CN104833788B - Polluted soil restoration process simulation test system - Google Patents
Polluted soil restoration process simulation test system Download PDFInfo
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- CN104833788B CN104833788B CN201410856354.6A CN201410856354A CN104833788B CN 104833788 B CN104833788 B CN 104833788B CN 201410856354 A CN201410856354 A CN 201410856354A CN 104833788 B CN104833788 B CN 104833788B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a simulation test system for a polluted soil restoration process, and belongs to the field of environmental geotechnical engineering. The simulation test system for the contaminated soil remediation process can be used for carrying out test simulation of various remediation technologies such as aeration, steam extraction, thermal desorption, chemical leaching and the like through the optimized arrangement of the system, and can also be used for simulating the migration process of fluid in a porous medium. The sample loading bin and the heating bin can freely rotate, and can respectively simulate the transportation characteristics of gas and liquid in the vertical direction, the horizontal direction or any direction of a soil body; the device is provided with a gas supply liquid device and a tail gas tail liquid collecting and processing device, and can respectively provide gas and liquid as transport carriers or simulate the migration process of the gas and the liquid; the intelligent control of the test process ensures the normal operation of the instrument and the accurate control of parameters, and provides test efficiency. The test system provided by the invention has the advantages of reasonable structure, simplicity in operation, convenience in use, multiple purposes, wide application range, no secondary pollution and wide practical value and application prospect.
Description
Technical Field
The invention relates to a simulation test system for a polluted soil restoration process, which is mainly used for indoor test research of polluted soil restoration and can also be used for simulating a transmission process of pollutants in a rock-soil body, and belongs to the field of environmental geotechnical engineering.
Background
With the rapid development of the industry and agriculture in China, a large amount of pollutants, especially volatile organic pollutants and heavy metals, are discharged into air, water and soil. Soil eventually settles as a variety of pollutants, the accumulation of which in large quantities has become one of its major environmental problems. After entering the soil, the pollutants not only influence the growth and development of plants and the variation of biological communities, so that the yield and quality of grains are reduced, and serious threat is formed to the safety of agricultural products, but also secondary pollution is caused to surface water and underground water, and the human health is directly or indirectly endangered. In recent years, soil pollution problems in China are increasingly apparent, and serious threats are formed to ecological environment, food safety and human health. Research on migration rules of pollutants and restoration of contaminated soil have become an important topic in the field of environmental science for recent decades.
Any research of natural science disciplines needs to be carried out by means of certain test equipment, so that the development of novel and efficient test equipment is an important means for improving the research level of polluted soil restoration science and is also a work focus of environmental geotechnical engineering technicians. At present, the remediation method for the volatile organic compound contaminated soil mainly comprises aeration, steam extraction, thermal desorption and the like, and the remediation method for the inorganic contaminated soil such as heavy metal and the like mainly comprises chemical leaching, chemical stabilization and the like. At present, a large number of students develop the development work of related experimental research equipment aiming at the repairing method at home and abroad. However, most of the existing related test equipment can only complete one type of test, and a set of equipment cannot be adopted to conduct various types of test researches. The method increases the processing or purchasing cost of test equipment to a certain extent, and restricts the research and development of pollutant migration and soil remediation methods. Therefore, the development of the simulation test system for the polluted soil restoration process has important significance for improving the research level of the field of environmental geotechnical engineering, promoting the research and development of the polluted soil restoration technology and promoting the development of the discipline of the soil environment.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a polluted soil restoration process simulation test system.
In order to achieve the above purpose, the technical solution is as follows: the test system consists of a gas supply and liquid supply device, a heating and repairing device, a tail gas and tail liquid collecting and processing device, a lifting supporting device and an automatic control and data acquisition device.
The liquid supply device comprises a liquid storage tank, a advection pump, a vapor generator, a booster pump and a gas storage tank, wherein a liquid outlet of the liquid storage tank is connected to a liquid inlet of the advection pump through a hose through a first three-way valve, a liquid outlet of the advection pump is connected to a liquid inlet of the vapor generator through a hose, a gas outlet of the vapor generator is connected to the four-way valve through a hose, the first three-way valve is connected to the liquid inlet of the booster pump through a hose, a liquid outlet of the booster pump is connected to the four-way valve through a hose, a gas outlet of the gas storage tank is connected to the four-way valve through a hose, and pressure regulating valves are respectively arranged on a hose connected with the four-way valve, the booster pump and the four-way valve, and a hose connected with the four-way valve.
The heating repairing device comprises a sample loading bin, a heating bin and a motor, wherein the sample loading bin and the heating bin are respectively hollow cylindrical, the heating bin is sealed and sleeved outside the sample loading bin, a hollow interlayer is formed between the outer wall of the sample loading bin and the inner wall of the heating bin, a heater group is arranged in the hollow interlayer, two ends of the sample loading bin are respectively provided with a feeding spiral sealing cover and a discharging spiral sealing cover, the feeding spiral sealing cover is provided with an air inlet liquid inlet, the discharging spiral sealing cover is provided with an air outlet liquid outlet, two ends in the sample loading bin are respectively provided with a filtering water permeable plate, a transmission gear is fixedly arranged on the outer wall of the sample loading bin close to one end of the discharging spiral sealing cover, and the transmission gear is meshed with a driving gear connected to a motor spindle.
The tail gas tail liquid collecting and treating device consists of a dust filter, an activated carbon adsorber and a tail liquid collector, wherein a first vacuum pump air inlet is connected to an activated carbon adsorber air outlet through a hose, an activated carbon adsorber air inlet is connected to a dust filter air outlet through a hose, a dust filter air inlet is connected to a second three-way valve through a hose, a second vacuum pump air inlet is connected to the tail liquid collector air outlet through a hose, a tail liquid collector air inlet is connected to the second three-way valve through a hose, and pressure regulating valves are respectively arranged on the hose for connecting the dust filter with the second three-way valve and the hose for connecting the tail liquid collector with the second three-way valve; the four-way valve is connected to an air inlet and a liquid inlet on the feeding spiral sealing cover through a hose, a valve is arranged on the connecting hose, and the second three-way valve is connected to an air outlet and a liquid outlet on the discharging spiral sealing cover through a hose.
The lifting support device comprises a supporting rolling ring, rolling ring supports, lifting platforms, roller supports and supports, wherein the supports are symmetrically arranged on two sides of the lifting platforms, rotating shafts are respectively arranged at the upper ends of the supports, the rotating shafts are respectively movably inserted into the wall surfaces of the heating bin, the rolling ring supports are symmetrically arranged at two ends of the upper side of the lifting platform, the supporting rolling ring is symmetrically sleeved at two ends of the sample loading bin, the supporting rolling ring and the rolling ring supports are connected through pins, the roller supports are symmetrically arranged below the lifting platforms, and the motor is fixedly arranged on the lifting platforms.
The automatic control and data acquisition device consists of a computer, a data acquisition box and a sensor, wherein a first temperature sensor and a pressure sensor are respectively arranged on the inner wall of the sample loading bin, a second temperature sensor is arranged in the hollow interlayer, a third temperature sensor is arranged in the steam generator, the first temperature sensor, the second temperature sensor, the third temperature sensor and the pressure sensor are respectively connected to the data acquisition box through data wires, and the data acquisition box is connected to the computer through the data wires.
By adopting the technical scheme, the polluted soil restoration process simulation test system can develop scientific researches of various restoration methods and technologies, and has the following technical characteristics and advantages:
1. through the optimization of the system, a set of system can be used for respectively carrying out experimental researches on a plurality of repairing methods such as aeration, steam extraction, thermal desorption, chemical leaching and the like, and can also be used for simulating the migration process of fluid in a porous medium.
2. The rotary supporting device is arranged, and the sample loading bin and the heating bin can freely rotate around the horizontal rotating shaft, so that the transport characteristics of gas and liquid in the vertical direction, the horizontal direction or any direction of a soil body can be respectively simulated by adopting one instrument.
3. The gas supply device and the tail gas tail liquid collecting and treating device are arranged, and gas, steam and liquid can be respectively provided as carrier gas or carrier liquid through the control of the valve, or the transportation process of water steam, water, liquid and gaseous pollutants can be simulated.
4. The temperature sensor and the pressure sensor are connected with the computer, so that intelligent control of the test process is realized, normal operation of the instrument and accurate control of parameters are effectively ensured, and test efficiency is provided.
The simulation test system for the polluted soil restoration process has the advantages of reasonable structure, simple operation, convenient use, multiple functions, wide application range, no secondary pollution and wide application prospect and practical value.
Drawings
FIG. 1 is a schematic diagram of a simulation test system for the contaminated soil remediation process according to the present invention.
FIG. 2 is a schematic structural diagram of a heating repair device.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings: see the attached drawings
The polluted soil restoration process simulation test system consists of an air supply and liquid supply device, a heating restoration device, a tail gas and tail liquid collecting and processing device, a lifting support device and an automatic control and data acquisition device.
The air and liquid supply device consists of a liquid storage tank 1, a horizontal pump 3, a vapor generator 4, a booster pump 6 and a gas storage tank 7. The liquid outlet of the liquid storage tank 1 is connected to the liquid inlet of the advection pump 3 through a hose via a first three-way valve 2. The liquid outlet of the advection pump 3 is connected to the liquid inlet of the steam generator 4 through a hose. The air outlet of the steam generator 4 is connected to the four-way valve 5 through a hose. The advection pump 3 injects distilled water or other liquid in the liquid storage tank 1 into the steam generator 4, heats the distilled water or other liquid into steam with a preset temperature, and then adjusts the steam to a preset pressure through the pressure regulating valve. The first three-way valve 2 is in turn connected to the inlet of the booster pump 6 by a hose. The liquid outlet of the booster pump 6 is connected to the four-way valve 5 through a hose. The booster pump 6 directly boosts the pressure of the liquid in the liquid storage tank 1, and then adjusts the pressure to a predetermined pressure through a pressure regulating valve. The air outlet of the air storage tank 7 is connected to the four-way valve 5 through a hose. The high-pressure gas in the gas tank 7 is regulated to a predetermined pressure by a pressure regulating valve. Pressure regulating valves are respectively arranged on a hose connected with the four-way valve 5 by the steam generator 4, a hose connected with the four-way valve 5 by the booster pump 6 and a hose connected with the four-way valve 5 by the air storage tank 7.
The heating repair device consists of a sample loading bin 10, a heating bin 11 and a motor 18. The sample loading bin 10 and the heating bin 11 are respectively hollow cylindrical. The heating bin 11 is sealed and sleeved outside the sample loading bin 10. A hollow interlayer 12 is formed between the outer wall of the sample loading bin 10 and the inner wall of the heating bin 11. A heater group 13 is arranged in the hollow interlayer 12. The sample loading bay 10 is used to hold samples, which may be loose or compacted in size with the cavity. The two ends of the sample loading bin 10 are respectively provided with a feeding spiral sealing cover 9 and a discharging spiral sealing cover 15. The feeding spiral sealing cover 9 is provided with an air inlet and a liquid inlet, and the discharging spiral sealing cover 15 is provided with an air outlet and a liquid outlet. And the two ends in the sample loading bin 10 are respectively provided with a filtering water permeable plate 14. The water-permeable filtering plate 14 serves to filter water and gas in the sample and smoothly flow in and out of the sample. The feeding screw sealing cover 9 and the discharging screw sealing cover 15 are used for sealing the sample loading bin 10. A transmission gear 16 is fixedly arranged on the outer wall of one end, close to the discharging spiral sealing cover 15, of the sample loading bin 10, and the transmission gear 16 is meshed with a driving gear 17 connected to a main shaft of a motor 18;
the tail gas and tail liquid collecting and treating device consists of a dust filter 20, an activated carbon adsorber 21 and a tail liquid collector 22, and is used for collecting and treating tail gas and tail liquid respectively. The first vacuum pump air inlet is connected to the activated carbon adsorber 21 air outlet through a hose, the activated carbon adsorber 21 air inlet is connected to the dust filter 20 air outlet through a hose, and the dust filter 20 air inlet is connected to the second three-way valve 2 through a hose. The second vacuum pump inlet is connected to the tail fluid collector 22 outlet via a hose. The air inlet of the tail liquid collector 22 is connected to the second three-way valve 2 through a hose, and pressure regulating valves are respectively arranged on the hose connected with the dust filter 20 and the second three-way valve 2 and the hose connected with the tail liquid collector 22 and the second three-way valve 2. The four-way valve 5 is connected to an air inlet and a liquid inlet on the feeding spiral sealing cover 9 through a hose, a valve 8 is arranged on the connecting hose, and the second three-way valve 2 is connected to an air outlet and a liquid outlet on the discharging spiral sealing cover 15 through a hose. The vacuum pump produces a pumping force, and the gas or liquid generated in the sample loading bin 10 is pumped into the dust filter 20, the activated carbon adsorber 21 or the tail liquid collector 22 for collection and treatment through the pressure regulating valve.
The lifting support device consists of a support rolling ring 23, a rolling ring support 25, a lifting platform 26, roller supports 27 and supports 28, wherein the supports 28 are symmetrically arranged on two sides of the lifting platform 26, the upper ends of the supports 28 are respectively provided with a rotating shaft 29, and the rotating shafts 29 are respectively movably inserted into the wall surface of the heating bin 11. The heating repair device may be rotated at any angle about the rotation axis 29. The two ends above the lifting platform 26 are symmetrically provided with rolling ring brackets 25, the supporting rolling rings 23 are symmetrically sleeved at the two ends of the sample loading bin 10, and the supporting rolling rings 23 are connected with the rolling ring brackets 25 through pins 24. The sample loading bin 10 can freely rotate around a central shaft in the supporting rolling ring 23, roller brackets 27 are symmetrically arranged below the lifting platform 26, and the motor 18 is fixedly arranged on the lifting platform 26. When the test sample needs to be vertically arranged or the test sample is installed and removed, the pins 24 are removed, the lifting platform 26 is started and lowered, the heating repairing device is separated from the lifting supporting device, and the lifting platform is removed.
The automatic control and data acquisition device is composed of a computer, a data acquisition box and a sensor, wherein a first temperature sensor 30 and a pressure sensor 31 are respectively arranged on the inner wall of the sample loading bin 10, a second temperature sensor 32 is arranged in the hollow interlayer 12, a third temperature sensor 33 is arranged in the steam generator 4, the first temperature sensor 30, the second temperature sensor 32, the third temperature sensor 33 and the pressure sensor 31 are respectively connected to the data acquisition box through data wires, and the data acquisition box is connected to the computer through the data wires.
Working principle of polluted soil restoration process simulation test system:
1. taking out and downloading the sample loading bin 10, sequentially installing the filtering water permeable plate 14 and the discharging spiral sealing cover 15 at the outlet of the sample loading bin 10, loading samples into the sample loading bin 10 from the inlet of the sample loading bin 10, and sequentially installing the filtering water permeable plate 14 and the feeding spiral sealing cover 9. The sample loading chamber 10 is inserted into the heating chamber 11. When a sample horizontal state simulation test is carried out, such as an aeration repair test, a thermal desorption repair test, a steam extraction repair test and a horizontal migration process simulation test, the lifting platform 26 is pushed to the lower part of the heating bin 11, so that the transmission gear 16 on the outer wall of the sample loading bin is meshed with the driving gear 17 fixed on the rotating shaft of the motor 18, and the supporting rolling rings 23 at two ends are aligned with the grooves of the rolling ring brackets 25 on the lifting platform 26 and fixed by the pins 24; when the sample vertical state simulation test is performed, for example, the chemical leaching test and the vertical migration process simulation test are performed, the heating chamber 11 and the sample loading chamber 10 are rotated to be in a horizontal state.
2. Connecting lines, checking the tightness of the valves and hoses, and opening the computer and software system. According to the test requirement, selecting one of the following steps 1) to 3) to perform the test:
1) When the vapor of the liquid is required to be injected, all valves are closed, a computer controls to open the vapor generator 4, heat the vapor to a preset temperature, adjust the first three-way valve 2, enable a hose between the liquid storage tank 1 and the advection pump 3 to be communicated, open the advection pump 3, enable the liquid to flow into the vapor generator 4 and be heated to vapor with a preset temperature, adjust a pressure regulating valve between the vapor generator 4 and the four-way valve 5 to a preset pressure, adjust the four-way valve 5, enable the pressure regulating valve between the vapor generator 4 and the four-way valve 5 to be communicated with the hose between the four-way valve 5, and prepare for injecting the vapor;
2) When liquid needs to be injected, all valves are closed, the first three-way valve 2 is regulated to enable hoses between the liquid storage tank 1 and the booster pump 6 to be communicated, the booster pump 6 is opened, a pressure regulating valve between the booster pump 6 and the four-way valve 5 is regulated to a preset pressure, the four-way valve 5 is regulated to enable the pressure regulating valve between the booster pump 6 and the four-way valve 5 to be communicated with the hoses between the four-way valve 5, and liquid injection is prepared;
3) When gas needs to be injected, all valves are closed, the pressure regulating valve between the gas storage tank 7 and the four-way valve 5 is regulated to a preset pressure, the four-way valve 5 is regulated, and the pressure regulating valve between the gas storage tank 7 and the four-way valve 5 is communicated with a hose between the four-way valve 5, so that gas is prepared for injection.
3. Valve 8 is opened to allow vapor, liquid or gas to pass through cartridge 10. When the thermal desorption test is performed or other conditions requiring the sample loading bin 10 to rotate, the motor 18 is started, and the sample loading bin 10 is driven to rotate by the motor 18.
4. And (3) while the sample loading bin 10 is aerated and flooded, one of the following steps 1) to 2) is selected for testing according to test requirements:
1) When the test is carried out by adopting gas or steam, the second three-way valve 19 is regulated, so that the outlet of the sample loading bin 10 is communicated with the dust filter 20, and the first vacuum pump connected with the activated carbon adsorber 21 is turned on;
2) When a liquid is used for the test, the second three-way valve 19 is adjusted so that the outlet of the sample loading chamber 10 is communicated with the tail liquid collector 22, and a second vacuum pump connected with the tail liquid collector 22 is turned on.
According to the process, different functional units are selected according to different test requirements, so that different types of test researches can be completed.
Claims (1)
1. The application of the polluted soil remediation process simulation test system in the process of aeration, steam extraction, thermal desorption, chemical leaching and simulating the migration of fluid in a porous medium is characterized in that: the polluted soil restoration process simulation test system consists of a gas supply and liquid supply device, a heating restoration device, a tail gas and tail liquid collecting and processing device, a lifting support device and an automatic control and data acquisition device;
the air supply and liquid supply device consists of a liquid storage tank (1), a horizontal pump (3), a vapor generator (4), a booster pump (6) and an air storage tank (7), wherein a liquid outlet of the liquid storage tank (1) is connected to a liquid inlet of the horizontal pump (3) through a hose through a first three-way valve (2), a liquid outlet of the horizontal pump (3) is connected to a liquid inlet of the vapor generator (4) through a hose, an air outlet of the vapor generator (4) is connected to a four-way valve (5) through a hose, the first three-way valve (2) is connected to a liquid inlet of the booster pump (6) through a hose, a liquid outlet of the booster pump (6) is connected to the four-way valve (5) through a hose, and pressure regulating valves are respectively arranged on a hose connected with the vapor generator (4) and the four-way valve (5), a hose connected with the booster pump (6) and a hose connected with the four-way valve (5);
the heating repair device comprises a sample loading bin (10), a heating bin (11) and a motor (18), wherein the sample loading bin (10) and the heating bin (11) are respectively hollow cylindrical, the heating bin (11) is sealed and sleeved outside the sample loading bin (10), a hollow interlayer (12) is formed between the outer wall of the sample loading bin (10) and the inner wall of the heating bin (11), a heater group (13) is arranged in the hollow interlayer (12), two ends of the sample loading bin (10) are respectively provided with a feeding spiral sealing cover (9) and a discharging spiral sealing cover (15), an air inlet and a liquid inlet are formed in the feeding spiral sealing cover (9), an air outlet and a liquid outlet are formed in the discharging spiral sealing cover (15), filtering water permeable plates (14) are respectively arranged at two ends in the sample loading bin (10), a transmission gear (16) is fixedly arranged on the outer wall, close to one end of the discharging spiral sealing cover (15), of the sample loading bin (10), and meshed with a driving gear (17) connected with a main shaft of the motor (18);
the tail gas tail liquid collecting and treating device is composed of a dust filter (20), an activated carbon adsorber (21) and a tail liquid collector (22), wherein a first vacuum pump air inlet is connected to an air outlet of the activated carbon adsorber (21) through a hose, an air inlet of the activated carbon adsorber (21) is connected to an air outlet of the dust filter (20) through a hose, the air inlet of the dust filter (20) is connected to a second three-way valve (19) through a hose, a second vacuum pump air inlet is connected to an air outlet of the tail liquid collector (22) through a hose, the air inlet of the tail liquid collector (22) is connected to the second three-way valve (19) through a hose, and pressure regulating valves are respectively arranged on the hoses of the dust filter (20) and the second three-way valve (19) and on the hoses of the tail liquid collector (22) and the second three-way valve (19); the four-way valve (5) is connected to an air inlet and a liquid inlet on the feeding spiral sealing cover (9) through a hose, a valve (8) is arranged on the connecting hose, and the second three-way valve (19) is connected to an air outlet and a liquid outlet on the discharging spiral sealing cover (15) through a hose;
the lifting support device comprises a support rolling ring (23), a rolling ring support (25), a lifting platform (26), roller supports (27) and supports (28), wherein the supports (28) are symmetrically arranged on two sides of the lifting platform (26), rotating shafts (29) are respectively arranged at the upper ends of the supports (28), the rotating shafts (29) are respectively movably inserted into the wall surfaces of the heating bin (11), the heating repair device can rotate by any angle around the rotating shafts (29), the rolling ring supports (25) are symmetrically arranged at two ends above the lifting platform (26), the support rolling ring (23) is symmetrically sleeved at two ends of the sample loading bin (10), the support rolling ring (23) and the rolling ring supports (25) are connected through pins (24), the sample loading bin (10) can freely rotate around a central shaft in the support rolling ring (23), the roller supports (27) are symmetrically arranged below the lifting platform (26), and the motor (18) is fixedly arranged on the lifting platform (26). When the sample needs to be vertically arranged or the sample is installed and removed, the pin (24) is removed, the lifting platform (26) is started and lowered, the heating repairing device is separated from the lifting supporting device, and the lifting platform is removed;
the automatic control and data acquisition device is composed of a computer, a data acquisition box and a sensor, wherein a first temperature sensor (30) and a pressure sensor (31) are respectively arranged on the inner wall of a sample loading bin (10), a second temperature sensor (32) is arranged in a hollow interlayer (12), a third temperature sensor (33) is arranged in a steam generator (4), and the first temperature sensor (30), the second temperature sensor (32), the third temperature sensor (33) and the pressure sensor (31) are respectively connected to the data acquisition box through data wires, and the data acquisition box is connected to the computer through the data wires.
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| CN106277364B (en) * | 2016-09-20 | 2019-05-17 | 河南理工大学 | The imitative experimental appliance and its experimental method of in-situ immobilization richness nitrogen GEOTHERMAL WATER effect |
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| CN111266396B (en) * | 2020-03-16 | 2021-05-04 | 湖南恒凯环保科技投资有限公司 | Continuous preparation and injection integrated equipment for in-situ remediation chemical agent |
| CN112213307B (en) * | 2020-09-30 | 2023-05-23 | 东南大学 | Microscopic observation system and method for thermal desorption and aeration repair process |
| CN113426816B (en) * | 2021-05-26 | 2022-12-13 | 天津大学 | Intelligent remediation system and remediation method for contaminated site |
| CN114965956B (en) * | 2022-05-23 | 2023-04-11 | 同济大学 | Multifunctional casing for fracturing, permeability-increasing and cooperative repairing test of low-permeability polluted soil |
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