CN117443919A - Soil and groundwater reinforced multiphase extraction equipment and method - Google Patents
Soil and groundwater reinforced multiphase extraction equipment and method Download PDFInfo
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- CN117443919A CN117443919A CN202311313550.4A CN202311313550A CN117443919A CN 117443919 A CN117443919 A CN 117443919A CN 202311313550 A CN202311313550 A CN 202311313550A CN 117443919 A CN117443919 A CN 117443919A
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- 238000000605 extraction Methods 0.000 title claims abstract description 84
- 239000002689 soil Substances 0.000 title claims abstract description 38
- 239000003673 groundwater Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 81
- 238000000926 separation method Methods 0.000 claims abstract description 45
- 238000007710 freezing Methods 0.000 claims abstract description 43
- 230000008014 freezing Effects 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 42
- 239000007924 injection Substances 0.000 claims abstract description 42
- 239000008346 aqueous phase Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 60
- 239000007789 gas Substances 0.000 claims description 48
- 239000002351 wastewater Substances 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 17
- 239000012530 fluid Substances 0.000 claims description 10
- 239000012267 brine Substances 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 6
- 239000012071 phase Substances 0.000 claims description 5
- 239000002912 waste gas Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 11
- 230000008439 repair process Effects 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 230000035699 permeability Effects 0.000 abstract description 3
- 238000005067 remediation Methods 0.000 abstract description 3
- 238000002955 isolation Methods 0.000 abstract 1
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- 238000004581 coalescence Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
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- 238000001179 sorption measurement Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000011045 prefiltration Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
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- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a soil and groundwater reinforced multiphase extraction device and a method, and relates to the technical field of soil and groundwater remediation. The invention comprises a freezing module and a multiphase extraction module, wherein the freezing module comprises a plurality of injection wells, a freezing liquid injection assembly is connected above the injection wells through pipelines, and a freezing liquid storage tank is connected to the freezing liquid injection assembly; the multiphase extraction module comprises a plurality of extraction wells, wherein a vacuum pump is arranged above the extraction wells through pipelines, and the vacuum pump is connected with a gas-liquid separation assembly through corresponding pipelines. The invention can effectively implement isolation of the repair area and the non-repair area, can realize freezing expansion of low permeability soil, increases the porosity among soil particles, reduces the adhesion of non-aqueous phase liquid, realizes thorough removal of pollutants, and can effectively and independently control each injection well and extraction well, thereby realizing accurate control and saving energy.
Description
Technical Field
The invention relates to the technical field of soil and groundwater remediation, in particular to a soil and groundwater reinforced multiphase extraction device and a method.
Background
The multiphase extraction technology is an in-situ soil groundwater remediation technology, and is characterized in that vacuum is applied to a multiphase extraction well installed underground, and soil gas, polluted groundwater and water-insoluble free phase (if any) in an underground gas-wrapping zone and a saturated zone are extracted to the ground, and then are treated by a ground treatment facility and then discharged or treated in the next step. The applicable target pollutant types comprise volatile organic pollutants, biodegradable semi-volatile organic pollutants, recyclable water-insoluble fluids and the like, and the application is wide.
The prior patent (publication number: CN 104874592B) discloses an in-situ multiphase extraction system of polluted soil, which is difficult to completely remove pollutants attached to soil particles due to small pores of the soil particles when the system is used in cohesive soil with poor permeability, and limits the use scene of the multiphase extraction technology.
Disclosure of Invention
The invention aims to provide a soil and groundwater reinforced multiphase extraction device and a method, which can increase the porosity among soil particles and reduce the adhesion of nonaqueous phase liquid by freezing.
In order to achieve the above purpose, the present invention provides the following technical solutions: the soil and underground water reinforced multiphase extraction equipment comprises a freezing module and a multiphase extraction module, wherein the freezing module comprises a plurality of injection wells, a freezing liquid injection assembly is connected above the injection wells through pipelines, and a freezing liquid storage tank is connected to the freezing liquid injection assembly;
the multiphase extraction module comprises a plurality of extraction wells, a vacuum pump is arranged above the extraction wells through pipelines, the vacuum pump is connected with a gas-liquid separation assembly through corresponding pipelines, a gas phase outlet of the gas-liquid separation assembly is connected with a gas extraction fan through a pipeline, and an outlet of the gas extraction fan is connected with a tail gas treatment assembly;
the liquid phase outlet of the gas-liquid separation assembly is connected with an oil-water separation assembly through a pipeline, one outlet of the oil-water separation assembly is connected with a non-aqueous phase liquid recovery assembly through a pipeline, and the other outlet of the oil-water separation assembly is connected with a wastewater recovery assembly through a pipeline.
Further, the surfaces of the injection well and the extraction well are provided with heat insulation layers.
Further, the chilled liquid injection assembly includes an automatic temperature monitor and an injection pump.
Further, the refrigerating fluid storage tank stores refrigerating fluid, and the refrigerating fluid is one of refrigerating brine or liquid nitrogen.
Further, an automatic tail gas monitor is arranged on a connecting pipeline between the air extraction fan and the tail gas treatment assembly.
Further, an automatic tail gas monitor is arranged at the exhaust port of the tail gas treatment assembly.
Further, a water quality automatic monitor is arranged between the oil-water separation assembly and the wastewater recovery assembly.
Further, an automatic water quality monitor is arranged at the outlet of the wastewater recovery component.
Further, the device also comprises a control device which is respectively and electrically connected with the execution ends in the freezing module and the multiphase extraction module, and the control device controls the operation of each execution end through a PLC control program.
According to one aspect of the invention, the invention provides a method for using soil and groundwater reinforced multiphase extraction equipment, which comprises the following specific steps:
s1, arranging injection wells and extraction wells at a certain interval in a construction area, and arranging an insulating layer on the surface to reduce heat exchange with the atmosphere;
s2, starting the freezing module to enable the freezing liquid injection assembly to operate, injecting liquid nitrogen or freezing brine in the freezing liquid storage tank into the boundary of the restoration area, freezing soil in the boundary area, blocking the connection between the restoration area and surrounding soil and groundwater, reducing the unnecessary extraction amount of pore air and groundwater, and saving the restoration cost;
s3, starting the multiphase extraction module, enabling the vacuum pump to operate to perform first extraction in the extraction well of the repair area, extracting the non-aqueous phase-containing liquid, underground water and pore air, separating waste water and waste gas through the gas-liquid separation assembly, conveying the waste gas to the tail gas treatment assembly for treatment, conveying the waste water to the oil-water separation assembly for treatment, recovering the non-aqueous phase liquid (oil), and closing the multiphase extraction module when the flow of the extraction gas and the liquid is reduced;
s4, restarting the freezing module, and injecting liquid nitrogen or frozen brine into the repairing area through the injection well to freeze and expand soil in the area;
s5, restarting the multiphase extraction module, treating the extracted waste water and wastewater, recovering the non-aqueous phase liquid (oil), and closing the extraction system after the automatic monitoring results of the extraction gas and the liquid reach the standard.
The invention has at least the following beneficial effects:
1. the invention can effectively isolate the repair area from the non-repair area, can realize the freezing expansion of low permeability soil, increases the porosity among soil particles, reduces the adhesion of non-aqueous liquid and realizes the thorough removal of pollutants;
2. the invention can effectively and independently control each injection well and extraction well, and realize accurate control so as to save energy.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic plan view of an injection well and an extraction well according to the present invention.
Reference numerals:
1. an injection well; 2. a heat preservation layer; 3. a chilled liquid injection assembly; 4. a chilled liquid storage tank; 5. an extraction well; 6. a vacuum pump; 7. a gas-liquid separation assembly; 8. an air extraction fan; 9. a tail gas treatment assembly; 10. an oil-water separation assembly; 11. a non-aqueous liquid recovery assembly; 12. a wastewater recovery assembly; 13. an automatic tail gas monitor; 14. an automatic water quality monitor.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments in this disclosure without inventive faculty, are intended to fall within the scope of this disclosure.
Referring to fig. 1-2, the present invention provides a technical solution: the soil and underground water reinforced multiphase extraction equipment comprises a freezing module and a multiphase extraction module, wherein the freezing module comprises a plurality of injection wells 1, a refrigerating fluid injection assembly 3 is connected above the injection wells 1 through pipelines, and a refrigerating fluid storage tank 4 is connected to the refrigerating fluid injection assembly 3;
the frozen liquid injection assembly 3 comprises an automatic temperature monitor and an injection pump, the injection pump is connected with the frozen liquid storage tank 4 through a pipeline, the injection pump is started to inject frozen liquid into the boundary of the repair area, and the frozen liquid is one of frozen brine or liquid nitrogen.
When freezing the repair area, the temperature change of the injection area needs to be monitored, but the temperature cannot be directly measured, but can only be indirectly measured by means of heat exchange between cold and hot different objects and the characteristic that certain physical properties of the objects change along with different cold and hot degrees, the temperature of the objects is measured by a special instrument-thermometer, namely an automatic temperature monitor, and according to the technical scheme of the application, the automatic temperature monitor is preferably a thermocouple thermometer which is a temperature measuring instrument based on a thermoelectric effect, a thermocouple is used as a sensor, the measured temperature signal is converted into a potential signal, and a display instrument for measuring millivolt-level voltage signals is matched through a connecting wire to realize the temperature measurement.
The multiphase extraction module comprises a plurality of extraction wells 5, a vacuum pump 6 is arranged above the extraction wells 5 through pipelines, the vacuum pump 6 is connected with a gas-liquid separation assembly 7 through corresponding pipelines, a gas phase outlet of the gas-liquid separation assembly 7 is connected with a gas extraction fan 8 through a pipeline, and an outlet of the gas extraction fan 8 is connected with a tail gas treatment assembly 9.
The gas-liquid separation assembly 7 is preferably a gas-liquid separator, the gas-liquid separator adopts the principles of centrifugal separation and silk screen filtration to realize a separation device for removing liquid, and mainly comprises a barrel, a cyclone separator, a high-efficiency foam breaking net, a blow-down valve and other main components, and is generally arranged in front of a drying device to realize coarse filtration to remove part of water in the air so as to reduce the workload of the drying device.
The gas-liquid separator adopts a plurality of separation structures, and the separation method comprises gravity sedimentation, baffling separation, centrifugal force separation, silk screen separation, ultrafiltration separation, filler separation and the like, and the gas-liquid separator adopts centrifugal separation aiming at the technical scheme of the application, and the main separation principle is as follows: since the density of the gas is different from that of the liquid, when the liquid and the gas are mixed together and flow, the centrifugal force to which the liquid is subjected is larger than that of the gas, so that the liquid tends to be centrifugally separated, and the liquid adheres to the separation wall surface and is collected downward by the action of gravity and discharged through the discharge pipe.
It should be noted that, install tail gas automatic monitor 13 on the connecting tube between air extraction fan 8 and the tail gas treatment subassembly 9, tail gas automatic monitor 13 is also installed to the gas vent department of tail gas treatment subassembly 9, is convenient for detect the tail gas that carries to in the tail gas treatment subassembly 9 and the tail gas after the processing, reaches the atmospheric emission standard rear and can directly discharge to among the atmospheric environment.
Further, the inside of tail gas treatment subassembly mainly is provided with active carbon adsorption net and dust filter screen, and the tail gas mainly is volatile organic compounds and granule dust, utilizes active carbon adsorption net can effectively adsorb volatile organic compounds, utilizes the dust filter screen to filter the granule dust.
Further, the tail gas automatic monitor 13 is preferably a photoionization detector, which can automatically upload real-time monitoring data, and the photoionization detector generates ultraviolet light by using a vacuum ultraviolet lamp (UV) with specific ionization energy (such as 10.6 eV), bombards gas molecules in an ionization chamber, ionizes and breaks organic molecules contained in the gas into positively charged ions and negatively charged electrons, and the ions and electrons impact on the polar plates under the action of an electric field of the polar plates, so that weak ion current can be detected. The ion current signals are amplified by a high-sensitivity micro-current amplifier, on one hand, the ion current signals are directly sent to a COM port of a computer after being sampled by a data acquisition card, and the measurement results are analyzed and processed by a chromatographic analysis platform; on the other hand, the data is amplified by a circuit and processed, and then sent to a display to display parameter values such as concentration, and the like, and the display mainly comprises a photoionization chamber, a microcurrent amplifier, a data acquisition unit and the like.
The liquid phase outlet of the gas-liquid separation assembly 7 is connected with an oil-water separation assembly 10 through a pipeline, one outlet of the oil-water separation assembly 10 is connected with a non-aqueous phase liquid recovery assembly 11 through a pipeline, and the other outlet is connected with a wastewater recovery assembly 12 through a pipeline.
Further, for the technical scheme of the application, the oil-water separation assembly 10 is preferably a QSYF series oil-water separator, which can remove and recover the dispersed oil and the emulsified oil in the oily sewage, so that the treated discharged water reaches or exceeds the integrated sewage discharge standard of GB 8978-96; the QSYF series oil-water separator mainly comprises an inclined plate separator, a high-efficiency water-oil separator (comprising a prefilter, a gravity separator, a high-efficiency coalescence separator and an adsorption filter) and corresponding matched devices, and the specific separation principle is as follows:
(1) The sewage is sent into the inclined plate separator through the sewage pump, the sewage pump has strong self-priming capability and uniform flow, has no side effect of mechanical shearing and emulsification on oil, and is suitable for conveying the oily sewage;
(2) The inclined plate separator can effectively remove floating oil and free oil in water, the floating oil rises to the surface of the separator and automatically flows into the sewage tank, and settled sludge is discharged periodically;
(3) The sewage treated by the inclined plate separator automatically flows into a buffer water tank, a liquid level switch is arranged on the water tank, the liquid level switch has high-level and low-level alarm functions, when the water level reaches a certain height, a sewage lifting pump is automatically started, when the water level drops to a certain position, the lifting pump is automatically stopped, and the sewage is sent into subsequent equipment such as a prefilter by the lifting pump for treatment;
(4) The prefilter can effectively filter fine suspended particles (10 mu m) in water, protect the high-efficiency coalescing separator, prolong the service life of the high-efficiency coalescing separator, and is used for removing impurity particles in the water, preventing the particles from being taken as cores and incapable of demulsification and oil removal, and meanwhile demulsifying oil in water and conveying the demulsified oil in water into the gravity separator;
(5) The gravity separator utilizes the characteristic of long flow path to ensure that fine oil particles are fully contacted, gradually grow up and float upwards, more than 80 percent of oil is gathered and discharged at the stage, and only a small amount of fine oil particles are conveyed into the final stage-high-efficiency coalescence separator, so that the gravity separator can greatly prolong the service life of the coalescence filter element;
(6) The high-efficiency coalescence separator is used for removing residual oil (emulsified oil) in water, the coalescence filter element coalesces micro oil drops in the water into large oil drops, the large oil drops float upwards rapidly and are collected in the oil collecting chamber of the coalescence separator, and the oil content in the treated water reaches <5mg/L and can be directly discharged; dirty oil collected in the oil collecting chamber is periodically discharged into the oil tank and recycled.
(7) The adsorption filter is internally provided with an active carbon filter core with large capacity, is used for deeply adsorbing and removing residual organic matters in water to enable the residual organic matters to reach the national emission standard, and the application range QSYF series oil-water separation equipment is a novel environment-friendly product which is pushed out according to the sewage characteristics of a finished oil depot, can be widely applied to the treatment of oily sewage generated by the operation of the light oil depot, comprises tank washing water of an oil tank area and oily sewage discharged during mechanical maintenance, and is suitable for the treatment of oily wastewater in steel factories, metallurgy, petrochemical industry, ships and cleaning industries.
The surfaces of the injection well 1 and the extraction well 5 are provided with heat insulation layers 2, so that heat exchange with the atmosphere is reduced conveniently.
An automatic water quality monitor 14 is arranged between the oil-water separation assembly 10 and the wastewater recovery assembly 12, the automatic water quality monitor 14 is arranged at the outlet of the wastewater recovery assembly 12, and the automatic water quality monitor 14 is utilized.
Further, the wastewater recovery component 12 is preferably an H i POx water treatment device, the wastewater contains high concentration organic pollutants, hydroxyl radicals are generated by combining ozone and hydrogen peroxide, the organic pollutants in the water are degraded into carbon dioxide and water, the pollutant concentration in the wastewater can reach the emission standard, and the similar treatment effect can be achieved by using persulfate to replace hydrogen peroxide.
Further, the automatic water quality monitor 14 is preferably a light scattering water quality analyzer, which works on the principle of measuring by utilizing the interference effect of light, has the advantages of providing accurate readings stably for a long time, and has the disadvantages of needing frequent calibration and maintenance equipment, and the optical water quality analysis can only generally measure some simple index parameters such as neutral and acidic substances and soluble salt substances of a water body.
For the technical scheme of this application, a soil and groundwater reinforce multiphase extraction equipment still includes controlling means, and it is electric connection with the execution end in freezing module and the multiphase extraction module respectively, and controlling means passes through the operation of each execution end of PLC control program control.
According to one aspect of the invention, the invention provides a method for using soil and groundwater reinforced multiphase extraction equipment, which comprises the following specific steps:
s1, arranging injection wells 1 and extraction wells 5 at a certain interval in a construction area, and arranging an insulating layer 2 on the surface to reduce heat exchange with the atmosphere;
s2, starting a freezing module to enable the freezing liquid injection assembly 3 to operate, injecting liquid nitrogen or freezing brine in the freezing liquid storage tank 4 into the boundary of the restoration area, freezing soil in the boundary area, blocking the connection between the restoration area and surrounding soil and groundwater, reducing the unnecessary extraction amount of pore air and groundwater, and saving restoration cost;
s3, starting the multiphase extraction module, enabling the vacuum pump 6 to operate to extract the non-aqueous phase liquid, the underground water and pore air in the recovery area extraction well 5 for the first time, separating the wastewater and the exhaust gas through the gas-liquid separation assembly 7, conveying the exhaust gas to the tail gas treatment assembly 9 for treatment, conveying the wastewater to the oil-water separation assembly 10 for treatment, recovering the non-aqueous phase liquid (oil), and closing the multiphase extraction module when the flow of the extraction gas and the liquid is reduced;
s4, restarting the freezing module, and injecting liquid nitrogen or frozen brine into the repairing area through the injection well 1 to freeze and expand soil in the area;
s5, restarting the multiphase extraction module, treating the extracted waste water and wastewater, recovering the non-aqueous phase liquid (oil), and closing the extraction system after the automatic monitoring results of the extraction gas and the liquid reach the standard.
In summary, the invention has the heat preservation layer 2 arranged on the pollution area needing extraction and repair for reducing the heat exchange with the atmosphere; then starting the freezing module to freeze soil and underground water from the periphery to the center of the repair area, so that the porosity among particles of the low-permeability soil expands along with the water icing process, and the porosity is increased; and then, independently controlling water flow and air flow in a plurality of extraction wells 5 through an intelligent PLC control device, additionally setting an automatic monitoring module for gas and water quality, independently stopping working of the extraction wells 5 for 24 hours when the monitoring result is qualified, then restarting and monitoring until the extraction wells 5 automatically stop working after the continuous two automatic detection results are qualified, and notifying field personnel in real time.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. When an element is referred to as being "mounted," "secured" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (10)
1. The soil and underground water reinforced multiphase extraction equipment comprises a freezing module and a multiphase extraction module, and is characterized in that the freezing module comprises a plurality of injection wells (1), a freezing liquid injection assembly (3) is connected above the injection wells (1) through pipelines, and a freezing liquid storage tank (4) is connected to the freezing liquid injection assembly (3);
the multiphase extraction module comprises a plurality of extraction wells (5), a vacuum pump (6) is arranged above the extraction wells (5) through pipelines, the vacuum pump (6) is connected with a gas-liquid separation assembly (7) through corresponding pipelines, a gas phase outlet of the gas-liquid separation assembly (7) is connected with an air suction fan (8) through a pipeline, and an outlet of the air suction fan (8) is connected with a tail gas treatment assembly (9);
the liquid phase outlet of the gas-liquid separation assembly (7) is connected with an oil-water separation assembly (10) through a pipeline, one outlet of the oil-water separation assembly (10) is connected with a non-aqueous phase liquid recovery assembly (11) through a pipeline, and the other outlet of the oil-water separation assembly is connected with a wastewater recovery assembly (12) through a pipeline.
2. The soil and groundwater enhanced multiphase extraction device of claim 1, wherein: the surfaces of the injection well (1) and the extraction well (5) are provided with heat preservation layers (2).
3. The soil and groundwater enhanced multiphase extraction device of claim 2, wherein: the chilled liquid injection assembly (3) comprises an automatic temperature monitor and an injection pump.
4. The soil and groundwater enhanced multiphase extraction device of claim 2, wherein: the refrigerating fluid storage tank (4) stores refrigerating fluid, and the refrigerating fluid is one of refrigerating brine or liquid nitrogen.
5. The apparatus of claim 4, wherein: an automatic tail gas monitor (13) is arranged on a connecting pipeline between the air extraction fan (8) and the tail gas treatment assembly (9).
6. The apparatus of claim 5, wherein: an automatic tail gas monitor (13) is arranged at the exhaust port of the tail gas treatment assembly (9).
7. The apparatus of claim 5, wherein: an automatic water quality monitor (14) is arranged between the oil-water separation assembly (10) and the wastewater recovery assembly (12).
8. The apparatus of claim 7, wherein: an automatic water quality monitor (14) is arranged at the outlet of the wastewater recovery assembly (12).
9. The apparatus of claim 7, further comprising a control device electrically connected to the execution ends of the freezing module and the multiphase extraction module, respectively, wherein the control device controls the operation of each execution end through a PLC control program.
10. The application method of the soil and groundwater reinforced multiphase extraction equipment is characterized by comprising the following specific steps:
s1, arranging injection wells (1) and extraction wells (5) at certain intervals in a construction area, and arranging an insulating layer (2) on the surface to reduce heat exchange with the atmosphere;
s2, starting the freezing module to enable the freezing liquid injection assembly (3) to operate, injecting liquid nitrogen or freezing brine in the freezing liquid storage tank (4) into the boundary of the restoration area, and realizing freezing of soil in the boundary area to obstruct connection between the restoration area and surrounding soil and groundwater;
s3, starting the multiphase extraction module, enabling the vacuum pump (6) to operate to extract the non-aqueous phase liquid, underground water and pore air in the recovery area extraction well (5) for the first time, separating waste water and waste gas through the gas-liquid separation assembly (7), conveying the waste gas to the tail gas treatment assembly (9) for treatment, conveying the waste water to the oil-water separation assembly (10) for treatment, recovering the non-aqueous phase liquid (oil), and closing the multiphase extraction module when the flow of the extraction gas and the flow of the liquid become smaller;
s4, restarting the freezing module, and injecting liquid nitrogen or frozen brine into the repairing area through the injection well (1) to freeze and expand the soil in the repairing area;
s5, restarting the multiphase extraction module, treating the extracted waste water and wastewater, recovering the non-aqueous phase liquid (oil), and closing the extraction system after the automatic monitoring results of the extraction gas and the liquid reach the standard.
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|---|---|---|---|
| CN202311313550.4A CN117443919A (en) | 2023-10-11 | 2023-10-11 | Soil and groundwater reinforced multiphase extraction equipment and method |
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| CN202311313550.4A CN117443919A (en) | 2023-10-11 | 2023-10-11 | Soil and groundwater reinforced multiphase extraction equipment and method |
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