A natural gas safety sampler valve and its use method

Abstract

The present invention discloses a natural gas safety sampler valve, including a sampler valve, a sampling probe is arranged at the bottom of the sampler valve, the gas outlet end of the sampling probe is connected to the main stop valve through the main channel, the main stop valve is arranged on the sampler valve, and the main stop valve is connected to the first secondary channel; the first one-way valve quick connector is connected to the first sampling conduit; the first emptying stop valve is connected to the sewage channel provided on the sampler valve, and a sewage pipe is arranged at the sewage channel. On the one hand, the present invention can effectively prevent the pressurized gas from being sprayed to the surroundings to poison the operator or cause a safety accident; on the other hand, during the sampling process, the sampling pressure of the natural gas can be checked while reducing the thread wear, thereby extending the service life; on the other hand, it effectively improves the extraction purity, improves the analysis accuracy and reduces the labor intensity of the operator.

Description

Technical Field

[0001] The invention relates to a sampling structure, in particular to a safety sampler valve for natural gas and a use method thereof. Background Art

[0002] The natural gas sampling valve is an instrument valve used to obtain gas quality samples in the natural gas pipeline. It is used in situations where it is necessary to frequently perform gas quality analysis on natural gas for hydrogen sulfide, total sulfur, carbon dioxide and other components such as mercury and radioactive gases.

[0003] In the existing natural gas sampling technology, there is no special sampling valve. When sampling, the pressure gauge stop valve is turned off, the pressure gauge is disassembled, and then the sampling catheter is connected to the pressure gauge threaded interface for sampling. The existing sampling technology has the following defects:

[0004] 1) Because there is only one stop valve and no discharge valve, when the pressure gauge is disassembled, there is pressurized natural gas in the pipeline between the stop valve and the pressure gauge. When the connecting thread is loosened, the pressurized gas will spray all around, and the sampling personnel may easily inhale the natural gas and be poisoned; if the sampling pipe section is high-pressure (≥10MPa) natural gas, the pressure gauge may spray out when it is disassembled, causing a safety accident with casualties.

[0005] 2) When sampling is completed, there is no special discharge valve, and a large amount of pressurized natural gas remains in the sampling tube. When the connection joint is removed, the dangerous situation described above also exists. In addition, under high pressure, the sampling tube will swing around like a whip, causing safety accidents with casualties.

[0006] 3) In the existing natural gas sampling technology, because the pressure gauge interface is connected to the sampling tube, the natural gas sampling pressure cannot be checked during the sampling process, and the sampling personnel can only rely on their experience to judge whether it meets the requirements; and the frequent disassembly of the threaded joints aggravates the wear of the threads, shortens the service life of the threads, and brings great hidden dangers to production safety.

[0007] 4) In the existing natural gas sampling technology, the natural gas samples obtained flow out from the pipe wall. Since the natural gas scours and corrodes the pipe wall for a long time, the sampled natural gas is impure, which has a certain misleading effect on the results of sample analysis.

[0008] 5) The existing natural gas sampling method has high labor intensity and long sampling time for operators. Each sampling time at each point is about 30 minutes, and the sampling efficiency is low. Especially in the wild in summer, the surface temperature can reach above 50℃. The longer the sampling personnel stay, the more likely they are to suffer from heatstroke.

[0009] Therefore, those skilled in the art are committed to developing a safe sampler for natural gas and a method for using the same which can effectively improve safety performance. Summary of the invention

[0010] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a safety sampler for natural gas and a method for using the same which can effectively improve the safety performance.

[0011] To achieve the above-mentioned object, the present invention provides a natural gas safety sampler valve, comprising a sampler valve, a sampling probe is arranged at the bottom of the sampler valve, the gas outlet end of the sampling probe is connected to a main stop valve through a main channel, the main stop valve is arranged on the sampler valve, and the main stop valve is connected to a first secondary channel;

[0012] The sampler valve is provided with a first sampling stop valve, a first one-way valve quick connector and a first emptying stop valve; the first sampling stop valve is simultaneously connected to the first secondary channel, the first one-way valve quick connector and the first emptying stop valve; the first one-way valve quick connector is connected to the first sampling catheter; the first emptying stop valve is connected to a sewage channel opened on the sampler valve, and a sewage pipe is provided at the sewage channel.

[0013] Preferably, the sampler valve is provided with a second sampling stop valve, a second one-way valve quick connector and a second emptying stop valve; the second sampling stop valve is connected to the main channel and the second one-way valve quick connector at the same time; the second one-way valve quick connector is connected to the second sampling conduit; the second emptying stop valve is connected to the sewage channel and the second sampling stop valve.

[0014] Preferably, the outer wall of the sampler valve is provided with eight mounting surfaces, and the eight mounting surfaces are connected end to end and arranged in a circular array around the center line of the sampler valve;

[0015] The main stop valve, the first sampling stop valve, the first one-way valve quick connector, the first emptying stop valve, the drain pipe, the second sampling stop valve, the second one-way valve quick connector and the second emptying stop valve are respectively arranged on each installation surface, and the sampling probe is arranged at the bottom end of the sampler valve.

[0016] Preferably, a second secondary channel communicating with the first secondary channel is provided at the top of the sampler valve, and the second secondary channel is connected to the pressure gauge via a pressure gauge joint.

[0017] Preferably, the main stop valve and the drain pipe are symmetrically arranged, the drain pipe is located between the first emptying stop valve and the second emptying stop valve, the first emptying stop valve and the second sampling stop valve are symmetrically arranged, the second emptying stop valve and the first sampling stop valve are symmetrically arranged, and the first one-way valve quick connector and the second one-way valve quick connector are symmetrically arranged.

[0018] Preferably, the natural gas safety sampler valves are made of stainless steel.

[0019] A method for using a natural gas safety sampler valve comprises the following steps:

[0020] S1: Install the sampler valve on the pipeline;

[0021] S2: Pressurized natural gas medium enters the sampler valve through the sampling probe;

[0022] S3: Open the main stop valve, the medium pressure is displayed on the pressure gauge, and enters the inlet end of the first sampling stop valve. Open the first sampling stop valve, and the medium enters the inlet end of the first one-way valve quick connector and the inlet end of the first emptying stop valve;

[0023] S4: inserting the first sampling catheter into the first one-way valve quick connector, at which time the ejector pin of the first sampling catheter connector pushes open the steel ball in the one-way valve, and introduces the medium into the sampling cylinder to complete the sampling;

[0024] S5: When exhausting the pressurized gas, first close the stop valve of the sampling cylinder, and then close the first sampling stop valve;

[0025] S6: Open the first drain stop valve to discharge the pressurized medium between the first sampling conduit and the first sampling stop valve through the drain pipe;

[0026] S7: After the discharge is completed, remove the first sampling catheter at the first one-way valve quick connector to complete the emptying, and finally close the first emptying stop valve.

[0027] As a preferred embodiment, the pressure gauge is also replaced, and the specific steps of replacement are as follows:

[0028] SS1: When the pressure gauge needs to be replaced, first close the main stop valve and open the first sampling stop valve;

[0029] SS2: Open the first drain stop valve to discharge the pressurized medium between the main stop valve and the pressure gauge through the drain pipe;

[0030] SS3: After the discharge is completed, remove the pressure gauge and replace it with a new one;

[0031] SS4: Close the first drain stop valve, then close the first sampling stop valve, and finally open the main stop valve, so that the pressurized medium enters the sampler valve and completes the replacement of the pressure gauge.

[0032] Preferably, in S1, the sampling probe is inserted to one third of the pipeline.

[0033] Preferably, in S3, the medium enters the inlet end of the first sampling stop valve and the second sampling stop valve, the first sampling stop valve and the second sampling stop valve are opened, and the medium enters the inlet end of the first one-way valve quick connector and the inlet end of the first emptying stop valve;

[0034] In S4, the first sampling catheter and the second sampling catheter are respectively inserted into the first one-way valve quick connector and the second one-way valve quick connector. At this time, the ejector pins of the first sampling catheter and the second sampling catheter connector respectively push open the steel balls in each one-way valve, and introduce the medium into the sampling cylinder to complete the sampling.

[0035] The beneficial effects of the present invention are as follows: on the one hand, the present invention can effectively prevent pressurized gas from being sprayed around and causing poisoning of operators or safety accidents; on the other hand, during the sampling process, the sampling pressure of natural gas can be checked while reducing thread wear, thereby extending the service life; on the other hand, the extraction purity is effectively improved, the analysis accuracy is improved, and the labor intensity of operators is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0037] Figure 2 yes Figure 1 Schematic diagram of the structure without pressure gauge connector and pressure gauge installed.

[0038] Figure 3 yes Figure 2 Schematic diagram of the top view structure.

[0039] Figure 4 It is a cross-sectional structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0041] like Figures 1 to 4 As shown, a natural gas safety sampler valve comprises a sampler valve 1, a sampling probe 2 is arranged at the bottom of the sampler valve 1, a gas outlet end of the sampling probe 2 is connected to a main stop valve 3 through a main channel 5, the main stop valve 3 is arranged on the sampler valve 1, and the main stop valve 3 is connected to a first secondary channel 6;

[0042] The present invention adopts a one-way valve design, which can ensure that the natural gas in the pipeline will not leak when the sampling stop valve cannot be closed. In addition, the sampling port and the sampling conduit are connected using a fast one-way valve structure, which can achieve a safe and reliable connection within 2 seconds.

[0043] The sampling probe 2 in the present invention is a 316L stainless steel pipe with a diameter of 6 mm, which complies with the requirements of Article 8.1 of the "Guidelines for Natural Gas Sampling" GB / T13609-2012. This design prevents liquid or impurities near the pipe wall from entering the sampling bottle, ensuring that the gas sample comes from the middle of the pipe, ensuring the authenticity and representativeness of the sample.

[0044] The sampler valve 1 is provided with a first sampling stop valve 10, a first one-way valve quick connector 7 and a first emptying stop valve 8; the first sampling stop valve 10 is connected to the first secondary channel 6, the first one-way valve quick connector 7 and the first emptying stop valve 8 at the same time; the first one-way valve quick connector 7 is connected to the first sampling conduit 11; the first emptying stop valve 8 is connected to the sewage channel provided on the sampler valve 1, and a sewage pipe 12 is provided at the sewage channel. The sewage pipe 12 is to prevent the natural gas from being discharged directly to people, so as to ensure the personal safety of the sampling personnel.

[0045] The sampler valve 1 is provided with a second sampling stop valve 13, a second one-way valve quick connector 15 and a second emptying stop valve 16; the second sampling stop valve 13 is connected to the main channel 5 and the second one-way valve quick connector 15 at the same time; the second one-way valve quick connector 15 is connected to the second sampling conduit 17; the second emptying stop valve 16 is connected to the sewage channel and the second sampling stop valve 13.

[0046] The present invention can sample in parallel at the same time to ensure the accuracy of the samples taken at the sampling point and comply with the regulations of the natural gas quality analysis laboratory. When sampling is performed at both sides at the same time, the samples taken are the same natural gas at the same sampling point and at the same time. When the error between the analysis results of the two samples is very small, it means that the sample analysis data at this point is accurate.

[0047] The upper and lower ends of the sampler valve are American sealed pipe threads 1 / 2"-14NPT internal threads, which can be connected to various types of joints. When the pressure gauge needs to be replaced, just turn off the main stop valve, and then open the sampling stop valve and the drain stop valve on the same side to drain the internal natural gas. The operator can replace the pressure gauge safely and confidently.

[0048] The outer wall of the sampler valve 1 is provided with eight mounting surfaces 18, and the eight mounting surfaces 18 are connected end to end and arranged in a circular array around the center line of the sampler valve 1;

[0049] The main stop valve 3, the first sampling stop valve 10, the first one-way valve quick connector 7, the first emptying stop valve 8, the drain pipe 12, the second sampling stop valve 13, the second one-way valve quick connector 15 and the second emptying stop valve 16 are respectively arranged on each mounting surface 18, and the sampling probe 2 is arranged at the bottom end of the sampler valve 1.

[0050] A second secondary channel 19 communicating with the first secondary channel 6 is provided at the top of the sampler valve 1 . The second secondary channel 19 is connected to a pressure gauge 21 via a pressure gauge connector 20 .

[0051] The main stop valve 3 and the drain pipe 12 are symmetrically arranged, the drain pipe 12 is located between the first emptying stop valve 8 and the second emptying stop valve 16, the first emptying stop valve 8 and the second sampling stop valve 13 are symmetrically arranged, the second emptying stop valve 16 and the first sampling stop valve 10 are symmetrically arranged, and the first one-way valve quick connector 7 and the second one-way valve quick connector 15 are symmetrically arranged.

[0052] In the present invention, sealing rings are provided at the joints of various components, and the material of each sealing ring is hydrogenated nitrile HNBR material that is resistant to sulfur compounds, so as to ensure long-term sealing in a sulfur environment. In addition, since there may be a small amount of sulfur compounds, mercury, carbon dioxide, etc. in natural gas, the sampling device is made of stainless steel as a whole, which meets the relevant requirements of Article 6.1 of the "Guidelines for Natural Gas Sampling" GB / T13609-2012.

[0053] Table 1 shows the performance parameters:

[0054] Nominal pressure 16MPa Nominal diameter DN5 Operating temperature -40℃～230℃ Sealing test pressure 18MPa Shell seal test pressure 24MPa

[0055] Table 1

[0056] A method for using a natural gas safety sampler valve comprises the following steps:

[0057] S1: Install the sampler valve on the pipe 22; insert the sampling probe 2 to one third of the pipe 22.

[0058] S2: Pressurized natural gas medium enters the sampler valve through sampling probe 2;

[0059] S3: Open the main stop valve 3, the medium pressure is displayed on the pressure gauge 21, and enters the inlet end of the first sampling stop valve 10. Open the first sampling stop valve 10, and the medium enters the inlet end of the first one-way valve quick connector 7 and the inlet end of the first emptying stop valve 8;

[0060] S4: Due to the flow direction of the one-way valve, it is in a closed state. Insert the first sampling catheter 11 into the first one-way valve quick connector 7. At this time, the ejector pin of the first sampling catheter 11 connector pushes open the steel ball in the one-way valve, and introduces the medium into the sampling cylinder to complete the sampling;

[0061] The medium enters the inlet end of the first sampling stop valve 10 and the second sampling stop valve 13, the first sampling stop valve 10 and the second sampling stop valve 13 are opened, and the medium enters the inlet end of the first one-way valve quick connector 7 and the inlet end of the first emptying stop valve 8;

[0062] In S4, the first sampling catheter 11 and the second sampling catheter 17 are respectively inserted into the first one-way valve quick connector 7 and the second one-way valve quick connector 15. At this time, the ejector pins of the first sampling catheter 11 and the second sampling catheter 17 connector respectively push open the steel balls in each one-way valve, and introduce the medium into the sampling cylinder to complete the sampling.

[0063] The present invention can effectively protect the personal safety of operators and achieve the effect of fast, convenient and parallel sampling. The sampler valve is simple to operate, has low labor intensity and short sampling time. Each sampling time is about 5 minutes. During the sampling process, the pressure can be checked in real time to ensure that the pressure of the sample meets the requirements.

[0064] The present invention includes 5 stop valves, namely a main stop valve 3, a first sampling stop valve 10, a first emptying stop valve 8, a second emptying stop valve 16 and a second sampling stop valve 13, which are controlled by a first one-way valve quick connector 7 and a second one-way valve quick connector 15. The main stop valve 3 functions to open and close the sampled natural gas. When the main stop valve 3 is opened, the pressure of the natural gas in the delivery pipeline can be observed through a pressure gauge 21. When sampling, open the sampling stop valve at either end, and then push open the one-way valve through the connecting joint of the sampling conduit to perform sampling. When the sampling bottle is filled with samples that meet the requirements, first turn off the stop valve of the sampling bottle, then turn off the sampling stop valve, and then open the emptying stop valve on the same side, and discharge the natural gas in the sampling conduit from the sewage pipe to ensure the safety of the sampling personnel and will not cause the loss of natural gas in the main pipeline. Similarly, when sampling is required from the other side, the steps are the same as above.

[0065] The present invention has the following beneficial effects:

[0066] 1. The sampler valve is a special natural gas sampling equipment, which fills the gap in the current domestic market and meets the needs of users for safe, fast and simple natural gas sampling.

[0067] 2. The sampler valve is designed with a main stop valve, a sampling valve, and a discharge valve. When the main stop valve is turned off and the sampling valve and the discharge valve are opened, the high-pressure gas in the sampler valve and the sampling conduit is emptied. In this way, whether the pressure gauge is replaced or the sampling conduit is disassembled, the high-pressure gas injection in the prior art can be prevented, ensuring the personal safety of the sampling personnel.

[0068] 3. Because the sampler valve is designed with a special sampling port, it avoids the frequent disassembly of the connecting thread in the prior art, eliminates the wear of the thread, and brings great protection to safe production.

[0069] 4. The sampling port of the sampler valve adopts a one-way valve quick connector, and the connection time is about 2 seconds. The fast connection shortens the sampling time to about 5 minutes, greatly improving work efficiency.

[0070] 5. The sampler valve adopts a design of sampling ports on both sides, which can be sampled in parallel, ensuring the accuracy of experimental data analysis and compliance with relevant laboratory regulations.

[0071] 6. The threads on both ends of the sampler valve are 1 / 2"-14NPT American sealed pipe threads, which can be easily and reliably connected to any type of connector, making the connection easier.

[0072] 7. The downward-facing drain pipe of the sampler valve avoids personal injury caused by the spraying of high-pressure natural gas during emptying.

[0073] 8. The sampling probe inserted into the main pipeline at 1 / 3 complies with the requirements of Article 8.1 of the "Guidelines for Natural Gas Sampling" GB / T13609-2012, so that the gas quality sample comes from the middle of the pipeline, ensuring the authenticity and representativeness of the sample.

[0074] 9. The overall 316L material and hydrogen sulfide resistant O-ring greatly increase the service life of the product and reduce the sampling cost.

[0075] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A natural gas safety sampler valve, characterized by: The sampler valve (1) comprises a sampling probe (2) arranged at the bottom of the sampler valve (1), the gas outlet end of the sampling probe (2) is connected to a main stop valve (3) through a main channel (5), the main stop valve (3) is arranged on the sampler valve (1), and the main stop valve (3) is connected to a first secondary channel (6); The sampler valve (1) is provided with a first sampling stop valve (10), a first one-way valve quick connector (7) and a first emptying stop valve (8); the first sampling stop valve (10) is simultaneously connected to the first secondary channel (6), the first one-way valve quick connector (7) and the first emptying stop valve (8); the first one-way valve quick connector (7) is connected to a first sampling conduit (11); the first emptying stop valve (8) is connected to a sewage discharge channel provided on the sampler valve (1), and a sewage discharge pipe (12) is provided at the sewage discharge channel; The sampler valve (1) is provided with a second sampling stop valve (13), a second one-way valve quick connector (15) and a second drain stop valve (16); the second sampling stop valve (13) is connected to the main channel (5) and the second one-way valve quick connector (15) at the same time; the second one-way valve quick connector (15) is connected to a second sampling conduit (17); the second drain stop valve (16) is connected to the drain channel and the second sampling stop valve (13); The outer wall of the sampler valve (1) is provided with eight mounting surfaces (18), and the eight mounting surfaces (18) are connected end to end and arranged in a circular array around the center line of the sampler valve (1); The main stop valve (3), the first sampling stop valve (10), the first one-way valve quick connector (7), the first emptying stop valve (8), the sewage pipe (12), the second sampling stop valve (13), the second one-way valve quick connector (15) and the second emptying stop valve (16) are respectively arranged on each mounting surface (18), and the sampling probe (2) is arranged at the bottom end of the sampler valve (1); The top end of the sampler valve (1) is provided with a second secondary channel (19) communicating with the first secondary channel (6); the second secondary channel (19) is connected to a pressure gauge (21) via a pressure gauge connector (20); The main stop valve (3) and the drain pipe (12) are symmetrically arranged, the drain pipe (12) is located between the first emptying stop valve (8) and the second emptying stop valve (16), the first emptying stop valve (8) and the second sampling stop valve (13) are symmetrically arranged, the second emptying stop valve (16) and the first sampling stop valve (10) are symmetrically arranged, and the first one-way valve quick connector (7) and the second one-way valve quick connector (15) are symmetrically arranged; The method of using the natural gas safety sampler valve includes the following steps: S1: Install the sampler valve on the pipe (22); S2: The pressurized natural gas medium enters the sampler valve through the sampling probe (2); S3: Open the main stop valve (3), the medium pressure is displayed on the pressure gauge (21), and enters the inlet end of the first sampling stop valve (10), and the first sampling stop valve (10) is opened, and the medium enters the inlet end of the first one-way valve quick connector (7) and the inlet end of the first drain stop valve (8); S4: inserting the first sampling catheter (11) into the first one-way valve quick connector (7), at which time the ejector pin of the connector of the first sampling catheter (11) pushes open the steel ball in the one-way valve, and introduces the medium into the sampling cylinder to complete the sampling; S5: When the pressurized gas is to be exhausted, the stop valve of the sampling cylinder is first closed, and then the first sampling stop valve (10) is closed; S6: Open the first drain stop valve (8) to discharge the pressurized medium between the first sampling conduit (11) and the first sampling stop valve (10) through the drain pipe (12); S7: After the discharge is completed, the first sampling conduit (11) at the first one-way valve quick connector (7) is removed to complete the emptying, and finally the first emptying stop valve (8) is closed.

2. The natural gas safety sampler valve according to claim 1, characterized in that: The natural gas safety sampler valves are all made of stainless steel.

3. The natural gas safety sampler valve according to claim 1, characterized in that: The method also includes replacing the pressure gauge (21), and the specific steps of the replacement are as follows; SS1: When the pressure gauge needs to be replaced, first close the main stop valve (3) and open the first sampling stop valve (10); SS2: Open the first drain stop valve (8) to discharge the pressurized medium between the main stop valve (3) and the pressure gauge (21) through the drain pipe (12); SS3: After the discharge is completed, remove the pressure gauge (21) and replace it with a new pressure gauge (21); SS4: Close the first drain stop valve (8), then close the first sampling stop valve (10), and finally open the main stop valve (3) to allow the pressurized medium to enter the sampler valve, completing the replacement of the pressure gauge.

4. The natural gas safety sampler valve according to claim 3, characterized in that: In S1, the sampling probe (2) is inserted into the pipeline (22) to one third of the way there.

5. The natural gas safety sampler valve according to claim 3, characterized in that: In S3, the medium enters the inlet ends of the first sampling stop valve (10) and the second sampling stop valve (13), the first sampling stop valve (10) and the second sampling stop valve (13) are opened, and the medium enters the inlet end of the first one-way valve quick connector (7) and the inlet end of the first emptying stop valve (8); In S4, the first sampling conduit (11) and the second sampling conduit (17) are respectively inserted into the first one-way valve quick connector (7) and the second one-way valve quick connector (15). At this time, the ejector pins of the first sampling conduit (11) and the second sampling conduit (17) connectors respectively push open the steel balls in the one-way valves, and introduce the medium into the sampling cylinder to complete the sampling.

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