Multiphase extraction equipment and system for treating polluted soil-underground water

Abstract

The invention relates to the technical field of soil pollution and water pollution treatment, in particular to multiphase extraction equipment and system for treating polluted soil-underground water. The multiphase extraction equipment for treating polluted soil-underground water comprises a first gas-liquid separator, a second gas-liquid separator and a third gas-liquid separator which are communicated in sequence, a first spiral flow guide structure is arranged in the first gas-liquid separator, a second spiral flow guide structure is arranged in the second gas-liquid separator, and a third spiral flow guide structure is arranged in the third gas-liquid separator; the rotating radius of the first spiral flow guide structure, the rotating radius of the second spiral flow guide structure and the rotating radius of the third spiral flow guide structure are gradually reduced, and the overflowing section area of the first spiral flow guide structure, the overflowing section area of the second spiral flow guide structure and the overflowing section area of the third spiral flow guide structure are gradually reduced. The problems that the current extraction treatment flow is small, the extraction treatment efficiency is low or the gas-liquid separation efficiency is low can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil pollution and water pollution treatment, and in particular to a multiphase extraction device and system for treating contaminated soil-groundwater. Background Art

[0002] Some policy measures have been taken to control, mitigate and eliminate the hazards caused by sudden environmental incidents, improve the risk management, emergency preparedness and emergency handling capabilities of sudden incidents. Among them, soil and groundwater pollution emergency remediation equipment is an important guarantee for the investigation and treatment of sudden pollution sites.

[0003] In order to extract volatile pollutants from the soil, relevant technologies have developed soil vapor extraction systems by allowing air to flow through soil saturated with hydrocarbons or other volatile organic compounds to volatilize these compounds. However, the existing equipment has a single function and cannot comprehensively solve the problems of soil and groundwater pollution control and remediation in complex environments, and cannot fully meet the current emergency rapid remediation needs of sudden environmental pollution sites.

[0004] Multiphase extraction technology is an in-situ soil and groundwater remediation technology that simultaneously extracts contaminated soil gas, contaminated groundwater and non-aqueous phase liquids in the underground aeration zone and saturated zone to the ground for treatment. It can be applied to a wide range of target pollutants in soil and groundwater, including volatile organic pollutants, biodegradable semi-volatile organic pollutants, etc. Traditional multiphase extraction equipment has poor gas-liquid separation effect, small extraction process flow rate, high energy consumption, and cannot meet actual application needs.

[0005] Therefore, there is an urgent need to find effective solutions to solve the above problems. Summary of the invention

[0006] In view of this, the present invention aims to solve at least one of the above technical problems to a certain extent. To this end, the present invention proposes a multiphase extraction device and system for treating contaminated soil-groundwater, which can at least alleviate the current problems of small extraction treatment flow rate, low gas-liquid separation efficiency or low extraction treatment efficiency, and is conducive to reducing energy consumption.

[0007] In order to solve the above technical problems, this application is implemented as follows:

[0008] According to an embodiment of the present invention, there is provided a multiphase extraction device for treating contaminated soil-groundwater, which includes a first gas-liquid separator, a second gas-liquid separator and a third gas-liquid separator which are connected in sequence;

[0009] A first spiral flow guide structure is provided inside the first gas-liquid separator, a second spiral flow guide structure is provided inside the second gas-liquid separator, and a third spiral flow guide structure is provided inside the third gas-liquid separator;

[0010] The rotation radius of the first spiral flow guide structure, the rotation radius of the second spiral flow guide structure, and the rotation radius of the third spiral flow guide structure gradually decrease, and / or the flow cross-sectional area of ​​the first spiral flow guide structure, the flow cross-sectional area of ​​the second spiral flow guide structure, and the flow cross-sectional area of ​​the third spiral flow guide structure gradually decrease.

[0011] In addition, the multiphase extraction equipment for treating contaminated soil-groundwater according to the present invention may also have the following additional technical features:

[0012] In some embodiments, the rotation radius of the first spiral guide structure is 0.1m to 0.2m greater than the rotation radius of the second spiral guide structure; the rotation radius of the second spiral guide structure is 0.1m to 0.2m greater than the rotation radius of the third spiral guide structure.

[0013] In some embodiments, the flow cross-sectional area of ​​the first spiral flow guiding structure is greater than the flow cross-sectional area of ​​the second spiral flow guiding structure by 0.01 m 2 ~0.1m 2 The flow cross-sectional area of ​​the second spiral flow guide structure is greater than the flow cross-sectional area of ​​the third spiral flow guide structure by 0.01m 2 ~0.1m 2 .

[0014] In some of the embodiments, a Tesla valve is provided on the pipeline connecting the second gas-liquid separator and the third gas-liquid separator.

[0015] In some of the embodiments, a pipeline structure is provided inside the Tesla valve, and the pipeline structure includes a plurality of pipeline branches alternately arranged and connected, each of the pipeline branches includes a forward straight channel and an arc channel; the inner arc radius of the arc channel is 200mm~300mm, the length of each forward straight channel is 400mm~600mm, and the angle between the forward straight channel and the arc channel at the bifurcation is 10°~45°.

[0016] In some of the embodiments, a liquid ring pump is further provided on the pipeline connecting the second gas-liquid separator and the third gas-liquid separator, and the Tesla valve is provided between the liquid ring pump and the third gas-liquid separator.

[0017] In some embodiments, a liquid ring pump is provided on the pipeline connecting the first gas-liquid separator and the second gas-liquid separator.

[0018] In some embodiments, a Tesla valve is provided on the pipeline connecting the first gas-liquid separator and the second gas-liquid separator.

[0019] In some embodiments, a heat exchange device is provided between the first gas-liquid separator and the second gas-liquid separator, and the mixed phase separated and treated by the first gas-liquid separator is heat exchanged by the heat exchange device before entering the second gas-liquid separator; the refrigerant inlet of the heat exchange device is connected to the circulating water outlet of the circulating water tank, and the refrigerant outlet of the heat exchange device is connected to the inlet of the industrial cooling tower.

[0020] In some of the embodiments, the outlet of the industrial cooling tower is connected to the circulating water tank; the circulating water tank is also connected to the wastewater outlets of the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator.

[0021] In some of the embodiments, the circulating water tank is also connected to a make-up water pipeline.

[0022] In some of the embodiments, the circulating water tank is provided with a liquid level monitoring unit and a temperature monitoring unit.

[0023] In some of the embodiments, a temperature monitoring unit is provided on the first gas-liquid separator.

[0024] In some of the embodiments, a temperature monitoring unit is provided on the second gas-liquid separator.

[0025] In some of the embodiments, a temperature monitoring unit is provided on the third gas-liquid separator.

[0026] In some embodiments, a temperature monitoring unit is provided on the pipeline connecting the first gas-liquid separator and the second gas-liquid separator.

[0027] In some of the embodiments, a temperature monitoring unit is provided on the pipeline connecting the second gas-liquid separator and the third gas-liquid separator.

[0028] In some of the embodiments, a temperature monitoring unit is provided on the outlet connecting pipeline of the third gas-liquid separator.

[0029] In some embodiments, the number of the first gas-liquid separators is two, one of which is a spare gas-liquid separator.

[0030] The present invention also provides a system for treating contaminated soil-groundwater, which includes the aforementioned multiphase extraction equipment for treating contaminated soil-groundwater, an adsorption device and a waste gas treatment device; wherein the outlet of the third gas-liquid separator is connected to the inlet of the adsorption device, and the outlet of the adsorption device is connected to the inlet of the waste gas treatment device.

[0031] Implementing the technical solution of this application has at least the following beneficial effects:

[0032] According to the multiphase extraction equipment for treating contaminated soil-groundwater provided by the present application, it includes a first gas-liquid separator, a second gas-liquid separator and a third gas-liquid separator which are connected in sequence, and a three-stage gas-liquid separation method is adopted, and a spiral flow guide structure is provided inside each gas-liquid separator, that is, a spiral gas-liquid separator is adopted, so that the mixed phase is separated under the premise of large flux flow based on the principle of variable speed centrifugation. In addition, the rotation radius of the spiral flow guide structure in the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator is gradually reduced, and the flow cross-sectional area of ​​the spiral flow guide structure in the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator is gradually reduced, so that the flow velocity of the flow fluid of the spiral flow guide can be gradually increased, thereby increasing the centrifugal force of the separated fluid, and achieving the purpose of gradually increasing the centrifugal separation effect.

[0033] Therefore, the three-stage gas-liquid separation process of the present invention adopts differential centrifugation and gradient centrifugation, which can ensure that the gas-liquid separation efficiency is ≥95% under large-flux extraction, improves the extraction processing flow rate and extraction processing efficiency, and also improves the gas-liquid separation efficiency, which is beneficial to reducing energy consumption.

[0034] Additional aspects and advantages of the present application will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure shows a schematic structural diagram of a multiphase extraction device for treating contaminated soil-groundwater provided by an embodiment of the present invention;

[0036] Figure 2 The figure shows a schematic structural diagram of a first gas-liquid separator (or a second gas-liquid separator, or a third gas-liquid separator) provided in an embodiment of the present invention;

[0037] Figure 3 The figure shows a three-dimensional structural schematic diagram of a multiphase extraction device for treating contaminated soil-groundwater provided by an embodiment of the present invention;

[0038] Figure 4 Shown is a schematic structural diagram of a Tesla valve provided in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 10-first gas-liquid separator; 101-first spiral flow guide structure;

[0041] 20-second gas-liquid separator; 201-second spiral flow guide structure;

[0042] 30-third gas-liquid separator; 301-third spiral flow guide structure;

[0043] 40-Tesla valve; 401-positive straight channel; 402-arc channel;

[0044] 50-Liquid ring pump;

[0045] 60-Pneumatic butterfly valve;

[0046] 70-heat exchange device;

[0047] 80-Industrial cooling tower;

[0048] 90-circulating water tank;

[0049] 100-circulating water pump;

[0050] 110-wastewater treatment system; 111-wastewater delivery pump; 112-filter;

[0051] 120-adsorption device;

[0052] 130-Waste gas treatment equipment. DETAILED DESCRIPTION

[0053] In the description of the present invention, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present invention, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0054] In addition, reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] As analyzed in the background technology, the existing multiphase extraction equipment has the problems of poor gas-liquid separation effect, small extraction process flow rate, and high energy consumption. In addition, the existing multiphase extraction equipment also has the problem of being unable to achieve precise temperature control, which reduces the gas-liquid separation efficiency. In view of this, it is necessary to seek effective technical solutions to alleviate the above problems. Therefore, a multiphase extraction equipment and system for treating contaminated soil-groundwater is used to achieve the purpose of increasing the extraction process volume, treatment efficiency or gas-liquid separation efficiency, saving energy consumption and reducing production costs. The specific technical solution is described below.

[0057] See also Figures 1 to 4 As shown, in some embodiments, a multiphase extraction device for treating contaminated soil-groundwater is provided, comprising a first gas-liquid separator 10, a second gas-liquid separator 20 and a third gas-liquid separator 30 which are connected in sequence; a first spiral guide structure 101 is provided inside the first gas-liquid separator 10, a second spiral guide structure 201 is provided inside the second gas-liquid separator 20, and a third spiral guide structure 301 is provided inside the third gas-liquid separator 30; the rotation radius of the first spiral guide structure 101, the rotation radius of the second spiral guide structure 201, and the rotation radius of the third spiral guide structure 301 gradually decrease, and / or the flow cross-sectional area of ​​the first spiral guide structure 101, the flow cross-sectional area of ​​the second spiral guide structure 201, and the flow cross-sectional area of ​​the third spiral guide structure 301 gradually decrease.

[0058] In the present application, the above-mentioned "contaminated soil-groundwater" refers to contaminated soil and / or groundwater, that is, the provided multiphase extraction equipment can be used to treat contaminated soil, or can be used to treat groundwater, or can be used to treat contaminated soil and groundwater.

[0059] In the present application, contaminated soil and groundwater may be contaminated soil and groundwater containing petroleum hydrocarbon (TPH) contamination, that is, the present invention provides a high-throughput multiphase extraction device that can be used for emergency treatment of TPH contaminated soil and groundwater. For example, the multiphase extraction equipment can be an efficient, high-throughput centrifugal gradient sedimentation multiphase extraction equipment for emergency treatment of sudden TPH leakage, soil and groundwater in a chemical industry park. Of course, in addition to this, the multiphase extraction equipment can also be used in other contaminated soil and groundwater fields, and the embodiments of the present application do not impose specific restrictions on the specific use scenarios and working conditions of the multiphase extraction equipment.

[0060] Optionally, the multiphase extraction equipment in the present application is a skid-mounted multiphase extraction equipment.

[0061] Compared with the problems of poor gas-liquid separation effect, small extraction process flow rate and high energy consumption in traditional skid-mounted multiphase extraction equipment, the skid-mounted multiphase extraction equipment of the present invention can improve the gas-liquid separation effect, increase the extraction process flow rate and reduce energy consumption. This is because, although the traditional gas-liquid separation device will be equipped with a multi-stage (2-3 stages) gas-liquid separation structure, the internal structure of the gas-liquid separation structure is basically similar or even the same, that is, the principle of gas-liquid separation is the same, so the gas-liquid separation effect is average; and based on the premise of skid-mounted equipment design, due to problems such as process, equipment and spatial pipeline layout, the traditional multiphase extraction skid block can generally handle a flow rate of 400m while ensuring logistics transportation (the length, width and height of the skid block will be limited). 3 / h, the extraction flow rate is low. In addition, the reason for the low traditional extraction capacity is that traditional extraction equipment uses the principle of gravity or inertial separation for gas-liquid separation, which has an upper limit on the flow rate. Otherwise, the flow rate of the flow section is too high, and the gas-liquid separation efficiency will drop sharply. Therefore, its processing flow rate can generally only reach 400m 3 / h. However, the present invention adopts the principle of centrifugal separation, which can make the flow rate of the flow section faster and the separation effect better, thus improving the gas-liquid separation effect and increasing the extraction processing capacity, which can be increased from the traditional processing flow rate of 400m 3 / h increased to 660m 3 / h, which effectively improves the extraction process flow rate and helps reduce energy consumption.

[0062] In addition, in some preferred embodiments, compared with the problem of the inability to achieve precise temperature control in traditional skid-mounted multiphase extraction equipment, that is, the traditional multiphase extraction equipment is not equipped with temperature control and only performs rough gas-liquid separation. The equipment of the present application can not only perform single multiphase extraction, but also cooperate with different heating processes to perform in-situ thermal desorption on site. The fluid obtained by its in-situ thermal desorption has a relatively high temperature. In order to avoid subsequent equipment being damaged by high temperature, cooling treatment is required. In addition, another reason why the separation efficiency of traditional multiphase extraction equipment is poor is that the fluid extracted from the ground has a high humidity (close to fog). Therefore, the present application performs cold drying treatment on the fluid by condensation to further improve the gas-liquid separation efficiency.

[0063] Thus, the three-stage gas-liquid separation equipment and process based on differential centrifugation and gradient centrifugation provided in the present application adopts a three-stage gas-liquid separation method through the series arrangement of the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30, and each gas-liquid separator is provided with a spiral guide structure inside, that is, a spiral gas-liquid separator is adopted, so that the mixed phase is separated under the premise of large flux flow based on the principle of variable speed centrifugation. In addition, the rotation radius of the spiral guide structure in the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 is gradually reduced, and the flow cross-sectional area of ​​the spiral guide structure in the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 is gradually reduced. In this way, the flow velocity of the flow fluid of the spiral guide can be gradually increased, thereby increasing the centrifugal force of the separated fluid, and achieving the purpose of gradually increasing the centrifugal separation effect. Therefore, the three-stage gas-liquid separation process of the present invention adopts differential centrifugation and gradient centrifugation, which can ensure that the gas-liquid separation efficiency under large-flux extraction is ≥ 95%, improve the extraction processing flow rate and extraction processing efficiency, and can achieve the processing flow rate increased to 660m 3 / h, and also improves the gas-liquid separation efficiency, which is beneficial to reducing energy consumption.

[0064] In the above multiphase extraction equipment, the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 are connected in sequence, for example, the outlet of the first gas-liquid separator 10 can be connected to the inlet of the second gas-liquid separator 20, and the outlet of the second separator can be connected to the inlet of the third gas-liquid separator 30. In this way, the material to be processed is input into the first gas-liquid separator 10 for primary gas-liquid separation, and the mixed phase obtained by the separation treatment of the first gas-liquid separator 10 enters the second gas-liquid separator 20 for secondary gas-liquid separation; and then the mixed phase obtained by the treatment of the second gas-liquid separator 20 enters the third gas-liquid separator 30 for tertiary gas-liquid separation.

[0065] Optionally, the multiphase extraction equipment may further include a multiphase extraction well vertically disposed downward in the contaminated soil or groundwater of the contaminated site; the outlet of the multiphase extraction well may be connected to the inlet of the first gas-liquid separator 10. It should be noted that the specific structure or connection arrangement of the multiphase extraction well may refer to the relevant prior art, and the present invention is not limited thereto.

[0066] Optionally, the multiphase extraction device may further include a plurality of valves arranged in parallel, and the valve may be a pneumatic butterfly valve 60. The plurality of pneumatic butterfly valves 60 arranged in parallel may be arranged on a pipeline connected to the inlet of the first gas-liquid separator 10, and used to regulate the material entering the first gas-liquid separator 10.

[0067] It should be understood that some conventional device structures in the field, such as multiphase extraction wells and valves, can be set upstream of the inlet of the first gas-liquid separator 10. The present application does not limit the specific structure of these device structures and their connection or setting methods. Conventional settings in the field can be used for selection and setting, and will not be described in detail here.

[0068] In some embodiments, there are two first gas-liquid separators 10, one of which is a spare gas-liquid separator. The two first gas-liquid separators 10 are arranged in parallel, one for use and one for standby, that is, the structures of the two first gas-liquid separators 10 can be the same. By arranging one for use and one for standby, maintenance and repair are convenient, and production efficiency can be improved.

[0069] Optionally, the number of the second gas-liquid separator 20 is one. Optionally, the number of the third gas-liquid separator 30 is one.

[0070] In the present application, the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 are all spiral gas-liquid separators, and a spiral guide structure is provided inside them. The overall structure of the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 can be substantially the same, except that the sizes of the spiral guide structures inside the three are different. As an example, each gas-liquid separator includes a shell and an inner tube arranged in the shell, and the outer diameter of the inner tube is smaller than the inner diameter of the shell to form a guide channel between the inner tube and the shell; each gas-liquid separator also includes a spiral plate (also referred to as a spiral fin), which spirally surrounds the outer wall of the inner tube and is arranged in the guide channel. Of course, each gas-liquid separator can also include conventional structures such as a gas-liquid inlet and a gas-liquid outlet, which are not limited in the present application.

[0071] Therefore, by adopting the spiral gas-liquid separator, not only the gas-liquid separation effect is good, but also the gas-liquid separation efficiency is greatly improved. For example, the design of its spiral flow channel can make the material flow in a spiral airflow, realize the multi-stage separation of the gas-liquid mixture, and then make the separation efficiency of the gas-liquid separator more significant.

[0072] In the present application, a first spiral flow guide structure 101 is provided inside the first gas-liquid separator 10 , and the mixed phase is separated under the premise of high flux flow based on the principle of variable speed centrifugation.

[0073] A second spiral flow guide structure 201 is provided inside the second gas-liquid separator 20 to separate the mixed phase under the premise of high flux flow based on the principle of variable speed centrifugation.

[0074] A third spiral flow guiding structure 301 is provided inside the third gas-liquid separator 30 ; based on the principle of variable speed centrifugation, the mixed phase is separated under the premise of high flux flow.

[0075] The above-mentioned high throughput can be a processing flow of not less than 660m 3 / h, that is, the processing flow rate ≥ 660m 3 / h.

[0076] Furthermore, the three-stage gas-liquid separator takes into account the gas-liquid separation efficiency of a single stage, and gradually increases the flow rate of the fluid flowing through the spiral guide in a proportional gradient, thereby increasing the centrifugal force of the separated fluid. For example, the separation efficiency of the first gas-liquid separator 10 as a first-stage gas-liquid separator is above 80%, and reaches above 90% after passing through a heat exchanger and a second gas-liquid separator 20 as a second-stage gas-liquid separator, and reaches above 95% after passing through a heat exchanger and a third gas-liquid separator 30 as a third-stage gas-liquid separator; or, in general, the three-stage gas-liquid separation process has a gas-liquid separation efficiency of ≥95% while ensuring large-flux extraction.

[0077] In order to achieve the above purpose, that is, to achieve the purpose of gradually increasing the centrifugal separation effect, the present application adopts a method of gradually reducing the rotation radius of the first spiral flow guide structure 101, the rotation radius of the second spiral flow guide structure 201, and the rotation radius of the third spiral flow guide structure 301, and gradually reducing the flow cross-sectional area of ​​the first spiral flow guide structure 101, the flow cross-sectional area of ​​the second spiral flow guide structure 201, and the flow cross-sectional area of ​​the third spiral flow guide structure 301. Specifically:

[0078] According to the formula Q = Au, Q is the total flow rate (flux) of the flow section, A is the flow section area of ​​the spiral guide structure (spiral guide groove), and u is the flow velocity of the flow fluid;

[0079] And, according to the centrifugal force formula Among them, F is the centrifugal force, the unit is N; m is the fluid mass, the unit is kg; u is the rotation linear velocity (flow velocity of the flowing fluid), the unit is m / s; r is the rotation radius, the unit is m.

[0080] It can be seen that if the total cross-sectional flow rate (flux) Q remains unchanged, the cross-sectional area A of the spiral guide structure remains unchanged, that is, the flow velocity u of the flowing fluid remains unchanged, according to the centrifugal force formula for gas-liquid separation, if one wants to increase the centrifugal force, increase the strength of the fluid impacting the inner wall of the gas-liquid separator and the wall of the spiral guide groove as much as possible, and form a liquid film on the inner wall of the gas-liquid separator and the wall of the spiral guide groove to improve the gas-liquid separation efficiency, the cyclone radius r must be reduced. However, reducing the cyclone radius will reduce the residence path and time of the mixed phase in the gas-liquid separator. If one wants to maintain the processing time of the mixed phase, the height of the gas-liquid separator must be increased, and the number of turns of the spiral guide groove must be increased, which will exceed the specifications installed in the skid, and a higher tank body will also increase the pressure loss of the system.

[0081] Therefore, in order to facilitate the installation of the gas-liquid separator in the skid and in large flux (≥660m 3 / h) to maintain high separation efficiency, a multi-stage (such as three-stage) gas-liquid separator is connected in series, and the cyclone radius in the gas-liquid separator is gradually reduced step by step, and the flow cross-sectional area of ​​the spiral guide structure (spiral guide groove) is gradually reduced, so that the flow cross-sectional flow velocity is gradually increased, and then the centrifugal force is gradually increased, so as to achieve the purpose of gradually increasing the centrifugal separation effect.

[0082] In an embodiment of the present application, the rotation radius of the first spiral guide structure 101 in the first gas-liquid separator 10 is greater than the rotation radius of the second spiral guide structure 201 in the second gas-liquid separator 20, and the rotation radius of the second spiral guide structure 201 in the second gas-liquid separator 20 is greater than the rotation radius of the third spiral guide structure 301 in the third gas-liquid separator 30.

[0083] Optionally, the rotation radius of the first spiral guide structure 101 is 0.1m to 0.2m greater than the rotation radius of the second spiral guide structure 201, such as 0.1m, 0.12m, 0.15m, 0.18m, 0.2m, etc. greater than the rotation radius of the second spiral guide structure 201. The rotation radius of the second spiral guide structure 201 is 0.1m to 0.2m greater than the rotation radius of the third spiral guide structure 301, such as 0.1m, 0.12m, 0.15m, 0.18m, 0.2m, etc. greater than the rotation radius of the third spiral guide structure 301.

[0084] In an embodiment of the present application, the flow cross-sectional area of ​​the first spiral guide structure 101 in the first gas-liquid separator 10 is greater than the flow cross-sectional area of ​​the second spiral guide structure 201 in the second gas-liquid separator 20, and the flow cross-sectional area of ​​the second spiral guide structure 201 in the second gas-liquid separator 20 is greater than the flow cross-sectional area of ​​the third spiral guide structure 301 in the third gas-liquid separator 30.

[0085] Optionally, the flow cross-sectional area of ​​the first spiral flow guiding structure 101 is greater than the flow cross-sectional area of ​​the second spiral flow guiding structure 201 by 0.01 m 2 ~0.1m 2 For example, the flow cross-sectional area of ​​the first spiral flow guiding structure 101 is 0.01 m larger than the flow cross-sectional area of ​​the second spiral flow guiding structure 201. 2 、0.015m 2 、0.02m 2 、0.025m 2 、0.03m 2 、0.035m 2 、0.04m 2 、0.05m 2 、0.055m 2 、0.06m 2 、0.07m 2 、0.08m 2 、0.09m 2 、0.1m 2 The flow cross-sectional area of ​​the second spiral flow guiding structure 201 is greater than the flow cross-sectional area of ​​the third spiral flow guiding structure 301 by 0.01 m 2 ~0.1m 2 For example, the flow cross-sectional area of ​​the second spiral flow guiding structure 201 is 0.01m larger than the flow cross-sectional area of ​​the third spiral flow guiding structure 301. 2 、0.015m 2 、0.02m 2 、0.025m 2 、0.03m 2 、0.035m 2 、0.04m 2 、0.05m 2 、0.055m 2 、0.06m 2 、0.07m 2 、0.08m 2 、0.09m 2 、0.1m 2 wait.

[0086] In this way, a three-stage separator is adopted in which the cyclone radius is gradually reduced and the flow cross-sectional area of ​​the spiral guide groove is gradually reduced. This can increase the centrifugal force step by step, thereby achieving the purpose of gradually increasing the centrifugal separation effect, thereby improving the gas-liquid separation efficiency and gas-liquid separation effect, and is conducive to increasing the extraction processing flow rate to meet actual application needs.

[0087] As an example, in a specific embodiment, the rotation radius r of the first spiral guide structure 101 in the first gas-liquid separator 10 is 0.70m, the rotation radius r of the second spiral guide structure 201 in the second gas-liquid separator 20 is 0.55m, and the rotation radius r of the third spiral guide structure 301 in the third gas-liquid separator 30 is 0.40m.

[0088] The flow cross-sectional area A of the first spiral flow guide structure 101 in the first gas-liquid separator 10 is 0.100 m 2 The flow cross-sectional area A of the second spiral flow guide structure 201 in the second gas-liquid separator 20 is 0.035 m 2 The flow cross-sectional area A of the third spiral flow guide structure 301 in the third gas-liquid separator 30 is 0.015m 2 .

[0089] The flow velocity u of the fluid flowing through the first gas-liquid separator 10 is 1.83 m / s, the flow velocity u of the fluid flowing through the second gas-liquid separator 20 is 5.24 m / s, and the flow velocity u of the fluid flowing through the third gas-liquid separator 30 is 12.22 m / s.

[0090] It should be understood that the specific values ​​of r and A in the above-mentioned first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 can be selected and set according to actual conditions. The present application does not limit the specific values ​​as long as they meet the requirements of step-by-step reduction and do not limit the purpose of the present application.

[0091] Further, in some embodiments, a Tesla valve 40 is provided on the pipeline connecting the second gas-liquid separator 20 and the third gas-liquid separator 30. That is, the multiphase extraction device for treating contaminated soil-groundwater further includes a Tesla valve 40, which is provided between the second gas-liquid separator 20 and the third gas-liquid separator 30, such as, the outlet of the second gas-liquid separator 20 is connected to the inlet of the third gas-liquid separator 30 through a pipeline, and the Tesla valve 40 can be provided on the connecting pipeline.

[0092] As mentioned above, increasing the flow rate by reducing the cyclone radius (rotation radius) of the gas-liquid separator and the flow cross-sectional area of ​​the spiral guide groove will eventually affect the residence path and time of the mixed phase in the gas-liquid separator, especially the third gas-liquid separator 30, where the cyclone radius (rotation radius) will be reduced to about 0.4m and the flow cross-sectional area will be reduced to 0.015m 2 It will affect the residence path and time of the mixed phase in the gas-liquid separator. As the last gas-liquid separation measure, it is possible to maintain a relatively long processing time while increasing the centrifugal force as much as possible to improve the final separation efficiency. Therefore, as a further preferred embodiment, the present invention adopts a dual power structure superposition method of a Tesla valve body structure coupled with a liquid ring pump 50 to alleviate the above problems.

[0093] The present invention adopts differential centrifugation and gradient centrifugation through a three-stage gas-liquid separation process, and cooperates with the Tesla valve body to ensure that the gas-liquid separation efficiency is ≥ 95% under large-flux extraction.

[0094] Among them, Tesla valve 40 is a special valve, which has no switch inside and can achieve one-way flow of fluid. Usually, Tesla valve 40 includes a main pipe and multiple branch pipes distributed on both sides of the main pipe. The branch pipe includes a straight part and an arc-shaped part of the branch pipe. When the fluid in the main pipe flows forward (arc-shaped part of the branch pipe -> straight part of the branch pipe), each branch pipe is equivalent to a boost chamber. When the fluid in the branch pipe flows into the main pipe, its flow direction is roughly consistent with the flow direction of the fluid in the main pipe, but it is squeezed with the fluid in the main pipe to increase the speed of the fluid. When the fluid is injected in the reverse direction, when the fluid in the arc-shaped branch pipe flows into the main pipe, its flow direction is roughly opposite to the flow direction of the fluid in the main pipe, the fluid will be subject to spontaneously formed obstacles and cannot pass through Tesla valve 40 normally. Therefore, Tesla valve 40 is a one-way valve.

[0095] In some embodiments, a pipeline structure is provided inside the Tesla valve 40, and the pipeline structure includes a plurality of pipeline branches alternately arranged and connected, each pipeline branch includes a forward straight channel 401 and an arc channel 402; the inner arc radius R of the arc channel 402 is 200mm~300mm, the length L1 of each forward straight channel 401 is 400mm~600mm, and the angle θ at the bifurcation of the forward straight channel 401 and the arc channel 402 is 10°~45°.

[0096] By making the structural dimensions of the Tesla valve 40 within the above range, it is possible to accelerate the fluid separated from the second separator from about 5 m / s to about 12 m / s, and to improve the final separation efficiency of the third gas-liquid separator 30 while increasing the centrifugal force without reducing the processing time.

[0097] As an example, in the Tesla valve 40 used, its internal pipeline structure includes a plurality of pipeline branches connected in an alternating arrangement, each pipeline branch includes a forward straight channel 401 and an arc channel 402, that is, it includes a main pipe and a branch pipe, the forward straight channel 401 belongs to at least part of the main pipe, and the arc channel 402 belongs to part of the branch pipe; the specification of the main pipe can be DN150, and the specification of the branch pipe can be DN50. The angle at the bifurcation of the forward straight channel 401 and the arc channel 402, that is, the separation angle θ, is 10° to 45°, for example, it can be 10°, 15°, 20°, 30°, 35°, 45°, etc. The length L1 of each forward straight channel 401, that is, the length L1 of the branch pipe on the main pipe, is 400mm to 600mm, for example, it can be 400mm, 450mm, 500mm, 550mm, 600mm, etc. The inner arc radius R of the arc channel 402, i.e., the arc portion radius R of the branch pipe, is 200 mm to 300 mm, for example, 200 mm, 250 mm, 300 mm, etc. In addition, the arc channel 402, i.e., the branch pipe, is also provided with a straight portion, and the length L2 of the straight portion of the branch pipe is 200 mm to 350 mm, for example, 200 mm, 300 mm, 350 mm, etc. The number of branch pipes can be set to 4 to 6, and the corresponding length of the main pipe is 1600 mm to 3600 mm.

[0098] Thus, through the design of the above structure and parameters, the flow rate can be accelerated to 10-15 m / s, so that the third gas-liquid separator 30 can improve the final separation efficiency without reducing the processing time while increasing the centrifugal force.

[0099] In some embodiments, a liquid ring pump 50 is further provided on the pipeline connecting the second gas-liquid separator 20 and the third gas-liquid separator 30 , and the Tesla valve 40 is provided between the liquid ring pump 50 and the third gas-liquid separator 30 .

[0100] In the present application, a liquid ring pump 50 and a Tesla valve 40 are provided between the second gas-liquid separator 20 and the third gas-liquid separator 30, and the liquid ring pump 50 can be used to pump the mixed phase separated by the second gas-liquid separator 20 into the third gas-liquid separator 30. The Tesla valve 40 is provided between the liquid ring pump 50 and the third gas-liquid separator 30, that is, the mixed phase separated from the second gas-liquid separator 20 passes through the liquid ring pump 50 and the Tesla valve 40 in sequence and then enters the third gas-liquid separator 30.

[0101] The present invention arranges the Tesla valve 40 between the liquid ring pump 50 and the third gas-liquid separator 30, mainly because the space position of the skid-mounted equipment is very compact, and other positions are difficult to meet the length requirement of the Tesla valve 40; in addition, although the outlet connecting pipeline of the third gas-liquid separator 30, such as the distance between the third gas-liquid separator 30 and the activated carbon adsorption, can meet the length of the Tesla valve 40, the connecting pipeline between the third gas-liquid separator 30 and the activated carbon adsorption has a separate power, such as the activated carbon adsorption and the centrifugal fan, which is the main power of the exhaust gas treatment system. The power source is the centrifugal fan at the rear end. Therefore, if the Tesla valve 40 is set between the third gas-liquid separator 30 and the activated carbon adsorption, the accelerated airflow it provides will be used for the exhaust gas treatment system, but cannot be used for gas-liquid separation. Therefore, the power source formed by the Tesla valve 40 is placed as much as possible in the front gas-liquid separation part, superimposed on the negative pressure power formed by the vacuum pump, so as to ensure that the fluid flow rate entering the third gas-liquid separator 30 reaches a very high speed without reducing the swirl radius of the third gas-liquid separator 30 and the flow cross-sectional area of ​​the spiral guide groove, and finally obtain a flux greater than or equal to 660m 3 / h with a separation efficiency of more than 95%.

[0102] Based on the above, it can be known that the solution of the present invention can accelerate the fluid in the flow section without providing any additional energy consumption, which is beneficial to the three-stage gas-liquid separation and also ensures the power energy of the first and second stages. And through the three-stage gas-liquid separation process, differential centrifugation and gradient centrifugation are used, and the synergistic effect with the Tesla valve body can ensure that the gas-liquid separation efficiency under large-flux extraction is ≥ 95%. Among them, the advantage of using Tesla valve 40 is that, during forward flow, the Tesla valve body has smooth streamlines through confluence, and the local resistance loss is small, which is different from mechanical structures such as reduction in diameter that will produce large local head losses; the Tesla valve body is different from power equipment such as pumps that require greater energy consumption; the Tesla valve body has no moving parts, which reduces the possibility of maintenance and failure, and improves the reliability and service life of the equipment.

[0103] In some embodiments, a liquid ring pump 50 is provided on the pipeline connecting the first gas-liquid separator 10 and the second gas-liquid separator 20 .

[0104] In the present application, a liquid ring pump 50 is arranged between the first gas-liquid separator 10 and the second gas-liquid separator 20. The liquid ring pump 50 can be used to pump the mixed phase separated by the first gas-liquid separator 10 into the second gas-liquid separator 20. That is, the mixed phase separated from the first gas-liquid separator 10 enters the second gas-liquid separator 20 after passing through the liquid ring pump 50.

[0105] Optionally, a Tesla valve 40 is provided on the pipeline connecting the first gas-liquid separator 10 and the second gas-liquid separator 20. The Tesla valve 40 may be provided between the first gas-liquid separator 10 and the second gas-liquid separator 20, or may not be provided.

[0106] In the present application, a liquid ring pump 50 is provided between the first gas-liquid separator 10 and the second gas-liquid separator 20, and between the second gas-liquid separator 20 and the third gas-liquid separator 30. Thus, by using the liquid ring pump 50 as the main power pump body, it is possible to ensure a large-flux extraction flow rate, and because the pump cavity is entirely filled with working circulating liquid, it has isothermal compression and uses water as a sealing liquid, thereby obtaining extremely reliable sealing, avoiding leakage of total petroleum hydrocarbon (TPH) volatiles, and avoiding safety hazards in the use of chemical industrial parks. In addition, the extracted mixed phase can be cooled to avoid subsequent equipment from being damaged by high temperature.

[0107] That is, in view of the background of emergency leakage control in the chemical park, the main power process uses the liquid ring pump 50, which not only provides a large-throughput extraction processing efficiency, but also avoids flammable and explosive hazards.

[0108] The working circulating liquid of the liquid ring pump 50 may come from the liquid separated by the third gas-liquid separator 30 .

[0109] Thus, through the serial superposition of the dual power structure, a higher flow rate is obtained while ensuring the extraction treatment flow rate for emergency treatment, and a very high gas-liquid separation efficiency is obtained under the premise of large flux.

[0110] In some embodiments, a heat exchange device 70 (such as a heat exchanger) is provided between the first gas-liquid separator 10 and the second gas-liquid separator 20. The mixed phase separated and processed by the first gas-liquid separator 10 passes through the heat exchange device 70 for heat exchange and then enters the second gas-liquid separator 20; the refrigerant inlet of the heat exchange device 70 is connected to the circulating water outlet of the circulating water tank 90, and the refrigerant outlet of the heat exchange device 70 is connected to the inlet of the industrial cooling tower 80.

[0111] Therefore, the precise temperature control of the multiphase extraction equipment for treating contaminated soil-groundwater in the present application mainly depends on the heat exchange module. For example, a heat exchanger is arranged between the first gas-liquid separator 10 and the second gas-liquid separator 20, and the mixed phase separated and treated by the first gas-liquid separator 10 enters the heat exchanger. The refrigerant (water) inlet of the heat exchanger is connected to the circulating water outlet of the circulating water tank 90, and the refrigerant outlet of the heat exchanger is connected to the industrial cooling tower 80. The refrigerant (water) is not in direct contact with the mixed phase, and the maximum heat exchange area is guaranteed under large flux, thereby ensuring a higher heat exchange efficiency.

[0112] Optionally, the refrigerant of the heat exchanger is water cooling.

[0113] In some embodiments, the outlet of the industrial cooling tower 80 is connected to a circulating water tank 90; the circulating water tank 90 is also connected to the wastewater outlets of the first gas-liquid separator 10, the second gas-liquid separator 20, and the third gas-liquid separator 30. Optionally, the circulating water tank 90 may also be connected to a circulating water pump 100.

[0114] In some embodiments, the circulating water tank 90 is also connected to a make-up water pipeline.

[0115] In some embodiments, the circulating water tank 90 is provided with a liquid level monitoring unit and a temperature monitoring unit. Optionally, the liquid level monitoring unit and the temperature monitoring unit may include, for example, a liquid level sensor and a temperature sensor. The present application does not limit the specific structure or type of the liquid level monitoring unit and the temperature monitoring unit, and their working principles and types may refer to the prior art.

[0116] In the present application, the refrigerant outlet of the heat exchanger can be connected to the industrial cooling tower 80, and the outlet of the industrial cooling tower 80 can be connected to the circulating water tank 90; in this way, the refrigerant after heat exchange is cooled to the air in the industrial cooling tower 80, and the cooled refrigerant (water) returns to the circulating water tank 90, and because the refrigerant does not directly contact the polluted fluid, no secondary pollution of exhaust gas and greenhouse gas emissions are generated, achieving absolute zero carbon emissions.

[0117] Furthermore, in the present application, a circulating water tank 90 and a circulating water pump 100 are provided, and an online liquid level monitoring unit and an online temperature monitoring unit are provided in the circulating water tank 90 for real-time online monitoring of the working status of the refrigerant; the water in the circulating water tank 90 may come from the waste water separated by each gas-liquid separator and / or the supplied tap water, that is, the waste water separated by the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 may enter the circulating water tank 90, and the supplied tap water may also enter the circulating water tank 90.

[0118] Thus, the mixed phase that has undergone heat exchange in the heat exchanger enters the second gas-liquid separator 20. Since the temperature of the mixed phase is lowered, the mixed phase is further condensed to form droplets in the second gas-liquid separator 20, thereby further improving the gas-liquid separation efficiency.

[0119] Optionally, the multiphase extraction equipment may further include a wastewater treatment system 110, and the wastewater outlets separated by the first gas-liquid separator 10, the second gas-liquid separator 20, and the third gas-liquid separator 30 may also be connected to the wastewater treatment system 110, or the circulating water tank 90 may also be connected to the wastewater treatment system 110. The wastewater treatment system 110 may be a conventional wastewater treatment system, which is not limited in the present invention.

[0120] Optionally, the multiphase extraction equipment may further include a wastewater delivery pump 111 and a filter 112, and the wastewater separated by the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30 passes through the filter 112 and the wastewater delivery pump 111 in sequence and then enters the wastewater treatment system 110, or the wastewater in the circulating water tank 90 passes through the filter 112 and the wastewater delivery pump 111 in sequence and then enters the wastewater treatment system 110.

[0121] In some embodiments, a temperature monitoring unit is provided on the first gas-liquid separator 10 .

[0122] In some embodiments, a temperature monitoring unit is provided on the second gas-liquid separator 20 .

[0123] In some embodiments, a temperature monitoring unit is disposed on the third gas-liquid separator 30 .

[0124] In some embodiments, a temperature monitoring unit is provided on the pipeline connecting the first gas-liquid separator 10 and the second gas-liquid separator 20 .

[0125] In some embodiments, a temperature monitoring unit is provided on the pipeline connecting the second gas-liquid separator 20 and the third gas-liquid separator 30 .

[0126] In some embodiments, a temperature monitoring unit is provided on the outlet connecting pipeline of the third gas-liquid separator 30 .

[0127] The above-mentioned temperature monitoring units may all include a temperature sensor. The present application does not limit the specific model or structure thereof. The specific working principle thereof may also refer to the prior art and will not be elaborated here.

[0128] In the present application, online temperature monitoring instruments can be installed on the main process pipeline of the entire process, the first gas-liquid separator 10, the second gas-liquid separator 20 and the third gas-liquid separator 30. The process parameters can be adjusted intelligently and in real time online through the PLC host computer to ensure intelligent and unmanned control of the equipment.

[0129] In summary, the three-stage gas-liquid separation process of the present invention adopts differential centrifugation and gradient centrifugation, and cooperates with the Tesla valve body to ensure that the gas-liquid separation efficiency is ≥95% under large-flux extraction, and is also beneficial to reduce energy consumption. Moreover, in view of the background of emergency leakage control in chemical parks, the main power process uses a liquid ring pump 50, which not only provides a large-flux extraction processing efficiency, but also avoids flammable and explosive hazards. The overall process of the present invention does not require the use of an external refrigerant, and the wastewater separated from each gas-liquid separation tank is recycled as a refrigerant, and no greenhouse gas emissions are generated. The multiphase extraction equipment of the present invention has an adjustable fluid temperature structure. The self-contained equipment of the present invention can adopt a fully automatic intelligent control system structure to improve production efficiency and automation.

[0130] In addition, the multiphase extraction equipment adopts a skid-mounted miniaturized design as a whole, which can efficiently handle emergency accidents in chemical parks.

[0131] In some embodiments, a system for treating contaminated soil-groundwater is provided, which includes the aforementioned multiphase extraction equipment for treating contaminated soil-groundwater, an adsorption device 120 and a waste gas treatment device 130; wherein, the outlet of the third gas-liquid separator 30 is connected to the inlet of the adsorption device 120, and the outlet of the adsorption device 120 is connected to the inlet of the waste gas treatment device 130.

[0132] Optionally, the adsorption device 120 may include an activated carbon adsorption device.

[0133] The system for treating contaminated soil-groundwater includes the multiphase extraction equipment for treating contaminated soil-groundwater provided in the present application, and thus has at least all the characteristics and advantages of the multiphase extraction equipment for treating contaminated soil-groundwater, which will not be repeated here.

[0134] It should be understood that the above-mentioned system for treating contaminated soil-groundwater may also include conventional equipment in contaminated soil and groundwater treatment systems such as adsorption devices and waste gas treatment equipment. The specific structure, connection and working principle of these conventional equipment can refer to the prior art. This embodiment does not limit this and will not be described in detail here.

[0135] Parts of the present invention that are not described in detail are well known to those skilled in the art.

[0136] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0137] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0138] It should also be noted that in the device, apparatus and method of the present invention, each component or each step can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as an equivalent solution of the present invention.

Claims

1. A multiphase extraction device for treating contaminated soil-groundwater, characterized in that: It includes a first gas-liquid separator, a second gas-liquid separator and a third gas-liquid separator which are connected in sequence; A first spiral flow guide structure is provided inside the first gas-liquid separator, a second spiral flow guide structure is provided inside the second gas-liquid separator, and a third spiral flow guide structure is provided inside the third gas-liquid separator; The rotation radius of the first spiral flow guide structure, the rotation radius of the second spiral flow guide structure, and the rotation radius of the third spiral flow guide structure gradually decrease, and / or the flow cross-sectional area of ​​the first spiral flow guide structure, the flow cross-sectional area of ​​the second spiral flow guide structure, and the flow cross-sectional area of ​​the third spiral flow guide structure gradually decrease.

2. The multiphase extraction equipment for treating contaminated soil-groundwater according to claim 1, characterized in that: The rotation radius of the first spiral guide structure is 0.1m to 0.2m greater than the rotation radius of the second spiral guide structure; The rotation radius of the second spiral guide structure is 0.1 m to 0.2 m greater than the rotation radius of the third spiral guide structure.

3. The multiphase extraction equipment for treating contaminated soil-groundwater according to claim 1, characterized in that: The flow cross-sectional area of ​​the first spiral flow guiding structure is greater than the flow cross-sectional area of ​​the second spiral flow guiding structure by 0.01 m 2 ~0.1m 2 ; The flow cross-sectional area of ​​the second spiral flow guiding structure is greater than the flow cross-sectional area of ​​the third spiral flow guiding structure by 0.01 m 2 ~0.1m 2 .

4. The multiphase extraction equipment for treating contaminated soil-groundwater according to any one of claims 1 to 3, characterized in that: A Tesla valve is provided on the pipeline connecting the second gas-liquid separator and the third gas-liquid separator.

5. The multiphase extraction equipment for treating contaminated soil-groundwater according to claim 4, characterized in that: The Tesla valve is provided with a pipeline structure inside, and the pipeline structure includes a plurality of pipeline branches that are alternately arranged and connected, and each of the pipeline branches includes a forward straight channel and an arc channel; The inner arc radius of the arc channel is 200 mm to 300 mm, the length of each of the forward straight channels is 400 mm to 600 mm, and the angle between the forward straight channel and the arc channel at the bifurcation is 10° to 45°.

6. The multiphase extraction equipment for treating contaminated soil-groundwater according to claim 4, characterized in that: A liquid ring pump is further provided on the pipeline connecting the second gas-liquid separator and the third gas-liquid separator, and the Tesla valve is provided between the liquid ring pump and the third gas-liquid separator; and / or, A liquid ring pump is provided on the pipeline connecting the first gas-liquid separator and the second gas-liquid separator; and / or, A Tesla valve is provided on the pipeline connecting the first gas-liquid separator and the second gas-liquid separator.

7. The multiphase extraction equipment for treating contaminated soil-groundwater according to any one of claims 1 to 3, characterized in that: A heat exchange device is provided between the first gas-liquid separator and the second gas-liquid separator, and the mixed phase separated and processed by the first gas-liquid separator is heat-exchanged by the heat exchange device and then enters the second gas-liquid separator; The refrigerant inlet of the heat exchange device is connected to the circulating water outlet of the circulating water tank, and the refrigerant outlet of the heat exchange device is connected to the inlet of the industrial cooling tower.

8. The multiphase extraction equipment for treating contaminated soil-groundwater according to claim 7, characterized in that: The outlet of the industrial cooling tower is connected to the circulating water tank; The circulating water tank is also connected to the wastewater outlets of the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator; and / or, the circulating water tank is also connected to the make-up water pipeline; and / or, The circulating water tank is provided with a liquid level monitoring unit and a temperature monitoring unit.

9. The multiphase extraction equipment for treating contaminated soil-groundwater according to any one of claims 1 to 3, characterized in that: The first gas-liquid separator is provided with a temperature monitoring unit; and / or, The second gas-liquid separator is provided with a temperature monitoring unit; and / or, The third gas-liquid separator is provided with a temperature monitoring unit; and / or, A temperature monitoring unit is provided on the pipeline connecting the first gas-liquid separator and the second gas-liquid separator; and / or, A temperature monitoring unit is provided on the pipeline connecting the second gas-liquid separator and the third gas-liquid separator; and / or, A temperature monitoring unit is provided on the outlet connecting pipeline of the third gas-liquid separator.

10. A system for treating contaminated soil-groundwater, characterized in that: A multiphase extraction device, an adsorption device and a waste gas treatment device for treating contaminated soil-groundwater according to any one of claims 1 to 9; The outlet of the third gas-liquid separator is connected to the inlet of the adsorption device, and the outlet of the adsorption device is connected to the inlet of the exhaust gas treatment equipment.

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