High-precision non-saturated soil gas-liquid multiphase micro sampling separator

Abstract

A high-precision unsaturated soil gas-liquid multiphase micro sampling separator includes four parts of an external porous cladding, a cylindrical shaft sleeve, a liquid storage chamber and a sealing rubber plug; the cylindrical shaft sleeve is provided with a gas-liquid separation rotor, a micro bearing, a sealing rubber ring, a microporous ceramic plate and a gas guide pipe; the liquid storage chamber is provided with a micro electric motor, a liquid guide pipe and a wire; the gas-liquid separation rotor is connected with the micro bearing and connected with the micro electric motor through the sealing rubber ring, the micro electric motor is located in the liquid storage chamber and is isolated and sealed, and the microporous ceramic plate is located below the liquid storage chamber; the gas guide pipe is located on the upper part of the cylindrical shaft sleeve, the liquid guide pipe is located on the lower part of the liquid storage chamber, and a switch valve is arranged at the outlet of each. The present application has the advantages of exquisite structure, small size, indoor model test function demand, convenient use, continuous sampling and efficient separation of gas-liquid in unsaturated soil, and great significance for monitoring and repairing of contaminated soil and groundwater.

Description

Technical Field

[0001] The present invention relates to the field of contaminated soil and groundwater monitoring and remediation, and in particular to a high-precision unsaturated soil gas-liquid multiphase micro sampling separator, which is a laboratory device. Background Art

[0002] At present, the form of soil pollution in my country is severe (wide range, complex types of pollutants). In order to meet the needs of economic and green ecological development, a variety of remediation technologies have been introduced one after another, mainly including in situ remediation and ex situ remediation. With the development of domestic soil remediation technology, the use of economical, environmentally friendly, and deep-level soil remediation in situ remediation technology has gradually become the mainstream technology. In the in situ remediation of contaminated soil, the migration and transformation process of pollutants reflects the effectiveness of the remediation means, and fixed-point sampling is usually used for monitoring. For volatile organic compounds (such as trichloroethylene and polychlorinated biphenyls), they not only flow in the form of liquid in unsaturated soil, but also have strong volatility. Therefore, it is necessary to sample and efficiently separate the gas and liquid simultaneously in order to carry out comprehensive monitoring of gas-liquid pollutants. However, the current sampler can only perform single-phase sampling of gas or liquid (for example, a soil solution continuous collection device disclosed in the patent document with application publication number CN207036499U), which cannot meet the needs of continuous sampling and efficient separation monitoring of gas-liquid two-phase in unsaturated soil. On the other hand, the existing samplers are large in size, and their burial and use cause great disturbance to the soil and surrounding hydraulic environment, significantly changing the original properties of the soil around the samplers and resulting in large monitoring errors. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a high-precision unsaturated soil gas-liquid multiphase micro sampling and separator, which has small environmental disturbance, high-precision gas-liquid two-phase continuous sampling and efficient separation, and plays a decisive role in monitoring the migration and transformation process of pollutants in unsaturated soil.

[0004] To achieve the above object, the solution of the present invention is:

[0005] A high-precision non-saturated soil gas-liquid multiphase micro-sampling separator comprises four parts: an external porous cladding (1), a cylindrical shaft sleeve (2), a liquid storage chamber (3) and a sealing rubber plug (4), wherein:

[0006] The outer porous cladding (1) is used to isolate external soil solid particles to achieve the purpose of filtration and ensure that the sampled gas and liquid samples are free of soil particle impurities;

[0007] The cylindrical shaft sleeve (2) is used to receive a gas-liquid mixed sample and realize gas-liquid separation in the cylindrical shaft sleeve (2);

[0008] The liquid storage chamber (3) is used to store the liquid component after gas-liquid separation;

[0009] The external porous cladding (1) is tightly connected to the cylindrical shaft sleeve (2), and gas and liquid only enter the cylindrical shaft sleeve (2) from the outside of the porous cladding (1); the height of the external porous cladding (1) is consistent with that of the cylindrical shaft sleeve (2); the liquid storage chamber (3) is located in the middle of the cylindrical shaft sleeve (2); and the sealing rubber plug (4) is used to seal the cylindrical shaft sleeve (2).

[0010] Furthermore, the cylindrical shaft sleeve (2) is provided with a gas-liquid separation rotor (5), a micro bearing (6), a sealing rubber ring (7), a microporous ceramic plate (9), and a gas conduit (8); and

[0011] The liquid storage chamber (3) is provided with a micro electric motor (10), a liquid conduit (11) and a wire (12);

[0012] in:

[0013] The gas-liquid separation rotor (5) is connected to the micro bearing (6) and is connected to the micro electric motor (10) via a sealing rubber ring (7); the micro electric motor (10) is located inside the liquid storage chamber (3) for isolation and sealing; the microporous ceramic plate (9) is located below the liquid storage chamber (3); the gas conduit (8) is located at the upper part of the cylindrical shaft sleeve (2); the liquid conduit (11) is located at the lower part of the liquid storage chamber (3); the sealing rubber plug (4) is located at the rightmost side of the device and wraps the gas conduit (8) and the liquid conduit (11).

[0014] Furthermore, the outlets of the gas conduit (8) and the liquid conduit (11) are both provided with switch valves (13).

[0015] Furthermore, the axis center position of the electric motor (10) is consistent with the axis center position of the liquid storage chamber (3).

[0016] Furthermore, the liquid storage chamber (3) is cylindrical in shape.

[0017] Furthermore, the microporous ceramic plate (9) is tightly attached to the bottom of the liquid storage chamber (3), and the corresponding position of the liquid storage chamber is hollowed out; the micro electric motor (10) and the wire (12) are located in the liquid storage chamber (3) in a sealed state, and the wire (12) is connected to the external power supply (15) through the rubber plug (4).

[0018] Furthermore, the gas conduit (8) and the liquid conduit (11) are both provided with matching connecting hoses on the outside, and the hoses are used to connect the matching gas sample chamber (16), the liquid sample chamber (17) and the external negative pressure machine (15).

[0019] By adopting the above scheme, the beneficial effects of the present invention are:

[0020] The high-precision, unsaturated soil gas-liquid multiphase micro-sampler and separator of this invention is compact and meets laboratory size requirements (3-6 cm). It utilizes an external porous cladding to effectively isolate soil solid particles. Its gas-liquid separation rotor and microporous ceramic plates enable continuous gas-liquid sampling and efficient separation. Closing the valve on the gas conduit allows for water quality sampling in saturated aquifers, while closing the valve on the liquid conduit allows for pure gas sampling.

[0021] The present invention has multiple applicable scenarios, a wide range of adaptability, a compact size, little disturbance to the soil environment, and high precision, and can effectively promote research and development in the field of contaminated soil-groundwater monitoring and remediation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the working environment and external supporting devices of the high-precision multiphase micro sampler device in this embodiment.

[0023] Figure 2 for Figure 1 Schematic diagram of the two-dimensional structure of the medium- and high-precision multiphase microsampler device.

[0024] Figure 3 for Figure 2 Schematic diagram of the three-dimensional power structure of the mid-bubble separation rotor.

[0025] Figure 4 for Figure 2 Schematic diagram of the three-dimensional structure of mesoporous ceramic plate.

[0026] Reference numerals:

[0027] 1- External porous cladding,

[0028] 2- cylindrical shaft sleeve, 3- liquid storage chamber,

[0029] 4-sealing rubber plug, 5-bubble separation rotor, 6-miniature bearing, 7-sealing rubber ring,

[0030] 8-gas conduit, 11-liquid conduit,

[0031] 9-microporous ceramic plate, 10-micro electric motor, 12-wire, 1301-gas conduit valve, 1302-liquid conduit valve, 14-sampler, 15-negative pressure machine,

[0032] 16-gas sample chamber, 17-liquid sample chamber, 18-experimental soil sample. DETAILED DESCRIPTION

[0033] The present invention provides a device capable of realizing continuous gas-liquid sampling and efficient separation in unsaturated soil.

[0034] The present invention will be further described below with reference to the examples.

[0035] Example:

[0036] A high-precision multiphase micro sampler device of this embodiment includes the following structural components: an external porous cladding 1, a cylindrical shaft sleeve 2, a gas-liquid separation rotor 5, a micro bearing 6, a sealing rubber ring 7, a micro electric motor 10, a microporous ceramic plate 9, a liquid conduit 11, a gas conduit 8, a liquid storage chamber 3, a sealing rubber stopper 4, a wire 12 and a switch valve 13.

[0037] like Figure 2 As shown, a high-precision multiphase micro sampler device includes a micro sampler 14; the micro sampler 14 mainly includes an outer porous thin layer 1, a cylindrical shaft sleeve 2, a liquid storage chamber 3 and a sealing rubber plug 4.

[0038] The outer porous thin layer 1 can be used to isolate soil solid particles and prevent them from entering the cylindrical shaft sleeve 2, thereby purifying the sample. The cylindrical shaft sleeve 2 includes a gas-liquid separation rotor 5, a micro-bearing 6, a sealing rubber ring 7, a micro-electric motor 10, a microporous ceramic plate 9, a liquid conduit 11, a gas conduit 8, a liquid storage chamber 3, and a wire 12. The cylindrical shaft sleeve 2 is hollow, and the interior contains gas-liquid fluid. When the gas-liquid mixed fluid enters the cylindrical shaft sleeve 2, the gas floats upward and the liquid flows downward under the action of gravity, achieving the purpose of primary gas-liquid separation. The gas-liquid separation rotor 5 is used to perform secondary gas-liquid separation on larger bubbles in the liquid. The microporous ceramic plate 9, due to its high air intake value, serves to block gas and liquid, and can perform tertiary gas-liquid separation on the microbubbles remaining in the liquid, thereby achieving continuous gas-liquid sampling and efficient separation.

[0039] like Figure 3 As shown, the gas-liquid separation rotor 5 is connected to the micro electric motor 7 through a micro bearing 6, and is connected to an external supporting power supply 15 based on a wire 12. The micro electric motor 10 and the wire 12 are located inside the liquid storage chamber 3 and are sealed to be isolated from the liquid.

[0040] like Figure 4 As shown, the microporous ceramic plate 9 is located at the lower part of the liquid storage chamber 3, close to the outer wall of the liquid storage chamber 3, and the corresponding position of the liquid storage chamber 3 is hollowed out to facilitate the liquid to enter the liquid storage chamber 3 from the microporous ceramic plate 9. The gas conduit 8 and the liquid conduit 11 are respectively located in the cylindrical shaft sleeve 2 and the liquid storage chamber 3, and are only in contact with air and liquid respectively. The outlet valves 13 of the gas conduit 8 and the liquid conduit 11 are used to control the outflow of gas and liquid samples and the switching of the sampler function.

[0041] Reference Figure 1 The working principle of a high-precision multiphase micro sampler device of this embodiment is as follows:

[0042] Step 1: Insert the microsampler 14 into the appropriate position of the indoor test soil sample 18, maintaining good hydraulic contact between the sampler 14 and the test soil sample 18. Turn on the external vacuum pump 15 and connect the sampler 14 to a power source. Open the valves (1301, 1302) on the gas conduit 8 and the liquid conduit 11, and connect the vacuum pump 15, the gas sample chamber 16, and the liquid sample chamber 17.

[0043] Step 2: After the gas-liquid flow field in the soil stabilizes, turn on the external negative pressure machine 15 to create negative pressure around the sampler 14, so that the gas-liquid fluid around the sampler 14 enters the cylindrical shaft sleeve 2 through the external porous cladding 1; the experimenter checks whether the working state of the negative pressure machine 15 is smooth. For example, if the pressure increases suddenly, the external porous cladding 1 may be blocked and should be cleaned in time.

[0044] Step 3: The soil solid particles are isolated by the external porous cladding 1. After the gas-liquid fluid enters the cylindrical shaft sleeve 2 under the action of negative pressure, the gas floats up and the liquid flows downward under the action of gravity. At this time, the gas-liquid two-phase flow undergoes a primary separation;

[0045] Step 4: The bubble separation rotor 5 inside the sampler 14 starts to work under the action of the external power supply 15 and the micro electric motor 10. The bubbles in the liquid are separated by the rotation of the rotor 5 structure. At this time, the gas-liquid two-phase fluid undergoes secondary separation.

[0046] Step 5: Under the action of negative pressure, the upper air is extracted through the gas conduit 8 and enters the external supporting gas sample chamber 16 for standby use;

[0047] Step 6: When the liquid enters the liquid storage chamber 3, the micro-bubbles remaining in the liquid are isolated on the outside of the ceramic plate through the high air-intake value microporous ceramic plate 9 that blocks air and liquid. Only the liquid passes through the ceramic plate, realizing three-level gas-liquid separation, thereby achieving the purpose of high-precision gas-liquid separation.

[0048] Step 7: The liquid in the liquid storage chamber is extracted through the liquid conduit 11 and enters the external supporting liquid sample chamber 17 for standby use.

[0049] Step 8: Close the gas conduit valve 1301. Using similar steps as above, the sampler can be used for continuous sampling of liquid in saturated soil. Close the liquid conduit valve 1302. The sampler can be used for continuous sampling of gas in completely dry soil.

[0050] The description of the above embodiments is intended to facilitate understanding and mastering of the technical principles and operating procedures of the present invention by those skilled in the art. It will be apparent that those skilled in the art can easily make various adjustments and modifications to these embodiments and apply the general principles described herein to other embodiments without resorting to creative effort. Therefore, the present invention is not limited to the above embodiments. Any improvements and modifications made by those skilled in the art based on the principles of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A high-precision unsaturated soil gas-liquid multiphase micro sampling separator, characterized in that: It includes a micro sampler (14), a negative pressure machine (15), a gas sample chamber (16), and a liquid sample chamber (17); The micro sampler (14) comprises an external porous cladding (1), a cylindrical shaft sleeve (2), a liquid storage chamber (3) and a sealing rubber plug (4), wherein: the external porous cladding (1) is used to isolate external soil solid particles to achieve the purpose of filtering and ensure that the sampled gas and liquid sample does not contain soil particle impurities; the cylindrical shaft sleeve (2) is used to receive a gas-liquid mixed sample and realize gas-liquid separation in the cylindrical shaft sleeve (2); the liquid storage chamber (3) is used to store liquid components after gas-liquid separation; the external porous cladding (1) is tightly connected to the cylindrical shaft sleeve (2), and gas and liquid only enter the cylindrical shaft sleeve (2) from the outside of the external porous cladding (1); the height of the external porous cladding (1) is consistent with that of the cylindrical shaft sleeve (2); the liquid storage chamber (3) is located in the middle of the cylindrical shaft sleeve (2); and the sealing rubber plug (4) is used to seal the cylindrical shaft sleeve (2); The cylindrical shaft sleeve (2) is provided with a gas-liquid separation rotor (5), a micro bearing (6), a sealing rubber ring (7), a micro electric motor (10), a microporous ceramic plate (9), a liquid conduit (11), a gas conduit (8), a liquid storage chamber (3) and a wire (12); the cylindrical shaft sleeve (2) is a cavity, and the interior is a gas-liquid fluid; the gas-liquid mixed fluid enters the cylindrical shaft sleeve (2), and under the action of gravity, the gas floats up and the liquid flows down to achieve the purpose of primary gas-liquid separation, the gas-liquid separation rotor (5) is used to perform secondary gas-liquid separation on larger bubbles in the liquid, and the microporous ceramic plate (9) has a high air intake value to block gas and liquid, and can perform tertiary gas-liquid separation on the microbubbles remaining in the liquid, thereby achieving continuous gas-liquid sampling and efficient separation; The gas-liquid separation rotor (5) is connected to the micro electric motor (10) via a micro bearing (6) and is connected to an external power supply via a wire (12); the micro electric motor (10) and the wire (12) are located inside the liquid storage chamber (3), and the gas-liquid separation rotor (5) is located outside the liquid storage chamber (3); The microporous ceramic plate (9) is located at the lower part of the liquid storage chamber (3), close to the outer wall of the liquid storage chamber (3), and the corresponding position of the liquid storage chamber (3) is hollowed out to facilitate liquid to enter the liquid storage chamber (3) from the microporous ceramic plate (9); The gas conduit (8) and the liquid conduit (11) are respectively located in the cylindrical shaft sleeve (2) and the liquid storage chamber (3), and are in contact only with air and liquid respectively; The gas conduit (8) is located in the upper inner portion of the cylindrical shaft sleeve (2), and the liquid conduit (11) is located in the lower inner portion of the liquid storage chamber (3); The gas conduit (8) and the liquid conduit (11) are both provided with matching connecting hoses on the outside, and the hoses are used to connect the matching gas sample chamber (16), the liquid sample chamber (17) and the external negative pressure machine (15); The gas conduit is provided with a gas conduit valve, and the liquid conduit is provided with a liquid conduit valve.

2. The high-precision unsaturated soil gas-liquid multiphase micro sampling separator according to claim 1, characterized in that: The axis center position of the micro electric motor (10) is consistent with the axis center position of the liquid storage chamber (3).

3. The high-precision unsaturated soil gas-liquid multiphase micro sampling separator according to claim 1, characterized in that: The liquid storage chamber (3) is cylindrical in shape.

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