CN111014270A - In-situ thermal desorption electric heating simulation system and method - Google Patents
In-situ thermal desorption electric heating simulation system and method Download PDFInfo
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- CN111014270A CN111014270A CN202010007029.8A CN202010007029A CN111014270A CN 111014270 A CN111014270 A CN 111014270A CN 202010007029 A CN202010007029 A CN 202010007029A CN 111014270 A CN111014270 A CN 111014270A
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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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Abstract
The invention discloses an in-situ thermal desorption electric heating simulation system and a method, wherein the system comprises: the box body is used for filling soil to be repaired; the heating device is used for heating the soil to be repaired; the extraction device is used for extracting waste gas and waste liquid generated after the soil to be repaired is heated; the temperature monitoring device is used for monitoring the temperature of soil at different depths; the heat flux monitoring device is used for monitoring the heat flux of the soil at different depths; the regulating and controlling device is used for recording temperature data and heat flux data and regulating the heating power of the heating device based on the recorded data; the waste gas and liquid treatment device is used for treating extracted waste gas and waste liquid; the method comprises the following steps: filling soil in a layered mode, connecting the devices, heating the soil to be repaired to generate waste gas and liquid, and extracting the generated waste gas and liquid through an extraction device to enter a waste gas and liquid treatment device for treatment; the regulating device records the temperature data and the heat flux data and regulates the heating power of the heating device based on the recorded data.
Description
Technical Field
The invention relates to the technical field of pollution treatment, in particular to an in-situ thermal desorption electric heating simulation system and method.
Background
In recent years, the application proportion of the in-situ thermal desorption technology in the field of organic pollution site remediation is increasing year by year. The in-situ thermal desorption has the advantages of no need of excavation, earthwork transportation and thorough pollutant removal, and is widely applied to the restoration of organic pollution sites. The in-situ thermal desorption technology is a soil remediation method for promoting organic pollutants to volatilize by heating soil and collecting tail gas by vapor extraction, and common in-situ thermal desorption methods comprise 3 types of heat conduction, resistance heating and steam heating according to different heating modes, wherein the main principles of the heat conduction and the steam heating of the soil are heat conduction, heat convection and heat radiation.
However, although the in-situ thermal desorption has the advantage of efficiently removing organic pollutants, the thermal desorption system has the problems of high energy consumption, unclear energy transmission, incapability of intelligent regulation and the like in the operation process.
Chinese patent CN109647872A proposes a simulation system and method for a soil in-situ thermal remediation sandbox, which utilizes a sandbox, a heat insulation layer, clay and sand to form an integral simulation of the actual situation of field soil, and can regulate and control the thermal remediation system according to the distribution and change of the temperature field, but does not specify the energy transmission condition of the heating area. Meanwhile, the vertical distribution of the soil volume weight and the texture type on the section plane in the actual field has obvious hierarchy, and the factor that the simulation system should consider for better simulating the field condition is also included.
Disclosure of Invention
Aiming at the defects in the problems, the invention provides an in-situ thermal desorption electric heating simulation system and method.
The invention discloses an in-situ thermal desorption electric heating simulation system, which comprises:
the box body is used for filling soil to be repaired;
the heating device is inserted into the soil to be repaired and is used for heating the soil to be repaired;
the extraction device is inserted into the soil to be repaired and is used for extracting waste gas and waste liquid generated after the soil to be repaired is heated;
the temperature monitoring devices are arranged at different depths in the soil to be repaired and are used for monitoring the temperatures of the soil at different depths;
the heat flux monitoring devices are arranged at different depths in the soil to be repaired and are used for monitoring the heat fluxes of the soils at different depths;
the input end of the regulating device is connected with the temperature monitoring device and the heat flux monitoring device, and the output end of the regulating device is connected with the heating device; the temperature data and the heat flux data of the heat flux monitoring device are recorded, and the heating power of the heating device is adjusted based on the temperature data and the heat flux data;
and the waste gas and liquid treatment device is connected with the extraction device and is used for treating extracted waste gas and waste liquid.
As a further improvement of the invention, the box body is an insulation box;
the unit weight of the soil to be repaired is sequentially increased from top to bottom, and the soil texture type is sequentially from top to bottom: loam, sandy soil and clay soil.
As a further improvement of the invention, the heating device comprises an electric heating rod, the electric heating rod is inserted into the soil to be repaired, and the tail end of the electric heating rod is connected with the regulating device through a lead.
As a further improvement of the invention, the extraction device comprises a vacuum pump and a plurality of steel pipes with holes, the ends with holes of the steel pipes with holes are inserted into the soil to be repaired, and the other ends of the steel pipes with holes are connected with one end of the waste gas-liquid treatment device through a waste gas-liquid pipeline;
the vacuum pump is connected with the other end of the waste gas-liquid treatment device and is used for providing power for extracting waste gas-liquid.
As a further improvement of the invention, the temperature monitoring device comprises a plurality of thermocouple sensors, the thermocouple sensors are inserted at different depths in the soil to be repaired, and the thermocouple sensors are connected with the regulating device through leads.
As a further improvement of the invention, the soil heat flux monitoring device comprises a plurality of soil heat flux sensors, the soil heat flux sensors are vertically inserted at different depths in the soil to be repaired, and the soil heat flux sensors are connected with the regulating device through leads.
As a further improvement of the invention, the soil remediation agent is respectively inserted into the lower layer, the middle layer and the upper layer of the soil to be remedied.
As a further improvement of the invention, the regulation and control device comprises a data acquisition instrument, a power regulator and a switch;
the data acquisition instrument is connected with the temperature monitoring device and the heat flux monitoring device;
the power regulator is connected with the data acquisition instrument and the heating device;
the switch is connected with the data acquisition instrument and the power regulator.
As a further improvement of the invention, the waste gas liquid treatment device comprises a condensation tank and an adsorption tank;
and the extracted waste gas and waste liquid enter the condensing tank and the adsorption tank in sequence.
The invention also discloses an in-situ thermal desorption electric heating restoration simulation method, which is realized based on the in-situ thermal desorption electric heating simulation system and comprises the following steps:
filling soil in layers, the volume weight of the soil increases in proper order from top to bottom, and the soil texture type is in proper order: loam, sandy soil and clay soil;
inserting a heating device, an extraction device, a temperature monitoring device and a heat flux monitoring device into the soil to be repaired, connecting a regulating device with the temperature monitoring device, the heat flux monitoring device and the heating device, and connecting the extraction device with a waste gas liquid treatment device;
heating the soil to be repaired to generate waste gas and waste liquid, and extracting the generated waste gas and waste liquid by the extraction device to enter the waste gas and liquid treatment device for treatment;
the regulating and controlling device records the temperature data of the temperature monitoring device and the heat flux data of the heat flux monitoring device and regulates the heating power of the heating device based on the temperature data and the heat flux data.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the heating device is arranged in the soil in the heat preservation box, the temperature monitoring device is used for collecting the soil temperature at different depths, and the heat flux monitoring device is used for collecting the heat flux at different depths, so that the heat transmission condition of the soil can be clearly known, and reliable guidance is provided for engineering practice;
the filling method provided by the invention ensures that the volume weight gradient distribution trend is consistent, thereby being beneficial to better simulating the actual situation of a field;
the regulating device provided by the invention can be used for regulating the heating power of the heating device according to the change of temperature and heat flux, thus being beneficial to intelligently controlling heating and being beneficial to intellectualization of a thermal repair system.
Drawings
Fig. 1 is a schematic structural diagram of an in-situ thermal desorption electric heating simulation system according to an embodiment of the present invention.
In the figure:
1. a heating device; 2. an extraction device; 3. a temperature monitoring device; 4. a heat flux monitoring device; 5. a regulating device; 6. a waste gas liquid treatment device; 7. a heat preservation box; 8. a vacuum pump.
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. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the in-situ thermal desorption electric heating simulation system provided by the invention has the characteristics of being capable of controlling soil flux and temperature change, and is beneficial to intellectualization of a soil remediation system; it includes: the device comprises a heating device 1, an extraction device 2, a temperature monitoring device 3, a heat flux monitoring device 4, a regulation and control device 5, a waste gas liquid treatment device 6, a box body and a vacuum pump 8;
the box body is used for filling soil to be repaired; the box body of the invention is preferably provided with an insulation box 7 with insulation performance, and the material of the insulation box can be composed of various insulation materials; the soil to be restored filled in the heat preservation box 7 can be filled in three levels, the volume weight of the soil increases from top to bottom, the texture type of the soil is determined from top to bottom according to the texture type of the field, and loam, sandy soil and clay soil can be selected; the structure of the soil to be repaired is beneficial to better simulating the actual situation of the field.
The heating device 1 of the invention is inserted into soil to be repaired and used for heating the soil to be repaired; the heating device 1 can adopt one or more electric heating rods or other heating equipment, and the electric heating rods are inserted into the soil to be repaired to heat the soil to be repaired so that the soil to be repaired is heated to generate waste gas and waste liquid; the tail end of the electric heating rod is connected with a regulating device 5 through a lead wire, and receives the power regulation of the regulating device 5 on the electric heating rod; namely, the regulating device 5 intelligently changes the heating power of the electric heating rod through the power regulator.
The extraction device 2 is inserted into soil to be repaired and is used for extracting waste gas and waste liquid generated after the soil to be repaired is heated; the extraction device 2 comprises a vacuum pump 8 and a plurality of steel pipes with holes, the ends with holes of the steel pipes with holes are inserted into soil to be repaired, and waste gas and liquid generated in the soil to be repaired are collected through the holes in the steel pipes; the other ends of the plurality of steel pipes with holes are connected with one end of a waste gas liquid treatment device 6 through a waste gas liquid pipeline, and a vacuum pump 8 is connected with the other end of the waste gas liquid treatment device 6 and used for providing power for extracting waste gas liquid; because the surface layer of the soil can form a sealing structure, the waste gas and the waste liquid of the soil to be repaired are pumped by a vacuum pump and enter the waste gas and liquid treatment device 6 for treatment.
The temperature monitoring device 3 is arranged at different depths in soil to be repaired and is used for monitoring the temperatures of the soil at different depths; wherein, temperature monitoring devices 3 includes a plurality of thermocouple sensors, and a plurality of thermocouple sensors insert the different degree of depth department in the soil that waits to restore, and a plurality of thermocouple sensors pass through the lead wire and link to each other with regulation and control device 5, transmit the temperature data of the different degree of depth of soil that the thermocouple sensor gathered to regulation and control device 5. Furthermore, when the soil to be restored can be filled in three layers (soil, sandy soil and clay soil in sequence from top to bottom), at least one thermocouple sensor is arranged on each layer.
The heat flux monitoring device 4 is arranged at different depths in the soil to be repaired and is used for monitoring the heat flux of the soil at different depths; the heat flux monitoring device 4 comprises a plurality of soil heat flux sensors, the soil heat flux sensors are horizontally or vertically inserted into different depths of soil to be repaired, the soil heat flux sensors are connected with the regulating device through leads, and heat flux data of the soil, collected by the soil heat flux sensors, at different depths are transmitted to the regulating device 5. Furthermore, when the soil to be restored can be filled in three layers (soil, sandy soil and clay soil in sequence from top to bottom), at least one soil heat flux sensor is arranged on each layer.
The input end of a regulating device 5 is connected with a temperature monitoring device 3 and a heat flux monitoring device 4, and the output end is connected with a heating device 1; the device is used for recording temperature data of the temperature monitoring device 3 and heat flux data of the heat flux monitoring device 4, and adjusting the heating power of the heating device 1 based on the temperature data and the heat flux data; wherein, the regulating device 5 comprises a data acquisition instrument, a power regulator and a switch; the data acquisition instrument is connected with the temperature monitoring device and the heat flux monitoring device; the power regulator is connected with the data acquisition instrument and the heating device; the switch is connected with the data acquisition instrument and the power regulator.
The waste gas liquid treatment device 6 is connected with the extraction device 2 and is used for treating extracted waste gas and waste liquid; wherein, waste gas liquid treatment device 6 includes condensate tank and adsorption tank, and the waste gas waste liquid of extraction gets into condensate tank and adsorption tank in proper order.
The invention also provides a restoration simulation method based on the in-situ thermal desorption electric heating restoration simulation, which comprises the following steps:
filling soil to be restored in the box body in three levels; wherein, the volume weight of soil increases in proper order under to from the top down, and soil texture type is in proper order: loam, sandy soil and clay soil;
inserting a heating device, an extraction device, a temperature monitoring device and a heat flux monitoring device into soil to be restored, connecting a regulating device with the temperature monitoring device, the heat flux monitoring device and the heating device, and connecting the extraction device with a waste gas liquid treatment device;
heating the soil to be repaired to generate waste gas and waste liquid, and extracting the generated waste gas and waste liquid by an extraction device to enter a waste gas and liquid treatment device for treatment;
the regulating and controlling device records the temperature data of the temperature monitoring device and the heat flux data of the heat flux monitoring device, and regulates the heating power of the heating device based on the temperature data and the heat flux data;
when the soil temperature does not reach the target value, if the heat flux signal shows a decreasing trend, the regulating and controlling system regulates the heating device to increase the heating power so as to ensure the heat transfer rate of the soil and enable the restoration area to reach the target temperature in a short time.
The invention has the advantages that:
according to the invention, the heating device is arranged in the soil in the heat preservation box, the temperature monitoring device is used for collecting the soil temperature at different depths, and the heat flux monitoring device is used for collecting the heat flux at different depths, so that the heat transmission condition of the soil can be clearly known, and reliable guidance is provided for engineering practice;
the filling method provided by the invention ensures that the volume weight gradient distribution trend is consistent, thereby being beneficial to better simulating the actual situation of a field;
the regulating device provided by the invention can be used for regulating the heating power of the heating device according to the change of temperature and heat flux, thus being beneficial to intelligently controlling heating and being beneficial to intellectualization of a thermal repair system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An in-situ thermal desorption electric heating simulation system, comprising:
the box body is used for filling soil to be repaired;
the heating device is inserted into the soil to be repaired and is used for heating the soil to be repaired;
the extraction device is inserted into the soil to be repaired and is used for extracting waste gas and waste liquid generated after the soil to be repaired is heated;
the temperature monitoring devices are arranged at different depths in the soil to be repaired and are used for monitoring the temperatures of the soil at different depths;
the heat flux monitoring devices are arranged at different depths in the soil to be repaired and are used for monitoring the heat fluxes of the soils at different depths;
the input end of the regulating device is connected with the temperature monitoring device and the heat flux monitoring device, and the output end of the regulating device is connected with the heating device; the temperature data and the heat flux data of the heat flux monitoring device are recorded, and the heating power of the heating device is adjusted based on the temperature data and the heat flux data;
and the waste gas and liquid treatment device is connected with the extraction device and is used for treating extracted waste gas and waste liquid.
2. The in-situ thermal desorption electric heating simulation system of claim 1, wherein the box body is an incubator;
the unit weight of the soil to be repaired is sequentially increased from top to bottom, and the soil texture type is sequentially from top to bottom: loam, sandy soil and clay soil.
3. The in-situ thermal desorption electric heating simulation system as claimed in claim 1, wherein the heating device comprises an electric heating rod, the electric heating rod is inserted into the soil to be repaired, and the tail end of the electric heating rod is connected with the regulating device through a lead.
4. The in-situ thermal desorption electric heating simulation system as claimed in claim 1, wherein the extraction device comprises a vacuum pump and a plurality of steel pipes with holes, the ends with holes of the steel pipes with holes are inserted into the soil to be repaired, and the other ends of the steel pipes with holes are connected with one end of the waste gas liquid treatment device through a waste gas liquid pipeline;
the vacuum pump is connected with the other end of the waste gas-liquid treatment device and is used for providing power for extracting waste gas-liquid.
5. The in-situ thermal desorption electric heating simulation system of claim 1, wherein the temperature monitoring device comprises a plurality of thermocouple sensors, the plurality of thermocouple sensors are inserted at different depths in the soil to be remediated, and the plurality of thermocouple sensors are connected to the regulating device through leads.
6. The in-situ thermal desorption electric heating simulation system of claim 5, wherein the soil heat flux monitoring device comprises a plurality of soil heat flux sensors vertically inserted at different depths in the soil to be remediated, the plurality of soil heat flux sensors being connected to the conditioning device by leads.
7. The in-situ thermal desorption electric heating simulation system of claim 6, wherein the system is inserted in the lower layer, the middle layer and the upper layer of the soil to be repaired respectively.
8. The in-situ thermal desorption electric heating simulation system of claim 1, wherein the regulating and controlling device comprises a data acquisition instrument, a power regulator and a switch;
the data acquisition instrument is connected with the temperature monitoring device and the heat flux monitoring device;
the power regulator is connected with the data acquisition instrument and the heating device;
the switch is connected with the data acquisition instrument and the power regulator.
9. The in-situ thermal desorption electric heating simulation system of claim 1, wherein the waste gas liquid treatment device comprises a condensation tank and an adsorption tank;
and the extracted waste gas and waste liquid enter the condensing tank and the adsorption tank in sequence.
10. An in-situ thermal desorption electric heating repair simulation method for the in-situ thermal desorption electric heating simulation system of any one of claims 1 to 9, comprising:
filling soil in layers, the volume weight of the soil increases in proper order from top to bottom, and the soil texture type is in proper order: loam, sandy soil and clay soil;
inserting a heating device, an extraction device, a temperature monitoring device and a heat flux monitoring device into the soil to be repaired, connecting a regulating device with the temperature monitoring device, the heat flux monitoring device and the heating device, and connecting the extraction device with a waste gas liquid treatment device;
heating the soil to be repaired to generate waste gas and waste liquid, and extracting the generated waste gas and waste liquid by the extraction device to enter the waste gas and liquid treatment device for treatment;
the regulating and controlling device records the temperature data of the temperature monitoring device and the heat flux data of the heat flux monitoring device and regulates the heating power of the heating device based on the temperature data and the heat flux data.
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Cited By (3)
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| CN112433040A (en) * | 2020-10-15 | 2021-03-02 | 天津大学 | Soil normal position thermal desorption experiment analogue means |
| CN113787089A (en) * | 2021-09-14 | 2021-12-14 | 北京航空航天大学 | Multi-well comprehensive management and control strategy for heating field of in-situ thermal desorption system |
| CN116511232A (en) * | 2023-05-06 | 2023-08-01 | 北京建工环境修复股份有限公司 | Soil pollution in-situ heat treatment device and treatment method |
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