CN111036659A - Electric heating in-situ thermal desorption structure for pollution field - Google Patents
Electric heating in-situ thermal desorption structure for pollution field Download PDFInfo
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- CN111036659A CN111036659A CN201911319308.1A CN201911319308A CN111036659A CN 111036659 A CN111036659 A CN 111036659A CN 201911319308 A CN201911319308 A CN 201911319308A CN 111036659 A CN111036659 A CN 111036659A
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- 238000005485 electric heating Methods 0.000 title claims abstract description 58
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 42
- 238000003795 desorption Methods 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 125
- 238000000605 extraction Methods 0.000 claims abstract description 62
- 238000012544 monitoring process Methods 0.000 claims abstract description 62
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000009413 insulation Methods 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 17
- 238000011049 filling Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 239000002912 waste gas Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 58
- 239000002689 soil Substances 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000002341 toxic gas Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- 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
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
An electrically heated in-situ thermal desorption structure for a contaminated site, comprising: the heating well penetrates through the polluted site to the lower part of the polluted site, and an electric heating rod is inserted into the heating well and used for heating the interior of the polluted site; the temperature and pressure monitoring well penetrates through the polluted site, is parallel to the heating well, and is used for monitoring the temperature and the pressure of an in-situ thermal desorption area in the polluted site; the extraction well penetrates through the polluted site to the lower part of the polluted site, is parallel to the heating well, and is used for extracting gas and liquid generated by the heated polluted site; and the controller is used for controlling the starting and stopping of the electric heating rod and controlling the starting and stopping of the extraction well according to the temperature and pressure signals monitored by the temperature and pressure monitoring well. The electric heating in-situ thermal desorption structure of the pollution field, disclosed by the invention, has the advantages that the heating process is automatically controlled by the controller, the energy is saved, the consumption is reduced, and a plurality of risks and construction interference factors in-situ thermal desorption are reduced.
Description
Technical Field
The invention belongs to the technical field of pollution treatment, and particularly relates to an electric heating in-situ thermal desorption structure of a pollution field.
Background
In recent years, an in-situ thermal desorption technology has been developed into an important technology for repairing soil and underground water of an organic pollution site which is difficult to treat, and the technology mainly aims at repairing a site polluted by volatile or difficult-to-volatilize organic compounds and has obvious advantages in repairing a pollutant site with low permeability. The technology improves the separation, volatilization or fluidity of organic pollutants and soil by heating the polluted site. Then capturing and collecting the desorbed pollutants by means of extraction and the like, and carrying out centralized treatment.
The in-situ thermal desorption technology mainly comprises the following steps according to a heating mode: resistance heating, steam heating and heat conduction heating, and electric heating is as the emerging mode of heat conduction heating, directly converts the electric energy into heat energy, and the direct heating pollutes the region, has characteristics such as heating system equipment is simple, degree of automation is high, the site conditions requires lowly, therefore electric heating will be the mainstream mode among the normal position heat takes off the technique.
In the electric heating mode, the electrode bar generates heat greatly, and the heat is difficult to scatter in short time, has the spontaneous combustion risk, and electric heating rod operating time still fails accurate control. The existing electric heating in-situ desorption construction structure is easy to dissipate heating heat from the surface layer in the field repair application, the energy consumption is lost, and the cost is increased; the extraction well is easy to be blocked by particles in the working process; when the heating well works, the heating rate of the soil in the heating area is to be improved. Therefore, it is necessary to develop an electric heating in-situ thermal desorption structure in a contaminated field, which can protect the electric heating rod, and has low energy consumption and high heating efficiency.
Disclosure of Invention
The invention aims to provide an electric heating in-situ thermal desorption structure of a polluted field, which can protect an electric heating rod, reduce heat energy loss and improve heating efficiency.
In order to achieve the above object, the present invention provides an electric heating in-situ thermal desorption structure for a contaminated field, comprising:
the heating well penetrates through the polluted site to the position below the polluted site, and an electric heating rod is inserted into the heating well and used for heating the interior of the polluted site;
the temperature and pressure monitoring well penetrates through the polluted site, is parallel to the heating well, and is used for monitoring the temperature and the pressure of an in-situ thermal desorption area in the polluted site;
the extraction well penetrates through the polluted site to the lower part of the polluted site, is parallel to the heating well, and is used for extracting gas and liquid generated by the heated polluted site;
and the controller is used for controlling the starting and stopping of the electric heating rod and controlling the starting and stopping of the extraction well according to the temperature and pressure signals monitored by the temperature and pressure monitoring well.
Preferably, the system further comprises a heat insulation layer, wherein the heat insulation layer is arranged above the heating well, the temperature and pressure monitoring well and the extraction well; the electric heating rod is electrically connected with the controller through a lead penetrating through the heat insulation layer.
Preferably, the thermal insulation layer comprises a covering layer and a particle layer from top to bottom in sequence, the covering layer is made of concrete, and the particle layer is made of at least one of broken stone, gravel and quartz sand.
Preferably, the temperature and pressure monitoring well comprises a monitoring pipe, and a temperature detector and a pressure detector which are arranged in the monitoring pipe, wherein the temperature detector and the pressure detector are in signal connection with the controller, one end of the monitoring pipe penetrates through the heat insulation layer to the ground surface, and the other end of the monitoring pipe extends into the lower part of the polluted site.
Preferably, an extraction pipe is inserted into the extraction well, and one end of the extraction pipe extends out of the heat insulation layer;
the extraction pipe is connected with a power device in a driving mode, the power device is electrically connected with the controller, and the controller controls starting and stopping of the power device according to temperature and pressure signals monitored by the temperature detector and the pressure detector so as to extract gas and liquid generated by the heated polluted site and transmit the gas and the liquid through a waste gas conveying pipeline.
Preferably, a plurality of inlets are arranged on the side wall of the pipe section of the extraction pipe below the heat insulation layer, and a filling layer is arranged between the pipe wall of the extraction pipe and the wall of the extraction well.
Preferably, a thermocouple sensor heating pipe is further arranged in the heating well, the heating pipe is inserted in the heating well, the electric heating rod is inserted in the heating pipe, the thermocouple sensor is arranged between the well wall of the heating well and the heating pipe, and the controller controls the starting and stopping of the electric heating rod according to a temperature signal monitored by the thermocouple sensor in the heating well.
Preferably, a heat conduction buffer layer is arranged between the heating pipe and the wall of the heating well, and a heat insulation filling material is arranged between the lead and the heat insulation layer.
Preferably, the system further comprises at least one heat conducting well, wherein the heat conducting well is parallel to the heating well and is arranged between the heating well and the temperature pressure monitoring well and/or between the temperature pressure monitoring well and the extraction well.
Preferably, iron chips and/or gravel are arranged in the heat conducting well.
The invention relates to an electric heating in-situ thermal desorption structure of a pollution field, which has the beneficial effects that: the heating process is automatically controlled by the controller, so that energy conservation and consumption reduction are facilitated; the energy consumption is reduced through the isolation layer and the heat conduction well, and the energy utilization efficiency is improved; and a plurality of risks and construction interference factors in-situ heat desorption, such as toxic gas overflow, rainfall interference and the like, are reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic structural view of a contaminated field electrically heated in-situ thermal desorption structure of an exemplary embodiment of the present invention;
description of reference numerals:
1 heater well, 2 temperature pressure monitoring wells, 3 extraction wells, 4 electrical heating rods, 5 wires, 6 heat conduction buffer layers, 7 granular layers, 8 overburden layers, 9 heating pipes, 10 monitoring pipe caps, 11 monitoring pipes, 12 waste gas conveying pipelines, 13 extraction pipes, 14 filling layers, 15 heat conduction wells and 16 heat insulation filling materials.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to solve the problems in the prior art, the invention provides an electric heating in-situ thermal desorption structure of a polluted field, which comprises:
the heating well penetrates through the polluted site to the lower part of the polluted site, and an electric heating rod is inserted into the heating well and used for heating the interior of the polluted site;
the temperature and pressure monitoring well penetrates through the polluted site, is parallel to the heating well, and is used for monitoring the temperature and the pressure of an in-situ thermal desorption area in the polluted site;
the extraction well penetrates through the polluted site to the lower part of the polluted site, is parallel to the heating well, and is used for extracting gas and liquid generated by the heated polluted site;
and the controller is used for controlling the starting and stopping of the electric heating rod and controlling the starting and stopping of the extraction well according to the temperature and pressure signals monitored by the temperature and pressure monitoring well.
The electric heating in-situ thermal desorption structure of the pollution field, disclosed by the invention, has the advantages that the heating process is automatically controlled by the controller, the energy conservation and the consumption reduction are facilitated, and a plurality of risks and construction interference factors in-situ thermal desorption, such as toxic gas overflow, rainfall interference and the like, are reduced.
Preferably, the system also comprises a heat insulation layer which is arranged above the heating well, the temperature and pressure monitoring well and the extraction well; the electric heating rod is electrically connected with the controller through a lead penetrating through the heat insulation layer. The energy consumption is reduced through the isolation layer, and the energy utilization efficiency is improved.
Preferably, the thermal insulation layer comprises a covering layer and a particle layer from top to bottom in sequence, the covering layer is made of concrete, and the particle layer is made of at least one of broken stone, gravel and quartz sand. The concrete is used as the covering layer, so that heat can be effectively prevented from being dissipated to the atmosphere through the granular layer, energy consumption is saved, and toxic gas generated after a polluted site is heated can be prevented from overflowing and rainfall interference; particulate matters such as broken stones are adopted as particle layers, and impurities mixed in gas particles can be filtered.
Preferably, the thickness of the heat insulation layer is 0.1-0.3 m; the thickness of the particle layer is 0.1-0.5 m.
Preferably, the temperature and pressure monitoring well comprises a monitoring pipe, and a temperature detector and a pressure detector which are arranged in the monitoring pipe, wherein the temperature detector and the pressure detector are in signal connection with the controller, one end of the monitoring pipe penetrates through the heat insulation layer to the ground surface, and the other end of the monitoring pipe extends into the lower part of the polluted site. The temperature detector is used for monitoring the temperature of an in-situ thermal desorption area of the polluted site, the pressure detector is used for monitoring the air pressure of the in-situ thermal desorption area, and when the temperature and the air pressure reach preset high values, the controller controls the electric heating rod to stop heating according to the signal and controls the extraction well to start; when the temperature and the air pressure reach preset low values, the controller controls the electric heating rod to start to heat according to the signal, and controls the extraction well to stop running. The controller is an existing product, can control the switches of the temperature detector and the pressure detector to be turned off, and can record and store temperature and pressure information.
Preferably, the monitoring tube is made of a stainless steel tube having a diameter of 2-6 cm; the end part of the monitoring pipe positioned outside is provided with a monitoring pipe cap used for preventing dust or rain.
Preferably, the distance between the end of the monitoring tube below the contaminated site and the contaminated site is 1-2 m.
Preferably, an extraction pipe is inserted into the extraction well, and one end of the extraction pipe extends out of the heat insulation layer;
the extraction pipe is connected with the power device in a driving mode, the power device is electrically connected with the controller, the controller controls the starting and stopping of the power device according to the temperature and pressure signals monitored by the temperature detector and the pressure detector, so that gas and liquid generated in a heated polluted site are extracted, and the gas and the liquid are transmitted through the waste gas conveying pipeline to be treated subsequently.
Preferably, the power means is a pump.
Preferably, the bottom end of the extraction well is spaced from the contaminated site by a distance of 1-1.5m, and the other end of the extraction pipe extends below the contaminated area by a distance of 0.8-1.2m from the contaminated site to ensure thorough removal of contaminants.
Preferably, a plurality of inlets are arranged on the side wall of the pipe section of the extraction pipe below the heat insulation layer, so that gas particles can enter the extraction pipe conveniently, and a filling layer is arranged between the pipe wall of the extraction pipe and the wall of the extraction well.
Preferably, each inlet is 1-3mm in diameter, and the filling layer is made of quartz sand and used for filtering soil dust particles mixed in the gas and preventing large particles from entering the extraction well to cause the blockage of the extraction well.
Preferably, a thermocouple sensor and a heating pipe are further arranged in the heating well, the heating pipe is inserted in the heating well, the electric heating rod is inserted in the heating pipe, the thermocouple sensor is arranged on the wall of the heating well, namely soil, and between the heating pipe, and the controller controls the start and stop of the electric heating rod according to a temperature signal monitored by the thermocouple sensor in the heating well.
Preferably, the distance between the bottom end of the heating well and the polluted site is 1-1.5m, so that the heating area is ensured to penetrate through the polluted site, and the removal effect of pollutants is improved; the distance between the bottom end of the heating pipe and the bottom end of the heating well is 0.4-0.6 m.
Preferably, the bottom end of the heating tube is closed, and magnesium oxide particles are filled in the heating tube to improve the heat conduction efficiency. The heating pipe and the material filled in the heating pipe can have a certain protection effect on the electric heating rod.
Preferably, the material of the electric heating rod is nickel-chromium alloy.
Preferably, a heat conduction buffer layer is arranged between the heating pipe and the wall of the heating well, and a heat insulation and insulation filling material is arranged between the conducting wire and the heat insulation layer.
Preferably, the heat conducting buffer layer is made of heat conducting sand and used for reducing heat bias flow and improving transverse heat transmission; the heat insulation insulating material is made of aluminum silicate fiber, and heat is prevented from being dissipated from the conducting wire. The high-heat-conductivity material such as gravel is used as a heat-conducting buffer layer, so that heat of the heating pipe can be diffused to soil, and the temperature rise of the heating pipe caused by the fact that the heat generated by the heating pipe cannot be transmitted outwards, and further the heat is lost, and elements in the heating pipe or an electric heating rod are burnt out.
Preferably, the system further comprises at least one heat conducting well, wherein the heat conducting well is parallel to the heating well and is arranged between the heating well and the temperature pressure monitoring well and/or between the temperature pressure monitoring well and the extraction well. Through the heat conduction well, energy consumption can be reduced, and energy utilization efficiency is improved.
Preferably, the heat conducting well is made of stainless steel tubing. The heat conduction well is arranged near the heating well to improve the heating speed of the heating area. The construction structure greatly improves the heating rate of the heating area, can enlarge the heating area, reduces heat loss, and has the function of filtering soil dust.
Preferably, iron chips and/or gravel are arranged in the heat conduction well, the iron chips and the gravel are made of high-heat-conductivity materials, so that the heat flux passing through the heat conduction well can be increased, and the heating rate of the heating area is further improved. According to the Fourier law, the heat is the thermal conductivity X temperature gradient, and after the heat conducting well with high thermal conductivity is arranged, the thermal conductivity is far greater than that of the heat conducting well without the heat conducting well, so that the heat is increased, and the temperature of the surrounding soil is raised more quickly; the heat quantity is increased, so that the transmission range is farther, and the heat quantity transmission efficiency is improved; the heat gain also helps to solve the cold end problem that heater well radiation edges are prone to.
Example 1
As shown in fig. 1, the present invention provides an electric heating in-situ thermal desorption structure for a contaminated field, comprising:
the heating well 1 penetrates through the polluted site to the lower part of the polluted site, and an electric heating rod 4 is inserted into the heating well 1 and used for heating the interior of the polluted site;
the temperature and pressure monitoring well 2 penetrates through the polluted site, is parallel to the heating well 1, and is used for monitoring the temperature and the pressure of an in-situ thermal desorption area in the polluted site;
the extraction well 3 penetrates through the polluted site to the lower part of the polluted site, is parallel to the heating well 1, and is used for extracting gas and liquid generated by the heated polluted site;
and the controller controls the start and stop of the electric heating rod 4 and controls the start and stop of the extraction well 3 according to the temperature and pressure signals monitored by the temperature and pressure monitoring well 2.
In the embodiment, the device also comprises a heat insulation layer which is arranged above the heating well 1, the temperature and pressure monitoring well 2 and the extraction well 3; the electric heating rod 4 is electrically connected with the controller through a lead wire penetrating through the heat insulation layer.
The heat-insulating layer comprises a covering layer 8 and a granular layer 7 from top to bottom in sequence, wherein the covering layer 8 is made of concrete, and the granular layer 7 is made of broken stones. The thickness of the heat insulation layer is 0.2 m; the thickness of the particle layer 7 was 0.3 m.
The temperature and pressure monitoring well 2 comprises a monitoring pipe 11, and a temperature detector and a pressure detector which are arranged in the monitoring pipe 11, wherein the temperature detector and the pressure detector are in signal connection with a controller, one end of the monitoring pipe 11 penetrates through the heat insulation layer to the ground surface, and the other end of the monitoring pipe extends into the lower part of the polluted site. The temperature detector is used for monitoring the temperature of an in-situ thermal desorption area of the polluted site, the pressure detector is used for monitoring the air pressure of the in-situ thermal desorption area, and when the temperature and the air pressure reach preset high values, the controller controls the electric heating rod 4 to stop heating according to the signal and controls the extraction well 3 to start; when the temperature and the air pressure reach preset low values, the controller controls the electric heating rod 4 to start to heat according to the signal, and controls the extraction well 3 to stop running. The controller is an existing product, can control the closing of the switches of the temperature detector and the pressure detector, can record and store temperature and pressure information, and improves the automation degree.
The monitoring pipe 11 is made of a stainless steel pipe having a diameter of 4 cm; the end of the monitoring tube 11 located outside is provided with a monitoring cap 10. The distance between the end of the monitoring pipe 11 below the contaminated site and the contaminated site was 1.5 m.
An extraction pipe 13 is inserted into the extraction well 3, and one end of the extraction pipe 13 extends out of the heat insulation layer; the extraction pipe 13 is connected with the power device in a driving mode, the power device is electrically connected with the controller, the controller controls the starting and stopping of the power device according to the temperature and pressure signals monitored by the temperature detector and the pressure detector, so that gas and liquid generated in a heated polluted site are extracted, and the gas and the liquid are transmitted through the waste gas conveying pipeline 12 to be subjected to subsequent treatment.
In this embodiment, the power plant is a pump. The distance between the bottom end of the extraction well 3 and the polluted site is 1.5m, the other end of the extraction pipe 13 extends into the lower part of the polluted area, and the distance between the extraction well and the polluted site is 1m, so that pollutants can be thoroughly removed. The side wall of the pipe section of the extraction pipe 13 below the heat insulation layer is provided with a plurality of inlets, and a filling layer 14 is arranged between the pipe wall of the extraction pipe 13 and the wall of the extraction well 3. Each inlet has a diameter of 2mm and the packing layer 14 is made of quartz sand for filtering soil dust particles mixed in the gas.
The heating well 1 is also internally provided with a thermocouple sensor and a heating pipe 9, the heating pipe 9 is inserted into the heating well 1, the electric heating rod 4 is inserted into the heating pipe 9, the thermocouple sensor is arranged on the wall of the heating well 1, namely soil, and between the heating pipe 9, and the controller controls the start and stop of the electric heating rod 4 according to a temperature signal in the heating well 1 monitored by the thermocouple sensor.
The distance between the bottom end of the heating well 1 and the polluted site is 1.5m, so that the heating area is ensured to penetrate through the polluted site, and the removal effect of pollutants is improved; the distance between the bottom end of the heating pipe 9 and the bottom end of the heating well 1 is 0.5 m. The bottom end of the heating pipe 9 is closed, and magnesium oxide particles are filled in the heating pipe 9 to improve the heat conduction efficiency. The electric heating rod 4 is made of nickel-chromium alloy.
A heat conduction buffer layer 6 is arranged between the heating pipe 9 and the wall of the heating well 1, and a heat insulation filling material 16 is arranged between the conducting wire and the heat insulation layer.
In the present embodiment, the heat conductive buffer layer 6 is made of heat conductive sand; the thermal insulation material is made of alumina silicate fiber.
In this embodiment, at least one heat conducting well 15 is further included, the heat conducting well 15 is parallel to the heating well 1, and the heat conducting well 15 is disposed between the heating well 1 and the temperature pressure monitoring well 2 and between the temperature pressure monitoring well 2 and the extraction well 3. The heat conducting well 15 is made of stainless steel pipe. Iron chips are arranged in the heat conduction well 15.
The electric heating in-situ thermal desorption structure of the polluted field overcomes the defects of the existing in-situ electric heating desorption technology, such as the problems of higher energy consumption, low electric heating efficiency, overflow of gas particles, rainfall interference and the like in field repair application; the automation degree is high, the energy-saving and consumption-reducing effects are good, and the method can be suitable for in-situ remediation of polluted sites of various scales; the method fully reduces a plurality of risks and construction interference factors in the in-situ heat desorption, such as toxic gas overflow, rainfall interference and the like, can set parameters such as the shape, the number and the depth of the heating tube according to the pollution degree and the depth, has wide application range and low cost.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. An electric heating in-situ thermal desorption structure for a contaminated site, comprising:
the heating well (1) penetrates through the polluted site to the lower part of the polluted site, and an electric heating rod (4) is inserted into the heating well (1) and used for heating the interior of the polluted site;
the temperature and pressure monitoring well (2) penetrates through the polluted site, is parallel to the heating well (1), and is used for monitoring the temperature and the pressure of an in-situ thermal desorption area in the polluted site;
the extraction well (3) penetrates through the polluted site to the position below the polluted site, is parallel to the heating well (1) and is used for extracting gas and liquid generated by the heated polluted site;
and the controller is used for controlling the starting and stopping of the electric heating rod (4) and controlling the starting and stopping of the extraction well (3) according to the temperature and pressure signals monitored by the temperature and pressure monitoring well (2).
2. The in-situ thermal desorption structure by electric heating in a contaminated field according to claim 1, further comprising a thermal insulation layer disposed above the heating well (1), the temperature and pressure monitoring well (2) and the extraction well (3); the electric heating rod (4) is electrically connected with the controller through a lead (5) penetrating through the heat insulation layer.
3. Electrically heated in-situ thermal desorption structure for contaminated sites according to claim 2, characterized in that the thermal insulation layer comprises, from top to bottom, a cover layer (8) and a particle layer (7), the cover layer (8) being made of concrete and the particle layer (7) being made of at least one of crushed stone, gravel and quartz sand.
4. The in-situ electric heating thermal desorption structure in a contaminated site according to claim 2, wherein the temperature and pressure monitoring well (2) comprises a monitoring pipe (11) and a temperature detector and a pressure detector which are arranged in the monitoring pipe (11), the temperature detector and the pressure detector are in signal connection with the controller, one end of the monitoring pipe (11) penetrates through the thermal insulation layer to the ground surface, and the other end of the monitoring pipe extends into the lower part of the contaminated site.
5. The in-situ thermal desorption structure by electric heating in a polluted field according to claim 4, characterized in that an extraction pipe (13) is inserted into the extraction well (3), and one end of the extraction pipe (13) extends out of the heat insulation layer;
the extraction pipe (13) is connected to a power device in a driving mode, the power device is electrically connected with the controller, the controller controls the power device to be started or stopped according to temperature and pressure signals monitored by the temperature detector and the pressure detector so as to extract gas and liquid generated by the heated polluted site, and the gas and the liquid are transmitted through a waste gas conveying pipeline (12).
6. The in-situ thermal desorption structure by electric heating in a polluted field according to claim 5, characterized in that a plurality of inlets are arranged on the side wall of the pipe section of the extraction pipe (13) below the heat insulation layer, and a filling layer (14) is arranged between the pipe wall of the extraction pipe (13) and the wall of the extraction well (3).
7. The electric heating in-situ thermal desorption structure for the polluted field according to claim 2, wherein a thermocouple sensor and a heating pipe (9) are further arranged in the heating well (1), the heating pipe (9) is inserted into the heating well (1), the electric heating rod (4) is inserted into the heating pipe (9), the thermocouple sensor is arranged between the well wall of the heating well (1) and the heating pipe (9), and the controller controls the start and stop of the electric heating rod (4) according to a temperature signal in the heating well (1) monitored by the thermocouple sensor.
8. The in-situ thermal desorption structure by electric heating in a contaminated field according to claim 7, wherein a heat conducting buffer layer (6) is arranged between the heating pipe (9) and the wall of the heating well (1), and a heat insulating and insulating filling material (16) is arranged between the conducting wire (5) and the heat insulating layer.
9. Electrically heated in-situ thermal desorption structure for a contaminated site according to claim 1, further comprising at least one heat conducting well (15), said heat conducting well (15) being parallel to said heating well (1), said heat conducting well (15) being provided between said heating well (1) and said temperature pressure monitoring well (2) and/or between said temperature pressure monitoring well (2) and said extraction well (3).
10. Electrically heated in-situ thermal desorption structure for contaminated sites according to claim 9, characterized in that iron filings and/or gravel are provided in the thermally conductive wells (15).
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