CN114517888A - Station hydrogen storage cylinder and gas cylinder group based on self-reinforcing theory - Google Patents
Station hydrogen storage cylinder and gas cylinder group based on self-reinforcing theory Download PDFInfo
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- CN114517888A CN114517888A CN202210232407.1A CN202210232407A CN114517888A CN 114517888 A CN114517888 A CN 114517888A CN 202210232407 A CN202210232407 A CN 202210232407A CN 114517888 A CN114517888 A CN 114517888A
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- 238000003860 storage Methods 0.000 title claims abstract description 57
- 239000007789 gas Substances 0.000 title claims abstract description 54
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 47
- 239000001257 hydrogen Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000005728 strengthening Methods 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/08—Mounting arrangements for vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
- F17C2201/0114—Shape cylindrical with interiorly curved end-piece
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/01—Reinforcing or suspension means
- F17C2203/011—Reinforcing means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/01—Mounting arrangements
- F17C2205/0103—Exterior arrangements
- F17C2205/0107—Frames
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/01—Mounting arrangements
- F17C2205/0123—Mounting arrangements characterised by number of vessels
- F17C2205/013—Two or more vessels
- F17C2205/0134—Two or more vessels characterised by the presence of fluid connection between vessels
- F17C2205/0142—Two or more vessels characterised by the presence of fluid connection between vessels bundled in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/01—Mounting arrangements
- F17C2205/0153—Details of mounting arrangements
- F17C2205/0192—Details of mounting arrangements with external bearing means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0382—Constructional details of valves, regulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0388—Arrangement of valves, regulators, filters
- F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a station hydrogen storage cylinder based on a self-reinforcing theory, which comprises a cylinder opening valve and a cylinder body, wherein the cylinder opening valve comprises a wrench, a valve body, a cock, a first screw cap and a second screw cap, the wrench is connected with the upper end of the cock, the lower part of the cock is arranged in the valve body and is connected through a pressing sleeve, the first screw cap is arranged on the outer side of the pressing sleeve, the lower end part of the valve body is connected with the cylinder body through the second screw cap, and the cylinder body is processed through a self-reinforcing process. The invention also discloses a gas storage cylinder group formed by combining the hydrogen storage cylinders. By the scheme of the invention, the bonding strength and the sealing property between the bottle mouth valve and the bottle body are improved, in addition, the bottle body is subjected to self-reinforcing process treatment, and the pressure is relieved by applying 1.5-1.6 times of design pressure, so that the overall stress level of the gas cylinder is reduced, and the service life of the hydrogen storage gas cylinder is prolonged. In addition, the gas storage cylinder group is formed by mutually connecting side interfaces at two ends of the valve body between different gas cylinders and is fixed through the alloy bracket, so that the gas storage cylinder group is combined and operated and is easy to bury underground for use.
Description
Technical Field
The invention belongs to the technical field of hydrogen storage cylinders, and particularly relates to a station hydrogen storage cylinder and a gas storage cylinder group based on a self-enhancement theory.
Background
Hydrogen energy is a secondary clean energy with high energy density and no pollution, and the application thereof will occupy an important position in the development of economic technology in the future. And, in recent years, with the development of new energy vehicles, the number of hydrogen refueling stations has been increasing as an infrastructure for supplying hydrogen gas to fuel cell vehicles. The hydrogen energy full industry chain comprises three key links of hydrogen production, hydrogen storage and transportation and hydrogen energy utilization. In the aspect of hydrogen energy development, the most important challenge in China is hydrogen energy storage and transportation. At present, 4 hydrogen storage technologies of high-pressure liquid hydrogen storage, low-temperature liquid hydrogen storage, organic liquid hydrogen storage and solid material hydrogen storage are mainly used in China, wherein the high-pressure gaseous hydrogen storage technology is the most mature, but the bottleneck exists in the aspect of hydrogen storage safety. In order to stabilize the storage capacity of the existing hydrogen and improve the safety of the hydrogen storage cylinder, ultrahigh pressure vessel equipment is widely applied to the chemical industry and the petroleum industry. For a thick-wall gas cylinder, the stress distribution is extremely uneven due to the complex wall thickness and shape, the stress of the inner wall is far higher than that of the outer wall, and the thick-wall gas cylinder is easy to enter a yield stage; in addition, because the size of the blank material is large, defects which are difficult to detect are often generated in the casting, forging and heat treatment, and the hidden danger of fatigue fracture damage is caused. The existing hydrogen storage for stations is generally below 60MPa, the thickness of the steel cylinder is large, and the manufacturing difficulty is large. 100MPa is a development trend, larger thickness is needed, and spinning forming is more difficult. Therefore, how to effectively reduce the operation cost, reduce the process difficulty and prolong the fatigue life of the equipment has become a problem to be solved in the engineering.
Disclosure of Invention
In order to solve the problems, the invention provides a station hydrogen storage cylinder and a gas cylinder group based on a self-reinforcing theory, which solve the technical problems of high cost, high preparation process difficulty, reduced fatigue life and the like caused by large thickness of a steel cylinder in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a stand and use hydrogen storage cylinder based on from reinforcing theory, includes bottleneck valve module and bottle, bottleneck valve module includes spanner, valve body, cock, first spiral shell lid, second spiral shell lid, the spanner is connected with the upper end of cock, and the lower part of cock is arranged in inside the valve body and is carried out fixed connection through the pressure cover, and the pressure cover outside is provided with first spiral shell lid, and first spiral shell lid is connected with the upper end of valve body for control cock and pressure cover complex elasticity degree, the lower tip of valve body is connected with the bottle through the second spiral shell lid.
As a further technical scheme, the cock includes integrated into one piece's last cock portion and lower cock portion, and the diameter of going up the cock portion is less than lower cock portion, and the upper end of going up the cock portion is provided with joint portion for form the joint with the spanner, and lower cock portion is provided with the through-hole that runs through, and the through-hole position is hollow cylinder structure to the cock bottom.
As further technical scheme, the pressure cover is hollow cylinder structure, and the cover is established in the outside of last cock portion, presses the external diameter phase-match of cover internal diameter and last cock portion, presses the cover upper end to be provided with annular flange, annular flange joint is at the top edge department of valve body.
As a further technical scheme, the valve body is of a cross-shaped communication structure, the left side and the right side of the valve body are provided with communicated side connectors, the side connectors are used for being connected with other gas cylinders or other equipment, a containing cavity used for containing a cock is arranged inside the valve body, and the size of the containing cavity is matched with the cock.
As a further technical scheme, the upper end part and the lower end part of the valve body are provided with external threads, the second screw cap is sleeved on the outer side of the lower end part of the valve body, and the second screw cap is provided with internal threads.
As a further technical scheme, the inner side and the outer side of the bottle mouth of the bottle body are respectively provided with a bottle mouth internal thread and a bottle mouth external thread, the bottle mouth internal thread corresponds to the external thread at the lower end part of the valve body, and the bottle mouth external thread corresponds to the internal thread of the second screw cap.
As a further technical scheme, a sealing groove is formed in the lower portion of the inner thread of the bottle opening and filled with a rubber ring, and the tail end of the lower end portion of the valve body is tightly sealed with the rubber ring.
As a further technical scheme, the bottle body is treated by a self-reinforcing process, and the specific process comprises the following steps:
(1) through plastic collapse and elastic-plastic finite element analysis, the diameter ratio k is approximately equal to 1.4, the self-reinforcing pressure range is determined through finite element analysis software, the maximum self-reinforcing pressure is checked, and the plastic deformation exceeding 2 percent is avoided; calculating different self-intensification pressures PaCorresponding elasto-plastic interface diameter DPSimultaneously calculating the circumferential residual stress under respective enhanced pressure, and avoiding the occurrence of the Bauschinger effect through finite element analysis; fitting the hoop stress to obtain a stress distribution coefficient AiThe device is used for calculating a stress intensity factor, finally carrying out fatigue check according to a pair formula, and calculating allowable cycle times, wherein the result shows that when the self-reinforcing pressure is 1.5-1.6 times of the test pressure, the larger the stress ratio is, the maximum fatigue life of the gas cylinder is;
(2) adding 1.5-1.6 times of test pressure into the bottle body to make the inner wall of the bottle body locally yield and the outer wall still keep elasticity;
(3) and (5) releasing pressure, finishing the self-reinforcing process, and introducing working pressure for normal use.
The invention also provides a gas storage cylinder group formed by combining the station hydrogen storage cylinders based on the self-enhancement theory, wherein the hydrogen storage cylinders are connected with side interfaces at two sides of a valve body of the hydrogen storage cylinder through gas transmission pipelines.
As a further technical scheme, the gas storage cylinder group is further provided with a flow meter and a control valve, an alloy support is arranged on the side face of the gas storage cylinder group and fixed through the alloy support, and a base is further arranged at the bottom of the gas storage cylinder group.
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
1) in the invention, the bottle mouth valve component and the bottle body are connected and fixed through a double-thread structure, so that a double-fixing function is realized, and the bottle mouth valve component and the bottle body are prevented from being separated;
2) in the invention, the bottle mouth valve can realize the inlet and outlet of gas by rotating the wrench and is connected with other devices through side interfaces at two ends of the valve body; the alloy support realizes the combined operation of the gas storage cylinder group and is easy to bury underground for use;
3) in the invention, the three sealing grooves are arranged at the bottle mouth of the bottle body, so that the sealing performance of the structure is further improved;
4) in the invention, the service life of the gas cylinder is prolonged to the maximum extent by carrying out self-reinforcing treatment on the cylinder body, applying 1.5 times of design pressure and then releasing the pressure;
5) according to the invention, through the self-reinforcing treatment process, the operation cost can be effectively reduced, the thickness of the gas cylinder can be reduced, and the difficulty of the spinning process can be reduced.
Drawings
FIG. 1 is a schematic view of the construction of a hydrogen storage cylinder for a station of the present invention;
FIG. 2 is a partial cross-sectional view of a finish valve assembly and a finish of the present invention;
FIG. 3 is a schematic view of the faucet structure of the present invention;
FIG. 4 is a schematic view of the press sleeve structure of the present invention;
FIG. 5 is a sectional view of the valve body structure of the present invention;
FIG. 6 is a detailed view of the structure of the bottle mouth of the bottle body of the present invention;
FIG. 7 is a front view of the construction of the station cylinder set of the present invention;
FIG. 8 is a right side elevational view of the station cylinder assembly configuration of the present invention;
FIG. 9 is a schematic view of the self-reinforcing principle of the bottle body of the present invention;
FIG. 10 is a flow chart of the preferred self-enhancement process of the present invention;
FIG. 11 is a schematic diagram showing the fatigue life of the cylinder after the self-reinforcing treatment of the cylinder according to the present invention (stress ratio is 0);
FIG. 12 is a schematic diagram of the fatigue life improvement of the cylinder after the self-reinforcing treatment of the cylinder according to the present invention (stress ratio is 0.56);
FIG. 13 is a schematic diagram showing the fatigue life of the cylinder after the self-reinforcing treatment of the cylinder according to the present invention (stress ratio is 0.7);
in the figure: 1. a bottle mouth valve assembly; 11. a wrench; 12. a valve body; 121. a side interface; 122. a cavity; 13. a cock; 131. an upper plug portion; 132. a lower plug portion; 133. a clamping part; 134. a through hole; 14. a first screw cap; 15. a second screw cap; 16. pressing the sleeve; 161. an annular flange; 2. a bottle body; 21. a bottle mouth; 211. bottle mouth internal thread; 212. external threads on the bottle mouth; 213. a sealing groove; 3. a gas storage cylinder group; 31. a flow meter; 32. a control valve; 33. an alloy support; 34. a base.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 and 2, the stand-use hydrogen storage cylinder based on the self-strengthening theory comprises a cylinder mouth valve assembly 1 and a cylinder body 2, wherein the cylinder mouth valve assembly 1 comprises a wrench 11, a valve body 12, a cock 13, a first screw cap 14 and a second screw cap 15, the wrench 11 is connected with the upper end of the cock 13, the lower part of the cock 13 is arranged in the valve body 12 and is fixedly connected through a pressing sleeve 16, the first screw cap 14 is arranged outside the pressing sleeve 16, the first screw cap 14 is connected with the upper end of the valve body 12 and is used for controlling the matching tightness degree of the cock 13 and the pressing sleeve 16, the lower end of the valve body 12 is connected with the cylinder body 2 through the second screw cap 15, and the cylinder body 2 is treated through the self-strengthening process. The bottle body 2 is a metal gas bottle and is formed in one step through a spinning process.
As shown in fig. 2-4, the cock 13 of the present invention includes an upper plug portion 131 and a lower plug portion 132 which are integrally formed, the upper plug portion 131 has a smaller diameter than the lower plug portion 132, the upper end of the upper plug portion 131 is provided with a clamping portion 133 for clamping with the wrench 11, the lower plug portion 132 is provided with a through hole 134, and the through hole 134 is located at a position of a hollow cylinder structure from the bottom end of the cock. The pressure sleeve 16 is a hollow cylindrical structure, is sleeved on the outer side of the upper plug portion 131, the inner diameter of the pressure sleeve 16 is matched with the outer diameter of the upper plug portion 131, an annular flange 161 is arranged at the upper end of the pressure sleeve 16, the annular flange 161 is clamped at the upper edge of the valve body 12, and the lower edge of the pressure sleeve 16 is in contact with the lower plug portion 132.
Referring to fig. 5, the valve body 12 of the present invention is a cross-shaped communication structure, the left and right sides of the valve body 12 are provided with communicated side interfaces 121, the side interfaces 121 can be connected with other gas cylinders or devices through threads or bolts, a cavity 122 for accommodating the cock 13 is provided inside the valve body 12, and the size of the cavity 122 matches with the cock 13.
The upper end part and the lower end part of the valve body 12 are provided with external threads, the second screw cap 15 is sleeved at the outer side of the lower end part of the valve body 12, and the second screw cap 15 is provided with internal threads.
As shown in fig. 6, a bottle mouth internal thread 211 and a bottle mouth external thread 212 are respectively arranged on the inner side and the outer side of the bottle mouth 21 of the bottle body 2 of the present invention, the bottle mouth internal thread 211 corresponds to the external thread on the lower end of the valve body 12, and the bottle mouth external thread 212 corresponds to the internal thread of the second screw cap 15. When the bottle mouth valve component 1 is connected with the bottle body 2, on one hand, the external thread at the lower end part of the valve body 12 is connected with the internal thread 211 of the bottle mouth, on the other hand, the internal thread of the second screw cap 15 is in threaded connection with the external thread 212 of the bottle mouth, and the double thread sealing structure plays a role in double fixing and ensures that the bottle mouth valve component 1 and the bottle body 2 cannot be separated.
The lower part of the bottle mouth internal thread 211 is provided with a sealing groove 213, the sealing groove 213 has three layers and is filled with a rubber ring, and the tail end of the lower end part of the valve body 12 is tightly sealed with the rubber ring.
As shown in fig. 7 and 8, a station gas cylinder set is formed by combining the station hydrogen storage cylinders based on the self-reinforcing theory, and the hydrogen storage cylinders are connected with side interfaces 121 on two sides of a hydrogen storage cylinder valve body 12 through gas transmission pipelines. The rotation of the cock 13 is controlled by rotating the wrench 11, thereby controlling the gas in and out of the bottle. The gas transmission pipeline is used for gas to flow between the gas storage cylinder groups.
The gas storage cylinder group 3 is further provided with a flow meter 31 and a control valve 32, the gas inlet and outlet are controlled through the control valve 32, the gas inlet and outlet amount is controlled through the flow meter 31, an alloy support 33 is arranged on the side face of the gas storage cylinder group 3 and fixed through the alloy support 33, and a base 34 is arranged at the bottom of the gas storage cylinder group 3. The gas storage cylinder group 3 is fixedly buried underground through an alloy bracket 33. The bottom of the gas storage cylinder group 3 is arranged to be ladder-shaped, only the bottom of the gas cylinder is an entity, and other parts are of hollow structures, so that the gas storage cylinder group is convenient to be better fixed when buried underground.
The invention creatively applies the self-enhancement theory to the hydrogen storage cylinder enhancement process, and improves the service life of the steel cylinder through the self-enhancement process.
The self-strengthening principle is shown in fig. 9, through plastic collapse and elastic-plastic finite element analysis, the ratio k is approximately equal to 1.4, the self-strengthening pressure range is determined through finite element analysis software (the minimum self-strengthening pressure enables the inner wall of the gas cylinder to reach the yield strength, the maximum self-strengthening pressure enables the gas cylinder to be completely yielded), and the maximum self-strengthening pressure is checked to avoid plastic deformation exceeding 2%. Calculating different self-reinforcing pressures P according to GB/T34019-2017 aCorresponding elasto-plastic interface diameter DPAnd simultaneously calculating the circumferential residual stress under respective enhanced pressure, and avoiding the occurrence of the Bauschinger (secondary yield) effect through finite element analysis. Fitting the annular stress (annular residual stress) to obtain a corresponding stress distribution coefficient AiAnd the method is used for calculating a stress intensity factor, and finally performing fatigue checking according to a pair formula to calculate allowable cycle times. The optimal self-reinforcing pressure is determined by comparing the calculation results of the self-reinforcing considered case and the self-reinforcing not considered case and combining the actual conditions (considering the process conditions and the potential safety hazard). A specific preferred self-enhanced process flow diagram is shown in fig. 10.
Fig. 11 to 13 are a-N curves of the calculated results, where fig. 11 shows that when the stress ratio is 0, fig. 12 shows that when the stress ratio is 0.56, fig. 13 shows that when the stress ratio is 0.7, the larger N, i.e., the larger fatigue life, the larger the self-strengthening lifting effect, and the results show that when the self-strengthening pressure is 1.5 to 1.6 times the test pressure, the larger the stress ratio, the larger the fatigue life of the gas cylinder.
And adding 1.5-1.6 times of test pressure into the bottle body 2 to ensure that the inner wall of the bottle body is locally yielded and the outer wall still keeps elasticity. And then pressure relief is carried out, the self-reinforcing process is completed, and the working pressure is introduced for normal use. (the test pressure is generally 1.15 to 1.25 times the working pressure, which is generally 90 to 100MPa)
After the bottle body 2 is subjected to self-reinforcing treatment, the plastic area of the inner wall is extruded by the elastic area of the outer wall to generate residual compressive stress, and correspondingly, the outer wall generates residual tensile stress. And the residual compressive stress generated by the working pressure is offset (superposed) with each other, the stress level of the inner wall area is reduced, the stress level of the outer wall area is improved, and meanwhile, the maximum stress point moves from the inner wall to the central area. The whole stress level of the gas cylinder is effectively reduced, so that the stress intensity factor at the tip of the crack is reduced, the crack expansion threshold value is reduced, and the service life of the gas cylinder is prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a stand and use hydrogen storage gas cylinder based on from reinforcing theory, its characterized in that, includes bottleneck valve module (1) and bottle (2), bottleneck valve module (1) is including spanner (11), valve body (12), cock (13), first spiral shell lid (14), second spiral shell lid (15), spanner (11) are connected with the upper end of cock (13), and the lower part of cock (13) is arranged in valve body (12) inside and is carried out fixed connection through pressing sleeve (16), and the pressing sleeve (16) outside is provided with first spiral shell lid (14), and first spiral shell lid (14) are connected with the upper end of valve body (12) for control cock (13) and the degree of tightness of pressing sleeve (16) cooperation, the lower tip of valve body (12) is connected with bottle (2) through second spiral shell lid (15).
2. The station-used hydrogen storage cylinder based on the self-strengthening theory as claimed in claim 1, wherein the cock (13) comprises an upper plug part (131) and a lower plug part (132) which are integrally formed, the diameter of the upper plug part (131) is smaller than that of the lower plug part (132), the upper end of the upper plug part (131) is provided with a clamping part (133) for clamping with the wrench (11), the lower plug part (132) is provided with a through hole (134) which penetrates through the lower plug part, and the position from the through hole (134) to the bottom end of the cock is of a hollow cylinder structure.
3. The station-used hydrogen storage cylinder based on the self-reinforcing theory as claimed in claim 2, wherein the pressing sleeve (16) is of a hollow cylindrical structure and is sleeved outside the upper plug part (131), the inner diameter of the pressing sleeve (16) is matched with the outer diameter of the upper plug part (131), the upper end of the pressing sleeve (16) is provided with an annular flange (161), and the annular flange (161) is clamped at the upper edge of the valve body (12).
4. The station hydrogen storage cylinder based on the self-strengthening theory as claimed in claim 1, characterized in that the valve body (12) is of a cross-shaped communication structure, the left and right sides of the valve body (12) are provided with communicated side connectors (121), the side connectors (121) are used for being connected with other cylinders or equipment, a cavity (122) for accommodating the cock (13) is arranged inside the valve body (12), and the size of the cavity (122) is matched with the cock (13).
5. The stand-by hydrogen storage cylinder based on self-reinforcing theory as claimed in claim 4, characterized in that the upper end and the lower end of the valve body (12) are provided with external threads, the second screw cap (15) is sleeved outside the lower end of the valve body (12), and the second screw cap (15) is provided with internal threads.
6. The stand-by hydrogen storage cylinder based on the self-reinforcing theory as claimed in claim 5, characterized in that the inner and outer sides of the opening (21) of the cylinder body (2) are respectively provided with an opening internal thread (211) and an opening external thread (212), the opening internal thread (211) corresponds to the external thread at the lower end of the valve body (12), and the opening external thread (212) corresponds to the internal thread of the second screw cap (15).
7. The station-use hydrogen storage cylinder according to self-reinforcing theory of claim 6, characterized in that a sealing groove (213) is provided at the lower part of the internal thread (211) at the mouth of the cylinder, the sealing groove (213) is filled with a rubber ring, and the lower end of the valve body (12) is tightly sealed with the rubber ring.
8. The station-used hydrogen storage cylinder based on the self-strengthening theory as claimed in claim 1, characterized in that the cylinder body (2) is processed by the self-strengthening process, which comprises the following steps:
(1) Through plastic collapse and elastic-plastic finite element analysis, the diameter ratio k is approximately equal to 1.4, the self-reinforcing pressure range is determined through finite element analysis software, the maximum self-reinforcing pressure is checked, and the plastic deformation exceeding 2 percent is avoided; calculating different self-intensification pressures PaCorresponding elasto-plastic interface diameter DPSimultaneously calculating the circumferential residual stress under respective enhanced pressure, and avoiding the occurrence of the bauschinger effect through finite element analysis; fitting the hoop stress to obtain a stress distribution coefficient AiThe device is used for calculating a stress intensity factor, finally carrying out fatigue check according to a pair formula, and calculating allowable cycle times, wherein the result shows that when the self-reinforcing pressure is 1.5-1.6 times of the test pressure, the larger the stress ratio is, the maximum fatigue life of the gas cylinder is;
(2) adding 1.5-1.6 times of test pressure into the bottle body (2) to make the inner wall of the bottle body (2) locally yield and the outer wall still keep elasticity;
(3) and (4) releasing the pressure, finishing the self-reinforcing process, and introducing working pressure for normal use.
9. A gas cylinder set for a station, characterized in that, the hydrogen storage cylinders for the station based on the self-strengthening theory according to any one of claims 1 to 8 are combined, and the hydrogen storage cylinders are connected with side interfaces (121) at two sides of a valve body (12) of the hydrogen storage cylinder through a gas transmission pipeline.
10. A station gas cylinder group according to claim 9, characterized in that the gas cylinder group (3) is further provided with a flow meter (31) and a control valve (32), the side of the gas cylinder group (3) is provided with an alloy support (33) and fixed by the alloy support (33), and the bottom of the gas cylinder group (3) is further provided with a base (34).
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