CN111346908B - Device and method for thermally repairing organic contaminated soil in segmented mode - Google Patents
Device and method for thermally repairing organic contaminated soil in segmented mode Download PDFInfo
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- CN111346908B CN111346908B CN202010268923.0A CN202010268923A CN111346908B CN 111346908 B CN111346908 B CN 111346908B CN 202010268923 A CN202010268923 A CN 202010268923A CN 111346908 B CN111346908 B CN 111346908B
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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
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Abstract
The invention relates to a device and a method for thermally repairing organic contaminated soil in a sectional manner, and belongs to the field of soil repair. The organic contaminated soil is sent to a stirring type preheating device and is subjected to indirect heat exchange with a circulating heat exchange medium in the device, the organic contaminated soil is continuously stirred and heated, water and light organic pollutants in the soil are separated out in the heating process, and the organic contaminated soil is sent to a non-condensable gas storage tank for storage after being condensed by a condensing device A; the preheated soil is sent into a thermal desorption device to carry out direct contact heat exchange with high-temperature noncondensable gas from a combustion heat exchanger, the preheated soil is heated to a higher temperature, residual organic pollutants in the soil undergo thermal desorption reaction, desorption gas products are sent into a condensing device B to be condensed, condensate enters a condensate storage tank, the high-temperature soil after thermal desorption is sent into a particle bed air cooling device, micro-combustion reaction is carried out on residual trace organic matters in the high-temperature soil and oxygen in the air, the oxygen is cooled down by the air, and finally the trace organic matters are discharged in a low-temperature clean soil mode.
Description
Technical Field
The invention belongs to the field of soil remediation, and particularly relates to a device and a method for thermally remediating organic contaminated soil in a segmented manner.
Background
With the acceleration of urban and industrialized processes in China, the proportion of organic contaminated soil is increased year by year, and the soil with high organic content can transfer pollutants to crops along with agricultural planting and then enter human bodies through food chains, so that the human health is seriously endangered. Thus, the management of soil pollution has been hampered.
At present, the thermal remediation type of the organic contaminated soil mainly adopts an incineration technology and a thermal desorption technology, and the incineration treatment equipment has complex supporting facilities, large occupied area and high investment and operation cost; while the thermal analysis method is considered as one of the technologies for treating the organic contaminated soil, the conventional thermal analysis method has the problems of low heat exchange efficiency, high process energy consumption and the like, and the development of the technology is severely restricted.
Disclosure of Invention
In order to overcome the defects of the existing production process, the invention provides a device and a method for thermally repairing organic contaminated soil in a sectional manner, wherein energy contained in the organic contaminated soil is used for the graded heat treatment of the organic contaminated soil, so that the energy consumption of the process is reduced, the generation amount of pollutants in the process is reduced, the running cost is greatly reduced, and the device and the method are convenient for industrial application.
The technical scheme of the invention is as follows:
the device comprises a stirring type preheating device 1, a condensing device A2, a non-condensable gas storage tank 3, a combustion heat exchanger 4, a condensing device B5, a condensate storage tank 6, a thermal analysis device 7, a granular bed air cooling device 8 and a flue gas washing device 9;
the gas outlet of the stirring type preheating device 1 is connected with a condensing device A2, a circulating heat exchange medium flow channel is arranged in the stirring type preheating device 1 and is used for receiving a high-temperature circulating heat exchange medium from a condensing device B5, and a low-temperature circulating heat exchange medium after heat release is introduced into the condensing device B5, and the preheated soil outlet of the stirring type preheating device 1 is connected with a thermal analysis device 7;
the outlet of the condensing device A2 is connected with a non-condensable gas storage tank 3;
the non-condensable gas storage tank 3 receives and stores non-condensable gas from the condensing device A2 and the condensing device B5, and a low-temperature non-condensable gas outlet of the non-condensable gas storage tank 3 is connected with the combustion heat exchanger 4;
a heat exchange tube bundle is arranged in the combustion heat exchanger 4, low-temperature non-condensable gas from the non-condensable gas storage tank 3 is received in the heat exchange tube bundle, preheated air from the liquid tar and granular bed air cooling device 8 of the condensate storage tank 6 is received in the heat exchange tube bundle, a high-temperature non-condensable gas outlet of the combustion heat exchanger 4 is connected with the thermal analysis device 7, and a flue gas outlet is connected with the flue gas washing device 9;
a condensing tube bundle is arranged in the condensing device B5, a low-temperature circulating heat exchange medium from the stirring type preheating device 1 circulates in the condensing tube bundle, a thermal desorption high-temperature gas product from the thermal desorption device 7 circulates outside the condensing tube bundle, and a condensate outlet of the condensing device B5 is connected with a condensate storage tank 6;
the liquid tar is separated from water in the condensate storage tank 6, and the separated liquid tar is sent to the combustion heat exchanger 4;
the high-temperature soil outlet of the thermal analysis device 7 is connected with the particle bed air cooling device 8;
the particulate bed air cooling device 8 is provided with an external air inlet and a preheated air outlet.
A method for thermally repairing organic contaminated soil in a sectional manner uses energy contained in the organic contaminated soil for the graded heat treatment thereof, and comprises the following steps:
i, stirring and drying: the organic contaminated soil to be treated is sent to a stirring type preheating device 1 and is subjected to indirect heat exchange with a high-temperature circulating heat exchange medium from a condensing device B5, the organic contaminated soil is continuously stirred and heated, gas separated out from the interior of the organic contaminated soil in the heating process is condensed by the condensing device A2 and then sent to a non-condensable gas storage tank 3 for storage, and the low-temperature circulating heat exchange medium after heat exchange is sent to the condensing device B5 for heat storage;
II, thermal analysis stage: the preheated soil is sent to a thermal desorption device 7 to carry out direct contact heat exchange with high-temperature noncondensable gas from a combustion heat exchanger 4, organic polluted soil is heated again and undergoes thermal desorption reaction, desorption gas products in the organic polluted soil are continuously separated out and sent to a condensing device B5, and the high-temperature soil with extremely low pollutant content after the thermal desorption reaction is finished is sent to a granular bed air cooling device 8;
III, energy recovery stage: indirectly exchanging heat between the high-temperature gas product after thermal analysis and a low-temperature circulating heat exchange medium in a condensing tube bundle in a condensing device B5, continuously heating the low-temperature circulating heat exchange medium, continuously condensing the high-temperature gas product after thermal analysis, sending liquid separated in the condensing process into a condensate storage tank 6 for storage, separating liquid tar from water in the condensate storage tank 6, sending the separated liquid tar into a combustion heat exchanger 4 for micro-combustion reaction with preheated air in the condensate storage tank, heating high-temperature flue gas generated in the combustion process into low-temperature non-condensing gas in the heat exchange tube bundle, sending the heated high-temperature non-condensing gas into a thermal analysis device 7, and sending the low-temperature flue gas into a flue gas washing device 9 for washing;
and IV, secondary purification and cooling stage: and after the thermal desorption reaction is finished, the high-temperature soil with extremely low organic pollutant content is sent into the granular bed air cooling device 8, meanwhile, external air is introduced into the granular bed air cooling device 8, on one hand, the air and trace organic matters remained in the soil undergo micro-combustion reaction, and further organic matters are removed, on the other hand, the high Wen Turang is cooled, and the secondarily purified soil is finally discharged in a form of low-temperature clean soil.
The temperature in the stirring type preheating device 1 is maintained at 90-150 ℃; the temperature in the thermal analysis device 7 is maintained at 400 to 700 ℃.
The invention has the beneficial effects that:
(1) The organic contaminated soil has high water content and high viscosity, and the segmented thermal repair technology is adopted, so that on one hand, the water can be removed firstly, the subsequent sensible heat consumption is reduced, and on the other hand, the soil viscosity can be reduced, and the subsequent treatment is facilitated.
(2) The whole process is completed below 700 ℃, so that volatilization of mineral elements in the soil can be reduced, and the fertility of the treated soil is ensured.
(3) When the content of the organic pollutants is above 8%, the whole process can be self-sustaining, and when the content of the organic pollutants is above 10%, part of resources can be even recycled by adopting the process.
Drawings
FIG. 1 is a schematic diagram of the structure of the whole device of the present invention.
In the figure: 1 a stirring type preheating device; 2 condensing device A;3, a non-condensable gas storage tank; 4, a combustion heat exchanger; 5 condensing unit B;6, a condensate storage tank; a thermal analysis device; 8 a granular bed air cooling device; 9 flue gas washing device.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and technical schemes.
Examples
The organic contaminated soil to be treated is sent to a stirring type preheating device 1 and is subjected to indirect heat exchange with a high-temperature circulating heat exchange medium from a condensing device B5, the organic contaminated soil is continuously stirred and heated, gas separated out from the interior of the organic contaminated soil in the heating process is condensed by the condensing device A2 and then sent to a non-condensable gas storage tank 3 for storage, and the high-temperature circulating heat exchange medium after heat exchange is sent to the condensing device B5 for heat storage; the preheated soil is sent to a thermal desorption device 7 to carry out direct contact heat exchange with high-temperature noncondensable gas from a combustion heat exchanger 4, organic polluted soil is heated again and undergoes thermal desorption reaction, desorption gas products in the organic polluted soil are continuously separated out and sent to a condensing device B5, and the high-temperature soil with extremely low pollutant content after the thermal desorption reaction is finished is sent to a granular bed air cooling device 8; indirectly exchanging heat between the high-temperature gas product after thermal analysis and a low-temperature circulating heat exchange medium in a condensing tube bundle in a condensing device B5, continuously heating the low-temperature circulating heat exchange medium, continuously condensing the high-temperature gas product after thermal analysis, sending liquid separated in the condensing process into a condensate storage tank 6 for storage, separating liquid tar from water in the condensate storage tank 6, sending the separated liquid tar into a combustion heat exchanger 4 for micro-combustion reaction with preheated air in the condensate storage tank, heating high-temperature flue gas generated in the combustion process into low-temperature non-condensing gas in the heat exchange tube bundle, sending the heated high-temperature non-condensing gas into a thermal analysis device 7, and sending the low-temperature flue gas into a flue gas washing device 9 for washing; and after the thermal analysis reaction is finished, the high-temperature soil with extremely low pollutant content is sent into the granular bed air cooling device 8, meanwhile, external air is introduced into the granular bed air cooling device 8, on one hand, the air and trace organic matters remained in the soil undergo micro-combustion reaction, and further organic matters are removed, on the other hand, the high Wen Turang is cooled, and the secondarily purified soil is finally discharged in a form of low-temperature clean soil. The temperature in the stirring type preheating device 1 is maintained at 90-150 ℃; the temperature in the thermal analysis device 7 is maintained at 400 to 700 ℃.
The present invention includes, but is not limited to, the present embodiment, and it should be noted that it will be apparent to those skilled in the art that other alternatives can be employed without departing from the technical principles of the present invention, and these alternatives should also be considered as the protective scope of the present invention.
Claims (4)
1. The device for the sectional type thermal remediation of the organic contaminated soil is characterized by comprising a stirring type preheating device (1), a condensing device A (2), a non-condensable gas storage tank (3), a combustion heat exchanger (4), a condensing device B (5), a condensate storage tank (6), a thermal desorption device (7), a granular bed air cooling device (8) and a flue gas washing device (9);
the gas outlet of the stirring type preheating device (1) is connected with the condensing device A (2), a circulating heat exchange medium circulating channel is arranged in the stirring type preheating device (1) and is used for receiving the high-temperature circulating heat exchange medium from the condensing device B (5) and introducing the low-temperature circulating heat exchange medium after heat release into the condensing device B (5), and the preheated soil outlet of the stirring type preheating device (1) is connected with the thermal analysis device (7);
the outlet of the condensing device A (2) is connected with a non-condensable gas storage tank (3);
the non-condensable gas storage tank (3) receives and stores non-condensable gas from the condensing device A (2) and the condensing device B (5), and a low-temperature non-condensable gas outlet of the non-condensable gas storage tank (3) is connected with the combustion heat exchanger (4);
a heat exchange tube bundle is arranged in the combustion heat exchanger (4), low-temperature non-condensable gas from the non-condensable gas storage tank (3) is received in the heat exchange tube bundle, and the heat exchange tube bundle receives preheated air from the liquid tar and particle bed air cooling device (8) of the condensate storage tank (6); the high-temperature non-condensable gas outlet of the combustion heat exchanger (4) is connected with a thermal analysis device (7), and the flue gas outlet is connected with a flue gas washing device (9);
a condensing tube bundle is arranged in the condensing device B (5), a low-temperature circulating heat exchange medium from the stirring type preheating device (1) circulates in the condensing tube bundle, a thermal desorption high-temperature gas product from the thermal desorption device (7) circulates outside the condensing tube bundle, and a condensate outlet of the condensing device B (5) is connected with a condensate storage tank (6);
the liquid tar is separated from water in the condensate storage tank (6), and the separated liquid tar is sent to the combustion heat exchanger (4);
the high-temperature soil outlet of the thermal analysis device (7) is connected with the granular bed air cooling device (8);
the granular bed air cooling device (8) is provided with an external air inlet and a preheated air outlet.
2. A method for the staged thermal remediation of organically-polluted soil using a staged thermal remediation apparatus as claimed in claim 1, wherein the energy contained in the organically-polluted soil is used for staged thermal treatment thereof, comprising the steps of:
stirring and drying stage: the organic contaminated soil to be treated is sent into a stirring type preheating device (1) to be subjected to indirect heat exchange with a high-temperature circulating heat exchange medium from a condensing device B (5), the organic contaminated soil is continuously stirred and heated, gas separated out from the interior of the organic contaminated soil in the heating process is condensed by a condensing device A (2) and then is sent into a non-condensable gas storage tank (3) to be stored, and the low-temperature circulating heat exchange medium after heat exchange is sent into the condensing device B (5) to be subjected to heat storage;
(II) thermal analysis stage: the preheated soil is sent to a thermal analysis device (7) to perform direct contact heat exchange with high-temperature noncondensable gas from a combustion heat exchanger (4), organic polluted soil is heated again and undergoes thermal analysis reaction, analysis gas products in the organic polluted soil are continuously separated out and sent to a condensing device B (5), and the high-temperature soil with extremely low pollutant content after the thermal analysis reaction is finished is sent to a granular bed air cooling device (8);
(III) energy recovery stage: indirectly exchanging heat between the high-temperature gas product after thermal analysis and a low-temperature circulating heat exchange medium in a condensation tube bundle in a condensing device B (5), continuously heating the low-temperature circulating heat exchange medium, continuously condensing the high-temperature gas product after thermal analysis, sending liquid separated out in the condensing process into a condensate storage tank (6) for storage, separating liquid tar from water in the condensate storage tank (6), sending the separated liquid tar into a combustion heat exchanger (4) for micro-combustion reaction with preheated air in the condensate storage tank, heating low-temperature non-condensable gas in the heat exchange tube bundle by high-temperature flue gas generated in the combustion process, sending the heated high-temperature non-condensable gas into a thermal analysis device (7), and sending the low-temperature flue gas into a flue gas washing device (9) for washing;
(IV) a secondary purification cooling stage: and after the thermal desorption reaction is finished, the high-temperature soil with extremely low organic pollutant content is sent into the granular bed air cooling device (8), meanwhile, external air is introduced into the granular bed air cooling device (8), on one hand, the air and trace organic matters remained in the soil undergo micro-combustion reaction, and further organic matters are removed, on the other hand, the high Wen Turang is cooled, and the secondarily purified soil is finally discharged in a form of low-temperature clean soil.
3. A method for the staged thermal remediation of organically contaminated soil according to claim 2, wherein the temperature in the stirred pre-heater (1) is maintained at 90-150 ℃.
4. A method for the staged thermal remediation of organically contaminated soil as claimed in claim 2 or 3, wherein,
the temperature in the thermal analysis device (7) is maintained at 400-700 ℃.
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- 2020-04-08 CN CN202010268923.0A patent/CN111346908B/en active Active
Patent Citations (7)
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| DE3706684A1 (en) * | 1986-04-08 | 1987-10-15 | Kurt Von Dipl Chem D Beckerath | METHOD FOR REMOVING VOLATILE POLLUTANTS FROM CONTAMINATED SOILS, SANDS, SLURRY AND COMPARABLE SOLID AGGREGATES AND RESIDUES |
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