CN112517621A - Heating pipe for in-situ thermal desorption additional heat device for polluted soil - Google Patents
Heating pipe for in-situ thermal desorption additional heat device for polluted soil Download PDFInfo
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- CN112517621A CN112517621A CN202011292770.XA CN202011292770A CN112517621A CN 112517621 A CN112517621 A CN 112517621A CN 202011292770 A CN202011292770 A CN 202011292770A CN 112517621 A CN112517621 A CN 112517621A
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- pipe
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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
-
- 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 discloses a heating pipe for an in-situ thermal desorption additional heating device for polluted soil, wherein a body of the heating pipe is formed by connecting and combining a plurality of pipe bodies, each pipe body consists of an outer pipe and an inner pipe, the inner pipe is inserted in the outer pipe, a plurality of sleeves are uniformly distributed in a gap on the periphery between the outer wall of the inner pipe and the inner wall of the outer pipe, an industrial heating rod is assembled in each sleeve, a through gas injection hole is formed between the two sleeves and penetrates through the side walls of the inner pipe and the outer pipe, a heating gas can be introduced into an inner cavity of the inner pipe, and the heating gas introduced into the inner cavity of the inner pipe is discharged to the periphery of the heating pipe through the gas injection hole. Has the advantages that: the device can be produced in batches and used repeatedly, the efficiency is improved, and the cost is saved. The power of each heating pipe section can be freely matched according to factors such as the heat conductivity coefficient of the soil layer, the pollutant enrichment condition and the like, and the heating temperature of each section is adjusted. Saving use and maintenance costs.
Description
Technical Field
The invention relates to a heating pipe in a heating device, in particular to a heating pipe in an in-situ thermal desorption additional heating device for polluted soil.
Background
In recent years, with the improvement of environmental awareness, soil pollution remediation and treatment technologies have been vigorously developed. The soil in-situ thermal desorption technology does not need to excavate and transport earthwork, has small disturbance to the surrounding soil environment, thoroughly removes pollutants, and can restore deep soil to be gradually popularized.
The principle of soil in-situ thermal desorption is that volatile or semi-volatile pollutants such as benzene, chlorohydrocarbon, petroleum products and the like in the polluted soil are heated, separated, transported and converted into gas phase or liquid phase in a mode of physically heating the polluted soil, extracted to pollutant treatment equipment and subjected to centralized treatment and discharge. The in-situ thermal desorption technique is widely applied to steam/hot air injection and extraction (SAI) and heat conduction heating (TCH) according to different energy transfer and distribution modes. Steam/hot air injection and extraction (SAI) is characterized in that hot air and steam are injected into a polluted area, and airflow passes through the polluted area to transfer heat to polluted soil on the one hand and take desorbed pollutants away on the other hand, so that the pollutants are finally removed, but the heating temperature is low, and the soil desorption time is long. The heat conduction heating (TCH) can heat the polluted area to hundreds of degrees centigrade, because the heat transfer in the heat conduction technology does not load the heat medium, only the pollutant is naturally separated out, the technology application must be combined with the soil vapor phase extraction, and along with the reduction of moisture in the heated soil, the heat conduction efficiency is reduced. The two heating modes respectively have the application ranges, in order to improve the thermal desorption efficiency more efficiently, make up the defects of the methods, be suitable for desorption of pollutants with different boiling points and cope with increasingly more complex soil formation conditions, usually, heat conduction heating (TCH) and steam/hot air injection and extraction (SAI) are combined, the combination forms an in-situ thermal desorption heating unit of a complex pollution site, a high-temperature heating pollutant migration channel is realized between a heating pipe and an extraction and taking pipe, and the thermal desorption efficiency is improved.
However, the existing heat conduction heating and steam/hot air injection combined heating unit has the following problems during the use process: the heating pipe is difficult to mass production and used repeatedly, only is suitable for a certain place according to the place customization heating pipe length that pollutes, is difficult to carry out heat-conduction and steam/hot air injection simultaneously, can not be according to the heat-conduction heating temperature of soil horizon actual conditions segmentation control each section, the damage of heating pipe part involves whole heating pipe normal operating, the heating pipe of whole heating pipe part of replacement will be maintained in the damage of heating pipe part, at narrow workspace low tube difficulty, need clear up the operation district place on a large scale. Causing resource waste and increasing the pollutant treatment cost and the treatment period.
Disclosure of Invention
The invention aims to solve the problems of the existing combined heating unit of heat conduction heating and steam/hot air injection in the using process and provide a heating pipe for an in-situ thermal desorption additional heating device for contaminated soil.
The heating pipe body used in the in-situ thermal desorption additional heating device for the polluted soil is formed by connecting and combining a plurality of pipe bodies, each pipe body consists of an outer pipe and an inner pipe, wherein the inner pipe is inserted in the outer pipe, a plurality of sleeves are uniformly distributed in a gap on the periphery between the outer wall of the inner pipe and the inner wall of the outer pipe, an industrial heating rod is assembled in each sleeve, a through gas injection hole is formed in the side wall between the two sleeves penetrating through the inner pipe and the outer pipe, heating gas can be introduced into the inner cavity of the inner pipe, and the heating gas introduced into the inner cavity of the inner pipe is discharged to the periphery of the heating pipe through the gas injection hole.
The front end of the heating pipe is connected with an air inlet pipe, the air inlet pipe is communicated with an inner cavity of an inner pipe in each pipe body, heated gas is input into the inner cavity of the inner pipe of each pipe body through the air inlet pipe, the front end of the heating pipe is also connected with a lead, the lead is connected with an industrial heating rod, electric power used by the industrial heating rod is input through the lead, and the tail end of the heating pipe is sealed through plugging.
The socket and the socket are correspondingly provided with screw holes, screws are screwed in the screw holes to fixedly connect the socket and the socket, the socket and the pipe body are connected through the three screws, the socket and the pipe body are also correspondingly provided with alignment stars to accurately position and connect the socket and the pipe body, the socket and the socket are also internally provided with sealing rings, and the sealing rings are made of high-temperature-resistant and corrosion-resistant materials.
The outer pipe and the inner pipe are concentric cylindrical steel pipes, the sleeve is also a steel pipe, and the outer pipe, the inner pipe and the sleeve are all made of high-temperature-resistant and corrosion-resistant steel.
Twelve industrial heating rods are uniformly distributed on the periphery of the inner pipe between the outer wall of the inner pipe and the inner wall of the outer pipe in the sleeve pipe, every four industrial heating rods are connected in parallel to form one group, the twelve industrial heating rods are divided into three groups, the adjacent groups of industrial heating rods are connected in a triangular mode, and the industrial heating rods are made of high-temperature-resistant and corrosion-resistant materials.
The use method and the use principle of the invention are as follows:
1. investigating the size, the pollutant burial depth, the pollutant distribution condition and the soil layer condition of a pollutant treatment site, designing the heating pipe burial depth, the pipe distribution mode and the pipe distribution distance, and drilling the heating pipe at the same time, wherein the depth of the heating pipe is more than 1m of the pollutant burial depth.
2. And designing the length of the heating tube and the heating temperature required by each section according to the investigation result, and selecting a combination mode of tube bodies with different thermal powers.
3. According to the length of the heating pipe, the site construction space and the lifting mechanical equipment, the mode that the pipe body of the heating pipe is completely connected and arranged at one time or the pipe body is connected and arranged at the same time can be selected.
4. Before each pipe body is connected, whether each pipe body is damaged or not is checked, and if the pipe body is damaged, the pipe body is replaced or maintained. The tail pipe and the middle pipe body are connected firstly, the alignment sight of the pipe tail socket and the pipe body socket is aligned, the tail pipe socket alignment sight is inserted into the pipe body socket, four inner hexagonal screws respectively penetrate through screw holes reserved on the periphery of the pipe body socket and the tail pipe socket, the screws are screwed, and screw caps are recessed into the socket. And hoisting the connected tail pipe and the middle pipe body, placing the tail pipe and the middle pipe body in a drill hole, connecting the next pipe body, repeating the steps until a head pipe is installed, and finally plugging the gap between the heating pipe and the drill hole to perform thermal desorption operation.
5. When the thermal desorption operation is completed or the pipe body is replaced in maintenance, the mode that the heating pipe is completely disassembled once or the heating pipe is disassembled while being taken out can be selected, the head pipe is taken out firstly, the screws used for fixing the pipe body and the head pipe joint are screwed out by using the inner hexagonal wrench, the head pipe is taken down, then the lower section pipe body is pulled out, the screws used for fixing the joint between the pipe bodies are screwed out by using the inner hexagonal wrench, and the tail pipe joint is disassembled until the tail pipe joint is disassembled, and each part to be disassembled is placed in a classified mode, so that the transportation and the next use are facilitated.
6. When the pipe body is maintained and replaced, the screw for fixing the damaged pipe body joint is screwed out by the inner hexagonal wrench, the pipe body is taken down, and the whole pipe body is replaced. Also can use the allen key to unscrew the screw that is used for fixed socket and body, take out the industry heating rod that damages, replace, then aim at the sight of socket and body, screw up set screw with the allen key.
The invention has the beneficial effects that:
the heating pipe provided by the invention can combine heat conduction heating and steam/hot air injection modes, reduces the temperature loss of steam/hot air in pipe pass transportation in deep soil heat desorption, is suitable for more complex soil pollutant desorption environment, and can be respectively and independently used in heat conduction heating and steam/hot air injection. Heating tube length can be formed by the body segmentation head and the tail concatenation according to polluting the place size, need not to customize according to a certain pollution place, but batch production, used repeatedly raises the efficiency, practices thrift the cost. The power of each heating pipe section can be freely matched according to factors such as the heat conductivity coefficient of the soil layer, the pollutant enrichment condition and the like, and the heating temperature of each section is adjusted. The heating pipe can be disassembled and transported for placement, and can also be arranged by connecting a long edge at the side of a narrow operation space, so that the suitability of pipe distribution in a complex site is improved. Each pipe body circuit of the heating pipe is connected in parallel, the damage of a certain section of pipe body does not influence the normal operation of other pipe bodies, and each group of industrial heating rods is connected in a triangular mode between the pipe bodies, so that the damaged parts of each pipe section can be conveniently detected. The damaged tube body is convenient to replace, and the industrial heating rod in the tube body can be replaced only, so that the use and maintenance cost is saved.
Drawings
FIG. 1 is a schematic view of an overall assembly structure of the heating pipe of the present invention.
FIG. 2 is a schematic cross-sectional view of a heating tube according to the present invention.
Fig. 3 is a schematic view of a tube body structure in the heating tube of the present invention.
Fig. 4 is a schematic view of the front end structure of the heating pipe of the present invention.
Fig. 5 is a schematic view of the tail end structure of the heating tube according to the present invention.
Fig. 6 is a top view of a tube socket according to the present invention.
FIG. 7 is a top view of the socket of the present invention.
FIG. 8 is a schematic diagram of the connection circuit of the industrial heating rod according to the present invention.
The labels in the above figures are as follows:
1. the tube body 2, the outer tube 3, the inner tube 4, the sleeve 5, the industrial heating rod 6 and the gas injection hole
7. Air inlet pipe 8, lead 9, plug 10, socket 11, socket 12 and male plug pin
13. Jack 14, screw hole 15, screw 16, sight 17, sealing washer.
Detailed Description
Please refer to fig. 1 to 8:
the body of the heating pipe used in the in-situ thermal desorption additional heat device for the polluted soil is formed by connecting and combining a plurality of pipe bodies 1, each pipe body 1 consists of an outer pipe 2 and an inner pipe 3, wherein the inner pipe 3 is inserted in the outer pipe 2, a plurality of sleeves 4 are uniformly distributed in a gap on the periphery between the outer wall of the inner pipe 3 and the inner wall of the outer pipe 2, an industrial heating rod 5 is assembled in each sleeve 4, a through gas injection hole 6 is arranged between the two sleeves 4 and penetrates through the inner pipe 3 and the side wall of the outer pipe 2, the inner cavity of the inner pipe 3 can be filled with heating gas, and the heating gas filled in the inner cavity of the inner pipe 3 is discharged to the periphery of the heating pipe through the gas injection hole 6.
The front end of the heating pipe is connected with an air inlet pipe 7, the air inlet pipe 7 is communicated with the inner cavity of the inner pipe 3 in each pipe body 1, heated air is input into the inner cavity of the inner pipe 3 in each pipe body 1 through the air inlet pipe 7, the front end of the heating pipe is also connected with a lead 8, the lead 8 is connected with an industrial heating rod 5, electric power used by the industrial heating rod 5 is input through the lead 8, and the tail end of the heating pipe is sealed through a plug 9.
The pipe bodies 1 are spliced, the front end of each pipe body 1 is provided with a socket 10, the rear end of each pipe body 1 is provided with a socket 11, three male pins 12 are uniformly distributed in the inner cavity of the socket 11, three jacks 13 are arranged in the positions, corresponding to the three male pins 12 in the socket 11, in the socket 10, the three male pins 12 can be inserted into the three jacks 13 so as to enable the socket 11 to be connected with the socket 10, the three male pins 12 are connected with an industrial heating rod 5 in a sleeve 4, the three jacks 13 are also connected with the industrial heating rod 5 in the sleeve 4, screw holes 14 are correspondingly arranged on the socket 11 and the socket 10, screws 15 are screwed in the screw holes 14 so as to enable the socket 11 to be fixedly connected with the socket 10, the socket 10 is connected with the pipe body 1 through the three screws 15, and alignment stars 16 are correspondingly arranged on the socket 11, the socket 10 and the pipe body 1 so as to enable the socket 11 to be accurately positioned and connected with the pipe body 10, sealing rings 17 are also arranged in the socket 11 and the socket 10, and the sealing rings 17 are made of high-temperature-resistant and corrosion-resistant materials.
The outer pipe 2 and the inner pipe 3 are concentric cylindrical steel pipes, the sleeve 4 is also a steel pipe, and the outer pipe 2, the inner pipe 3 and the sleeve 4 are all made of high-temperature-resistant corrosion-resistant steel.
Twelve industrial heating rods 5 are uniformly distributed on the periphery of the sleeve 4 between the outer wall of the inner pipe 3 and the inner wall of the outer pipe 2, every four industrial heating rods 5 are connected in parallel to form a group, the twelve industrial heating rods 5 are divided into three groups, the adjacent groups of industrial heating rods 5 are connected in a triangular mode, and the industrial heating rods 5 are made of high-temperature-resistant and corrosion-resistant materials.
The use method and the use principle of the invention are as follows:
1. investigating the size, the pollutant burial depth, the pollutant distribution condition and the soil layer condition of a pollutant treatment site, designing the heating pipe burial depth, the pipe distribution mode and the pipe distribution distance, and drilling the heating pipe at the same time, wherein the depth of the heating pipe is more than 1m of the pollutant burial depth.
2. And designing the length of the heating tube and the heating temperature required by each section according to the investigation result, and selecting the combination mode of the tube bodies 1 with different thermal powers.
3. According to the length of the heating pipe, the site construction space and the lifting mechanical equipment, the mode that the pipe body 1 of the heating pipe is connected for one time or the pipe body 1 is connected and arranged at the side can be selected.
4. Before the pipe bodies 1 are connected, whether the pipe bodies 1 are damaged or not is checked, and if the pipe bodies 1 are damaged, the pipe bodies are replaced or maintained. Firstly, a tail pipe and a middle pipe body 1 are connected, a sight 16 aligning a pipe tail socket 10 and a pipe body 1 bell mouth 11 is aligned, the tail pipe socket 10 is inserted into the pipe body 1 bell mouth 11, four inner hexagon screws respectively penetrate through screw holes 14 reserved on the periphery of the pipe body 1 bell mouth 11 and the tail pipe socket 10, screws 15 are screwed, and screw caps are recessed into the bell mouth 11. And hoisting the connected tail pipe and the middle pipe body 1, placing the tail pipe and the middle pipe body in a drill hole, connecting the next pipe body 1, repeating the process until a head pipe is installed, and finally plugging the gap between the heating pipe and the drill hole to perform thermal desorption operation.
5. When thermal desorption operation is accomplished or body 1 is changed in the maintenance, the mode that the heating pipe was all taken out once and is disassembled or the heating pipe was disassembled while taking out can be selected, the head pipe is taken out earlier, screw 15 that will be used for fixed body 1 and head coupling is twisted out with interior hexagonal spanner, take off the head pipe, then pull out hypomere body 1, screw 15 that will be used for fixed body 1 inter-piecing is twisted out with interior hexagonal spanner, until disassembling the tail pipe and connecting, put things in good order each part classification of disassembling, convenient transportation and next use.
6. When the pipe body 1 is repaired and replaced, the screw 15 for fixing the joint of the damaged pipe body 1 is screwed out by using the hexagon socket wrench, the pipe body 1 is taken down, and the whole pipe body 1 is replaced. The screws 15 for fixing the socket 10 with the tube body 1 can also be unscrewed with an allen key, the damaged industrial heating rod 5 is extracted and replaced, and then the socket 10 and the sight 16 of the tube body 1 are aligned and the fixing screws 15 are tightened with an allen key.
Claims (5)
1. A heating pipe for in situ thermal desorption additional heat device of contaminated soil is characterized in that: the body of heating pipe is formed by several sections body coupling combinations, every section body all comprises outer tube and inner tube, wherein the inner tube is inserted and is established in the outer tube, the equipartition has the several sleeve pipe in the clearance of border between the outer wall of inner tube and the inner wall of outer tube, all be equipped with the industrial heating stick in every sleeve pipe, the lateral wall that passes inner tube and outer tube between two sleeve pipes is provided with penetrating gas injection hole, the inner chamber of inner tube can let in heating gas, the heating gas who lets in the inner chamber of inner tube passes through the gas injection hole and discharges to the border of heating pipe.
2. The heating pipe for the in-situ thermal desorption additional heating device of the polluted soil as claimed in claim 1, is characterized in that: the front end of the heating pipe is connected with an air inlet pipe, the air inlet pipe is communicated with an inner cavity of an inner pipe in each pipe body, heating gas is input into the inner cavity of the inner pipe of each pipe body through the air inlet pipe, the front end of the heating pipe is also connected with a lead, the lead is connected with an industrial heating rod, electric power used by the industrial heating rod is input through the lead, and the tail end of the heating pipe is sealed through plugging.
3. The heating pipe for the in-situ thermal desorption additional heating device of the polluted soil as claimed in claim 1, is characterized in that: the socket comprises pipe bodies, wherein the pipe bodies are connected in an inserting mode, the front end of each pipe body is a socket, the rear end of each pipe body is a socket, three male contact pins are uniformly distributed in an inner cavity of the socket, three inserting holes are formed in positions, corresponding to the three male contact pins in the socket, of the socket, the three male contact pins can be inserted into the three inserting holes to enable the socket to be connected with the socket, the three male contact pins are connected with an industrial heating rod in the sleeve, the three inserting holes are also connected with the industrial heating rod in the sleeve, screw holes are correspondingly formed in the socket and the socket, screws are connected in the screw holes to enable the socket to be fixedly connected with the socket, the socket and the pipe body are connected through the three screws, collimation stars are correspondingly arranged on the socket, the socket and the pipe body to enable the socket to be accurately positioned and connected with the pipe body, sealing rings are further arranged in the socket and the socket.
4. The heating pipe for the in-situ thermal desorption additional heating device of the polluted soil as claimed in claim 1, is characterized in that: the outer pipe and the inner pipe are concentric cylindrical steel pipes, the sleeve is also a steel pipe, and the outer pipe, the inner pipe and the sleeve are all made of high-temperature-resistant and corrosion-resistant steel.
5. The heating pipe for the in-situ thermal desorption additional heating device of the polluted soil as claimed in claim 1, is characterized in that: twelve industrial heating rods are uniformly distributed on the periphery of the inner pipe between the outer wall of the inner pipe and the inner wall of the outer pipe in the sleeve pipe, every four industrial heating rods are connected in parallel to form one group, the twelve industrial heating rods are divided into three groups, the adjacent groups of industrial heating rods are connected in a triangular mode, and the industrial heating rods are made of high-temperature-resistant and corrosion-resistant materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011292770.XA CN112517621A (en) | 2020-11-18 | 2020-11-18 | Heating pipe for in-situ thermal desorption additional heat device for polluted soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011292770.XA CN112517621A (en) | 2020-11-18 | 2020-11-18 | Heating pipe for in-situ thermal desorption additional heat device for polluted soil |
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| Publication Number | Publication Date |
|---|---|
| CN112517621A true CN112517621A (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011292770.XA Pending CN112517621A (en) | 2020-11-18 | 2020-11-18 | Heating pipe for in-situ thermal desorption additional heat device for polluted soil |
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| CN (1) | CN112517621A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113798314A (en) * | 2021-09-30 | 2021-12-17 | 上海市政工程设计研究总院（集团）有限公司 | Control method of segmented electric heating in-situ thermal desorption remediation system for contaminated site |
| US11858017B2 (en) * | 2022-01-06 | 2024-01-02 | Institute Of Rock And Soil Mechanics, Cas | In-situ vapor injection thermal desorption device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11858017B2 (en) * | 2022-01-06 | 2024-01-02 | Institute Of Rock And Soil Mechanics, Cas | In-situ vapor injection thermal desorption device |
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