CN112058887A - Pneumatic fracturing strengthening multiphase extraction system for pollution site treatment - Google Patents
Pneumatic fracturing strengthening multiphase extraction system for pollution site treatment Download PDFInfo
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- CN112058887A CN112058887A CN202010971111.2A CN202010971111A CN112058887A CN 112058887 A CN112058887 A CN 112058887A CN 202010971111 A CN202010971111 A CN 202010971111A CN 112058887 A CN112058887 A CN 112058887A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
Abstract
The invention discloses a pneumatic fracturing strengthening multiphase extraction system for treating a polluted site, which comprises a fracturing system unit and a multiphase extraction system unit, wherein the fracturing system unit comprises an air compressor, an air heater, a fracturing well and an injection pipe, the outlet end of the air compressor is connected with the inlet end of the air heater, the fracturing well extends to a region below a liquid-phase pollution source, the lower end of the fracturing well is closed, a plurality of air outlet gaps which are arranged at intervals are arranged along the length direction of the fracturing well, the inlet end of the injection pipe is connected with the outlet end of the air heater, and the outlet end of the injection pipe extends into the fracturing well and is used for injecting heated air into the fracturing well and permeating into polluted soil from the corresponding air outlet gap. The invention utilizes the pneumatic fracturing to crack the stratum, improves the air permeability of the unsaturated zone, changes the permeability, the hydraulic conductivity and the like of the aquifer, can improve the saturated vapor pressure of the volatile pollutants in the zone by hot air flowing through, promotes the volatilization of the volatile pollutants, and greatly improves the extraction efficiency of MPE.
Description
Technical Field
The invention relates to the technical field of polluted site restoration, in particular to a pneumatic fracturing reinforced multiphase extraction system for polluted site treatment.
Background
The multiphase extraction (MPE) is an environment-friendly soil and underground water remediation technology, has small disturbance to the ground environment, is suitable for various polluted sites such as gas stations, petrochemical enterprises, chemical enterprises and the like, and is particularly suitable for remediation of polluted soil and underground water with non-aqueous phase liquid pollutants (NAPL). The method has the advantages of high repair efficiency, large influence area, wide application range and the like.
In general, the MPE technology simultaneously extracts soil gas, underground water, and NAPL from an underground polluted region to the ground by using vacuum and/or water pump extraction, and performs multiphase separation and treatment to treat the polluted soil and underground water. The MPE technology has the functions of soil vapor extraction and underground water pumping treatment, but also has corresponding technical defects. For example, poorly permeable geological conditions (range of applicability permeability coefficient Kf: 10)-3～10-5cm/s); the extraction effect of the contaminants is limited when the saturated vapor pressure is too low (saturated vapor pressure < 0.5mm Hg); when single-pump vacuum extraction is performed, because air extraction and liquid extraction are required to be performed simultaneously, the extraction efficiency is lower compared with that of a single gas or liquid extraction system. Such problems have largely limited MPE technology to site remediation where permeability is poor and contamination is complex. Therefore, it is necessary to develop a new repair technology to improve the repair effect of the MPE site in situ.
The patent document of application publication No. CN104624623A discloses a contaminated site in-situ extraction and restoration method, which comprises investigation, well arrangement, fracturing and extraction, wherein after the well arrangement is completed, mortar mixed liquid is pumped into soil at high pressure in a fracturing mode to form soil layer cracks, then sand layers are formed at different heights of a well, the permeability of cohesive soil is increased, the in-situ extraction speed is accelerated, and therefore the extraction and restoration effect is improved. However, the method needs to pump mortar into the stratum, which causes great disturbance to the stratum, relatively complicated operation increases labor capacity, and the distance of grouting and fracturing gaps is relatively short, which is not beneficial to the cost control of large-area site repair.
Therefore, there is a need to develop an in-situ multiphase extraction and remediation system for contaminated sites with poor permeability and complex contamination conditions, so as to improve the problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a pneumatic fracturing reinforced multiphase extraction system, which utilizes pneumatic fracturing to inject high-pressure hot air into a stratum so as to generate cracks in the stratum to increase gas and liquid flow channels, thereby accelerating the extraction and recovery of polluted gas, underground water and NAPL and having small disturbance to the stratum.
The invention adopts the following technical scheme:
the utility model provides a heterogeneous extraction system of pneumatic fracturing reinforcement for polluting place is administered, including set up in the fracturing system unit and the heterogeneous system unit of extracting in the contaminated site, fracturing system unit includes air compressor, air heater, fracturing well and injection tube, air compressor's exit end with air heater entrance connection, the fracturing well extends to the following region of liquid phase pollution source, and its lower extreme seals, follows be equipped with a plurality of air-out gaps that are the interval setting on the fracturing well length direction, the entry end of injection tube with the air heater exit end is connected, the exit end of injection tube extends to in the fracturing well for air after will heating is injected into in the fracturing well, and by corresponding in the air-out gap permeates to contaminated soil. .
The outlet end that is close to the injection pipe is equipped with two at least separation gasbags that are the interval setting in length direction, adjacent two separate between the gasbag be equipped with the air-out nozzle on the injection pipe, separate behind the gasbag gas injection with the inner wall of fracturing well is sealed laminating, air-out nozzle on the injection pipe with separate between two adjacent separation gasbags air-out gap on the fracturing well is linked together.
The interval of air outlet gaps on the fracturing well is 0.2-0.9 m, the injection pressure of gas in the fracturing well is 0.5-2 Mpa, and the injection flow is 20-50L/min.
Furthermore, the fracturing system unit also comprises an air pressure/flow regulator, and two ends of the air pressure/flow regulator are respectively connected with the air compressor and the air heater.
The multiphase extraction system unit comprises an extraction well, an extraction pipe and a water treatment unit, wherein the lower end of the extraction well extends into an area below a liquid-phase pollution source, the lower area of the extraction well is of a sieve pipe structure, and the sieve pipe structure is arranged in a saturated area and an unsaturated area of polluted soil; the extraction pipe is arranged in the extraction well, the upper end of the extraction pipe is connected with the water treatment unit, and the inlet end of the lower end of the extraction pipe is arranged at the sieve tube structure of the extraction well and used for simultaneously extracting gas phase pollutants in a non-saturated area and liquid phase pollutants in a saturated area.
Preferably, the inlet end of the extraction pipe is of a sawtooth V-shaped or inclined notch structure, and the inlet end of the extraction pipe is partially immersed in liquid phase pollutants in a saturation area.
And furthermore, a liquid level meter probe is arranged at the lower end of the extraction pipe and used for detecting the liquid level surface layer of the liquid phase pollutants in the saturated area, so that the lower end of the extraction pipe is flush with the liquid level of the liquid phase pollutants in the saturated area.
The water treatment unit comprises a gas-liquid separation tank, a vacuum pump, an activated carbon tank, an oil-water separator, an oil storage tank, a water storage tank and a water treatment device, wherein the outlet end of the extraction pipe is communicated with the gas-liquid separation tank, the gas phase outlet of the gas-liquid separation tank is communicated with the suction port of the vacuum pump through a pipeline, the outlet of the vacuum pump is communicated with the inlet of the activated carbon tank through a pipeline, and the outlet of the activated carbon tank is communicated with the external atmosphere; and liquid in the gas-liquid separation tank is pumped into the oil-water separator through a first sewage pump, a water-insoluble pollutant outlet of the oil-water separator is communicated with the oil storage tank, a water phase outlet of the oil-water separator is connected to the water storage tank through a pipeline, and when the liquid reaches a certain liquid level, the liquid is pumped into the water treatment device through a second sewage pump for treatment and discharge.
And the extraction pipe positioned at the wellhead of the extraction well is also provided with a vacuum pressure meter and a flow meter which are used for detecting the negative pressure and the flow of the wellhead of the extraction well.
The multiphase extraction system also comprises a control device which is respectively electrically connected with the fracturing system unit and the execution ends in the multiphase extraction system unit, and the control device controls the operation of each execution end through a PLC control program.
The technical scheme of the invention has the following advantages:
A. the pneumatic fracturing reinforced multiphase extraction system provided by the invention utilizes the air compressor to generate compressed air, then the air is heated by the air heater and then is quickly conveyed into a specified stratum, the stratum is cracked by pneumatic fracturing, the air permeability of an unsaturated zone is improved, the permeability of an aquifer, the hydraulic conductivity and the like are changed, thus the extraction of the MPE to the polluted gas is improved, the extraction recovery of polluted underground water and NAPL in the aquifer is obviously improved, and the restoration of the saturated zone is effectively enhanced; meanwhile, high-pressure air injected into the stratum is heated, and hot air flows through the high-pressure air to improve the saturated vapor pressure of volatile pollutants in the area and promote the volatilization of the volatile pollutants; and simultaneously, the viscosity of NAPL can be reduced, and the fluidity of NAPL can be increased, so that the MPE extraction efficiency can be greatly improved.
B. The length of the fracturing well can be designed according to the depth of a fractured stratum as required, and the fracture is formed at intervals of 0.2-0.9 m, or the fracture intervals can be designed according to the structure of the stratum. The injection pipe is arranged in a fracturing well pipe, the injection nozzle is arranged at the cracking position of the fracturing well and is separated by a separation air bag, high-pressure air injection is carried out after the injection nozzle is arranged, a soil layer at the position is cracked under the action of high-pressure air, and the single injection time lasts for 15-20 seconds. After fracturing of a certain area is completed, the separating air bag is deflated, and the injection nozzle can be lowered to the slotting position of the next fracturing well until pneumatic fracturing of the stratum at the slotting position of all the fracturing wells is completed. The invention adopts the local gas injection of the centralized fracturing well, the gas flow pressure is large, the fracturing effect is good, the high-pressure hot gas injection can obviously improve the volatilization of pollutants in the area, the viscosity of NAPL is reduced to flow, and the soil is repaired more thoroughly.
C. The pneumatic fracturing reinforced multiphase extraction system provided by the invention is simple and convenient to operate, has a good treatment effect, has the characteristics of high efficiency and accuracy in repairing low-permeability polluted sites, and can be additionally provided with other devices according to the complexity of the polluted sites.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings which are needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained from the drawings without inventive labor to those skilled in the art.
FIG. 1 is a schematic diagram of a pneumatic fracturing enhanced multi-phase extraction system repair system provided by the present invention;
FIG. 2 is a schematic diagram of the injection tube and fractured well of FIG. 1;
fig. 3 is a schematic view of the structure of the extraction tube of fig. 1.
The labels in the figure are as follows:
1-a fracturing system unit;
11-an air compressor, 12-an air heater, 13-a fracturing well, 131-an air outlet gap,
14-an injection pipe, 141-an air outlet nozzle and 15-a separation air bag; 16-air pressure/flow regulator
2-multiphase extraction System Unit
21-extraction well, 211-sieve tube structure, 22-extraction tube
23-Water treatment Unit
231-gas-liquid separation tank, 232-vacuum pump, 233-activated carbon tank, 234-oil-water separator
235-water storage tank, 236-oil storage tank, 237-water treatment device, 238-first sewage pump
239-a second sewage pump;
3-vacuum pressure gauge; 4-flow meter; 5-a control device; 6-an inflator pump; 7-inflation tube.
A-a saturation region; b-unsaturated region.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the pneumatic fracturing strengthening multiphase extraction system for treating a contaminated site provided by the invention comprises a fracturing system unit 1 and a multiphase extraction system unit 2 which are arranged on the contaminated site, wherein the fracturing system unit 1 comprises an air compressor 11, an air heater 12, a fracturing well 13 and an injection pipe 14, the outlet end of the air compressor 11 is connected with the inlet end of the air heater 12, the fracturing well 13 extends to a region below a liquid-phase pollution source, the lower end of the fracturing well 13 is closed, and a plurality of air outlet gaps 131 which are arranged at intervals are arranged along the length direction of the fracturing well 13, as shown in fig. 2; the inlet end of the injection pipe 14 is connected with the outlet end of the air heater 12, and the outlet end of the injection pipe 14 extends into the fracturing well 13 and is used for injecting heated air into the fracturing well 13. The heated pressure airflow permeates the polluted soil from the air outlet gap 131 of the fracturing well 13, and the permeability of the low-permeability soil is improved through airflow fracturing, so that the extraction efficiency is improved.
The invention injects high-pressure hot air into the stratum by utilizing pneumatic fracturing to generate cracks in the stratum and increase gas and liquid flow channels, thereby accelerating the extraction and recovery of polluted gas, underground water and NAPL. Meanwhile, the system heats high-pressure air injected into the stratum, and when hot air enters the polluted stratum, the saturated vapor pressure of volatile pollutants in the area can be improved, the volatilization of the volatile pollutants is promoted, meanwhile, the viscosity of NAPL can be reduced, the fluidity of NAPL is increased, and therefore the MPE extraction efficiency can be greatly improved.
In order to more effectively repair the polluted area, as shown in fig. 2, at least two separation air bags 15 which are arranged at intervals in the length direction are further arranged at the outlet end close to the injection pipe 14, an air outlet nozzle 141 is arranged on the injection pipe 14 between two adjacent separation air bags 15, preferably, the invention injects air into each separation air bag 15 through the inflation pipe 7 by the inflator pump 6, the separation air bags are in sealing joint with the inner wall of the fracturing well 13 after being injected with air, the air outlet nozzle 141 on the injection pipe 14 is communicated with the air outlet gap 131 on the fracturing well 13 which is separated between two adjacent separation air bags 15, namely, high-pressure concentrated gas injection is carried out on a polluted soil layer with a certain depth, the pollutants in the area are promoted to be rapidly volatilized and the liquid-phase pollutants flow, the separation air bag 15 is gradually moved along the depth direction of the fracturing well until the pneumatic fracturing of the stratum at the seam of all the fracturing wells is completed.
In the pneumatic fracturing system unit 1, an air compressor 11 provides compressed air for the system, the air injected into a polluted stratum is subjected to pressure and flow regulation through an air pressure/flow regulator 16, the injection pressure is usually set to be 0.5-2 Mpa, the injection flow is usually set to be 20-50L/min, and the air can be regulated according to the geological characteristics of the stratum and the injection depth in actual engineering. The air heater 12 is connected to an air pressure/flow regulator 16 to heat the air injected into the formation, typically at a temperature of 50-300 degrees for volatile organic contaminants such as: benzene series, halogenated hydrocarbons, or semi-volatile organics: polycyclic aromatic hydrocarbons and the like, but specific target temperatures need to be set according to actual site conditions and by comprehensive consideration of economic factors, and detailed description is omitted.
When one end of the air outlet nozzle 141 below the injection pipe 14 extends into the fracturing well 13, the injection pipe 14 is hermetically connected with the fracturing well 13 at the well head, the other end of the injection pipe 14 is connected to a pipeline connecting port of the air heater 12, and the pipeline is provided with a pressure gauge 3 and a flow meter 4 for detecting the gas pressure and flow in the injection pipe 14. As shown in FIG. 2, the fracturing well 13 adopted by the invention is a slotted pipe, the interval of the air outlet gaps 131 is generally 0.2 m-0.9 m, and the interval can also be designed according to the stratum structure. The air outlet slit 131 of the pipeline slit must ensure the physical strength of the corresponding pipeline material to prevent the pipeline from being broken due to too dense pipeline slit or too large injection air pressure. The upper end and the lower end of the air outlet nozzle 141 of the injection pipe 14 are provided with the separation air bags 15, when the air outlet nozzle 141 extends into the air outlet gap 131 of the fracturing well 13 along the pipeline, the two separation air bags 15 are inflated by the inflator pump 6 until the air bags expand to separate the fracturing well pipeline up and down. After the setting is finished, high-pressure air injection is carried out, so that cracks are generated on corresponding soil layers under the action of high-pressure hot gas, and the single injection time lasts for 15-20 seconds generally.
The multiphase extraction system unit 2 comprises an extraction well 21, an extraction pipe 22 and a water treatment unit 23, wherein the lower end of the extraction well 21 extends into an area below a liquid phase pollution source, the lower area of the extraction well 21 is a sieve pipe structure 211, and the sieve pipe structure 211 is arranged in a saturated area A and a non-saturated area B of polluted soil; the extraction pipe 22 is placed in the extraction well 21, the upper end of the extraction pipe 22 is connected with the water treatment unit 23, and the inlet end of the lower end of the extraction pipe is arranged at the sieve tube structure 211 of the extraction well 21 for simultaneously extracting gas-phase and liquid-phase pollutants.
The water treatment unit 23 comprises a gas-liquid separation tank 231, a vacuum pump 232, an activated carbon tank 233, an oil-water separator 234, a water storage tank 235, an oil storage tank 236 and a water treatment device 237, the outlet end of the extraction pipe 22 is communicated with the gas-liquid separation tank 231, the gas phase outlet of the gas-liquid separation tank 231 is communicated with the suction port of the vacuum pump 232 through a pipeline, the outlet of the vacuum pump 232 is communicated with the inlet of the activated carbon tank 233 through a pipeline, and the outlet of the activated carbon tank 233 is communicated with the outside atmosphere; the liquid in the gas-liquid separation tank 231 is pumped into the oil-water separator 234 through the first sewage pump 238, the water-insoluble pollutant outlet of the oil-water separator 234 is communicated with the oil storage tank 236, the water phase outlet of the oil-water separator 234 is connected to the water storage tank 235 through a pipeline, and when the liquid reaches a certain liquid level, the liquid is pumped into the water treatment device 237 through the second sewage pump 239 for treatment and discharge. Preferably, the extraction pipe 22 at the wellhead of the extraction well 21 is also provided with a pressure gauge 3 and a flow gauge 4 for detecting the negative pressure and flow at the wellhead of the extraction well 21.
The multiphase extraction system unit 2 generates negative pressure by using a vacuum pump and simultaneously extracts gas, underground water and NAPL from the polluted soil. One end of the extraction pipe 22 is connected to the extraction well 21 of the contaminated soil, and the other end is connected to a pipe connection port of the gas-liquid separation tank 231. The lower end of the extraction pipe 22 extending into the extraction well 21 is preferably provided with a saw-tooth V-shaped or inclined cut structure, part of the V-shaped or inclined cut structure is immersed below the liquid level, and part of the V-shaped or inclined cut structure is remained on the liquid level, so that the extraction liquid and the gas can be simultaneously treated to the ground. In order to make an accurate judgment on the underground liquid level in real time, as shown in fig. 3, the invention may further include a liquid level meter probe (not shown) arranged at a bottom parallel position of the extraction pipe 22, and when the liquid level drops, the extraction pipe may be adjusted to the surface of the liquid level according to the monitoring data of the liquid level meter probe, so as to ensure that the gas phase in the unsaturated region B and the liquid phase pollutant in the saturated region a can be extracted simultaneously in the whole extraction process.
Of course, the invention also provides a control device 5 in the multiphase extraction system, which is electrically connected with the execution ends in the fracturing system unit 1 and the multiphase extraction system unit 2, and the control device 5 controls the operation of each execution end through a PLC control program.
The multiphase pollutants extracted by the vacuum pump 232 under negative pressure firstly enter the gas-liquid separation tank 231 for separating and extracting gas and liquid, the gas and the liquid are separated by the oil-water separator 234, the gas enters the activated carbon tank 233 for treatment and discharge after reaching the standard, and the liquid enters the oil-water separator 234 for treatment. When the liquid level in the gas-liquid separation tank 231 reaches the control height according to the liquid level controller provided in the gas-liquid separation tank 231, the first sewage pump 238 is controlled to discharge the liquid by the automatic control device 5.
The oil-water separator 234 is used for separating the extracted oil and water, the separated oil phase enters the oil storage tank 236 for subsequent utilization or treatment, the water firstly enters the water storage tank 235, the built-in liquid level controller is arranged in the water storage tank 235, and when the liquid level reaches the control height, the control device 5 automatically controls the second sewage pump 239 to start to pump the water into the water treatment device 237 for treatment. The water treatment device 237 can be designed according to pollution property and extraction concentration, and can select one or more combinations of activated carbon adsorption, air stripping treatment and biological treatment, and the treated water reaches the standard and is discharged or recycled.
The multiphase extraction system unit 2 of the invention utilizes an automatic control device (such as a PLC control device) to set a control program, and automatically controls the operation of each device, including timing on-off of an extraction system, flow regulation, pressure regulation, on-off of a vacuum pump and the like. Monitoring equipment for monitoring parameters such as vacuum degree, underground water depth, extraction flow, fluid temperature and the like is further arranged in the pipeline and the extraction well 21, for example, a flow meter 4 and a vacuum pressure meter 3 for measuring the flow and the pressure in the extraction pipe are arranged at the wellhead position of the extraction well, and the monitored data can be transmitted to a control panel of the PLC control device, so that the change of each parameter can be conveniently checked, and the system adjustment is carried out.
The pneumatic fracturing operation of the present invention may be performed intermittently or simultaneously with the multiphase extraction operation depending on site conditions. The multiphase extraction system pumps volatile organic compounds and semi-volatile organic compounds in the polluted soil, NAPL and underground water into each device through an extraction pipe connected with an extraction well by negative pressure generated by a vacuum pump, and the volatile organic compounds and the semi-volatile organic compounds, NAPL and the underground water respectively enter corresponding purification treatment after passing through a gas-liquid separation tank and an oil-water separator. When the V-shaped or inclined opening part at the lower end of the extraction pipe is immersed below the polluted liquid level, when the NAPL phase thickness monitored by the liquid level gauge probe exceeds the set maximum limit value, the extraction system is opened to start extracting the NAPL and the gas phase in the polluted soil, and when the oil phase thickness is lower than the set minimum limit value, the extraction system is closed, and the system stops extraction work. When peripheral NAPL flows back to the extraction well through hydraulic gradient or pressure gradient and the oil phase thickness is recovered to the maximum limit value set by the system, the extraction system is started again for extraction treatment, and the circulation is repeated until the extraction of NAPL phase pollutants is completed.
The devices and pumps, pressure meters, flow meters, etc. of the water treatment unit 23 are commercially available products, and are not described herein.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (10)
1. The pneumatic fracturing strengthening multiphase extraction system for treating the polluted site comprises a fracturing system unit (1) and a multiphase extraction system unit (2) which are arranged on the polluted site, and is characterized in that the fracturing system unit (1) comprises an air compressor (11), an air heater (12), a fracturing well (13) and an injection pipe (14), the outlet end of the air compressor (11) is connected with the inlet end of the air heater (12), the fracturing well (13) extends to the area below a liquid-phase pollution source, the lower end of the fracturing well is closed, a plurality of air outlet gaps (131) which are arranged at intervals are arranged in the length direction of the fracturing well (13), the inlet end of the injection pipe (14) is connected with the outlet end of the air heater (12), the outlet end of the injection pipe (14) extends into the fracturing well (13) and is used for injecting heated air into the fracturing well (13), and the air is permeated into the polluted soil through the corresponding air outlet gaps (131).
2. The pneumatic fracturing reinforcement multiphase extraction system for contaminated site treatment according to claim 1, wherein at least two separation air bags (15) are arranged close to the outlet end of the injection pipe (14) at intervals in the length direction, an air outlet nozzle (141) is arranged on the injection pipe (14) between every two adjacent separation air bags (15), the separation air bags (15) are hermetically attached to the inner wall of the fracturing well (13) after being injected with air, and the air outlet nozzle (141) on the injection pipe (14) is communicated with an air outlet gap (131) on the fracturing well (13) between every two adjacent separation air bags (15).
3. The pneumatic fracturing reinforced multiphase extraction system for treating the polluted site as claimed in claim 2, wherein the interval of the air outlet gaps (131) on the fracturing well (13) is 0.2-0.9 m, the injection pressure of gas in the fracturing well is 0.5-2 Mpa, and the injection flow rate is 20-50L/min.
4. The pneumatic fracturing-enhanced multiphase extraction system for contaminated site remediation of claim 3, wherein the fracturing system unit (1) further comprises an air pressure/flow regulator (16), and two ends of the air pressure/flow regulator (16) are respectively connected with the air compressor (11) and the air heater (12).
5. The pneumatic fracturing reinforced multiphase extraction system for polluted site treatment according to any one of claims 1 to 4, wherein the multiphase extraction system unit (2) comprises an extraction well (21), an extraction pipe (22) and a water treatment unit (23), the lower end of the extraction well (21) extends into the area below a liquid phase pollution source, the lower area of the extraction well (21) is a sieve pipe structure (211), and the sieve pipe structure (211) is arranged in a saturated area (A) and a non-saturated area (B) of polluted soil; the extraction pipe (22) is arranged in the extraction well (21), the upper end of the extraction pipe (22) is connected with the water treatment unit (23), and the inlet end of the lower end of the extraction pipe is arranged at a sieve pipe structure (211) of the extraction well (21) and used for simultaneously extracting gas phase in a non-saturation area (B) and liquid phase pollutant in a saturation area (A).
6. The pneumatic fracturing reinforced multiphase extraction system for contaminated site remediation of claim 5, wherein the inlet end of the extraction pipe (22) is of a zigzag or chamfered structure, and the inlet end part of the extraction pipe is immersed in the liquid phase contaminants in the saturation region (A).
7. The pneumatic fracturing reinforced multiphase extraction system for contaminated site remediation of claim 6, wherein the lower end of the extraction pipe (22) is provided with a liquid level gauge probe for detecting the liquid level surface layer of the liquid phase contaminant in the saturation region (A) so that the lower end of the extraction pipe (22) is kept flush with the liquid level of the liquid phase contaminant in the saturation region (A).
8. The pneumatic fracturing reinforced multiphase extraction system for contaminated site remediation according to claim 7, wherein the water treatment unit (23) comprises a gas-liquid separation tank (231), a vacuum pump (232), an activated carbon tank (233), an oil-water separator (234), an oil storage tank (235), a water storage tank (236) and a water treatment device (237), the outlet end of the extraction pipe (22) is communicated with the gas-liquid separation tank (231), the gas phase outlet of the gas-liquid separation tank (231) is communicated with the suction port of the vacuum pump (232) through a pipeline, the outlet of the vacuum pump (232) is communicated with the inlet of the activated carbon tank (233) through a pipeline, and the outlet of the activated carbon tank (233) is communicated with the outside atmosphere; liquid in the gas-liquid separation tank (231) is pumped into the oil-water separator (234) through a first sewage pump (238), a water-insoluble pollutant outlet of the oil-water separator (234) is communicated with the oil storage tank (236), a water phase outlet of the oil-water separator (234) is connected to a water storage tank (235) through a pipeline, and when a certain liquid level is reached, the liquid is pumped into the water treatment device (237) through a second sewage pump (239) for treatment and discharge.
9. The pneumatic fracturing reinforcement multiphase extraction system for contaminated site remediation according to claim 8, wherein a vacuum pressure gauge (3) and a flow meter (4) are further arranged on the extraction pipe (22) at the wellhead of the extraction well (21) and are used for detecting the negative pressure and the flow of the wellhead of the extraction well (21).
10. The pneumatic fracturing reinforced multiphase extraction system for contaminated site remediation of claim 1, further comprising a control device (5) electrically connected to the execution ends of the fracturing system unit (1) and the multiphase extraction system unit (2), respectively, wherein the control device (5) controls the operation of each execution end through a PLC control program.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010971111.2A CN112058887B (en) | 2020-09-15 | 2020-09-15 | Pneumatic fracturing strengthening multiphase extraction system for pollution site treatment |
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| CN202010971111.2A CN112058887B (en) | 2020-09-15 | 2020-09-15 | Pneumatic fracturing strengthening multiphase extraction system for pollution site treatment |
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| CN112058887A true CN112058887A (en) | 2020-12-11 |
| CN112058887B CN112058887B (en) | 2021-10-08 |
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| CN114769300A (en) * | 2021-10-11 | 2022-07-22 | 苏州精英环保有限公司 | Water and soil in-situ integrated restoration well system for low-permeability polluted site |
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