration equipment for secondary treatment; the hydrophobic membrane component adopted by the membrane distillation can be a polytetrafluoroethylene membrane, a fiber membrane, a polyethylene membrane and the like. Saturated steam of 100-120 ℃ is adopted for direct heating, the temperature of the heated wastewater is controlled to be 80-90 ℃, on one hand, the purpose of heating and demulsification is achieved, and on the other hand, the purpose of generating steam pressure difference through membrane distillation is achieved.
The treated oil concentrate enters a fuel chamber;
the produced pure water is used as the water for replenishing and condensing the spray condensing tower.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The petroleum hydrocarbon contaminated soil remediation system comprises a pretreatment system for crushing and screening contaminated soil, and is characterized by further comprising:
a preheating chamber for preheating the screened polluted soil;
a pyrolysis chamber for pyrolyzing the preheated polluted soil;
tail gas in the preheating chamber and the pyrolysis chamber enters the hydrothermal heat exchanger;
the tail gas in the hydrothermal heat exchanger enters the spray condensing tower;
an oil-water separator for treating the sprayed waste water and an ultrafiltration-membrane distillation waste water system.
2. The system for remediating petroleum hydrocarbon contaminated soil as recited in claim 1, wherein: because the contaminated soil has larger viscosity, the preheating chamber adopts a spiral propelling type drying furnace for preheating.
3. The system for remediating petroleum hydrocarbon contaminated soil as recited in claim 1, wherein: and the combustion flue gas in the preheating chamber enters the air-cooled heat exchanger, and the hot air after heat exchange is used as combustion-supporting gas in the combustion chamber.
4. The system for remediating petroleum hydrocarbon contaminated soil as recited in claim 1, wherein: the pyrolysis chamber adopts a fluidized bed type pyrolysis furnace, the output end of the pyrolysis furnace is provided with a jacketed screw conveyor, and a water-heat exchange cavity is arranged in the jacket.
5. The system for remediating petroleum hydrocarbon contaminated soil as recited in claim 1, wherein: the ultrafiltration-membrane distillation wastewater system comprises an ultrafiltration membrane treatment system, a heating treatment system and a membrane distillation treatment system.
6. The method for restoring the petroleum hydrocarbon polluted soil is characterized by comprising the following steps:
s1: removing large stones from the petroleum polluted soil, crushing and screening the petroleum polluted soil, adjusting the particle size to be less than 5cm, adding quicklime to adjust the water content of the soil to be 20-30%, wherein the addition amount of the quicklime is less than 1 wt% of the mass of the soil;
s2: conveying the screened polluted soil into a preheating chamber, and preheating the polluted soil by adopting a spiral propelling type drying furnace; the combustion flue gas in the preheating chamber enters an air-cooled heat exchanger, and the hot air after heat exchange is used as combustion-supporting gas in the combustion chamber;
s3: conveying the preheated polluted soil into a pyrolysis chamber, and pyrolyzing by adopting a fluidized bed type pyrolysis furnace; the heat of the pyrolysis furnace comes from the superheated steam in the superheated pipe and heats the superheated pipe through the combustion chamber;
s4: discharging the pyrolyzed carbon-based soil, and taking the pyrolyzed carbon-based soil, turf, vermiculite, humic acid, bentonite and a compound microbial agent as raw materials of compound soil;
tail gas in the preheating chamber and the pyrolysis chamber enters a hydrothermal heat exchanger for waste heat recycling;
s5: tail gas after waste heat utilization of the hydrothermal heat exchanger enters a spraying condensing tower, and hot water generated by spraying flows back to the hydrothermal heat exchanger to serve as a water supply source;
washing acidic gas in a spray condensing tower by adopting an alkaline spray agent, and feeding non-condensable oil gas into a combustion chamber;
the wastewater and the oil phase enter an oil-water separator to separate macromolecule floating oil, and the separated oil phase enters a combustion chamber to be supplied as fuel;
s6: treating the residual micromolecular oil phase wastewater in the oil-water separator by an ultrafiltration membrane to remove micromolecular dispersed oil and part of emulsified oil;
then, after heating treatment, membrane distillation treatment is carried out, the steam pressure difference generated by the solution on the two sides of the membrane drives the water vapor generated by the solution to permeate through the hydrophobic microporous membrane, the water vapor is condensed and collected on the cold side of the membrane, and the concentrated emulsion returns to the feeding of the ultrafiltration equipment for secondary treatment;
the treated oil concentrate enters a fuel chamber;
the produced pure water is used as the water for replenishing and condensing the spray condensing tower.
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