CN212216583U - Heterotopic soil vapor extraction system is reinforceed to dystopy thermal desorption high temperature tail gas - Google Patents
Heterotopic soil vapor extraction system is reinforceed to dystopy thermal desorption high temperature tail gas Download PDFInfo
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- CN212216583U CN212216583U CN202020247767.5U CN202020247767U CN212216583U CN 212216583 U CN212216583 U CN 212216583U CN 202020247767 U CN202020247767 U CN 202020247767U CN 212216583 U CN212216583 U CN 212216583U
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Abstract
The utility model discloses an heterotopic soil vapor phase extraction system is reinforceed to dystopy thermal desorption high temperature tail gas, including high temperature tail gas delivery system, pollute soil heap, extraction processing system. The thermal desorption high-temperature tail gas is used for heating the polluted soil, so that the organic pollutants are efficiently desorbed from the soil particle medium, and then the soil vapor extraction technology is selected to remove the polluted gas from the soil pile. The gas is purified through the processes of gas-water separation, sewage treatment, dust removal by a bag-type dust remover, adsorption by an activated carbon box and the like.
Description
Technical Field
The utility model relates to an organic contaminated soil dystopy restoration field especially relates to heterotopic vapor extraction field is reinforceed to thermal desorption tail gas.
Background
With the advance of the construction of Chinese ecological civilization, a large number of chemical, printing and dyeing and pesticide enterprises are shut down or moved out of the urban area. But the problem of pollution of the original site is prominent due to long-term production activities, and the human health is seriously threatened. This restricts the development and utilization and further planning of the original plant.
The soil vapor extraction is one of the main current foreign technologies for repairing volatile organic contaminated soil, is used for treating the problem of soil organic contamination, is greatly influenced by temperature and pollutant properties, is difficult to repair and reach the standard in seasons with low temperature such as autumn and winter or under the condition of pollutants with poor volatility and the like, and is time-consuming and labor-consuming.
The soil thermal desorption is a common technology for repairing volatile and semi-volatile organic pollutants, and the repairing effect is obvious. However, the energy consumption is high in the process of restoring the polluted soil by heat desorption, a large amount of high-temperature hot gas is generated, and if the high-temperature hot gas is directly discharged, the heat energy is wasted.
The ectopic thermal desorption and the ectopic gas phase extraction technology are combined, and the polluted soil is heated by using the ectopic thermal desorption high-temperature tail gas (the temperature is about 100 ℃), so that the waste heat in the thermal desorption repair process is recovered, the utilization rate of heat energy is improved, and the policy of energy conservation and emission reduction in China is responded; the desorption rate of pollutants in the soil is accelerated, the remediation efficiency is improved, the remediation period is shortened, and the remediation cost is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a soil dystopy vapor phase extraction system is reinforceed to dystopy thermal desorption high temperature tail gas accelerates pollutant desorption speed, shortens the restoration time limit for a project, improves the remediation efficiency.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides an ectopic soil vapor extraction system is reinforceed to dystopy thermal desorption high temperature tail gas which characterized in that: comprises a high-temperature tail gas distribution system, a polluted soil pile body and an extraction treatment system;
the high-temperature tail gas distribution system comprises a thermal desorption high-temperature gas, a sampling port and a gas transmission main pipe which are sequentially connected to process the high-temperature tail gas to reach the standard, the gas transmission main pipe is connected with a plurality of gas transmission branch pipes, each gas transmission branch pipe is horizontally introduced into the polluted soil pile body, and sieve holes are formed in the wall of each gas transmission branch pipe of the polluted soil pile body to form a sieve hole section;
the extraction treatment system comprises air exhaust branch pipes horizontally arranged in the polluted soil pile body, the air exhaust branch pipes are collected to an air exhaust main pipe, the air exhaust main pipe is connected to the extraction treatment system, and sieve holes are formed in the wall of the air exhaust branch pipes in the polluted soil pile body to form sieve hole sections.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: the main gas transmission pipe is provided with a main gas transmission rotary valve and a main gas transmission flow regulator, and each gas transmission branch pipe is provided with a branch rotary valve, a branch pressure gauge and a branch flow regulator.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: each air exhaust branch pipe is provided with a branch rotary valve and a branch pressure gauge.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: the polluted soil pile body is in a frustum pyramid shape with a small top and a big bottom, and the number of the gas transmission branch pipes paved from the top to the bottom of the pile body is increased progressively in sequence.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: gas flow electromagnetic valves are arranged at intervals in the long side direction of the polluted soil pile body on each gas transmission branch pipe, the gas flow electromagnetic valves have the function that high-temperature tail gas can be uniformly distributed in the soil pile body through the gas transmission branch pipes, and the gas flow electromagnetic valves on the upper layer and the lower layer which are adjacent are arranged in a staggered mode; the opening/closing of the gas flow solenoid valve can be controlled by the solenoid valve control box.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: the outside of the mesh sections of the gas pipe and the exhaust pipe are wrapped with filter screens, and the periphery of each filter screen is covered with a gravel layer.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: a row of temperature detection alarms are uniformly distributed on the top of the polluted soil pile body along the long edge direction, and temperature probes of the temperature detection alarms are respectively inserted into different heights of the polluted soil pile body in the vertical direction.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: the surface of the polluted soil pile is covered with a high-temperature-resistant and corrosion-resistant HDPE film, and the functions of the HDPE film comprise: (1) heat preservation; (2) the pile body forms a closed space to prevent secondary pollution in the extraction process; an isolation layer is laid below the polluted soil pile body, and a sewage collecting ditch is arranged on one side of the isolation layer.
Ectopic thermal desorption high-temperature tail gas reinforced ectopic soil vapor extraction system, wherein: the main exhaust pipe is sequentially connected with an exhaust flow regulator, a gas-water separator, a vacuum pump, a bag-type dust collector, an activated carbon box and a chimney, and a liquid-phase outlet of the gas-water separator is connected with a sewage treatment device.
Compared with the prior art, adopt above-mentioned technical scheme the utility model has the advantages of: the utility model discloses utilize dystopy thermal desorption high temperature tail gas to pour into the pollution heap body into, accelerated volatile organic pollutant desorption speed, the extraction system can be with the pollutant of desorption in the soil space extract to processing apparatus fast, make the pollutant obtain effectual getting rid of, the biggest innovation point of this system is recycle high temperature tail gas, has reduced the waste of the energy, has improved the pollutant and has got rid of efficiency, has shortened repair time, the specially adapted uses the project that ectopic heat takes off and gaseous phase extraction simultaneously.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Description of reference numerals: 1-thermal desorption of high temperature gas; 2-a sampling port; 3-a main gas transmission pipe; 4-total gas transmission rotary valve; 5-total gas transmission flow regulator; 6-temperature detection alarm device; 7-electromagnetic valve control box; 8-gas flow solenoid valve; 9-gas transmission branch pipe; 10-an air exhaust branch pipe; 11-contaminated soil heap; 12-a gas-liquid separator; 13-a vacuum pump; 14-a sewage treatment plant; 15-bag dust collector; 16-an activated carbon box; 17-a chimney; 18-an isolation layer; 19-HDPE films; 20-branch rotary valve; 21-branch pressure gauge; 22-branch flow regulator; 23-a main exhaust pipe; 24-an extraction flow regulator; 25-branch pressure gauge; 26-a branched rotary valve; 27-a filter screen; 28-a gravel layer; 29-sewage collection trench.
Detailed Description
The following description of the present invention is provided in connection with the accompanying drawings, which are included to illustrate and explain the present invention and are not intended to limit the present invention.
The utility model provides an organic contaminated soil dystopy repair system for strengthening the vapor phase extraction effect, will treat prosthetic soil after piling up, adopts thermal desorption high temperature tail gas and vapor phase extraction to strengthen dystopy soil vapor phase extraction technique, specifically, combines the place to pollute the characteristic, and the pollutant of main processing includes benzene series thing, volatile organic pollutants such as chlorohydrocarbon.
As shown in fig. 1, the heterotopic thermal desorption high temperature tail gas strengthening heterotopic soil vapor extraction system provided by the preferred embodiment of the present invention comprises a high temperature tail gas distribution system, a contaminated soil pile 11 and an extraction treatment system.
The polluted soil pile body 11 is a prismoid body, and the specific scale is as follows: bottom length 40m, bottom width 15m, pile height 5m, slope ratio 1, top length 30m, top width 5m, soil volume 1750m3The water content of the soil is 16-25%.
Specifically, the high-temperature tail gas distribution system comprises a thermal desorption high-temperature gas 1, a sampling port 2 and a gas transmission main pipe 3 which are sequentially connected, wherein a main gas transmission rotary valve 4 and a main gas transmission flow regulator 5 are arranged on the gas transmission main pipe 3, the gas transmission main pipe 3 is connected with a plurality of gas transmission branch pipes 9, each gas transmission branch pipe 9 is provided with a branch rotary valve 20, a branch pressure gauge 21 and a branch flow regulator 22 and then horizontally introduced into the polluted soil pile body 11, and sieve holes are formed in the pipe wall of the gas transmission branch pipe 9 in the length direction of the polluted soil pile body 11 so as to form sieve hole sections, so that the thermal desorption high-temperature gas 1 is uniformly dispersed in the polluted soil pile body 11;
moreover, the plurality of gas transmission branch pipes 9 are distributed at the positions of at least three layers of the polluted soil pile body with different horizontal heights so as to ensure that all parts of the polluted soil pile body 11 are heated simultaneously, in the preferred embodiment, three layers of gas transmission branch pipes 9 are paved at the positions, with the height of 0.2m, 1.8m and 3.2m, of the polluted soil pile body 11 from the bottom surface, respectively, and two, four and six gas transmission branch pipes 9 are paved at equal intervals on the three layers of gas transmission branch pipes 9 from top to bottom; the main gas transmission pipe 3 and the branch gas transmission pipe 9 are made of high-temperature-resistant and corrosion-resistant stainless steel materials.
In order to ensure uniform gas transmission, gas flow electromagnetic valves 8 are arranged at intervals on the length of each gas transmission branch pipe 9 positioned in the polluted soil pile body 11, the gas transmission branch pipes 9 on the lower layer are more than the gas flow electromagnetic valves 8 arranged on the gas transmission branch pipes 9 on the upper layer, and the gas flow electromagnetic valves 8 on the two adjacent layers are arranged in a staggered manner in an inserting manner; in the preferred embodiment, three, four, five gas flow solenoid valves 8 are respectively installed on the upper layer gas transmission branch pipe 9, the middle layer gas transmission branch pipe 9 and the lower layer gas transmission branch pipe 9, and the control of the gas flow solenoid valves 8 is realized through the solenoid valve control box 7. In order to prevent the sieve pore section of the gas transmission branch pipe 9 from being blocked, a 60-mesh filter screen 27 is wrapped outside the sieve pore section, and a gravel layer 28 is covered around the filter screen. Gravel has larger voids and has a larger void fraction than soil.
Meanwhile, in order to avoid unnecessary heat loss, the parts of the gas transmission main pipe 3 and the gas transmission branch pipe 9 outside the polluted soil pile body 11 are subjected to heat preservation treatment. In a preferred embodiment, the surface of the pipe is wrapped with silicide heat insulation cotton.
The thermal desorption high-temperature gas 1 enters a gas transmission main pipe 3 after being sampled and detected to be qualified by a sampling port 2, and the gas flow is 500-650 m3H, then the gas is divided into gas transmission branch pipes 9, the pressure of each gas transmission branch pipe 9 is 0.01-0.02 MPa, and the flow is 41-82 m3Preferably,/h.
In order to detect the real-time temperatures of different positions of the polluted soil pile body 11 in the repairing process, a row of temperature detection alarms 6 are uniformly distributed in the long edge direction of the top of the polluted soil pile body 11, the horizontal interval of the temperature detection alarms is 5m, and the temperature detection alarms are respectively inserted into the positions, 0.5m, 1.5m, 2.5m, 3.5m, 4.5m and 5m away from the top surface, of the polluted soil pile body 11; for example, the alarm temperature may be set to 65 ℃, and an alarm may be generated when the temperature is lower than 65 ℃, so that the temperature of the contaminated soil pile 11 is not lower than 65 ℃ after being heated.
In the specific implementation process, the surface of the polluted soil pile body 11 is covered with a high-temperature-resistant and corrosion-resistant HDPE film 19, so that the sealing condition required by vapor extraction is met, and the secondary pollution caused by the escape of polluted gas into the atmosphere is also prevented; in order to prevent the percolate in the polluted soil pile body 11 from moving downwards, an isolation layer 18 is laid below the polluted soil pile body 11, a sewage collecting ditch 29 is arranged around the isolation layer 18 and is dredged to a sewage treatment device through a pipeline, and in the preferred embodiment, the length of the collecting ditch is determined according to the length of the bottom edge of the pile body, the width of the collecting ditch is 0.3m, and the depth of the collecting ditch is 0.5 m. The collecting ditch is built by red bricks, and the surface of the collecting ditch is coated with impermeable cement concrete. In addition, the sewage is collected the ditch and is used for collecting rainy season rainfall, prevents that the rainwater from being detained and implements the production influence to the engineering.
The extraction treatment system comprises an air exhaust branch pipe 10 arranged in a polluted soil pile body 11, wherein the air exhaust branch pipe 10 is converged to an air exhaust main pipe 23, the air exhaust main pipe 23 is sequentially connected with an air exhaust flow regulator 24, an air-water separator 12, a vacuum pump 13, a bag-type dust collector 15, an activated carbon box 16 and a chimney 17, and a liquid phase outlet of the air-water separator 12 is connected with a sewage treatment device 14.
Specifically, the length part of each air exhaust branch pipe 10 arranged in the polluted soil pile body 11 is provided with a sieve pore on the side wall to form an air exhaust section, the outer side of the air exhaust section is wrapped with a filter screen, the filter screen can be a 60-mesh screen, and a gravel layer covers the periphery of the screen. The main air exhaust pipe 23 and the branch air exhaust pipe 10 are made of high-temperature-resistant and corrosion-resistant stainless steel materials.
Moreover, the extraction branch pipes are distributed at the positions of at least three layers of different horizontal heights of the polluted soil pile body, in the preferred embodiment, three layers of extraction branch pipes are paved at the positions, 1m, 2.5m and 4m away from the bottom surface, of the polluted soil pile body 11 respectively, and two, four and six extraction branch pipes are paved at equal intervals from top to bottom by the three layers of extraction branch pipes;
the extraction branch pipes are extracted by negative pressure provided by a vacuum pump 13, and a branch pressure gauge 25 and a branch rotary valve 26 are arranged on each air extraction branch pipe 10, so that the air extraction flow of each air extraction branch pipe 10 is controlled to be 50-100 m3The negative pressure is controlled to be-0.01 MPa to-0.035 MPa, and the flow rate of the main pipe is controlled to be 450 m to 600m3/h。
The gas-water separator is used for carrying out gas-liquid separation on extracted multiphase pollutants, the polluted liquid is discharged after being treated to reach the standard, the polluted gas is intercepted by the bag-type dust remover 15 for dust mixed in the polluted gas, the polluted tail gas is adsorbed by active carbon and enters the chimney 17, the chimney 17 is provided with the sampling port 2, and the tail gas is monitored to be discharged after reaching the standard.
The repair cycle of the system to the polluted soil is 3 days.
Through the actual implementation of engineering, the pollutant treatment conditions are as follows through the treatment of the system:
the utility model discloses utilize and handle thermal desorption high temperature tail gas up to standard and pour into the pollution heap body into for volatile organic pollutant desorption speed, the extraction system can be with the pollutant of desorption in the soil space extract fast to processing apparatus, make the pollutant obtain effectual getting rid of through sewage treatment plant 14 and activated carbon box 16, the biggest innovation point of this system is recycle high temperature tail gas, has reduced the waste of the energy, has improved the pollutant and has got rid of efficiency, has shortened repair time.
Claims (9)
1. The utility model provides an ectopic soil vapor extraction system is reinforceed to dystopy thermal desorption high temperature tail gas which characterized in that: comprises a high-temperature tail gas distribution system, a polluted soil pile body and an extraction treatment system;
the high-temperature tail gas distribution system comprises a thermal desorption high-temperature gas for treating the high-temperature tail gas to reach the standard, a sampling port and a gas transmission main pipe which are sequentially connected, wherein the gas transmission main pipe is connected with a plurality of gas transmission branch pipes, each gas transmission branch pipe is horizontally introduced into the polluted soil pile body, and sieve holes are formed in the wall of each gas transmission branch pipe in the polluted soil pile body to form a sieve hole section;
the extraction treatment system comprises air exhaust branch pipes horizontally arranged in the polluted soil pile body, the air exhaust branch pipes are converged to an air exhaust main pipe, the air exhaust main pipe is connected to the extraction treatment system, and sieve holes are formed in the wall of the air exhaust branch pipes in the polluted soil pile body to form sieve hole sections.
2. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 1, wherein: the main gas transmission pipe is provided with a main gas transmission rotary valve and a main gas transmission flow regulator, and each gas transmission branch pipe is provided with a branch rotary valve, a branch pressure gauge and a branch flow regulator.
3. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 1, wherein: each air exhaust branch pipe is provided with a branch rotary valve and a branch pressure gauge.
4. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 1, wherein: the polluted soil pile body is in a frustum pyramid shape with a small top and a big bottom, and the number of the gas transmission branch pipes paved from the top to the bottom of the pile body is increased progressively in sequence.
5. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 4, wherein: the gas flow electromagnetic valves are arranged in the long side direction of the gas transmission branch pipes in the polluted soil pile body at intervals, the gas flow electromagnetic valves of the two layers of pipelines adjacent to each other are arranged in a staggered manner in an inserting mode, and the gas flow electromagnetic valves can be controlled to be opened/closed through the electromagnetic valve control box.
6. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 1, wherein: the outside of the mesh sections of the gas pipe and the exhaust pipe are wrapped with filter screens, and the periphery of each filter screen is covered with a gravel layer.
7. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 1, wherein: a row of temperature detection alarms are uniformly distributed on the top of the polluted soil pile body along the long edge direction, and temperature probes of the temperature detection alarms are respectively inserted into different heights of the polluted soil pile body in the vertical direction.
8. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 1, wherein: the surface of the polluted soil pile is covered with a high temperature resistant and corrosion resistant HDPE film, an isolation layer is laid below the polluted soil pile, and sewage collection ditches are arranged around the isolation layer.
9. The ex-situ thermal desorption high-temperature tail gas reinforced ex-situ soil vapor extraction system as claimed in claim 1, wherein: the main exhaust pipe is sequentially connected with an exhaust flow regulator, a gas-water separator, a vacuum pump, a bag-type dust collector, an activated carbon box and a chimney, and a liquid-phase outlet of the gas-water separator is connected with a sewage treatment device.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113369294A (en) * | 2021-06-10 | 2021-09-10 | 上海环土环境科技有限公司 | Polluted soil ex-situ low-carbon circulating thermal desorption system |
| CN114309049A (en) * | 2021-12-30 | 2022-04-12 | 北京建工环境修复股份有限公司 | Reaction device for ex-situ soil remediation and soil ex-situ remediation method |
| CN115026125A (en) * | 2022-06-29 | 2022-09-09 | 湖南平安环保股份有限公司 | Method for repairing organic contaminated soil by using energy-saving thermally-activated persulfate |
-
2020
- 2020-03-03 CN CN202020247767.5U patent/CN212216583U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113369294A (en) * | 2021-06-10 | 2021-09-10 | 上海环土环境科技有限公司 | Polluted soil ex-situ low-carbon circulating thermal desorption system |
| CN114309049A (en) * | 2021-12-30 | 2022-04-12 | 北京建工环境修复股份有限公司 | Reaction device for ex-situ soil remediation and soil ex-situ remediation method |
| CN115026125A (en) * | 2022-06-29 | 2022-09-09 | 湖南平安环保股份有限公司 | Method for repairing organic contaminated soil by using energy-saving thermally-activated persulfate |
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