CN111250524A - Gas thermal desorption-steam enhanced gas-phase extraction in-situ coupling repair method for composite organic pollution site - Google Patents
Gas thermal desorption-steam enhanced gas-phase extraction in-situ coupling repair method for composite organic pollution site Download PDFInfo
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- CN111250524A CN111250524A CN202010042085.5A CN202010042085A CN111250524A CN 111250524 A CN111250524 A CN 111250524A CN 202010042085 A CN202010042085 A CN 202010042085A CN 111250524 A CN111250524 A CN 111250524A
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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
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Abstract
The invention discloses a gas thermal desorption-steam enhanced gas phase extraction in-situ coupling repair method for a composite organic pollution site, which comprises a high-temperature flue gas heating well, a steam injection well and a gas phase extraction well; high-temperature flue gas generated by the combustor is subjected to heat transfer through the high-temperature flue gas heating well to repair soil; and introducing flue gas returned from the high-temperature flue gas heating well into a steam generator, introducing softened water for generating steam into the steam generator, and generating steam by utilizing the heat of the flue gas to inject the steam into the steam injection well for steam-enhanced vapor extraction. The high-temperature flue gas generated by thermal desorption of fuel gas and softened water are used for generating steam for steam injection of steam-enhanced gas phase extraction, so that the internal coupling of GTR and SEE is really realized, the waste heat of the high-temperature flue gas is recovered, the waste heat utilization is realized, the remediation efficiency is greatly improved, and the method is particularly suitable for benzene series, petroleum hydrocarbon, polycyclic aromatic hydrocarbon and halogenated hydrocarbon composite organic pollution sites.
Description
Technical Field
The invention relates to an in-situ thermal remediation technology for a composite organic pollution site, in particular to a fuel gas thermal desorption-steam enhanced gas-phase extraction in-situ coupling remediation method for the composite organic pollution site.
Background
The heating temperature of the gas thermal desorption repair technology (GTR) is extremely high (700-900 ℃), almost all organic pollutants and part of volatile inorganic pollutants can be removed in situ after reaching standards, and the gas thermal desorption repair technology is not limited by factors such as complex geological conditions, hydrogeological conditions and the like, but the discharged flue gas reaches 550 ℃, the energy is wasted, the energy utilization rate is only 30-60%, and when the depth of a target region is removed to be deep, the heating temperature of the bottom of a common heating well is highest, the temperature of shallow soil is low, the target temperature is difficult to reach, and the phenomenon of uneven heating of the soil is easy to generate. Compared with other in-situ treatment technologies, the steam enhanced vapor extraction (SEE) treatment speed is higher, the required energy output is less, meanwhile, the excavation operation is not needed, the target compound is not needed to be injected into the underground, and the method has good compatibility with other in-situ treatment technologies. However, the coupling aspect of the two repair technologies of the fuel gas thermal desorption and the steam-enhanced gas phase extraction is reported in few documents, and the intrinsic real coupling of the two repair technologies is not mentioned.
Disclosure of Invention
The invention aims to provide a gas thermal desorption-steam enhanced gas phase extraction in-situ coupling repair method for a composite organic pollution site.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a gas thermal desorption-steam enhanced gas phase extraction in-situ coupling repair method for a composite organic pollution site, which comprises a high-temperature flue gas heating well, a steam injection well and a gas phase extraction well;
high-temperature flue gas generated by the combustor is subjected to heat transfer through the high-temperature flue gas heating well to repair soil;
and introducing the flue gas returned from the high-temperature flue gas heating well into a steam generator, introducing softened water for generating steam into the steam generator, and generating steam by using the heat of the flue gas to inject the steam into the steam injection well for steam-enhanced vapor extraction.
According to the technical scheme provided by the invention, the gas thermal desorption-steam enhanced gas phase extraction in-situ coupling restoration method for the composite organic pollution site, which is provided by the embodiment of the invention, is based on the steam generator, and generates steam by using high-temperature flue gas generated by gas thermal desorption and softened water added externally, and is used for steam injection of steam enhanced gas phase extraction, so that the inherent coupling of GTR and SEE is really realized, meanwhile, the waste heat of the high-temperature flue gas is recovered, the waste heat utilization is realized, and the restoration efficiency is greatly improved.
Drawings
Fig. 1 is a schematic flow chart of a gas thermal desorption-steam enhanced gas-phase extraction in-situ coupling repair method for a composite organic pollution site provided by the embodiment of the invention.
Detailed Description
The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
The invention discloses a gas thermal desorption-steam enhanced gas phase extraction in-situ coupling repair method for a composite organic pollution site, which has the preferred specific implementation mode that:
comprises a high-temperature flue gas heating well, a steam injection well and a vapor phase extraction well;
high-temperature flue gas generated by the combustor is subjected to heat transfer through the high-temperature flue gas heating well to repair soil;
and introducing the flue gas returned from the high-temperature flue gas heating well into a steam generator, introducing softened water for generating steam into the steam generator, and generating steam by using the heat of the flue gas to inject the steam into the steam injection well for steam-enhanced vapor extraction.
Before coupling repair, firstly, a coupling mode and a coupling proportion which are suitable for different site characteristics and repair requirements are determined.
According to different coupling modes, if the steam generated by the waste heat of the flue gas cannot meet the requirement of a steam injection well, the steam is generated by an external energy source according to the situation.
The external energy source comprises electric energy, natural gas or industrial waste steam.
The invention relates to a gas thermal desorption-steam enhanced gas phase extraction in-situ coupling restoration method for a composite organic pollution site, which is used for firstly determining a coupling mode and a coupling proportion which are suitable for different site characteristics and restoration requirements according to respective technical advantages of restoration temperature, restoration period, energy efficiency, pollutant removal efficiency, low-permeability soil adaptability, high-water-content soil adaptability and the like and coupling GTR and SEE aiming at the composite organic pollution site of benzene series, petroleum hydrocarbon, polycyclic aromatic hydrocarbon and halogenated hydrocarbon. Then, high-temperature combustion gas generated by gas thermal desorption is subjected to heat transfer through a heating well to repair soil; flue gas returned from the heating well has a high temperature of about 550 ℃, is introduced into a steam generator such as a waste heat boiler, and simultaneously softened water for generating steam is introduced, and the flue gas heat generated by gas thermal desorption is utilized to generate steam for steam-enhanced vapor extraction. According to different coupling modes, if the steam generated by the waste heat of the high-temperature flue gas cannot meet the requirements of SEE, additional energy sources (electric energy, natural gas, industrial waste steam and the like) are added to generate steam according to the conditions. Therefore, the real internal coupling of GTR and SEE is realized, the desorption efficiency of GTR and SEE is fully exerted, and the thermal desorption efficiency and energy efficiency of single GTR are improved.
The invention is based on a steam generator, utilizes high-temperature flue gas generated by gas thermal desorption and additionally softened water to generate steam for steam injection of steam-enhanced vapor extraction, really realizes the internal coupling of GTR and SEE, simultaneously recovers the waste heat of the high-temperature flue gas, realizes the utilization of the waste heat, and greatly improves the repair efficiency.
The technique of the invention has the following advantages:
(1) the desorption efficiency of GTR and SEE is fully exerted, the thermal desorption efficiency obviously higher than that of single GTR or single SEE is obtained, and the application range of the polluted site is wider;
(2) the steam required by SEE is generated by using the waste heat of GTR flue gas, so that the real internal coupling of GTR and SEE is realized, the energy efficiency is improved, and the energy consumption is reduced.
The specific embodiment is as shown in fig. 1:
aiming at a benzene series, petroleum hydrocarbon, polycyclic aromatic hydrocarbon and halogenated hydrocarbon composite organic pollution site, from the aspects of restoration temperature, restoration period, energy efficiency, pollutant removal efficiency, low-permeability soil adaptability, groundwater level adaptability and the like, respective technical advantages of GTR and SEE are coupled, and firstly, a coupling mode and a coupling ratio (contribution ratio of GTR and SEE to restored soil) which are suitable for different site characteristics and restoration requirements are determined, and the specific details are shown in Table 1.
TABLE 1 GTR-SEE coupling mode and associated parameter correspondence matrix
For the coupling mode mainly based on GTR, the design of well distribution modes such as alternate distribution of GTR heating wells, steam injection wells and pollution gas extraction wells, the depth of various wells, well spacing (including spacing between different wells, spacing between similar wells and the like) and the like is adapted to the coupling mode mainly based on GTR and site characteristics, and the number of steam injection wells is small (less than that of GTR heating wells). When the composite organic pollution site is thermally repaired, natural gas and clean air are introduced into the gas thermal desorption combustor, and the natural gas and the clean air are mixed and combusted in the combustor to generate high-temperature combustion gas. The high-temperature combustion gas is injected into the heating well inner barrel and returns to the ground through the heating well outer barrel, the process realizes the transfer of the heat of the high-temperature combustion gas to the soil in a repairing area, the GTR repairing of a polluted site is realized, the high-temperature (about 550 ℃) flue gas after the heat conduction and the cooling of a soil layer is sucked by a negative-pressure combustion fan from the upper part of a GTR heating well main body and is introduced into steam generators such as a waste heat boiler, softened water for steam generation is introduced at the same time, and the steam is generated by utilizing the heat of the flue gas generated by the thermal desorption of the fuel gas. The flue gas after heat exchange enters a flue gas treatment system and is discharged after reaching the standard. These vapors are then injected underground through steam injection wells and spread in the soil layer to effect SEE remediation of the contaminated site. And extracting the polluted gas from the well by the polluted gas, and feeding the polluted gas into a precooler. In a precooler, the extracted gas phase pollutants enter a tail gas treatment device after being condensed, and the extracted gas phase pollutants reach the discharge standard. And (3) enabling the water (liquid) phase obtained after condensation to enter a tail water treatment device, and discharging up to the standard, wherein VOCs generated during tail water treatment are introduced into the tail water treatment device and discharged up to the standard. Therefore, GTR-SEE coupling accurate repair mainly based on GTR aiming at the composite organic pollution site is completed.
For the coupling mode mainly based on SEE, the design of well arrangement modes such as alternate distribution of GTR heating wells, steam injection wells and pollution gas extraction wells, the depth of various wells and well spacing (including spacing between different wells, spacing between similar wells and the like), and the like, the design is suitable for the coupling mode mainly based on GTR and site characteristics, and the number of steam injection wells is larger (more than the number of GTR heating wells). When the composite organic pollution site is thermally repaired, natural gas and clean air are introduced into the gas thermal desorption combustor, and the natural gas and the clean air are mixed and combusted in the combustor to generate high-temperature combustion gas. The high-temperature combustion gas is injected into the heating well inner barrel and returns to the ground through the heating well outer barrel, the process realizes the transfer of the heat of the high-temperature combustion gas to the soil in a repairing area, the GTR repairing of a polluted site is realized, the high-temperature (about 550 ℃) flue gas after the heat conduction and the cooling of a soil layer is sucked by a negative-pressure combustion fan from the upper part of a GTR heating well main body and is introduced into steam generators such as a waste heat boiler, softened water for steam generation is introduced at the same time, and the steam is generated by utilizing the heat of the flue gas generated by the thermal desorption of the fuel gas. The flue gas after heat exchange enters a flue gas treatment system and is discharged after reaching the standard. Then, the steam is injected into the underground through a steam injection well and diffused in the soil layer, and SEE remediation of the polluted site is realized. More importantly, the coupling mode mainly based on SEE, the steam generated by the waste heat of the high-temperature flue gas cannot meet the requirements of SEE. Therefore, the SEE remediation of the polluted site is realized by injecting steam into the ground through a steam injection well to generate steam by external energy (electric energy, natural gas and the like) or directly utilize nearby industrial waste steam which can be conveniently obtained. The polluted gas from the polluted gas extraction well enters a precooler. In a precooler, the extracted gas phase pollutants enter a tail gas treatment device after being condensed, and the extracted gas phase pollutants reach the discharge standard. And (3) enabling the water (liquid) phase obtained after condensation to enter a tail water treatment device, and discharging up to the standard, wherein VOCs generated during tail water treatment are introduced into the tail water treatment device and discharged up to the standard. Therefore, the GTR-SEE coupling precise repair mainly based on SEE aiming at the composite organic pollution site is completed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A fuel gas thermal desorption-steam enhanced gas phase extraction in-situ coupling repair method for a composite organic pollution site is characterized by comprising a high-temperature flue gas heating well, a steam injection well and a gas phase extraction well;
high-temperature flue gas generated by the combustor is subjected to heat transfer through the high-temperature flue gas heating well to repair soil;
and introducing the flue gas returned from the high-temperature flue gas heating well into a steam generator, introducing softened water for generating steam into the steam generator, and generating steam by using the heat of the flue gas to inject the steam into the steam injection well for steam-enhanced vapor extraction.
2. The gas thermal desorption-steam enhanced gas phase extraction in-situ coupling restoration method for the composite organic pollution site as claimed in claim 1, wherein before the coupling restoration, a coupling mode and a coupling ratio which are suitable for different site characteristics and restoration requirements are firstly determined.
3. The gas thermal desorption-steam enhanced gas phase extraction in-situ coupling repair method for the composite organic pollution site as claimed in claim 2, wherein if the steam generated by the waste heat of the flue gas cannot meet the requirement of a steam injection well according to different coupling modes, the steam is generated by an external energy source according to the situation.
4. The gas thermal desorption-steam enhanced gas phase extraction in-situ coupling repair method for the composite organic pollution site as claimed in claim 3, wherein the external energy source comprises electric energy, natural gas or industrial waste steam.
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| CN111804720A (en) * | 2020-07-01 | 2020-10-23 | 北京高能时代环境技术股份有限公司 | In-situ remediation method and remediation system for composite organic contaminated site |
| CN112496017A (en) * | 2020-11-12 | 2021-03-16 | 江苏大地益源环境修复有限公司 | In-situ heat conduction desorption system based on steam enhancement and process thereof |
| CN113172084A (en) * | 2021-05-10 | 2021-07-27 | 江苏大地益源环境修复有限公司 | Soil remediation system and method for enhancing thermal desorption effect |
| CN114054489A (en) * | 2020-07-30 | 2022-02-18 | 中国石油天然气股份有限公司 | Method for removing organic pollutants in formation by in-situ generation of multi-element thermal fluid |
| CN114345915A (en) * | 2021-12-31 | 2022-04-15 | 北京建工环境修复股份有限公司 | System and method for in-situ remediation of organic contaminated soil |
| CN114833187A (en) * | 2022-06-13 | 2022-08-02 | 西安西热锅炉环保工程有限公司 | In-situ thermal desorption structure for coprocessing of multi-pollutant field |
| CN115193904A (en) * | 2022-05-06 | 2022-10-18 | 江苏大地益源环境修复有限公司 | Method and device for strengthening remediation of polluted soil/underground water by using high-temperature flue gas |
| CN115415297A (en) * | 2022-09-20 | 2022-12-02 | 北京高能时代环境技术股份有限公司 | In-situ combined remediation system and method for contaminated site treatment |
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| CN111804720A (en) * | 2020-07-01 | 2020-10-23 | 北京高能时代环境技术股份有限公司 | In-situ remediation method and remediation system for composite organic contaminated site |
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| CN115193904A (en) * | 2022-05-06 | 2022-10-18 | 江苏大地益源环境修复有限公司 | Method and device for strengthening remediation of polluted soil/underground water by using high-temperature flue gas |
| CN114833187A (en) * | 2022-06-13 | 2022-08-02 | 西安西热锅炉环保工程有限公司 | In-situ thermal desorption structure for coprocessing of multi-pollutant field |
| CN115415297A (en) * | 2022-09-20 | 2022-12-02 | 北京高能时代环境技术股份有限公司 | In-situ combined remediation system and method for contaminated site treatment |
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