CN116380367A - Hydrogen leakage monitoring device and monitoring method for shock tube of high-pressure hydrogen driver - Google Patents
Hydrogen leakage monitoring device and monitoring method for shock tube of high-pressure hydrogen driver Download PDFInfo
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- CN116380367A CN116380367A CN202310659137.7A CN202310659137A CN116380367A CN 116380367 A CN116380367 A CN 116380367A CN 202310659137 A CN202310659137 A CN 202310659137A CN 116380367 A CN116380367 A CN 116380367A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 212
- 239000001257 hydrogen Substances 0.000 title claims abstract description 209
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 209
- 230000035939 shock Effects 0.000 title claims abstract description 144
- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012806 monitoring device Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 20
- 230000000630 rising effect Effects 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 16
- 230000007797 corrosion Effects 0.000 claims description 10
- 238000005260 corrosion Methods 0.000 claims description 10
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000004880 explosion Methods 0.000 claims description 4
- 238000013022 venting Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000011897 real-time detection Methods 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000013459 approach Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Fluid Mechanics (AREA)
- Examining Or Testing Airtightness (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the technical field of hypersonic test equipment, and discloses a hydrogen leakage monitoring device and a monitoring method for a shock tube of a high-pressure hydrogen driver. The hydrogen leakage monitoring device is arranged outside the shock tube, the shock tube adopts an inner-outer nested double-layer structure and is divided into a plurality of sections from front to back, and leakage detection holes are arranged in the outer layers of the contact end surfaces; each buffer container is connected with a leakage detection hole and is summarized to a blow-down pipeline through a special leakage detection stop valve; the detecting instrument detects the pressure and the pressure rising speed of the buffer container; the pumping and discharging system discharges the hydrogen in the emptying pipeline to a safe area. The hydrogen leakage monitoring method can timely and accurately detect the hydrogen leakage of the shock tube, evaluate the leakage rate and position the leakage part; the leaked hydrogen can be collected and discharged in a centralized way, so that the hydrogen is prevented from diffusing into the environment. The invention is suitable for the shock tunnel with high-pressure hydrogen as driving gas and has engineering practical value.
Description
Technical Field
The invention belongs to the technical field of hypersonic test equipment, and particularly relates to a hydrogen leakage monitoring device and a monitoring method for a shock tube of a high-pressure hydrogen driver.
Background
The shock tunnel is a pulse type test device which compresses test gas by shock and then generates hypersonic test air flow by a steady expansion method.
The shock tunnel is generally composed of a driving section, a driven section, a spray pipe, a test section and the like in sequence. The driving section is separated from the driven section, the driven section and the spray pipe by diaphragms respectively, the driving section is filled with high-pressure driving gas, the driven section is filled with test gas with lower pressure, the spray pipe and the test section are vacuumized to simulate an air environment, and the test model is positioned in the test section at the outlet of the spray pipe. And then controlling the diaphragm of the driving section and the diaphragm of the driven section to be instantaneously opened to form strong shock waves, compressing the low-pressure test gas of the driven section to heat and boost the pressure, opening the diaphragm (two-path diaphragm) between the driven section and the spray pipe by the high-temperature high-pressure test gas formed by shock wave compression, and expanding and accelerating the spray pipe to form high Mach number test gas flow.
The shock strength is one of parameters for representing the driving performance of the shock wind tunnel, hydrogen can effectively improve the driving performance of the shock wind tunnel, a driving section with high-pressure hydrogen as driving gas is commonly called a high-pressure hydrogen driver, and the adoption of the high-pressure hydrogen driver is an effective means for improving the driving performance of the shock wind tunnel. However, hydrogen is easily absorbed, permeated and diffused into the material, which easily causes the material performance of the high-pressure hydrogen driver to be reduced, and hydrogen damage (hydrogen embrittlement in a broad sense) such as hydrogen induced plasticity loss, hydrogen induced cracking, hydrogen induced delayed fracture, hydrogen corrosion and the like is generated. Moreover, the high-pressure hydrogen driver stores high-pressure hydrogen for a long time, and once the pipe body material of the high-pressure hydrogen driver is damaged by hydrogen, serious accidents such as hydrogen leakage, explosion and the like can be caused.
The invention discloses a high-pressure hydrogen driver (application number 202211332270.3) for reducing the risk of hydrogen damage, and the main bearing members such as a driving section pipe body and a sealing head of the technical scheme adopt a double-layer structure, and main seals are arranged on a pipe lining. However, the technical scheme does not disclose how to quickly and accurately perform the necessary measures of controlling the safety risk of the ultra-high pressure hydrogen driving shock tunnel, such as hydrogen leakage detection after the occurrence of hydrogen leakage if the sealing failure occurs or the penetration crack of the material in the tube body is generated due to hydrogen-induced damage.
At present, the main mode of shock tube leakage detection is hydrogen leak detector approach detection and peripheral detection, and the approach detection judges the hydrogen leakage condition by monitoring the operation parameters such as pressure, temperature and the like in the shock tube in real time. Perimeter detection the hydrogen concentration in the environment is detected by a peripherally arranged hydrogen concentration detection meter. Wherein, limited by safety risks, proximity detection is generally only performed at lower pressures; perimeter detection is not a fast accurate detection when small leaks occur, leading to an enlarged risk.
Currently, there is a need to develop a hydrogen leakage monitoring device and a monitoring method for a shock tube of a high-pressure hydrogen driver.
Disclosure of Invention
The invention aims to provide a hydrogen leakage monitoring device of a shock tube of a high-pressure hydrogen driver, and aims to provide a hydrogen leakage monitoring method of a shock tube of a high-pressure hydrogen driver, which is used for overcoming the defects of the prior art.
The invention relates to a hydrogen leakage monitoring device of a shock tube of a high-pressure hydrogen driver, which is characterized in that the hydrogen leakage monitoring device is arranged outside the shock tube and comprises a leakage monitoring and collecting system and a pumping and discharging system; a plurality of high-pressure hydrogen leakage monitoring points are arranged on the shock tube; the leakage monitoring and collecting system is used for synchronously monitoring a plurality of high-pressure hydrogen leakage monitoring points of the shock tube; the pumping and discharging system is used for pumping and discharging high-pressure hydrogen leaked by the shock tube during shock tunnel test.
Further, the shock tube stores high-pressure hydrogen in a shock tunnel test, a driving section tube body and a driving section tube body end socket of the shock tube adopt an inner-outer nested double-layer structure, the driving section tube body sequentially comprises a lining and an outer layer from inside to outside, the lining is divided into a plurality of sections from front to back and corresponds to the lining, and the outer layer is divided into a plurality of equal sections from front to back; the driving section pipe body end socket is sequentially provided with an inner end socket and an outer end socket from inside to outside; the inner sealing is arranged on the contact end surfaces between the inner sealing head and each section of the inner lining, and the outer sealing is arranged on the contact end surfaces between the outer sealing head and each section of the outer layer; and leakage detection holes connected with the corresponding contact end surfaces are arranged in the outer layers of the contact end surfaces.
Further, the leakage monitoring and collecting system comprises buffer containers respectively connected with the leakage detection holes, each buffer container is provided with a special connection detection instrument, and each buffer container is summarized to the emptying pipeline through a special leakage detection stop valve; the detecting instrument is used for detecting the pressure of the buffer container and the pressure rising speed, when the detected pressure of the buffer container is larger than the initial pressure of the buffer container, the high-pressure hydrogen in the shock tube is judged to leak at the corresponding contact end face, and then the high-pressure hydrogen leakage rate is calculated through the pressure rising speed, namely the pressure rising speed.
Further, the pumping and discharging system comprises a vacuum pump, an evacuating valve and an evacuating valve, wherein the vacuum pump and the evacuating valve are sequentially connected into one path, the evacuating valve is the other path, and the two paths are connected in parallel on an interface of an evacuating pipeline; the pumping and discharging system discharges the hydrogen in the emptying pipeline to a safe area, when the gas pressure in the emptying pipeline exceeds one atmosphere, the hydrogen is discharged through the emptying valve, and when the gas pressure in the emptying pipeline is lower than one atmosphere, the hydrogen is discharged through the vacuum pump; the vacuum pump is used for evacuating the gas in the emptying pipeline, the gas comprises leaked hydrogen and residual air, the leaked hydrogen is used for reducing the corrosion of the leaked hydrogen to the outer layer, and the residual air is used for avoiding the explosion caused by the mixing of the leaked hydrogen and the residual air.
Further, the pressure range of the high-pressure hydrogen is 10 MPa-200 MPa.
Further, the outer layer is made of high-strength alloy steel and is used for bearing the high-pressure load of the shock tube, and the inner lining is preferably made of hydrogen-resistant alloy and is used for isolating and resisting high-pressure hydrogen corrosion.
Further, the lining seal is a main seal and is used for preventing high-pressure hydrogen of the shock tube from leaking to the outer layer; the outer seal is an auxiliary seal for preventing high-pressure hydrogen of the shock tube from leaking into the environment after the main seal fails or the lining is broken.
The invention relates to a hydrogen leakage monitoring method of a shock tube of a high-pressure hydrogen driver, which comprises a test monitoring pressure relief flow, and specifically comprises the following steps:
s10, vacuumizing a shock tube before a test;
before the test of the shock tunnel, closing the emptying valve, opening the vacuum pump, opening the leak detection stop valve and the evacuating valve, evacuating the emptying pipeline to the set pressure, and closing the evacuating valve and the leak detection stop valve;
s11, filling high-pressure hydrogen into the shock tube for real-time detection;
filling high-pressure hydrogen into the shock tube, collecting the pressure value of each detection instrument in real time and calculating the average pressure rise rate in one minute in the process of boosting the shock tube, judging whether high-pressure hydrogen leakage exists or not according to a preset dangerous threshold value, and determining the leakage position according to the position of the detection instrument where the high-pressure hydrogen leakage occurs;
s12, finding out high-pressure hydrogen leakage, and stopping filling the shock tube with the high-pressure hydrogen;
if high-pressure hydrogen leakage is found, sequentially opening a leakage detection stop valve and a vent valve at the leakage part, and discharging the hydrogen in the buffer container at the leakage part to the atmosphere; simultaneously, sending alarm information to a general control system of the shock tunnel, stopping the test of filling high-pressure hydrogen into the shock tube by the general control system of the shock tunnel, and removing the high-pressure hydrogen in the shock tube;
s13, the shock tube is decompressed and the emptying pipeline is evacuated;
after the high-pressure hydrogen in the shock tube is decompressed to normal pressure, the emptying valve is closed, the vacuum pump is opened, the emptying valve is opened, and the hydrogen in the emptying pipeline is extracted;
s14, checking and maintaining the shock tube;
and checking the shock tube, confirming the leakage position and maintaining the shock tube.
The hydrogen leakage monitoring method of the shock tube of the high-pressure hydrogen driver further comprises a forced pressure relief flow;
in order to avoid hydrogen leakage to corrode the outer layer, when any one of the detection instruments reaches a set value or after the secondary shock tunnel test is finished, a forced pressure relief flow is started no matter whether high-pressure hydrogen leakage exists or not, and the specific steps are as follows:
s20, the detection instrument reaches a set value or when the shock wave wind tunnel test is finished;
s21, evacuating hydrogen in the buffer container at the leakage part;
sequentially opening a leak detection stop valve and a vent valve of the leakage part, and discharging hydrogen in a buffer container of the leakage part to the atmosphere;
s22, extracting hydrogen in the emptying pipeline;
closing the emptying valve, starting the vacuum pump, opening the evacuating valve, and pumping out the hydrogen in the emptying pipeline;
s23, checking the shock tube, and performing maintenance.
Further, the set value is less than or equal to 10MPa.
According to the hydrogen leakage monitoring device and the monitoring method for the shock tube of the high-pressure hydrogen driver, provided by the invention, on one hand, hydrogen between the shock tube layers can be thoroughly extracted, and the damage risk is reduced as much as possible; when checking and confirming the leakage point, the vacuum pressure difference between the inside and the outside of the shock tube can be utilized to accurately confirm the leakage position.
The hydrogen leakage monitoring device and the monitoring method of the shock tube of the high-pressure hydrogen driver limit the applicable pressure range of the high-pressure hydrogen to 10-200 MPa, are technically applicable to lower pressure, but considering social and economic benefits, the higher the pressure of the high-pressure hydrogen is, the larger the leakage risk and hazard are, the larger the leakage detection benefit is, and the pressure range of the high-pressure hydrogen is limited to 10-200 MPa by comprehensively considering practicability and economy.
The outer layer of the shock tube in the hydrogen leakage monitoring device and the monitoring method of the shock tube of the high-pressure hydrogen driver is preferably made of high-strength alloy steel, is suitable for bearing the high-pressure load of the shock tube, and can also be made of other materials with lower strength and thicker thickness; the liner is preferably made of a hydrogen resistant alloy and is suitable for isolating and resisting high pressure hydrogen corrosion.
The hydrogen leakage monitoring device and the monitoring method for the shock tube of the high-pressure hydrogen driver can timely and accurately detect the hydrogen leakage of the shock tube and evaluate the leakage rate, and realize the positioning of the leakage part; the leaked hydrogen can be collected and discharged in a centralized way, so that the hydrogen is prevented from diffusing into the environment; the method is suitable for the shock tunnel with high-pressure hydrogen as driving gas, and has engineering practical value.
Drawings
FIG. 1 is a schematic diagram of a shock tube hydrogen leakage monitor for a high pressure hydrogen driver according to the present invention;
FIG. 2 is a flow chart of pressure relief for test monitoring of the method for monitoring hydrogen leakage of shock tube of high pressure hydrogen driver according to the present invention;
fig. 3 is a forced pressure relief flow chart of the method for monitoring the hydrogen leakage of the shock tube of the high-pressure hydrogen driver according to the present invention.
In the figure, 1. Shock tube; 2. a leak monitoring collection system; 3. a pumping and discharging system;
101. an outer layer; 102. a lining; 103. sealing the outer layer; 104. sealing the inner lining; 105. a leak detection hole;
201. a buffer container; 202. a detection instrument; 203. leak detection stop valve;
301. a vacuum pump; 302. an evacuation valve; 303. and a vent valve.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
Example 1:
as shown in fig. 1, the hydrogen leakage monitoring device of the shock tube of the high-pressure hydrogen driver of the embodiment is arranged outside the shock tube 1 and comprises a leakage monitoring and collecting system 2 and a pumping and discharging system 3; a plurality of high-pressure hydrogen leakage monitoring points are arranged on the shock tube 1; the leakage monitoring and collecting system 2 is used for synchronously monitoring a plurality of high-pressure hydrogen leakage monitoring points of the shock tube 1; the pumping and discharging system 3 is used for pumping and discharging high-pressure hydrogen leaked by the shock tube 1 during shock tunnel test.
Further, the shock tube 1 stores high-pressure hydrogen in a shock tunnel test, a driving section tube body and a driving section tube body end socket of the shock tube 1 adopt an inner-outer nested double-layer structure, the driving section tube body sequentially comprises a lining 102 and an outer layer 101 from inside to outside, the lining 102 is divided into a plurality of sections from front to back, the sections correspond to the lining 102, and the outer layer 101 is divided into a plurality of equal sections from front to back; the driving section pipe body end socket is sequentially provided with an inner end socket and an outer end socket from inside to outside; the inner sealing 104 is arranged on the contact end surfaces between the inner sealing head and each section of the inner lining 102, and the outer sealing 103 is arranged on the contact end surfaces between the outer sealing head and each section of the outer layer 101; a leak detection hole 105 connected to the corresponding contact end surface is provided in the outer layer 101 of each contact end surface.
Further, the leakage monitoring and collecting system 2 includes buffer containers 201 connected to the leakage detecting holes 105, wherein each buffer container 201 is provided with a dedicated connection detecting instrument 202, and each buffer container 201 is collected to the blow-down pipe through a dedicated leak detecting stop valve 203; the detecting instrument 202 is used for detecting the pressure and the pressure rising speed of the buffer container 201, when the detected pressure of the buffer container 201 is greater than the initial pressure of the buffer container 201, the high-pressure hydrogen in the shock tube 1 is judged to leak at the corresponding contact end face, and then the high-pressure hydrogen leakage rate is calculated through the pressure rising speed, namely the pressure rising speed.
Further, the pumping and exhausting system 3 comprises a vacuum pump 301, an evacuating valve 302 and an evacuating valve 303, wherein the vacuum pump 301 and the evacuating valve 302 are sequentially connected into one path, the evacuating valve 303 is the other path, and the two paths are connected in parallel on an interface of an evacuating pipeline; the pumping and discharging system 3 discharges the hydrogen in the vent pipeline to a safe area, when the gas pressure in the vent pipeline exceeds one atmosphere, the hydrogen is discharged through the vent valve 303, and when the gas pressure in the vent pipeline is lower than one atmosphere, the hydrogen is discharged through the vacuum pump 301; the vacuum pump 301 is used to evacuate the gas in the venting line, which includes leaked hydrogen gas to reduce the corrosion of the outer layer 101 by the leaked hydrogen gas and residual air to avoid explosion caused by the mixture of the leaked hydrogen gas and the residual air.
Further, the pressure range of the high-pressure hydrogen is 10 MPa-200 MPa.
Further, the outer layer 101 is made of high-strength alloy steel for bearing the high-pressure load of the shock tube 1, and the inner liner 102 is preferably made of hydrogen-resistant alloy for isolating and resisting the corrosion of high-pressure hydrogen.
Further, the lining seal 104 is a main seal, and is used for preventing high-pressure hydrogen of the shock tube 1 from leaking to the outer layer 101; the outer seal 103 is an auxiliary seal for preventing high pressure hydrogen of the shock tube 1 from leaking into the environment after the main seal fails or the liner 102 breaks.
As shown in fig. 2, the method for monitoring hydrogen leakage of the shock tube of the high-pressure hydrogen driver according to the embodiment includes a test monitoring pressure release flow, which specifically includes the following steps:
s10, vacuumizing the shock tube 1 before a test;
before the test of the shock tunnel, closing the evacuation valve 303, opening the vacuum pump 301, opening the leak detection stop valve 203 and the evacuation valve 302, evacuating the evacuation pipeline to the set pressure, and then closing the evacuation valve 302 and the leak detection stop valve 203;
s11, filling high-pressure hydrogen into the shock tube 1 for real-time detection;
filling high-pressure hydrogen into the shock tube 1, collecting the pressure value of each detection instrument 202 in real time and calculating the average pressure rise rate in one minute in the process of boosting the shock tube 1, judging whether high-pressure hydrogen leakage exists or not according to a preset dangerous threshold value, and determining the leakage position according to the position of the detection instrument 202 where the high-pressure hydrogen leakage occurs;
s12, finding out high-pressure hydrogen leakage, and stopping filling the shock tube 1 with the high-pressure hydrogen;
if high-pressure hydrogen gas leakage is found, the leak detection stop valve 203 and the vent valve 303 of the leakage part are sequentially opened, and the hydrogen gas in the buffer container 201 of the leakage part is discharged to the atmosphere; simultaneously, sending alarm information to a general control system of the shock tunnel, stopping the test of the general control system of the shock tunnel, filling high-pressure hydrogen into the shock tube 1, and discharging the high-pressure hydrogen in the shock tube 1;
s13, the shock tube 1 is depressurized and the emptying pipeline is evacuated;
after the high-pressure hydrogen in the shock tube 1 is decompressed to normal pressure, the vent valve 303 is closed, the vacuum pump 301 is opened, the vent valve 302 is opened, and the hydrogen in the vent pipeline is pumped out;
s14, checking and maintaining the shock tube 1;
the shock tube 1 is inspected, the position of leakage is confirmed, and the shock tube 1 is repaired.
As shown in fig. 3, the hydrogen leakage monitoring method of the shock tube of the high-pressure hydrogen driver of the embodiment further includes a forced pressure relief flow;
in order to avoid hydrogen leakage and corrosion to the outer layer 101, when any one of the detection instruments 202 reaches a set value or when the secondary shock tunnel test is finished, a forced pressure relief flow is started no matter whether high-pressure hydrogen leakage exists or not, and the specific steps are as follows:
s20, detecting instrument 202 reaches a set value or when the shock wave wind tunnel test is finished;
s21, evacuating hydrogen in the buffer container 201 at the leakage part;
the leak detection stop valve 203 and the vent valve 303 of the leak part are sequentially opened, and the hydrogen in the buffer container 201 of the leak part is discharged to the atmosphere;
s22, extracting hydrogen in the emptying pipeline;
closing the vent valve 303, starting the vacuum pump 301, opening the evacuation valve 302, and pumping out the hydrogen in the vent pipeline;
s23, checking the shock tube 1, and performing maintenance.
Further, the set value is less than or equal to 10MPa.
Although embodiments of the invention have been disclosed in the foregoing description and illustrated in the drawings, it will be understood by those skilled in the art that the present invention is not limited to the specific details and illustrations of features and steps set forth herein, and that all features of the invention disclosed, or steps of the method or process, except for mutually exclusive features and/or steps, may be combined in any manner without departing from the principles of the invention.
Claims (10)
1. The hydrogen leakage monitoring device of the shock tube of the high-pressure hydrogen driver is characterized by being arranged outside the shock tube (1) and comprising a leakage monitoring and collecting system (2) and a pumping and discharging system (3); a plurality of high-pressure hydrogen leakage monitoring points are arranged on the shock tube (1); the leakage monitoring and collecting system (2) is used for synchronously monitoring a plurality of high-pressure hydrogen leakage monitoring points of the shock tube (1); the pumping and discharging system (3) is used for pumping and discharging high-pressure hydrogen leaked by the shock tube (1) during shock tunnel test.
2. The hydrogen leakage monitoring device of the shock tube of the high-pressure hydrogen driver according to claim 1, wherein the shock tube (1) stores high-pressure hydrogen in a shock tunnel test, a driving section tube body and a driving section tube body end socket of the shock tube (1) adopt an inner-outer nested double-layer structure, the driving section tube body sequentially comprises a lining (102) and an outer layer (101) from inside to outside, the lining (102) is divided into a plurality of sections from front to back, the sections correspond to the lining (102), and the outer layer (101) is divided into a plurality of equal sections from front to back; the driving section pipe body end socket is sequentially provided with an inner end socket and an outer end socket from inside to outside; the inner sealing (104) is arranged on the contact end surfaces between the inner sealing head and each section of the inner lining (102), and the outer sealing (103) is arranged on the contact end surfaces between the outer sealing head and each section of the outer layer (101); a leak detection hole (105) connected to the corresponding contact end surface is provided in the outer layer (101) of each contact end surface.
3. The hydrogen leakage monitoring device of the shock tube of the high-pressure hydrogen driver according to claim 2, wherein the leakage monitoring and collecting system (2) comprises buffer containers (201) respectively connected with the leakage detection holes (105), each buffer container (201) is provided with a special connection detection instrument (202), and each buffer container (201) is gathered to the blow-down pipeline through a special leakage detection stop valve (203); the detecting instrument (202) is used for detecting the pressure and the pressure rising speed of the buffer container (201), when the detected pressure of the buffer container (201) is larger than the initial pressure of the buffer container (201), the high-pressure hydrogen in the shock tube (1) is judged to leak at the corresponding contact end face, and then the high-pressure hydrogen leakage rate is calculated through the pressure rising speed, namely the pressure rising speed.
4. A hydrogen leakage monitoring device for shock tube of high pressure hydrogen driver according to claim 3, wherein the pumping and exhausting system (3) comprises a vacuum pump (301), an evacuating valve (302) and a venting valve (303), the vacuum pump (301) and the evacuating valve (302) are sequentially connected into one path, the venting valve (303) is another path, and the two paths are connected in parallel on the interface of the venting pipeline; the pumping and discharging system (3) discharges the hydrogen in the emptying pipeline to a safe area, when the gas pressure in the emptying pipeline exceeds one atmosphere, the hydrogen is discharged through the emptying valve (303), and when the gas pressure in the emptying pipeline is lower than one atmosphere, the hydrogen is discharged through the vacuum pump (301); the vacuum pump (301) is used for evacuating the gas in the emptying pipeline, the gas comprises leaked hydrogen and residual air, the leaked hydrogen is used for reducing the corrosion of the outer layer (101) by the leaked hydrogen, and the residual air is used for avoiding the explosion caused by the mixture of the leaked hydrogen and the residual air.
5. The hydrogen leakage monitoring device for shock tube of high pressure hydrogen driver according to claim 4, wherein the pressure of the high pressure hydrogen is 10 mpa-200 mpa.
6. The hydrogen leakage monitoring device for shock tubes of high pressure hydrogen drivers according to claim 4, wherein the outer layer (101) is made of high strength alloy steel for carrying the high pressure load of the shock tube (1), and the inner liner (102) is preferably made of hydrogen resistant alloy for isolating and resisting the corrosion of high pressure hydrogen.
7. The hydrogen leakage monitoring device for shock tube of high pressure hydrogen driver according to claim 4, wherein the lining seal (104) is a main seal for preventing high pressure hydrogen of the shock tube (1) from leaking to the outer layer (101); the outer layer seal (103) is an auxiliary seal and is used for preventing high-pressure hydrogen of the shock tube (1) from leaking into the environment after the main seal fails or the lining (102) is broken.
8. The hydrogen leakage monitoring method for the shock tube of the high-pressure hydrogen driver is used for the hydrogen leakage monitoring device for the shock tube of the high-pressure hydrogen driver, and is characterized by comprising a test monitoring pressure relief flow and specifically comprising the following steps of:
s10, vacuumizing a shock tube (1) before a test;
before the test of the shock tunnel, closing an emptying valve (303), opening a vacuum pump (301), opening a leak detection stop valve (203) and an evacuating valve (302), evacuating an emptying pipeline to a set pressure, and then closing the evacuating valve (302) and the leak detection stop valve (203);
s11, filling high-pressure hydrogen into the shock tube (1) for real-time detection;
filling high-pressure hydrogen into the shock tube (1), collecting the pressure value of each detection instrument (202) in real time and calculating the average pressure rise rate in one minute in the process of boosting the shock tube (1), judging whether high-pressure hydrogen leakage exists or not according to a preset dangerous threshold value, and determining the leakage position according to the position of the detection instrument (202) where the high-pressure hydrogen leakage occurs;
s12, finding out high-pressure hydrogen leakage, and stopping filling the shock tube (1) with the high-pressure hydrogen;
if high-pressure hydrogen leakage is found, a leakage detection stop valve (203) and an emptying valve (303) of the leakage part are sequentially opened, and the hydrogen in a buffer container (201) of the leakage part is discharged to the atmosphere; simultaneously, sending alarm information to a general control system of the shock tunnel, stopping the test of the general control system of the shock tunnel, filling high-pressure hydrogen into the shock tube (1), and discharging the high-pressure hydrogen in the shock tube (1);
s13, the shock tube (1) is depressurized and the emptying pipeline is evacuated;
after the high-pressure hydrogen in the shock tube (1) is decompressed to normal pressure, a vent valve (303) is closed, a vacuum pump (301) is opened, and a vent valve (302) is opened to pump out the hydrogen in the vent pipeline;
s14, checking and maintaining the shock tube (1);
the shock tube (1) is inspected, the position of leakage is confirmed, and the shock tube (1) is maintained.
9. The method for monitoring hydrogen leakage from a shock tube of a high pressure hydrogen driver of claim 8, further comprising a forced pressure relief process;
in order to avoid hydrogen leakage and corrosion to the outer layer (101), when any one of the detection instruments (202) reaches a set value or after the secondary shock tunnel test is finished, a forced pressure relief flow is started no matter whether high-pressure hydrogen leakage exists or not, and the specific steps are as follows:
s20, enabling the detection instrument (202) to reach a set value or ending the secondary shock tunnel test;
s21, evacuating hydrogen in a buffer container (201) at the leakage part;
sequentially opening a leak detection stop valve (203) and an emptying valve (303) of the leakage part, and discharging hydrogen in a buffer container (201) of the leakage part to the atmosphere;
s22, extracting hydrogen in the emptying pipeline;
closing an emptying valve (303), starting a vacuum pump (301), opening an evacuating valve (302), opening the evacuating valve (302), and pumping out hydrogen in an emptying pipeline;
s23, checking the shock tube (1) and performing maintenance.
10. The method for monitoring hydrogen leakage of shock tube of high pressure hydrogen driver according to claim 9, wherein the set value is less than or equal to 10MPa.
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