CN212132041U - Ultrahigh pressure hydrogen generation system - Google Patents
Ultrahigh pressure hydrogen generation system Download PDFInfo
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- CN212132041U CN212132041U CN202020790995.7U CN202020790995U CN212132041U CN 212132041 U CN212132041 U CN 212132041U CN 202020790995 U CN202020790995 U CN 202020790995U CN 212132041 U CN212132041 U CN 212132041U
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
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Abstract
The utility model relates to an ultrahigh pressure hydrogen generation system, ultrahigh pressure hydrogen generation system include: the test bin comprises a bin body and an inner cavity, wherein the bin body is provided with a retaining groove at a preset position; the piston is movably arranged in the inner cavity, the piston is provided with a backstop rod matched with the backstop groove, the inner cavity is divided into a first cavity and a second cavity by taking the piston as a boundary, and the first cavity is used for carrying out an explosion reaction; the test system is arranged in such a way that during a test, an explosion reaction occurs in the first chamber, the generated ultrahigh pressure pushes the piston to move to the stopping groove of the bin body, the stopping rod of the piston is popped up to be combined with the stopping groove, and hydrogen in the second chamber is compressed to generate ultrahigh pressure hydrogen. The utility model discloses an ultrahigh pressure hydrogen generation system can obtain the superhigh pressure more than 100 MPa.
Description
Technical Field
The utility model relates to a hydrogen safety utilizes technical field, specifically relates to an ultrahigh pressure hydrogen generation system.
Background
The hydrogen storage runs through the links of hydrogen production, storage, transportation, use and the like, and is a key technology for the development of hydrogen energy and hydrogen fuel cell vehicles. The existing hydrogen storage technologies mainly include high-pressure hydrogen storage, liquid hydrogen storage, metal oxide hydrogen storage, carbon-based material hydrogen storage, chemical hydrogen storage and the like. From the viewpoint of energy utilization, high-pressure hydrogen storage is the most preferable choice. However, the safety problem caused by high-pressure hydrogen storage is the biggest obstacle to the application of the hydrogen storage, and once the high-pressure hydrogen is accidentally leaked, accidents such as fire and explosion are likely to be caused, and huge casualties and property loss are caused.
Spontaneous ignition can also occur from high pressure hydrogen leakage without any external ignition source, which in turn initiates jet fire behavior and even cloud explosion. At present, the mechanism of the spontaneous combustion caused by the leakage of the high-pressure hydrogen is not uniformly known at home and abroad, and a systematic scientific experiment needs to be developed to research the critical condition and the essential mechanism of the spontaneous combustion.
The high-pressure hydrogen leakage test is carried out by firstly equipping with a high-pressure hydrogen generator. The common highest storage pressure of hydrogen cylinders for laboratories is 12 MPa; hydrogen compressors, up to 20-30MPa, have the disadvantages of large size and high energy consumption. At present, the maximum pressure of a hydrogen storage tank on a hydrogen energy power automobile reaches 70MPa, and the storage pressure in industry is higher. In order to develop an experimental simulation closer to the actual working condition, a new high-pressure or even ultrahigh-pressure hydrogen generation system needs to be designed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main objective is exactly to the problem that exists above, provides an ultrahigh pressure hydrogen generation system.
In order to realize the above purpose, the utility model discloses a super high pressure hydrogen generating system's technical scheme as follows:
the ultrahigh pressure hydrogen generation system comprises:
the test bin comprises a bin body and an inner cavity, wherein the bin body is provided with a retaining groove at a preset position;
the piston is movably arranged in the inner cavity, the piston is provided with a backstop rod matched with the backstop groove, the inner cavity is divided into a first cavity and a second cavity by taking the piston as a boundary, and the first cavity is used for carrying out an explosion reaction;
the test system is arranged in such a way that during a test, an explosion reaction occurs in the first chamber, ultrahigh pressure is generated to push the piston to move to the stopping groove of the bin body, the stopping rod of the piston is popped up to be combined with the stopping groove, and hydrogen in the second chamber is compressed to generate ultrahigh pressure hydrogen.
Preferably, the first chamber and the second chamber are both provided with a gas distribution device for supplying gas, and the gas distribution device comprises at least one gas source, a vent hole arranged on the bin body, a vent pipeline connecting the gas source with the vent hole, and a pressure gauge arranged on the vent pipeline.
Preferably, the gas distribution device of the first chamber comprises a combustible gas source, an oxygen gas source and a gas tightness detection gas source, and the gas distribution device of the second chamber comprises a combustible gas source and a gas tightness detection gas source.
Preferably, the ultrahigh pressure hydrogen generation system comprises a vacuum-pumping device for vacuumizing the inner cavity before the test, wherein the vacuum-pumping device comprises a vacuum pump and a vacuum gauge.
Preferably, the evacuation device includes an evacuation line for connecting the vent line of the gas distribution device of the first chamber and the vent line of the gas distribution device of the second chamber, and the vacuum pump and the vacuum gauge are disposed in the evacuation line.
Preferably, both ends of the piston are provided with first sealing rings for keeping the air tightness between the first chamber and the second chamber.
Preferably, the right end of the test chamber is provided with a first opening, and the first opening is provided with a rupture disk, a joint with a valve or a downstream pipeline.
Preferably, a flange structure is arranged at the left end part of the test bin and used for adjusting the length of the bin body.
Preferably, the first chamber is provided with an ignition electrode connected with an ignition device, and the ignition electrode is hermetically connected with the bin body.
Preferably, the first chamber and the second chamber are both provided with pressure sensors for detecting pressure changes at two sides of the piston in the explosion process and the compression process.
Preferably, a second sealing ring is arranged in the retaining groove.
Preferably, the test chamber is provided with an interlayer for introducing circulating liquid to control the temperature of the test chamber.
Preferably, a second opening is formed in the bin body corresponding to the stopping groove, a sealing plug is arranged in the second opening, and the sealing plug is detachably arranged on the sealing plug, so that the sealing plug is removed after the test is finished, the stopping rod is pressed back to the piston, and the stopping rod is separated from the stopping groove; preferably, the sealing plug and the test chamber are fixed through bolts.
The utility model also provides a preparation method of superhigh pressure hydrogen, including following step:
s0, connecting each system component in sequence according to the structure of the system, and building a test device;
s1, opening a nitrogen control valve and a main valve, closing other valves, filling nitrogen into the inner cavity of the test chamber until the pressure exceeds 1 atmosphere, closing the nitrogen control valve, and checking the air tightness of the whole device;
s2, after the air tightness is determined to be good, opening the on-off valve, and starting a vacuum pump to vacuumize;
s3, after vacuumizing, closing the on-off valve and the vacuum pump, and starting the data acquisition instrument to prepare for recording the pressure value change;
s4, opening an oxygen control valve, a hydrogen control valve and an on-off valve, filling a certain amount of hydrogen-oxygen mixed gas into the first chamber and filling hydrogen with the same pressure into the second chamber according to the initial pressure and the proportioning requirement, keeping the position of the piston and closing all valves;
s5, starting an ignition device, igniting the hydrogen-oxygen mixture, suddenly increasing the pressure of the first chamber, and pushing the piston to move rightwards;
and S6, recording the pressure changes of the first chamber and the second chamber in the motion process of the piston, and determining the maximum pressure reached in the second chamber on the right side of the piston after the piston stops.
The utility model discloses an ultrahigh pressure hydrogen generating system can obtain the ultrahigh pressure more than 100MPa, and can change the condition and obtain the ultrahigh pressure hydrogen of different pressures, if change the initial pressure that fills into oxyhydrogen proportion, blasting reaction medium, test storehouse inside, the draw ratio in test storehouse, piston initial position etc..
Drawings
Fig. 1 is the structural schematic diagram of the ultrahigh pressure hydrogen generation system provided by the present invention.
Fig. 2 is an enlarged view of the stopping and withdrawing device of the ultra-high pressure hydrogen generating system.
Reference numerals
1. 2, 3, 4, 5 control valve
6. 7, 10, 11 on-off valve
8 vacuum meter
9 vacuum pump
12. 13 pressure gauge
14. 15 main valve
16. 17 ignition electrode
18 ignition device
19 piston
20 test chamber
21 first opening hole
22. 23 pressure sensor
24 data acquisition instrument
25 flange structure
26 interlayer
27. 28 outlet for cooling liquid
29. 30 inlet for cooling liquid
31. 32 retaining groove
33. 34 sealing plug
35. 36 stopping rod
37 spring
38 guide ring
39 anti-back ring
40. 41 first seal ring
42 second seal ring
Detailed Description
In order to clearly understand the technical contents of the present invention, the following embodiments are specifically illustrated in detail.
As shown in fig. 1-2, for the utility model provides an ultrahigh pressure hydrogen generation system's embodiment, wherein, ultrahigh pressure hydrogen generation system include: the test bin 20 comprises a bin body and an inner cavity, wherein the bin body is provided with retaining grooves 31 and 32 at preset positions, second openings are formed in the bin body at positions corresponding to the retaining grooves 31 and 32, and the second openings are provided with detachable sealing plugs 33 and 34 to realize sealing; the piston 19 is movably arranged in the inner cavity, the piston 19 is provided with backstop rods 35 and 36 matched with the backstop grooves 31 and 32, the inner cavity is divided into a first chamber and a second chamber by taking the piston 19 as a boundary, and the first chamber is used for carrying out an explosion reaction; the test system is arranged in such a way that during a test, an explosion reaction occurs in the first chamber, ultrahigh pressure is generated to push the piston 19 to move to the stopping grooves 31 and 32 of the bin body, the stopping rods 35 and 36 of the piston 19 are popped out to be combined with the stopping grooves 31 and 32, and hydrogen in the second chamber is compressed to generate ultrahigh pressure hydrogen;
after the test is finished, the sealing plug at the second opening of the bin body is removed, so that the stop rods 35 and 36 can be pressed back to the piston 19, the stop rods 35 and 36 are separated from the stop grooves, and the piston 19 can conveniently recover to move freely.
As shown in fig. 1, the first chamber and the second chamber are provided with gas distribution devices for supplying gas, and the gas distribution devices are used for continuously and stably filling gas into the chambers, and simultaneously, the air tightness of the device can be checked before the test. The air distribution device comprises at least one air source, an air vent arranged on the bin body, a vent pipeline connecting the air source and the air vent, and pressure gauges 12 and 13 arranged on the vent pipeline.
The gas distribution device of the first chamber comprises a hydrogen gas source, an oxygen gas source and a gas tightness detection gas source, and control valves 1, 2 and 3 and a main valve 14 are correspondingly arranged to control the gas sources; the gas distribution device of the second chamber comprises a hydrogen gas source and a gas tightness detection gas source, and control valves 4 and 5 and a main valve 15 are correspondingly arranged to control the gas source. Because the system of the utility model relates to ultrahigh pressure and combustible gas, the whole system needs to keep good air tightness, therefore, an air tightness detection air source is arranged, the air tightness detection of the system is carried out before the test, and the air tightness detection air source can adopt nitrogen;
the pressure gauges 12 and 13 arranged on the vent pipeline are correspondingly provided with on-off valves 10 and 11, the pressure gauges are used for monitoring pressure change in a test bin in the gas distribution process, the pressure gauges are provided with the on-off valves, and the on-off valves are closed before the explosion reaction to protect the pressure gauges;
the gas source can use a high-pressure gas cylinder, a gas compressor or liquefied gas, and can also be other high-pressure gas supply systems.
As shown in fig. 1, the ultrahigh pressure hydrogen generation system includes a vacuum pumping device for vacuumizing the inner cavity before the test, the vacuum pumping device includes a vacuum pumping pipeline for connecting the vent pipeline of the gas distribution device of the first chamber and the vent pipeline of the gas distribution device of the second chamber, the vacuum pump 9 and the vacuum gauge 8 are disposed on the vacuum pumping pipeline, and the vacuum pumping pipeline is respectively provided with an on-off valve 6 and an on-off valve 7. Wherein, the vacuum meter 8 is used for displaying the vacuum degree, and the on-off valve is used for controlling the flow.
As shown in fig. 2, first sealing rings 40 and 41 are provided at both ends of the piston 19 for maintaining airtightness between the first chamber and the second chamber.
As shown in fig. 1-2, a first opening 21 is formed in the bin body close to the end of the second chamber, namely, the right end of the bin body, the first opening 21 is used for installing a rupture disk, the rupture disk can bear certain pressure, and when the piston stops due to the stopping action, the hydrogen pressure in the second chamber reaches the limit pressure of the rupture disk, and the rupture disk ruptures; or, a joint with a valve is arranged for storing the ultrahigh pressure hydrogen; alternatively, downstream piping is installed for leak testing.
As shown in fig. 1, a flange structure 25 is provided at the end of the cartridge body close to the first chamber, i.e. at the left end of the cartridge body, for adjusting the length of the cartridge body. The length of the bin body can be adjusted according to the requirement of the gas compression ratio.
As shown in fig. 1, the first chamber is provided with ignition electrodes 16 and 17 connected with an ignition device 18, and the ignition electrodes 16 and 17 are hermetically connected with the bin body. Ignition electrodes 16, 17 may be arranged on the upper and lower left side of the test chamber. The ignition device controls the ignition electrode to ignite combustible media, such as oxyhydrogen mixture, so as to generate explosion overpressure.
As shown in FIG. 1, the first chamber and the second chamber are provided with pressure sensors 22 and 23, the pressure sensors 22 and 23 are connected with a data acquisition instrument 24 through leads, and the pressure sensors 22 and 23 can be arranged on the upper wall surface of the test chamber. Through the pressure sensors 22 and 23, the data acquisition instrument 24 can monitor the pressure changes on the left side and the right side of the piston in the burning and explosion process and the compression process.
As shown in fig. 1, the test chamber 20 has an interlayer 26, and the interlayer 26 is provided with cooling liquid outlets 27 and 28 and cooling liquid inlets 29 and 30 for introducing a circulating liquid to control the temperature of the test chamber 20. To facilitate the separate control of the temperature in the chambers on either side of the retaining groove, the interlayer 26 is divided into left and right portions with the retaining groove as a boundary.
As shown in fig. 2, the piston 19 includes a spring 37, a retaining rod 35 connected to the spring 37, a guide ring 38 disposed around the retaining rod 35, and a retaining ring 39, and a second sealing ring 42 is disposed in the retaining grooves 31 and 32 for sealing.
When using the utility model discloses an ultrahigh pressure hydrogen generating system to hydrogen and oxygen are the combustible medium of detonation reaction as the example, and the concrete implementation step is as follows:
(1) according to the structure, all system components are connected in sequence, and a test device is built;
(2) opening a nitrogen control valve and a main valve, closing other valves, filling nitrogen into the inner cavity of the test chamber until the pressure exceeds 1 atmosphere, closing the nitrogen control valve, and checking the air tightness of the whole device;
(3) after the air tightness is determined to be good, opening the on-off valve, and starting a vacuum pump to vacuumize;
(4) after vacuumizing, closing the on-off valve and the vacuum pump, and starting the data acquisition instrument to prepare for recording the pressure value change;
(5) opening an oxygen control valve, a hydrogen control valve and an on-off valve, filling a certain amount of hydrogen-oxygen mixed gas into the first chamber according to the stoichiometric ratio, filling hydrogen with the same pressure into the second chamber, keeping the position of the piston, and closing all valves;
(6) starting an ignition device, igniting the hydrogen-oxygen mixed gas, suddenly increasing the pressure of the first chamber, and pushing the piston to move rightwards;
(7) the pressure changes of the first chamber and the second chamber during the movement of the piston are recorded. The maximum pressure reached in the second chamber to the right of the piston after the piston has stopped is determined.
The utility model discloses a super high pressure hydrogen generation system calculates according to explosion dynamics, in step (5), if fill into 10MPa oxyhydrogen gas mixture, after igniting the gas mixture in step (6), the pressure in the first chamber can theoretically be highest shock rise to 110.6MPa (more than 10 times of initial pressure), is greater than piston right side pressure far away, therefore can promote the piston and move right in experimental storehouse. When the piston moves to the stopping groove, the stopping rod is ejected out, the piston stops moving, and ultrahigh pressure hydrogen is obtained on the right side of the piston.
Before the combustion and explosion reaction, the left side and the right side of the piston in the test chamber are filled with isobaric test gas, so that the stability of the piston can be ensured. Initial volume at right side is V1Initial pressure of P1. The interlayer is filled with circulating cooling liquid, the right side of the piston is guaranteed to be in an isothermal process, and according to an ideal gas state equation, the right side gas meets the following conditions:
PV ═ const … … (1)
When the piston stops moving, the volume of the right side is V2Final pressure of P2. The right side final pressure can be obtained in conjunction with equation (1):
by using the formulas (1) and (2), the compression ratio (V) of the hydrogen gas on the right side of the piston can be calculated through the movement distance of the piston from the initial position to the retaining groove1/V2) And determining the final pressure of the compressed hydrogen.
Therefore, through changing initial conditions, like the initial pressure of the inside oxyhydrogen proportion of filling, the explosion reaction medium, experimental storehouse, the draw ratio of experimental storehouse, the initial position of piston etc, the utility model discloses an ultrahigh pressure hydrogen generating system can obtain the ultrahigh pressure hydrogen more than 100 MPa.
Specifically, the pressure values of the hydrogen-oxygen mixed gas with different equivalence ratios generated after combustion and explosion are different, and the hydrogen-oxygen mixed gas is mixed according to the proportion in accordance with the stoichiometric ratio to obtain the maximum pressure; the medium of the explosion reaction can be changed, and besides the hydrogen-oxygen mixed gas, other combustible media, such as hydrogen-nitrous oxide, acetylene-oxygen, acetylene-nitrous oxide and the like, can be adopted to obtain different maximum explosion pressures; the initial pressure value of the hydrogen on the right side of the piston in the high-pressure test bin influences the test, and under the condition of the same compression ratio, the higher the initial pressure on the right side of the piston is, the higher the final pressure is; the detonation of the combustible medium can be realized by changing the length-diameter ratio of the pipeline or the initial length of the first chamber or improving the ignition energy, so that extremely high detonation pressure (about 20 times of the initial pressure for the hydrogen-oxygen mixture with the stoichiometric ratio) is obtained; varying the initial position of the piston can produce different compression ratios.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (13)
1. An ultrahigh pressure hydrogen generation system, characterized in that the ultrahigh pressure hydrogen generation system comprises:
the test bin comprises a bin body and an inner cavity, wherein the bin body is provided with a retaining groove at a preset position;
the piston is movably arranged in the inner cavity, the piston is provided with a backstop rod matched with the backstop groove, the inner cavity is divided into a first cavity and a second cavity by taking the piston as a boundary, and the first cavity is used for carrying out an explosion reaction;
the ultrahigh pressure hydrogen generation system is arranged in such a way that when a test is carried out, an explosion reaction occurs in the first chamber, the generated ultrahigh pressure pushes the piston to move to the stopping groove of the bin body, the stopping rod of the piston is popped up to be combined with the stopping groove, and hydrogen in the second chamber is compressed to generate ultrahigh pressure hydrogen.
2. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein each of the first chamber and the second chamber is provided with a gas distribution device for supplying gas, and the gas distribution device comprises at least one gas source, a vent hole arranged in the cartridge body, a vent line connecting the gas source and the vent hole, and a pressure gauge arranged in the vent line.
3. An ultrahigh-pressure hydrogen generation system according to claim 2 wherein the gas distribution means of the first chamber comprises a combustible gas source, an oxygen gas source and a gas tightness detection gas source, and the gas distribution means of the second chamber comprises a combustible gas source and a gas tightness detection gas source.
4. An ultrahigh-pressure hydrogen generation system according to claim 2, wherein the ultrahigh-pressure hydrogen generation system comprises a vacuum evacuation device for evacuating the inner chamber before testing, the vacuum evacuation device comprising a vacuum pump and a vacuum gauge.
5. An ultrahigh-pressure hydrogen generation system according to claim 4, wherein the evacuation device comprises an evacuation line for connecting the vent line of the gas distribution device of the first chamber and the vent line of the gas distribution device of the second chamber, and the vacuum pump and the vacuum gauge are disposed in the evacuation line.
6. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein the piston is provided at both ends with first seal rings for maintaining airtightness between the first chamber and the second chamber.
7. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein the right end of the test chamber is provided with a first opening, and the first opening is provided with a rupture disk, a joint with a valve or a downstream pipeline.
8. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein a flange structure is provided at the left end of the test chamber for adjusting the length of the chamber body.
9. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein the first chamber is provided with an ignition electrode connected with an ignition device, and the ignition electrode is hermetically connected with the cartridge body.
10. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein the first chamber and the second chamber are each provided with a pressure sensor for detecting pressure changes on both sides of the piston during the explosion process and the compression process.
11. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein a second seal ring is provided in the retaining groove.
12. An ultra-high pressure hydrogen generation system according to claim 1, wherein the test chamber has an interlayer for introducing a circulating fluid to control the temperature of the test chamber.
13. An ultrahigh-pressure hydrogen generation system according to claim 1, wherein a second opening is formed in the cartridge body at a position corresponding to the retaining groove, and a detachable sealing plug is arranged in the second opening, so that the sealing plug is removed after the test is finished, the retaining rod is pressed back to the piston, and the retaining rod is separated from the retaining groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020790995.7U CN212132041U (en) | 2020-05-13 | 2020-05-13 | Ultrahigh pressure hydrogen generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020790995.7U CN212132041U (en) | 2020-05-13 | 2020-05-13 | Ultrahigh pressure hydrogen generation system |
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| Publication Number | Publication Date |
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| CN212132041U true CN212132041U (en) | 2020-12-11 |
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| CN202020790995.7U Active CN212132041U (en) | 2020-05-13 | 2020-05-13 | Ultrahigh pressure hydrogen generation system |
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| CN (1) | CN212132041U (en) |
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