CN115656244A - Experimental device and experimental method for thermal desorption of polluted soil - Google Patents
Experimental device and experimental method for thermal desorption of polluted soil Download PDFInfo
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- CN115656244A CN115656244A CN202211297661.6A CN202211297661A CN115656244A CN 115656244 A CN115656244 A CN 115656244A CN 202211297661 A CN202211297661 A CN 202211297661A CN 115656244 A CN115656244 A CN 115656244A
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Abstract
The utility model relates to an experimental apparatus and an experimental method for contaminated soil thermal desorption, including the experiment box, the experiment box includes box upper cover, heating pipe, extracts and gets the pipe, steam generator, power station, electric method detection instrument, vacuum pump and temperature controller, the box upper cover is opened and is equipped with the through-hole of array arrangement, the electric method detection instrument includes high density electric method host computer and a plurality of electrode, a plurality of electrode pass electrode arrangement hole and can contact detection soil, high density electric method host computer is used for detecting the resistivity section of each part of detection soil. The method and the device are beneficial to inversion to obtain the diffusion rule of the pollutants.
Description
Technical Field
The application relates to the field of road detection, in particular to an experimental device and an experimental method for thermal desorption of polluted soil.
Background
In the aspect of NAPLs polluted soil remediation, the in-situ thermal desorption remediation technology has small disturbance to the surrounding soil environment due to no need of excavation and earthwork transportation, and the pollutants are thoroughly removed, so that the deep soil can be repaired and gradually popularized. However, the problems of high energy consumption, immature technology, difficult repair of aeration zone, uneven heating and the like restrict the popularization of the repair method and the utilization of land resources, and the transverse heating in-situ thermal desorption technology for efficiently and economically repairing the soil polluted by non-aqueous phase liquids (NAPLs) is developed in order to optimize the thermal desorption heating method, improve the in-situ thermal desorption additional thermal efficiency, reduce the energy consumption and realize the method.
However, the existing in-situ thermal conduction desorption technology is a vertical heating well and a pumping and extracting well, although the technology has the advantage of efficiently removing pollutants in deep soil without excavation, the heat transfer in the vertical direction is uneven in the horizontal direction and the heating effect is poor due to the layering of an aeration zone, the potential flow between layers, the heat distribution is uneven, the heat transfer performance in the layer is poor, the soil is more than multiple layers of layers, and the physical property difference between the layers is large, so that the heat is not uniformly transferred in the horizontal direction during vertical heating, the high temperature and long-time heating are needed to achieve a better effect, the energy consumption is large, and the heat transfer, the temperature field distribution, the heating parameter selection and the polluted soil restoration rule are unclear in the actual application of a thermal desorption system, and a specific theoretical guidance and efficient and economic research method is lacked. Therefore, an experimental device for thermal desorption of contaminated soil is urgently needed.
Disclosure of Invention
The application provides an experimental device and an experimental method for thermal desorption of polluted soil, which can acquire a resistivity profile of the soil through a high-density electrical method instrument and an electrode so as to invert the diffusion rule of pollutants.
The utility model provides an experimental apparatus for be used for polluting native thermal desorption, includes the experiment box, an experimental apparatus for be used for polluting native thermal desorption still includes: the device comprises a heating pipe, an extraction pipe, a steam generator, a power station, an electrical method detector, a vacuum pump and a temperature controller; the experimental box body is used for containing and detecting soil, device holes which are uniformly distributed are formed in one side wall of the experimental box body, the heating pipe and the extraction pipe are inserted into the experimental box body through the device holes, the heating pipe is communicated with the steam generator through a pipeline, the power station is respectively electrically connected with the vacuum pump, the steam generator and the temperature controller so as to supply power to the heating pipe, the steam generator, the vacuum pump and the temperature controller, the extraction pipe is communicated with the vacuum pump, the steam generator provides high-pressure steam for the heating pipe, the temperature controller is electrically connected with the heating pipe and the steam generator and is used for controlling the heating pipe and the steam generator, through holes which are arranged in an array mode are formed in the upper cover of the box body of the experimental box body, the electrical method detecting instrument comprises a high-density electrical method host and a plurality of electrodes, the high-density electrical method host is electrically connected with the plurality of electrodes, the plurality of electrodes penetrate through the through holes and are located in the experimental box body, and the electrical method detecting instrument is used for detecting the section of each part of the detected soil.
Through adopting above-mentioned technical scheme, get the pipe through wearing to establish the heating pipe and extracting in different device holes and can control heating pipe temperature and steam/hot air pressure that are in the difference, produce high-pressure gas in order to dredge the soil hole through setting up steam generator, can enlarge soil horizon and hot air area of contact, promote desorption pollutant circulation, get the intertube formation microcirculation at the heating pipe with the extraction, improve heat conduction heating remediation efficiency, also can compensate the problem that the heating pipe heat conduction efficiency that leads to because moisture reduces in the heat-conduction is low simultaneously, guarantee heat conduction efficiency, gather the resistivity section that detects soil through setting up the electrical method detection instrument, and then the diffusion law of inversion pollutant.
Optionally, the heating pipes and the extraction pipes are alternately arranged in the experimental box body.
By adopting the technical scheme, the heating pipes and the extraction pipes are alternately arranged, so that the temperature loss of steam/hot air around the extraction pipes in the soil heat desorption can be avoided as much as possible, the extraction efficiency of the extraction pipes is improved, and the heat conduction heating repair efficiency is effectively improved.
Optionally, the experimental apparatus further includes a plurality of sensors, the sensors are connected in series through a wire, and the sensors are disposed on the axis of the through hole.
Through adopting above-mentioned technical scheme, equidistant sensor that sets up in experimental apparatus to the sample data of each part of even detection and detection soil, and then the degree of accuracy of the diffusion law inversion of promotion pollutant.
Optionally, the sensor is an integrated sensor capable of collecting soil temperature, humidity and air pressure.
Through adopting above-mentioned technical scheme, soil temperature, humidity and atmospheric pressure can be gathered simultaneously to the sensor.
Optionally, the experimental apparatus further comprises a multifunctional inspection instrument, the multifunctional inspection instrument is electrically connected with the sensors, and the multifunctional inspection instrument is used for displaying the readings of the sensors in a centralized manner.
Through adopting above-mentioned technical scheme, set up multi-functional appearance of patrolling and examining so that the user reads each item parameter of sensor fast, can promote the treatment effeciency simultaneously.
Optionally, the experimental apparatus further comprises a peristaltic pump, the peristaltic pump passes through the through hole located in the center of the upper cover of the box body, and the peristaltic pump is used for detecting the dripping pollutants in the soil and adjusting the injection rate of the pollutants so as to simulate the leakage condition of the pollutants.
Through adopting above-mentioned technical scheme, use the peristaltic pump to the condition that appears the pollutant seepage in the detection soil, the speed of regulation and control peristaltic pump injection pollutant simultaneously to the seepage condition of simulation multiple different pollutants can effectively promote to the hourglass pollutant in the simulation soil.
Optionally, a pipeline connected between the heating pipe and the steam generator is provided with a first flow meter, the first flow meter is used for displaying a steam injection flow of the steam generator, a pipeline connected between the extraction pipe and the vacuum pump is provided with a condensation pipe and a second flow meter, the condensation pipe is used for collecting pollutants and determining a pollutant repair amount, and the second flow meter is used for displaying an extraction flow of the vacuum pump.
Through adopting above-mentioned technical scheme, set up first flowmeter and second flowmeter and help reading steam generator's notes vapour flow and the extraction flow of vacuum pump to can annotate vapour flow and extract the flow through the regulation and control difference, and then regulate and control heat conduction heating repair efficiency, set up the condenser pipe in order to collect the pollutant and survey pollutant repair volume, can more accurately acquire pollutant repair efficiency according to pollutant repair volume.
Optionally, the power supply station further includes an electric energy meter, and the electric energy meter is configured to detect common energy consumption of the steam generator, the heating pipe, and the vacuum pump under different arrangement conditions of the extraction pipe and the heating pipe.
By adopting the technical scheme, the electric energy meter is arranged to acquire the common energy consumption of the steam generator, the heating pipe and the vacuum pump under different arrangement conditions, and meanwhile, the optimal heating parameters are found by recording the temperature, the air pressure, the humidity change condition, the temperature field distribution condition and the energy consumption condition of each combination acquired by each sensor in the soil.
An experimental method for thermal desorption of contaminated soil, the method comprising:
providing the experiment box body;
filling the test chamber with the test soil such that the test soil contacts the electrode; starting the power station and the high-density electric method host to work, enabling the heating pipe to heat the detection soil, and starting the vacuum pump to enable the extraction pipe to extract air from the detection soil within a preset time;
detecting the substance components in the extraction tube; and
and according to the material components and the resistivity profile of the detected soil collected by the high-density electrical method instrument, inverting to obtain the diffusion rule of the pollutants, and acquiring the optimal thermal desorption parameter setting of the detected soil according to the diffusion rule of the pollutants.
By adopting the technical scheme, the high-density electrical method host and the high-density electrical method electrodes are arranged to detect the diffusion rule in the polluted soil, whether various pollutant components exist in the polluted soil is judged by detecting NAPLs pollutant components in the polluted soil, whether the diffusion rule in the corresponding standard polluted soil conforms to the standard is further judged, and meanwhile, the optimal thermal desorption parameter setting can be obtained according to the relevant parameters obtained by the experimental device.
Optionally, before filling the test box with the detection soil, filling standard soil without NAPLs, wherein the detection soil is artificially prepared NAPLs-contaminated soil;
under the condition of detecting the standard soil, acquiring the material components in the extraction pipe and the standard parameters of the resistivity profile; and
and comparing the standard parameters of the material composition and the resistivity profile in the extraction pipe under the condition of detecting the standard soil with the experimental parameters of the material composition and the resistivity profile in the extraction pipe under the condition of detecting the soil.
Through adopting above-mentioned technical scheme, realize detecting the restoration back of soil through thermal desorption, through the standard soil that will not contain the NAPLs pollutant with detect soil and carry out the experiment parameter contrast, and then evaluate the restoration condition of normal position thermal desorption transverse heating.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the heating pipes are arranged in different device holes in a penetrating mode to control the temperature of the heating pipes at different depths and the pressure of generated steam/hot air, meanwhile, the extraction pipes are arranged to absorb the steam/hot air carrying pollutants, the steam generator is arranged to generate high-pressure gas to dredge soil pores, the contact area of a soil layer and the hot air can be enlarged, the circulation of desorbed pollutants is promoted, micro circulation is formed between the heating pipes and the extraction pipes, the heat conduction heating repair efficiency is improved, the problem of low heat conduction efficiency of the heating pipes caused by moisture reduction in heat conduction can be solved, the heat conduction efficiency is guaranteed, the resistivity profile of the soil is collected and detected by the electric detection instrument, and the diffusion rule of the pollutants is inverted;
2. the in-situ thermal desorption transverse heating of the polluted soil of various soil qualities and stratums can be researched, and the temperature field distribution condition, the pollutant diffusion condition, the energy consumption condition and the pollutant remediation efficiency of the soil under the conditions of different pipe distribution modes, different heating temperatures, different extraction flow rates, different pollutant concentrations, different steam injection flow rates, different extraction and heating positions can be researched.
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus for thermal desorption of contaminated soil according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a horizontal cross-sectional arrangement of sensors provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of a sensor depth profile arrangement provided by an embodiment of the present application;
FIG. 4 is a schematic structural diagram of an experimental apparatus equipped with a peristaltic pump according to an embodiment of the present disclosure;
fig. 5 is a flowchart of an experimental method for thermal desorption of contaminated soil according to an embodiment of the present application.
Description of reference numerals: 1. an experiment box body; 101. an upper cover of the box body; 102. a device hole; 103. a through hole; 2. heating a tube; 3. extracting the tube; 4. a steam generator; 5. a power supply station; 6. an electrical method detector; 601. a high-density electrical method host; 602. an electrode; 7. a vacuum pump; 8. a temperature controller; 9. a sensor; 10. a multifunctional patrol instrument; 11. a peristaltic pump; 12. a first flow meter; 13. a second flow meter; 14. a condenser tube; 15. an electric energy meter.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
Before describing embodiments of the present invention, some terms referred to in the embodiments of the present invention will be defined and explained.
Contaminants of NAPLs: the NAPLs pollutants are volatile or semi-volatile organic fluids, such as petroleum pollutants of diesel oil, gasoline and the like, or benzene and chlorinated hydrocarbons.
Temperature field: like the gravitational field, the velocity field, etc., the field in which the temperature exists physically is called the temperature field, which is a general term for the temperature distribution at each point in the object at each moment.
The embodiment of the application discloses an experimental apparatus for pollute native thermal desorption, including experiment box 1, heating pipe 2, take out and draw tub 3, steam generator 4, power station 5, electric method detection instrument 6, vacuum pump 7 and temperature controller 8.
The experiment box body 1 is used for containing detection soil, and device holes 102 which are uniformly distributed are formed in one side wall of the experiment box body 1. In one possible example, referring to fig. 1, a 0.7m × 0.7m × 0.5m tank may be selected as the experimental tank 1. The experiment box body 1 is a transparent box body. In one example, the experimental box 1 is made of transparent high temperature resistant material, wherein the material can be any one of Polycarbonate (PC), polyethylene terephthalate (PBT), polyethylene naphthalate (PEN), copolyester (PETG) and polyimide resin, and the soil and pollutant distribution can be observed conveniently.
The distance between the device holes 102 in the horizontal and vertical directions is 0.1m, that is, 20 device holes 102 arranged in an array are formed in the side wall of the experimental box 1.
Through holes 103 are formed in a box body upper cover 101 of the experiment box body 1, the distance between the adjacent through holes 103 in the same row is set to be 0.1m, and the distance between the front through hole 103 and the rear through hole 103 is set to be 0.2m. The interval between the device holes 102 and the interval between the through holes 103 can be freely set according to experimental needs.
The heating pipe 2 and the extraction pipe 3 are inserted into the experiment box body 1 through the device hole 102.
In this embodiment, the heating pipes 2 and the extraction pipes 3 are alternately arranged in the test chamber 1. The heating pipes 2 and the extraction pipes 3 are alternately arranged, so that the temperature loss of steam/hot air around the extraction pipes 3 in soil heat desorption can be avoided as much as possible, the extraction efficiency of the extraction pipes 3 is improved, and the heat conduction heating repair efficiency is effectively improved.
In one example, the heating pipes 2 and the extraction pipes 3 are horizontally staggered in the device holes 102 according to the condition of detected soil, so that single heating and single extraction of the heating section can be realized; heating a single piece, and extracting a plurality of pieces; heating a plurality of the raw materials, and extracting a single raw material; the number and the position of the heating pipes 2 and the extraction pipes 3 can be freely combined. Meanwhile, the unused device holes 102 are sealed to realize sealing, so that the hot air or hot steam output by the heating pipe 2 and NAPLs-carrying pollutants extracted by the extraction pipe 3 are sealed in the experiment box body 1, and the accuracy of experiment data acquisition is improved. The collected data may be temperature, humidity, resistivity, etc.
In an example, heating pipe 2 is bilayer structure, the inlayer pipe is provided with the resistance wire, the air vent has been seted up to the outer pipe, heating pipe 2 both can be to blowing hot-air or hot steam all around, also can detect soil through the heating of thermal resistance wire, simultaneously through wear to establish heating pipe 2 and extract in different device holes 102 and get 2 temperature of heating pipe and steam/hot air pressure that pipe 3 can control to be in the different degree of depth of drawing, form the microcirculation between heating pipe 2 and extraction pipe 3 through setting up, improve heat conduction heating repair efficiency, also can compensate the problem that 2 heat conduction efficiency of heating pipe low because moisture reduces in the heat-conduction simultaneously, guarantee heat conduction efficiency.
The heating pipe 2 is electrically connected with a temperature controller 8, and the temperature controller 8 controls the heating temperature of the heating pipe 2. The heating pipe 2 is communicated with the steam generator 4 through a pipeline. The steam generator 4 is used for generating high-pressure gas to dredge soil pores, so that the contact area of a soil layer and hot air can be enlarged, and the circulation of desorption pollutants is promoted.
The power supply station 5 is respectively and electrically connected with the vacuum pump 7, the steam generator 4 and the temperature controller 8 to supply power to the heating pipe 2, the steam generator 4, the vacuum pump 7 and the temperature controller 8, the extraction pipe 3 is connected with the vacuum pump 7 through a pipeline, the steam generator 4 provides high-pressure steam for the heating pipe 2, the temperature controller 8 is used for controlling the heating pipe 2 and the steam generator 4,
the electrical method detector 6 is used for collecting the resistivity profile of the detected soil, wherein the high-density electrical method detector transmits an artificially established stable current field into the detected soil to monitor the change of the artificially established stable current field, so as to research the electrical property change of the underground medium. The NAPLs pollutants have high resistance, are high resistance bodies relative to the detection soil, can be detected by a high-density electrical method instrument, and can reflect the displacement size, diffusion shape, movement direction and movement speed of the NAPLs pollutants in the soil through the high-density electrical method instrument so as to reverse the diffusion rule of the NAPLs pollutants. The inversion mode can be iterative inversion, optimized inversion, nonlinear inversion and other inversion modes to obtain the diffusion rule of the pollutants in the NAPLs. In this embodiment, the electrical method detecting instrument 6 includes a high-density electrical method host 601 and a plurality of electrodes 602, the plurality of electrodes 602 are located in the experiment box 1 through the through holes 103 so that the electrodes 602 can contact the soil to be detected, and the high-density electrical method host 601 is used for detecting the resistivity profile of each part of the soil to be detected. The uniformly arranged through holes 103 can ensure that the electrodes 602 are uniformly arranged, so that the high-density electrical method host 601 can uniformly measure and detect the resistivity profile of the soil through the electrodes 602.
The through hole 103 needs to be sealed after the electrode 602 is inserted into the detection soil, so that NAPLs pollutants are prevented from diffusing out of the experimental box body 1 as much as possible, and the accuracy of data acquisition is improved. Wherein the acquired data may be a resistivity profile.
In a possible example, the experimental device adjusts the blowing flow, the pumping flow and the heating temperature by adjusting the power of the steam generator 4, the vacuum pump 7 and the heating pipe 2, so as to influence the pollutant diffusion law, and simultaneously, the blowing position, the pumping position, the heating combination and the pumping combination can be adjusted by adjusting the positions and the numbers of the heating pipe 2 and the pumping pipe 3 so as to influence the pollutant diffusion law. Wherein, the heating combination is the number of the heating pipes 2, and the extraction combination is the number of the extraction pipes 3.
In this embodiment, the experimental apparatus further includes a plurality of sensors 9, the sensors 9 are connected in series through a wire, the sensors 9 are disposed on the axis of the through hole 103, and the sensors 9 are disposed in the detection soil at equal intervals.
In an example, as shown in fig. 2 and 3, the sensors 9 are disposed in the extending direction of the heating pipe 2 and the extraction pipe 3, and the spacing of the sensors 9 in the lateral and longitudinal directions is uniform, and the spacing between the sensors 9 may be set to 0.1m. The distance between the sensors 9 can also be adjusted simultaneously when adjusting the device holes 102 and the through holes 103. For example, 80 sensors 9 are distributed in the experiment housing 1, 5 sensors 9 are arranged horizontally and 4 sensors 9 are arranged vertically in the horizontal section of the experiment housing 1, and 4 sensors 9 are arranged in each row in the depth section of the experiment housing 1, corresponding to the positions of the device holes 102 and the through holes 103, respectively.
In this embodiment, the heating pipe 2, the extraction pipe 3, the electrode 602, and the sensor 9 are arranged. The sensor 9 is an integrated sensor capable of collecting soil temperature, humidity and air pressure. For example, the sensor 9 is an intelligent passive sensor for monitoring soil temperature, air pressure and humidity.
In one possible example, an experimental apparatus for thermal desorption of contaminated soil can be used to study the temperature field and the pressure field of non-contaminated soil. The positions of the heating pipe 2 and the extraction pipe 3 are adjusted firstly, the power of an air compressor, a vacuum pump 7 and a thermal resistance wire is respectively adjusted after the power is switched on, the initial values of the temperature, the humidity and the pollutant concentration of soil at various depths are monitored, the temperature field distribution condition of the temperature, the air pressure and the humidity change condition of various monitoring points in the soil and the energy consumption condition of each combination are recorded. And finding the optimal heating parameters, and replacing the soil type to research the optimal heating parameters of different soil types. The above-mentioned optimal heating parameters can be obtained by an inversion algorithm.
In one possible example, the experimental device for thermal desorption of contaminated soil can be used for studying the influence of the contaminants on the temperature field and the diffusion law of the contaminants. The method comprises the steps of selecting contaminated soil with diesel oil as a representative NAPLS pollutant, firstly adjusting the positions of a heating pipe 2 and a pumping pipe 3, respectively adjusting the power of an air compressor, a vacuum pump 7 and a thermal resistance wire after electrification, recording the soil temperature, air pressure, humidity, energy consumption and the change rule of the pollutant in a condenser pipe 14 in an experimental box, analyzing the distribution rule of the pollutant in the soil through a high-density electrical method instrument, researching the diffusion rule of the pollutant, comparing the temperature field of each heating combination of the non-contaminated soil, and researching the influence of the pollutant on the temperature field. And finally, the optimal thermal desorption additional thermal parameter can be obtained by combining the pollutant remediation efficiency and the energy consumption. And the polluted soil with different pollutant concentrations can be replaced, and the influence of different pollutant concentrations on a temperature field and the restoration efficiency can be researched. The distribution rule of the pollutants, the diffusion rule of the pollutants, the influence of the pollutants on the temperature field, the optimal thermal desorption heating parameters and the influence of different pollutant concentrations on the temperature field and the restoration efficiency can be obtained by an inversion algorithm.
The faster the pollutant is diffused, the faster the pollutant (high resistance body) is reduced, the more uniform the temperature field distribution is, the higher the overall temperature of the temperature field is, the more the pollutant amount is collected by the condenser pipe 14, the larger the pollutant increment in the condenser pipe 14 is, and the smaller the energy consumption is. If the above conditions are satisfied, it is indicated that the combination of the blowing flow, the pumping flow, the blowing position, the pumping position, the heating combination, the extraction combination and the temperature is the optimal way.
The experimental device can be used for researching the influence of different factors, such as blowing flow, air exhaust flow, blowing position, air exhaust position, heating combination, extraction combination, temperature and the like, on pollutant remediation efficiency and energy consumption. And finally, an optional collocation scheme is obtained, and a collocation mode with high energy consumption and low restoration efficiency is avoided. In addition, according to needs, if higher requirements are required for the repair efficiency, the collocation mode with high repair efficiency is the optimal mode under the condition of ensuring lower energy consumption, if higher requirements are required for economy, and the influence of energy consumption is considered under the condition of ensuring higher repair efficiency.
In this embodiment, the experimental apparatus further comprises a multifunctional inspection instrument 10, the multifunctional inspection instrument 10 is connected with the plurality of sensors 9 through a conducting wire, and the multifunctional inspection instrument 10 is used for intensively displaying the reading of the sensors 9. The multifunctional patrol instrument 10 is arranged so that a user can read various parameters of the sensor 9 quickly, and meanwhile, the processing efficiency can be improved.
In this embodiment, the experimental apparatus further comprises a peristaltic pump 11, the peristaltic pump 11 passes through a through hole 103 located in the center of the upper cover 101 of the box body, and the peristaltic pump 11 is used for dripping pollutants into the detection soil and adjusting the injection rate of the pollutants so as to simulate the leakage condition of the pollutants.
In an example, referring to fig. 4, a peristaltic pump 11 is selected to inject NAPLs pollutants into the detection soil, in an experiment, NAPLs pollutants with different injection rates and different concentrations and different kinds of NAPLs pollutants are selected to perform NAPLs pollutant leakage simulation on the detection soil, or different kinds of NAPLs pollutants are selected to be respectively injected into the detection soil, so that the simulation on the possible leakage situation of multiple kinds of NAPLs pollutants is realized. Wherein the peristaltic pump 11 can also be replaced by an intravenous infusion set.
In one possible example, the diffusion law and the remediation process of a contaminant drip in the soil are studied. The peristaltic pump 11 is filled with NAPLS pollutants, such as diesel oil and other pollutants, the peristaltic pump 11 is set to drip into non-polluted soil at a certain titration speed, wherein the titration speed can be adjusted by 10s one drop or other titration speeds required by experiments, resistivity changes in the soil are collected by a high-density electrical method instrument, and the diffusion rule of the pollutants during leakage is inverted. After certain time of dripping, the polluted soil is restored according to the optimal heating parameters, the actual pollutant diffusion and temperature field distribution rule, the pollutants collected by the condenser pipe 14 and the energy consumption in the restoration process of the pollutants are researched, and the restoration condition of in-situ thermal desorption transverse heating is evaluated.
In this embodiment, a first flow meter 12 is disposed on a pipeline connecting between the heating pipe 2 and the steam generator 4, the first flow meter 12 is used for displaying a steam injection flow of the steam generator 4, a condensing pipe 14 and a second flow meter 13 are disposed on a pipeline connecting between the extraction pipe 3 and the vacuum pump 7, the condensing pipe 14 is used for collecting pollutants and measuring a pollutant remediation amount, and the second flow meter 13 is used for displaying an extraction flow of the vacuum pump 7.
The arrangement of the first flowmeter 12 and the second flowmeter 13 is helpful for reading the steam injection flow of the steam generator 4 and the extraction flow of the vacuum pump 7, so that the heat conduction heating repair efficiency can be regulated and controlled by regulating and controlling different steam injection flows and extraction flows, the condenser pipe 14 is arranged to collect pollutants and measure the pollutant repair amount, and the pollutant repair efficiency can be more accurately obtained according to the pollutant repair amount.
In one example, the output or extraction airflow rate of the steam generator 4 and the vacuum pump 7 is regulated through the steam injection flow rate and the extraction flow rate displayed by the first flow meter 12 and the second flow meter 13, and then the remediation efficiency of the detected soil or the diffusion law of NAPLs pollutants under different gas flow rates is detected by respectively regulating the airflow rate of the steam generator 4 and the vacuum pump 7.
In this embodiment, the power station 5 further comprises an electric energy meter 15, and the electric energy meter 15 is used for detecting the energy consumption of the steam generator 4, the heating pipe 2 and the vacuum pump 7 under different arrangement conditions of the extraction pipe 3 and the heating pipe 2.
The electric energy meter 15 is arranged to obtain the common energy consumption of the steam generator 4, the heating pipe 2 and the vacuum pump 7 under different arrangement conditions, and meanwhile, the optimal heating parameters are found by recording the temperature, air pressure and humidity change conditions, the temperature field distribution conditions and the energy consumption conditions of each combination, which are acquired by each sensor 9 in the soil.
Based on the experimental device, the embodiment of the application further discloses an experimental method for thermal desorption of contaminated soil, and as shown in fig. 4, the steps include S401 to S404.
Step S401, providing an experimental device for thermal desorption of contaminated soil.
Step S402, filling detection soil in an experiment box body 1 of an experiment device for thermal desorption of contaminated soil so that the detection soil contacts with an electrode 602; the power station 5 and the high-density electric method host 601 are started to work, the heating pipe 2 is used for heating the detection soil, and the vacuum pump 7 is started to enable the extraction pipe 3 to extract the detection soil within a preset time.
In this step, the multifunctional patrol instrument 10 can be started at the same time, and the monitoring of the parameters such as temperature, humidity and air pressure can be obtained through the sensor 9.
In step S403, the substance component in the extraction tube 3 is detected.
In this step, the material composition of the contaminated soil may be obtained by directly detecting the material composition in the condensation duct 14.
And S404, inverting to obtain a diffusion rule of the pollutant according to the material components and the resistivity profile of the detected soil collected by the high-density electrical method instrument, and obtaining the optimal thermal desorption parameter setting of the detected soil according to the diffusion rule of the pollutant.
Whether various pollutant components exist in the polluted soil is judged by setting the high-density electrical method host 601 and the electrode 602 to detect the diffusion rule in the polluted soil and detecting NAPLs pollutant components in the polluted soil, so that whether the corresponding diffusion rule in the standard polluted soil conforms to the standard is judged, and meanwhile, the optimal thermal desorption parameter setting can be obtained according to the relevant parameters obtained by the experimental device. The relevant parameters may be parameters such as temperature, humidity, and air pressure acquired by the sensor 9, and resistivity profile acquired by the high-density electrical method host 601.
In this embodiment, the method further includes:
before filling the test box body 1 with the test soil, filling standard soil without NAPLs, wherein the test soil is artificially prepared NAPLs polluted soil;
under the condition of detecting the standard soil, acquiring the material composition in the extraction pipe 3 and the standard parameters of the resistivity profile; and
and comparing the standard parameters for detecting the material composition and the resistivity profile in the extraction pipe 3 under the condition of the standard soil with the experimental parameters for detecting the material composition and the resistivity profile in the extraction pipe 3 under the condition of the soil.
After the restoration of the detection soil is realized through thermal desorption, the standard soil without NAPLs pollutants and the detection soil are compared in experimental parameters, and then the restoration condition of in-situ thermal desorption transverse heating is evaluated.
In the present embodiment, the detection soil is formed by dripping NAPLs pollutants into the standard soil through the peristaltic pump 11, wherein the pollutants drip into the detection soil at a preset titration speed; after the peristaltic pump 11 drips for a preset time, the detection soil is restored according to the optimal thermal desorption heating parameters, and the restoration condition of the detection soil is obtained.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides an experimental apparatus for be used for polluting native thermal desorption, includes experiment box (1), its characterized in that, an experimental apparatus for be used for polluting native thermal desorption still includes: the device comprises a heating pipe (2), an extraction pipe (3), a steam generator (4), a power station (5), an electric method detector (6), a vacuum pump (7) and a temperature controller (8); the experimental box body (1) is used for containing detection soil, one side wall of the experimental box body (1) is provided with uniformly distributed device holes (102), the heating pipe (2) and the extraction pipe (3) are inserted into the experimental box body (1) through the device holes (102), the heating pipe (2) is communicated with the steam generator (4) through a pipeline, the power supply station (5) is respectively communicated with the vacuum pump (7), the steam generator (4) and the temperature controller (8) to supply power to the heating pipe (2), the steam generator (4), the vacuum pump (7) and the temperature controller (8), the extraction pipe (3) is communicated with the vacuum pump (7), the steam generator (4) provides high-pressure steam for the heating pipe (2), the temperature controller (8) is electrically connected with the heating pipe (2) and the steam generator (4) to control the heating pipe (2) and the steam generator (4), the box body upper cover (101) of the experimental box body is provided with through holes (103) arranged in an array, and the electric high-density host (601) and the high-density host (601) are connected with the high-density host computer (601), a plurality of electrodes (602) penetrate through the through holes (103) and are positioned in the experiment box body (1), and the electrical method detecting instrument (6) is used for detecting the resistivity profile of each part of the detected soil.
2. The experimental device for thermal desorption of contaminated soil according to claim 1, characterized in that the heating pipes (2) and the extraction pipes (3) are alternately arranged in the experimental box body (1).
3. The experimental device for the thermal desorption of contaminated soil according to the claim 1, characterized in that, the experimental device further comprises a plurality of sensors (9), a plurality of sensors (9) are connected in series through a wire, and the sensors (9) are arranged on the axis of the through hole (103).
4. The experimental device for thermal desorption of contaminated soil according to claim 3, wherein the sensor (9) is an integrated sensor capable of collecting soil temperature, humidity and air pressure.
5. The experimental device for the thermal desorption of the polluted soil according to the claim 3, characterized in that the experimental device further comprises a multifunctional patrol instrument (10), the multifunctional patrol instrument (10) is electrically connected with a plurality of the sensors (9), and the multifunctional patrol instrument (10) is used for displaying the reading of the sensors (9).
6. The experimental device for thermal desorption of contaminated soil according to claim 1, further comprising a peristaltic pump (11), wherein the peristaltic pump (11) passes through the through hole (103) located at the center of the upper cover (101) of the box body, and the peristaltic pump (11) is used for dripping contaminants into the detected soil and adjusting the injection rate of the contaminants so as to simulate the contaminant leakage condition.
7. The experimental device for thermal desorption of contaminated soil according to claim 1, wherein a first flow meter (12) is arranged on a pipeline connected between the heating pipe (2) and the steam generator (4), the first flow meter (12) is used for displaying the steam injection flow of the steam generator (4), a condensing pipe (14) and a second flow meter (13) are arranged on a pipeline connected between the extraction pipe (3) and the vacuum pump (7), the condensing pipe (14) is used for collecting contaminants, and the second flow meter (13) is used for displaying the extraction flow of the vacuum pump (7).
8. The experimental apparatus for thermal desorption of contaminated soil according to claim 1, wherein the power supply station (5) further comprises an electric energy meter (15), and the electric energy meter (15) is used for detecting the energy consumption of the steam generator (4), the heating pipe (2) and the vacuum pump (7) under different arrangement conditions of the extraction pipe (3) and the heating pipe (2).
9. An experimental method for thermal desorption of contaminated soil, which is applied to the experimental apparatus for thermal desorption of contaminated soil according to any one of claims 1 to 8, and is characterized in that the method comprises the following steps:
providing the experiment box body (1);
filling detection soil in the experiment box body (1) so that the detection soil contacts the electrode (602); the power supply station (5) and the high-density electrical method host (601) are started to work, the heating pipe (2) is used for heating the detection soil, and the vacuum pump (7) is started to enable the extraction pipe (3) to extract air from the detection soil within a preset time;
detecting the substance composition in the extraction tube (3); and
and according to the material components and the resistivity profile of the detected soil collected by the high-density electrical method instrument, inverting to obtain the diffusion rule of the pollutants, and acquiring the optimal thermal desorption parameter setting of the detected soil according to the diffusion rule of the pollutants.
10. The method of claim 9, further comprising:
before filling the test box body (1) with the test soil, filling standard soil without NAPLs, wherein the test soil is artificially prepared NAPLs polluted soil;
under the condition of detecting the standard soil, acquiring the material composition in the extraction pipe (3) and the standard parameters of the resistivity profile; and
and comparing the standard parameters of the material composition and the resistivity profile in the extraction pipe (3) under the condition of detecting the standard soil with the experimental parameters of the material composition and the resistivity profile in the extraction pipe (3) under the condition of detecting the soil.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116727428A (en) * | 2023-06-28 | 2023-09-12 | 江苏炭耕农业科技有限公司 | Contaminated soil restoration device and contaminated soil crushing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116727428A (en) * | 2023-06-28 | 2023-09-12 | 江苏炭耕农业科技有限公司 | Contaminated soil restoration device and contaminated soil crushing equipment |
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