CN111250523A - Gas thermal desorption heating well with longitudinal soil heated uniformly - Google Patents
Gas thermal desorption heating well with longitudinal soil heated uniformly Download PDFInfo
- Publication number
- CN111250523A CN111250523A CN202010042069.6A CN202010042069A CN111250523A CN 111250523 A CN111250523 A CN 111250523A CN 202010042069 A CN202010042069 A CN 202010042069A CN 111250523 A CN111250523 A CN 111250523A
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- heat exchange
- thermal desorption
- pipe
- gas
- soil
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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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a gas thermal desorption heating well with uniformly heated longitudinal soil, which comprises a heat exchange wall shell, wherein a main pipe is arranged in the heat exchange wall shell, an auxiliary pipe is sleeved outside the main pipe, and a spiral guide plate is arranged between the outer wall of the auxiliary pipe and the inner wall of the heat exchange wall shell; the wall of the auxiliary pipe is provided with a hole, the lower opening of the auxiliary pipe is sealed, and the main pipe is of a structure which is through up and down. Through the spiral guide plate of installation on the auxiliary tube, make palirrhea high temperature flue gas accelerate at shallow soil region intermediate flow rate, heat transfer wall surface heat transfer coefficient increases, and the following current high temperature gas accessible hole is outside heat transfer to auxiliary tube, is favorable to the stability of gas temperature, and the effectual repair efficiency and the energy efficiency that improve the gas thermal desorption technique make the regional soil longitudinal direction of target go up being heated more even, have solved the problem that shallow soil can not reach the target temperature.
Description
Technical Field
The invention relates to a soil in-situ thermal remediation technology, in particular to a gas thermal desorption heating well with longitudinal soil uniformly heated.
Background
The gas thermal desorption repair (GTR) technology uses clean fuel such as natural gas or petroleum gas as heating energy, and high temperature flue gas generated by combustion as a heat source. The GTR technology is considered to be one of the technologies with higher comprehensive performance price in the soil remediation technology by virtue of the advantages of wide pollutant treatment range, use of clean energy for combustion, short remediation period, large heating depth and the like.
As a key component in GTR technology, gas-fired heating units are usually composed of a burner and a heating pipe. The traditional heating pipe consists of an outer guide pipe and an inner guide pipe, and high-temperature flue gas is firstly transmitted to the deep part of a target treatment site through the inner guide pipe and then flows back to the ground through the outer guide pipe. Because the outer conduit is in direct contact with the soil, the high temperature flue gas transfers heat to the surrounding soil through a heat conduction effect. However, when the heating depth is large, the heating temperature at the bottom of the traditional heating pipe is high, the energy output of shallow soil is low, and the target temperature is difficult to reach, so that the phenomenon of uneven longitudinal heating of soil is easily caused. In the process of gas thermal desorption repair, if the soil is heated unevenly longitudinally, pollutants are cooled in the extraction pipe, and the extraction pipe is blocked; the monitoring well collapses, which causes serious consequences such as settlement of a repair site.
At present, most of heating pipe equipment of a gas thermal desorption repair technology adopts a traditional heating pipe form, so that the repair efficiency is low, the energy utilization is insufficient, and the phenomenon of uniform longitudinal soil heating is easy to occur.
Disclosure of Invention
The invention aims to provide a gas thermal desorption heating well with longitudinal soil uniformly heated.
The purpose of the invention is realized by the following technical scheme:
the gas thermal desorption heating well with uniformly heated longitudinal soil comprises a heat exchange wall shell, wherein a main pipe is arranged in the heat exchange wall shell, an auxiliary pipe is sleeved outside the main pipe, and a spiral guide plate is arranged between the outer wall of the auxiliary pipe and the inner wall of the heat exchange wall shell;
the wall of the auxiliary pipe is provided with a hole, the lower opening of the auxiliary pipe is sealed, and the main pipe is of a structure which is through up and down.
According to the technical scheme provided by the invention, the gas thermal desorption heating well with uniformly heated longitudinal soil provided by the embodiment of the invention has the advantages that the spiral guide plate arranged on the auxiliary pipe accelerates the flow speed of the reverse-flow high-temperature flue gas in a shallow soil area, the heat exchange coefficient of the surface of the heat exchange wall is increased, the heat of the reverse-flow high-temperature flue gas can be transferred to the outside of the auxiliary pipe through the holes, the stability of the temperature of the flue gas is facilitated, the restoration efficiency and the energy utilization efficiency of a gas thermal desorption technology are effectively improved, the heating of the target area soil in the longitudinal direction is more uniform, and the problem that the shallow soil cannot reach the target temperature is solved.
Drawings
Fig. 1a, 1b, and 1c are schematic side, cross-sectional, and cross-sectional structural views of a gas thermal desorption heating well with longitudinal soil heated uniformly according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a part of the structure of the embodiment of the present 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 relates to a gas thermal desorption heating well with longitudinal soil uniformly heated, which has the preferred specific implementation mode that:
the heat exchange wall comprises a heat exchange wall shell, wherein a main pipe is arranged in the heat exchange wall shell, an auxiliary pipe is sleeved outside the main pipe, and a spiral guide plate is arranged between the outer wall of the auxiliary pipe and the inner wall of the heat exchange wall shell;
the wall of the auxiliary pipe is provided with a hole, the lower opening of the auxiliary pipe is sealed, and the main pipe is of a structure which is through up and down.
The main tube is nested in the auxiliary tube in a concentric cylinder manner.
The main pipe is flush with the uppermost portion of the auxiliary pipe.
The length of the auxiliary pipe is not more than that of the main pipe.
The screw pitch of the spiral guide plate is gradually reduced from bottom to top.
The holes are positioned between the spiral guide plates.
The arrangement density of the holes is gradually increased from bottom to top.
The heat exchange wall shell is a hollow cylinder with a closed lower part, and is in direct contact with soil during actual operation.
The inner diameter of the heat exchange wall shell is just enough to ensure that no gap exists between the heat exchange wall shell and the spiral guide plate.
The invention relates to a gas thermal desorption heating well with longitudinal soil uniformly heated, which is a heating pipe with a special structure. On one hand, the backflow high-temperature gas flows upwards through a spiral guide plate which is arranged on the wall of the auxiliary pipe and the screw pitch of which is gradually reduced from bottom to top; the dense spiral at the shallow soil increases the flow velocity of the reverse high-temperature gas, and the surface heat exchange coefficient of the heat exchange wall is increased. On the other hand, a plurality of holes with gradually increasing arrangement density from bottom to top are arranged on the inner wall of the auxiliary pipe; the forward flow high-temperature gas brings heat to the outside of the auxiliary pipe wall through the hole part and is mixed with the reverse flow high-temperature gas to adjust the temperature of the flue gas, and the phenomenon that the soil is heated unevenly due to overhigh temperature at the bottom of the heating pipe but low superficial temperature is avoided.
The specific embodiment is as follows:
as shown in fig. 1a, 1b, 1c, and 2, an embodiment of the present invention provides a heating pipe with a special structure, which includes a main pipe 3, an auxiliary pipe 4, a spiral deflector 2, holes 5, and a heat exchange wall housing 1, wherein the main pipe 3 is nested in the auxiliary pipe 4 in a concentric cylinder manner, the spiral deflector 2 is installed outside the auxiliary pipe 4, and the holes 5 are located outside the auxiliary pipe 4; the heat exchange wall shell 1 is a hollow cylinder with a closed lower part, and the heat exchange wall shell 1 is in direct contact with soil during actual operation.
In the heating pipe with a special structure provided by the embodiment, the downward flow path of the flue gas is divided into two parts by the auxiliary pipe 4 and the main pipe 3. One part of the flue gas flows downwards in the main pipe 3 and flows upwards through a flue gas passage formed by the heat exchange wall shell 1 and the spiral guide plate 2 after reaching the bottom of the heating pipe. The other part flows downwards in the auxiliary pipe 4, and is shunted once through one hole 5 until the hole 5 at the bottom of the auxiliary pipe 4 completely flows into a flue gas passage formed by the auxiliary pipe 4 and the spiral guide plate 2, and each shunting brings part of heat out of the auxiliary pipe and mixes with the backflow high-temperature flue gas.
In the field, the high-temperature flue gas flowing downwards (inside the main pipe and the auxiliary pipe) is the downstream high-temperature flue gas, and the high-temperature flue gas flowing upwards (flue gas passage formed by the main pipe and the heat exchange wall shell, and the spiral guide plate installed on the auxiliary pipe and the heat exchange wall shell) is the upstream high-temperature flue gas.
As shown in fig. 1a, fig. 1b, fig. 1c, and fig. 2, the spiral guide plate 2 is directly installed on the auxiliary pipe 4, and the spiral pitch is reduced from top to bottom, and the inner diameter of the heat exchange wall housing 1 is just large enough to make no gap between the heat exchange wall housing 1 and the spiral guide plate 2, so that it can be understood that the reverse flow high temperature flue gas only flows through two flue gas passages formed by the heat exchange wall housing 1 and the spiral guide plate 2, and the heat exchange wall housing 1 and the main pipe 3. Through the dense spiral guide plate 2 in the shallow layer area, the flow velocity of the high-temperature backflow flue gas is accelerated, and the heat exchange coefficient of the surface of the heat exchange wall is increased.
The holes 5, which are cut directly in the auxiliary well 4, are located between the spiral deflectors, i.e. the holes 5 should not be cut directly at the location where the spiral deflectors are mounted. Through the holes 5, the concurrent high-temperature flue gas in the auxiliary well 4 transfers heat to a flue gas passage formed by the auxiliary well 4 and the spiral guide plate 2.
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 (9)
1. A gas thermal desorption heating well with uniformly heated longitudinal soil is characterized by comprising a heat exchange wall shell, wherein a main pipe is arranged in the heat exchange wall shell, an auxiliary pipe is sleeved outside the main pipe, and a spiral guide plate is arranged between the outer wall of the auxiliary pipe and the inner wall of the heat exchange wall shell;
the wall of the auxiliary pipe is provided with a hole, the lower opening of the auxiliary pipe is sealed, and the main pipe is of a structure which is through up and down.
2. The gas fired thermal desorption heater well of claim 1 wherein the main tube is nested within the auxiliary tube in concentric cylinders.
3. The longitudinal, soil-heated, gas fired thermal desorption heater well of claim 2 wherein the main pipe is flush with the uppermost portion of the auxiliary pipe.
4. The gas fired thermal desorption heater well of claim 3 wherein the length of the auxiliary pipe is no greater than the length of the main pipe.
5. The gas thermal desorption heating well with the longitudinal soil uniformly heated according to claim 4, wherein the screw pitch of the spiral guide plate is gradually reduced from bottom to top.
6. The gas thermal desorption heater well of claim 5, wherein the holes are located between the spiral baffles.
7. The gas thermal desorption heating well with the longitudinal soil uniformly heated according to claim 6, wherein the arrangement density of the holes is gradually increased from bottom to top.
8. The gas thermal desorption heating well with the longitudinal soil uniformly heated according to claim 7, wherein the heat exchange wall shell is a hollow cylinder with a closed lower part, and the heat exchange wall shell is in direct contact with the soil in actual operation.
9. The gas fired thermal desorption heater well of claim 8 wherein the heat exchange wall housing inner diameter is sized to be just such that there is no gap between the heat exchange wall housing and the spiral deflector.
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| CN202010042069.6A CN111250523B (en) | 2020-01-15 | 2020-01-15 | Gas thermal desorption heating well with longitudinal soil heated uniformly |
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| CN202010042069.6A CN111250523B (en) | 2020-01-15 | 2020-01-15 | Gas thermal desorption heating well with longitudinal soil heated uniformly |
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| CN111250523A true CN111250523A (en) | 2020-06-09 |
| CN111250523B CN111250523B (en) | 2021-08-20 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111672894A (en) * | 2020-06-24 | 2020-09-18 | 宝航环境修复有限公司 | Be applied to prosthetic heat accumulation pulsed heating device of soil thermal desorption |
| CN111790745A (en) * | 2020-07-15 | 2020-10-20 | 北京高能时代环境技术股份有限公司 | In-situ thermal desorption remediation device and method for organic contaminated soil |
| CN112517623A (en) * | 2020-11-18 | 2021-03-19 | 重庆市生态环境科学研究院 | Organic contaminated soil prosthetic devices of normal position gas thermal desorption |
| CN112642846A (en) * | 2020-12-01 | 2021-04-13 | 中建八局环保科技有限公司 | Heating well structure for in-situ gas thermal desorption technology |
| CN112974501A (en) * | 2021-03-18 | 2021-06-18 | 中科鼎实环境工程有限公司 | Energy optimization-based gas thermal desorption energy-saving structure and use method thereof |
| CN116060428A (en) * | 2023-02-20 | 2023-05-05 | 北京建工环境修复股份有限公司 | In-situ gas thermal desorption system for organic contaminated soil |
| CN116460124A (en) * | 2023-05-09 | 2023-07-21 | 北京建工环境修复股份有限公司 | Heating system for in-situ gas thermal remediation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111672894A (en) * | 2020-06-24 | 2020-09-18 | 宝航环境修复有限公司 | Be applied to prosthetic heat accumulation pulsed heating device of soil thermal desorption |
| CN111790745A (en) * | 2020-07-15 | 2020-10-20 | 北京高能时代环境技术股份有限公司 | In-situ thermal desorption remediation device and method for organic contaminated soil |
| CN112517623A (en) * | 2020-11-18 | 2021-03-19 | 重庆市生态环境科学研究院 | Organic contaminated soil prosthetic devices of normal position gas thermal desorption |
| CN112642846A (en) * | 2020-12-01 | 2021-04-13 | 中建八局环保科技有限公司 | Heating well structure for in-situ gas thermal desorption technology |
| CN112974501A (en) * | 2021-03-18 | 2021-06-18 | 中科鼎实环境工程有限公司 | Energy optimization-based gas thermal desorption energy-saving structure and use method thereof |
| CN116060428A (en) * | 2023-02-20 | 2023-05-05 | 北京建工环境修复股份有限公司 | In-situ gas thermal desorption system for organic contaminated soil |
| CN116060428B (en) * | 2023-02-20 | 2024-03-12 | 北京建工环境修复股份有限公司 | In-situ gas thermal desorption system for organic contaminated soil |
| CN116460124A (en) * | 2023-05-09 | 2023-07-21 | 北京建工环境修复股份有限公司 | Heating system for in-situ gas thermal remediation |
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