Natural gas sampling probe

Abstract

The utility model belongs to the technical field of natural gas sampling, and particularly discloses a natural gas sampling probe. The sampler is used for sampling liquefied natural gas. The problem that liquefied natural gas collected by an existing natural gas sampling probe cannot be ensured to enter a supercritical state before entering a gasifier is effectively solved. Comprising a sampling pipe section, a vacuum pipe section, a stainless steel capillary pipe and a pressure difference regulating valve, the sampling pipe section is connected with one end of the vacuum pipe section, and the other end of the vacuum pipe section is connected with a gasifier. The pressure difference regulating valve is arranged at the joint of the vacuum tube section and the gasifier, the stainless steel capillary tube is arranged inside the vacuum tube section and the sampling tube section, one end of the stainless steel capillary tube is connected with the free end of the sampling tube section, and the other end of the stainless steel capillary tube is connected with the gasifier. According to the utility model, the liquefied natural gas is ensured to enter a supercritical state before entering the gasifier, the liquefied natural gas is ensured to be completely vaporized in the gasifier, and the risk that part of samples are vaporized in advance is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas sampling, and in particular relates to a natural gas sampling probe. Background Art

[0002] The natural gas sampling and analysis system is a comprehensive solution that usually combines advanced sampling technology, analytical instruments, and data processing software to provide comprehensive and accurate analysis results. The natural gas sampling probe is a key component in the natural gas sampling and analysis system, which is used to collect natural gas samples at a specific location. The design, installation, and use of the natural gas sampling probe are critical to ensuring the accuracy and representativeness of the sample.

[0003] The natural gas sampling probe takes out a small amount of liquid natural gas from the natural gas transmission main, converts it into a supercritical state and sends it to the vaporizer for heating and vaporization. The existing natural gas sampling probe has the following shortcomings in actual use: the collected samples are easily affected by the heat transfer of the external environment during the transmission process, causing some samples to vaporize prematurely, and the liquid natural gas cannot be guaranteed to enter a supercritical state before entering the vaporizer, and it cannot be ensured that the liquid natural gas is completely vaporized in the vaporizer. Utility Model Content

[0004] The utility model aims to provide a natural gas sampling probe, which effectively solves the problem that the liquid natural gas collected by the existing natural gas sampling probe cannot be guaranteed to enter a supercritical state before entering a gasifier.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A natural gas sampling probe comprises a sampling pipe section, a vacuum pipe section, a stainless steel capillary and a differential pressure regulating valve. The sampling pipe section is connected to one end of the vacuum pipe section, and the other end of the vacuum pipe section is connected to a gasifier.

[0007] The differential pressure regulating valve is arranged at the connection between the vacuum pipe section and the vaporizer, the stainless steel capillary is arranged inside the vacuum pipe section and the sampling pipe section, one end of the stainless steel capillary is connected to the free end of the sampling pipe section, and the other end of the stainless steel capillary is connected to the vaporizer.

[0008] Furthermore, a maintenance shut-off valve is provided inside the vacuum pipe section, and the maintenance shut-off valve is provided at a position 75 mm above the flange of the sampling pipe section.

[0009] Furthermore, the maintenance stop valve comprises a valve body and a valve stem handle, and the valve body and the valve stem handle are both arranged in the vacuum chamber of the vacuum pipe section.

[0010] Furthermore, a pneumatic shut-off valve is provided inside the vacuum pipe section, and the pneumatic shut-off valve is provided between the maintenance shut-off valve and the pressure differential regulating valve.

[0011] Furthermore, the stainless steel capillary is wavy and has been subjected to sulfur passivation treatment.

[0012] Furthermore, the vacuum tube section, sampling tube section and stainless steel capillary are all made of 316L stainless steel.

[0013] Compared with the prior art, the beneficial technical effects of the utility model are:

[0014] (1) The utility model installs a pressure difference regulating valve at the connection between the vacuum pipe section and the vaporizer, thereby adjusting the flow area of ​​liquefied natural gas before entering the vaporizer, so as to ensure that the liquefied natural gas enters a supercritical state before entering the vaporizer, and ensure that the liquefied natural gas is completely vaporized in the vaporizer.

[0015] (2) The utility model adopts a vacuum pipe section cooling method from the sampling pipe section to the vaporizer, thereby meeting the sampling supercooling requirements and ensuring that the collected samples are minimally affected by the heat transfer from the external environment during the transmission process, thereby reducing the risk of premature vaporization of some samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0017] A natural gas sampling probe, such as Figure 1 As shown, it includes a sampling pipe section 1, a vacuum pipe section 2, a stainless steel capillary 3 and a differential pressure regulating valve 4. The sampling pipe section 1 is connected to one end of the vacuum pipe section 2, and the other end of the vacuum pipe section 2 is connected to a vaporizer 5.

[0018] The differential pressure regulating valve 4 is arranged at the connection between the vacuum pipe section 2 and the vaporizer 5. The differential pressure regulating valve 4 is used to adjust the flow area of ​​the liquefied natural gas before entering the vaporizer 5, so as to ensure that the liquefied natural gas enters a supercritical state before entering the vaporizer 5, and ensure that the liquefied natural gas is completely vaporized in the vaporizer 5.

[0019] The stainless steel capillary 3 is arranged inside the vacuum tube section 2 and the sampling tube section 1 , one end of the stainless steel capillary 3 is connected to the free end of the sampling tube section 1 , and the other end of the stainless steel capillary 3 is connected to the vaporizer 5 .

[0020] In some specific embodiments, the sampling tube section 1, the vacuum tube section 2 and the stainless steel capillary 3 are all made of low temperature resistant 316L stainless steel. The stainless steel capillary 3 is 1 / 8 inch and has a wavy structure. The wavy structure design makes the stainless steel capillary 3 easy to maintain and reduces pressure shock. The pipeline connected to the stainless steel capillary 3 in the vaporizer 5 is 1 / 4 inch 316L stainless steel.

[0021] The stainless steel capillary 3 and the pipeline connected to the stainless steel capillary 3 in the gasifier 5 need to be subjected to sulfur passivation treatment. The advantages of sulfur passivation treatment are: preventing the sulfur components in the liquid natural gas from being adsorbed on the stainless steel surface, thereby affecting the composition of the gaseous natural gas components, and also improving the corrosion resistance of the natural gas sampling probe and extending its service life. Sulfur passivation treatment forms a stable passivation film on the surface of the pipeline, which can effectively isolate the pipeline from the corrosive sulfur compounds in the natural gas, thereby reducing or preventing the pipeline from being corroded. This is particularly important for sampling probes working in a natural gas environment with a high sulfur content, because sulfur compounds tend to have a strong corrosive effect on metal pipelines. In addition, sulfur passivation treatment can also improve the sampling performance of the sampling probe. Due to the formation of the passivation film, the pipeline surface becomes smoother, which helps to reduce the resistance during sampling and improve the accuracy and efficiency of sampling.

[0022] In some specific embodiments, a maintenance stop valve 6 is provided inside the vacuum pipe section 2, and the maintenance stop valve 6 is provided near the connection between the vacuum pipe section 2 and the sampling pipe section 1. In this embodiment, the maintenance stop valve is provided about 75 mm above the flange of the sampling pipe section. The maintenance stop valve 6 includes a valve body and a valve stem handle, and the valve body and the valve stem handle are both provided in the vacuum chamber of the vacuum pipe section 2 to reduce the heat loss of the sample. The valve can be closed by a special handle, and online maintenance can be performed after closing the maintenance stop valve 6.

[0023] In some specific embodiments, a pneumatic shut-off valve 7 is provided inside the vacuum pipe section 2, and the pneumatic shut-off valve 7 is provided between the maintenance shut-off valve 6 and the pressure differential regulating valve 4. The pneumatic shut-off valve 7 can be operated automatically and manually to meet the needs of daily operation and cutting off sampling in an emergency.

[0024] The utility model takes out a small amount of liquefied natural gas from the natural gas transmission main pipe through the sampling pipe section 1, and converts the liquefied natural gas into a supercritical state by cooling the vacuum pipe section 2 and adjusting the flow area through the pressure difference regulating valve 4, and sends it to the vaporizer 5 for heating and vaporization. The vacuum pipe section 2 is used for cooling from the sampling pipe section 1 to the vaporizer 5, which not only meets the sampling supercooling requirements, but also ensures that the collected samples are not affected by the heat transfer of the external environment to a minimum during the transmission process, thereby reducing the risk of premature vaporization of some samples.

[0025] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A natural gas sampling probe, characterized in that: It comprises a sampling pipe section, a vacuum pipe section, a stainless steel capillary and a pressure difference regulating valve, wherein the sampling pipe section is connected to one end of the vacuum pipe section, and the other end of the vacuum pipe section is connected to a vaporizer; The differential pressure regulating valve is arranged at the connection between the vacuum pipe section and the vaporizer, the stainless steel capillary is arranged inside the vacuum pipe section and the sampling pipe section, one end of the stainless steel capillary is connected to the free end of the sampling pipe section, and the other end of the stainless steel capillary is connected to the vaporizer.

2. The natural gas sampling probe according to claim 1, characterized in that: A maintenance shut-off valve is provided inside the vacuum pipe section, and the maintenance shut-off valve is arranged at a position 75 mm above the flange of the sampling pipe section.

3. The natural gas sampling probe according to claim 2, characterized in that: The maintenance stop valve comprises a valve body and a valve stem handle, and the valve body and the valve stem handle are both arranged in the vacuum cavity of the vacuum pipe section.

4. The natural gas sampling probe according to claim 3, characterized in that: A pneumatic shut-off valve is provided inside the vacuum pipe section, and the pneumatic shut-off valve is arranged between the maintenance shut-off valve and the pressure difference regulating valve.

5. The natural gas sampling probe according to claim 4, characterized in that: The stainless steel capillary is wavy and has been subjected to sulfur passivation treatment.

6. The natural gas sampling probe according to claim 5, characterized in that: The vacuum tube section, sampling tube section and stainless steel capillary are all made of 316L stainless steel.

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