CN214277842U - Coal bed gas pipeline corrodes and destroys analog system - Google Patents
Coal bed gas pipeline corrodes and destroys analog system Download PDFInfo
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- CN214277842U CN214277842U CN202022860040.7U CN202022860040U CN214277842U CN 214277842 U CN214277842 U CN 214277842U CN 202022860040 U CN202022860040 U CN 202022860040U CN 214277842 U CN214277842 U CN 214277842U
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- 239000003245 coal Substances 0.000 title claims abstract description 61
- 239000007789 gas Substances 0.000 claims abstract description 119
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 38
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 32
- 230000007797 corrosion Effects 0.000 claims abstract description 31
- 238000005260 corrosion Methods 0.000 claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 16
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 13
- 230000006378 damage Effects 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 10
- 238000011045 prefiltration Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims 2
- 238000006297 dehydration reaction Methods 0.000 claims 2
- 238000004088 simulation Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- -1 moisture content Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 231100000817 safety factor Toxicity 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Abstract
The utility model discloses a corrosion damage simulation system for a coal bed gas transmission pipeline, which comprises a pure water tank (2), a nitrogen gas cylinder group (3), a carbon dioxide gas cylinder group (4) and a methane gas cylinder group (5); the pure water tank (2) is connected with the pure water filter (1) and is connected with a pure water atomizer (23) through a gate valve I (10 a) and a mass flow meter IV (7 d) in sequence, and the pure water atomizer (23) is connected with a gas-steam mixer (9); nitrogen gas cylinder group (3) loop through pneumatic control valve III (6 c) and mass flow meter III (7 c) and connect gas mixing sled (8), and carbon dioxide gas cylinder group (4) loop through pneumatic control valve II (6 b) and mass flow meter II (7 b) and connect gas mixing sled (8), and methane gas cylinder group (5) loop through pneumatic control valve I (6 a) and mass flow meter I (7 a) and connect gas mixing sled (8). The utility model discloses the realization is synthesized to multiplex condition, multifactor and is simulated coal bed gas pipeline corruption, destruction characteristic.
Description
Technical Field
The utility model relates to a coal bed gas transmission pipeline field specifically is a coal bed gas transmission pipeline corrodes and destroys analog system.
Background
The coal bed gas pipeline has the characteristics of high pressure, long distance, large flow and complexity and changeability along laying in the gas transmission process, the pipeline is influenced by various factors such as temperature change, water in gas, acid gas and the like, the coal bed gas pipeline is subjected to chemical or electrochemical corrosion in the operation process, the coal bed gas pipeline is damaged, and the operation cost and risk of the coal bed gas pipeline are increased. For a long time, the analysis of the corrosion factors of the coal bed gas pipeline is mainly based on the summary and conclusion of production experience, and then internal and external anticorrosion control measures are formulated. In order to effectively control corrosion factors in the operation process of the coal bed gas pipeline, the system life cycle analysis of the pipeline corrosion factors is needed, the pipeline corrosion rule, the corrosion modes under different operation scenes and the leading factors of the corrosion modes are determined, and in order to achieve the research goal, a corresponding pipeline simulation system needs to be designed and then verified on a production operation pipeline.
For buried coal bed gas long-distance medium and high pressure pipelines, carbon steel pipes are mostly adopted, so that corrosion always runs through production operation. Because coal bed gas generally contains moisture, carbon dioxide and hydrogen sulfide gas, the inner and outer walls of a pipeline which runs for a long time generally corrode, and potential safety hazards are caused to safety production. The corrosion factors of the coal bed gas pipeline are complicated, and the corrosion mechanisms are different under different climatic and geological environments.
The reasons for corrosion of pipelines mainly include:
(1) and (6) corroding the soil. The buried pipeline soil is composed of three phases of solid, liquid and gas, and the electrochemical action of a large amount of water molecules and ions contained in the soil is an important factor for causing pipeline corrosion.
(2) Pipeline material factors. The physical and chemical properties of the pipe material and the surface morphology influence the corrosion of the pipe to some extent. Generally, the more stable the metal chemistry, the less reactive it is to react with ions in the water and the greater the resistance to corrosion from the outside. But the material is reasonably selected by comprehensively considering the weather, environment and safety factors in consideration of the laying cost of the pipeline.
(3) Moisture in the coal bed gas is the most important factor for corrosion in the pipeline, other metal elements in coal can be dissolved in the coal bed gas water, and if the inner wall of the adsorption pipeline is combined with the pipeline metal, a primary battery can be formed, so that the corrosion speed is accelerated. Meanwhile, the moisture contained in the pipeline is easy to cause bacterial growth and bacterial corrosion. The method is characterized in that the content of water in the coal bed gas is controlled, the water corrosion mechanism and law in the coal bed gas are mastered, and corresponding production operation measures are formulated, so that the method is the key for ensuring the long-term stable operation of the coal bed gas pipeline.
The water in the coal bed gas mainly comes from three sources, and firstly, the water contained in the natural gas (coal bed gas) in the mining process is treated by a purification process, but the water is often not thoroughly removed due to the factors of long-time operation of equipment, large change of the water content in the natural gas and the like, and water is accumulated in a pipeline after long-time operation. And secondly, moisture remains in the low-lying or bent part of the pipeline after the pipeline construction is pressed and dried, although the pipeline is swept and dried, a large amount of water still exists in a part of special pipe sections, and the longer the pipeline distance is, the more complex the terrain is, the more water remains in the pipeline. Thirdly, when the pipelines in the individual sections are overhauled, the pipelines are cut open and exposed in the air, so that moist air enters the pipelines and is adsorbed on the inner wall of the pipeline, and when the pipelines are used again, moisture is increased and accumulated when the pipelines are operated again. The water in natural gas/coal bed gas exists in the gas transmission pipeline mainly in a free state and a gaseous molecular form.
In view of the corrosion reasons of the coal bed gas pipeline, the factors are integrated, and a corresponding simulation system is designed.
Disclosure of Invention
The utility model aims at providing a coal bed gas transmission pipeline corrodes and destroys analog system, this system can simulate under different gas transmission pressure, coal bed gas composition, moisture content, mineral composition and the electric potential process condition, and the coal bed gas pipeline corrodes and destroys the characteristic, can be used to the analysis coal bed gas transmission pipeline corrodes the leading factor of destruction under different work condition.
The utility model discloses an adopt following technical scheme to realize:
a system for simulating corrosion damage of a coal bed gas pipeline comprises a pure water tank, a nitrogen gas cylinder group, a carbon dioxide gas cylinder group, a methane gas cylinder group and the like.
The pure water tank is connected with the pure water filter and then sequentially connected with the pure water atomizer through the gate valve I and the mass flow meter IV, and the pure water atomizer is connected with the inlet of the gas-steam mixer.
Nitrogen gas cylinder group loops through pneumatic control valve III and mass flow meter III and connects and mix the gas sled import, carbon dioxide gas cylinder group loops through pneumatic control valve II and mass flow meter II and connects and mix the gas sled import, methane gas cylinder group loops through pneumatic control valve I and mass flow meter I and connects and mix the gas sled import.
The gas-liquid separator is connected with a gate valve II and then divided into two paths, one path is connected with a particle adding hopper through a gate valve III, the other path is connected with a front filter through a mass flow meter V, the two paths are connected with the inlet of a multi-bending coal bed gas pipeline through a gate valve IV after being converged, the outlet of the multi-bending coal bed gas pipeline is connected with a particulate filter, the particulate filter is connected with the inlet of a dewatering device, the outlet of the dewatering device is connected with a circulating compressor through the gate valve V, and the circulating compressor is connected with the inlet of the multi-bending coal bed gas pipeline.
When the device works, nitrogen, carbon dioxide and methane are respectively input into a gas mixing pry from a nitrogen gas cylinder group, a carbon dioxide gas cylinder group and a methane gas cylinder group according to different proportions through respective pneumatic regulating valves and mass flow meters under the same pressure, are fully mixed and then are introduced into a gas-steam mixer and are static, water flows out of a pure water tank, is introduced into a pure water atomizer through a pure water filter and is atomized, then enters the gas-steam mixer and is mixed with mixed gas and is static, then enters a gas-liquid separator, the mixed gas flows out from the top (liquid is discharged through a lower valve) and is divided into two paths, one path enters a particle adding funnel (whether particles are carried or not is controlled through a gate valve III), the other path enters a pre-filter through which the two paths are converged, enters a multi-curvature coal bed gas pipeline, flows out, then enters a dewatering device through the filter, and then is pressurized through a circulating compressor, and re-entering the coal bed gas pipeline. Through the different combinations of pure water tank, nitrogen gas cylinder group, carbon dioxide gas cylinder group, methane gas cylinder group, granule install the funnel additional, can simulate under different components, water content and the solid particle impurity operating mode, the corrosion process of simulation coal bed gas pipeline.
The utility model discloses a simulate different components, under water content and the solid particle impurity operating mode, simulate the corrosion process of coal bed gas pipeline, and can simulate moisture in the pipeline gather the process and gather the form, realize the research to coal bed gas pipeline's corruption characteristic and master control factor, through changing plus positive voltage, vapor content, gas composition, particulate matter content, particle diameter and component parameter, detect the broken speech rate change of coal bed gas pipeline corrosion, gather the characteristic through exploring impurity in the coal bed gas pipeline, reveal under the different work condition coal bed gas pipeline corrosion failure mechanism and master control factor.
Drawings
Fig. 1 shows a schematic structural diagram of the present invention.
In the figure: 1-a pure water filter, 2-a pure water tank, 3-a nitrogen gas cylinder group, 4-a carbon dioxide gas cylinder group, 5-a methane gas cylinder group, 6 a-a pneumatic regulating valve I, 6 b-a pneumatic regulating valve II, 6 c-a pneumatic regulating valve III, 6 d-a pneumatic regulating valve IV, 7 a-a mass flow meter I, 7 b-a mass flow meter II, 7 c-a mass flow meter III, 7 d-a mass flow meter IV, 7 e-a mass flow meter V, 8-a gas mixing pry, 9-a gas-gas mixer, 10 a-a gate valve I, 10 b-a gate valve II, 10 c-a gate valve III, 10 d-a gate valve IV, 10 e-a gate valve V, 10 f-a gate valve VI, 11-a particle charging hopper, 12-a circulating compressor and 13-a compression buffer tank, 14-a particulate filter, 15-a dewatering device, 16-a multi-curvature coal bed gas pipeline, 17-a grounding circuit, 18-a pipeline support, 19-a liquid holdup detector, 20-a variable direct current power supply, 21-a pre-filter, 22-a gas-liquid separator and 23-a pure water atomizer.
Detailed Description
The following describes in detail specific embodiments of the present invention with reference to the accompanying drawings.
A system for simulating corrosion damage of a coal bed gas transmission pipeline mainly comprises a pure water tank 2, a nitrogen gas cylinder group 3, a carbon dioxide gas cylinder group 4, a methane gas cylinder group 5 and the like.
As shown in FIG. 1, the pure water tank 2 is connected to the pure water filter 1, and then connected to the pure water atomizer 23 via a gate valve I10 a and a mass flow meter IV 7d in this order, and the pure water atomizer 23 is connected to the inlet of the gas-steam mixer 9.
As shown in figure 1, the nitrogen gas cylinder group 3 is connected with an inlet of a gas mixing pry 8 through a pneumatic regulating valve III 6c and a mass flow meter III 7c in sequence, the carbon dioxide gas cylinder group 4 is connected with an inlet of a gas mixing pry 8 through a pneumatic regulating valve II 6b and a mass flow meter II 7b in sequence, and the methane gas cylinder group 5 is connected with an inlet of a gas mixing pry 8 through a pneumatic regulating valve I6 a and a mass flow meter I7 a in sequence.
As shown in fig. 1, the outlet of the gas mixing lever 8 is connected with the inlet of the gas-steam mixer 9, the outlet of the gas-steam mixer 9 is connected with the inlet of the gas-liquid separator 22, and the discharge ports of the gas mixing lever 8, the gas-steam mixer 9 and the gas-liquid separator 22 are all connected with a discharge pipeline through valves. The gas outlet of the gas-liquid separator 22 is connected with a gate valve II 10b and then divided into two paths, one path is connected with a particle adding funnel 11 through a gate valve III 10c, the other path is connected with a pre-filter 21 through a mass flow meter V7 e (the pre-filter 21 mainly filters liquid water, the water is firstly vaporized, but part of the condensed water is generated in the flowing process, filtering treatment is carried out before the condensed water enters a pipeline, a particle filter 14 mainly filters particles), the two paths are converged and then connected with an inlet of a multi-curvature coal bed gas pipeline 16 through a gate valve IV 10d, the multi-curvature coal gas pipeline 16 is fixed on the ground through a plurality of pipeline supports 18, an outlet of the multi-curvature coal gas pipeline 16 is connected with the particle filter 14, the particle filter 14 is connected with an inlet of a dewatering tank 15, an outlet of the dewatering tank 15 is connected with a circulating compressor 12 through a gate valve V10 e, and the circulating compressor 12 is connected with an inlet of the multi-curvature coal gas pipeline 16. The multi-bending degree coal bed gas pipeline 16 is connected with a variable direct current power supply 20 and a grounding circuit 17 to form a loop. Each bend section of the multi-bend coalbed methane pipeline 16 is provided with a liquid holdup detector 19. A gate valve VI 10f, a compression buffer tank 13 and a pneumatic control valve IV 6d are connected between the two ends of the circulating compressor 12.
When the device works, nitrogen, carbon dioxide and methane are respectively input into a gas mixing pry 8 from a nitrogen gas cylinder group 3, a carbon dioxide gas cylinder group 4 and a methane gas cylinder group 5 according to different proportions through respective pneumatic regulating valves and mass flow meters under the same pressure, are fully mixed, are introduced into a gas-steam mixer 9 and are static, water flows out of a pure water tank 2, is introduced into a pure water atomizer 23 through a pure water filter 1 and is atomized, then enters the gas-steam mixer 9 and is mixed with mixed gas and is static, then enters a gas-liquid separator 22, the mixed gas flows out of the top and is divided into two paths, one path enters a particle adding funnel 11 (whether particles are carried or not is controlled through a gate valve III 10 c), the other path passes through a pre-filter 21, is converged and then enters a multi-bending coal bed gas pipeline 16, flows out, passes through a particle filter 14, enters a dewatering device 15, and is pressurized through a circulating compressor 13, and re-entering the coal bed gas pipeline.
Through the different combinations of pure water tank 2, nitrogen gas cylinder group 3, carbon dioxide gas cylinder group 4, methane gas cylinder group 5, granule install funnel 11 additional, can simulate under different components, water content and the solid particle impurity operating mode, the corrosion process of simulation coal bed gas pipeline.
The particulate filter 14 is a removable component. When the pipeline needs cleaning after running, the pipeline can be disassembled for treatment. Since the bent pipe section is easy to collect water, after long-time simulation, the water content of the bent pipe section can be detected by the liquid holdup detector 19. The multi-bending degree coal bed gas pipeline is a carbon steel or metal pipeline, adjustable direct current positive voltage is added to the pipeline through a variable direct current power supply 20, and a loop is formed by the adjustable direct current positive voltage and the grounding circuit 17 and is used for detecting corrosion rates of pipelines with different voltages. Metal ions can be added into the pure water tank 2 according to the corrosion characteristics of the pipeline, and the electrochemical action of the metal ions is checked.
The utility model discloses can realize under the multiplex condition, the multifactor is synthesized corrode, destroy the characteristic and simulate coal bed gas pipeline. The gas components and the moisture can be accurately controlled, the number of the coal bed gas pipelines and the number of the bent pipes thereof are modularly designed, and the coal bed gas pipelines and the bent pipes thereof can be replaced according to metal materials and simulated terrain conditions.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the detailed description is made with reference to the embodiments of the present invention, those skilled in the art should understand that the technical solutions of the present invention are modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the protection scope of the claims of the present invention.
Claims (4)
1. The utility model provides a coal bed gas transmission pipeline corrodes and destroys analog system which characterized in that: comprises a pure water tank (2), a nitrogen gas bottle group (3), a carbon dioxide gas bottle group (4) and a methane gas bottle group (5);
the pure water tank (2) is connected with the pure water filter (1) and then is connected with a pure water atomizer (23) sequentially through a gate valve I (10 a) and a mass flow meter IV (7 d), and the pure water atomizer (23) is connected with an inlet of a gas-steam mixer (9);
the nitrogen gas cylinder group (3) is connected with an inlet of the gas mixing pry (8) through a pneumatic regulating valve III (6 c) and a mass flow meter III (7 c) in sequence, the carbon dioxide gas cylinder group (4) is connected with an inlet of the gas mixing pry (8) through a pneumatic regulating valve II (6 b) and a mass flow meter II (7 b) in sequence, and the methane gas cylinder group (5) is connected with an inlet of the gas mixing pry (8) through a pneumatic regulating valve I (6 a) and a mass flow meter I (7 a) in sequence;
the outlet of the gas mixing pry (8) is connected with the inlet of a gas-steam mixer (9), the outlet of the gas-steam mixer (9) is connected with the inlet of a gas-liquid separator (22), the gas outlet of the gas-liquid separator (22) is connected with a gate valve II (10 b) and then divided into two paths, one path is connected with a particle adding funnel (11) through a gate valve III (10 c), the other path is connected with a pre-filter (21) through a mass flow meter V (7 e), the two paths are converged and then connected with the inlet of a multi-bending coal bed gas pipeline (16) through a gate valve IV (10 d), the outlet of the multi-bending degree coal bed gas pipeline (16) is connected with a particulate matter filter (14), the particulate matter filter (14) is connected with the inlet of a dehydration device (15), the outlet of the dehydration device (15) is connected with a circulating compressor (12) through a gate valve V (10 e), the circulating compressor (12) is connected with an inlet of a multi-curvature coal bed gas pipeline (16).
2. The system for simulating the corrosion damage of the coal bed gas transmission pipeline according to claim 1, wherein: the multi-bending degree coal bed gas pipeline (16) is connected with a variable direct current power supply (20) and a grounding circuit (17) to form a loop.
3. The system for simulating the corrosion damage of the coal bed gas transmission pipeline according to claim 1, wherein: and a liquid holdup detector (19) is arranged on the bent pipe section of the multi-bending degree coal bed gas pipeline (16).
4. The system for simulating the corrosion damage of the coal bed gas transmission pipeline according to claim 1, wherein: and a gate valve VI (10 f), a compression buffer tank (13) and a pneumatic regulating valve IV (6 d) are connected between the two ends of the circulating compressor (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022860040.7U CN214277842U (en) | 2020-12-03 | 2020-12-03 | Coal bed gas pipeline corrodes and destroys analog system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022860040.7U CN214277842U (en) | 2020-12-03 | 2020-12-03 | Coal bed gas pipeline corrodes and destroys analog system |
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| Publication Number | Publication Date |
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| CN214277842U true CN214277842U (en) | 2021-09-24 |
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| CN202022860040.7U Expired - Fee Related CN214277842U (en) | 2020-12-03 | 2020-12-03 | Coal bed gas pipeline corrodes and destroys analog system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486543A (en) * | 2022-01-04 | 2022-05-13 | 浙江大学 | System and method for testing influence of trace gas impurities on high-pressure hydrogen embrittlement of material |
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2020
- 2020-12-03 CN CN202022860040.7U patent/CN214277842U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486543A (en) * | 2022-01-04 | 2022-05-13 | 浙江大学 | System and method for testing influence of trace gas impurities on high-pressure hydrogen embrittlement of material |
| CN114486543B (en) * | 2022-01-04 | 2024-06-07 | 浙江大学 | System and method for testing influence of trace gas impurities on high-pressure hydrogen embrittlement of material |
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Granted publication date: 20210924 |