Integrated in-situ thermal desorption repair well

Abstract

The utility model belongs to the technical field of soil remediation, and particularly relates to an integrated in-situ thermal desorption remediation well which comprises an extraction well, a heating main well and a plurality of heating branch wells are arranged in the extraction well, and the bottoms of the heating branch wells are respectively communicated with the bottom of the heating main well through pipelines. The heating main well and the heating branch well are both arranged in the extraction well, construction procedures can be simplified, construction efficiency can be improved, construction cost can be reduced, and large-scale engineering application can be achieved. High-temperature air / liquid firstly enters the heating main well to conduct primary heating on the contaminated soil, then the high-temperature air / liquid enters the heating branch wells to conduct secondary heating on the contaminated soil and then is discharged, the heating efficiency and the contaminated soil remediation effect can be improved, and the heat utilization rate can be increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of soil remediation, and in particular relates to an integrated in-situ thermal desorption remediation well. Background Art

[0002] In-situ thermal desorption is the most commonly used remediation technology for organic contaminated soil. This technology often consumes natural gas or electricity to generate heat, heats the contaminated soil to promote the separation of organic pollutants from the soil, and then centrally purifies the pollutant vapor in the soil through extraction and other methods. Existing in-situ thermal desorption technology and equipment have disadvantages such as many equipment and facilities and high remediation costs. In-situ thermal desorption equipment includes core modules such as heating wells and vertical extraction wells. Since the maximum impact radius of a single heating well and vertical extraction well does not exceed 6m, it is often necessary to build hundreds to thousands of heating wells and vertical extraction wells in actual engineering remediation. The construction of a large number of heating wells and vertical extraction wells will significantly increase equipment procurement and construction costs. Utility Model Content

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the utility model is to provide an integrated in-situ thermal desorption well repair method which is economical, efficient, rapid and can be applied on an engineering scale.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is an integrated in-situ thermal desorption repair well, including an extraction well, in which a heating main well and multiple heating branch wells are arranged, and the bottom of each heating branch well is connected to the bottom of the heating main well through a pipeline.

[0005] Furthermore, a plurality of the heating branch wells are evenly arranged along the circumferential direction on the outside of the heating main well.

[0006] Furthermore, the ratio of the number of the heating branch wells to the number of the heating main wells is not less than 2:1.

[0007] Furthermore, the extraction well is a hollow cylinder with an open upper end and a closed lower end, and the extraction well has a flower tube section, and the flower tube section extends from 0.5m from the upper end of the extraction well to 0.5m from the lower end of the extraction well.

[0008] Furthermore, the outer surface of the floral tube segment is wrapped with a dustproof net.

[0009] Furthermore, the dustproof net is a fine stainless steel soft net.

[0010] Furthermore, a dewatering well is also provided in the extraction well.

[0011] Furthermore, the precipitation well is a hollow cylinder with openings at both ends, and the lower end of the precipitation well extends to the bottom of the extraction well.

[0012] Furthermore, a multi-parameter monitoring line is provided in the extraction well, and the lower end of the multi-parameter monitoring line extends to the bottom of the extraction well.

[0013] Furthermore, the multi-parameter monitoring line includes a temperature probe, a pressure probe, a pollutant concentration probe and a water level meter probe.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] (1) The utility model sets both the main heating well and the branch heating well in the extraction well, which can simplify the construction process, improve the construction efficiency, reduce the construction cost, and can be applied on a large scale;

[0016] (2) The bottom of the main heating well of the utility model is connected with the bottom of the branch heating well. The high-temperature air / liquid first enters the main heating well to heat the contaminated soil once, and then the high-temperature air / liquid enters the branch heating well to heat the contaminated soil twice before being discharged. This can not only improve the heating efficiency and the contaminated soil remediation effect, but also improve the utilization rate of heat;

[0017] (3) The utility model also sets a dewatering well and a multi-parameter monitoring line in the extraction well, which significantly reduces the required equipment and facilities while ensuring that the function of the in-situ thermal desorption repair well remains unchanged, thereby realizing the integration and simplification of the in-situ thermal desorption repair well. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of an integrated in-situ thermal desorption repair well provided by an embodiment of the utility model;

[0020] In the figure: 1. Dust-proof net; 2. Extraction well; 3. Multi-parameter monitoring line; 4. Dewatering well; 5. Heating branch well; 6. Heating main well. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0024] like Figure 1 As shown, this embodiment provides an integrated in-situ thermal desorption remediation well, including an extraction well 2, wherein a heating main well 6 and a plurality of heating branch wells 5 are arranged in the extraction well 2, and the bottom of each heating branch well 5 is connected to the bottom of the heating main well 6 through a pipeline. In this embodiment, both the heating main well 6 and the heating branch wells 5 are arranged in the extraction well 2, which can simplify the construction process, improve the construction efficiency, reduce the construction cost, and can be applied on a large scale. In addition, the bottom of the heating main well 6 of this embodiment is connected to the bottom of the heating branch well 5, and the high-temperature air / liquid first enters the heating main well 6 to heat the contaminated soil once, and then the high-temperature air / liquid enters the heating branch well 5 to heat the contaminated soil for a second time before being discharged, which can not only improve the heating efficiency and the contaminated soil remediation effect, but also improve the utilization rate of heat.

[0025] To optimize the above embodiment, a plurality of the heating branch wells 5 are evenly arranged along the circumferential direction outside the heating main well 6. By evenly arranging a plurality of the heating branch wells 5 around the heating main well 6, the heating range can be increased, the heating can be made more uniform, and the heating effect can be improved. Specifically, the heating branch wells 5 can be arranged at a position close to the inner wall of the extraction well 2.

[0026] Furthermore, the ratio of the number of the heating branch wells 5 to the number of the heating main wells 6 is not less than 2:1. As an embodiment, a heating main well 6 and three heating branch wells 5 are arranged in the extraction well 2, the heating main well 6 is located in the middle of the extraction well 2, and the three heating branch wells 5 are arranged at equal intervals along the circumferential direction on the outside of the heating main well 6, and the bottoms of the three heating branch wells 5 are connected to the bottom of the heating main well 6 through pipelines.

[0027] In this embodiment, the extraction well 2 is a hollow cylinder with an open upper end and a closed lower end, and the extraction well 2 has a flower tube section, and the flower tube section extends from 0.5 m from the upper end of the extraction well 2 to 0.5 m from the lower end of the extraction well 2. The polluted gas in the soil can enter the extraction well 2 through the holes of the flower tube part and be extracted.

[0028] Furthermore, the outer surface of the flower tube section of the extraction well 2 is wrapped with a dustproof net 1, which can filter water vapor and polluted gases and prevent soil dust from entering the extraction well 2.

[0029] Optimally, the dustproof net 1 adopts a fine stainless steel soft net, which has high strength, wear resistance and good chemical stability, thereby extending the service life of the dustproof net 1.

[0030] To optimize the above embodiment, a dewatering well 4 is further provided in the extraction well 2. In this embodiment, the dewatering well 4 is further provided in the extraction well 2, which can further simplify the construction and reduce the construction cost.

[0031] Furthermore, the precipitation well 4 is a hollow cylinder with openings at both ends, and the lower end of the precipitation well 4 extends to the bottom of the extraction well 2. Before heating the contaminated soil, groundwater in the extraction well 2 can be extracted through the precipitation well 4 to reduce the water content of the contaminated soil, improve the heating efficiency of the contaminated soil, and help extract the contaminated gas.

[0032] Furthermore, the main heating well 6 and the branch heating well 5 are both hollow cylinders, and can be made of stainless steel pipes.

[0033] The above embodiment is optimized, and a multi-parameter monitoring line 3 is also provided in the extraction well 2, and the lower end of the multi-parameter monitoring line 3 extends to the bottom of the extraction well 2. In this embodiment, the multi-parameter monitoring line 3 is also provided in the extraction well 2, which can further simplify the construction and reduce the construction cost. The upper end of the multi-parameter monitoring line 3 extends outside the extraction well 2 and is connected to a parameter display, and the data monitored by the multi-parameter monitoring line 3 is displayed in real time through the parameter display.

[0034] Specifically, the multi-parameter monitoring line 3 includes a temperature probe, a pressure probe, a pollutant concentration probe and a water level gauge probe. The temperature probe is used to monitor the temperature of the heating main well 6 and the temperature of the heating branch well 5, the pressure probe is used to monitor the pressure in the extraction well 2, the pollutant concentration probe is used to monitor the pollutant concentration in the extraction well 2, and the water level gauge probe is used to monitor the groundwater level in the extraction well 2. The multi-parameter monitoring line 3 may also include other probes.

[0035] The repair process of the integrated in-situ thermal desorption repair well of this embodiment is as follows:

[0036] Precipitation process: The groundwater in the extraction well 2 is continuously extracted through the precipitation well 4, and the parameter monitoring line monitors the groundwater level in real time. When the groundwater level is continuously and stably lower than 1m below the lowest end of the extraction well 2, the precipitation is completed;

[0037] Heating process: The high-temperature air / liquid first enters the heating main well 6 from the upper end to heat the contaminated soil once, and then the high-temperature air / liquid enters the heating branch well 5 from the lower end to heat the contaminated soil twice. After the heating is completed, the high-temperature air / liquid is discharged from the upper end of the heating branch well 5;

[0038] Extraction process: During the heating process, pollutants and water in the soil will be transferred from the soil to the gas through evaporation, gasification and decomposition. The extraction well 2 extracts the gas in the polluted soil to ensure that the extraction well 2 and the surrounding soil area are in a negative pressure environment. The water vapor and polluted gas generated by the polluted soil during the heating process are continuously gathered in the negative pressure area. The water vapor and polluted gas enter the extraction well 2 through the dustproof net 1. The dustproof net 1 filters the water vapor and polluted gas to prevent soil dust from clogging the flower tube part of the extraction well 2. The parameter monitoring line monitors the pressure and pollutant concentration in the extraction well 2;

[0039] Monitoring process: The parameter monitoring line monitors the temperature of the heating branch well 5 and the heating main well 6, the pressure in the extraction well 2, the pollutant concentration, the water level and other parameters throughout the whole process, and dynamically analyzes the relevant data to dynamically control the start, duration and end time of heating and extraction.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated in-situ thermal desorption well repair method, characterized in that: It comprises an extraction well, in which a main heating well and a plurality of branch heating wells are arranged, and the bottom of each branch heating well is connected with the bottom of the main heating well through a pipeline; a precipitation well is also arranged in the extraction well.

2. The integrated in-situ thermal desorption well repair method according to claim 1, characterized in that: The plurality of heating branch wells are uniformly arranged along the circumferential direction on the outer side of the heating main well.

3. The integrated in-situ thermal desorption well repair method according to claim 2, characterized in that: The ratio of the number of the heating branch wells to the number of the heating main wells is not less than 2:

1.

4. The integrated in-situ thermal desorption well repair method according to claim 1, characterized in that: The extraction well is a hollow cylinder with an open upper end and a closed lower end. The extraction well has a flower tube section, and the flower tube section extends from 0.5m from the upper end of the extraction well to 0.5m from the lower end of the extraction well.

5. The integrated in-situ thermal desorption well repair method according to claim 4, characterized in that: The outer surface of the flower tube section is wrapped with a dustproof net.

6. The integrated in-situ thermal desorption well repair method according to claim 5, characterized in that: The dustproof net is a fine stainless steel soft net.

7. The integrated in-situ thermal desorption well repair method according to claim 1, characterized in that: The precipitation well is a hollow cylinder with openings at both ends, and the lower end of the precipitation well extends to the bottom of the extraction well.

8. The integrated in-situ thermal desorption well repair method according to claim 1, characterized in that: A multi-parameter monitoring line is also provided in the extraction well, and the lower end of the multi-parameter monitoring line extends to the bottom of the extraction well.

9. The integrated in-situ thermal desorption well repair method according to claim 8, characterized in that: The multi-parameter monitoring line includes a temperature probe, a pressure probe, a pollutant concentration probe and a water level meter probe.

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