CN112958613A - In-situ thermal desorption system for repairing organic contaminated soil - Google Patents
In-situ thermal desorption system for repairing organic contaminated soil Download PDFInfo
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- CN112958613A CN112958613A CN202110254891.3A CN202110254891A CN112958613A CN 112958613 A CN112958613 A CN 112958613A CN 202110254891 A CN202110254891 A CN 202110254891A CN 112958613 A CN112958613 A CN 112958613A
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- 239000002689 soil Substances 0.000 title claims abstract description 178
- 238000003795 desorption Methods 0.000 title claims abstract description 70
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 144
- 238000000605 extraction Methods 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000011084 recovery Methods 0.000 claims abstract description 54
- 239000002918 waste heat Substances 0.000 claims abstract description 54
- 239000000446 fuel Substances 0.000 claims abstract description 29
- 239000002912 waste gas Substances 0.000 claims abstract description 25
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims abstract description 14
- 238000011066 ex-situ storage Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 32
- 238000002485 combustion reaction Methods 0.000 claims description 29
- 239000004568 cement Substances 0.000 claims description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 14
- 239000003546 flue gas Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 239000003345 natural gas Substances 0.000 claims description 8
- 238000005067 remediation Methods 0.000 claims description 8
- 238000009412 basement excavation Methods 0.000 claims description 7
- 239000002283 diesel fuel Substances 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 6
- 208000034189 Sclerosis Diseases 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 230000008439 repair process Effects 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 description 8
- 231100000719 pollutant Toxicity 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
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- 238000004861 thermometry Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
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- 230000004888 barrier function Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- B09C2101/00—In situ
Abstract
The invention discloses an in-situ thermal desorption system for repairing organic contaminated soil, which comprises a heating and energy supplying unit, an extraction unit, a waste gas treatment unit, a wastewater treatment unit, a monitoring and control unit and a soil body unit to be repaired; the heating power supply unit includes: the device comprises a fuel storage tank, fuel conveying equipment, a burner, a heating pipe and a waste heat recovery heating pipe; the extraction unit comprises an extraction pipe, a primary gas-water separator, a cooling tower, a secondary gas-water separator and an extraction vacuum pump; the soil body unit to be restored is divided into an in-situ horizontal soil body unit and an ex-situ pile type soil body unit according to different positions. The in-situ thermal desorption system for repairing the organic polluted soil, provided by the invention, has the advantages of simple system structure, mature facility equipment, easiness in operation, good repair effect, high energy efficiency and the like, and can be used for in-situ horizontal thermal desorption repair treatment or in-situ ex-situ pile type thermal desorption repair treatment of the organic polluted soil.
Description
Technical Field
The invention relates to an in-situ thermal desorption treatment system suitable for repairing organic contaminated soil in the technical field of contaminated soil repair, in particular to an in-situ horizontal thermal desorption treatment system or in-situ ex-situ pile type thermal desorption treatment system for repairing the organic contaminated soil.
Background
With the continuous promotion of the investigation work of the soil pollution condition of the domestic construction land, the scale of the remediation of the organic polluted soil is increased day by day, and the thermal desorption remediation technology is one of the important technical means for the remediation of the organic polluted soil, particularly the organic heavily polluted soil. The thermal desorption technology heats the soil to a certain temperature in a direct or indirect heating mode, so that organic pollutant components are heated and volatilized and are separated from a soil medium, and then the volatilized pollutants are effectively collected and treated, so that the aim of soil remediation is fulfilled.
The thermal desorption repair process modes widely adopted at present mainly comprise in-situ vertical thermal desorption and ex-situ equipment thermal desorption. The in-situ vertical thermal desorption technology is relatively mature in process and large in processing scale, but has poor applicability to plots with shallow pollution depth; the heterotopic equipment type thermal desorption technology is mature, but the equipment investment cost is large, the requirement on soil pretreatment is high, the requirement is limited by the equipment treatment capacity, and all polluted soil cannot be repaired simultaneously when the repair earthwork amount is large.
Disclosure of Invention
The invention aims to provide an in-situ horizontal or ex-situ pile type in-situ thermal desorption soil remediation system for treating volatile/semi-volatile organic compounds or petroleum polluted soil, which solves the problem that the existing thermal desorption technology has poor applicability to certain polluted plots.
In order to achieve the aim, the invention provides an in-situ thermal desorption system for repairing organic contaminated soil, wherein the system comprises a heating energy supply unit, an extraction unit, a waste gas treatment unit, a wastewater treatment unit, a monitoring control unit and a soil body unit to be repaired; the heating and energy supplying unit comprises: the device comprises a fuel storage tank, fuel conveying equipment, a burner, a heating pipe and a waste heat recovery heating pipe; the extraction unit comprises an extraction pipe, a primary gas-water separator, a cooling tower, a secondary gas-water separator and an extraction vacuum pump; the soil body unit to be repaired is divided into an in-situ horizontal soil body unit and an ex-situ pile type soil body unit according to different positions.
Foretell an original place thermal desorption system for organic contaminated soil is restoreed, wherein, heating energy supply unit in, fuel conveying equipment contains pipeline, a plurality of combustors are connected in parallel through pipeline in the one end of homonymy and are connected with the fuel storage tank again, the other end of combustor is equipped with the combustion chamber, the other end and the heating pipe of combustion chamber are connected, the low reaches and the waste heat recovery heating pipe of heating pipe are connected, the other end of waste heat recovery heating pipe is equipped with the collecting pipe, the collecting pipe is connected with the emission fan, the other end of emission fan is equipped with burning waste gas aiutage.
Foretell an original place thermal desorption system for organic contaminated soil is restoreed, wherein, heating energy supply unit in, diesel oil or natural gas are stored to the fuel storage tank, distribute to each combustor in through pipeline, fuel in the combustor spouts forms droplet or gas in the combustion chamber through the nozzle, mix with the combustion chamber air, produce high temperature flue gas after igniting through the combustor, high temperature flue gas passes through the pipeline and gets into heating pipe and its low reaches waste heat recovery heating pipe, reach the heat transfer effect through indirect contact with soil, high temperature flue gas tail gas after the burning is discharged into the atmosphere through collecting.
The in-situ thermal desorption system for restoring the organic contaminated soil is characterized in that in the extraction unit, one end of the extraction pipe is positioned in the soil body unit to be restored, the other end of the extraction pipe is connected with the first-stage gas-water separator, the first-stage gas-water separator is sequentially connected with the cooling tower and the second-stage gas-water separator, the second-stage gas-water separator is sequentially connected with the extraction vacuum pump and the waste gas treatment unit, and the tail end of the waste gas treatment unit is provided with the thermal desorption waste gas exhaust funnel.
The in-situ thermal desorption system for restoring the organic contaminated soil is characterized in that the primary gas-water separator and the secondary gas-water separator are respectively connected with the water collecting tank through pipelines, the water collecting tank discharges waste liquid into the wastewater treatment unit through the water pump, and the tail end of the wastewater treatment unit is provided with a discharge water tank after treatment.
In the in-situ thermal desorption system for repairing the organic contaminated soil, the monitoring and controlling unit is provided with a controller and a plurality of monitoring devices, and is used for monitoring and controlling various repairing process parameters including temperature, pressure, flow and liquid level; the monitoring equipment comprises a thermocouple temperature measuring sensor.
In the in-situ thermal desorption system for repairing the organic contaminated soil, in the soil body unit to be repaired, the in-situ horizontal soil body unit is a soil body which is integrally lower than the ground and has the top basically flush with the surrounding ground; the ectopic pile type soil body unit is a soil body which is piled on the ground after ectopic excavation.
In the in-situ thermal desorption system for repairing the organic contaminated soil, a plurality of heating pipes, waste heat recovery heating pipes, extraction pipes and thermocouple temperature sensors which are layered and horizontally arranged are respectively paved in the soil body unit to be repaired; all there is the cement sclerosis layer soil body outside all around and the top, and the thickness on cement sclerosis layer is more than or equal to 100 mm.
The in-situ thermal desorption system for restoring the organic contaminated soil is characterized in that in the soil body unit to be restored, one ends of the heating pipe, the waste heat recovery heating pipe, the extraction pipe and the thermocouple temperature sensor respectively extend out of the side wall of the cement hardened layer, the heating pipe is connected with the burner, the inlet of the waste heat recovery heating pipe is connected with the outlet of the heating pipe, and the outlet of the extraction pipe is connected with the primary gas-water separator in the extraction unit.
In the in-situ thermal desorption system for restoring the organic contaminated soil, the heating pipe and the waste heat recovery heating pipe are both metal pipes; the extraction pipe is horizontally arranged in parallel and is arranged in parallel with the heating pipe and the waste heat recovery heating pipe, and the extraction pipe is a metal pipe with sieve pores distributed on the pipe wall; temperature thermocouples of the thermocouple temperature measuring sensors are evenly distributed in different areas and depths of the whole soil body to be repaired and cover cold points in the soil body.
The in-situ thermal desorption system for repairing the organic contaminated soil provided by the invention has the following advantages:
this patent provides a contaminated soil original place thermal desorption repairing's new form, according to restoreing on-the-spot actual conditions, can adopt construction methods such as ditching pipe laying, push pipe or horizontal directional drilling tubulation to carry out original place horizontal thermal desorption to restore shallow layer contaminated soil, also can make the soil pile body that can supply heat desorption operation after the contaminated soil excavation, carries out original place ectopic concentrated pile formula thermal desorption restoration.
Drawings
Fig. 1 is a schematic structural diagram of an in-situ horizontal soil body unit form of the in-situ thermal desorption system for remediating the organically-polluted soil according to the present invention.
Fig. 2 is a schematic structural diagram of an ex-situ stacked soil body unit form of the in-situ thermal desorption system for remediating organic contaminated soil according to the present invention.
Fig. 3 is a schematic diagram showing the arrangement and connection of the heating pipe, the waste heat recovery heating pipe and the extraction pipe of the in-situ thermal desorption system for repairing the organic contaminated soil.
Fig. 4 is a schematic sectional view of pipeline arrangement of a repaired soil region in the form of an in-situ horizontal soil body unit of the in-situ thermal desorption system for repairing organic contaminated soil according to the present invention.
Fig. 5 is a schematic cross-sectional view of the pipeline arrangement of the remediation soil area in the form of the ectopic pile type soil body unit of the in-situ thermal desorption system for remediating the organic contaminated soil.
Fig. 6 is a schematic cross-sectional view of a single heat exchange and extraction assembly in a repaired soil area in the form of an in-situ horizontal soil body unit of the in-situ thermal desorption system for repairing organic contaminated soil according to the present invention.
Fig. 7 is a schematic cross-sectional view of a single heat exchange and extraction assembly in a remediation soil area in the form of an ex-situ stack type soil body unit of the in-situ thermal desorption system for remediating organic contaminated soil according to the present invention.
Wherein: 1. a heating and energy supplying unit; 2. a fuel storage tank; 3. a metal connection hose; 4. a waste heat recovery heating pipe; 5. an extraction pipe; 6. a collection pipe; 7. a combustion exhaust stack; 8. a first-stage gas-water separator; 9. an extraction vacuum pump; 10. a cooling tower; 11. an exhaust gas treatment unit; 12. a thermal desorption exhaust gas exhaust cylinder; 13. a water collecting tank; 14. a water pump; 15. a wastewater treatment unit; 16. discharging the treated water pool; 17. a soil body unit to be repaired; 18. a horizontal ground; 19. the side wall of the foundation pit; 20. a burner; 21. a combustion chamber; 22. a thermocouple temperature sensor; 23. heating a tube; 24. a working surface at the bottom of the foundation pit; 25. a hardened cement layer; 26. a bottom concrete barrier layer; 27. a discharge fan; 28. a second-stage gas-water separator.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 7, the in-situ thermal desorption system for repairing organic contaminated soil provided by the invention comprises a heating and energy supply unit 1, an extraction unit, a waste gas treatment unit 11, a wastewater treatment unit 15, a monitoring and control unit and a soil body unit to be repaired 17; the heating power supply unit 1 includes: the device comprises a fuel storage tank 2, fuel conveying equipment, a burner 20, a heating pipe 23 and a waste heat recovery heating pipe 4; the extraction unit comprises an extraction pipe 5, a primary gas-water separator 8, a cooling tower 10, a secondary gas-water separator 28 and an extraction vacuum pump 9; the soil body unit 17 to be repaired is divided into an in-situ horizontal soil body unit and an ex-situ pile soil body unit according to different positions.
In the heating energy supply unit 1, fuel conveying equipment contains pipeline, a plurality of combustors 20 are connected with fuel storage tank 2 in parallel through pipeline in the one end of homonymy again, combustor 20's the other end is equipped with combustion chamber 21, combustion chamber 21's the other end is connected with heating pipe 23, heating pipe 23's low reaches are connected with waste heat recovery heating pipe 4, waste heat recovery heating pipe 4's the other end is equipped with collecting pipe 6, collecting pipe 6 is connected with emission fan 27, emission fan 27's the other end is equipped with burning waste gas aiutage 7.
In the heating energy supply unit 1, diesel oil or natural gas are stored to fuel storage tank 2, distribute to each combustor 20 in through the delivery pipeline, fuel spouts through the nozzle in the combustor 20 forms droplet or gas in the combustion chamber 21, mix with the air in the combustion chamber 21, produce high temperature flue gas after combustor 20 ignitions and ignites, high temperature flue gas passes through the pipeline and gets into heating pipe 23 and waste heat recovery heating pipe 4 of its low reaches, reach the heat transfer effect through indirect contact with soil, high temperature flue gas tail gas after the burning is discharged the atmosphere through collecting.
In the extraction unit, one end of an extraction pipe 5 is positioned in a soil body unit 17 to be repaired, the other end of the extraction pipe is connected with a primary gas-water separator 8, the primary gas-water separator 8 is sequentially connected with a cooling tower 10 and a secondary gas-water separator 28, the secondary gas-water separator 28 is sequentially connected with an extraction vacuum pump 9 and an exhaust gas treatment unit 11, and the tail end of the exhaust gas treatment unit 11 is provided with a thermal desorption exhaust gas exhaust funnel 12.
The first-stage gas-water separator 8 and the second-stage gas-water separator 28 are respectively connected with a water collecting tank 13 through pipelines, the water collecting tank 13 discharges waste liquid into a wastewater treatment unit 15 through a water pump 14, and a treated discharge water tank 16 is arranged at the tail end of the wastewater treatment unit 15.
The monitoring control unit is provided with a controller and a plurality of monitoring devices, which are all existing elements and are used for monitoring and controlling various repairing process parameters including temperature, pressure, flow and liquid level; the monitoring device includes a thermocouple thermometry sensor 22.
In the soil body unit to be repaired 17, the in-situ horizontal soil body unit is a soil body which is wholly lower than the ground and the top of which is basically level with the surrounding ground; the ectopic pile type soil body unit is a soil body which is piled on the ground after ectopic excavation.
A plurality of layered and horizontally placed heating pipes 23, a waste heat recovery heating pipe 4, an extraction pipe 5 and a thermocouple temperature sensor 22 are respectively paved in the soil body unit to be repaired 17; the periphery and the top of the outer side of the soil body are covered with cement hardened layers 25. The thickness of the cement hardened layer 25 is 100mm or more.
In the soil body unit 17 to be repaired, one ends of the heating pipe 23, the waste heat recovery heating pipe 4, the extraction pipe 5 and the thermocouple temperature sensor 22 respectively extend out of the side wall of the cement hardened layer 25, the heating pipe 23 is connected with the burner 20, the inlet of the waste heat recovery heating pipe 4 is connected with the outlet of the heating pipe 23, and the outlet of the extraction pipe 5 is connected with the primary gas-water separator 8 in the extraction unit.
The heating pipe 23 and the waste heat recovery heating pipe 4 are both metal pipes; the extraction pipe 5 is horizontally arranged in parallel and is arranged in parallel with the heating pipe 23 and the waste heat recovery heating pipe 4, and the extraction pipe 5 is a metal pipe with sieve pores distributed on the pipe wall; the temperature thermocouples of the thermocouple temperature sensors 22 are evenly distributed in different areas and depths of the whole soil body to be repaired and cover cold points in the soil body.
The in-situ thermal desorption system for remediating the organically-polluted soil provided by the present invention will be further described with reference to the following examples.
Example 1
An in-situ thermal desorption system for repairing organic contaminated soil mainly comprises a heating energy supply unit 1, an extraction unit, a waste gas treatment unit 11, a wastewater treatment unit 15, a monitoring control unit and a soil body unit 17 to be repaired.
The heating power supply unit 1 includes: fuel storage tank 2, fuel delivery equipment, burner 20, heating pipe 23 and waste heat recovery heating pipe 4. The heating mode in the heating energy supply unit 1 is heat conduction indirect heating, and fuel oil or natural gas combustion is adopted as a heat source.
Fuel conveying equipment contains pipeline, a plurality of combustors 20 are connected with fuel storage tank 2 through pipeline parallelly connected again in the one end of homonymy, the other end of combustor 20 is equipped with combustion chamber 21, the other end and the heating pipe 23 of combustion chamber 21 are connected, the low reaches of heating pipe 23 are passed through metal connecting hose 3 and are connected with waste heat recovery heating pipe 4, preferably three heating pipe 23 is connected with same waste heat recovery heating pipe 4, the other end of waste heat recovery heating pipe 4 is equipped with collecting pipe 6, collecting pipe 6 is connected with exhaust fan 27, the other end of exhaust fan 27 is equipped with burning exhaust stack 7.
The fuel storage tank 2 stores diesel oil or natural gas, the diesel oil or natural gas is distributed into each combustor 20 through a conveying pipeline, fuel in the combustor 20 is sprayed into a combustion chamber 21 through a nozzle to form fog drops or gas, the fog drops or the gas are mixed with air in the combustion chamber 21, high-temperature flue gas is generated after ignition and ignition of the combustor 20, the high-temperature flue gas enters a heating pipe 23 and a waste heat recovery heating pipe 4 at the downstream of the heating pipe through pipelines, the heat exchange effect is achieved through indirect contact with soil, and high-temperature flue gas tail gas after combustion is collected and exhausted into the atmosphere.
The extraction unit comprises an extraction pipe 5, a primary gas-water separator 8, a cooling tower 10, namely an evaporative condenser, a secondary gas-water separator 28 and an extraction vacuum pump 9, namely an extraction fan.
One end of the extraction pipe 5 is positioned in the soil body unit 17 to be repaired, the other end is connected with a primary gas-water separator 8, the primary gas-water separator 8 is sequentially connected with a cooling tower 10 and a secondary gas-water separator 28, the secondary gas-water separator 28 is sequentially connected with an extraction vacuum pump 9 and a waste gas treatment unit 11, and the tail end of the waste gas treatment unit 11 is provided with a thermal desorption waste gas exhaust funnel 12. The first-stage gas-water separator 8 and the second-stage gas-water separator 28 are respectively connected with a water collecting tank 13 through pipelines, the water collecting tank 13 discharges waste liquid into a wastewater treatment unit 15 through a water pump 14, and a treated discharge water tank 16 is arranged at the tail end of the wastewater treatment unit 15.
The extraction pipe 5 is positioned at one end in the soil body unit 17 to be repaired, volatile pollutants in soil are extracted under the condition of negative pressure, extracted waste gas enters the primary gas-water separator 8, part of gas is condensed at normal temperature to form liquid drops and is collected at the bottom of the separator, the rest non-condensable gas enters the cooling tower 10 to be further cooled, the liquid is continuously condensed into liquid after the temperature is reduced and is separated in the secondary gas-water separator 28, and finally the rest non-condensable gas is connected into the waste gas treatment unit 11.
The monitoring control unit is provided with a controller and a plurality of monitoring devices, and is used for monitoring and controlling various repairing process parameters including temperature, pressure, flow, liquid level and the like; the monitoring device includes a thermocouple thermometry sensor 22.
The waste gas treatment unit 11 and the waste water treatment unit 15 are carried out according to a conventional waste gas and waste water treatment mode, and can relate to treatment processes such as activated carbon adsorption, coagulating sedimentation, chemical oxidation and the like.
The exhaust gas treatment unit 11 may use activated carbon as an adsorbent, and the pollutants are adsorbed and removed and then discharged into the atmosphere through the thermal desorption exhaust gas discharge pipe 12.
The wastewater treatment unit 15 receives the liquid condensed in the gas-liquid separator including the first-stage gas-water separator 8 and the second-stage gas-water separator 28, and can remove pollutants in wastewater by adopting single or combined processes such as coagulating sedimentation, chemical oxidation, activated carbon adsorption and the like, and finally reaches the standard to be discharged.
The soil body unit 17 to be repaired is divided into an in-situ horizontal soil body unit and an ex-situ pile soil body unit according to different positions.
The in-situ horizontal soil body unit is a soil body which is integrally lower than the ground and the top of which is basically level with the surrounding ground; the ectopic pile type soil body unit is a soil body which is piled on the ground after ectopic excavation.
In the in-situ horizontal soil body unit, the soil body is in situ in the repairing stage, and only a small amount of soil is excavated during the repairing period, so that large-area excavation of earthwork is avoided, and the repairing occupied area is smaller; ectopic pile type soil body unit needs to be repaired on cement hardening ground after soil excavation to prevent pollutants from leaking to the ground below from the exposed ground.
A plurality of layered and horizontally placed heating pipes 23, a waste heat recovery heating pipe 4, an extraction pipe 5 and a thermocouple temperature sensor 22 are respectively paved in the soil body unit to be repaired 17; the periphery and the top of the outer side of the soil body are covered with cement hardened layers 25, namely concrete shell heat-insulating layers. The thickness of the cement hardened layer 25 is more than or equal to 100mm, and the functions of heat preservation and insulation, pollutant permeation and dispersion prevention and rainwater entering can be achieved.
One end of the heating pipe 23, the waste heat recovery heating pipe 4, the extraction pipe 5 and the thermocouple temperature sensor 22 respectively extend out of the side wall of the cement hardened layer 25, the heating pipe 23 is connected with the combustor 20, the inlet of the waste heat recovery heating pipe 4 is connected with the outlet of the heating pipe 23, and the outlet of the extraction pipe 5 is connected with the primary gas-water separator 8 in the extraction unit.
The heating pipe 23 and the waste heat recovery heating pipe 4 are both metal pipes, and are made of metal materials to achieve a good heat exchange effect; the extraction pipe 5 is horizontally arranged in parallel and is arranged in parallel with the heating pipe 23 and the waste heat recovery heating pipe 4, and the extraction pipe 5 is a metal pipe with sieve pores distributed on the pipe wall; the temperature thermocouples of the thermocouple temperature sensor 22 are distributed evenly over different areas and depths of the whole soil body to be restored as far as possible, and cover cold spots in the soil body.
Example 2
When a soil body unit 17 to be repaired is in an in-situ horizontal soil body unit form, the in-situ thermal desorption system mainly comprises the following construction steps:
step 1, paying off to determine a boundary of soil to be repaired, excavating outwards and downwards from a horizontal ground 18 in a region to be repaired, forming a foundation pit and a central island-shaped soil body after excavating, wherein the central soil body is in-situ soil to be repaired, a working surface is formed after the peripheral ground is flat, namely a working surface 24 at the bottom of the foundation pit, and a foundation pit side wall 19 is formed between the working surface and the horizontal ground 18.
And 4, constructing a cement hardened layer 25 on the periphery and the top of the outer wall of the soil body unit 17 to be repaired.
And 5, connecting pipelines on the outer wall of the soil body unit 17 to be repaired and building a related monitoring control unit.
The to-be-repaired soil body unit 17 is an ectopic pile type soil body unit, namely, when the to-be-repaired soil body unit is located above the ground in a form of a soil body unit, the in-situ thermal desorption system is mainly constructed by the following steps:
the method comprises the following steps of firstly, defining an area beside a soil area to be repaired of a land parcel for building soil body units and placing materials of repair related equipment.
And step two, performing hardening/seepage-proofing construction on the ground at the bottom of the unit area of the soil body to be built, and paving a bottom concrete seepage-proofing layer 26.
And thirdly, paving a soil layer to be repaired with a certain thickness in the bottom area in advance.
And fourthly, paving a heating pipe 23, a waste heat recovery heating pipe 4, an extraction pipe 5 and a thermocouple temperature measuring sensor 22 above the soil layer.
And step five, covering a layer of soil layer above the pipe fitting material.
Step six, the heating pipes 23, the waste heat recovery heating pipes 4, the extraction pipes 5, the thermocouple temperature measurement sensors 22 and the soil layer are sequentially laid until the heating pipes are laid to the planned height, in the laying process, all the pipe fittings are laid in parallel along the pile body direction, the pipe fittings on the same height layer are arranged at intervals, the extraction pipes 5 and the heating pipes 23 or the waste heat recovery heating pipes 4 exist in an associated mode, the intervals among the pipe fittings are determined according to the effective heating range during heat exchange, construction operability, economical efficiency and other factors, and the situation that the repairing effect is poor due to the fact that the heating temperature is not high in the heating pipes 23 and the soil of the pipe fittings of the waste heat recovery heating pipes 4 at the too far intervals is avoided.
And seventhly, constructing the cement hardened layer 25 on the periphery and the top of the outer wall of the soil body unit 17 to be repaired.
And step eight, connecting pipelines on the outer wall of the soil body unit 17 to be repaired and building a related monitoring control unit.
Example 3
An in-situ thermal desorption system for remediating organically-polluted soil, which is operated in an opening sequence of: the extraction unit, the waste gas treatment unit 11 and the waste water treatment unit 15 are started firstly, and then the heating energy supply unit 1 is started; the closing sequence is opposite to the sequence, the heating energy supply unit 1 is closed firstly, and the extraction unit, the waste gas treatment unit 11 and the waste water treatment unit 15 are arranged after the soil body unit is cooled.
When the in-situ thermal desorption system operates, the action process of the extraction unit is as follows: starting a waste gas treatment unit 11 and a waste water treatment unit 15, starting diaphragm pumps in a primary gas-water separator 8 and a secondary gas-water separator 28, discharging accumulated water at the bottoms of the primary gas-water separator 8 and the secondary gas-water separator 28 into the waste water treatment unit 15 in time, and starting an extraction vacuum pump (fan) 9 and a cooling tower 10; high-temperature gas with pollutants is volatilized from the soil body unit to be repaired 17, the high-temperature gas enters the first-stage gas-water separator 8 under a negative pressure environment, part of the gas is condensed in the first-stage gas-water separator 8, the rest of the gas enters the circulating cooling tower 10 under the action of the extraction vacuum pump 9 for cooling, the condensed liquid is collected at the bottom of the second-stage gas-water separator 28 and is discharged to a wastewater collection pool, namely a water collection pool 13, in the wastewater treatment unit 15 through a diaphragm pump, the rest of the non-condensable gas enters the exhaust gas treatment unit 11 for further treatment, and the treated gas is finally discharged to the atmosphere through the thermal desorption exhaust gas exhaust pipe 12.
The heating energy supply unit 1 has the following action processes: firstly, a combustion waste gas discharge fan (vacuum pump) 27 is started to enable the heating pipe 23 and the waste heat recovery heating pipe 4 communicated by the metal connecting hose 3 to be kept in a negative pressure state, then fuel is distributed to each combustor 20 outside the pile body along a pipeline through a monitoring control unit, the combustor 20 is started, the fuel enters the combustion chamber 21 in a fog drop form or a gas form and is uniformly mixed with air entering the combustion chamber 21 under the negative pressure condition, high-temperature smoke is generated after combustion, the high-temperature smoke indirectly heats surrounding soil along the heating pipe 23, the temperature of the high-temperature smoke at the outlet of the heating pipe 23 is reduced, the heat exchange efficiency can be improved by utilizing a plurality of waste heat recovery heating pipes 4 arranged in the soil body unit 17 to be repaired, energy is saved, the high-temperature smoke at the outlets of a plurality of the heating pipes 23 is combined and enters the waste heat recovery heating pipe 4 to continuously and, then, the flue gas after heat exchange flows out from the other end of the waste heat recovery heating pipe 4, and is discharged to the atmosphere from the combustion waste gas exhaust funnel 7 at high altitude under the action of the combustion waste gas discharge fan 27.
The invention provides an in-situ thermal desorption system for repairing organic contaminated soil, which mainly comprises a heating and energy supplying unit 1, an extraction unit, a waste gas treatment unit 11, a waste water treatment unit 15, a monitoring and control unit and a soil body unit 17 to be repaired. The heating and energy supplying unit 1 comprises combustion heat generating equipment, a plurality of layered and horizontally parallel heating pipes 23 and a waste heat recovery heating pipe 4; the extraction unit comprises an extraction vacuum pump 9 and a plurality of extraction pipes 5 which are arranged in the soil body in a layered and horizontal parallel manner; a plurality of heating pipes 23, a waste heat recovery heating pipe 4, an extraction pipe 5 and a temperature monitoring component are arranged in the soil body unit 17 to be repaired; the pollutants extracted from the polluted soil are treated by the wastewater treatment unit 15 and the waste gas treatment unit 11 and then are discharged after reaching standards.
The in-situ thermal desorption system for repairing the organic contaminated soil provided by the invention is a solution for in-situ thermal desorption treatment and repair of the contaminated soil, and has the outstanding characteristics of capability of taking conventional diesel oil or natural gas as an energy source, easiness in obtaining energy sources, high utilization efficiency, simple and reliable system equipment composition, high thermal desorption temperature, long thermal desorption duration, good repair effect, strong adaptability to site conditions and the like.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. An in-situ thermal desorption system for repairing organic contaminated soil is characterized by comprising a heating and energy supply unit, an extraction unit, a waste gas treatment unit, a wastewater treatment unit, a monitoring and control unit and a soil body unit to be repaired;
the heating and energy supplying unit comprises: the device comprises a fuel storage tank, fuel conveying equipment, a burner, a heating pipe and a waste heat recovery heating pipe;
the extraction unit comprises an extraction pipe, a primary gas-water separator, a cooling tower, a secondary gas-water separator and an extraction vacuum pump;
the soil body unit to be repaired is divided into an in-situ horizontal soil body unit and an ex-situ pile type soil body unit according to different positions.
2. The in-situ thermal desorption system for remediating organic contaminated soil as claimed in claim 1, wherein in the heating and energy supplying unit, the fuel conveying equipment comprises a conveying pipeline, one end of the plurality of burners on the same side is connected in parallel through the conveying pipeline and then connected with the fuel storage tank, the other end of the burners is provided with a combustion chamber, the other end of the combustion chamber is connected with a heating pipe, the downstream of the heating pipe is connected with a waste heat recovery heating pipe, the other end of the waste heat recovery heating pipe is provided with a collecting pipe, the collecting pipe is connected with an exhaust fan, and the other end of the exhaust fan is provided with a combustion exhaust funnel.
3. The in-situ thermal desorption system for remediating organic contaminated soil as claimed in claim 2, wherein in the heating and energy supplying unit, the fuel storage tank stores diesel oil or natural gas, the diesel oil or natural gas is distributed into each combustor through a conveying pipeline, the fuel in the combustor is sprayed into the combustion chamber through the nozzle to form fog drops or gas, the fog drops or gas are mixed with air in the combustion chamber, the high-temperature flue gas is ignited and ignited by the combustor to generate high-temperature flue gas, the high-temperature flue gas enters the heating pipe and the downstream waste heat recovery heating pipe through the pipeline, the heat exchange effect is achieved through indirect contact with soil, and the tail gas of the high-temperature flue gas after combustion is collected and exhausted to the.
4. The in-situ thermal desorption system for remediating organically-polluted soil as claimed in claim 1, wherein the extraction unit comprises an extraction pipe having one end located in the unit of the soil to be remediated and the other end connected to a primary gas-water separator, the primary gas-water separator is connected to a cooling tower and a secondary gas-water separator, the secondary gas-water separator is connected to an extraction vacuum pump and an exhaust gas treatment unit, and the exhaust gas treatment unit is provided with a thermal desorption exhaust gas exhaust funnel at the end.
5. The in-situ thermal desorption system for remediating organically-polluted soil as claimed in claim 4, wherein the primary gas-water separator and the secondary gas-water separator are respectively connected with a water collecting tank through pipelines, the water collecting tank discharges the waste liquid into the wastewater treatment unit through a water pump, and a post-treatment discharge water tank is arranged at the tail end of the wastewater treatment unit.
6. The in-situ thermal desorption system for remediating the organically-polluted soil as claimed in claim 1, wherein the monitoring and controlling unit is provided with a controller and a plurality of monitoring devices for monitoring and controlling various remediation process parameters including temperature, pressure, flow and liquid level; the monitoring equipment comprises a thermocouple temperature measuring sensor.
7. The in-situ thermal desorption system for remediating organically-polluted soil as claimed in claim 1, wherein the in-situ horizontal soil body unit in the soil body unit to be remediated is a soil body which is lower than the ground as a whole and has a top substantially level with the surrounding ground; the ectopic pile type soil body unit is a soil body which is piled on the ground after ectopic excavation.
8. The in-situ thermal desorption system for remediating the organically-polluted soil as claimed in claim 7, wherein a plurality of layered and horizontally-placed heating pipes, waste heat recovery heating pipes, extraction pipes and thermocouple temperature sensors are respectively laid in the soil body unit to be remediated; all there is the cement sclerosis layer soil body outside all around and the top, and the thickness on cement sclerosis layer is more than or equal to 100 mm.
9. The in-situ thermal desorption system for remediating organic contaminated soil as claimed in claim 8, wherein in the soil body unit to be remediated, one end of the heating pipe, the waste heat recovery heating pipe, the extraction pipe and the thermocouple temperature sensor respectively extend out of the side wall of the cement hardened layer, the heating pipe is connected with the burner, the inlet of the waste heat recovery heating pipe is connected with the outlet of the heating pipe, and the outlet of the extraction pipe is connected with the primary gas-water separator in the extraction unit.
10. The in-situ thermal desorption system for remediating organically-polluted soil as claimed in claim 9, wherein the heating pipe and the waste heat recovery heating pipe are both metal pipes; the extraction pipe is horizontally arranged in parallel and is arranged in parallel with the heating pipe and the waste heat recovery heating pipe, and the extraction pipe is a metal pipe with sieve pores distributed on the pipe wall; temperature thermocouples of the thermocouple temperature measuring sensors are evenly distributed in different areas and depths of the whole soil body to be repaired and cover cold points in the soil body.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114082775A (en) * | 2021-10-25 | 2022-02-25 | 吴东海 | Construction method of reactor in reactor type thermal desorption system |
| CN114226423A (en) * | 2021-11-29 | 2022-03-25 | 辽宁中博生态环境技术有限公司 | Risk control method for volatile organic pollution site |
| CN115055506A (en) * | 2022-05-13 | 2022-09-16 | 北京建工环境工程咨询有限责任公司 | Contaminated soil remediation system |
| CN116586414A (en) * | 2023-04-19 | 2023-08-15 | 江苏维诗环境科技有限公司 | Soil remediation system based on gas thermal desorption coupling bioremediation |
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- 2021-03-09 CN CN202110254891.3A patent/CN112958613A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114082775A (en) * | 2021-10-25 | 2022-02-25 | 吴东海 | Construction method of reactor in reactor type thermal desorption system |
| CN114226423A (en) * | 2021-11-29 | 2022-03-25 | 辽宁中博生态环境技术有限公司 | Risk control method for volatile organic pollution site |
| CN114226423B (en) * | 2021-11-29 | 2023-09-15 | 辽宁中博生态环境技术有限公司 | Risk management and control method for volatile organic pollution sites |
| CN115055506A (en) * | 2022-05-13 | 2022-09-16 | 北京建工环境工程咨询有限责任公司 | Contaminated soil remediation system |
| CN115055506B (en) * | 2022-05-13 | 2024-04-19 | 北京建工环境工程咨询有限责任公司 | Contaminated soil restoration system |
| CN116586414A (en) * | 2023-04-19 | 2023-08-15 | 江苏维诗环境科技有限公司 | Soil remediation system based on gas thermal desorption coupling bioremediation |
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