Full-size PE pipeline hydrogen permeation and aging test integrated equipment

Abstract

A full-size PE pipeline hydrogen permeation and aging test integrated device disclosed by the present invention comprises a high-temperature aging oven, supporting plates are fixedly installed at the two ends of the bottom of an inner cavity of the high-temperature aging oven, sealing mechanisms for testing are arranged at the tops of the supporting plates, and PE pipe bodies are arranged on the inner side walls of the sealing mechanisms; through cooperative arrangement of the high-temperature aging oven, the sealing mechanism, the air intake and exhaust mechanism, the pressure reading instrument and the gas chromatograph, the hydrogen permeability of the full-size PE pipeline can be tested, and meanwhile, an aging test can be carried out in a hydrogen environment, so that the test effect is improved, and the test cost is reduced. The device has the advantage that the hydrogen permeability coefficient of hydrogen-doped natural gas in the PE pipeline can be measured through a gas chromatograph, so that the requirements of scientific research and engineering application are met, the sealing operation during testing is realized by utilizing the sealing mechanism, and the air intake and exhaust mechanism is used for realizing the air intake and exhaust operation during testing; and the pressure reading instrument and the gas chromatograph are used for analyzing and recording the obtained data.

Description

Technical Field

[0001] The present invention relates to the technical field of PE pipeline testing, and particularly relates to an integrated device for full-size PE pipeline hydrogen permeation and aging testing. Background Art

[0002] With the proposed goal, there is an urgent need to adopt clean energy to replace traditional fossil energy and reduce carbon emissions;

[0003] Hydrogen is a clean energy source with zero carbon emissions after combustion. Vigorously promoting the use of hydrogen energy is conducive to reducing carbon emissions. Transporting hydrogen and hydrogen-enriched natural gas through urban gas non-metallic PE pipelines is an important way to achieve large-scale utilization of hydrogen energy, which helps to reduce the use of natural gas and thus reduce carbon emissions. However, due to the small volume of hydrogen molecules and the characteristics of PE pipeline materials, hydrogen is prone to permeate in PE pipelines. Excessive hydrogen permeation is likely to cause energy loss and waste, and hydrogen accumulation may also occur in enclosed spaces, leading to risks such as combustion and explosion. In addition, PE pipelines are also prone to aging and failure, and when in contact with hydrogen, it may also affect the aging performance of PE pipelines. Therefore, it is necessary to consider the permeation of hydrogen in PE pipelines and the aging performance of PE pipelines in a hydrogen-containing environment.

[0004] Existing technologies can only test the permeability of pure gases in non-metallic pipelines, cannot test the permeability of single-component gases in mixed gases in non-metallic pipelines, and ignore the aging performance of non-metallic pipelines in a hydrogen-containing environment. Summary of the Invention

[0005] The purpose of the present invention is to provide an integrated device for full-size PE pipeline hydrogen permeation and aging testing, which has the advantage of being able to measure the hydrogen permeation coefficient of hydrogen-enriched natural gas in a PE pipeline through a gas chromatograph. While testing the hydrogen permeation performance of a full-size PE pipeline, it can also work at high temperature for a long time to study the aging performance of PE pipelines in a hydrogen-containing environment, so as to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An integrated device for full-size PE pipeline hydrogen permeation and aging testing, including a high-temperature aging chamber:

[0007] Both ends of the bottom of the inner cavity of the high-temperature aging chamber are fixedly installed with support plates. A sealing mechanism for testing is arranged on the top of the support plates. The inner side wall of the sealing mechanism is provided with a PE pipe body. Both ends of the PE pipe body are provided with an air inlet and outlet mechanism for preventing leakage. An auxiliary component for data analysis and recording is arranged on the top of the high-temperature aging chamber. A net plate is fixedly installed on the inner side wall of the high-temperature aging chamber;

[0008] The sealing mechanism includes a support component, an adaptation component, and a connection component. The support component is disposed outside the PE pipe body. The adaptation component is disposed on the inner sidewall of the support component. The connection component is disposed at the outer end of the adaptation component.

[0009] The air inlet and exhaust mechanism includes an exhaust component, an air inlet component, a first conveying component, and a second conveying component. The exhaust component is disposed at one end of the PE pipe body. The air inlet component is disposed at the other end of the exhaust component. The first conveying component is disposed at one end of the air inlet component. The second conveying component is disposed at the other end of the air inlet component.

[0010] Exemplarily, the support component includes a fixing ring and a sleeve. The sleeve is sleeved outside the PE pipe body. Two fixing rings are fixedly installed on the outer side of the sleeve. Flange plates are also fixedly installed at both ends of the outer side of the sleeve.

[0011] Exemplarily, the adaptation component includes a connection seat. The connection seats are respectively fixedly installed at both ends of the inner sidewall of the sleeve. A first sealing ring is embedded in the inner sidewall of the connection seat.

[0012] Exemplarily, the connection component includes a connection ring. The connection ring is bolted to the outer side of the flange plate. A second sealing ring is fixedly installed on the inner side of the connection ring.

[0013] Exemplarily, the exhaust component includes a first plug. The first plug is bolted to one end of the PE pipe body. One end of the first plug is penetrated and communicated with a first connecting pipe. One end of the first connecting pipe is communicated with a fourth valve.

[0014] Exemplarily, the air inlet component includes a second plug. The second plug is bolted to the other end of the PE pipe body. One end of the second plug is penetrated and communicated with a second connecting pipe. A pressure gauge is fixedly installed at the top of the second connecting pipe. A third valve is fixedly installed at one end of the second connecting pipe. One end of the third valve is communicated with a three-way pipe.

[0015] Exemplarily, the first conveying component includes a first air inlet pipe. The first air inlet pipe is communicated with one end of the three-way pipe. A first valve is fixedly installed at the top of the first air inlet pipe.

[0016] Exemplarily, the second conveying component includes a second air inlet pipe. The second air inlet pipe is communicated with the other end of the three-way pipe. A second valve is fixedly installed at the top of the second air inlet pipe.

[0017] Exemplarily, a vacuum pump is fixedly installed at the bottom of the high-temperature aging chamber. The air inlet end of the vacuum pump is communicated with the bottom of the PE pipe body through a pipeline.

[0018] Exemplarily, the auxiliary assembly includes a pressure reader and a gas chromatograph. Both the pressure reader and the gas chromatograph are fixedly installed on the top of the high-temperature aging oven, and the detection ends of the pressure reader and the gas chromatograph are both communicated with the top of the inner cavity of the PE pipe body.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] Through the cooperative setting of the high-temperature aging oven, the sealing mechanism, the air inlet and exhaust mechanism, the pressure reader and the gas chromatograph, the present invention can test the hydrogen permeation performance of full-size PE pipes, and can also perform aging tests in a hydrogen-containing environment, thereby improving the test effect. It has the advantage of being able to measure the hydrogen permeation coefficient of hydrogen-doped natural gas in PE pipes through a gas chromatograph to meet the needs of scientific research and engineering applications. The sealing mechanism is used to achieve the sealing operation during the test, while the air inlet and exhaust mechanism is used to achieve the air inlet and exhaust operations during the test. The pressure reader and the gas chromatograph are used to analyze and record the obtained data.

[0021] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures pointed out in the specification and the drawings. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the present invention;

[0023] Figure 2 It is a schematic internal structure diagram of the high-temperature aging oven of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the support plate of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the pressure reader of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the first plugging structure of the present invention;

[0027] Figure 6 It is a schematic structural diagram of the second sealing ring of the present invention.

[0028] In the figure: 1. High-temperature aging box; 2. Support plate; 3. Mesh plate; 4. PE pipe body; 5. Sealing mechanism; 51. Fixed ring; 52. Sleeve; 53. Connecting seat; 54. First sealing ring; 55. Connecting ring; 56. Second sealing ring; 57. Flange; 6. Air inlet and exhaust mechanism; 61. Vacuum pump; 62. First plug; 63. First connecting pipe; 64. Fourth valve; 65. Second plug; 66. Second connecting pipe; 67. Pressure gauge; 68. Third valve; 69. Three-way pipe; 610. First air inlet pipe; 611. First valve; 612. Second air inlet pipe; 613. Second valve; 7. Pressure reading instrument; 8. Gas chromatograph. Detailed implementation mode

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1-6 shown, the present invention provides an integrated device for hydrogen permeation and aging testing of full-size PE pipes, including a high-temperature aging box 1. Both ends of the inner cavity bottom of the high-temperature aging box 1 are fixedly installed with support plates 2. A sealing mechanism 5 for testing is arranged on the top of the support plates 2. A PE pipe body 4 is arranged on the inner side wall of the sealing mechanism 5. Air inlet and exhaust mechanisms 6 for preventing leakage are arranged at both ends of the PE pipe body 4. An auxiliary component for data analysis and recording is arranged on the top of the high-temperature aging box 1. A mesh plate 3 is fixedly installed on the inner side wall of the high-temperature aging box 1.

[0031] The sealing mechanism 5 includes a support component, an adaptation component and a connection component. The support component is arranged on the outer side of the PE pipe body 4. The adaptation component is arranged on the inner side wall of the support component. The connection component is arranged at the outer end of the adaptation component.

[0032] The sealing work of the sleeved sleeve 52 is realized through the support component, the adaptation component and the connection component, avoiding leakage.

[0033] The air inlet and exhaust mechanism 6 includes an exhaust component, an air inlet component, a first conveying component and a second conveying component. The exhaust component is arranged at one end of the PE pipe body 4. The air inlet component is arranged at the other end of the exhaust component. The first conveying component is arranged at one end of the air inlet component. The second conveying component is arranged at the other end of the air inlet component.

[0034] Through the cooperation of the exhaust component, the air inlet component, the first conveying component and the second conveying component, the air intake, exhaust and gas source conveying operations can be realized.

[0035] AsFigure 6 As shown, the support assembly includes a fixing ring 51 and a sleeve 52. The sleeve 52 is sleeved on the outside of the PE pipe body 4. Two fixing rings 51 are fixedly installed on the outside of the sleeve 52. Flange plates 57 are also fixedly installed at both ends of the outside of the sleeve 52, which helps to form a negative pressure space to assist in subsequent testing operations and can support the high-temperature aging box 1 at the same time.

[0036] As Figure 6 shown, the adapter assembly includes a connection seat 53. The connection seats 53 are respectively fixedly installed at both ends of the inner side wall of the sleeve 52. A first sealing ring 54 is embedded in the inner side wall of the connection seat 53, which helps to achieve auxiliary installation and sealing operations.

[0037] As Figure 6 shown, the connection assembly includes a connection ring 55. The connection ring 55 is bolted to the outside of the flange plate 57. A second sealing ring 56 is fixedly installed on the inside of the connection ring 55, which can achieve connection and sealing operations at both ends.

[0038] Directly sleeve the sleeve 52 on the outside of the PE pipe body 4, and then achieve primary sealing through the first sealing ring 54. At this time, sleeve the connection ring 55 together with the second sealing ring 56 on the outside of the PE pipe body 4, and insert the second sealing ring 56 into the inner side wall of the connection seat 53 to achieve secondary sealing. Finally, bolt and fix between the two fitting flange plates 57 to complete the sealing installation operation.

[0039] As Figure 5 shown, the exhaust assembly includes a first plug 62. The first plug 62 is bolted to one end of the PE pipe body 4. One end of the first plug 62 is penetrated and communicated with a first connecting pipe 63. One end of the first connecting pipe 63 is communicated with a fourth valve 64, which helps to achieve end sealing and exhaust operations.

[0040] As Figure 5 shown, the intake assembly includes a second plug 65. The second plug 65 is bolted to the other end of the PE pipe body 4. One end of the second plug 65 is penetrated and communicated with a second connecting pipe 66. A pressure gauge 67 is fixedly installed on the top of the second connecting pipe 66. One end of the second connecting pipe 66 is fixedly installed with a third valve 68. One end of the third valve 68 is communicated with a tee pipe 69, which is convenient for intake and control switch, and can detect its pressure at the same time.

[0041] As Figure 5 shown, the first conveying assembly includes a first intake pipe 610. The first intake pipe 610 is communicated with one end of the tee pipe 69. A first valve 611 is fixedly installed on the top of the first intake pipe 610, which helps to add hydrogen / hydrogen-enriched natural gas.

[0042] As Figure 5As shown, the second conveying component includes a second intake pipe 612. The second intake pipe 612 is connected to the other end of the three-way pipe 69. A second valve 613 is fixedly installed at the top of the second intake pipe 612, facilitating the direct addition of nitrogen.

[0043] As Figure 5 shown, a vacuum pump 61 is fixedly installed at the bottom of the high-temperature aging chamber 1. The intake end of the vacuum pump 61 is connected to the bottom of the PE pipe body 4 through a pipeline. The vacuum pump 61 is mainly used to evacuate the space between the sleeve 52 and the PE pipe body 4 to facilitate its stable operation.

[0044] As Figure 4 shown, the auxiliary component includes a pressure gauge 7 and a gas chromatograph 8. Both the pressure gauge 7 and the gas chromatograph 8 are fixedly installed at the top of the high-temperature aging chamber 1. The detection ends of the pressure gauge 7 and the gas chromatograph 8 are both connected to the top of the inner cavity of the PE pipe body 4. The pressure gauge 7 is mainly used to record the pressure-time curve and the analysis results of the gas chromatograph 8. The gas chromatograph 8 is used to analyze the data. The test operation can be completed based on the combination described above.

[0045] The two ends of the PE pipe body 4 are sealed by forming a fixture with the second plug 65 and the first plug 62. Then, hydrogen / hydrogen-enriched natural gas and nitrogen in the gas source are connected through the second plug 65, the first plug 62, and the corresponding connected pipelines, realizing the functions of ventilating the gas source into the PE pipe body 4 and sealing the inside of the PE pipe body 4 after inflation.

[0046] Around the PE pipe body 4, the PE pipe body 4 is wrapped by a sleeve 52. The part where the sleeve 52 contacts the PE pipe body 4 is sealed to prevent leakage, so that a sealed area is formed between the sleeve 52 and the PE pipe body 4.

[0047] The sealed PE pipe body 4 is placed into the high-temperature aging chamber 1 through the fixture formed by the sleeve 52, the second plug 65, and the first plug 62. The temperature control is realized through the high-temperature aging chamber 1, and the aging operation can be carried out.

[0048] The specific experimental operation steps are as follows:

[0049] 1. Start the high-temperature aging chamber and set the working temperature according to the experimental temperature;

[0050] 2. Close the first valve 611 and open the third valve 68;

[0051] 3. Close the fourth valve 64, open the second valve 613, and fill 0.2 MPa of nitrogen into the PE pipe body 4;

[0052] 4. Close the second valve 613, open the fourth valve 64, and evacuate the mixed gas of nitrogen and air inside the PE pipe body 4;

[0053] 5. Repeat steps 3 and 4 at least 5 times to evacuate the air inside the PE pipe body 4;

[0054] 6. Close the fourth valve 64, open the first valve 611, and fill the PE pipe with hydrogen / hydrogen-enriched natural gas at 0.2 MPa;

[0055] 7. Close the first valve 611, open the fourth valve 64, and evacuate the mixed gas of hydrogen / hydrogen-enriched natural gas and nitrogen inside the PE pipe body 4;

[0056] 8. Repeat steps 6 and 7 at least 5 times to evacuate the nitrogen inside the PE pipe body 4, and close the fourth valve 64;

[0057] 9. Start the vacuum pump 61, and evacuate the sealed area between the PE pipe body 4 and the casing 52 to a vacuum with an absolute pressure ≤ 20 kPa;

[0058] 10. Open the first valve 611, fill the PE pipe with hydrogen / hydrogen-enriched natural gas at the pressure required for the experiment, and close the first valve 611 and the third valve 68;

[0059] 11. Start the pressure gauge 7, and record the pressure change in the sealed area between the PE pipe body 4 and the casing 52 at all times;

[0060] 12. Start the permeation and aging experiment, and the working time is the time required for the experiment;

[0061] 13. After the experiment, according to the pressure-time curve recorded by the pressure gauge 7 and the analysis result of the gas chromatograph 8, the permeation coefficient of hydrogen in the PE pipe body 4 at the experimental temperature and experimental pressure can be obtained. As shown, disassemble the PE pipe body 4, and analyze the mechanical and other properties of the PE pipe body 4 after aging when filled with hydrogen / hydrogen-enriched natural gas inside.

[0062] When disassembling the PE pipe body 4, it is necessary to evacuate the hydrogen / hydrogen-enriched natural gas inside the PE pipe body 4. The steps to evacuate the hydrogen / hydrogen-enriched natural gas inside the PE pipe body 4 are as follows:

[0063] 1. Discharge the hydrogen / hydrogen-enriched natural gas inside the PE pipe body 4;

[0064] 2. Fill the PE pipe body 4 with nitrogen at 0.2 MPa;

[0065] 3. Discharge the mixed gas of nitrogen and hydrogen / hydrogen-enriched natural gas inside the PE pipe body 4;

[0066] 4. Repeat steps 2 and 3 at least 5 times.

[0067] The steps to evacuate the hydrogen / hydrogen-enriched natural gas in the sealed area between the PE pipe body 4 and the casing 52 are as follows:

[0068] 1. Discharge the hydrogen / hydrogen-enriched natural gas in the sealed area;

[0069] 2. Fill the sealed area with nitrogen at 0.2 MPa;

[0070] 3. Discharge the mixed gas of nitrogen and hydrogen / hydrogen-enriched natural gas in the sealed area;

[0071] 4. Vacuum the sealed area to an absolute pressure ≤ 20 kPa;

[0072] 5. Fill the sealed area with nitrogen until the pressure reaches atmospheric pressure.

[0073] After the above steps, it can be ensured that there is no flammable and explosive hydrogen / hydrogen-enriched natural gas inside the PE pipe body 4 and in the sealed area between the PE pipe body 4 and the casing 52. At this time, the PE pipeline can be disassembled.

[0074] In the above formula: Pe is the gas permeability coefficient, with the unit of cm 3 (STP)·cm / (cm 2 ·s·MPa); △P / △t is the pressure change per unit time in the sealed area between the PE pipe body 4 and the casing 52 during the stable permeation stage, in MPa / s; V is the volume of the sealed area between the PE pipe body 4 and the casing 52, with the unit of cm 3 ; T 0 is the temperature under standard conditions of Standard Temperature and Pressure, STP, 273.15 K; D is the thickness of the casing 52, with the unit of cm; A is the inner wall area of the pipeline, with the unit of cm 2 ; P 0 is the pressure under STP, 0.10133 MPa; T is the experimental temperature, in K; P 1 is the pressure inside the PE pipe body 4 at the start of the experiment, with the unit of MPa; P 2 is the pressure in the sealed area between the PE pipe body 4 and the casing 52 at the start of the experiment, with the unit of MPa; Z is the proportion of hydrogen in the sealed area between the PE pipe body 4 and the casing 52 analyzed by the gas chromatograph. For hydrogen, Z is 1, and for hydrogen-enriched natural gas, Z is less than 1.

[0075] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A full-size PE pipeline hydrogen permeation and aging test integrated equipment, characterized in that: It comprises a high temperature aging box (1); Support plates (2) are fixedly mounted at both ends of the bottom of the inner cavity of the high-temperature aging box (1); a sealing mechanism (5) for testing is arranged on the top of the support plate (2); a PE pipe body (4) is arranged on the inner side wall of the sealing mechanism (5); and leak-proof air intake and exhaust mechanisms (6) are arranged at both ends of the PE pipe body (4); an auxiliary component for data analysis and recording is arranged on the top of the high-temperature aging box (1); and a mesh plate (3) is fixedly mounted on the inner side wall of the high-temperature aging box (1); The sealing mechanism (5) comprises a supporting component, an adapting component and a connecting component, wherein the supporting component is arranged on the outside of the PE pipe body (4), the adapting component is arranged on the inner side wall of the supporting component, and the connecting component is arranged on the outer end of the adapting component; The air intake and exhaust mechanism (6) comprises an exhaust component, an air intake component, a first conveying component and a second conveying component. The exhaust component is arranged at one end of the PE pipe body (4), the air intake component is arranged at the other end of the exhaust component, the first conveying component is arranged at one end of the air intake component, and the second conveying component is arranged at the other end of the air intake component.

2. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 1, characterized in that: The support assembly comprises a fixing ring (51) and a sleeve (52), wherein the sleeve (52) is sleeved on the outside of the PE pipe body (4), two sets of fixing rings (51) are fixedly installed on the outside of the sleeve (52), and flanges (57) are also fixedly installed at both ends of the outside of the sleeve (52).

3. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 1, characterized in that: The adapter assembly comprises a connecting seat (53), the connecting seat (53) being fixedly mounted on two ends of the inner wall of the sleeve, respectively, and a first sealing ring (54) being embedded in the inner wall of the connecting seat (53).

4. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 1, characterized in that: The connection assembly comprises a connection ring (55), the connection ring (55) is bolted to the outside of the flange (57), and a second sealing ring (56) is fixedly installed on the inside of the connection ring (55).

5. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 1, characterized in that: The exhaust assembly comprises a first plug (62), wherein the first plug (62) is bolted to one end of the PE pipe body (4), one end of the first plug (62) is connected to a first connecting pipe (63) through-through, and one end of the first connecting pipe (63) is connected to a fourth valve (64).

6. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 5, characterized in that: The air intake assembly comprises a second plug (65), the second plug (65) is bolted to the other end of the PE pipe body (4), one end of the second plug (65) is connected to a second connecting pipe (66) in a through-type manner, a pressure gauge (67) is fixedly installed on the top of the second connecting pipe (66), a third valve (68) is fixedly installed on one end of the second connecting pipe (66), and one end of the third valve (68) is connected to a three-way pipe (69).

7. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 6, characterized in that: The first conveying assembly comprises a first air inlet pipe (610), the first air inlet pipe (610) is connected to one end of the three-way pipe (69), and a first valve (611) is fixedly installed on the top of the first air inlet pipe (610).

8. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 7, characterized in that: The second conveying assembly comprises a second air inlet pipe (612), the second air inlet pipe (612) is connected to the other end of the three-way pipe (69), and a second valve (613) is fixedly installed on the top of the second air inlet pipe (612).

9. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 1, characterized in that: A vacuum pump (61) is fixedly installed at the bottom of the high-temperature aging box (1), and an air inlet end of the vacuum pump (61) is connected to the bottom of the PE pipe body (4) through a pipeline.

10. The full-size PE pipeline hydrogen permeation and aging test integrated equipment according to claim 1, characterized in that: The auxiliary components include a pressure reader (7) and a gas chromatograph (8), the pressure reader (7) and the gas chromatograph (8) are both fixedly installed on the top of the high-temperature aging box (1), and the detection ends of the pressure reader (7) and the gas chromatograph (8) are both connected to the top of the inner cavity of the PE pipe body (4).

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