CN214488280U - In-situ thermal desorption device for repairing organic contaminated soil - Google Patents
In-situ thermal desorption device for repairing organic contaminated soil Download PDFInfo
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Abstract
The utility model discloses an in-situ thermal desorption device for repairing organic contaminated soil, which comprises a heating and energy supplying unit, an extracting unit, a waste gas treatment unit, a waste water 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 utility model provides a be used for prosthetic original place thermal desorption device of organic contaminated soil, have that the system constitutes simply, facility equipment is ripe, easy operation, repair effect is good, advantages such as energy efficiency height, can be used to the original place horizontal thermal desorption repairing or the different position pile body formula thermal desorption repairing of original place of organic contaminated soil.
Description
Technical Field
The utility model relates to a be applicable to the prosthetic original place thermal desorption processing system of organic contaminated soil among the contaminated soil restoration technical field, specifically, relate to a horizontal thermal desorption processing apparatus of normal position or original place ectopic pile formula thermal desorption processing apparatus for organic contaminated soil is prosthetic.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can be used to handle the normal position horizontal type or the heterotopic pile style of soil original place thermal desorption soil restoration processing apparatus that volatility/semi-volatility organic matter or petroleum class pollute soil, solve the current thermal desorption technique to the relatively poor problem of some pollution plots suitability.
In order to achieve the aim, the utility model provides an in-situ thermal desorption device for repairing organic contaminated soil, wherein, the device 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 device 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.
The in-situ thermal desorption device 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 device 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 device 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 device 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 device 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; the periphery and the top of the outer side of the soil body are covered with cement hardened layers.
The in-situ thermal desorption device for repairing the organic contaminated soil is characterized in that the thickness of the cement hardened layer is greater than or equal to 100 mm.
The in-situ thermal desorption device for repairing the organic contaminated soil is characterized in that in the soil body unit to be repaired, 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 device for repairing 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 utility model provides a be used for prosthetic original place thermal desorption device of organic contaminated soil has following advantage:
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 the in-situ horizontal soil body unit form of the in-situ thermal desorption device for restoring organically-polluted soil of the present invention.
Fig. 2 is the structural schematic diagram of the heterotopic pile type soil body unit form of the in-situ thermal desorption device for restoring organically-polluted soil of the utility model.
Fig. 3 is the utility model discloses a connection schematic diagram is arranged to heating pipe, waste heat recovery heating pipe, extraction pipe that is used for prosthetic original place thermal desorption device of organic contaminated soil.
Fig. 4 is the utility model discloses a regional pipeline arrangement cross-sectional view of the restoration soil body that is used for the prosthetic original place thermal desorption device of organic contaminated soil's normal position horizontal soil body unit form.
Fig. 5 is the utility model discloses a regional pipeline arrangement cross-sectional view of the restoration soil body that is used for prosthetic original place thermal desorption device of organic contaminated soil's dystopy heap body formula soil body unit form.
Fig. 6 is the cross-sectional schematic view of the single heat exchange and extraction assembly in the soil body repairing area in the unit form of the in-situ horizontal soil body of the in-situ thermal desorption device for repairing organically-polluted soil of the utility model.
Fig. 7 is the cross-sectional schematic view of the single heat exchange and extraction assembly in the soil body repairing area of the heterotopic pile type soil body unit form of the in-situ thermal desorption device for repairing organically-polluted soil of the utility model.
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 description will further describe embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1 to 7, the in-situ thermal desorption apparatus for repairing organically-polluted soil provided by the present invention 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 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 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 device for remedying 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 device for repairing organic contaminated soil mainly 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 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 device 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 device 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 device for restoring organic contaminated soil, which operates in the starting 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 device 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 indirectly heats the surrounding soil, 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 utility model provides a be used for prosthetic original place thermal desorption device of organic contaminated soil mainly includes heating energy supply unit 1, extracts unit, exhaust-gas treatment unit 11, waste water treatment unit 15, monitor control unit and treats to restore soil body unit 17. 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 utility model provides a be used for prosthetic original place thermal desorption device of organic contaminated soil provides a contaminated soil original place thermal desorption and handles restoration solution, has and to use conventional diesel oil or natural gas as energy source, and the energy is easily obtained and the availability factor is high, and system equipment constitutes simple reliable, and thermal desorption temperature is high, and thermal desorption duration is long, and repair effect is good, outstanding characteristics such as site conditions strong adaptability.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (10)
1. An in-situ thermal desorption device for repairing organic contaminated soil is characterized by comprising 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.
2. The in-situ thermal desorption device 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 gas exhaust funnel.
3. The in-situ thermal desorption device 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.
4. The in-situ thermal desorption device for remediating organically-polluted soil as claimed in claim 3, 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 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.
5. The in-situ thermal desorption device 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.
6. The in-situ thermal desorption device for remediating the 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 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.
7. The in-situ thermal desorption device for remediating the organically-polluted soil as claimed in claim 6, 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; the periphery and the top of the outer side of the soil body are covered with cement hardened layers.
8. The in-situ thermal desorption device for remediating organically-polluted soil as claimed in claim 7, wherein the thickness of the hardened cement layer is greater than or equal to 100 mm.
9. The in-situ thermal desorption device for remediating organic contaminated soil as claimed in claim 7, 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 device for remediating the 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120497431.9U CN214488280U (en) | 2021-03-09 | 2021-03-09 | In-situ thermal desorption device for repairing organic contaminated soil |
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| CN202120497431.9U CN214488280U (en) | 2021-03-09 | 2021-03-09 | In-situ thermal desorption device for repairing organic contaminated soil |
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