Natural gas sampling device for detection and analysis

Abstract

The utility model relates to a natural gas sampling device for detection and analysis, which comprises a storage sampling bottle comprising an outer side heat insulation layer for accommodating a storage inner container and a buffer inner container; the storage liner is configured to store the collected natural gas; the buffer liner is configured to store the decompressed natural gas; the first heating cavity is located between the storage inner container and the outer side heat preservation layer and contains a heat conduction medium. The second heating cavity is located between the buffering inner container and the outer side heat preservation layer and contains a heat conduction medium. The constant pressure valve is arranged between the storage inner container and the buffer inner container; a first heating assembly; and a second heating assembly. The natural gas sampling device disclosed by the utility model is provided with the heating assembly, and the natural gas stored in the sampling bottle is heated to the temperature required by detection and is maintained at the temperature, so that the temperature of the natural gas entering the gas chromatograph can meet the detection requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas sampling, in particular to a natural gas sampling device for detection and analysis. Background Art

[0002] In the process of natural gas extraction, in order to detect the product quality of natural gas, it is necessary to use a sampler to take out a certain amount of samples from the sampling port of the transmission pipeline and send them to the laboratory for analysis and testing. During the test, the sampler is connected to the gas chromatograph to transport natural gas to the gas chromatograph. During the test, the temperature and pressure of the sample when it enters the gas chromatograph will affect the detection accuracy. It usually needs to be heated to a certain temperature and the pressure needs to be kept stable during injection. For temperature, the common treatment method is to heat the sampling bottle in a water bath during detection, but this will produce steam. When the gas chromatograph is in this environment, it is inevitable that water vapor will enter the gas chromatograph, and the accuracy of the detection and analysis will be affected. For pressure, a pressure reducing valve is usually set at the outlet of the sampler to control the gas pressure when entering the gas chromatograph. There is only one control level. If the pressure reducing valve is damaged, the pressure control fails, which will affect the test results.

[0003] Therefore, there is an urgent need for a natural gas sampling device that can accurately control the temperature of natural gas and maintain a stable injection pressure. Utility Model Content

[0004] In order to solve at least part of the above problems in the prior art, the utility model provides a natural gas sampling device for detection and analysis, comprising:

[0005] Storage sampling bottles, which include:

[0006] An outer insulation layer, which accommodates a storage liner and a buffer liner;

[0007] a storage tank configured to store collected natural gas;

[0008] a buffer liner configured to store depressurized natural gas;

[0009] A first heating chamber, which is located between the storage liner and the outer insulation layer and contains a heat-conducting medium; and

[0010] A second heating chamber, which is located between the buffer liner and the outer insulation layer and contains a heat-conducting medium;

[0011] A constant pressure valve, which is disposed between the storage liner and the buffer liner and is configured to reduce the pressure of the natural gas in the storage liner and release it into the buffer liner, and maintain the pressure in the buffer liner at a set value;

[0012] a first heating assembly configured to heat the heat transfer medium in the first heating chamber and the second heating chamber to heat the natural gas in the storage liner and the buffer liner; and

[0013] The second heating component is configured to keep the heated natural gas in the storage liner and the buffer liner warm.

[0014] Furthermore, there is a gap between the storage liner and the outer insulation layer;

[0015] There is a gap between the buffer liner and the outer insulation layer;

[0016] A plurality of partitions are arranged between the storage liner and the outer insulation layer and between the buffer liner and the outer insulation layer, wherein the partitions, the storage liner and the outer insulation layer constitute the first heating chamber, and the partitions, the buffer liner and the outer insulation layer constitute the second heating chamber.

[0017] Further, the partition connects the inner wall of the outer insulation layer and the side wall of the storage liner, and the partition is adjacent to both ends of the storage liner;

[0018] The partition connects the inner wall of the outer heat-insulating layer and the side wall of the buffer liner, and the partition is adjacent to two ends of the buffer liner.

[0019] Furthermore, the first heating component comprises:

[0020] A first power interface, which is arranged on the outer insulation layer and is used for connecting to an external power source;

[0021] A first heating wire, connected to the first power interface and located in the first heating chamber and the second heating chamber;

[0022] The second heating assembly comprises:

[0023] A second power interface, which is arranged on the outer insulation layer and is used for connecting to an external power source;

[0024] A second heating wire, connected to the second power interface and located in the first heating chamber and the second heating chamber;

[0025] Furthermore, the first power interface and the second power interface are both provided with switches to control power on and off.

[0026] Furthermore, it also includes:

[0027] A first temperature detector, which is used to detect the temperature in the storage tank and is signal-connected to the first power interface and the second power interface;

[0028] The second temperature detector is used to detect the temperature in the buffer liner and is connected to the first power interface and the second power interface by signal.

[0029] Furthermore, a plurality of fixing components made of insulating material are arranged on the inner wall of the outer thermal insulation layer.

[0030] Furthermore, a plurality of the first heating wires and the second heating wires are spirally wound around the storage liner and the buffer liner, and are fixed by the fixing component and immersed in the heat-conducting medium, wherein the first heating wires and the second heating wires do not contact each other.

[0031] Furthermore, some of the partitions are provided with mounting holes, and one end of the first heating wire and the second heating wire is fixed in the mounting holes;

[0032] A sealing member is arranged in the mounting hole.

[0033] Furthermore, it also includes:

[0034] A sample inlet tube connected to the inlet of the storage liner;

[0035] An inlet pressure reducing valve, which is arranged on the sample inlet tube;

[0036] A sample outlet tube connected to the outlet of the buffer liner;

[0037] An outlet pressure reducing valve, which is arranged on the sample outlet pipe;

[0038] A first pressure gauge, which is used to detect the gas pressure in the storage tank;

[0039] A second pressure gauge, which is used to detect the gas pressure in the buffer liner;

[0040] The outlet pressure gauge is arranged on the sample outlet pipe and is used to detect the pressure of the natural gas entering the detection instrument. The utility model has at least the following beneficial effects: the natural gas sampling device disclosed in the utility model is provided with a group of heating components to heat the natural gas stored in the sampling bottle to the temperature required for detection and maintain the temperature to ensure that the temperature of the natural gas entering the gas chromatograph meets the detection requirements; (2) the natural gas is heated by electric heating, which avoids the defect of water bath heating that produces water vapor and affects the detection; (3) a buffer tank and a constant pressure valve are provided, and the original high-pressure gas is gradually reduced to the required pressure through the constant pressure valve. When the gas is reduced during the detection process, it will automatically be supplemented by the constant pressure valve to ensure that the pressure in the buffer tank is constant, and the natural gas in the buffer tank is transported to the instrument through the pressure reducing valve at the sample outlet pipe, which provides double insurance and can obtain a more stable gas source. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to further illustrate the above and other advantages and features of various embodiments of the present invention, a more specific description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be considered as limiting the scope thereof. In the accompanying drawings, for clarity, identical or corresponding parts will be represented by identical or similar reference numerals.

[0042] Figure 1 A schematic structural diagram of a natural gas sampling device for detection and analysis according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0043] It should be noted that various components in the various drawings may be shown exaggeratedly for illustrative purposes and are not necessarily correct to scale.

[0044] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be understood as limiting.

[0045] In the present invention, unless otherwise specified, the quantifiers "a", "an" and "an" do not exclude the presence of multiple elements.

[0046] It should also be pointed out that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the parts or components may be shown, but a person of ordinary skill in the art will understand that, under the guidance of the present invention, required parts or components may be added according to the needs of specific scenarios.

[0047] It should also be pointed out that within the scope of the present invention, the terms "same", "equal", "equal to" and the like do not mean that the two values ​​are absolutely equal, but allow a certain reasonable error, that is, the terms also cover "substantially the same", "substantially equal", and "substantially equal to".

[0048] It should also be pointed out that in the description of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as explicitly or implicitly indicating relative importance.

[0049] In addition, the embodiments of the present invention describe the process steps in a specific order, but this is only for the convenience of distinguishing the steps, and does not limit the order of the steps. In different embodiments of the present invention, the order of the steps can be adjusted according to the adjustment of the process.

[0050] In the present invention, the term "extending outward" refers to extending in a direction away from the controller cover (or the combination of the controller cover and the controller housing), and the extension direction may be, for example, perpendicular or parallel to the peripheral interface of the controller cover or at a certain angle thereto.

[0051] Figure 1 A schematic structural diagram of a natural gas sampling device for detection and analysis according to an embodiment of the utility model is shown.

[0052] like Figure 1 As shown, a natural gas sampling device for detection and analysis includes a storage sampling bottle, an inlet pressure reducing valve 20, an outlet pressure reducing valve 30, a sample inlet tube 21, a sample outlet tube 22, a constant pressure valve 40, a first heating component and a second heating component.

[0053] The storage sampling bottle comprises a storage liner 11, a buffer liner 12, an outer heat-insulating layer 13, a first heating chamber, and a second heating chamber.

[0054] The inlet of the storage liner 11 is connected to the sample injection tube 21, and the inlet pressure reducing valve 20 is arranged on the sample injection tube 21. The storage liner 11 and the buffer liner 12 are made of 316L stainless steel and are passivated to prevent corrosion by sulfur plasma. If the liner is corroded, the material of the liner will be mixed into the natural gas, affecting the detection results. The pressure that the storage liner 11 can withstand is 0-20MPa. The storage liner 11 and the buffer liner 12 can withstand higher temperatures, such as 250°C.

[0055] A constant pressure valve 40 is arranged between the storage liner 11 and the buffer liner 12. The constant pressure valve 40 is used to gradually reduce the pressure of the high-pressure gas in the storage liner 11 to the required pressure (0.01-0.5 MPa, which can be selected within this range according to the detection situation) and transport it to the buffer liner 12. During the detection process, the constant pressure valve 40 is always in an open state. When the gas in the buffer liner 12 is reduced, it will automatically be replenished through the constant pressure valve to ensure that the pressure of the buffer bottle is constant.

[0056] The sample outlet pipe 22 is connected to the outlet of the buffer liner 12, and the outlet pressure reducing valve 30 is arranged on the sample outlet pipe 22. The gas to be detected in the buffer liner 12 is delivered to the instrument through the outlet pressure reducing valve 30. The gas passes through the constant pressure valve 40 and the outlet pressure reducing valve 30 in sequence, with double insurance, to obtain a more stable gas source, and ensure the stability of the gas pressure entering the detection instrument.

[0057] The outer heat-insulating layer is a double-layer structure 13, and the inner layer is vacuum, so as to prevent scalding. The inner wall of the outer heat-insulating layer 13 is provided with a plurality of fixing parts 14 made of insulating materials.

[0058] The outer insulation layer 13 accommodates the storage liner 11 and the buffer liner 12 , and there is a gap between the outer insulation layer 13 and the storage liner 11 and the buffer liner 12 , and the inner wall of the outer insulation layer 13 and the outer wall of the storage liner 11 and the buffer liner 12 form a sandwich.

[0059] The first heating chamber is located between the storage liner 11 and the outer heat-insulating layer 13. The second heating chamber is located between the buffer liner 12 and the outer heat-insulating layer 13.

[0060] The partition 15 is disposed between the outer insulation layer 13 and the storage liner 11, connecting the inner wall of the outer insulation layer 13 and the side wall of the storage liner 11, and the two partitions 15 are respectively adjacent to the two ends of the storage liner 11, for example, the partition 15 is 2-10 cm away from the end of the storage liner 11. The two partitions 15 surround the storage liner 11. Similarly, a partition 15 is also disposed between the outer insulation layer 13 and the buffer liner 12. The two partitions 15, the outer insulation layer 13 and the storage liner 11 form a first heating chamber, and the partition 15, the outer insulation layer 13 and the buffer liner 12 form a second heating chamber, and the two partitions 15 are respectively adjacent to the two ends of the buffer liner 12. The first heating chamber and the second heating chamber contain a heat transfer medium to heat the natural gas in the storage liner. The heat transfer medium may be, for example, heat transfer oil.

[0061] Valves are connected to both ends of the storage liner 11 and the buffer liner 12. The partitions are arranged adjacent to both ends of the storage liner. The heating chamber does not contact the valve to avoid overheating and burning of the valve during the heating process.

[0062] The first heating component and the second heating component can be used to heat the heat-conducting medium in the heating chambers of the storage liner 11 and the buffer liner 12, wherein the first heating component is used for rapid heating and the second heating component is used for heat preservation.

[0063] The first heating assembly includes a first power interface 51 and a first heating wire 52 for rapid heating. The second heating assembly includes a second power interface 53 and a second heating wire 54 for heat preservation. The first heating wire 51 and the second heating wire 53 are immersed in the heat transfer oil to heat the heat transfer oil to heat the storage tank for heating and heat preservation.

[0064] The two first heating wires 52 are spirally wrapped around the storage liner 11 and the buffer liner 12, fixed by the fixing component 14, and immersed in the heat-conducting medium. The two first heating wires 52 are connected to the first power interface 51 for rapid heating. Similarly, the two second heating wires 54 are spirally wrapped around the storage liner 11 and the buffer liner 12, fixed by the fixing component 14, and immersed in the heat-conducting medium. The two second heating wires 54 are connected to the second power interface 53 for heat preservation. The first heating wire 52 and the second heating wire 54 do not contact each other. A mounting hole is provided on some partitions, and one end of the first heating wire 52 and the second heating wire 54 is fixed in the mounting hole of the partition. A seal is provided in the mounting hole to prevent leakage of heat-conducting oil. The seal is made of insulating material.

[0065] The first power interface 51 and the second power interface 53 are arranged on the outer insulation layer 13, wherein the first power interface 51 is connected to the first heating wire 52 through a conductive line, and the second power interface 53 is connected to the second heating wire 54 through a conductive line. The first power interface 51 is used to connect to a 220V power supply, and the second power interface 53 is a USB interface, which is used to connect to a 5V power supply with low heating power. The first power interface 51 and the second power interface 53 are both provided with switches to control power off and on. And the first power interface 51 and the second power interface 53 can automatically power off and on when receiving a temperature signal.

[0066] The sampling device is also provided with a first temperature detector 61 and a second temperature detector 62, which are used to detect and display the temperature of the natural gas in the storage tank and the buffer tank, respectively. The first temperature detector 61 and the second temperature detector 62 are both connected to the first power interface 51 and the second power interface 53 for signal connection.

[0067] The first heating chamber and the second heating chamber are provided with double-group heating wires, which are quickly heated to the required temperature through the first heating component to preheat the gas in the bottle. When the first temperature detector and the second temperature detector detect that the temperature reaches the highest value in the set temperature range, a signal is sent to the corresponding first power interface 51, the first power interface is powered off, and the first heating wire automatically stops heating. The operator sees that the first temperature detector 61 and the second temperature detector 62 show that the temperature has reached the highest value, and disconnects the first power interface 51 from the power supply. Then the second power interface 53 is connected to the power supply for insulation and maintained within the set temperature range. Generally, the temperature difference between the highest temperature and the lowest temperature is about 2°C. Once the temperature drops below the set range, the second heating wire will work, and stop when the temperature rises to the highest temperature.

[0068] The sampling device is also provided with a first pressure gauge 71 and a second pressure gauge 72, which are used to detect the gas pressure in the storage liner and the buffer liner respectively.

[0069] The sampling device is also provided with an outlet pressure gauge 73, which is arranged on the sample outlet pipe 22 and is used to detect the pressure of the natural gas entering the detection instrument. If the outlet pressure gauge 73 shows that the gas pressure is greater than the detection pressure, the outlet pressure reducing valve 30 is used to adjust.

[0070] The sampling device is also provided with a handle, which is fixed to the bottle body of the storage sampling bottle and is used to move the sampling device.

[0071] The use process of the above sampling device is as follows:

[0072] After natural gas is extracted, it is transported by natural gas pipelines. Sampling points are set on the pipelines to collect natural gas and send it to the laboratory for analysis of its composition. The temperature of natural gas in the pipeline is generally the ambient temperature, such as 10.8 to 24.0°C, and the pressure in the pipeline is 1.5 to 8.0 MPa.

[0073] During sampling, the inlet pressure reducing valve 20, the outlet pressure reducing valve 30, and the constant pressure valve 40 are opened, and the sampling tube 21 is connected to the sampling point on the natural gas pipeline. Since the pressure in the pipeline is greater than the atmospheric pressure, the natural gas is poured into the storage liner 11 and the buffer liner 12. After the storage liner 11 and the buffer liner 12 are filled according to the first pressure gauge 71 and the second pressure gauge 72, the inlet pressure reducing valve 20 is closed, and the outlet pressure reducing valve 30 and the constant pressure valve 40 remain open to discharge the gas in the two liner, and the discharge state is judged according to the first pressure gauge 71 and the second pressure gauge 72. Then, the gas is replaced by filling the natural gas once and then discharging it. After the natural gas is discharged this time, the outlet pressure reducing valve 30 is closed. When the natural gas is poured for the third time, the outlet pressure reducing valve 30 is closed. After the storage liner 11 and the buffer liner 12 are filled, the inlet pressure reducing valve 20 is closed, and the natural gas collected this time is used as the test sample. When sampling, the replacement is performed multiple times, for example, 2 times, 3 times or 4 times, to ensure the accuracy of sampling in the sampling bottle.

[0074] Before testing and analysis, the natural gas needs to be quickly heated to the temperature required for testing (60-100℃). Usually, a smaller temperature range needs to be selected from 60-100℃ as the testing temperature, such as 65℃±2℃, 70℃±2℃, 75℃±2℃; usually 70℃±2℃.

[0075] The first power interface 51 is connected to a power source, and the natural gas in the storage liner 11 and the buffer liner 12 is quickly heated to the highest temperature in the set temperature range. When the first temperature detector 61 and the second temperature detector 62 detect that the temperature reaches the highest value in the set temperature range, a signal is sent to the corresponding first power interface 51, and the first power interface is powered off, and the first heating wire automatically stops heating. The operator disconnects the first power interface 51 from the power source according to the temperature displayed by the first temperature detector 61 and the second temperature detector 62. Then the second power interface 53 is connected to power to keep the temperature within the set temperature range.

[0076] The pressure in the storage liner 11 is generally between 1.5 and 8.0 MPa, and needs to be further reduced to the detection pressure (0.01 to 0.5 MPa) required for detection. The natural gas in the storage liner 11 enters the buffer liner 12 after being reduced in pressure by the constant pressure valve 40. Generally, a pressure value between 0.01 and 0.5 MPa is selected as the stable pressure value in the buffer liner according to actual conditions. During the detection process, when the natural gas in the buffer liner 12 decreases, the constant pressure valve automatically replenishes natural gas to the buffer liner 12 to keep the pressure in the buffer liner 12 stable.

[0077] Connect the sample outlet pipe 22 to the gas chromatograph, open the outlet pressure reducing valve 30, and the natural gas enters the gas chromatograph for detection. During the detection process, when the gas in the buffer tank decreases, it will automatically be replenished through the constant pressure valve 40 to ensure that the pressure in the buffer tank is constant. When it is transported to the instrument through the pressure reducing valve at the outlet, it can play a double insurance and a more stable gas source.

[0078] Although some embodiments of the present invention have been described in this application document, it will be understood by those skilled in the art that these embodiments are only shown as examples. Under the guidance of the present invention, those skilled in the art can think of numerous variations, alternatives and improvements without exceeding the scope of the present invention. The attached claims are intended to define the scope of the present invention and thereby cover methods and structures within the scope of these claims themselves and their equivalents.

Claims

1. A natural gas sampling device for detection and analysis, characterized in that: include: Storage sampling bottles, which include: An outer insulation layer, which accommodates a storage liner and a buffer liner; a storage tank configured to store collected natural gas; a buffer liner configured to store depressurized natural gas; A first heating chamber, which is located between the storage liner and the outer insulation layer and contains a heat-conducting medium; and A second heating chamber, which is located between the buffer liner and the outer insulation layer and contains a heat-conducting medium; A constant pressure valve, which is disposed between the storage liner and the buffer liner and is configured to reduce the pressure of the natural gas in the storage liner and release it into the buffer liner, and maintain the pressure in the buffer liner at a set value; a first heating assembly configured to heat the heat transfer medium in the first heating chamber and the second heating chamber to heat the natural gas in the storage liner and the buffer liner; and The second heating component is configured to keep the heated natural gas in the storage liner and the buffer liner warm.

2. The device according to claim 1, characterized in that There is a gap between the storage liner and the outer insulation layer; There is a gap between the buffer liner and the outer insulation layer; A plurality of partitions are arranged between the storage liner and the outer insulation layer and between the buffer liner and the outer insulation layer, wherein the partitions, the storage liner and the outer insulation layer constitute the first heating chamber, and the partitions, the buffer liner and the outer insulation layer constitute the second heating chamber.

3. The device according to claim 2, characterized in that The partition connects the inner wall of the outer insulation layer and the side wall of the storage liner, and the partition is adjacent to both ends of the storage liner; The partition connects the inner wall of the outer heat-insulating layer and the side wall of the buffer liner, and the partition is adjacent to two ends of the buffer liner.

4. The device according to claim 2, characterized in that The first heating component comprises: A first power interface, which is arranged on the outer insulation layer and is used for connecting to an external power source; A first heating wire, connected to the first power interface and located in the first heating chamber and the second heating chamber; The second heating assembly comprises: A second power interface, which is arranged on the outer insulation layer and is used for connecting to an external power source; The second heating wire is connected to the second power interface and is located in the first heating cavity and the second heating cavity.

5. The device according to claim 4, characterized in that The first power interface and the second power interface are both provided with switches to control power on and off.

6. The device according to claim 5, characterized in that Also includes: A first temperature detector, which is used to detect the temperature in the storage tank and is signal-connected to the first power interface and the second power interface; The second temperature detector is used to detect the temperature in the buffer liner and is connected to the first power interface and the second power interface by signal.

7. The device according to claim 4, characterized in that A plurality of fixing components made of insulating materials are arranged on the inner wall of the outer thermal insulation layer.

8. The device according to claim 7, characterized in that A plurality of the first heating wires and the second heating wires are spirally wound around the storage liner and the buffer liner, fixed by the fixing component, and immersed in the heat-conducting medium, wherein the first heating wires and the second heating wires do not contact each other.

9. The device according to claim 4, characterized in that A mounting hole is provided on part of the partitions, and one end of the first heating wire and the second heating wire is fixed in the mounting hole; A sealing member is arranged in the mounting hole.

10. The device according to any one of claims 1 to 9, characterized in that: Also includes: A sample inlet tube connected to the inlet of the storage liner; An inlet pressure reducing valve, which is arranged on the sample inlet tube; A sample outlet tube connected to the outlet of the buffer liner; An outlet pressure reducing valve, which is arranged on the sample outlet pipe; A first pressure gauge, which is used to detect the gas pressure in the storage tank; A second pressure gauge, which is used to detect the gas pressure in the buffer liner; The outlet pressure gauge is arranged on the sample outlet pipe and is used to detect the pressure of the natural gas entering the detection instrument.

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