CN110986575A - Thermal desorption energy-saving system and method for repairing polycyclic aromatic hydrocarbon contaminated soil - Google Patents
Thermal desorption energy-saving system and method for repairing polycyclic aromatic hydrocarbon contaminated soil Download PDFInfo
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- CN110986575A CN110986575A CN201910983979.1A CN201910983979A CN110986575A CN 110986575 A CN110986575 A CN 110986575A CN 201910983979 A CN201910983979 A CN 201910983979A CN 110986575 A CN110986575 A CN 110986575A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
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Abstract
The invention discloses a thermal desorption energy-saving system and method for repairing polycyclic aromatic hydrocarbon contaminated soil, which comprises an indirect heating rotary kiln, a smoke dust removal device and a high-temperature oxidation chamber which are sequentially connected, wherein the indirect heating rotary kiln is divided into a first-stage heating kiln and a second-stage heating kiln which are both composed of an inner cylinder and an outer cylinder, an inlet of the inner cylinder of the first-stage heating kiln is connected with a conveying belt for inputting contaminated soil to be treated, an outlet of the inner cylinder of the first-stage heating kiln is communicated with an inlet of the inner cylinder of the second-stage heating kiln, an outlet of the inner cylinder of the second-stage heating kiln is connected with a screw conveyor for outputting clean soil, the inner cylinder of the first-stage heating kiln is further sequentially communicated with the inner cylinder of the second-stage heating kiln, the smoke dust removal device and the high-temperature oxidation chamber through gas. The system indirectly heats the soil with high-temperature flue gas to perform two-stage thermal desorption, has the advantages of energy conservation, low operation cost and the like, and is most suitable for treating polycyclic aromatic hydrocarbon polluted soil.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a thermal desorption energy-saving system and method for remediating polycyclic aromatic hydrocarbon contaminated soil.
Background
With the development of the society of China, the adjustment of the industrial structure and the transformation of the economic development mode, a large number of industrial enterprises stop production, close or migrate to different places, a large number of organic pollution sites are left, and repair is needed urgently. However, these contaminated sites are often used for real estate development and the like. The repair task is heavy and the period is short, so that a quick and efficient repair technology is needed. The thermal desorption technology is taken as an ex-situ remediation technology, has the characteristics of high remediation speed, high efficiency, strong universality and the like, and is widely applied to remediation treatment of organic matter polluted sites.
The thermal desorption technology is a process of heating organic pollutants in soil to a certain temperature through heat exchange under a vacuum condition or when carrier gas is introduced, so that the organic pollutants are volatilized or separated from a polluted medium and enter a gas treatment system to carry out centralized treatment on the pollutants in tail gas, and finally, the soil is thoroughly repaired. The traditional thermal desorption process route is generally: the method comprises the following steps of (1) carrying out pretreatment such as crushing, screening and water content adjustment on contaminated soil, then feeding the contaminated soil into a rotary kiln for thermal desorption to obtain clean soil, and feeding the soil to a field to be detected after adding water and cooling; the separated tail gas enters a cyclone dust collector for dust removal and then enters a secondary combustion chamber for high-temperature combustion, the high-temperature flue gas from the secondary combustion chamber needs to be rapidly cooled from 900 ℃ to below 200 ℃ through a water-cooling or air-cooling quenching tower, and then enters a vertical or horizontal alkali spray tower for adsorption after being subjected to cloth bag dust removal and then is discharged through a chimney.
Polycyclic Aromatic Hydrocarbons (PAHs) are common soil organic pollutants and seriously threaten human health and ecological environment. If the technical route is adopted to treat the soil polluted by the polycyclic aromatic hydrocarbon, the problems of high energy consumption and high operation cost exist. Because adopt quench tower to quench 900 ~ 1000 ℃ high temperature flue gas below 200 ℃ can cause a large amount of energy extravagant, lead to becoming steam after a large amount of moisture gasifies moreover, very big increase the flue gas volume, increased the running load and the running cost of sack cleaner, lead to the volume of sack cleaner very big simultaneously, production manufacturing cost is higher. The air-cooled quench tower further increases the floor area of the equipment, and the noise generated in the operation process is larger.
Disclosure of Invention
Aiming at the problems of high energy consumption, high operation cost and the like of the existing soil thermal desorption technology, the invention provides a thermal desorption energy-saving system and method for repairing polycyclic aromatic hydrocarbon polluted soil.
The technical scheme of the invention is as follows:
a thermal desorption energy-saving system for repairing polycyclic aromatic hydrocarbon contaminated soil comprises an indirect heating rotary kiln, a flue gas dust removal device and a high-temperature oxidation chamber which are sequentially connected,
the indirect heating rotary kiln divide into one-level heating kiln and second grade heating kiln, constitutes by inner tube and urceolus, the entry linkage input conveyor belt of pending contaminated soil of one-level heating kiln inner tube, the export of one-level heating kiln inner tube is linked together with the entry of second grade heating kiln inner tube, the exit linkage output screw conveyer of the clean soil of second grade heating kiln inner tube, one-level heating kiln inner tube still in proper order with second grade heating kiln inner tube flue gas dust collector and high temperature oxidation room pass through gas pipeline intercommunication, the exhaust duct of high temperature oxidation room respectively with the urceolus intercommunication of one-level heating kiln and second grade heating kiln is used for heating the inner tube with indirect heating contaminated soil with letting in high temperature flue gas.
Including gas-gas exchanger, gas-gas exchanger includes inner tube and outer tube, the outer tube has flue gas inlet, exhanst gas outlet, the inner tube has fresh air inlet and fresh air outlet, flue gas inlet connects the high temperature flue gas after the export of the urceolus of one-level heating kiln and second grade heating kiln is in order to let in the heat transfer, exhanst gas outlet accesss to the chimney, fresh air inlet lets in the normal atmospheric temperature air, fresh air outlet accesss to the combustor of high temperature oxidation room is as combustion air with letting in the fresh air after being warmed up by the indirect heating of flue gas in gas-gas exchanger, the high temperature oxidation room includes that fuel inlet is used for letting in natural gas or petroleum gas.
The primary heating kiln inner cylinder and the secondary heating kiln inner cylinder as well as the secondary heating kiln and the screw conveyer are connected through double-layer flap valves.
The flue gas dust removal device comprises a cyclone separator and a bag-type dust remover which are sequentially connected, and a gas inlet of the cyclone separator is communicated with the inner cylinder of the secondary heating kiln through the gas pipeline; and an exhaust port of the bag-type dust collector is communicated with the high-temperature oxidation chamber.
The conveying belt is provided with a scale for measuring soil and a magnetic separator for removing metal block materials in the soil, and a tap water inlet is formed in the spiral conveyor and used for introducing tap water to be sprayed on the soil.
A thermal desorption energy-saving method for repairing polycyclic aromatic hydrocarbon contaminated soil comprises the following steps: the contaminated soil to be treated is sequentially input into the inner cylinders of the primary heating kiln and the secondary heating kiln through the conveying belt for thermal desorption; the soil after thermal desorption is output to a workshop to be detected through a screw conveyor, the flue gas after thermal desorption is dedusted by a flue gas dedusting device and then is conveyed to a high-temperature oxidation chamber for combustion so as to carry out high-temperature combustion degradation on organic pollutants in the flue gas, the high-temperature flue gas generated in the high-temperature oxidation chamber is respectively introduced into the outer cylinders of the primary heating kiln and the secondary heating kiln for indirectly heating the soil in the inner cylinder for thermal desorption,
the temperature of the high-temperature flue gas is above 900 ℃, the unearthing temperature of the primary heating kiln is 300 ℃ in addition to 100 ℃, and the unearthing temperature of the secondary heating kiln is 500 ℃ in addition to 300 ℃.
The high-temperature flue gas of the high-temperature oxidation chamber enters the gas exchanger after passing through the outer cylinder of the heating kiln for heat exchange, and fresh air passes through the gas exchanger to exchange heat with the flue gas and rise the temperature to flow to the combustor of the high-temperature oxidation chamber as combustion-supporting air and then is mixed with natural gas or petroleum gas and tail gas which are introduced into the combustor for combustion.
Soil in the primary heating kiln flows to the secondary heating kiln through a double-layer flap valve, smoke of the primary heating kiln is conveyed to the secondary heating kiln through a gas pipeline, and soil in the secondary heating kiln flows to the screw conveyor through the double-layer flap valve.
The tail gas after thermal desorption sequentially passes through a cyclone separator and a bag-type dust collector to respectively remove large-particle dust and fine-particle dust.
The method comprises the steps of firstly crushing, screening and adjusting the water content of the polluted soil to be treated, then inputting the polluted soil into an inner cylinder of a primary heating kiln through a conveying belt, metering the soil in the conveying process and removing metal blocky substances in the soil.
The invention has the beneficial technical effects that:
the invention relates to a thermal desorption energy-saving system for repairing polycyclic aromatic hydrocarbon contaminated soil, which is based on the deep thinking and analysis of an inventor: the quench tower in the prior art reduces the high-temperature flue gas to a lower temperature at a high speed, which is convenient for emission and prevents the flue gas generated after the combustion of chlorine-containing organic pollution in the cooling process from being resynthesized into dioxin pollutants, polycyclic aromatic hydrocarbon pollutants do not contain chlorine, dioxin is not generated in the cooling process after the incineration degradation, and the extreme speed cooling is not needed, so the quench tower is removed, the system is designed to comprise an indirect heating rotary kiln, a flue gas dust removal chamber and a high-temperature oxidation chamber which are sequentially connected, the high-temperature oxidation chamber is communicated with an outer cylinder of the heating kiln through a gas pipeline, and the thermal desorption process is designed as follows: high-temperature flue gas with the temperature of over 900 ℃ generated by high-temperature combustion of organic pollution gas in the high-temperature oxidation chamber is introduced into the outer cylinders of the primary and secondary heating kilns to indirectly heat the polluted soil in the inner cylinders, so that on one hand, the heat of the high-temperature flue gas is fully utilized, the high-temperature flue gas behind the high-temperature oxidation chamber is ensured to be fully utilized, and dioxin is not generated even if the temperature is slowly reduced; on the other hand, because the kiln body of the heating kiln is divided into two stages, the polluted soil is heated by the high-temperature smoke in two stages, the temperature of the soil is sequentially raised, the problems that the soil is sintered due to rapid temperature rise, pollutants are blocked in soil particles, and complete desorption cannot be realized are solved, and the defects that the kiln body is too long and the transportation is inconvenient due to the use of a single kiln body can be avoided; meanwhile, the high-temperature flue gas is indirectly heated to the soil, so that the high-temperature flue gas is not mixed with thermal desorption tail gas, the amount of waste gas containing organic pollutants is reduced, the high-temperature flue gas is not in direct contact with the polluted soil, the dust generation amount can be greatly reduced, the operation load and the cost of the bag-type dust remover are reduced, the size of the corresponding bag-type dust remover is small, and the occupied area is reduced. In conclusion, the thermal desorption system does not use a quench tower, but uses high-temperature flue gas for indirectly heating soil to perform two-stage thermal desorption, fully utilizes waste heat, has the advantages of energy conservation, low operation cost, less equipment and small occupied area, and is most suitable for treating polycyclic aromatic hydrocarbon polluted soil.
The high-temperature flue gas is reduced from 900 ℃ to about 500 ℃ after the waste heat in the heating kiln is utilized, the primary heating kiln and the secondary heating kiln respectively make the unearthed temperature be 100-300 ℃ and 300-500 ℃ through indirect heating, which is enough to meet the requirement of thermal desorption of polycyclic aromatic hydrocarbon and achieve the aim of restoration. Furthermore, this middle temperature flue gas lets in gas exchanger and preheats combustion air, not only can improve combustion-supporting wind's temperature, does benefit to the abundant burning and the degradation of thermal desorption tail gas and reduces unnecessary natural gas consumption, and the surplus heat of make full use of high temperature flue gas moreover, and the cooling process can not produce dioxin yet.
The inside running water entry that is equipped with of screw conveyer lets in the running water when carrying high temperature pollution soil to come out and sprays to soil to reduce soil temperature, restrain the production of screw conveyer export raise dust simultaneously.
Preferably, the flue gas dust removal device comprises a cyclone separator and a bag-type dust remover which are sequentially connected, wherein the cyclone separator is used for removing large-particle dust, and the bag-type dust remover is used for removing fine-particle dust.
Drawings
FIG. 1 is a schematic view of an embodiment of the thermal desorption energy-saving system for remediating polycyclic aromatic hydrocarbon contaminated soil according to the invention;
fig. 2 is a schematic flow diagram of an embodiment of the thermal desorption energy-saving method for repairing polycyclic aromatic hydrocarbon-contaminated soil according to the invention.
Reference numerals: 1-indirect heating rotary kiln, 11-first-stage heating kiln, 12-second-stage heating kiln, 2-flue gas dust removal device, 21-cyclone separator, 22-bag dust remover, 3-high temperature oxidation chamber, 4-gas heat exchanger, 5-screw conveyer, 61-inner cylinder, 62-outer cylinder, 7-induced draft fan, 8-chimney and 9-blower.
Detailed Description
For the purpose of clearly illustrating the contents of the present invention, reference will be made to the accompanying drawings 1-2 and the detailed description of the embodiments.
Example 1
An ectopic thermal desorption energy-saving system for repairing polycyclic aromatic hydrocarbon contaminated soil of this embodiment, as shown in fig. 1, this system mainly includes indirect heating rotary kiln 1, flue gas dust collector 2, high temperature oxidation chamber 3 that connect gradually. The indirect heating rotary kiln 1 comprises a first-stage heating kiln 11 and a second-stage heating kiln 12, the two heating kilns are indirect heating modes and respectively comprise an inner barrel 61 and an outer barrel 62, the inner barrels 61 of the two heating kilns are connected with each other through a double-layer flap valve and a gas pipeline, an inlet connection conveying belt of the first-stage heating kiln 11 is used for inputting the to-be-treated polluted soil into the first-stage heating kiln 11 from a pretreatment greenhouse, and an outlet of the inner barrel 61 of the second-stage heating kiln 12 is connected with a screw conveyor 5 through the double-layer flap valve to convey the clean soil to a workshop to be detected. The flue gas dust removal device 2 comprises a cyclone separator 21 and a bag-type dust remover 22 which are connected in sequence and used for removing large-particle dust and fine-particle dust in thermal desorption tail gas. The gas inlet of the cyclone separator 21 is communicated with the inner cylinder 61 of the secondary heating kiln 12 through a pipeline, the gas outlet of the cyclone separator 21 is connected with the gas inlet of the bag-type dust collector 22, and the exhaust port of the bag-type dust collector 22 is communicated with the high-temperature oxidation chamber 3. Natural gas or petroleum gas fuel is also introduced into the high-temperature oxidation chamber 3, the tail gas after thermal desorption, namely organic pollutants of which the main components are polycyclic aromatic hydrocarbon, is thoroughly incinerated and degraded in the high-temperature oxidation chamber 3, and the high-temperature flue gas is respectively communicated with the outer cylinders 62 of the primary heating kiln 11 and the secondary heating kiln 12 through exhaust pipelines so as to be introduced into the two heating kilns for indirectly heating the soil by the heating inner cylinders 61 for thermal desorption.
In order to further realize the cascade utilization of the waste heat of the high-temperature flue gas, the system also comprises a gas-gas heat exchanger 4 which is also called a flue gas heat exchanger or GGH. The gas-gas heat exchanger 4 comprises an inner pipe and an outer pipe, the inlet of the outer pipe is communicated with the outlets of the outer cylinders 62 of the primary heating kiln 11 and the secondary heating kiln 12 so as to introduce cooled high-temperature flue gas or intermediate-temperature flue gas, and the outlet of the outer pipe is communicated with a chimney 8 through an induced draft fan 7; fresh air is introduced into the inlet of the inner pipe through a blower 9, and the fresh air exchanges heat with the medium-temperature flue gas and is heated up to be used as combustion-supporting gas and then is led to the high-temperature oxidation chamber 3 through the outlet of the inner pipe and a pipeline.
Example 2
The thermal desorption energy-saving method for repairing polycyclic aromatic hydrocarbon contaminated soil of the embodiment, as shown in fig. 2, includes the following steps:
soil pretreatment: the method comprises the following steps of excavating polluted soil, conveying the polluted soil to a pretreatment greenhouse, crushing, screening, adding a certain proportion of quicklime to adjust the water content, conveying the polluted soil to an inlet of a primary heating kiln 11 through a conveying belt, and arranging a scale and a magnetic separator on the conveying belt for respectively metering the fed soil and removing iron block materials in the soil;
two-stage thermal desorption: the pretreated polluted soil enters an inner cylinder 61 of a first-stage heating kiln 11 for preheating and first-stage thermal desorption, the unearthing temperature of the first-stage heating kiln 11 is 100-plus-300 ℃, the treatment time is 20-30min, then the polluted soil flows from the first-stage heating kiln 11 to a second-stage heating kiln 12 through a double-layer flap valve for second-stage thermal desorption, waste gas containing organic pollutants is connected with the second-stage heating kiln 12 through a gas pipeline, the temperature in the second-stage heating kiln 11 is 200-plus-500 ℃, and the treatment time is 20-30 min;
and (3) soil recovery: the clean soil obtained by the treatment of the secondary heating kiln 12 flows to the screw conveyer 5, water is added into the screw conveyer 5 for cooling and dust falling treatment, and the treated soil is collected and conveyed to a workshop to be detected for waiting for detection and acceptance;
flue gas dust removal: the thermal desorption tail gas flowing out of the secondary heating kiln 12 sequentially passes through a cyclone dust collector 21 and a bag-type dust collector 22 to remove large-particle dust, and then flows to the high-temperature oxidation chamber 3;
tail gas degradation: LNG fuel and combustion-supporting air are introduced into the high-temperature oxidation chamber 3, the organic pollutant tail gas after dust removal is thoroughly incinerated and degraded in the high-temperature oxidation chamber 3, the combustion temperature is above 900 ℃, and the retention time of the flue gas in the high-temperature oxidation chamber 3 is above 2 s;
and (3) waste heat utilization: the high temperature flue gas with the temperature of over 900 ℃ generated in the high temperature oxidation chamber 3 respectively flows to the outer cylinders 62 of the primary heating kiln 11 and the secondary heating kiln 12 to indirectly heat the polluted soil in the kiln, the temperature of the high temperature flue gas is reduced, for example, from 900 ℃ to 500 ℃, then the high temperature flue gas flows to the gas-gas heat exchanger 4 in a gathering manner, the high temperature flue gas is introduced into the outer tube of the heat exchanger, the fresh air at normal temperature is introduced into the inner tube of the heat exchanger through the blower 9, the fresh air is heated to 300 ℃ by the middle temperature flue gas and flows to the high temperature oxidation chamber 3 as combustion-supporting air, the temperature of the middle temperature flue gas is reduced to 100.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A thermal desorption energy-saving system for repairing polycyclic aromatic hydrocarbon contaminated soil is characterized by comprising an indirect heating rotary kiln, a flue gas dust removal device and a high-temperature oxidation chamber which are sequentially connected,
the indirect heating rotary kiln divide into one-level heating kiln and second grade heating kiln, constitutes by inner tube and urceolus, the entry linkage input conveyor belt of pending contaminated soil of one-level heating kiln inner tube, the export of one-level heating kiln inner tube is linked together with the entry of second grade heating kiln inner tube, the exit linkage output screw conveyer of the clean soil of second grade heating kiln inner tube, one-level heating kiln inner tube still in proper order with second grade heating kiln inner tube flue gas dust collector and high temperature oxidation room pass through gas pipeline intercommunication, the exhaust duct of high temperature oxidation room respectively with the urceolus intercommunication of one-level heating kiln and second grade heating kiln is used for heating the inner tube with indirect heating contaminated soil with letting in high temperature flue gas.
2. The system according to claim 1, characterized in that the system comprises a gas-gas exchanger, the gas-gas exchanger comprises an inner pipe and an outer pipe, the outer pipe is provided with a flue gas inlet and a flue gas outlet, the inner pipe is provided with a fresh air inlet and a fresh air outlet, the flue gas inlet is connected with outlets of outer cylinders of the primary heating kiln and the secondary heating kiln so as to introduce high-temperature flue gas after heat exchange, the flue gas outlet is communicated with a chimney, the fresh air inlet is communicated with normal-temperature air, the fresh air outlet is communicated with a burner of the high-temperature oxidation chamber so as to introduce fresh air which is indirectly heated and heated by the flue gas in the gas-gas exchanger as combustion-supporting air, and the high-temperature oxidation chamber comprises a fuel inlet for introducing natural gas or.
3. The system of claim 1, wherein the primary heating kiln inner cylinder and the secondary heating kiln and the screw conveyer are connected through a double-layer flap valve.
4. The system according to claim 1, wherein the flue gas dust removal device comprises a cyclone separator and a bag-type dust remover which are connected in sequence, and a gas inlet of the cyclone separator is communicated with the inner cylinder of the secondary heating kiln through the gas pipeline; and an exhaust port of the bag-type dust collector is communicated with the high-temperature oxidation chamber.
5. The system of claim 1, wherein the conveyor belt has a scale for measuring soil and a magnetic separator for removing metal lumps from the soil, and the screw conveyor has a tap water inlet therein for feeding tap water to be sprayed on the soil.
6. A thermal desorption energy-saving method for repairing polycyclic aromatic hydrocarbon contaminated soil is characterized by comprising the following steps: the contaminated soil to be treated is sequentially input into the inner cylinders of the primary heating kiln and the secondary heating kiln through the conveying belt for thermal desorption; the soil after thermal desorption is output to a workshop to be detected through a screw conveyor, the flue gas after thermal desorption is dedusted by a flue gas dedusting device and then is conveyed to a high-temperature oxidation chamber for combustion so as to carry out high-temperature combustion degradation on organic pollutants in the flue gas, the high-temperature flue gas generated in the high-temperature oxidation chamber is respectively introduced into the outer cylinders of the primary heating kiln and the secondary heating kiln for indirectly heating the soil in the inner cylinder for thermal desorption,
the temperature of the high-temperature flue gas is above 900 ℃, the unearthing temperature of the primary heating kiln is 300 ℃ in addition to 100 ℃, and the unearthing temperature of the secondary heating kiln is 500 ℃ in addition to 300 ℃.
7. The method according to claim 6, wherein the high-temperature flue gas of the high-temperature oxidation chamber enters an air exchanger after passing through an outer cylinder of the heating kiln for heat exchange, and fresh air passes through the air exchanger to exchange heat with the flue gas and then flows to a combustor of the high-temperature oxidation chamber as combustion-supporting air after being heated, and then is mixed with natural gas or petroleum gas and tail gas which are introduced into the combustor for combustion.
8. The method according to claim 6, wherein the soil in the primary heating kiln flows to the secondary heating kiln through a double-layer flap valve, the flue gas of the primary heating kiln is conveyed to the secondary heating kiln through a gas pipeline, and the soil in the secondary heating kiln flows to the screw conveyor through the double-layer flap valve.
9. The method of claim 6, wherein the thermally desorbed tail gas is passed sequentially through a cyclone and a bag-type dust collector to remove large particle dust and fine particle dust, respectively.
10. The method as claimed in claim 6, wherein the contaminated soil to be treated is first crushed, sieved, adjusted in water content and then conveyed via a conveyor belt to the inner drum of the primary heating kiln, and during the conveying process, the soil is metered and the metal lumps in the soil are removed.
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| CN111515238A (en) * | 2020-04-27 | 2020-08-11 | 浙江宜可欧环保科技有限公司 | Soil direct thermal desorption treatment method and equipment |
| CN112588807A (en) * | 2020-12-29 | 2021-04-02 | 中国科学院沈阳应用生态研究所 | Method for eluting aged aromatic hydrocarbon component adhered to clay mineral in petroleum-polluted soil |
| CN113894150A (en) * | 2021-09-03 | 2022-01-07 | 广西博世科环保科技股份有限公司 | Energy-saving efficient thermal desorption remediation method for organic contaminated soil |
| CN115301722A (en) * | 2022-10-09 | 2022-11-08 | 江苏盖亚环境科技股份有限公司 | Double-heat-source-reusing triple rotary kiln, double-layer rotary kiln and soil remediation system and process |
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