CN214263209U - Soil normal position thermal desorption repair system - Google Patents
Soil normal position thermal desorption repair system Download PDFInfo
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- CN214263209U CN214263209U CN202023160947.9U CN202023160947U CN214263209U CN 214263209 U CN214263209 U CN 214263209U CN 202023160947 U CN202023160947 U CN 202023160947U CN 214263209 U CN214263209 U CN 214263209U
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Abstract
The utility model provides a soil in-situ thermal desorption repair system, which comprises a plurality of heating wells which are arranged in a regular polygon shape and used for heating the soil in the area to be repaired; the heat recovery wells are positioned in the centers of the heating wells and are used for recovering heat of the heating medium discharged by the heating wells to exchange heat with soil, and heating medium outlets of the heating wells are communicated with heating medium recovery ports of the heat recovery wells through pipelines; and the extraction well is distributed in an area surrounded by the plurality of heating wells and is used for extracting harmful gases volatilized from the heated soil. Through set up the heat recovery well at a plurality of heater well centers, realized the reuse after the high temperature flue gas is retrieved, improved thermal effective utilization and rateed, and made contaminated soil and heater well carry out the heat exchange better, eliminate the cold spot influence, make the repair effect more even.
Description
Technical Field
The utility model relates to a soil thermal desorption technical field particularly, relates to a soil normal position thermal desorption repair system.
Background
The in situ thermal desorption technique is a 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.
At present, the thermal desorption technology of soil in Europe and America is widely applied to ex-situ or in-situ remediation of organic contaminated soil, but the problems of overhigh related treatment cost and the like caused by low heat utilization rate are not well solved, and the application of the thermal desorption technology in the persistent organic contaminated soil remediation is limited.
The common in-situ thermal desorption technology in China is that high-temperature flue gas is generated through combustion of fuel gas, the temperature of the high-temperature flue gas is generally not less than 600 ℃, the high-temperature flue gas flows through a heating well buried in soil to exchange heat with soil around a pipeline, the soil is further heated, the flue gas after heat exchange is directly introduced into a condensing system to be cooled and then is directly discharged, however, the high-temperature flue gas still has higher temperature after heat exchange with the surrounding soil through a heating well, the temperature is about 300 ℃, if the high-temperature flue gas is directly discharged, the problems of overheating of a smoke exhaust pipeline, damage of a smoke exhaust fan and the like are caused on one hand.
Therefore, it is highly desirable to develop a soil remediation system to improve heat utilization.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a soil normal position thermal desorption repair system for solve the problem that present soil repair system thermal efficiency is low.
In order to achieve the above object, the utility model provides a soil normal position thermal desorption repair system, include:
the heating wells are arranged in a regular polygon shape and used for heating the soil in the area to be repaired;
the heat recovery wells are positioned in the centers of the heating wells and are used for recovering heat of the heating medium discharged by the heating wells to exchange heat with soil, and heating medium outlets of the heating wells are communicated with heating medium recovery ports of the heat recovery wells through pipelines;
and the extraction well is distributed in an area surrounded by the plurality of heating wells and is used for extracting harmful gases volatilized from the heated soil.
Preferably, in the soil in-situ thermal desorption remediation system, the heater well comprises:
a burner for supplying a heating medium to the heating well;
the heating well body is pre-buried in soil, has heating inner tube and heating outer tube, and the nestification of heating inner tube is in the heating outer tube, and the top of heating inner tube is connected with the combustor, and the bottom of heating inner tube is linked together with the inlayer space of heating outer tube, and the heating medium export has been seted up on the upper portion of heating outer tube, and heating medium carries out the heat exchange through heating inner tube diffusion to heating outer tube in with soil on every side to via the heating medium export discharge heating well.
Preferably, in the soil normal position thermal desorption repair system, the heat recovery well is pre-buried in soil, including retrieving inner tube and retrieving the outer tube, retrieve the inner tube nestification in retrieving the outer tube, the top of retrieving the inner tube is equipped with heating medium and retrieves the mouth, the heating medium export of seting up on the heating outer tube is connected through the pipeline to the heating medium of heating medium recovery mouth, the bottom of retrieving the inner tube is linked together with the inlayer space of retrieving the outer tube, the heating medium discharge port has been seted up on the upper portion of retrieving the outer tube, retrieve the built-in condensation recovery pipe of inner tube, the entry end of condensation recovery pipe is between retrieving the inner tube bottom and retrieving the outer tube bottom.
Preferably, in the soil in-situ thermal desorption remediation system, the side wall of the lower part of the recovery inner pipe is provided with a sieve pore.
Preferably, in the soil in-situ thermal desorption remediation system, a heat insulation layer is arranged outside the condensation recovery pipe.
Preferably, in the soil in-situ thermal desorption remediation system, the outlet end of the condensation recovery pipe is connected with an extraction pump through a pipeline.
Preferably, in the soil in-situ thermal desorption remediation system, the heating medium discharge port of the recovery outer pipe is connected with a smoke exhaust fan and a smoke exhaust system through a pipeline.
Preferably, in the soil in-situ thermal desorption remediation system, the extraction well is connected with an extraction fan and a waste gas and liquid treatment system through a pipeline.
Preferably, in the soil in-situ thermal desorption remediation system, the heating medium is high-temperature flue gas, and the temperature of the high-temperature flue gas is not less than 600 ℃.
The utility model provides a soil normal position thermal desorption repair system, in view of the heating well exhaust heating medium temperature is higher, is higher than the boiling point of pollutant in the soil usually to soil remediation regional central temperature is lower than other regions on the lower side, for this, the utility model discloses a arrange a heat recovery well at the center of a plurality of heating wells for carry out secondary recycle to heating well exhaust heating medium, can not only make remediation regional central temperature rise, improve the homogeneity of soil remediation regional heating, and then promote thermal desorption efficiency, can also effectively promote repair system's thermal efficiency.
Drawings
Fig. 1 shows a distribution diagram of the soil in-situ thermal desorption remediation system of the utility model;
fig. 2 shows a schematic diagram of the soil in-situ thermal desorption remediation system of the present invention;
figure 3 shows a schematic view of a heat recovery well according to the present invention.
Component numbering
The heating device comprises a heating well 1, a burner 11, a heating well body 12, a heating inner pipe 121, a heating outer pipe 122 and a heating medium outlet 123;
a heat recovery well 2, a recovery inner pipe 21, a heating medium recovery port 211, a condensation recovery pipe 212, a sieve hole 213, a recovery outer pipe 22, and a heating medium discharge port 221;
an extraction well 3.
Detailed Description
In the soil in-situ thermal desorption repairing process, the arrangement mode of the heating wells is usually regular triangle or regular hexagon arrangement, the side length of the regular triangle or regular hexagon is determined according to the heating influence radius, and regardless of the arrangement mode, the positive center of the heating wells is the intersection point influencing the radius, and the intersection point is also the lowest temperature point of the repairing area and is called as a cold point. The temperature of the heating medium discharged from the heating well is higher than the boiling point of pollutants in soil, the heat is not fully utilized, and the direct discharge not only increases the operation load of the flue gas discharge system, but also reduces the thermal efficiency of the repair system.
In view of the problem that above-mentioned soil normal position thermal desorption repair system exists, the utility model provides a soil normal position thermal desorption repair system, see fig. 1 and fig. 2, including a plurality of heating wells 1, be regular polygon and arrange for the soil in the heating area of waiting to restore, in this embodiment, heating well 1 is six, be regular hexagon and arrange, of course in other embodiments, heating well 1 number still can be three, nine, twelve, specific quantity can be confirmed according to the regional area of actual restoration and parameters such as soil pollutant content; the heat recovery well 2 is positioned in the center of the plurality of heating wells 1 and is used for recovering heat of the heating medium discharged from the heating wells 1 to exchange heat with soil, and the heating medium outlets 123 of the plurality of heating wells 1 are communicated with the heating medium recovery ports 211 of the heat recovery well 2 through pipelines; and the at least one extraction well 3 is distributed in the area surrounded by the plurality of heating wells 1 and is used for extracting harmful gas volatilized from the heated soil. In this embodiment, through the cold spot position in soil remediation region, that is to say, add in the center of a plurality of heater wells 1 and establish heat recovery well 2, make the high temperature heating medium of peripheral heater well 1 exhaust concentrate through heat recovery well 2, when reaching heat recovery and utilizing, make the regional temperature of this cold spot rise, promote thermal desorption efficiency.
The heating well 1 includes a burner 11 and a heating well body 12. The burner 11 is used to supply a heating medium, typically high temperature flue gas, typically at 600 ℃, to the heating well 12. In the present embodiment, the combustion gas may be H2And O2The water vapor is formed by combustion of the combustor 11, and a large amount of heat is released to form high-temperature flue gas, and the temperature of the high-temperature flue gas is usually not lower than 600 ℃.
The heating well body 12 is embedded in soil and is provided with a heating inner tube 121 and a heating outer tube 122, the heating inner tube 121 is embedded in the heating outer tube 122, the top of the heating inner tube 121 is connected with the burner 11, the bottom of the heating inner tube 121 is communicated with the inner space of the heating outer tube 122, a heating medium outlet 123 is formed in the upper portion of the heating outer tube 122, and the heating medium is diffused into the heating outer tube 122 through the heating inner tube 121 to exchange heat with surrounding soil and is discharged out of the heating well 1 through the heating medium outlet 123.
Referring to fig. 3, heat recovery well 2 is pre-buried in soil, including retrieving inner tube 21 and retrieving outer tube 22, retrieve inner tube 21 nestification in retrieving outer tube 22, the top of retrieving inner tube 21 is equipped with heating medium and retrieves mouth 211, the bottom of retrieving inner tube 21 is linked together with the inlayer space of retrieving outer tube 22, heating medium discharge port 221 has been seted up on the upper portion of retrieving outer tube 22, retrieve the built-in condensation recovery pipe 212 of inner tube 21, the entry end of condensation recovery pipe 212 is between retrieving inner tube 21 bottom and retrieving outer tube 22 bottom.
The sieve hole 213 has been seted up on the lower part lateral wall of retrieving inner tube 21, sieve hole 213 is used for preventing heating medium, form the liquid seal in retrieving inner tube 21 bottom when condensate water is too much in the high temperature flue gas, cause the flue gas can not get into the recovery outer tube 22 smoothly through the bottom interval of retrieving inner tube 21 and retrieving outer tube 22, arouse that heat exchange is untimely and heat recovery well 2 internal pressure risees, make flue gas and comdenstion water simultaneously get into the exhaust pipe through the heating medium discharge port 221 who retrieves outer tube 22, cause the pipeline to appear ponding scheduling problem.
The outside of the condensate recovery pipe 212 is provided with a heat insulating layer. The heat insulation layer can prevent the condensation recovery pipe 212 from exchanging heat with the heating medium in the recovery outer pipe 22, so that the condensation effect can be improved on one hand, and the utilization rate of the heating medium can be further improved on the other hand.
Referring again to fig. 2, the outlet end of condensate recovery line 212 is piped to an extraction pump. The heating medium discharge port 221 of the recovery outer pipe 22 is connected with a smoke exhaust fan and a smoke exhaust system through pipelines. The extraction well 3 is connected with an extraction fan and a waste gas and liquid treatment system through pipelines.
The utility model discloses soil normal position thermal desorption repair system operation step:
(1) and a heating well 1, a heat recovery well 2 and an extraction well 3 are installed. The gas is burnt by the burner 11 to generate a large amount of flue gas, and the flue gas passes through the heating well 1 to increase the temperature of the soil in the range of the influence radius of the flue gas to be close to or reach the boiling point of soil pollutants.
(2) The heating well 1 exhaust flue gas temperature is higher, generally all is higher than the boiling point of pollutant, therefore the heating well 1 exhaust high temperature flue gas carries out the secondary through heat recovery well 2 and retrieves, makes the regional temperature of cold junction rise simultaneously, makes the regional whole temperature of soil restoration unanimous, and the flue gas after the heat recovery discharges behind smoke exhaust fan.
(3) Soil is heated through the heating well 1, and the pollutant in soil volatilizees and separates out, extracts out through extracting well 3 the pollutant in with soil fast, carries out the condensation after extracting the fan and taking out, gets into waste gas waste liquid processing system and carries out subsequent processing.
Claims (7)
1. The in-situ thermal desorption soil remediation system is characterized by comprising:
the heating wells are arranged in a regular polygon shape and used for heating the soil in the area to be repaired;
the heat recovery wells are positioned in the centers of the heating wells and are used for recovering heat of the heating medium discharged by the heating wells to exchange heat with soil, and heating medium outlets of the heating wells are communicated with heating medium recovery ports of the heat recovery wells through pipelines;
the extraction wells are distributed in the area surrounded by the heating wells and are used for extracting harmful gases volatilized from the heated soil;
the heater well includes:
a burner for supplying a heating medium to the heating well;
the heating well body is pre-embedded in soil and is provided with a heating inner tube and a heating outer tube, the heating inner tube is nested in the heating outer tube, the top of the heating inner tube is connected with a burner, the bottom of the heating inner tube is communicated with the inner space of the heating outer tube, the upper part of the heating outer tube is provided with a heating medium outlet, a heating medium is diffused into the heating outer tube through the heating inner tube to exchange heat with surrounding soil, and the heating medium is discharged out of the heating well through the heating medium outlet;
the heat recovery well is pre-buried in soil, including retrieving the inner tube and retrieving the outer tube, retrieve the inner tube nestification in retrieving the outer tube, the top of retrieving the inner tube is equipped with heating medium and retrieves the mouth, heating medium retrieves the mouth and passes through the heating medium export of seting up on the pipe connection heating outer tube, the bottom of retrieving the inner tube is linked together with the inlayer space of retrieving the outer tube, the heating medium discharge port has been seted up on the upper portion of retrieving the outer tube, retrieve the built-in condensation recovery pipe of inner tube, the entry end of condensation recovery pipe is between retrieving the inner tube bottom and retrieving the outer tube bottom.
2. The in-situ soil thermal desorption remediation system of claim 1, wherein the lower side wall of the inner recovery pipe is provided with a sieve hole.
3. The in-situ soil thermal desorption remediation system of claim 1, wherein the condensation recovery pipe is externally provided with a thermal insulation layer.
4. The in-situ soil thermal desorption remediation system of claim 1, wherein the outlet end of the condensate recovery pipe is connected to an extraction pump via a pipeline.
5. The in-situ soil thermal desorption remediation system of claim 1, wherein the heating medium discharge port of the outer recovery pipe is connected with a smoke exhaust fan and a smoke exhaust system through a pipeline.
6. The in-situ soil thermal desorption remediation system of claim 1, wherein the extraction well is connected to an extraction fan and an exhaust gas and waste liquid treatment system via a pipeline.
7. The in-situ soil thermal desorption remediation system of claim 1, wherein the heating medium is high temperature flue gas, and the temperature of the high temperature flue gas is not less than 600 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023160947.9U CN214263209U (en) | 2020-12-24 | 2020-12-24 | Soil normal position thermal desorption repair system |
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| CN202023160947.9U CN214263209U (en) | 2020-12-24 | 2020-12-24 | Soil normal position thermal desorption repair system |
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| CN214263209U true CN214263209U (en) | 2021-09-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114101307A (en) * | 2021-11-10 | 2022-03-01 | 南京中船绿洲环保有限公司 | Fused salt circulating in-situ thermal desorption soil remediation system and method |
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2020
- 2020-12-24 CN CN202023160947.9U patent/CN214263209U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114101307A (en) * | 2021-11-10 | 2022-03-01 | 南京中船绿洲环保有限公司 | Fused salt circulating in-situ thermal desorption soil remediation system and method |
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