CN114082773A - Heap construction thermal desorption system and method for organic pollution - Google Patents
Heap construction thermal desorption system and method for organic pollution Download PDFInfo
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- CN114082773A CN114082773A CN202111148662.XA CN202111148662A CN114082773A CN 114082773 A CN114082773 A CN 114082773A CN 202111148662 A CN202111148662 A CN 202111148662A CN 114082773 A CN114082773 A CN 114082773A
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- 238000003795 desorption Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010276 construction Methods 0.000 title description 9
- 239000002689 soil Substances 0.000 claims abstract description 76
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 238000000605 extraction Methods 0.000 claims abstract description 31
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 54
- 238000000926 separation method Methods 0.000 claims description 48
- 238000001816 cooling Methods 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 claims description 17
- 239000002957 persistent organic pollutant Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000446 fuel Substances 0.000 claims description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 239000011381 foam concrete Substances 0.000 claims description 6
- 239000003345 natural gas Substances 0.000 claims description 5
- 239000002826 coolant Substances 0.000 claims description 4
- 239000003949 liquefied natural gas Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 3
- 239000000356 contaminant Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000005067 remediation Methods 0.000 description 4
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- MEMIXVDDQYBFTP-UHFFFAOYSA-N ClC1=CC=CC=C1.ClC1=CC=C(Cl)C=C1.ClC1=CC=CC(Cl)=C1.ClC1=CC=CC=C1Cl Chemical compound ClC1=CC=CC=C1.ClC1=CC=C(Cl)C=C1.ClC1=CC=CC(Cl)=C1.ClC1=CC=CC=C1Cl MEMIXVDDQYBFTP-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011066 ex-situ storage Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- ZPQOPVIELGIULI-UHFFFAOYSA-N 1,3-dichlorobenzene Chemical compound ClC1=CC=CC(Cl)=C1 ZPQOPVIELGIULI-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- 241000722923 Tulipa Species 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a pile-building thermal desorption system for organic pollution, which comprises a heat-insulating isolation layer for wrapping a polluted soil pile body, a heating pipeline for burying and uniformly heating the polluted soil pile body, and an extraction pipeline for sucking organic steam in the polluted soil pile body. Also relates to a heap thermal desorption method for organic pollution related to the method. The invention has the advantages that a novel low-pollution treatment method is provided on the premise of ensuring the treatment effect of the organic polluted soil, and the treatment benefit is improved.
Description
Technical Field
The invention belongs to the field of organic contaminated soil remediation, and particularly relates to a heap construction thermal desorption technology.
Background
In recent years, thermal desorption technology of contaminated soil is applied in large scale in organic contaminated soil remediation, and most of the thermal desorption technology is in situ thermal desorption, which easily affects local environment and has low efficiency. Although the effect of the heterotopic thermal desorption in the prior art is better, the construction and operation costs are very high, and the operation is extremely complex.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and solve the problem of high cost of ex-situ thermal desorption remediation of polluted soil.
In order to achieve the aim, the invention provides a heap construction thermal desorption system for organic pollution, which comprises a heat insulation isolation layer for wrapping a polluted soil heap body, a heating pipeline for burying and uniformly heating the polluted soil heap body, and an extraction pipeline for pumping organic steam in the polluted soil heap body; the extraction pipeline and the heating pipeline are arranged at intervals; the inlet end of the heating pipeline is communicated with a fuel outlet, a burner used for burning fuel in the heating pipeline is arranged at the inlet end of the heating pipeline, the outlet end of the heating pipeline is communicated with a cooling inlet of a first heat exchanger, a cooling outlet of the first heat exchanger is communicated to an inlet of a first gas-liquid separation tank, and a gas outlet of the first gas-liquid separation tank is connected to a first fan which discharges outwards; an extraction outlet of the extraction pipeline is communicated to a cooling inlet of the first-stage heat exchanger, a cooling outlet of the first-stage heat exchanger is communicated to an inlet of the first-stage gas-liquid separation tank, a gas outlet of the first-stage gas-liquid separation tank is connected with a cooling inlet of the second-stage heat exchanger, a cooling outlet of the second-stage heat exchanger is communicated to an inlet of the second-stage gas-liquid separation tank, and a gas outlet of the second-stage gas-liquid separation tank is communicated to an inlet end of the heating pipeline through a second fan.
Preferably, a temperature and pressure monitoring well for detecting the polluted soil pile body is further arranged.
Preferably, on average, every 350m3And (5) setting a temperature and pressure monitoring well for the polluted soil.
Preferably, the air outlet of the first fan is communicated with a high chimney, and an activated carbon adsorption device is arranged between the first fan and the high chimney.
Preferably, the water outlets of the first gas-liquid separation tank, the first-stage gas-liquid separation tank and the second-stage gas-liquid separation tank are communicated to a water treatment facility.
Preferably, a third fan for pushing pipeline media to be output is further arranged between the outlet end of the heating pipeline and the cooling inlet of the first heat exchanger.
Preferably, the circulating coolant of the first heat exchanger, the primary heat exchanger and the secondary heat exchanger is conveyed by a cooling tower.
Preferably, the heat-insulating isolation layer is foam concrete with the thickness of 3-8 cm.
The reactor-building thermal desorption method for organic pollution is also provided, and the reactor-building thermal desorption system comprises the following steps:
the first step is as follows: stacking organic contaminated soil and building the heat insulation isolation layer outside, laying the heating pipeline and the extraction pipeline in the stacking process, and building a temperature and pressure monitoring well at the top of the contaminated soil pile body;
the second step is that: delivering the liquefied natural gas to the combustor to ignite and combust to form high-temperature fluid, enabling the high-temperature fluid to flow through the heating pipeline embedded in the soil heap to heat the soil heap, and volatilizing organic pollutants from soil after reaching a certain temperature;
the third step: the extraction pipeline pumps high-temperature steam which is volatilized from soil and contains organic pollutants out to the heat exchanger, the high-temperature steam is cooled and then is separated in the gas-liquid separation tank, and liquid which is difficult to burn is separated out; after two times of continuous cooling and gas-liquid separation, the liquid which is difficult to burn enters the water treatment facility for treatment, and the separated gas contains a large amount of organic components, is extracted by a second fan, is recycled to the combustor to be mixed with natural gas and then is burned.
Preferably, the humidity of the polluted soil pile is adjusted to be not more than 30%, the particle size is reduced to be less than 20-30mm through screening, the heating time is 30-90 days, and the temperature is maintained to be 50-350 ℃; the boiling point of the organically contaminated contaminants to be treated is below 450 ℃.
Preferably, the size of the polluted soil pile is 10-20m in width, 15-100m in length and 2-5m in height.
Compared with the traditional ectopic thermal desorption measures, the scheme has the following advantages:
1. traditional heating equipment is not required to be built, isolation and direct pipeline heat transfer are carried out on the basis of the soil heap, construction cost is saved, and implementation is convenient;
2. the extracted organic pollutants are recycled, and are used for combustion heating after extraction and separation to heat the stack body, so that the pollutants are recycled and further removed in the process, the amount of the organic pollutants to be finally treated is reduced, the using amount of the activated carbon is saved, and the cost is saved from multiple angles;
3. the flow velocity of high-temperature fluid in the pipeline can be adjusted, so that the temperature rise range is wide, and various organic pollutants can be treated;
4. the secondary treatment of the organic pollutants can realize the high-efficiency treatment of the organic matters, and has high removal rate and less secondary pollution.
5. The multiple components are highly modularized, and the modularized installation and disassembly of the thermal desorption process can be realized.
The invention has the advantages that a novel low-pollution treatment method is provided on the premise of ensuring the treatment effect of the organic polluted soil, and the treatment benefit is improved.
Drawings
FIG. 1 is a schematic diagram of a heap-built thermal desorption system framework according to the present invention;
wherein:
1-contaminated soil pile 2-heating pipeline 21-burner
3-extraction pipeline 4-fuel outlet 5-first heat exchanger
51-primary heat exchanger 52-secondary heat exchanger 53-cooling tower
6-first gas-liquid separation tank 61-first stage gas-liquid separation tank 62-second stage gas-liquid separation tank
63-Water treatment facility 7-first blower 71-third blower
8-second fan 9-high chimney 91-active carbon adsorption device
Detailed Description
The invention is further described below with reference to the following figures and specific examples.
A heap thermal desorption system for organic pollution shown in fig. 1 comprises a thermal insulation isolation layer (not shown in the figure, but the structure can be understood by those skilled in the art) for wrapping a polluted soil heap 1, a heating pipeline 2 for burying and uniformly heating the polluted soil heap 1, and an extraction pipeline 3 for sucking organic steam in the polluted soil heap 1; the extraction pipeline 3 and the heating pipeline 2 are arranged at intervals; the inlet end of the heating pipeline 2 is communicated with a fuel outlet 4, the inlet end of the heating pipeline 2 is provided with a burner 21 for burning fuel in the heating pipeline, the outlet end of the heating pipeline 2 is communicated with a cooling inlet of a first heat exchanger 5, a cooling outlet of the first heat exchanger 5 is communicated to the inlet of a first gas-liquid separation tank 6, and the air outlet of the first gas-liquid separation tank 6 is connected to a first fan 7 which discharges outwards; an extraction outlet of the extraction pipeline 3 is communicated with a cooling inlet of the primary heat exchanger 51, a cooling outlet of the primary heat exchanger 51 is communicated with an inlet of the primary gas-liquid separation tank 61, a gas outlet of the primary gas-liquid separation tank 61 is connected with a cooling inlet of the secondary heat exchanger 52, a cooling outlet of the secondary heat exchanger 52 is communicated with an inlet of the secondary gas-liquid separation tank 62, and a gas outlet of the secondary gas-liquid separation tank 62 is communicated with an inlet end of the heating pipeline 2 through the second fan 8. The top of the polluted soil pile body 1 is provided with a temperature and pressure monitoring well, so that the temperature and pressure monitoring well can be used for monitoring the temperature and the pressure on average every 350m3And respectively monitoring the temperature and the pressure in the polluted soil.
The air outlet of the first fan 7 is communicated with the high chimney 9, and an activated carbon adsorption device 91 is arranged between the first fan 7 and the high chimney 9.
The water outlets of the first gas-liquid separation tank 6, the first-stage gas-liquid separation tank 61 and the second-stage gas-liquid separation tank 62 are communicated to a water treatment facility 63.
And a third fan 71 used for pushing pipeline media to output is arranged between the outlet end of the heating pipeline 2 and the cooling inlet of the first heat exchanger 5.
The circulating coolant of the first heat exchanger 5, the primary heat exchanger 51 and the secondary heat exchanger 52 is delivered by a cooling tower 53.
The heat insulation isolation layer is made of foam concrete with the thickness of 3-8 cm.
When the pile-building thermal desorption system is adopted, the pile-building thermal desorption method for organic pollution, which is utilized, comprises the following steps:
the first step is as follows: stacking organic polluted soil and building the heat-insulating isolation layer outside, laying the heating pipeline 2 and the extraction pipeline 3 in the stacking process, and building a temperature and pressure monitoring well at the top of the polluted soil pile body 1;
the second step is that: delivering the liquefied natural gas to the combustor 21, igniting and combusting to form high-temperature fluid, enabling the high-temperature fluid to flow through the heating pipeline 2 embedded in the soil heap to heat the soil heap, and volatilizing organic pollutants from the soil after the temperature reaches a certain value;
the third step: the extraction pipeline 3 pumps high-temperature steam which is volatilized from soil and contains organic pollutants out to a heat exchanger, the high-temperature steam is cooled and then is separated in a gas-liquid separation tank, and liquid which is difficult to burn is separated out; after two times of continuous cooling and gas-liquid separation, the liquid which is difficult to burn enters the water treatment facility 63 for treatment, and the separated gas containing a large amount of organic components is extracted by the second fan 8 and recycled to the combustor to be mixed with natural gas and then burned.
The scale of the polluted soil pile 1 is 10-20m wide, 15-100m long and 2-5m high. The humidity of the polluted soil pile 1 is adjusted to be not more than 30%, the particle size is reduced to be less than 20-30mm through screening, the heating time is 30-90 days, and the temperature is maintained to be 50-350 ℃; the boiling point of the organically contaminated contaminants to be treated is below 450 ℃.
Specific implementation examples:
the volatile and semi-volatile polluted soil is repaired in a certain plot of Tulipa Gaultflora in Shanghai by adopting an organic pollution heap thermal desorption process.
The soil is high-concentration organic polluted soil, and the specific pollutants are chlorobenzene, 1, 4-dichlorobenzene, 1, 3-dichlorobenzene and 1, 2-dichlorobenzene. The total amount of the soil is about 3500m3And all the reactors are subjected to ex-situ reactor thermal desorption treatment.
1. Analysis of each index of polluted original soil
TABLE 1 parameters of contaminated soil (mg/kg)
| | Chlorobenzene | 1, 4- |
1, 3- |
1, 2-dichlorobenzene | |
| Original concentration | 10 | 25 | 26 | 32 |
2. Polluted soil treatment process and condition
This organic contaminated soil's integral structure who builds heap thermal desorption and handle includes:
the device comprises a polluted soil pile body 1 and a heat insulation isolation layer outside the polluted soil pile body, wherein a fuel combustion inlet and a fuel combustion tail gas outlet (namely an inlet and an outlet of a heating pipeline 2) are respectively arranged at two sides of the pile body;
a heating system comprising a fuel storage tank (i.e. a source of fuel outlets 4), a burner 21, a heating conduit 2;
the extraction circulation system comprises a horizontal extraction well, a vertical extraction well (namely an extraction pipeline 3), a primary heat exchanger 51, a secondary heat exchanger 52, a primary gas-liquid separation tank 61, a secondary gas-liquid separation tank 62, a second blower 8 in a Roots blower form and an organic polluted gas recycling pipeline;
the waste gas treatment system comprises a first heat exchanger 5, a first fan 7 in the form of a centrifugal fan, a dehumidifying device in the form of a first gas-liquid separation tank 6, an activated carbon adsorption device 91 and a high chimney 9.
The fuel is conveyed to the combustor 21 from the fuel storage tank, the combustor 21 is connected with the front end of the heating pipeline 2, the rear end of the heating pipeline 2 is connected with an inlet of a third fan 71 in a centrifugal fan mode, an outlet of the third fan 71 is connected with an air inlet of a first-stage heat exchanger 51, an air outlet of the first-stage heat exchanger 51 is connected with an inlet of a first gas-liquid separation tank 6, an outlet of the first gas-liquid separation tank 6 is connected with an air inlet of an activated carbon adsorption device 91, and an air outlet of the first gas-liquid separation tank is connected with a high chimney 9 through a first fan 7. High-temperature steam of organic pollutants volatilized is extracted by horizontal and vertical extraction pipes to a header pipe to be converged, the header pipe is connected with an inlet of a first-stage heat exchanger 51, an air outlet of the first-stage heat exchanger 51 is connected with an inlet of a first-stage gas-liquid separation tank 61, an air outlet at the upper end of the first-stage gas-liquid separation tank 61 is connected with a second-stage heat exchanger 52, an air outlet of the second-stage heat exchanger 52 is connected with a second fan 8, and the second fan 8 extracts the heat-exchanged gas to the front end of a heating pipeline 2 to be connected with the heating pipeline 2. And water at the water outlet at the lower end of the dehumidifier and the gas-liquid separation tank is collected and uniformly treated.
During construction, a push paving compaction method is adopted for pile construction, the height of the pile is 2.8m, and the plane size is 20m x 70 m. The heating pipelines 2 are buried while being pushed and paved, the distance between the heating pipelines 2 is 2.6m, the heating pipelines are horizontally paved, the number of the heating pipelines is 62, the heating pipelines are made of stainless steel, and the pipe diameter is 133 mm. And pouring foam concrete around the pile body for sealing, and performing heat preservation and protection, wherein the pouring thickness of the foam concrete is 3-5cm, the top of the pile body is poured with cement with the thickness of 10-15cm, and the pile body plays a role in supporting while preserving heat and protecting. Stack bodyMonitoring wells are arranged on the device, wherein the monitoring wells comprise 11 temperature monitoring wells, and the pipe diameter is 30 mm; 5 pressure monitoring wells with pipe diameter of 60mm, and temperature monitoring wells and pressure monitoring wells distributed uniformly every 350m3One soil is arranged.
An extraction system is arranged at the top of the soil heap and comprises 36 horizontal extraction wells and 36 vertical extraction wells, the number of the vertical extraction wells is 39, the pipe diameter is 60mm, the pipe spacing is 1m, and the main pipe is 150 mm.
The heat exchanger is a frame type plate heat exchanger, the plate sheets are in the form of herringbone corrugated plates, the plate heat exchanger is connected with an external pipeline through flanges, and water of the cooling tower 53 is used as a circulating coolant. The Roots blower is a positive displacement blower, the power is 37kw, and the rotating speed is 1480 rpm. The diameter of the pipe at the mixing point was 300 mm. The water treatment comprises the following steps: oil removal, chemical oxidation, flocculation precipitation, filtration and the like.
The burned exhaust gas is collected by the third fan 71. The power of the centrifugal fan is 37kw, the rotating speed is 2900 rpm, and the air quantity is 6000-3H is used as the reference value. The activated carbon adsorption device 91 is an activated carbon box with 5 lattices, wherein at least one lattice is completely filled. The high chimney 9 has a pipe diameter of 500mm and a height of 15m, and a sampling port is arranged at a position of 2 m.
The heap construction thermal desorption operation of the organic polluted soil adopts the following steps:
the first step is as follows: piling up the polluted soil, insulating and fixing the polluted soil by using foam concrete and cement, and building a temperature and pressure monitoring well at the top;
the second step is that: delivering fuel liquefied natural gas to a combustor 21 for ignition and combustion to form high-temperature fluid, wherein the high-temperature fluid flows through a heating pipeline 2 buried in the soil heap to heat the soil heap, and organic pollutants volatilize from soil after the temperature reaches a certain value;
the third step: the extraction pipeline 3 pumps high-temperature steam containing organic pollutants volatilized from the soil out to the heat exchanger, and the high-temperature steam is cooled and then is separated in the gas-liquid separation tank, so that moisture is separated out. After two times of continuous cooling and gas-liquid separation, the liquid enters a water treatment facility 63 for treatment, and the separated gas is extracted by a Roots blower, conveyed to the combustor 21 by a recycling pipeline, mixed with natural gas and then combusted in the combustor 21;
the fourth step: waste gas generated after the mixed combustion of the organic pollutants and the natural gas is extracted from a fuel combustion tail gas outlet by a third fan 71, passes through a heat exchanger and a dehumidifier in sequence, adsorbs and removes the organic pollutants remained in the tail gas by an activated carbon adsorption device 91, and is discharged in the upper air by a high chimney 9.
The method comprises the steps of firstly adding 1% of calcium oxide into the polluted soil for pretreatment, reducing the water content to about 20%, and screening the particle size to be reduced to below 20-30 mm. Raising the temperature of the soil heap to 180 ℃, continuously heating for 35 days, and finally naturally cooling for 30 days.
After the treatment, the thickness is 500m3The soil is self-checked and accepted as a unit.
3. Application results
Concentration of contamination (mg/kg) and removal rate after treatment
| | Chlorobenzene | 1, 4- |
1, 3- |
1, 2-dichlorobenzene | |
| Original concentration | 10 | 25 | 26 | 32 | |
| Concentration after treatment | 0.0691 | 1.97 | <0.08 | 3.52 | |
| Removal rate | 99％ | 92％ | 99％ | 90％ |
In conclusion, after the pile building thermal desorption is adopted, the removal rate of all organic pollutants in the soil can reach more than 90%, and the effective remediation of the soil is realized. The organic pollutants realize the resource reutilization and are further removed.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is capable of numerous equivalents and substitutions, all of which are within the scope of the invention as defined by the appended claims.
Claims (10)
1. A pile-building thermal desorption system for organic pollution is characterized by comprising a heat-insulation isolation layer for wrapping a polluted soil pile body, a heating pipeline for burying and uniformly heating the polluted soil pile body, and an extraction pipeline for sucking organic steam in the polluted soil pile body; the extraction pipeline and the heating pipeline are arranged at intervals; the inlet end of the heating pipeline is communicated with a fuel outlet, a burner used for burning fuel in the heating pipeline is arranged at the inlet end of the heating pipeline, the outlet end of the heating pipeline is communicated with a cooling inlet of a first heat exchanger, a cooling outlet of the first heat exchanger is communicated to an inlet of a first gas-liquid separation tank, and a gas outlet of the first gas-liquid separation tank is connected to a first fan which discharges outwards; an extraction outlet of the extraction pipeline is communicated to a cooling inlet of the first-stage heat exchanger, a cooling outlet of the first-stage heat exchanger is communicated to an inlet of the first-stage gas-liquid separation tank, a gas outlet of the first-stage gas-liquid separation tank is connected with a cooling inlet of the second-stage heat exchanger, a cooling outlet of the second-stage heat exchanger is communicated to an inlet of the second-stage gas-liquid separation tank, and a gas outlet of the second-stage gas-liquid separation tank is communicated to an inlet end of the heating pipeline through a second fan.
2. The heap thermal desorption system of claim 1 further provided with temperature and pressure monitoring wells for detecting contaminated soil heap bodies; average per 350m3And (5) setting a temperature and pressure monitoring well for the polluted soil.
3. The heap thermal desorption system of claim 1 wherein the gas outlet of the first fan is communicated to a high chimney, and an activated carbon adsorption device is arranged between the first fan and the high chimney.
4. The heap thermal desorption system of claim 1 wherein the water outlets of the first gas-liquid separation tank, the primary gas-liquid separation tank and the secondary gas-liquid separation tank are communicated to a water treatment facility.
5. The heap thermal desorption system of claim 1 wherein a third fan for pushing pipeline medium out is further arranged between the outlet end of the heating pipeline and the cooling inlet of the first heat exchanger.
6. The heap thermal desorption system of claim 1 wherein the circulating coolant of the first heat exchanger, the primary heat exchanger, and the secondary heat exchanger is delivered by a cold water tower.
7. The heap thermal desorption system of claim 1 wherein the thermal insulation isolation layer is foam concrete with a thickness of 3-8 cm.
8. A heap thermal desorption method for organic pollution, which is characterized in that the heap thermal desorption system of any one of claims 1 to 7 is adopted, and the method comprises the following steps:
the first step is as follows: stacking organic contaminated soil and building the heat insulation isolation layer outside, laying the heating pipeline and the extraction pipeline in the stacking process, and building a temperature and pressure monitoring well at the top of the contaminated soil pile body;
the second step is that: delivering the liquefied natural gas to the combustor to ignite and combust to form high-temperature fluid, enabling the high-temperature fluid to flow through the heating pipeline embedded in the soil heap to heat the soil heap, and volatilizing organic pollutants from soil after reaching a certain temperature;
the third step: the extraction pipeline pumps high-temperature steam which is volatilized from soil and contains organic pollutants out to the heat exchanger, the high-temperature steam is cooled and then is separated in the gas-liquid separation tank, and liquid which is difficult to burn is separated out; after two times of continuous cooling and gas-liquid separation, the liquid which is difficult to burn enters the water treatment facility for treatment, and the separated gas contains a large amount of organic components, is extracted by a second fan, is recycled to the combustor to be mixed with natural gas and then is burned.
9. The heap thermal desorption method of claim 8 wherein the humidity of the contaminated soil heap is not more than 30%, the particle size screening is reduced to below 20-30mm, the heating time is 30-90 days, and the temperature is maintained at 50-350 ℃; the boiling point of the organically contaminated contaminants to be treated is below 450 ℃.
10. The heap thermal desorption method according to claim 8, wherein the size of the contaminated soil heap is 10-20m wide, 15-100m long and 2-5m high.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5213445A (en) * | 1991-09-26 | 1993-05-25 | Ikenberry Maynard D | System for heated air extraction of contaminants from soil stack |
| US5836718A (en) * | 1997-01-13 | 1998-11-17 | Price; Philip A. | Method and apparatus for ex situ cleaning of contaminated soil |
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| US20080069640A1 (en) * | 2004-06-11 | 2008-03-20 | Jan Haemers | Method and System for Cleaning a Soil Containing Contaminants |
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