Hydrogen embrittlement sensitivity test device for hydrogen-doped natural gas pipeline

Abstract

The utility model belongs to the technical field of natural gas pipeline testing, and discloses a hydrogen embrittlement sensitivity testing device for a hydrogen-doped natural gas pipeline, which comprises a connecting rod, a first propelling plate, a second propelling plate, an air pressure sensor, a testing unit and a pushing unit, the outer side face of the first pushing plate is sleeved with a first sealing ring, the outer side face of the second pushing plate is sleeved with a second sealing ring, and the pushing unit is used for driving the whole device to move relative to the pipeline. The device is small in overall size, is sent into the pipeline during testing, is matched with the inner wall of the pipeline, forms a sealed space between the first propelling plate and the second propelling plate, then starts the air pump to pump air, can judge whether the pipeline leaks or not through reading of the air pressure sensor, and is low in production and transportation cost and high in practicability. The hydrogen embrittlement sensitivity test cost of the natural gas pipeline is effectively saved, so that the problems in the background technology are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of natural gas pipeline testing, and in particular relates to a hydrogen embrittlement sensitivity testing device for a hydrogen-doped natural gas pipeline. Background Art

[0002] The hydrogen embrittlement sensitivity test device for hydrogen-doped natural gas pipelines is a device used to evaluate the hydrogen embrittlement sensitivity of pipeline materials in an environment containing hydrogen, so as to determine whether it is prone to hydrogen embrittlement under conditions containing hydrogen.

[0003] In the prior art, a larger device is usually required to accommodate the entire pipe for hydrogen embrittlement sensitivity test of a natural gas pipeline. For example, a patent document with publication number CN219957171U discloses a "hydrogen embrittlement sensitivity test device for a hydrogen-doped natural gas pipeline". The device requires placing a test pipe on the upper surface of a support plate, and then making the inner surface of the arc plate fit with the outer wall of the test pipe, aligning the connecting plate with the holes on the support plate, and then fixing them with screws. The double-headed motor can be turned on to drive the connecting rod at the output end to rotate, thereby rotating the gear, and the gear drives the toothed plate meshing with it to move downward, so that the support plate is fixed. The support plate moves downward, and the limit block slides along the limit slot. When the limit block moves to the bottom of the limit slot, the test tube is aligned with the air inlet pipe, and the two are connected together by bolts and nuts. Water is injected into the test box, and the gas can be transported to the test tube through the air inlet pipe. By observing the value provided to the display by the pressure tester on the test tube, the pressure that the test tube can withstand is tested. When the test tube cracks and leaks, bubbles will appear. At this time, record the value. In the air inlet pipe, open the exhaust valve first to exhaust, and then reverse the double-head motor to make the support plate separate from the water. After removing the test tube, replace it with a new test tube for testing.

[0004] The device as a whole occupies a large space, this test method requires a larger site, and the device production cost is high, and it is inconvenient to transport and move. Testing of natural gas pipelines requires a large amount of manpower and material resources. Utility Model Content

[0005] The utility model aims to provide a hydrogen embrittlement sensitivity test device for a hydrogen-doped natural gas pipeline. The device is relatively small in size as a whole. During the test, it is sent into the interior of the pipeline and cooperates with the inner wall of the pipeline to form a sealed space between a first propulsion plate and a second propulsion plate. After that, the air pump is started to evacuate air, and the reading of the air pressure sensor can be used to determine whether the pipeline is leaking. The entire experimental process is more convenient, the production and transportation costs of the device are low, and the cost of hydrogen embrittlement sensitivity testing for natural gas pipelines is effectively saved.

[0006] The technical solution adopted by the utility model is a hydrogen embrittlement sensitivity test device for a hydrogen-doped natural gas pipeline, comprising a connecting rod, a first propulsion plate, a second propulsion plate, an air pressure sensor, a test unit and a pushing unit, wherein the first propulsion plate and the second propulsion plate are respectively fixedly mounted on both ends of the connecting rod, a first sealing ring is mounted on the outer side surface of the first propulsion plate, and a second sealing ring is mounted on the outer side surface of the second propulsion plate, the test unit comprises an exhaust assembly mounted on the first propulsion plate and an exhaust valve mounted on the second propulsion plate, the pushing unit is used to drive the device as a whole to move relative to the pipeline, and the air pressure sensor is fixedly mounted on a side of the first propulsion plate close to the connecting rod.

[0007] Furthermore, the air extraction component includes an air pump and an air extraction pipe, the air pump is fixedly mounted on the first propulsion plate, one end of the air extraction pipe is connected to the air intake port of the air pump and the other end passes through the first propulsion plate.

[0008] Furthermore, the pushing unit includes a column, a plurality of support rods and a plurality of driving assemblies, the column is fixedly mounted on a side of the first pushing plate away from the connecting rod, the plurality of support rods are evenly fixedly connected to the column in a circular shape, and the plurality of driving assemblies are mounted on the support rods one by one.

[0009] Furthermore, the driving assembly includes a connecting seat, a motor, a rotating shaft and a driving wheel. The connecting seat is fixedly connected to an end of the support rod away from the column, the rotating shaft is rotatably connected to the connecting seat, the driving wheel is installed on the rotating shaft and can rotate relative to the connecting seat, and the motor is fixedly installed on the connecting seat and its output shaft is connected to the rotating shaft.

[0010] Furthermore, it also includes a spray unit, which includes a water supply component and a connecting ring. The water supply component and the connecting ring are both installed on the side of the second propulsion plate away from the connecting rod. A plurality of atomizing nozzles are evenly and equidistantly arranged on the outer side of the connecting ring. The water supply component can inject water into the connecting ring.

[0011] Furthermore, the water supply assembly includes a water storage box, a liquid pump, a first connecting pipe and a second connecting pipe, the water storage box and the liquid pump are both fixedly mounted on the second propulsion plate, one end of the first connecting pipe is connected to the liquid outlet of the liquid pump and the other end thereof is connected to the connecting ring, one end of the second connecting pipe is connected to the liquid suction port of the liquid pump and the other end thereof is connected to the water storage box.

[0012] The beneficial effects of the utility model are:

[0013] 1. When the utility model conducts a hydrogen embrittlement sensitivity test on a hydrogen-doped natural gas pipeline, the device is sent into the pipeline as a whole, and the air pump is started to pump air to determine whether cracks and leakage occur in the pipeline body section where the first propulsion plate and the second propulsion plate are located. After the motor is started, the first propulsion plate, the connecting rod and the second propulsion plate are driven to continue moving deep into the pipeline body, and the entire pipeline can be continuously pushed forward to complete the segmented test. The test device is small in size and low in cost, which effectively saves the cost of hydrogen embrittlement sensitivity test for natural gas pipelines;

[0014] 2. In the utility model, when the motor starts the propulsion device to move forward as a whole inside the pipeline, the liquid pump is started, and water mist can be evenly sprayed on the inner wall of the pipeline body from the atomizing nozzle position. Then, when the first propulsion plate and the second propulsion plate are pushed deep into the pipeline body, the inner wall of the pipeline body has sprayed water mist, which can reduce friction and avoid wear and tear of the device during continuous pushing, which leads to reduced air tightness, and effectively improves the test accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall structure of the utility model is shown in FIG. Figure 1 ;

[0016] Figure 2 The overall structure of the utility model is shown in FIG. Figure 1 ;

[0017] Figure 3 This is a schematic diagram of the installation structure of various components on the first propulsion plate of the utility model;

[0018] Figure 4 This is a schematic diagram of the installation structure of various components on the second propulsion plate of the utility model;

[0019] Explanation of the reference numerals in the accompanying drawings: 1. pipeline; 2. connecting rod; 301. first propulsion plate; 302. column; 303. support rod; 304. connecting seat; 305. motor; 306. rotating shaft; 307. driving wheel; 308. air pump; 309. exhaust pipe; 310. air pressure sensor; 311. first sealing ring; 401. second propulsion plate; 402. second sealing ring; 403. exhaust valve; 404. connecting ring; 405. atomizing nozzle; 406. first connecting pipe; 407. liquid extraction pump; 408. second connecting pipe; 409. water storage box. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer and more understandable, the technical solution of the utility model will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a hydrogen embrittlement sensitivity test device for a hydrogen-doped natural gas pipeline provided in this embodiment includes a connecting rod 2, a first propulsion plate 301, a second propulsion plate 401, an air pressure sensor 310, a test unit and a pushing unit. The first propulsion plate 301 and the second propulsion plate 401 are fixedly mounted on both ends of the connecting rod 2, respectively. The outer side surface of the first propulsion plate 301 is provided with a first sealing ring 311, and the outer side surface of the second propulsion plate 401 is provided with a second sealing ring 402. The test unit includes an exhaust assembly installed on the first propulsion plate 301 and an exhaust valve 403 installed on the second propulsion plate 401. The pushing unit is used to drive the device as a whole to move relative to the pipeline 1. The air pressure sensor 310 is fixedly mounted on the side of the first propulsion plate 301 close to the connecting rod 2.

[0023] During the test, the entire device needs to be sent into the pipeline 1. Since the outer side surface of the first propulsion plate 301 is provided with a first sealing ring 311, and the outer side surface of the second propulsion plate 401 is provided with a second sealing ring 402, the first propulsion plate 301 and the second propulsion plate 401 cooperate with the inner wall of the pipeline 1 to form a sealed space. Then, the vacuum assembly extracts the gas in the sealed space. The air pressure data during the vacuum process can be monitored by the air pressure sensor 310 to determine whether there are cracks in the pipeline 1 between the first propulsion plate 301 and the second propulsion plate 401. After the detection is completed, the exhaust valve 403 is opened to restore the air pressure in the sealed space, and then the entire device is driven by the pushing unit to move to the next pipeline interval in the pipeline 1 for testing.

[0024] The air extraction assembly includes an air pump 308 and an air extraction pipe 309. The air pump 308 is fixedly mounted on the first propulsion plate 301. One end of the air extraction pipe 309 is connected to the air inlet of the air pump 308 and the other end thereof runs through the first propulsion plate 301. After the air pump 308 is started, since the air extraction pipe 309 runs through the first propulsion plate 301, air can be extracted from the inner side of the first propulsion plate 301 through the air extraction pipe 309.

[0025] The pushing unit includes a column 302, a plurality of support rods 303 and a plurality of driving components. The column 302 is fixedly mounted on the side of the first pushing plate 301 away from the connecting rod 2. The plurality of support rods 303 are evenly fixedly mounted on the column 302 in a circumferential shape. The plurality of driving components are mounted one by one on the supporting rod 303. The driving component includes a connecting seat 304, a motor 305, a rotating shaft 306 and a driving wheel 307. The connecting seat 304 is fixedly mounted on one end of the supporting rod 303 away from the column 302. The rotating shaft 306 is rotatably mounted on the connecting seat 304. The driving wheel 307 is mounted on the rotating shaft 306 and can rotate relative to the connecting seat 304. The motor 305 is fixedly mounted on the connecting seat 304 and its output shaft is connected to the rotating shaft 306.

[0026] Starting the motor 305 can drive the driving wheel 307 to rotate. The outer surface of the driving wheel 307 is provided with an anti-slip texture. When the driving wheel 307 rotates, the friction between the driving wheel 307 and the inner wall of the pipeline 1 can drive the entire device to move relative to the pipeline 1, so that the entire device moves to the next section of the pipeline 1 for testing.

[0027] Example 2

[0028] like Figure 4 As shown, the hydrogen embrittlement sensitivity test device for hydrogen-doped natural gas pipeline also includes a spray unit, which includes a water supply component and a connecting ring 404. The water supply component and the connecting ring 404 are both installed on the side of the second propulsion plate 401 away from the connecting rod 2. A plurality of atomizing nozzles 405 are evenly and equidistantly arranged on the outer side of the connecting ring 404. The water supply component includes a water storage box 409, a liquid pump 407, a first connecting pipe 406 and a second connecting pipe 408. The water storage box 409 and the liquid pump 407 are both fixedly installed on the second propulsion plate 401. One end of the first connecting pipe 406 is connected to the liquid outlet of the liquid pump 407 and the other end thereof is connected to the connecting ring 404. One end of the second connecting pipe 408 is connected to the liquid suction port of the liquid pump 407 and the other end thereof is connected to the water storage box 409.

[0029] By starting the liquid pump 407, clean water can be extracted from the water storage box 409 through the second connecting pipe 408, and then the clean water is transported to the connecting ring 404 through the first connecting pipe 406, and finally water mist is sprayed from the atomizing nozzle 405 to the inner wall of the pipeline 1. This can reduce friction and avoid the pipeline 1 being worn during the continuous movement of the device, resulting in reduced air tightness of the pipeline 1 and affecting the accuracy of the test results.

[0030] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A hydrogen embrittlement sensitivity test device for hydrogen-blended natural gas pipeline, characterized in that: It includes a connecting rod, a first propulsion plate, a second propulsion plate, an air pressure sensor, a test unit and a pushing unit. The first propulsion plate and the second propulsion plate are respectively fixedly installed on both ends of the connecting rod. The outer side surface of the first propulsion plate is covered with a first sealing ring, and the outer side surface of the second propulsion plate is covered with a second sealing ring. The test unit includes an exhaust assembly installed on the first propulsion plate and an exhaust valve installed on the second propulsion plate. The pushing unit is used to drive the device as a whole to move relative to the pipeline. The air pressure sensor is fixedly installed on the side of the first propulsion plate close to the connecting rod.

2. The hydrogen embrittlement sensitivity test device for hydrogen-blended natural gas pipeline according to claim 1 is characterized in that: The air extraction assembly comprises an air pump and an air extraction pipe. The air pump is fixedly mounted on the first propulsion plate. One end of the air extraction pipe is connected to the air intake port of the air pump and the other end thereof passes through the first propulsion plate.

3. The hydrogen embrittlement sensitivity test device for hydrogen-blended natural gas pipeline according to claim 1, characterized in that: The pushing unit includes a column, a plurality of support rods and a plurality of driving assemblies. The column is fixedly mounted on a side of the first pushing plate away from the connecting rod. The plurality of support rods are evenly fixedly connected to the column in a circular shape. The plurality of driving assemblies are mounted on the support rods one by one.

4. The hydrogen embrittlement sensitivity test device for hydrogen-blended natural gas pipeline according to claim 3 is characterized in that: The driving assembly includes a connecting seat, a motor, a rotating shaft and a driving wheel. The connecting seat is fixedly connected to an end of the support rod away from the column, the rotating shaft is rotatably connected to the connecting seat, the driving wheel is installed on the rotating shaft and can rotate relative to the connecting seat, and the motor is fixedly installed on the connecting seat and its output shaft is connected to the rotating shaft.

5. The hydrogen embrittlement sensitivity test device for hydrogen-blended natural gas pipeline according to claim 1, characterized in that: It also includes a spray unit, which includes a water supply component and a connecting ring. The water supply component and the connecting ring are both installed on the side of the second propulsion plate away from the connecting rod. A plurality of atomizing nozzles are evenly and equidistantly arranged on the outer side of the connecting ring. The water supply component can inject water into the connecting ring.

6. The hydrogen embrittlement sensitivity test device for hydrogen-blended natural gas pipeline according to claim 5, characterized in that: The water supply assembly includes a water storage box, a liquid pump, a first connecting pipe and a second connecting pipe. The water storage box and the liquid pump are both fixedly mounted on the second propulsion plate. One end of the first connecting pipe is connected to the liquid outlet of the liquid pump and the other end is connected to the connecting ring. One end of the second connecting pipe is connected to the liquid suction port of the liquid pump and the other end is connected to the water storage box.

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