CN111644454A - Contaminated soil thermal desorption remediation system and method - Google Patents
Contaminated soil thermal desorption remediation system and method Download PDFInfo
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- CN111644454A CN111644454A CN202010561306.XA CN202010561306A CN111644454A CN 111644454 A CN111644454 A CN 111644454A CN 202010561306 A CN202010561306 A CN 202010561306A CN 111644454 A CN111644454 A CN 111644454A
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- thermal desorption
- tail gas
- contaminated soil
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- soil
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
- B08B9/0808—Cleaning containers having tubular shape, e.g. casks, barrels, drums by methods involving the use of tools, e.g. by brushes, scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
Abstract
The application discloses pollute soil thermal desorption repair system and method, wherein pollute soil thermal desorption repair system including polluting soil thermal desorption device and tail gas processing system, tail gas processing system connects the tail gas discharge mouth who pollutes soil thermal desorption device, tail gas processing system is including the steam filter, one-level condensing equipment, vacuum generator, second grade condensing equipment, active carbon filter and the gas discharge device who connects gradually. The system and the method can obviously reduce the operation energy consumption and the repair cost of the system, obviously reduce the maintenance frequency of the system, keep the safe and stable continuous operation of the system and improve the thermal desorption effect of the polluted soil.
Description
Technical Field
The application relates to the technical field of soil remediation, in particular to a thermal desorption remediation system and method for contaminated soil.
Background
At present, the heterotopic repaired organic contaminated soil is mostly repaired by a thermal desorption technology, and the thermal desorption repair technology is a process of heating the contaminated soil to a sufficient temperature through direct heating or indirect heating so as to volatilize or separate organic pollutants contained in the contaminated soil.
When carrying out thermal desorption to the contaminated soil that contains oil, current thermal desorption repair system's tail gas processing system structural design is unreasonable, does not generally have material (oil) recovery unit or retrieves the quality of material (oil) relatively poor, causes environmental secondary pollution, and the pollutant is handled incompletely. Disclose an organic contaminated soil multistage thermal desorption repair system as CN 104607455A, including first order thermal desorption device, second grade thermal desorption device, tail gas processing apparatus, second combustion chamber and falling formula conveyer belt constitution. The tail gas treatment device consists of a cyclone dust collector, a spray cooling tower, a dehumidifier, a tail gas activated carbon adsorber and a vacuum pump.
Secondly, the polluting organisms often stick to the walls of the thermal desorption device due to the physicochemical reactions, the thicker the insulating layer, the lower the heat transfer efficiency. For example, CN 105750319 a discloses a thermal desorption device for soil pollution, which comprises a support and a horizontal heating cylinder arranged on the support. The left end upper side of cartridge heater is equipped with feedstock channel, and the right-hand member downside of cartridge heater is equipped with discharge channel, and the outside of cartridge heater is equipped with solar energy collection pipe, and one side of support is equipped with the solar energy reflector panel. Be equipped with the main shaft in the heating cylinder, the surface of main shaft is equipped with the spiral area, is equipped with the motor that the drive main shaft turned to on the support, and the left end upper side of heating cylinder is equipped with the intake pipe, and the right-hand member upside of heating cylinder is equipped with the blast pipe, is equipped with the exhaust fan on the blast pipe. When the polluted organic matters are stuck on the pipe wall of the thermal desorption device, the operation can only be stopped, the kiln is cooled, and the interior of the kiln is manually cleaned.
The existing thermal desorption repair system has the problems of high operation energy consumption, high treatment cost, high maintenance frequency, poor system safety and the like. These problems have greatly limited the application of this technology.
Disclosure of Invention
Therefore, it is necessary to provide a thermal desorption remediation system and method for contaminated soil, aiming at the technical problem that the structural design of the existing tail gas treatment system is unreasonable.
The technical scheme provided by the invention is as follows: the utility model provides a pollute soil thermal desorption repair system, is including polluting soil thermal desorption device and tail gas processing system, tail gas processing system connects the tail gas discharge port who pollutes soil thermal desorption device, tail gas processing system is including the steam filter, one-level condensing equipment, vacuum generator, second grade condensing equipment, active carbon filter and the gas discharge device who connects gradually.
In the technical scheme, the steam filter can remove dust in the tail gas from the tail gas, and the separation efficiency is more than 99.6%; meanwhile, in order to avoid condensation in the steam filter, the temperature of the steam filter is consistent with that of the thermal desorption working area. The first-stage condensing device is provided with a recovery tank, and substances with higher boiling points in the tail gas are condensed into liquid (such as water, oil products and the like) in sequence due to different condensing points after the first-stage condensation. The vacuum generator provides a vacuum environment for the thermal desorption working area, the polluted soil is heated under negative pressure, the boiling point of the pollutants is reduced, and the efficient thermal desorption effect can be achieved only by relatively low heating temperature. The second-stage condensing device is provided with a volatile organic compound storage tank, and after passing through the first-stage condensing device, the volatile organic compounds with low boiling points in the tail gas are condensed into liquid under the condensation effect of the second-stage condensing device and then enter the storage tank. The activated carbon filter can thoroughly adsorb some residual oxysulfide, nitric oxide and the like in the tail gas, so that the tail gas can reach the emission standard.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Optionally, the contaminated soil thermal desorption remediation system comprises a feeding device, wherein the feeding device is connected with a feeding port of the contaminated soil thermal desorption device.
Optionally, the feeding device is composed of a screw conveyor and a scale. And metering the pretreated polluted soil in the process of conveying the polluted soil to a polluted soil thermal desorption device by a screw conveyor.
Optionally, the contaminated soil thermal desorption remediation system comprises a discharging device, and the discharging device is connected with a discharging port of the contaminated soil thermal desorption device.
Optionally, the contaminated soil thermal desorption device comprises a heat insulation outer cylinder and a heat conduction inner cylinder, a heat exchange area is arranged between the heat insulation outer cylinder and the heat conduction inner cylinder, and a thermal desorption working area is arranged inside the heat conduction inner cylinder; the inner wall of the heat conduction inner barrel is provided with a scraper which is attached to the end portion of the stirring paddle. A rotating shaft is arranged in the heat conduction inner cylinder, and a stirring paddle is arranged on the rotating shaft and used for stirring and conveying the polluted soil in the thermal desorption working area. Due to physical and chemical reactions, the polluted organic matters are often adhered to the pipe wall of the heat-conducting inner cylinder, and when the rotating shaft rotates, the scraper close to or attached to the inner wall of the heat-conducting inner cylinder scrapes the polluted organic matters and the polluted soil adhered to the pipe wall of the heat-conducting inner cylinder, so that the best effect of heat transfer is ensured.
Optionally, the heat exchange area is externally connected with a circulating pump and a hot oil heating device through a pipeline. The heat insulation outer cylinder is made of heat insulation materials, the heat conduction inner cylinder is made of heat conduction materials, heat conduction oil flows in the heat exchange area, and the heat conduction oil circularly flows in the heat exchange area through the circulating pump and the hot oil heating device. The heating mode of the heat conducting oil can adopt gas heating or electric heating.
Optionally, the thermal desorption working area is a vacuum working area during working. The thermal desorption working area is in a vacuum state of about 50mbar during operation, the boiling point of hydrocarbons is reduced under the pressure, the heating temperature of the heat-conducting inner cylinder can be reduced by 100-120 ℃, and meanwhile, the combustion and explosion of the hydrocarbons are inhibited by the low-pressure environment, so that the safety and stability of the operation of the device are ensured.
Optionally, the heat insulation outer cylinder and the heat conduction inner cylinder are of a horizontal structure, the rotating shaft is horizontally arranged, and an included angle is formed between the stirring paddle and a plane perpendicular to the rotating shaft.
Optionally, a feed inlet, a discharge outlet and a tail gas discharge outlet are respectively arranged above the head part, above the tail part and below the tail part of the heat insulation outer cylinder.
Optionally, adjacent stirring blades are arranged in a staggered manner and located on two sides of the plane.
The invention also provides a method for carrying out thermal desorption remediation on the contaminated soil by using the thermal desorption remediation system for the contaminated soil, which comprises the following steps:
1) conveying the pretreated polluted soil to a feeding device, and conveying the polluted soil to a thermal desorption device of the polluted soil for thermal desorption by a screw conveyor of the feeding device;
2) and discharging the soil subjected to thermal desorption through a discharging device, and performing related substance recovery and adsorption on tail gas subjected to thermal desorption through a tail gas treatment system to discharge after reaching the standard.
Optionally, during thermal desorption in step 1), the thermal desorption working area is in a vacuum state of 45-55mbar, the temperature is 200-380 ℃, and the retention time of the contaminated soil in the thermal desorption working area is 10-25 min.
Optionally, the step 2) of performing relevant substance recovery and adsorption on the tail gas through the tail gas treatment system specifically includes:
(1) removing dust in the tail gas after heat desorption by using a steam filter;
(2) the primary condensing device is provided with a recovery tank, and water and oil products with higher boiling points in the tail gas are condensed into liquid for recovery after primary condensation;
(3) the secondary condensing device is provided with a volatile organic compound storage tank, and after passing through the primary condensing device, the volatile organic compounds with low boiling points in the tail gas are condensed into liquid under the condensing action of the secondary condensing device for recycling;
(4) the active carbon filter absorbs the residual oxysulfide and nitric oxide in the tail gas, so that the tail gas can reach the emission standard.
The invention has the following beneficial effects:
(1) the thermal desorption remediation system for the polluted soil is provided with the steam filter, so that 99.6% of dust in the tail gas can be efficiently blocked, and the solid content in the subsequent condensate is less than 0.02%. The primary condensing device is arranged to effectively recover water and oil products with higher boiling points, and the secondary condensing device is arranged to effectively recover volatile organic compounds with low boiling points.
(2) The thermal desorption device for the polluted soil adopts a fixed cylindrical structure, is provided with a rotating shaft and a stirring paddle, and is provided with a scraping blade. When the rotating shaft rotates, the scraping blade can thoroughly scrape the inner surface of the heat-conducting inner cylinder, and the best effect of heat transfer can be ensured. Meanwhile, manual cleaning of the heat-conducting inner cylinder is avoided, and basically no maintenance requirement exists in a thermal desorption working area.
(3) The thermal desorption device for the polluted soil adopts the high-efficiency heat transfer of the circulating heat transfer oil to effectively transfer heat energy to the heat transfer inner cylinder and the rotating shaft, so that the utilization rate of the energy consumption of the system is maintained at about 80 percent, and the treatment cost can be greatly reduced.
(4) The thermal desorption device for the polluted soil is in a vacuum state when working, and works in a vacuum state of 45-55mbar, under the pressure condition, the boiling point of the pollutant hydrocarbon is reduced, the heating temperature of the heat conduction inner cylinder can be reduced by about 100-120 ℃, and meanwhile, the low-pressure environment also ensures that the device has no risk of fire and explosion.
Drawings
FIG. 1 is a block diagram of a thermal desorption remediation system for contaminated soil according to the present invention;
FIG. 2 is a schematic structural view of a thermal desorption apparatus for contaminated soil according to the present invention;
fig. 3 is a side view of the contaminated soil thermal desorption apparatus of the present invention.
Wherein, 1, an insulating outer cylinder; 2. a heat-conducting inner cylinder; 3. a heat exchange zone; 4. a thermal desorption working area; 5. a rotating shaft; 6. a stirring paddle; 7. scraping; 8. a feed inlet; 9. a discharge port; 10. and a tail gas outlet.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For a better description and illustration of embodiments of the application, reference may be made to one or more of the drawings, but additional details or examples used in describing the drawings should not be construed as limiting the scope of any of the inventive concepts of the present application, the presently described embodiments, or the preferred versions.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in fig. 1, the contaminated soil thermal desorption remediation system comprises a feeding device, a contaminated soil thermal desorption device, a discharging device and a tail gas treatment system which are connected in sequence.
Wherein, the feeding device is composed of a screw conveyer and a weighing scale. Feeding the pretreated polluted soil into a screw conveyor, conveying the polluted soil to a thermal desorption device of the polluted soil by the screw conveyor, and metering by a metering scale in the process.
As shown in fig. 2 to 3, the contaminated soil thermal desorption device is cylindrical as a whole, and includes a heat insulation outer cylinder 1 and a heat conduction inner cylinder 2, which are arranged coaxially and in a horizontal structure. A feed inlet 8 communicated with the heat-conducting inner cylinder 2 is arranged above the head part of the heat-insulating outer cylinder 1 and is used for being connected with a feeding device. A discharge port 9 communicated with the heat-conducting inner cylinder 2 is arranged below the tail part of the heat-insulating outer cylinder 1 and is used for connecting a discharge device. And a tail gas outlet 10 communicated with the heat-conducting inner cylinder 2 is arranged above the tail part of the heat-insulating outer cylinder 1 and is used for connecting a tail gas treatment system.
The heat insulation outer barrel 1 is made of heat insulation materials, the heat conduction inner barrel 2 is made of heat conduction materials, a heat exchange area 3 is arranged between the heat insulation outer barrel 1 and the heat conduction inner barrel 2, heat conduction oil flows in the heat exchange area 3 in a circulating mode, and the heat conduction oil flows in the heat exchange area 3 in a circulating mode through a circulating pump and a hot oil heating device. The heat exchange area 3 is externally connected with a circulating pump and a hot oil heating device through pipelines. The hot oil heating device can be a heat conduction oil furnace, and the heating mode of the heat conduction oil can be gas heating or power heating. The high-efficiency heat transfer of the circulating heat conduction oil is adopted, the heat energy is effectively transferred to the heat conduction inner cylinder 2 and the rotating shaft 5, the utilization rate of the energy consumption of the system is maintained at about 80%, and the treatment cost can be greatly reduced.
The inside of the heat conduction inner cylinder 2 is a thermal desorption working area 4, and a rotating shaft 5 is arranged in the heat conduction inner cylinder 2 and is controlled to rotate by a motor. A plurality of groups of stirring paddles 6 are arranged on the rotating shaft 5, the end parts of the stirring paddles 6 are provided with scrapers 7 attached to the inner wall of the heat conduction inner cylinder 2, and a group of stirring paddles 6 are provided with four scrapers 7 which are axisymmetric. When the rotating shaft 5 rotates, the contaminated soil in the thermal desorption working area 4 is stirred and conveyed, and the scraper 7 scrapes the contaminated organic matters and the contaminated soil adhered to the pipe wall of the heat conduction inner cylinder 2, so that the best heat transfer effect is ensured.
In one embodiment, the stirring paddles 6 and the plane perpendicular to the rotating shaft 5 form an included angle, the included angle is generally 10-20 degrees, and the adjacent stirring paddles 6 are arranged in a staggered manner, namely distributed on two sides of the perpendicular plane, so that the stirring effect is increased, and the scraping efficiency is improved.
The thermal desorption working area 4 is a vacuum working area during working. The thermal desorption working area 4 is in a vacuum state of about 50mbar when in operation, the boiling point of the hydrocarbons is reduced under the pressure, the heating temperature of the heat conduction inner cylinder 2 can be reduced by 100-120 ℃, and meanwhile, the combustion and explosion of the hydrocarbons are inhibited by the low-pressure environment, so that the safety and stability of the operation of the device are ensured.
The discharging device comprises a discharging pit, a cooling device and a screw conveyer. And the soil subjected to thermal desorption enters a discharge pit, enters a screw conveyor through the discharge pit, and is cooled by a cooling device to discharge clean solids.
As shown in fig. 1, the tail gas treatment system includes a steam filter, a primary condensing device, a vacuum generator, a secondary condensing device, an activated carbon filter and a gas discharging device, which are connected in sequence.
The steam filter can remove dust in the tail gas from the tail gas, and the separation efficiency is more than 99.6%; meanwhile, in order to avoid condensation in the steam filter, the temperature of the steam filter is kept consistent with that of the thermal desorption working area 4.
The first-stage condensing device is provided with a recovery tank 1 and a recovery tank 2, and substances with higher boiling points in the tail gas are condensed into liquid (such as water, oil products and the like) in sequence due to different condensing points after first-stage condensation so as to be recovered.
The vacuum generator provides a vacuum environment for the thermal desorption working area 4, the polluted soil is heated under negative pressure, the boiling point of the pollutants is reduced, and the high-efficiency thermal desorption effect can be achieved only by relatively low heating temperature.
The second grade condensing equipment is equipped with volatile organic compounds storage tank 1, behind the first grade condensing equipment, the low boiling volatile organic compounds in the tail gas condenses into liquid and gets into storage tank 1 under second grade condensing equipment's condensation.
The active carbon filter can thoroughly adsorb some residual oxysulfide, nitric oxide and the like in the tail gas, so that the tail gas reaches the standard and is discharged by a gas discharge device.
The contaminated soil thermal desorption remediation system is also provided with a monitoring system which consists of a central control cabinet, a PLC, an instrument and accessory equipment, and monitoring probes are respectively arranged in the feeding device, the contaminated soil thermal desorption device, the discharging device and the tail gas treatment system, so that the pressure, the temperature and the flow of the operation of the relevant parts of the system can be monitored, and the automatic and accurate control of the thermal desorption system is realized.
The method for carrying out thermal desorption remediation on the contaminated soil by utilizing the thermal desorption remediation system for the contaminated soil comprises the following steps:
1) conveying the pretreated polluted soil to a feeding device, and conveying the polluted soil to a thermal desorption device of the polluted soil for thermal desorption by a screw conveyor of the feeding device;
2) and discharging the soil subjected to thermal desorption through a discharging device, and performing related substance recovery and adsorption on tail gas subjected to thermal desorption through a tail gas treatment system to discharge after reaching the standard.
Wherein, during thermal desorption in the step 1), the thermal desorption working area 4 is in a vacuum state of 45-55mbar, the temperature is 200-380 ℃, and the retention time of the polluted soil in the thermal desorption working area 4 is 10-25 min.
The step 2) of recovering and adsorbing related substances of the tail gas through the tail gas treatment system specifically comprises the following steps: (1) removing dust in the tail gas after heat desorption by using a steam filter; (2) the primary condensing device is provided with a recovery tank 1 and a recovery tank 2, and water and oil products with higher boiling points in the tail gas are condensed into liquid for recovery after primary condensation; (3) the secondary condensing device is provided with a volatile organic compound storage tank 1, and after passing through the primary condensing device, the volatile organic compounds with low boiling points in the tail gas are condensed into liquid under the condensing action of the secondary condensing device for recycling; (4) the active carbon filter absorbs the residual oxysulfide and nitric oxide in the tail gas, so that the tail gas can reach the emission standard.
By adopting the contaminated soil thermal desorption repair system and the contaminated soil thermal desorption repair method, the system operation energy consumption and repair cost can be obviously reduced, the system maintenance frequency can be obviously reduced, the safe and stable continuous operation of the system can be kept, and the contaminated soil thermal desorption effect is improved. The method is suitable for any substance with the boiling point lower than 450 ℃ under normal pressure, such as TPHs (total petroleum hydrocarbon), PAHs (polycyclic aromatic hydrocarbons), PCBs (polychlorinated biphenyl), volatile and semi-volatile organic compounds and volatile heavy metal mercury.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a pollute soil thermal desorption repair system, is including polluting soil thermal desorption device and tail gas processing system, tail gas processing system connects the tail gas discharge port who pollutes soil thermal desorption device, a serial communication port, tail gas processing system is including the steam filter, one-level condensing equipment, vacuum generator, second grade condensing equipment, active carbon filter and the gas discharge device who connects gradually.
2. The contaminated soil thermal desorption remediation system of claim 1, comprising a feeding device connected to the feed inlet of the contaminated soil thermal desorption device.
3. The contaminated soil thermal desorption remediation system of claim 2 wherein said feed means comprises a screw conveyor and a scale.
4. The contaminated soil thermal desorption remediation system of claim 1, comprising an outfeed device connected to the outfeed of the contaminated soil thermal desorption device.
5. The contaminated soil thermal desorption remediation system of claim 1, wherein the contaminated soil thermal desorption device comprises a heat-insulation outer cylinder and a heat-conduction inner cylinder, a heat exchange area is arranged between the heat-insulation outer cylinder and the heat-conduction inner cylinder, and a thermal desorption working area is arranged inside the heat-conduction inner cylinder; the inner wall of the heat conduction inner barrel is provided with a scraper which is attached to the end portion of the stirring paddle.
6. The contaminated soil thermal desorption remediation system of claim 5 wherein the heat exchange zone is externally connected by a circulation pump and a hot oil heating device via piping.
7. The contaminated soil thermal desorption remediation system of claim 5, wherein the thermal desorption operating zone is a vacuum operating zone during operation.
8. A method for carrying out thermal desorption remediation on contaminated soil by using the thermal desorption remediation system for contaminated soil as claimed in any one of claims 1 to 7, the method comprising the following steps:
1) conveying the pretreated polluted soil to a feeding device, and conveying the polluted soil to a thermal desorption device of the polluted soil for thermal desorption by a screw conveyor of the feeding device;
2) and discharging the soil subjected to thermal desorption through a discharging device, and performing related substance recovery and adsorption on tail gas subjected to thermal desorption through a tail gas treatment system to discharge after reaching the standard.
9. The method according to claim 8, wherein during the thermal desorption in the step 1), the thermal desorption working area is in a vacuum state of 45-55mbar, the temperature is 200-380 ℃, and the retention time of the contaminated soil in the thermal desorption working area is 10-25 min.
10. The method according to claim 8, wherein the step 2) of performing relevant substance recovery and adsorption on the tail gas through a tail gas treatment system specifically comprises:
(1) removing dust in the tail gas after heat desorption by using a steam filter;
(2) the primary condensing device is provided with a recovery tank, and water and oil products with higher boiling points in the tail gas are condensed into liquid for recovery after primary condensation;
(3) the secondary condensing device is provided with a volatile organic compound storage tank, and after passing through the primary condensing device, the volatile organic compounds with low boiling points in the tail gas are condensed into liquid under the condensing action of the secondary condensing device for recycling;
(4) the active carbon filter absorbs the residual oxysulfide and nitric oxide in the tail gas, so that the tail gas can reach the emission standard.
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| CN202010561306.XA CN111644454A (en) | 2020-06-18 | 2020-06-18 | Contaminated soil thermal desorption remediation system and method |
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| CN202010561306.XA CN111644454A (en) | 2020-06-18 | 2020-06-18 | Contaminated soil thermal desorption remediation system and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658021A (en) * | 2020-12-08 | 2021-04-16 | 南京工业大学 | Medium internal circulation enhanced thermal desorption soil remediation reactor and method thereof |
| CN113477692A (en) * | 2021-07-07 | 2021-10-08 | 东南大学 | Organic matter contaminated soil grading thermal desorption and organic matter recycle system |
| CN114515524A (en) * | 2021-12-27 | 2022-05-20 | 重庆中天海智生态环境科技有限公司 | Soil remediation thermal desorption equipment and process thereof |
| CN114700361A (en) * | 2022-05-10 | 2022-07-05 | 安徽省通源环境节能股份有限公司 | Three-dimensional layered continuous superheated steam thermal desorption device for waste heat recycling |
| CN114871263A (en) * | 2022-04-29 | 2022-08-09 | 北京建工环境工程咨询有限责任公司 | Contaminated soil remediation device and soil remediation method |
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2020
- 2020-06-18 CN CN202010561306.XA patent/CN111644454A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658021A (en) * | 2020-12-08 | 2021-04-16 | 南京工业大学 | Medium internal circulation enhanced thermal desorption soil remediation reactor and method thereof |
| US11724292B2 (en) | 2020-12-08 | 2023-08-15 | Nanjing Tech University | Medium internal circulation enhanced thermal desorption soil remediation reactor and method thereof |
| CN113477692A (en) * | 2021-07-07 | 2021-10-08 | 东南大学 | Organic matter contaminated soil grading thermal desorption and organic matter recycle system |
| CN114515524A (en) * | 2021-12-27 | 2022-05-20 | 重庆中天海智生态环境科技有限公司 | Soil remediation thermal desorption equipment and process thereof |
| CN114871263A (en) * | 2022-04-29 | 2022-08-09 | 北京建工环境工程咨询有限责任公司 | Contaminated soil remediation device and soil remediation method |
| CN114700361A (en) * | 2022-05-10 | 2022-07-05 | 安徽省通源环境节能股份有限公司 | Three-dimensional layered continuous superheated steam thermal desorption device for waste heat recycling |
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