CN115780495A - Pilot plant device and method for simulating field soil vapor extraction-thermal desorption - Google Patents
Pilot plant device and method for simulating field soil vapor extraction-thermal desorption Download PDFInfo
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Abstract
The invention discloses a pilot plant device and a pilot plant method for simulating field soil vapor extraction-thermal desorption, and relates to the field of pilot plant simulation device equipment for soil remediation. The soil column unit of the device comprises a sealed cylinder structure which is formed by an end cover, a splicing shell and a base; a heating rod and an extraction pipe are arranged in the cylinder body along the axial direction; the heating rod, the automatic control system and the computer are sequentially connected, and the extraction pipe is connected with an inlet of the condenser; and a condensate outlet of the condenser is connected with the liquid collector, and a tail gas outlet is sequentially connected with the first mass flow controller, the vacuum pump and the second mass flow controller. The invention can perform pilot-scale simulation on the gas phase extraction-thermal desorption repair process of volatile/semi-volatile organic pollutants in actual field soil, perform real-time online detection on the concentration of pollutants in tail gas, and provide references for the aspects of online monitoring, process optimization, material migration, mass transfer model establishment and the like of the volatile/semi-volatile organic pollutants in subsequent field repair.
Description
Technical Field
The invention relates to the field of soil remediation pilot-scale test simulation device equipment, in particular to a pilot-scale test device and method for simulating field soil vapor extraction-thermal desorption.
Background
In recent years, with the improvement of economic transformation and urban functional layout, many traditional industrial enterprises located in urban areas gradually migrate outside, so that a large number of polluted sites to be repaired urgently are left, the pollutant components in the polluted sites are complex and serious in pollution, and most of the polluted sites left by chemical enterprises contain volatile/semi-volatile organic pollutants. Sites in urban areas after enterprises are moved outside must be repaired before being re-developed and utilized so as to eliminate the health risks of pollutants to human bodies and the environment. The vapor extraction and thermal desorption technology is a common restoration technology for site soil pollution, and can efficiently and quickly remove volatile/semi-volatile organic pollutants in soil.
The phase change of the pollutant (such as liquid phase to gas phase) and the change of the pollutant property (Henry coefficient, solubility, saturated vapor pressure and the like) are involved in the process of gas phase extraction and thermal desorption of the polluted soil, and the change of the physical parameters is beneficial to the migration and mass transfer of the pollutant to the gas phase. The migration and mass transfer processes of pollutants in the gas-phase extraction and thermal desorption processes can be described through pilot-scale simulation, and the pilot-scale simulation result is perfected by combining monitoring data in the actual field repair process, so that the accuracy of pilot-scale simulation is particularly important. The existing pilot plant test has low accuracy in simulation of gas phase extraction and thermal desorption, and a simulation system has great difference with actual conditions, so that the pilot plant test result is difficult to apply to the actual site repair process. The specific problems are as follows: firstly, the actual polluted site is distributed with soil with different textures from the ground surface downwards, the property difference of permeability, water content, soil particle size, organic matter content and the like is large, the fluctuation of underground water level in different time periods is inconsistent, so that the positions of a saturated zone and an unsaturated zone are different, the pilot simulation generally adopts soil with uniform property for simulation, the influence of underground water level change on the simulation process is not considered, and the simulation environment is greatly different from the actual site environment; secondly, the accuracy of monitoring the concentration of volatile/semi-volatile organic pollutants in the gas phase extraction and thermal desorption tail gas is to be improved, and the content of the volatile/semi-volatile organic pollutants in the tail gas is mainly detected by three methods, (1) the pollutants in the tail gas are adsorbed to a solid or dissolved in a liquid phase, and then a target object is separated and detected by methods such as extraction, desorption and the like; (2) Manually taking a certain amount of tail gas at fixed time intervals for detection; (3) And detecting by using an online detector which takes a PID detector and the like as core equipment. The former two detection methods have large workload and poor timeliness, the content of pollutants in the tail gas cannot be monitored online in real time, and the change condition of the concentration of the pollutants in the tail gas in a short time cannot be accurately captured due to overlong sampling intervals, so that the accuracy of a simulation result is possibly reduced; although the third detection method can realize real-time detection, the PID detector has no specificity, can only distinguish a certain class of pollutants, cannot realize qualitative and quantitative analysis on a single pollutant, and in addition, some original volatile components in soil may cause interference on a detection result, so that an error of a simulation result is larger.
Disclosure of Invention
The invention aims to overcome the defects that the accuracy of a pilot test simulation of vapor extraction-thermal desorption remediation of contaminated soil is not high and a simulation system is greatly different from the actual situation in the prior art, and establishes a pilot test device and a method for simulating field soil vapor extraction-thermal desorption, so that the accurate simulation of the actual field environment, the real-time online accurate monitoring of the concentration of volatile/semi-volatile organic pollutants in tail gas and the accurate and controllable simulation process are realized.
The invention adopts the following specific technical scheme:
in a first aspect, the invention provides a pilot plant for simulating field soil vapor extraction-thermal desorption, which comprises a soil column unit; the soil column unit comprises a plurality of splicing shells arranged on a base, the splicing shells are sequentially connected through flanges in the vertical direction, an end cover is sealed at the top of the uppermost splicing shell, and the end cover, the splicing shells and the base jointly form a sealed barrel structure; a temperature sensor and a pressure sensor are arranged on the side wall of each splicing shell; the heating rod and the extraction pipe are arranged in the cylinder body along the axial direction, holes are uniformly formed in the side wall of the extraction pipe, and the bottom of the cylinder body is communicated with the water pipe; the heating rod is connected with a computer through an automatic control system, and the extraction pipe is connected with an inlet of the condenser; a condensate outlet of the condenser is connected with the liquid collector, and a tail gas outlet is sequentially connected with the first mass flow controller, the vacuum pump and the second mass flow controller; the outlet of the second mass flow controller is divided into two paths, one path is communicated with the tail gas adsorption device after passing through the gas chromatograph, the other path is introduced into the gas chromatograph after being sequentially treated by the tail gas purification device and the tail gas adsorption device, and the tail gas is discharged after being detected to reach the standard by the gas chromatograph.
Preferably, the splicing shell is made of stainless steel.
Preferably, the top and the bottom in the barrel are both provided with lining supports, and the lining supports are provided with a plurality of holes for supporting and ventilating the filled soil.
Preferably, the first mass flow controller, the second mass flow controller, the temperature sensor and the pressure sensor are all connected with a computer through an automatic control system.
Preferably, two water pipes are symmetrically arranged relative to the soil column unit and are respectively and vertically fixed on the base; a first electromagnetic valve is arranged at a water inlet at the top of the water pipe, and a water outlet at the bottom of the water pipe is communicated with the liquid discharge tank through a pipeline provided with a second electromagnetic valve; the bottom of the water pipe is communicated with the bottom of the cylinder body through a bent pipe.
Furthermore, a water level gauge is installed in the water pipe, the water level gauge can feed back height information of the water level in the water pipe to a computer in real time, and the computer can control the opening and closing of the first electromagnetic valve through an automatic control system to feed back and adjust the height of the water level in the water pipe.
Preferably, four heating rods are arranged and uniformly distributed at 1/2 of the inner diameter of the cylinder; the extraction pipe is arranged at the center in the cylinder body.
Preferably, four holes are uniformly formed in the same horizontal plane of the side wall of the splicing shell at intervals, namely a temperature sensor mounting hole, a pressure sensor mounting hole, an air vent and a sampling port.
Preferably, each gas pipeline in the device is hermetically connected.
In a second aspect, the invention provides a simulation method of a pilot plant using the simulated field soil vapor extraction-thermal desorption of any one of the first aspects, which specifically comprises the following steps:
connecting a plurality of spliced shells according to the depth of a target field to form a sealed cylinder; filling corresponding soil into the sealed cylinder according to soil with different properties at different depths of a target field, thereby simulating a real field environment; the combined use of a heating rod, a vacuum pump and an extraction pipe is adopted to simulate the gas phase extraction-thermal desorption combined technology; the combination of a vacuum pump and an extraction pipe is used to simulate the vapor extraction technology; adding water into the soil column unit through a water pipe to simulate a multiphase extraction technology, and simulating underground water level change by adjusting the height of the water level in the soil column unit; if water is not introduced into the soil column unit through the water pipe, simulating a vapor extraction technology;
after the contaminated soil is added into the sealed cylinder, compacting the filled contaminated soil appropriately according to the situation of a target site, then sealing the filled contaminated soil, and aging for an appropriate time; starting a vacuum pump to perform extraction operation, extracting and discharging gas generated in the repair process through an extraction pipe, monitoring the concentration of volatile/semi-volatile organic pollutants in the tail gas by a gas chromatograph after passing through a condenser, a first mass flow controller, the vacuum pump and a second mass flow meter, and discharging the gas after the concentration reaches the standard through treatment of a tail gas adsorption device; the other part is treated by a tail gas purification device and a tail gas adsorption device and is discharged after reaching the standard; the condensate generated in the condenser enters a liquid collector and is discharged after harmless treatment; in the whole simulation process, the temperature and the pressure in the sealing cylinder are measured in real time by the temperature sensor, the pressure sensor and the automatic control system and are stored in the computer.
Compared with the prior art, the invention has the following beneficial effects:
1) The cylinder in the earth pillar unit adopts a sectional type structure, so that homogeneous and heterogeneous site environments can be simulated, and the actual heterogeneous soil environment can be restored to the maximum extent by the sectional type cylinder design, so that various complex site soil environments can be simulated.
2) The combination of the water pipe, the electromagnetic valve, the water level meter and the automatic control system can realize the accurate regulation and control of the water level in the cylinder body, simulate the change of the distribution of a saturated zone and an unsaturated zone of soil caused by the change of the water level in an actual field, and also simulate the multiphase extraction process.
3) The combination of the heating rod and the extraction pipe can simulate a single repair technology of vapor extraction and thermal desorption, and can also simulate different combination modes of simultaneous extraction, heating and extraction, simultaneous extraction and heating or simultaneous extraction and heating, and the like, so that the simulation of various repair technologies is realized.
4) The tail gas lug connection of analogue means enters the gas chromatograph that the entrance end has the solenoid valve, can use gas chromatograph to volatilize/semi-volatility organic pollutant concentration in the analogue means tail gas and carry out real-time on-line monitoring, experimental error that has avoided artifical manual gas sampling to lead to, sampling interval overlength, the change scheduling problem of performance/semi-volatility organic pollutant concentration in the unable accurate survey short time in the tail gas to improve the accuracy of simulation result, the efficiency of pollutant monitoring in the tail gas, simultaneously also significantly reduced experimenter's sample work load.
5) 4 heating rods are uniformly distributed on the circular surface at the 1/2 radius position in the cylinder body, so that the heating rate of the soil can be greatly increased, and the temperature distribution of the soil in the stainless steel column is more uniform in the heating process.
6) Temperature sensors, pressure sensors, an automatic control system and a computer which are uniformly distributed on the side wall of the cylinder body can monitor and record temperature and pressure values of soil at different depths in the simulation process in real time, the soil heating temperature can be controlled through the automatic control system, the computer and the heating rod, and the whole simulation process is controllable.
7) The simulation device can obviously reduce the workload of experimenters and improve the accuracy of simulation results.
Drawings
FIG. 1 is a schematic structural diagram (a) and a top view (b) of a column unit in the apparatus of the present invention;
FIG. 2 is a schematic view of the apparatus of the present invention;
FIG. 3 isbase:Sub>A schematic cross-sectional view (base:Sub>A) andbase:Sub>A schematic cross-sectional view A-A (b) of the earth pillar unit in the apparatus of the present invention;
FIG. 4 is a schematic cross-sectional view (a) and a schematic cross-sectional view (B) of the earth pillar unit in the apparatus of the present invention;
the reference numbers in the figures are: 1. a soil column unit; 101. splicing the shells; 102. a heating rod; 103. an extraction pipe; 104. a water pipe; 105. a base; 106-1, a first electromagnetic valve; 106-2, a second electromagnetic valve; 108. a water level gauge; 109. a flange; 110. a temperature sensor; 111. a pressure sensor; 112. a vent; 113. a sampling port; 114. a lining support; 2. a liquid discharge tank; 3. a condenser; 4-1, a first mass flow controller; 4-2, a second mass flow controller; 5. a vacuum pump; 6. a liquid collector; 7. a tail gas purification device; 8. a tail gas adsorption device; 9. a gas chromatograph; 10. a computer; 11. an automatic control system.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
As shown in fig. 2, the device provided by the invention is a pilot plant for simulating field soil vapor extraction-thermal desorption, and is mainly used as a pilot plant simulation device to simulate a field soil remediation process under multiple working conditions of vapor extraction-thermal desorption. The device mainly comprises a soil column unit 1, an automatic control system 11, a computer 10, a condenser 3, a vacuum pump 5, a gas chromatograph 9, a tail gas purification device 7 and a tail gas adsorption device 8, and the structure and the connection mode of all the components are specifically explained below.
As shown in fig. 1, 3 and 4, is a schematic structural diagram of the earth pillar unit 1. In the device, the soil column unit 1 is a main body device, and when the device is actually used, corresponding soil is filled in the shell to form the soil column according to different properties (texture, water content, pollutant conditions and the like) of different depths of an actual field, so that a real field environment is simulated. The earth pillar unit 1 comprises a plurality of splicing shells 101 installed on a base 105, each splicing shell 101 is connected through a flange 109 in sequence along the vertical direction, an end cover is sealed at the top of the splicing shell 101 located at the uppermost position, and the end cover, the splicing shells 101 and the base 105 jointly form a sealed cylinder structure. Each splice housing 101 side wall is provided with a temperature sensor 110 and a pressure sensor 111. The heating device is characterized in that the cylinder body is filled with soil, a heating rod 102 and an extraction pipe 103 are axially arranged in the cylinder body, holes are uniformly formed in the side wall of the extraction pipe 103, and the bottom of the cylinder body is communicated with a water pipe 104.
In practical application, the number of the spliced shells 101 can be selected according to practical conditions, and then the height of the cylinder can be adjusted to adapt to different simulation environments. Specifically, according to the vertical distribution characteristics of the soil with different textures in the actual field, the contaminated soil with different textures is filled in the cylinder, the filling depth is consistent with the distribution depth of the soil with the different textures in the actual field, and the length of each section of the spliced shell 101 in the cylinder is consistent with the distribution depth of the soil with the corresponding texture. In this embodiment, concatenation casing 101 can adopt stainless steel, and top and bottom all are equipped with inside lining support 114 in the barrel, and inside lining support 114's lateral wall and bottom evenly distributed air vent mainly used support and fill soil and infiltration and ventilate.
In the device, the heating rod 102 is connected with the automatic control system 11, and the automatic control system 11 is connected with the computer 10, so that the heating temperature in the running process can be controlled. The extraction pipe 103 is connected to the inlet of the condenser 3. A condensate outlet of the condenser 3 is connected with a liquid collector 6, and a tail gas outlet is sequentially connected with a first mass flow controller 4-1, a vacuum pump 5 and a second mass flow controller 4-2. In actual use, the first mass flow controller 4-1 is used for controlling the extraction flow of the gas in the cylinder of the column unit, and the second mass flow controller 4-2 is used for controlling the flow of the gas entering the gas chromatograph 9. The outlet of the second mass flow controller 4-2 is divided into two paths, one path is communicated with the tail gas adsorption device 8 after passing through the gas chromatograph 9, the other path is introduced into the gas chromatograph 9 after being sequentially treated by the tail gas purification device 7 and the tail gas adsorption device 8, and the tail gas is discharged after being detected by the gas chromatograph 9 to reach the standard.
In practical use, tail gas extracted by the vacuum pump 5 passes through the condenser 3, the first mass flow controller 4-1, the vacuum pump 5, the second mass flow controller 4-2, the gas chromatograph 9, the tail gas purification device 7 and the tail gas adsorption device 8 in sequence and is finally discharged up to the standard; the condensed water generated in the condenser 3 enters the liquid collector 6; a first mass flow controller 4-1 connected behind the condenser 3 controls the gas extraction flow in the cylinder, and a second mass flow controller 4-2 connected behind the vacuum pump controls the gas flow entering the gas chromatograph 9; the gas in the whole system is hermetically connected by a gas pipeline.
In this embodiment, two water pipes 104 are symmetrically arranged relative to the earth pillar unit 1, and are vertically fixed on the base 105 respectively. The top water inlet of the water pipe 104 is provided with a first electromagnetic valve 106-1, and the bottom water outlet is communicated with the liquid discharge tank 2 through a pipeline provided with a second electromagnetic valve 106-2. The bottom of the water pipe 104 is communicated with the bottom of the barrel through an elbow pipe, and because the liquid level in the water pipe is the same as the liquid level in the barrel, the simulated underground water level in the barrel can be adjusted by adjusting the height of the liquid level in the water pipe 104. The water pipe 104 is provided with a water level gauge 108, the water level gauge 108 can feed back the height information of the water level in the water pipe 104 to the computer 10 in real time, and the computer 10 can control the opening and closing of the first electromagnetic valve 106-1 through the automatic control system 11 to feed back and adjust the height of the water level in the water pipe 104, so that the height of the water level in the cylinder is accurately controlled, and the influence of the change of the underground water level in an actual field on gas phase extraction-thermal desorption is simulated.
Specifically, a first electromagnetic valve 106-1 at the upper end of a water pipe 104 is connected with tap water, a second electromagnetic valve 106-2 at the lower end of the water pipe 104 is connected with a liquid discharge tank 2, another pipeline at the lower end of the water pipe 104 is communicated with the bottom end of the cylinder body to form U-shaped communication, the tap water enters the water pipe 104 from the first electromagnetic valve 106-1 at the upper end of the water pipe 104 and enters the column of the cylinder body through the U-shaped communication, and the water in the water pipe 104 can also be discharged out of the water pipe 104 and enters the liquid discharge tank 2 through the second electromagnetic valve 106-2 at the lower end of the water pipe 104.
In this embodiment, four heating rods 102 are uniformly distributed at 1/2 of the inner diameter of the cylinder, and the arrangement of 4 heating rods 102 can realize rapid and uniform temperature rise of the soil. The extraction tube 103 is centrally disposed within the barrel. At the same horizontal plane of the side wall of each splicing shell 101, four holes are uniformly arranged at intervals, namely a temperature sensor mounting hole, a pressure sensor mounting hole, an air vent 112 and a sampling port 113.
In order to realize the adjustment and feedback of each parameter of the device, the heating rod 102 can be connected with the automatic control system 11; a temperature sensor 110 and a pressure sensor 111 are arranged on the side wall of the splicing shell 101; the electromagnetic valve 106, the water level gauge 108, the temperature sensor 110, the pressure sensor 111, the first mass flow controller 4-1 and the second mass flow controller 4-2 are connected with the automatic control system 11, and the automatic control system 11 and the computer 10 can monitor and adjust gas flow, gas pressure, heating temperature, water level height, electromagnetic valve switch and the like in the whole process in real time through self-adaptive feedback adjustment, so that the whole simulation process can be controlled.
The simulation method using the device comprises the following specific steps:
according to the depth of the target site, a plurality of spliced shells 101 are connected to form a sealed cylinder, and negative pressure inside the sealed cylinder is provided by a vacuum pump 5. And filling corresponding polluted soil into the sealed cylinder according to the soil with different properties at different depths of the target site, thereby simulating a real site environment. Water flow is introduced into the soil column unit 1 through the water pipe 104, underground water level change is simulated by adjusting the water level in the soil column unit 1, and a multiphase extraction process is simulated. The combined use of the heating rod 102, the vacuum pump 5, and the extraction tube 103 simulates a vapor extraction-thermal desorption coupled technique, while the combination of the vacuum pump 5 and the extraction tube 103 simulates a vapor extraction technique. Starting a vacuum pump to start repairing, extracting and discharging gas generated in the repairing process through an extraction pipe 103, introducing extracted tail gas into a condenser 3 through the extraction pipe 103, introducing condensed liquid generated after condensation into a liquid collector 6, sequentially passing the condensed tail gas through a mass flow controller 4-1, a vacuum pump 5 and a mass flow controller 4-2, controlling the extraction flow of the gas in a cylinder by the mass flow controller 4-1, and controlling the gas flow entering a gas chromatograph 9 by the mass flow controller 4-2. One part of the tail gas passing through the mass flow controller 4-2 is detected by a gas chromatograph 9 and then enters a tail gas adsorption device 8, the other part of the tail gas passes through a tail gas purification device 7 and the tail gas adsorption device 8 in sequence, and the tail gas is treated and then is discharged after reaching the standard by the detection of the gas chromatograph 9; the gas chromatograph 9 is provided with an electromagnetic valve at the sample inlet, so that sample introduction can be performed automatically at intervals, and the gas chromatograph 9 can realize real-time online monitoring and recording of the concentration of volatile/semi-volatile organic pollutants in the tail gas. In the whole simulation process, the soil temperature and pressure in the stainless steel soil column 101 are measured in real time by the temperature sensor 110, the pressure sensor 111 and the automatic control system 11 and stored in the computer 10.
The invention can perform pilot-scale simulation on the gas phase extraction-thermal desorption repair process of volatile/semi-volatile organic pollution in the actual field soil, perform real-time online detection on the concentration of the pollutant in the tail gas, and provide references for the aspects of online monitoring, process optimization, material migration, mass transfer model establishment and the like of the volatile pollutant in the subsequent field repair.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (10)
1. A pilot plant for simulating field soil vapor extraction-thermal desorption is characterized by comprising a soil column unit (1); the soil column unit (1) comprises a plurality of splicing shells (101) arranged on a base (105), the splicing shells (101) are connected in sequence through flanges (109) along the vertical direction, an end cover is sealed at the top of the uppermost splicing shell (101), and the end cover, the splicing shells (101) and the base (105) jointly form a sealed cylinder structure; the side wall of each splicing shell (101) is provided with a temperature sensor (110) and a pressure sensor (111); the heating device is characterized in that the cylinder body is filled with soil, a heating rod (102) and an extraction pipe (103) are axially arranged in the cylinder body, holes are uniformly formed in the side wall of the extraction pipe (103), and the bottom of the cylinder body is communicated with a water pipe (104); the heating rod (102) is connected with an automatic control system (11), the automatic control system (11) is connected with a computer (10), and the extraction pipe (103) is connected with an inlet of the condenser (3); a condensate outlet of the condenser (3) is connected with a liquid collector (6), and a tail gas outlet is sequentially connected with a first mass flow controller (4-1), a vacuum pump (5) and a second mass flow controller (4-2); the outlet of the second mass flow controller (4-2) is divided into two paths, one path is communicated with the tail gas adsorption device (8) after passing through the gas chromatograph (9), the other path is treated by the tail gas purification device (7) and the tail gas adsorption device (8) in sequence and then is introduced into the gas chromatograph (9), and the tail gas is discharged after the detection of the gas chromatograph (9) reaches the standard.
2. The pilot plant for simulating field soil vapor extraction-thermal desorption according to claim 1, wherein the spliced shell (101) is made of stainless steel.
3. The pilot plant for simulating field soil vapor extraction-thermal desorption according to claim 1, wherein the top and the bottom of the cylinder are provided with lining supports (114), and the lining supports (114) are provided with a plurality of holes for supporting and ventilating the filled soil.
4. The pilot plant for simulating field soil vapor extraction-thermal desorption according to claim 1, wherein the first mass flow controller (4-1), the second mass flow controller (4-2), the temperature sensor (110) and the pressure sensor (111) are all connected with an automatic control system (11), and the automatic control system (11) is connected with the computer (10).
5. The pilot plant for simulating field soil vapor extraction-thermal desorption according to claim 1, wherein two water pipes (104) are symmetrically arranged relative to the soil column unit (1) and are vertically fixed on the base (105) respectively; a first electromagnetic valve (106-1) is arranged at a water inlet at the top of the water pipe (104), and a water outlet at the bottom is communicated with the liquid discharge tank (2) through a pipeline provided with a second electromagnetic valve (106-2); the bottom of the water pipe (104) is communicated with the bottom of the cylinder body through an elbow pipe.
6. The pilot plant for simulating field soil vapor extraction-thermal desorption according to claim 5, wherein a water level gauge (108) is installed in the water pipe (104), the water level gauge (108) can feed back the height information of the water level in the water pipe (104) to the computer (10) in real time, and the computer (10) can control the opening and closing of the first electromagnetic valve (106-1) through the automatic control system (11) to feed back and adjust the height of the water level in the water pipe (104).
7. The pilot plant for simulating field soil vapor extraction-thermal desorption as claimed in claim 1, wherein four heating rods (102) are uniformly distributed at 1/2 of the inner diameter of the cylinder; the extraction pipe (103) is arranged at the center in the cylinder body.
8. The pilot plant for simulating field soil vapor extraction-thermal desorption as claimed in claim 1, wherein four holes are uniformly arranged at intervals at the same horizontal plane on the side wall of each splicing housing (101), and are respectively a temperature sensor mounting hole, a pressure sensor mounting hole, a vent (112) and a sampling port (113).
9. The pilot plant for simulating field soil vapor extraction-thermal desorption according to claim 1, wherein each gas pipeline in the pilot plant is hermetically connected.
10. A simulation method using a pilot plant for simulating field soil vapor extraction-thermal desorption according to any one of claims 1 to 9, which is characterized by comprising the following steps:
according to the depth of a target field, a plurality of splicing shells (101) are connected to form a sealing cylinder; filling corresponding soil into the sealed cylinder according to soil with different properties at different depths of a target field, thereby simulating a real field environment; the combined use of a heating rod (102), a vacuum pump (5) and an extraction pipe (103) is adopted to simulate the gas phase extraction-thermal desorption combined technology; the combination of a vacuum pump (5) and an extraction pipe (103) is used to simulate the vapor extraction technology; adding water into the soil column unit (1) through a water pipe (104) to simulate a multiphase extraction technology, and simulating underground water level change by adjusting the height of the water level in the soil column unit (1); if water is not introduced into the soil column unit (1) through the water pipe (104), simulating a vapor extraction technology;
after the contaminated soil is added into the sealed cylinder, compacting the filled contaminated soil appropriately according to the situation of a target site, then sealing the filled contaminated soil, and aging for an appropriate time; starting a vacuum pump (5) for extraction operation, extracting and discharging gas generated in the repairing process through an extraction pipe (103), allowing a part of the gas to enter a gas chromatograph (9) to monitor the concentration of volatile/semi-volatile organic pollutants in tail gas after passing through a condenser (3), a first mass flow controller (4-1), the vacuum pump (5) and a second mass flow meter (4-2), and discharging the gas after the concentration reaches the standard after being treated by a tail gas adsorption device (8); the other part is treated by a tail gas purification device (7) and a tail gas adsorption device (8) and is discharged after reaching the standard; condensate generated in the condenser (3) enters a liquid collector (6) and is discharged after harmless treatment; the temperature and the pressure in the sealing cylinder body in the whole simulation process are measured in real time by the temperature sensor (110), the pressure sensor (111) and the automatic control system (11) and stored in the computer (10).
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