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

Abstract

The utility model discloses full-size PE pipeline hydrogen permeation and aging test integrated equipment which 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, a sealing mechanism used for testing is arranged at the tops of the supporting plates, and a PE pipe body is arranged on the inner side wall of the sealing mechanism; according to the utility model, the high-temperature aging oven, the sealing mechanism, the air intake and exhaust mechanism, the pressure reading instrument and the gas chromatograph are arranged in a matched manner, so that 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, thereby improving the test effect; the hydrogen permeability coefficient of hydrogen-doped natural gas in a PE pipeline can be measured through gas chromatography, so that the requirements of people are met, sealing operation during testing is achieved through the sealing mechanism, the gas inlet and outlet mechanism is used for achieving gas inlet and outlet operation during testing, and the pressure reading instrument and the gas chromatograph are used for analyzing and recording obtained data.

Description

TECHNICAL FIELD

[0001] The utility model relates to PE pipeline test technical field, concretely relates to a full -size PE pipeline hydrogen permeation and aging test integration equipment. BACKGROUND

[0002] Hydrogen is a clean energy with zero carbon emission after combustion, and vigorously popularizing the use of hydrogen energy is conducive to reducing carbon emission. Through the hydrogen gas and hydrogen-doped natural gas delivered by the non-metallic PE pipeline of town gas, it is an important way to realize large-scale utilization of hydrogen energy, which helps to reduce the utilization of natural gas and thus reduce carbon emission. Then, due to the characteristics of PE pipeline material, hydrogen is easy to permeate in PE pipeline, and excessive hydrogen permeation is easy to cause energy loss and waste, and in a closed space, hydrogen accumulation may also cause combustion explosion and other risks. In addition, PE pipeline is also easy to age and fail, and when in contact with hydrogen, it may also affect the aging performance of PE pipeline, therefore, the hydrogen permeation in PE pipeline needs to be considered, and the aging performance of PE pipeline in the hydrogen environment needs to be considered

[0003] The existing technology can only test the permeability of pure gas in non-metallic pipeline, cannot test the permeability of single component gas in non-metallic pipeline, and ignores the aging performance of non-metallic pipeline in the hydrogen environment. INVENTION CONTENTS

[0004] The utility model discloses a full -size PE pipeline hydrogen permeation and aging test integration equipment, which can measure the hydrogen permeation coefficient of hydrogen-doped natural gas in PE pipeline through gas chromatography, has the advantages of long -time high -temperature work, researches the aging performance of PE pipeline in the hydrogen environment, can test the hydrogen permeation performance of full -size PE pipeline, and can test the aging of PE pipeline in the hydrogen environment, thereby solving the problems in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: a full -size PE pipeline hydrogen permeation and aging test integration equipment, including high -temperature aging box:

[0006] Both ends of the bottom of the high -temperature aging box inner chamber are fixedly installed with the support board, the top of the support board is provided with the sealing mechanism for testing, the inner side wall of the sealing mechanism is provided with the PE pipe body, the both ends of the PE pipe body are provided with the air -leakage -proof air inlet and exhaust machine, the top of the high -temperature aging box is provided with the auxiliary assembly for data analysis record, the inner side wall of the high -temperature aging box is fixedly installed with the mesh plate;

[0007] The sealing mechanism comprises a supporting assembly, an adapting assembly and a connecting assembly, the supporting assembly is arranged on the outer side of the PE pipe body, the adapting assembly is arranged on the inner side wall of the supporting assembly, and the connecting assembly is arranged on the outer end of the adapting assembly.

[0008] The air inlet and exhaust mechanism comprises an exhaust assembly, an air inlet assembly, a first conveying assembly and a second conveying assembly, the exhaust assembly is arranged on one end of the PE pipe body, the air inlet assembly is arranged on the other end of the exhaust assembly, the first conveying assembly is arranged on one end of the air inlet assembly, and the second conveying assembly is arranged on the other end of the air inlet assembly.

[0009] The supporting assembly comprises a fixed ring and a sleeve, the sleeve is sleeved on the outer side of the PE pipe body, two groups of fixed rings are fixedly installed on the outer side of the sleeve, and flanges are also fixedly installed on the two ends of the outer side of the sleeve.

[0010] The auxiliary assembly comprises a pressure reading instrument and a gas chromatograph, the pressure reading instrument and the gas chromatograph are both fixedly installed on the top of the high-temperature aging box, and the detection ends of the pressure reading instrument and the gas chromatograph are both communicated with the top of the inner cavity of the PE pipe body.

[0011] Illustratively, the adapting assembly comprises a connecting seat, the connecting seat is fixedly installed on the two ends of the inner side wall of the sleeve, and a first sealing ring is embedded in the inner side wall of the connecting seat.

[0012] Illustratively, the connecting assembly comprises a connecting ring, the connecting ring is bolted on the outer side of the flange, and a second sealing ring is fixedly installed on the inner side of the connecting ring.

[0013] Illustratively, the exhaust assembly comprises a first plugging, the first plugging is bolted on one end of the PE pipe body, a first connecting pipe is in through communication with one end of the first plugging, and a fourth valve is communicated with one end of the first connecting pipe.

[0014] Illustratively, the air inlet assembly comprises a second plugging, the second plugging is bolted on the other end of the PE pipe body, a second connecting pipe is in through communication with one end of the second plugging, a pressure gauge is fixedly installed on the top of the second connecting pipe, a third valve is fixedly installed on one end of the second connecting pipe, and a tee pipe is communicated with one end of the third valve.

[0015] Illustratively, the first conveying assembly comprises a first air inlet pipe, the first air inlet pipe is communicated with one end of the tee pipe, and a first valve is fixedly installed on the top of the first air inlet pipe.

[0016] Illustratively, the second conveying assembly comprises a second air inlet pipe, the second air inlet pipe is communicated with the other end of the tee pipe, and a second valve is fixedly installed on the top of the second air inlet pipe.

[0017] The high-temperature aging box is provided with a vacuum pump machine fixedly installed at the bottom.

[0018] Compared with the prior art, the high-temperature aging box has the advantages that:

[0019] The high-temperature aging box, the sealing mechanism, the air inlet and outlet mechanism, the pressure reading instrument and the gas chromatograph are cooperatively arranged, so that the hydrogen permeation performance of the full-size PE pipeline can be tested, and aging test can be simultaneously performed in a hydrogen environment, thereby improving the test effect, and the hydrogen permeation coefficient of hydrogen-doped natural gas in the PE pipeline can be measured by the gas chromatograph, to meet the needs of people.

[0020] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the present application;

[0022] Figure 2 It is an internal structural schematic view of the high-temperature aging box of the present application;

[0023] Figure 3 It is a structural schematic view of the present application;

[0024] Figure 4 It is a structural schematic view of the pressure reading instrument of the present application;

[0025] Figure 5 It is a structural schematic view of the first sealing structure of the present application;

[0026] Figure 6 It is a structural schematic view of the second sealing ring of the present application.

[0027] In the diagram: 1. High-temperature aging chamber; 2. Support plate; 3. Mesh plate; 4. PE pipe body; 5. Sealing mechanism; 51. Fixing ring; 52. Sleeve; 53. Connecting seat; 54. First sealing ring; 55. Connecting ring; 56. Second sealing ring; 57. Flange; 6. Inlet and outlet 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. T-connector; 610. First inlet pipe; 611. First valve; 612. Second inlet pipe; 613. Second valve; 7. Pressure reader; 8. Gas chromatograph. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figures 1-6 As shown, this utility model provides an integrated device for hydrogen permeation and aging testing of full-size PE pipes, including a high-temperature aging chamber 1. Support plates 2 are fixedly installed at both ends of the bottom of the inner cavity of the high-temperature aging chamber 1. A sealing mechanism 5 for testing is provided on the top of the support plate 2. A PE pipe body 4 is provided on the inner side wall of the sealing mechanism 5. Leakage-proof air inlet and outlet mechanisms 6 are provided at both ends of the PE pipe body 4. An auxiliary component for data analysis and recording is provided on the top of the high-temperature aging chamber 1. A mesh plate 3 is fixedly installed on the inner side wall of the high-temperature aging chamber 1.

[0030] The sealing mechanism 5 includes a support component, an adapter component, and a connecting component. The support component is located on the outside of the PE pipe body 4, the adapter component is located on the inner side wall of the support component, and the connecting component is located at the outer end of the adapter component.

[0031] The sleeve 52 is sealed by the support component, the adapter component and the connecting component to prevent leakage.

[0032] The intake and exhaust mechanism 6 includes an exhaust component, an intake component, a first conveying component, and a second conveying component. The exhaust component is located at one end of the PE pipe body 4, the intake component is located at the other end of the exhaust component, the first conveying component is located at one end of the intake component, and the second conveying component is located at the other end of the intake component.

[0033] The intake assembly, the first conveying assembly, and the second conveying assembly work together to achieve intake, exhaust, and air supply delivery.

[0034] As shown in Figure 6 The support assembly includes a fixed ring 51 and a sleeve 52, the sleeve 52 is sleeved on the outside of the PE pipe body 4, two groups of fixed 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, which can form a negative pressure space to assist subsequent testing operations, and can support the high temperature aging box 1.

[0035] As shown in Figure 6 The adapter assembly includes a connecting seat 53, the connecting seat 53 is fixedly installed at both ends of the inner side wall of the sleeve 52, and the inner side wall of the connecting seat 53 is embedded with a first sealing ring 54, which is beneficial to auxiliary installation and sealing operation.

[0036] As shown in Figure 6 The connecting assembly includes a connecting ring 55, the connecting ring 55 is bolted on the outside of the flange 57, and the inner side of the connecting ring 55 is fixedly installed with a second sealing ring 56, which can be connected and sealed at both ends.

[0037] Directly sleeve the sleeve 52 on the outside of the PE pipe body 4, then realize primary sealing through the first sealing ring 54, at this time sleeve the connecting ring 55 with the second sealing ring 56 on the outside of the PE pipe body 4, and make the second sealing ring 56 inserted into the inner side wall of the connecting seat 53 to realize secondary sealing, and finally the bolted fixing between the two groups of flanges 57 can complete the sealing installation operation.

[0038] As shown in Figure 5 The exhaust assembly includes a first plug 62, the first plug 62 is bolted on one end of the PE pipe body 4, one end of the first plug 62 is through-communicated with a first connecting pipe 63, one end of the first connecting pipe 63 is communicated with a fourth valve 64, which is beneficial to realize end sealing and exhaust operation.

[0039] As shown in Figure 5 The air inlet assembly includes a second plug 65, the second plug 65 is bolted on the other end of the PE pipe body 4, one end of the second plug 65 is through-communicated with a second connecting pipe 66, the top of the second connecting pipe 66 is fixedly installed with a pressure gauge 67, 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 air inlet and control switch, and can detect the pressure.

[0040] As shown in Figure 5 The first conveying assembly includes a first air inlet pipe 610, the first air inlet pipe 610 is communicated at one end of the tee pipe 69, and the top of the first air inlet pipe 610 is fixedly installed with a first valve 611, which is beneficial to the addition of hydrogen and hydrogen-doped natural gas.

[0041] As shown in Figure 5As shown, the second conveying assembly includes a second air inlet pipe 612 which is communicated at the other end of the three-way pipe 69, and a second valve 613 is fixedly installed at the top of the second air inlet pipe 612, facilitating the direct addition of nitrogen.

[0042] As shown in the drawings, Figure 5 As shown, the bottom of the high-temperature aging box 1 is fixedly installed with a vacuum pump 61, the air inlet end of the vacuum pump 61 is communicated with the bottom of the PE pipe body 4 through a pipeline, and the vacuum pump 61 is mainly used to evacuate the space between the sleeve 52 and the PE pipe body 4, so as to facilitate its stable operation.

[0043] As shown in the drawings, Figure 4 As shown, the auxiliary assembly includes a pressure reading instrument 7 and a gas chromatograph 8, both of which are fixedly installed at the top of the high-temperature aging box 1, and the detection ends of the pressure reading instrument 7 and the gas chromatograph 8 are both communicated at the top of the inner cavity of the PE pipe body 4. The pressure reading instrument 7 is mainly used to record the pressure-time curve and the analysis results of the gas chromatograph 8, and the gas chromatograph 8 is used for data analysis work. Based on the above and the following, the test work can be completed.

[0044] The PE pipe body 4 is sealed by the clamp formed by the second block 65 and the first block 62, and then the hydrogen, hydrogen-doped natural gas and nitrogen in the gas source are connected through the second block 65 and the first block 62 and the corresponding pipelines connected thereto, realizing the functions of air supply to the inside of the PE pipe body 4 and sealing after the inside of the PE pipe body 4 is inflated.

[0045] On the periphery of the PE pipe body 4, the PE pipe body 4 is covered by the sleeve 52, and the contact part between the sleeve 52 and the PE pipe body 4 is prevented from leaking in a sealed manner, so that a sealed area is formed between the sleeve 52 and the PE pipe body 4.

[0046] The sealed PE pipe body 4 is placed in the high-temperature aging box 1 by the clamp formed by the sleeve 52 and the second block 65 and the first block 62, and the temperature control is realized by the high-temperature aging box 1, and the aging work can be performed.

[0047] The specific experimental operation steps are as follows:

[0048] 1. Start the high-temperature aging box and set the working temperature according to the experimental temperature;

[0049] 2. Close the first valve 611 and open the third valve 68;

[0050] 3. Close the fourth valve 64, open the second valve 613, and fill 0.2 MPa of nitrogen into the PE pipe body 4;

[0051] 4. Close the second valve 613, open the fourth valve 64, and evacuate the mixed gas of nitrogen and air in the PE pipe body 4.

[0052] 5. Repeat steps 3 and 4 at least 5 times to evacuate the air inside the PE pipe body 4;

[0053] 6. Close the fourth valve 64 and open the first valve 611 to fill the PE pipe with 0.2 MPa hydrogen and hydrogen-doped natural gas;

[0054] 7. Close the first valve 611 and open the fourth valve 64 to evacuate the hydrogen and hydrogen-doped natural gas and nitrogen mixture inside the PE pipe body 4;

[0055] 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;

[0056] 9. Start the vacuum pump 61 to evacuate the sealing area between the PE pipe body 4 and the sleeve 52 to an absolute pressure of ≤20 kPa;

[0057] 10. Open the first valve 611 to fill the PE pipe with hydrogen and hydrogen-doped natural gas at the required experimental pressure, and close the first valve 611 and the third valve 68;

[0058] 11. Start the pressure gauge 7 to record the pressure changes in the sealing area between the PE pipe body 4 and the sleeve 52 at all times;

[0059] 12. Start the permeation and aging experiment, and the working time is the required experimental time;

[0060] 13. After the experiment, the hydrogen permeation coefficient in the PE pipe body 4 at the experimental temperature and pressure can be calculated according to the pressure-time curve recorded by the pressure gauge 7 and the analysis results of the gas chromatograph 8, as shown in the following formula: After the experiment, the PE pipe body 4 is disassembled, and the mechanical and other properties of the PE pipe body 4 after aging when filled with hydrogen and hydrogen-doped natural gas are analyzed.

[0061] In the above formula, Pe is the gas permeation coefficient, with a unit of cm 3 (STP)·cm / (cm 2 ·s·MPa); ΔP / Δt is the pressure change in the sealing area between the PE pipe body 4 and the sleeve 52 per unit time during the stable permeation stage, with a unit of MPa / s; V is the volume of the sealing area between the PE pipe body 4 and the sleeve 52, with a unit of cm 3 ; T0 is the temperature under standard conditions (Standard Temperature and Pressure, STP), 273.15 K; D is the thickness of the sleeve 52, with a unit of cm; and A is the inner wall area of the pipe, with a unit of cm 2; P0 is the pressure under STP, 0.10133 MPa; T is the experimental temperature, K; P1 is the pressure in the PE pipe body 4 at the beginning of the experiment, in MPa; P2 is the pressure in the sealing area between the PE pipe body 4 and the sleeve 52 at the beginning of the experiment, in MPa; Z is the proportion of hydrogen in the sealing area between the PE pipe body 4 and the sleeve 52 analyzed by gas chromatography, for hydrogen, Z is 1, and for hydrogen-doped natural gas, Z is less than 1.

[0062] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A full-size PE pipe hydrogen permeation and aging test integrated device, characterized in that, Including high temperature aging box (1); Both ends of the bottom of the high temperature aging box (1) are fixedly installed with support plates (2), the top of the support plate (2) is provided with a sealing mechanism (5) for testing, the inner side wall of the sealing mechanism (5) is provided with a PE pipe body (4), both ends of the PE pipe body (4) are provided with a leakage-proof air inlet and exhaust mechanism (6), the top of the high temperature aging box (1) is provided with an auxiliary assembly for data analysis and recording, and the inner side wall of the high temperature aging box (1) is fixedly installed with a mesh plate (3). The sealing mechanism (5) comprises a supporting assembly, an adapting assembly and a connecting assembly, the supporting assembly is arranged on the outer side of the PE pipe body (4), the adapting assembly is arranged on the inner side wall of the supporting assembly, and the connecting assembly is arranged on the outer end of the adapting assembly. The air inlet and exhaust mechanism (6) comprises an exhaust assembly, an air inlet assembly, a first conveying assembly and a second conveying assembly, the exhaust assembly is arranged at one end of the PE pipe body (4), the air inlet assembly is arranged at the other end of the exhaust assembly, the first conveying assembly is arranged at one end of the air inlet assembly, and the second conveying assembly is arranged at the other end of the air inlet assembly. The supporting assembly comprises a fixed ring (51) and a sleeve (52), the sleeve (52) is sleeved on the outer side of the PE pipe body (4), two groups of fixed rings (51) are fixedly installed on the outer side of the sleeve (52), and flange plates (57) are also fixedly installed at both ends of the outer side of the sleeve (52). The auxiliary assembly comprises a pressure reading instrument (7) and a gas chromatograph (8), the pressure reading instrument (7) and the gas chromatograph (8) are fixedly installed on the top of the high temperature aging box (1), and the detection ends of the pressure reading instrument (7) and the gas chromatograph (8) are communicated with the top of the inner cavity of the PE pipe body (4).

2. The full-size PE pipe hydrogen permeation and aging test integrated equipment according to claim 1, characterized in that: The adapting assembly comprises a connecting seat (53), the connecting seat (53) is fixedly installed at both ends of the inner side wall of the sleeve, and a first sealing ring (54) is embedded in the inner side wall of the connecting seat (53).

3. The apparatus according to claim 1, wherein: The connecting assembly comprises a connecting ring (55), the connecting ring (55) is bolted on the outer side of the flange plate (57), and a second sealing ring (56) is fixedly installed on the inner side of the connecting ring (55).

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

5. The apparatus according to claim 4, wherein: The air inlet assembly comprises a second block (65), the second block (65) is bolted at the other end of the PE pipe body (4), one end of the second block (65) is through-communication with a second connecting pipe (66), a pressure gauge (67) is fixedly installed at the top of the second connecting pipe (66), one end of the second connecting pipe (66) is fixedly installed with a third valve (68), and one end of the third valve (68) is communicated with a three-way pipe (69).

6. The apparatus according to claim 5, wherein: The first conveying assembly comprises a first air inlet pipe (610) which is communicated at one end of the three-way pipe (69), and a first valve (611) is fixedly installed at the top of the first air inlet pipe (610).

7. The apparatus according to claim 6, wherein: The second conveying assembly comprises a second air inlet pipe (612) which is communicated at the other end of the three-way pipe (69), and a second valve (613) is fixedly installed at the top of the second air inlet pipe (612).

8. The apparatus according to claim 1, wherein: A vacuum pump (61) is fixedly installed at the bottom of the high-temperature aging box (1), and the air inlet end of the vacuum pump (61) is communicated with the bottom of the PE pipe body (4) through a pipeline.

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