Device and method for sampling and draining high-pressure liquid

Abstract

The invention discloses a high-pressure liquid sampling and emptying device and method. The device comprises a high-pressure liquid storage tank, a sampler, a gas velocity detector and a gas collector which are connected in sequence, in the sampling process, the change of the gas velocity during sampling can be monitored through the gas velocity detector, and corresponding signals are fed back to an operator to replace direct visual observation of the flowing state of a sample, so that the problem that observation depends on a window in the high-pressure or even high-temperature and high-pressure sampling process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure liquid sampling, and in particular to a device and method suitable for high-pressure liquid sampling and cleaning. Background Art

[0002] In various types of chemical plants, there are many situations involving the coexistence of gas and liquid, and high-pressure liquid storage tanks are widely used. In the actual operation process, in order to analyze the operating status of the device or maintain the system balance to ensure continuous operation, it is usually necessary to regularly remove the liquid from the liquid storage tank and drain it. Especially for small devices, the liquid storage tank is generally small and requires frequent sampling operations. When sampling, the operator wears appropriate protective equipment, opens the sampling valve of the liquid storage tank, and controls the outflow rate of the liquid sample by adjusting the valve opening. When the operator observes with his eyes that the liquid is no longer flowing out, it means that the liquid is drained and the sampling valve is closed. The gas that suddenly spurts out when the liquid is drained can easily cause the liquid to splash and cause harm to the operator. When toxic and harmful media are involved, closed sampling is required, usually in a sealed box, and an observation window needs to be set on the box so that the operator can observe the outflow status of the liquid at any time. When the liquid is at a high temperature, the liquid sample vapor is easy to adhere to the observation window, blocking the operator's line of sight and bringing difficulties to the sampling process.

[0003] CN96230476.X discloses a closed sampler for collecting samples on site in chemical industry, which is composed of a liquid inlet pipe, a liquid return pipe, a liquid discharge pipe, a valve, a gas distribution board, etc. connected to the box body and the on-site sampling medium, and uses a hydraulic mechanism and a compression spring to achieve the connection and disconnection of the liquid filling line and the liquid return line, so as to avoid direct contact between the operator and the sample. The sampling device has a complex process, and the sample flow condition needs to be observed visually in real time during the sampling operation.

[0004] CN201910392195.1 discloses an environmentally friendly high-temperature asphalt online automatic sampling device, which belongs to the field of coal tar processing and production equipment, including an online sampling mechanism and an automatic control system. The online sampling mechanism includes a base, a sampling table, a residual liquid box, a sampling rod, a sampling cup, a dust cover, a heat tracing pipe, an insulation layer, and an explosion-proof tube lamp: the automatic control system includes a PLC cabinet, a cylinder, a three-position four-way electromagnetic reversing valve, a pneumatic sampling valve, and a pneumatic flue gas valve; the PLC cabinet is connected to the three-position four-way electromagnetic reversing valve, the pneumatic sampling valve, and the pneumatic flue gas valve through a control circuit; the cylinder is installed on the sampling rod. It adopts a method of sequentially controlling the three-position four-way electromagnetic valve, the pneumatic sampling valve, and the pneumatic flue gas valve by PLC to achieve the purpose of automatic sampling and effectively prevent the generation of a large amount of asphalt smoke during the high-temperature asphalt sampling process. Pollution to the environment. In order to facilitate the observation of the flow state of the sample, tempered glass observation windows are installed on the sampling door and the sampling table.

[0005] CN202110113601.3 discloses a device for closed sampling of toxic liquids, including a protective box, a distillation kettle is provided on one side of the protective box, an infusion tube and a reflux tube are connected to the upper end of the distillation kettle, a liquid outlet valve is installed on the infusion tube, one end of the infusion tube is connected to a sample washing tank, and the sample washing tank is installed at the upper end of the protective box, and the lower end of the sample washing tank is connected to a connecting tube; the sampling method disclosed in it includes the steps of preparation, connection, replacement, sampling, etc. The device can effectively replace the sampling system, the sampling is real and reliable, and the vacuum and gravity self-flow method is used to avoid the system from operating under pressure. The sampling port adopts a double needle setting, one long and one short, the long needle is used for liquid outflow, and the short needle is used for the gas overflow in the sample during the sampling process to enter the adsorption tank for absorption, effectively avoiding the positive pressure of the sampling bottle; however, the sampling system is complex, and visual observation of sample flow is still required during the sampling process.

[0006] CN202221889700.7 provides a closed sampling device for a pressurized liquid pipeline, including a reactor, a first filter, a second filter, a quantitative intermediate tube and a finished product storage tank, wherein the quantitative intermediate tube is provided with a scale and is made of a transparent material to facilitate observation of the liquid in the quantitative intermediate tube, and a second window is also provided on the sampling pipeline to visually observe the liquid entering the sampling pipeline in real time.

[0007] In summary, existing sampling devices and methods are based on visual observation to judge the flow state of the sample. When the liquid is drained and gas suddenly spurts out, it is easy to cause liquid splashing, causing harm to the operator. If the sample contains toxic and harmful components, closed sampling is generally adopted. Due to the reliance on visual observation, an observation window must be reserved. Therefore, the sampling system is generally more complicated. At the same time, since the observation window is generally made of transparent glass or clinker, the system has low pressure resistance and poor sealing, which may cause toxic components in the sample to leak, causing personal injury or environmental pollution. When it comes to high-temperature samples, there may be fog that blurs the window and affects the normal sampling operation. Summary of the invention

[0008] The object of the present invention is to provide a device and method for high-pressure liquid sampling and draining, so as to solve the problem of relying on window observation during high-pressure or even high-temperature and high-pressure sampling.

[0009] To achieve one aspect of the above-mentioned invention object, the present invention adopts the following technical solution:

[0010] A device for sampling and draining high-pressure liquid, comprising a high-pressure liquid storage tank, a sampler, a gas velocity detector and a gas collector connected in sequence;

[0011] The sampler comprises a tank body for storing liquid, a liquid inlet and a gas outlet are arranged on the top of the tank body of the sampler, the liquid inlet is connected to a high-pressure liquid storage tank to receive all liquid samples from the high-pressure liquid storage tank, the gas outlet is connected to an inlet of a gas velocity detector to deliver the gas in the tank body of the sampler to the gas velocity detector; the outlet of the gas velocity detector is connected to an inlet of a gas collector, wherein the gas velocity detector is used to give a signal indication when the velocity of the gas flow passing through it increases sharply or exceeds a certain value;

[0012] Wherein, a regulating valve is provided on the connecting pipeline between the sampler inlet and the high-pressure liquid storage tank.

[0013] In the present invention, it is understood in the art that "sharp increase in gas velocity" can be understood as a sudden sharp increase in gas velocity in a short period of time, such as an increase of at least 1 times in a period of time not exceeding one second; for "gas velocity exceeds a certain value", its specific value should be determined according to actual conditions, for example, it can be at least twice the gas velocity during normal liquid sampling, such as two, three or four times.

[0014] In some embodiments, a first ball valve, the regulating valve, and a second ball valve are sequentially provided on a connecting pipeline between the sampler inlet and the high-pressure liquid storage tank along a logistics direction.

[0015] In some embodiments, a third ball valve is provided on the connecting pipeline between the sampler gas outlet and the gas velocity detector, and a fourth ball valve is provided on the connecting pipeline between the gas velocity detector and the gas collector.

[0016] In some embodiments, the gas velocity detector is a vortex flowmeter with a display, preferably a digital vortex flowmeter.

[0017] In some embodiments, the gas velocity detector is a gas sounder with a tubular whistle structure, which is used to emit a warning whistle sound when the gas velocity increases sharply or exceeds a certain value.

[0018] In some embodiments, no observation window is provided in the device. Preferably, the gas collector is an air bag or a sampling bladder.

[0019] In some embodiments, the regulating valve is an automatically controlled regulating valve, such as a pneumatic regulating valve controlled by a PLC, so as to close when receiving an air flow signal from the air velocity detector indicating that the air velocity increases sharply or exceeds a certain value.

[0020] In order to achieve another aspect of the above-mentioned invention object, the present invention also provides a method for high-pressure liquid sampling and cleaning using the above-mentioned device:

[0021] Open each valve in the device to allow the liquid in the high-pressure liquid storage tank to flow into the sampler, and the gas in the sampler to flow into the gas collector after passing through the gas velocity detector; when the gas velocity detector gives a signal indicating that the gas velocity passing through it increases sharply or exceeds a certain value, close the regulating valve on the connecting pipeline between the sampler inlet and the high-pressure liquid storage tank to prevent the gas in the high-pressure liquid storage tank from continuing to enter the sampler.

[0022] In some embodiments, the pressure of the material in the high-pressure liquid storage tank is above 0.1 MPaG (the pressures involved in the present invention are all gauge pressures), such as 0.5 MPaG, 2 MPaG or 3 MPaG.

[0023] In some embodiments, the material in the high-pressure liquid storage tank is a high-temperature and high-pressure material, with a pressure above 0.1 MPaG, such as 1 MPaG or 3 MPaG, and a temperature above 60°C, such as 100°C, 150°C, or 300°C.

[0024] In some embodiments, the regulating valve is an automatically controlled regulating valve, so as to close when receiving a gas flow signal from the gas velocity detector indicating that the gas velocity increases sharply or exceeds a certain value;

[0025] When sampling, first open the second ball valve, the third ball valve and the fourth ball valve, then open the first ball valve, and then open the regulating valve to allow the liquid sample to gradually flow into the sampler and the gas collector to be gradually inflated; when the gas velocity detector gives a signal indicating that the gas velocity passing through it increases sharply or exceeds a certain value, the regulating valve is automatically closed;

[0026] Then close the first shut-off valve, and then close the second valve, the third valve and the fourth valve; finally disconnect the sampler from the high-pressure liquid storage tank between the regulating valve and the second valve for subsequent sample transfer and analysis.

[0027] In some embodiments, the gas velocity detector is a gas sounder;

[0028] When sampling, first open the second valve, the third valve and the fourth valve, then open the first shut-off valve, and then open the regulating valve to allow the liquid sample to gradually flow into the sampler and the gas collector to be gradually inflated; when the gas sounder emits a warning whistle due to a sharp increase in gas velocity or exceeding a certain value, close the regulating valve;

[0029] Then close the first shut-off valve, and then close the second valve, the third valve and the fourth valve; finally disconnect the sampler from the high-pressure liquid storage tank between the regulating valve and the second valve for subsequent sample transfer and analysis.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] During the sampling process, the present invention can monitor the change of gas velocity during sampling through a gas velocity detector, and feed back the corresponding signal to the operator, instead of directly visually observing the flow state of the sample, thereby solving the problem of relying on window observation during high-pressure or even high-temperature and high-pressure sampling, and avoiding the safety hazards caused by relying on window observation.

[0032] The flow state of the liquid sample can be determined based on the gas flow rate change signal. When the gas velocity suddenly increases, it means that the liquid is completely discharged, and the sampling valve should be closed quickly.

[0033] The present invention innovatively proposes to determine the flow state of the sample by means of a gas velocity detector, replacing the existing method of directly visually observing the sample. This can simplify the device, avoid harm to operators caused by liquid splashing, truly achieve closed sampling, and reduce waste gas emissions and environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of an embodiment of the device for high-pressure liquid sampling and purification provided by the present invention.

[0035] The reference numerals in the figures are described as follows:

[0036] High-pressure liquid storage tank 10; sampler 20; gas velocity detector 30; gas collector 40;

[0037] The first ball valve V-1; the regulating valve V-2; the second ball valve V-3; the third ball valve V-4; the fourth ball valve V-5. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof 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 necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Figure 1 The device for sampling and draining high-pressure liquid provided by the present invention is shown, and the device comprises a high-pressure liquid storage tank 10, a sampler 20, a gas velocity detector 30 and a gas collector 40 which are connected in sequence.

[0041] In which, the sampler 20 includes a tank body for storing liquid, and a liquid inlet and a gas outlet are provided on the top of the tank body of the sampler. The liquid inlet is connected to the high-pressure liquid storage tank 10 to receive all liquid samples from the high-pressure liquid storage tank 10, wherein a regulating valve V-2 is provided on the connecting pipeline between the sampler inlet and the high-pressure liquid storage tank 10 so as to gradually open the sampling and reduce the risk of high-pressure shock; in one embodiment, a first ball valve V-1, the regulating valve V-2 and the second ball valve V-3 are sequentially provided on the connecting pipeline between the sampler inlet and the high-pressure liquid storage tank 10 along the logistics direction.

[0042] The gas outlet is connected to the inlet of the gas velocity detector 30, and is used to deliver the gas in the sampler tank to the gas velocity detector 30. In one embodiment, a third ball valve V-4 is provided on the connecting pipeline between the sampler gas outlet and the gas velocity detector to cut off the logistics when necessary.

[0043] In some embodiments, the second ball valve V-3 and the third ball valve V-4 are respectively arranged on the liquid inlet and the gas outlet of the sampler, so that when the sampler 20 is removed after closing the second ball valve V-3 and the third ball valve V-4, the material in the sampler 10 will not leak.

[0044] The gas velocity detector outlet is connected to the gas collector 40 inlet, wherein the gas velocity detector 20 is used to give a signal indication when the gas velocity passing through it increases sharply or exceeds a certain value. In one embodiment, a fourth ball valve V-5 is provided on the connecting pipeline between the gas velocity detector 30 and the gas collector 40 to cut off the logistics when necessary.

[0045] In the present invention, due to the high pressure (such as above 0.1MPaG), when the liquid in the high-pressure liquid phase storage tank is sampled and discharged, the high-pressure gas in the high-pressure liquid phase storage tank will immediately enter the sampler, pass through the upper space of the sampler, and directly enter the subsequent gas velocity detector through the gas outlet of the sampler. Due to the high pressure of the gas, it will not maintain the same gentle gas velocity as that flowing through the gas velocity detector during normal liquid sampling, but will cause the gas velocity to increase rapidly. The present invention utilizes this point and sets the gas velocity detector to give a signal indication when the gas velocity passing through it increases sharply or exceeds a certain value, so that the operator can grasp the situation that the liquid in the high-pressure liquid phase storage tank has been sampled and discharged in time. Among them, it is understood in the art that "sudden increase in gas velocity" can be understood as a sudden increase in gas velocity in a short period of time, such as an increase of at least 1 times in a time not exceeding one second; for "gas velocity exceeds a certain value", its specific value should be determined according to the actual situation, such as it can be at least twice the gas velocity during normal liquid sampling, such as two times, three times or four times.

[0046] In the present invention, the signal indication given by the gas velocity detector may be an acoustic, optical and / or electrical signal indication. For example, the gas velocity detector is a vortex flowmeter with a display, preferably a digital vortex flowmeter, which can display the gas velocity in real time, so that the operator can close the valve in time to prevent the high-pressure gas from continuing to flow into the sampler; or the gas velocity detector outputs the detected gas velocity through an electrical signal. When the regulating valve is an automatically controlled regulating valve, it can be automatically closed when it receives an airflow signal from the gas velocity detector that the gas velocity suddenly increases or exceeds a certain value; or the gas velocity detector is a gas generator with a tubular whistle structure, which is used to emit a warning whistle when the gas velocity suddenly increases or exceeds a certain value. The operator only needs to close the valve in time after hearing the warning whistle, without having to observe the corresponding situation all the time, which can greatly get rid of the dependence on windows or visual observation.

[0047] In the present invention, the gas collector can be made of different materials according to the difference in gas hazard and pressure level, such as an air bag made of aluminum foil composite film, Teflon polyvinyl fluoride and the like, or a sampling bladder made of rubber material. Those skilled in the art understand that when the gas passing through the gas velocity detector is harmless, it is not necessary to perform closed sampling and use a gas collector.

[0048] The following combination Figure 1The sampling process is described. The sampling device involves sampling of Fischer-Tropsch synthesis reaction products, wherein the liquid sample in the high-pressure liquid storage tank 10 is Fischer-Tropsch synthesis wax, and the gas phase is mainly hydrogen, carbon monoxide, carbon dioxide, light hydrocarbons and oil vapor. The storage tank temperature is 150°C and the pressure is 3.0MPaG. Fischer-Tropsch synthesis wax is solid at room temperature and liquid at 150°C. When the liquid level of the high-pressure liquid storage tank reaches a certain height, it is necessary to sample and drain to maintain the continuous operation of the reaction device, and further test and analysis of the sample can be carried out. The amount of each sample is about 1L. The sampler 20 has a volume of about 1.5L and a handle on the side for the operator to hold. The tank body of the sampler 20 is provided with a sealing cover with a spiral structure, and the entire cover can be removed. There are two openings on the sealing cover, one of which is a liquid inlet connected to the second ball valve V-3, and the other is a gas outlet connected to the third ball valve V-4. The air bag used as the gas collector 40 is made of aluminum foil composite film. It is in a compressed state before sampling and gradually expands as the gas enters. The sampling pipeline connected to the sampler 20 at the bottom of the high-pressure liquid storage tank is also provided with a first ball valve V-1 and a regulating valve V-2 in sequence, wherein the ball valve is used to cut off and the regulating valve is used to adjust the sample flow rate. The gas outlet of the sampler 20 is connected to the inlet of the gas sounder used as the gas velocity detector 30, and the outlet of the gas sounder is connected to the inlet of the air bag, and the inlet of the air bag is provided with a fourth ball valve V-5. Before sampling, the operator should wear necessary protective equipment.

[0049] In one embodiment, the gas velocity detector is a digital vortex flowmeter as an example. Before sampling, the device is in a closed state and the relevant valves are closed. When sampling, after opening other valves, the operator slowly opens the sampling valve and observes the signal indication of the gas velocity detector. If the gas velocity is zero, it means that no liquid sample has entered the sampler; continue to open the sampling valve opening. When the gas velocity increases and stabilizes, it means that liquid sample continues to enter the sampler; if the valve opening does not increase, but the gas velocity suddenly increases, it means that the liquid sample is completely discharged and high-pressure gas begins to enter the sampler. At this time, quickly close the valve and the sampling is completed. Close the liquid inlet and outlet valves of the sampler, and close the inlet valve of the gas collector, so that the liquid sample and the collected exhaust gas can be processed separately.

[0050] In one embodiment, the regulating valve is a pneumatic regulating valve controlled by a PLC, so that it is closed when receiving an airflow signal from the gas velocity detector indicating that the gas velocity increases sharply or exceeds a certain value; when sampling, first open the second ball valve, the third ball valve and the fourth ball valve, then open the first ball valve, and then open the regulating valve to allow the liquid sample to gradually flow into the sampler and the gas collector to be gradually inflated; when the gas velocity detector gives a signal indicating that the gas velocity passing through it increases sharply or exceeds a certain value, the pneumatic regulating valve is automatically closed; then close the first shut-off valve, followed by the second valve, the third valve and the fourth valve; finally, disconnect the sampler from the high-pressure liquid storage tank between the pneumatic regulating valve and the second valve for subsequent sample transfer and analysis.

[0051] In one embodiment, the gas velocity detector is a gas sounder, specifically a tubular whistle structure. When the gas velocity passing through the gas generator is low, the whistle does not sound, and when the gas velocity is relatively high, the whistle will make a harsh sound. When sampling, first open the second valve, the third valve and the fourth valve, then open the first shut-off valve, and then open the regulating valve to allow the liquid sample to gradually flow into the sampler and the gas collector to be gradually inflated; when the gas sounder emits a warning whistle due to a sharp increase in gas velocity or exceeding a certain value, indicating that the liquid sample has been completely discharged, the regulating valve is quickly closed; then close the first shut-off valve, followed by the second valve, the third valve and the fourth valve; finally disconnect the sampler from the high-pressure liquid storage tank between the regulating valve and the second valve for subsequent sample transfer and analysis.

[0052] It is easy to understand that the above embodiments are only examples for clear explanation, and do not mean that the present invention is limited to them. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. Of course, it is not necessary and impossible to list all the implementation methods here. And other obvious changes or modifications derived from this are still within the protection scope of the present invention.

Claims

1. A device for sampling and draining high-pressure liquid, the device comprising a high-pressure liquid storage tank, a sampler, a gas velocity detector and a gas collector connected in sequence; in, The sampler comprises a tank body for storing liquid, a liquid inlet and a gas outlet are arranged on the top of the tank body of the sampler, the liquid inlet is connected to the high-pressure liquid storage tank to receive all liquid samples from the high-pressure liquid storage tank, the gas outlet is connected to the inlet of the gas velocity detector to send the gas in the tank body of the sampler into the gas velocity detector; the outlet of the gas velocity detector is connected to the inlet of the gas collector, wherein the gas velocity detector is used to give a signal indication when the velocity of the gas flow passing through it increases sharply or exceeds a certain value; Wherein, a regulating valve is provided on the connecting pipeline between the sampler inlet and the high-pressure liquid storage tank.

2. The device according to claim 1, characterized in that A first ball valve, the regulating valve and a second ball valve are sequentially arranged on the connecting pipeline between the sampler inlet and the high-pressure liquid storage tank along the logistics direction; A third ball valve is provided on the connecting pipeline between the gas outlet of the sampler and the gas velocity detector, and a fourth ball valve is provided on the connecting pipeline between the gas velocity detector and the gas collector.

3. The device according to claim 1, characterized in that The gas velocity detector is a vortex flowmeter with a display, preferably a digital vortex flowmeter.

4. The device according to claim 1, characterized in that The gas velocity detector is a gas sounder with a tubular whistle structure, which is used to emit a warning whistle sound when the gas velocity increases sharply or exceeds a certain value.

5. The device according to claim 1, characterized in that The device is not provided with an observation window. Preferably, the gas collector is an air bag or a sampling bladder.

6. The device according to claim 3, characterized in that The regulating valve is an automatically controlled regulating valve, which is closed when receiving a gas flow signal from the gas velocity detector indicating that the gas velocity increases sharply or exceeds a certain value.

7. A method for high pressure liquid sampling and cleaning using the device according to any one of claims 1 to 6, characterized in that: Open each valve in the device to allow the liquid in the high-pressure liquid storage tank to flow into the sampler, and the gas in the sampler to flow into the gas collector after passing through the gas velocity detector; when the gas velocity detector gives a signal indicating that the gas velocity passing through it increases sharply or exceeds a certain value, close the regulating valve on the connecting pipeline between the sampler inlet and the high-pressure liquid storage tank to prevent the gas in the high-pressure liquid storage tank from continuing to enter the sampler.

8. The method according to claim 7, characterized in that The material in the high-pressure liquid storage tank is a high-temperature and high-pressure material with a pressure above 0.1 MPaG and a temperature above 60°C.

9. The method according to claim 7 or 8, characterized in that: The regulating valve is an automatically controlled regulating valve, which is closed when receiving a gas velocity signal from the gas velocity detector indicating that the gas velocity increases sharply or exceeds a certain value; When sampling, first open the second ball valve, the third ball valve and the fourth ball valve, then open the first ball valve, and then open the regulating valve to allow the liquid sample to gradually flow into the sampler and the gas collector to be gradually inflated; when the gas velocity detector gives a signal indicating that the gas velocity passing through it increases sharply or exceeds a certain value, the regulating valve is automatically closed; Then close the first shut-off valve, and then close the second valve, the third valve and the fourth valve; finally disconnect the sampler from the high-pressure liquid storage tank between the regulating valve and the second valve for subsequent sample transfer and analysis.

10. The method according to claim 7 or 8, characterized in that: The gas velocity detector is a gas sounder; When sampling, first open the second valve, the third valve and the fourth valve, then open the first shut-off valve, and then open the regulating valve to allow the liquid sample to gradually flow into the sampler and the gas collector to be gradually inflated; when the gas sounder emits a warning whistle due to a sharp increase in gas velocity or exceeding a certain value, close the regulating valve; Then close the first shut-off valve, and then close the second valve, the third valve and the fourth valve; finally disconnect the sampler from the high-pressure liquid storage tank between the regulating valve and the second valve for subsequent sample transfer and analysis.

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