CN111229803A - In-situ thermal desorption device and in-situ thermal desorption system - Google Patents
In-situ thermal desorption device and in-situ thermal desorption system Download PDFInfo
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- CN111229803A CN111229803A CN202010030636.6A CN202010030636A CN111229803A CN 111229803 A CN111229803 A CN 111229803A CN 202010030636 A CN202010030636 A CN 202010030636A CN 111229803 A CN111229803 A CN 111229803A
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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
- B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention provides an in-situ thermal desorption device and an in-situ thermal desorption system, and belongs to the technical field of soil thermal desorption. The in-situ thermal desorption device comprises a power supply module, a heating rod module and a closer module. The power supply module comprises a power supply shell and a first power transmission line, the first power transmission line is arranged in the power supply shell, two ends of the first power transmission line are respectively connected with two ends of the power supply shell, one end of the first power transmission line is used for being connected with a power supply source, the heating rod module comprises a heating rod shell and a thermal resistance wire, the thermal resistance wire is arranged in the heating rod shell, and two ends of the thermal resistance wire are respectively connected with two ends of the heating rod shell; the closer module comprises a closer shell and a closing line, and the closing line is arranged in the closer shell. The power supply module, the heating rod module and the closer module are manufactured through modularization production, and can be matched according to actual requirements, so that the production efficiency is greatly improved, and the overall applicability is high. The in-situ thermal desorption system comprising the in-situ thermal desorption device is convenient to use and high in industrial applicability.
Description
Technical Field
The invention relates to the technical field of soil thermal desorption, in particular to an in-situ thermal desorption device and an in-situ thermal desorption system.
Background
Thermal desorption is the process of heating the organic contaminant components in the soil to a sufficiently high temperature by heat exchange to volatilize and separate them from the soil medium. The thermal desorption technology has the advantages of wide pollutant treatment range, reusability of the repaired soil and the like, and particularly, the generation of dioxin can be obviously reduced by a non-oxidative combustion treatment mode for chlorine-containing organic matters such as PCBs.
At present, the thermal desorption technology of soil in Europe and America is widely applied to ex-situ or in-situ remediation of highly polluted site organic polluted soil, but the problems of high price of related equipment, overlong desorption time, overhigh treatment cost and the like are not well solved, and the application of the thermal desorption technology in the persistent organic polluted soil remediation is limited.
The domestic thermal desorption restoration technology of contaminated soil still takes the heterotopic treatment as the main thing, along with the continuous increase of environmental protection dynamics, for preventing secondary pollution such as the diffusion of organic pollutant, also domestic is being in the transition from heterotopic restoration to normal position restoration. The in-situ thermal desorption technology is used as an effective means for restoring the organic contaminated soil, and has wide application prospect. The in-situ thermal desorption can be divided into heat conduction heating, resistance heating and steam injection in-situ thermal desorption technologies according to different energy sources, the steam injection mode in the American in-situ thermal desorption technology is most applied, the developed in-situ thermal desorption repair engineering or field test engineering in China mostly adopts the heat conduction technology of gas heating and electric heating, only ten in-situ thermal desorption repair engineering and field test implementation are in the starting stage at present, and the corresponding in-situ thermal desorption equipment is still required to be further improved.
In view of this, the present application is specifically made.
Disclosure of Invention
One of the purposes of the invention comprises providing an in-situ thermal desorption device which can be matched according to actual requirements, realizes flexible combination in a modularized mode, greatly improves the production efficiency and has strong overall applicability.
The second objective of the present invention is to provide an in-situ thermal desorption system, which is convenient to use and has strong industrial applicability.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the invention provides an in-situ thermal desorption device, which comprises: the device comprises a power supply module, a heating rod module and a closer module. The power supply module comprises a power supply shell and a first power transmission line, the first power transmission line is arranged in the power supply shell, two ends of the first power transmission line are respectively connected with two ends of the power supply shell, and one end of the first power transmission line is used for being connected with a power supply source.
The heating rod module comprises a heating rod shell and a thermal resistance wire, the thermal resistance wire is arranged in the heating rod shell, and two ends of the thermal resistance wire are respectively connected with two ends of the heating rod shell.
The closer module includes a closer housing and a closing line disposed within the closer housing.
The in-situ thermal desorption device has an assembly state and a decomposition state: in an assembly state, the heating rod module is assembled between the power supply module and the closer module, and the first power transmission line, the thermal resistance wire and the closing line form a loop; the power supply module, the heating rod module and the closer module are mutually separated in the decomposition state.
Optionally, the in-situ thermal desorption device further comprises a cold end module, the cold end module comprises a cold end shell and a second transmission line, the second transmission line is arranged in the cold end shell, and two ends of the second transmission line are respectively connected with two ends of the cold end shell.
In an assembly state, the cold end module is assembled between the power supply module and the heating rod module, and the first power transmission line, the second power transmission line, the thermal resistance wire and the closed line form a loop; and under the decomposition state, the power supply module, the cold end module, the heating rod module and the closer module are mutually separated.
Optionally, the both ends of cold junction casing are provided with cold junction socket and cold junction plug respectively, and cold junction socket and cold junction plug are connected with the both ends electricity of second power transmission line respectively, and the cold junction socket is used for being connected with power module detachably, and the cold junction plug is used for being connected with heating rod module detachably.
In some embodiments, the cold end housing is made of stainless steel.
In some embodiments, the cold end modules are cylindrical in shape, with the cold end modules having a height of 500mm to 5000mm and a diameter of 30mm to 300 mm.
In some embodiments, the number of the cold end modules is multiple, and two adjacent cold end modules are connected end to end.
Optionally, the in-situ thermal desorption device further comprises an extraction well pipe module, and the extraction well pipe module comprises an extraction well pipe shell; in the assembled state, the heating rod module and the closer module are accommodated in the casing of the air extraction well pipe.
And under the decomposition state, the power supply module, the heating rod module, the closer module and the air pumping well pipe module are separated from each other.
Optionally, the air pumping well pipe module further comprises an air pumping well pipe interface, one end of the air pumping well pipe is open, and the heating rod module and the closer module are accommodated in the air pumping well pipe shell through the opening in an assembled state; the air pumping well pipe interface is connected with one end of the air pumping well pipe shell close to the opening.
In some embodiments, the end wall of the extraction casing at the end remote from the opening and the peripheral wall are provided with screening holes.
In some embodiments, the material of the extraction well tube is stainless steel.
Preferably, the pumping well pipe module is cylindrical, the height of the pumping well pipe module is 2000mm-30000mm, and the diameter of the pumping well pipe module is 50mm-350 mm.
In some embodiments, one end of the power supply housing is provided with a power supply plug electrically connected to the first power line, the power supply plug for detachably connecting the heating rod module.
In some embodiments, the power supply housing is made of stainless steel.
In some embodiments, the power module is cylindrical, the height of the power module is 100mm-1000mm, and the diameter of the power module is 30mm-300 mm;
in some embodiments, the power module further comprises a power connector secured to the power housing and electrically connected to one end of the first power line, the power connector for connecting to a power source.
Optionally, both ends of the heating rod shell are respectively provided with a heating socket and a heating plug, the heating socket and the heating plug are respectively electrically connected with both ends of the thermal resistance wire, the heating socket is used for being detachably connected with the power supply module, and the heating plug is used for being detachably connected with the closer module.
In some embodiments, the heating rod module further comprises magnesium oxide powder, and the magnesium oxide powder is filled in the heating rod shell.
In some embodiments, the number of the heating rod modules is multiple, and two adjacent heating rod modules are connected end to end.
In some embodiments, the heater rod module further comprises a stainless steel column fixed in the heater rod housing, and the thermal resistance wire is wound on the outer side of the stainless steel column.
In some embodiments, the heating rod modules are cylindrical in shape, the heating rod modules having a height of 1000mm to 5000mm and a diameter of 30mm to 300 mm.
Optionally, the closer housing is provided with a closing socket, the closing socket being connected with a closing wire, the closing socket being adapted for detachable connection with the heating rod module.
In some embodiments, the closer module is cylindrical, the height of the closer module is 10mm-200mm, and the diameter is 30mm-300 mm;
in some embodiments, the closed wire is a resistive wire.
The embodiment of the invention also provides an in-situ thermal desorption system, which comprises a power supply source and the in-situ thermal desorption device, wherein the power supply source is electrically connected with one end of the first power transmission line.
Optionally, the in-situ thermal desorption system further comprises a plurality of temperature detection devices, the in-situ thermal desorption devices are all used for being inserted into the ground and distributed in a regular polygon shape, and the temperature detection devices are arranged in the center of the regular polygon shape.
The application provides an in situ thermal desorption device and in situ thermal desorption system's beneficial effect includes:
in this normal position heat takes off device, power module, heating rod module and closer module are all made through the production of modularization, can arrange according to the demand of reality, improve production efficiency greatly, and whole suitability is strong. The in-situ thermal desorption system comprising the in-situ thermal desorption device is convenient to use and high in industrial applicability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of parts of the in-situ thermal desorption apparatus provided in this embodiment;
FIG. 2 is a schematic structural view of the closer module of FIG. 1;
FIG. 3 is a schematic structural diagram of the power supply module of FIG. 1;
FIG. 4 is a schematic diagram of the cold end module of FIG. 1;
FIG. 5 is a schematic structural view of the heating rod module of FIG. 1;
FIG. 6 is a schematic structural view of the pump-down module of FIG. 1;
fig. 7 is a schematic view of the in-situ thermal desorption apparatus provided in this embodiment in a first combination manner;
fig. 8 is a schematic view of the in-situ thermal desorption apparatus provided in this embodiment in a second combination manner.
Icon: 100-an in-situ thermal desorption device; 10-a power supply module; 11-a power supply housing; 111-supply plug; 12-a first transmission line; 13-power connection; 20-a heating rod module; 21-heating rod shell; 211-heating socket; 213-heating plug; 22-thermal resistance wire; 23-magnesium oxide powder; 24-resistance wire fixing column; 30-a closer module; 31-a closer housing; 311-a closed socket; 32-closed line; 40-cold end module; 41-cold end housing; 411-cold junction receptacle; 412-cold-end plug; 42-a second transmission line; 50-an extraction well pipe module; 51-pumping well pipe shell; 511-mesh screen; 52-suction well pipe interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The following is a detailed description.
The inventor discovers through research that due to the pollution condition of polluted site soil and underground water, the difference of hydrogeological conditions is huge, at present, the standardization difficulty of the product specification of the electric heating in-situ thermal desorption heating element is larger, the production needs to be customized according to requirements, the production efficiency is low, the equipment structure is fixed, the field changing recycling difficulty is large, and the waste of equipment resources is caused. The theoretical depth of pollutants treated by the in-situ thermal desorption technology can reach about 30m, the length of the heating element is long, and the transportation and hoisting construction difficulty of the customized integrated heating element is high. The existing in-situ thermal desorption extraction well has low temperature and high heating well temperature, and the desorption and extraction efficiency of pollutants in soil is low because part of the pollutants are condensed in the diffusion process from the vicinity of the heating well to the extraction well due to the temperature gradient from high to low. Therefore, the equipment for implementing the thermal desorption technology in the prior art needs to be customized and produced, and has low production efficiency and poor applicability.
The in-situ thermal desorption apparatus 100 provided in this embodiment can effectively alleviate this technical problem. In the present application, fig. 1 shows the components of the in-situ thermal desorption apparatus 100 in the present embodiment, fig. 2 to 6 show the components, respectively, and fig. 7 and 8 show different combinations of the components.
Referring to fig. 1 to 6, the in-situ thermal desorption apparatus 100 includes a power supply module 10, a heating rod module 20, a closer module 30, a cold end module 40, and an extraction tube module 50.
The power supply module 10 includes a power supply housing 11 and a first power line 12, the first power line 12 is disposed in the power supply housing 11, two ends of the first power line 12 are respectively connected to two ends of the power supply housing 11, and one end of the first power line 12 is used for being connected to a power supply. That is, one end of the first power line 12 is connected to one end of the power supply housing 11 and is used for connection to a power supply source, and the other end of the first power line 12 is connected to the other end of the power supply housing 11.
The heating rod module 20 includes a heating rod housing 21 and a heating wire 22, the heating wire 22 is disposed in the heating rod housing 21, and two ends of the heating wire 22 are respectively connected to two ends of the heating rod housing 21.
The closer module 30 includes a closer housing 31 and a closing wire 32, the closing wire 32 being disposed within the closer housing 31.
The in-situ thermal desorption apparatus 100 has an assembled state and a disassembled state. In the assembled state, the heating rod module 20 is assembled between the power supply module 10 and the closer module 30, and the first power line 12, the hot wire 22 and the closing line 32 form a loop.
In the disassembled state, the power module 10, the heating rod module 20, and the closer module 30 are separated from each other.
In this embodiment, the number of the first power lines 12 is two, the number of the thermal resistance wires 22 is two, and the closing line 32 is arc-shaped, and in the assembled state, the two first power lines 12 are respectively connected to the two thermal resistance wires 22, and the two thermal resistance wires 22 are respectively connected to the two free ends of the closing line 32. When the power supply is connected with the first power lines 12, current passes through one of the first power lines 12, one of the thermal resistance wires 22, the closing line 32, the other thermal resistance wire 22 and the other first power line 12 to form a loop, and the two thermal resistance wires 22 are electrified to generate heat. After the heating rod module 20 is inserted into the ground, the soil can be heated, and thermal desorption of the soil can be realized. In the disassembled state, the power module 10, the heating rod module 20, and the closer module 30 may be separated from each other for easy transportation.
In the above-mentioned normal position thermal desorption device 100, power module 10, heating rod module 20 and closer module 30 are all made through the production of modularization, can arrange according to the demand of reality, improve production efficiency greatly, and whole suitability is strong.
With reference to fig. 1 and fig. 4, in this embodiment, the cold end module 40 includes a cold end housing 41 and a second power line 42, the second power line 42 is disposed in the cold end housing 41, and two ends of the second power line 42 are respectively connected to two ends of the cold end housing 41. In the assembled state, the cold end module 40 is assembled between the power module 10 and the heating rod module 20, and the first power line 12, the second power line 42, the hot wire 22 and the closing line 32 form a loop. In the disassembled state, the power module 10, the cold end module 40, the heating rod module 20, and the closer module 30 are disengaged from each other.
Where some contaminated soil is deep underground, the depth may be extended by cold end modules 40, it being understood that the cold end modules 40 are inserted into the ground but do not substantially heat the soil. The second transmission line 42 is also two in number so as to constitute a loop.
Referring to fig. 1 and 6, in the present embodiment, the pump tube module 50 includes a pump tube housing 51. In the assembled state, the heater rod module 20 and the closer module 30 are housed within the extraction casing 51. In the disassembled state, the power supply module 10, the heating rod module 20, the closer module 30, and the pumping well pipe module 50 are separated from each other.
The existing in-situ thermal desorption extraction well has low temperature and high temperature of the heating well, and the desorption and extraction efficiency of pollutants in soil is low because part of the pollutants are condensed in the diffusion process from the vicinity of the heating well to the extraction well due to the temperature gradient from high to low. The heating rod module 20 and the closer module 30 are accommodated through the pumping well pipe shell 51, so that the desorption and extraction efficiency of pollutants in soil can be improved.
Referring to fig. 2, in the present embodiment, the closer housing 31 is provided with a closed socket 311, the closed socket 311 is connected with the closed wire 32, and the closed socket 311 is used for detachably connecting with the heating rod module 20.
Referring to fig. 3, in the present embodiment, a power supply plug 111 is provided at one end of the power supply housing 11, the power supply plug 111 is electrically connected to the first power line 12, and the power supply plug 111 is used for detachably connecting the heating rod module 20.
With reference to fig. 4, in this embodiment, the two ends of the cold end housing 41 are respectively provided with a cold end socket 411 and a cold end plug 412, the cold end socket 411 and the cold end plug 412 are respectively electrically connected to the two ends of the second power transmission line 42, the cold end socket 411 is detachably connected to the power supply module 10, and the cold end plug 412 is detachably connected to the heating rod module 20.
Referring to fig. 5, in the present embodiment, the heating rod housing 21 is provided with a heating socket 211 and a heating plug 213 at two ends thereof, the heating socket 211 and the heating plug 213 are electrically connected to two ends of the heating wire 22, respectively, the heating socket 211 is configured to be detachably connected to the power supply module 10, and the heating plug 213 is configured to be detachably connected to the closer module 30.
It will be appreciated that the above components may be removable by plugging, for example, the power module 10 is plugged into the cold end module 40, the cold end module 40 is plugged into the heating rod module 20, and the heating rod module 20 is plugged into the closer module 30, in the state shown in fig. 7.
For example, the power supply module 10 is inserted into the heating rod module 20, the heating rod module 20 is inserted into the closer module 30 and is inserted into the pumping tube module 50 as a whole, so that the heating rod module 20 and the closer module 30 are accommodated in the pumping tube module 50, and the power supply module 10 is located outside the pumping tube module 50, assuming a state as shown in fig. 8.
In connection with fig. 2, the shutter module 30 is preferably cylindrical, and the height of the shutter module 30 may be 10mm-200mm, such as 10mm, 100mm or 200 mm. In this embodiment, the height of the shutter module 30 is 50 mm. Preferably, the diameter of the shutter module 30 may be 30mm-300 mm. Such as 30mm, 150mm or 300mm, etc. In this embodiment, the diameter of the shutter module 30 is 100 mm.
Preferably, the closure wire 32 is a resistance wire, in which case the closure module 30 will also act to some extent to heat the soil.
Referring to fig. 3, the power supply module 10 is preferably cylindrical, and the height of the power supply module 10 may be 100mm-1000mm, such as 100mm, 600mm or 1000 mm. In this embodiment, the height of the power supply module 10 is 500 mm. Preferably, the diameter of the shutter module 30 may be 30mm-300mm, such as 30mm, 150mm or 300mm, etc. In this embodiment, the diameter of the shutter module 30 is 100 mm.
Preferably, the power supply module 10 further comprises a power connector 13, the power connector 13 being fixed to the power supply housing 11 and electrically connected to one end of the first power line 12, the power connector 13 being adapted to be connected to a power supply source. The power connector 13 facilitates the user to adapt the connector of the power supply to the power connector, thereby improving the convenience of operation.
Preferably, the power supply housing 11 is made of stainless steel to improve the service life.
With reference to fig. 4, preferably, the cold end module 40 is cylindrical, and the height of the cold end module 40 may be 500mm to 5000mm, such as 500mm, 2000mm or 5000 mm. In this embodiment, the height of the cold end module 40 is 1000 mm. Preferably, the diameter of the cold end module 40 may be 30mm-300mm, such as 30mm, 150mm or 300 mm. In this embodiment, the diameter of the cold end module 40 is 100 mm.
Preferably, the cold end housing 41 is made of stainless steel to improve the service life.
Preferably, there are a plurality of cold end modules 40, and two adjacent cold end modules 40 are connected end to end. The user can correspond the quantity of selecting cold end module 40 according to the difference of soil pollution degree of depth.
Referring to fig. 5, preferably, the heating rod module 20 has a cylindrical shape, and the height of the heating rod module 20 may be 1000mm to 5000mm, such as 1000mm, 3000mm or 5000 mm. In this embodiment, the heating rod module 20 has a height of 1500 mm. Preferably, the diameter of the heating rod module 20 may be 30mm-300mm, such as 30mm, 150mm, or 300mm, etc. In this embodiment, the diameter of the heating rod module 20 is 100 mm.
Preferably, the heating rod module 20 further includes magnesium oxide powder 23, and the magnesium oxide powder 23 is filled in the heating rod housing 21. The magnesium oxide powder 23 can improve the heating effect.
Preferably, the number of the heating rod modules 20 is plural, and two adjacent heating rod modules 20 are connected end to end. The user can select the number of the heating rod modules 20 according to the heating depth.
Preferably, the heating rod module 20 further includes a resistance wire fixing post 24, the resistance wire fixing post 24 is fixed in the heating rod housing 21, and the heating resistance wire 22 is wound on the outer side of the resistance wire fixing post 24. The resistance wire fixing column 24 is made of 310s stainless steel with the surface coated with ceramic, and the thermal resistance wire 22 can be prevented from being deformed and broken by being heated for a long time through winding.
Referring to fig. 6, the pumping well pipe module 50 is preferably cylindrical, and the height of the pumping well pipe module 50 may be 2000mm-30000mm, such as 2000mm, 10000mm or 30000 mm. In this embodiment, the pump tube module 50 is 1600mm high. Preferably, the diameter of the pumping well pipe module 50 may be 50mm to 350mm, such as 50mm, 200mm or 350 mm. In this embodiment, the diameter of the pump-down module 50 is 150 mm.
In this embodiment, the pump-down-pipe module 50 further comprises a pump-down-pipe interface 52, one end of which is open, and the heating rod module 20 and the closer module 30 are accommodated in the pump-down-pipe housing 51 through the opening in the assembled state. The suction well tube interface 52 is connected to the end of the suction well tube housing 51 near the opening.
Preferably, the end wall of the extraction pipe housing 51 at the end remote from the opening and the peripheral wall are provided with sieve holes 511.
Preferably, the material of the air extraction well pipe is stainless steel so as to improve the service life.
It should be noted that the closer housing 31, the heating rod housing 21 and the pumping tube housing 51 may be made of 310s stainless steel or other high temperature resistant materials. The material of the power supply shell 11 and the cold end shell 41 can be 316 stainless steel or other temperature-resistant rigid materials.
The embodiment of the present invention further provides an in-situ thermal desorption system, which includes a power supply and the in-situ thermal desorption apparatus 100, wherein the power supply is electrically connected to one end of the first power line 12.
In this embodiment, normal position thermal desorption system still includes temperature-detecting device, and the quantity of normal position thermal desorption device 100 is a plurality of, and a plurality of normal position thermal desorption devices 100 all are used for inserting the underground and be regular polygon and distribute, and temperature-detecting device sets up in regular polygon's central point and puts.
The application one is as follows:
referring to fig. 7, the power module 10 is plugged into the cold side modules 40, and the number of cold side modules 40 may be increased according to the depth of the contaminants, for example, a plurality of cold side modules 40 may be combined to extend the cold side system length. The cold end module 40 is plugged onto the heating rod module 20. The heating rod module 20 is plugged onto the closer module 30. The whole system forms a closed loop through the closer module 30, and the electric heating function is realized. Depending on the contamination depth and extent, the number of heating rod modules 20 may be increased, for example, by combining a plurality of heating rod modules 20 to extend the heating length.
If the depth of the pollutant is 3-6m, 3 cold end modules 40 with the length of 1000mm and 2 heating rod modules 20 with the length of 1500mm are selected, according to the figure 7, the top end is fixedly connected with the power supply module 10 in an inserted mode, and the bottom end is fixedly connected with the closer module 30 in an inserted mode.
Holes with the diameter of 150mm and the depth of 6.5m are drilled at the selected positions, and the modules are connected in sequence, inserted into the drilled holes and fixed. 3 in-situ thermal desorption device 100 combinations are arranged according to an equilateral triangle, a temperature monitoring point is arranged at the center of the triangle, a temperature detection device is arranged at the position, the distance from the monitoring point to the three in-situ thermal desorption devices 100 is 2m, the soil temperature change in the heating process is recorded, and a temperature recording table is shown in table 1.
TABLE 1 temperature monitoring results
As can be seen from table 1, the above manner can effectively heat the soil environment to above the boiling point of the organic pollutants.
The application II comprises the following steps:
referring to fig. 8, the power supply module 10 is plugged to the heating rod module 20. The bottom end of the heating rod module 20 is inserted into the closer module 30, and the closer is used for forming a closed loop of the whole system, so that the electric heating function is realized. The pump-leg module 50 is provided according to the depth and range of contamination, and the heating rod module 20 and the closer module 30 are accommodated in the pump-leg module 50. The combination can increase the number of the heating rod modules 20, for example, a plurality of heating rod modules 20 are combined to prolong the heating length, so as to meet the requirements of extraction wells with different depths.
If the site pollutants are TPH (<16), benzo (α) pyrene and benzene, the pollution depth is 4m, 6 in-situ thermal desorption devices 100 are arranged around a heating extraction well 1.5m, the environment temperature of the soil in the polluted area is increased by electrifying, the target organic pollutants are desorbed into a gas phase, and the gas phase is extracted from the heating extraction well for treatment, wherein the content ratio of the target organic pollutants in the soil before and after treatment is shown in Table 2.
TABLE 2 contaminant content before and after in-situ thermal desorption treatment
| Names of polluting Components | Content before treatment (mg/kg) | Content after treatment (mg/kg) | Removal Rate (%) |
| TPH(<16) | 7690 | 1012 | 86.8％ |
| Benzo (α) pyrene | 8.91 | 0.43 | 95.2％ |
| Benzene and its derivatives | 36.5 | 0.11 | 99.7％ |
As can be seen from table 2, the contaminants were effectively removed by the in situ thermal desorption treatment described above.
In summary, the in-situ thermal desorption apparatus 100 provided in the embodiment of the present invention utilizes the power supply module 10, the cold end module 40, the heating rod module 20 at the top end, and the closer module 30 at the bottom end to realize the connection among the modules in an insertion manner, thereby realizing the modular design of the in-situ thermal desorption heating element and the standardization of the specifications of the modules, and realizing the standardized mass production of the heating element. Moreover, the modular design facilitates transportation, installation, removal and reuse of other sites of the in-situ thermal desorption device 100, improves the reusability of the device, and reduces the purchase and depreciation costs of the device. By adding the pumping well pipe module 50, the temperature drop in the pollutant diffusion process is reduced, the desorption and extraction of pollutants are enhanced, and the repair efficiency is improved. The in-situ thermal desorption system comprising the in-situ thermal desorption device 100 is convenient to use and has strong industrial applicability.
The above description is only for the specific embodiments 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 appended claims.
Claims (10)
1. An in-situ thermal desorption device is characterized by comprising a power supply module, a heating rod module and a closer module;
the power supply module comprises a power supply shell and a first power transmission line, wherein the first power transmission line is arranged in the power supply shell, two ends of the first power transmission line are respectively connected with two ends of the power supply shell, and one end of the first power transmission line is used for being connected with a power supply source;
the heating rod module comprises a heating rod shell and a thermal resistance wire, the thermal resistance wire is arranged in the heating rod shell, and two ends of the thermal resistance wire are respectively connected with two ends of the heating rod shell;
the closer module includes a closer housing and a closing line disposed within the closer housing;
the in-situ thermal desorption device is in an assembly state and a decomposition state: in an assembly state, the heating rod module is assembled between the power supply module and the closer module, and the first power transmission line, the thermal resistance wire and the close line form a loop; the power supply module, the heating rod module and the closer module are separated from each other in a disassembled state.
2. The in-situ thermal desorption device of claim 1, further comprising a cold end module, wherein the cold end module comprises a cold end housing and a second power line, the second power line is disposed in the cold end housing, and two ends of the second power line are respectively connected with two ends of the cold end housing;
in the assembly state, the cold end module is assembled between the power supply module and the heating rod module, and the first power transmission line, the second power transmission line, the thermal resistance wire and the closed line form a loop; in the disassembled state, the power supply module, the cold end module, the heating rod module and the closer module are mutually separated.
3. The in-situ thermal desorption device of claim 2, wherein a cold socket and a cold plug are respectively arranged at two ends of the cold housing, the cold socket and the cold plug are respectively electrically connected with two ends of the second power transmission line, the cold socket is used for being detachably connected with a power supply module, and the cold plug is used for being detachably connected with a heating rod module;
preferably, the cold end shell is made of stainless steel;
preferably, the cold end module is cylindrical, and the height of the cold end module is 500mm-5000 mm; the diameter of the cold end module is 30mm-300 mm;
preferably, the number of the cold end modules is multiple, and two adjacent cold end modules are connected end to end.
4. The in-situ thermal desorption device of claim 1, further comprising an extraction tube module comprising an extraction tube housing;
in the assembled state, the heating rod module and the closer module are accommodated in the air extraction well pipe shell; and in the decomposition state, the power supply module, the heating rod module, the closer module and the air pumping well pipe module are separated from each other.
5. The in-situ thermal desorption device of claim 4 wherein the extraction well pipe module further comprises an extraction well pipe interface, one end of the extraction well pipe being open;
in the assembled state, the heating rod module and the closer module are accommodated in the air pumping well pipe shell through the opening; the air pumping well pipe connector is connected with one end, close to the opening, of the air pumping well pipe shell;
preferably, the end wall and the peripheral wall of one end of the air pumping well pipe shell, which is far away from the opening, are provided with sieve holes;
preferably, the material of the air extraction well pipe is stainless steel;
preferably, the pumping well pipe module is cylindrical, and the height of the pumping well pipe module is 2000mm-30000 mm; the diameter of the pumping well pipe module is 50mm-350 mm.
6. The in-situ thermal desorption device according to any one of claims 1 to 5, wherein one end of the power supply housing is provided with a power supply plug, the power supply plug is electrically connected with the first power line, and the power supply plug is used for detachably connecting the heating rod module;
preferably, the power supply shell is made of stainless steel;
preferably, the power supply module is cylindrical, and the height of the power supply module is 100mm-1000 mm; the diameter of the closer module is 30mm-300 mm;
preferably, the power supply module further comprises a power connector fixed to the power supply housing and electrically connected to one end of the first power line, the power connector being adapted to be connected to a power supply.
7. The in-situ thermal desorption device according to any one of claims 1 to 5, wherein the heating rod housing is provided at two ends thereof with a heating socket and a heating plug, respectively, the heating socket and the heating plug are electrically connected with two ends of the thermal resistance wire, respectively, the heating socket is used for detachably connecting with a power supply module, and the heating plug is used for detachably connecting with a closer module;
preferably, the heating rod module further comprises magnesium oxide powder, and the magnesium oxide powder is filled in the heating rod shell;
preferably, the number of the heating rod modules is multiple, and two adjacent heating rod modules are connected end to end;
preferably, the heating rod module further comprises a stainless steel column fixed in the heating rod housing, and the thermal resistance wire is wound outside the stainless steel column;
preferably, the heating rod module is cylindrical, and the height of the heating rod module is 1000mm-5000 mm; the diameter of the heating rod module is 30mm-300 mm.
8. The in-situ thermal desorption device according to any one of claims 1 to 5, wherein the closer housing is provided with a closing socket, the closing socket is connected with the closing wire, and the closing socket is used for being detachably connected with the heating rod module;
preferably, the closer module is cylindrical, and the height of the closer module is 10mm-200 mm; the diameter of the closer module is 30mm-300 mm;
preferably, the closed wire is a resistance wire.
9. An in-situ thermal desorption system, which comprises a power supply source and the in-situ thermal desorption device as claimed in any one of claims 1 to 8, wherein the power supply source is electrically connected with one end of the first power transmission line.
10. The in-situ thermal desorption system of claim 9, further comprising a plurality of temperature detection devices, wherein the in-situ thermal desorption devices are all inserted underground and distributed in a regular polygon shape, and the temperature detection devices are disposed at the center of the regular polygon shape.
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| CN202010030636.6A CN111229803A (en) | 2020-01-13 | 2020-01-13 | In-situ thermal desorption device and in-situ thermal desorption system |
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| CN202010030636.6A CN111229803A (en) | 2020-01-13 | 2020-01-13 | In-situ thermal desorption device and in-situ thermal desorption system |
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