Regenerative alloy hydrogen storage device

Abstract

This invention relates to the field of hydrogen storage device technology, and in particular to a regenerative alloy hydrogen storage device. It includes a hydrogen storage tank, a heat storage module, an elastic module, and a heat-conducting module. The hydrogen storage tank is filled with a hydrogen storage alloy. The heat storage module is opposite the hydrogen storage tank. Both ends of the elastic module are connected to the hydrogen storage tank and the heat storage module, respectively. One end of the heat-conducting module is connected to the heat storage medium, and the other end extends towards the hydrogen storage tank. Because the elastic module has switchable compression and extension states, during hydrogen charging and discharging, the elastic module is switched to the compression state, allowing the end of the heat-conducting module near the hydrogen storage tank to exchange heat with the hydrogen storage alloy. When the alloy hydrogen storage device is not in operation, the elastic module is switched to the extension state, avoiding heat supply to the hydrogen storage alloy during non-operation, thus effectively improving the energy utilization rate of the heat storage module.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage device technology, and in particular to a regenerative alloy hydrogen storage device. Background Technology

[0002] With the escalating energy crisis and heightened environmental awareness, the utilization of hydrogen energy has received increasing attention. In the engineering application of hydrogen, hydrogen storage has always been a key research focus. Currently, commonly used hydrogen storage methods mainly include the following three types: high-pressure gaseous hydrogen storage, cryogenic liquid hydrogen storage, and solid-state hydrogen storage using metal hydride alloys as the storage medium. Metal hydride hydrogen storage utilizes the reaction between hydrogen gas and alloy storage materials to achieve hydrogen storage. Compared with other hydrogen storage methods, it has advantages such as high hydrogen storage density, good safety, and high hydrogen purity. The principle of alloy hydrogen storage lies in the reaction of alloy (M) with hydrogen to form metal hydrides (MHx).

[0003] The reaction between metal and hydrogen is a reversible process; the forward reaction absorbs hydrogen and releases heat, while the reverse reaction releases hydrogen and absorbs heat. Existing alloy hydrogen storage devices commonly employ heat-conducting fluids to provide or remove the heat required for the reaction, maintaining the reversible reaction between hydrogen and the alloy. However, some hydrogen storage alloys, such as titanium and magnesium alloys, exhibit high hydrogen charging / discharging temperatures, large heat absorption, and relatively poor hydrogen release kinetics. Magnesium alloys, in particular, while achieving a hydrogen storage density of up to 6.5 wt%, require a hydrogen release temperature of around 300°C, necessitating a large amount of heat. This results in high power consumption in the heat exchange system, poor economic efficiency, and limits their commercial application.

[0004] An effective solution is to employ heat storage to efficiently store the energy released by the hydrogen storage alloy during hydrogen charging. The stored heat is then used to release hydrogen from the alloy. Considering the unavoidable energy loss during the process, some of the released hydrogen can be supplemented by catalytic combustion heating. For example, a heat storage hydrogen storage device proposed in patent document CN01145323.0, although using a heat storage tube to store energy, suffers from difficulty in controlling the heat transfer process because the heat storage tube and the alloy hydrogen storage material are always in contact. Even in non-operating states, the heat storage tube still transfers heat to the alloy hydrogen storage material, causing it to release hydrogen, thus reducing the utilization rate of the heat stored in the heat storage tube. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a heat storage alloy hydrogen storage device to solve the technical problem that the heat stored in the existing heat storage alloy hydrogen storage device is not easy to control, resulting in low utilization rate of the stored heat.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a regenerative alloy hydrogen storage device, comprising:

[0007] A hydrogen storage tank, the interior of which is filled with a hydrogen storage alloy;

[0008] A heat storage module, which has a heat storage medium for heat storage;

[0009] An elastic module, the two ends of which are respectively connected to the hydrogen storage tank and the heat storage module, the elastic module having a switchable compression state and a tension state;

[0010] A heat-conducting module is provided, wherein one end of the heat-conducting module is connected to the heat storage medium and forms a heat exchange with the heat storage medium, and the other end of the heat-conducting module extends toward the hydrogen storage tank. When the elastic module is in a compressed state, the heat-conducting module forms a heat exchange with the hydrogen storage alloy. When the elastic module is in a stretched state, the heat-conducting module is disconnected from the heat exchange with the hydrogen storage alloy.

[0011] Optionally, the hydrogen storage tank is provided with a heat-conducting liquid, which is connected to the hydrogen storage alloy and is used to form heat exchange with the hydrogen storage alloy. When the elastic module is in a compressed state, the heat-conducting module contacts the heat-conducting liquid and forms heat exchange with the heat-conducting liquid. When the elastic module is in a stretched state, the heat-conducting module moves away from the heat-conducting liquid and is no longer in heat exchange with the heat-conducting liquid.

[0012] Optionally, the hydrogen storage tank has a heat-conducting cavity inside, the heat-conducting liquid fills the heat-conducting cavity and is located at the end of the heat-conducting cavity away from the heat storage module, the end of the heat-conducting module near the hydrogen storage tank is inserted into the heat-conducting cavity and forms a spacer cavity with the side wall of the heat-conducting cavity, the heat-conducting module can be inserted to make the heat-conducting liquid fill the spacer cavity.

[0013] Optionally, the regenerative alloy hydrogen storage device further includes a guide frame, which is fixed to the hydrogen storage tank and extends toward the heat storage module. The guide frame is provided with a first stop, and the heat storage module is provided with a second stop opposite to the first stop. The second stop is slidably connected to the guide frame, and the second stop can abut against the first stop by the compression of the elastic module.

[0014] Optionally, the regenerative alloy hydrogen storage device further includes a hydrogen release heating module located around the hydrogen storage tank, which provides heat for the hydrogen release of the hydrogen storage alloy through catalytic combustion.

[0015] Optionally, the hydrogen release heating module is provided with a combustion chamber, and the surface of the hydrogen storage tank is provided with a heat-conducting element that extends into the combustion chamber. The heat-conducting element is used to form a heat exchange with the hydrogen storage alloy, directing the heat of the hydrogen storage alloy to the combustion chamber to preheat the catalyst in the combustion chamber, or directing the heat generated by combustion in the combustion chamber to the hydrogen storage alloy.

[0016] Optionally, the thermal regenerative alloy hydrogen storage device further includes a hydrogen supply module, which includes a hydrogen supply main pipe, one end of which is provided with a hydrogen supply port, and the other end of which is inserted into the hydrogen storage tank. The end of the hydrogen supply main pipe inserted into the hydrogen storage tank is provided with a hydrogen supply micropore, and the hydrogen supply main pipe is used to release hydrogen through the hydrogen supply micropore.

[0017] Optionally, the hydrogen supply module further includes a hydrogen supply branch pipe and a shut-off valve. One end of the hydrogen supply branch pipe is connected to the main hydrogen supply pipe, and the other end of the hydrogen supply branch pipe is connected to the combustion chamber. The hydrogen supply branch pipe is used to supply a portion of the hydrogen gas discharged from the main hydrogen supply pipe into the combustion chamber. The shut-off valve is installed on the hydrogen supply branch pipe and is used to control the on / off state of the hydrogen supply branch pipe.

[0018] Optionally, the heat conduction module includes a plurality of spaced heat conduction tubes, one end of each heat conduction tube being connected to the heat storage medium, and the other end of each heat conduction tube extending toward the hydrogen storage tank.

[0019] Optionally, the elastic module includes a bellows, with both ends of the bellows fixed to the heat storage module and the hydrogen storage tank, respectively. The heat storage module, the hydrogen storage tank, and the bellows enclose a vacuum cavity, and the portion of the heat conduction module located between the heat storage module and the hydrogen storage tank is located within the vacuum cavity.

[0020] Compared with existing technologies, the beneficial effects of the regenerative alloy hydrogen storage device provided by this invention include: by setting up a hydrogen storage tank, a heat storage module, an elastic module, and a heat conduction module, the hydrogen storage tank is filled with a hydrogen storage alloy. When the hydrogen storage tank is filled with hydrogen, the hydrogen storage alloy reacts with the hydrogen gas to store the hydrogen in a solid form while releasing heat to the outside. When the hydrogen storage tank is discharged, the hydrogen storage alloy absorbs heat to the outside, thereby reacting and releasing hydrogen gas. The heat storage module is opposite to the hydrogen storage tank. The two ends of the elastic module are respectively connected to the hydrogen storage tank and the heat storage module. One end of the heat conduction module is connected to the heat storage medium, which can form heat exchange with the heat storage medium. The other end of the heat conduction module extends towards the hydrogen storage tank. Because the elastic module has a switchable compression state and In the stretched state, during hydrogen charging and discharging, the elastic module is switched to the compressed state, allowing the end of the heat-conducting module near the hydrogen storage tank to exchange heat with the hydrogen storage alloy. This facilitates the transfer of heat generated by the hydrogen storage alloy to the heat-conducting module during charging, and then to the heat storage module for storage. During hydrogen discharging, the heat storage module can transfer the stored heat to the hydrogen storage alloy through the heat-conducting module, providing the necessary heat for hydrogen discharging. When the alloy hydrogen storage device is not in operation, the elastic module can be switched to the stretched state, detaching the heat-conducting module from the hydrogen storage alloy. This effectively avoids supplying heat to the hydrogen storage alloy when not in operation, significantly improving the energy utilization rate of the heat storage module and reducing the hydrogen discharging cost of the heat storage alloy hydrogen storage device. Attached Figure Description

[0021] Figure 1 A cross-sectional view of the elastic module of the regenerative alloy hydrogen storage device provided in an embodiment of the present invention under tension.

[0022] Figure 2 For along Figure 1 Sectional view along line AA in the middle.

[0023] Figure 3 A cross-sectional view of the elastic module of the regenerative alloy hydrogen storage device provided in an embodiment of the present invention in a contracted state.

[0024] The following are the labeling elements in the figure:

[0025] 10—Hydrogen storage tank; 11—Hydrogen storage alloy; 12—Heat transfer fluid

[0026] 13—Heat-conducting cavity 14—Spacer cavity 15—Heat-conducting component

[0027] 20—Heat storage module; 21—Heat storage medium; 22—Heat storage tank

[0028] 23—Heat storage fins; 24—Second baffle; 30—Elastic module

[0029] 31—Bellwall 32—Vacuum Chamber 40—Heat Conducting Module

[0030] 41—Heat pipe; 50—Guide frame; 51—First stop block

[0031] 60—Hydrogen release heating module; 61—Combustion chamber; 62—Catalyst

[0032] 63—Oxygen supply port; 64—Waste discharge port; 70—Hydrogen supply module

[0033] 71—Main hydrogen supply pipe; 72—Filter; 73—Branch hydrogen supply pipe

[0034] 74—Stop valve; 221—Insulation layer; 711—Hydrogen supply port. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] This invention provides a regenerative alloy hydrogen storage device, such as... Figures 1-3 As shown, it includes a hydrogen storage tank 10, the interior of which is filled with a hydrogen storage alloy 11.

[0037] Specifically, when the hydrogen storage tank 10 is filled with hydrogen, the hydrogen storage alloy 11 reacts with the hydrogen to store the hydrogen in a solid form and releases heat to the outside. When the hydrogen storage tank 10 is released with hydrogen, the hydrogen storage alloy 11 absorbs heat to the outside, thereby reacting and releasing hydrogen.

[0038] In this embodiment, the hydrogen storage alloy 11 includes rare earth AB5 type alloys, titanium (Ti-) and zirconium (Zr-) AB2 type alloys, magnesium (Mg-) alloys, vanadium solid solution alloys, and rare earth-magnesium-nickel (RE-Mg-Ni) alloys, which are materials that can form reversible hydrides with hydrogen.

[0039] In this embodiment, as Figure 1 and 3As shown, the regenerative alloy hydrogen storage device also includes a heat storage module 20, an elastic module 30, and a heat conduction module 40. The heat storage module 20 is opposite to the hydrogen storage tank 10 and has a heat storage medium for storing heat through the heat storage medium 21. The two ends of the elastic module 30 are connected to the hydrogen storage tank 10 and the heat storage module 20, respectively. The elastic module 30 has a switchable compressed state and a stretched state. The heat conduction module 40 is used for heat conduction. One end of the heat conduction module 40 is connected to the heat storage medium 21 and forms a heat exchange with the heat storage medium 21. The other end of the heat conduction module 40 extends toward the hydrogen storage tank 10. When the elastic module 30 is in the compressed state, the heat conduction module 40 forms a heat exchange with the hydrogen storage alloy 11. When the elastic module 30 is in the stretched state, the heat conduction module 40 is disconnected from the heat exchange with the hydrogen storage alloy 11.

[0040] Specifically, since the elastic module 30 has a switchable compressed state and a stretched state, during the hydrogen filling and releasing process, the elastic module 30 can be switched to the compressed state, so that the end of the heat-conducting module 40 near the hydrogen storage tank 10 can form a heat exchange with the hydrogen storage alloy 11. This allows the heat generated by the hydrogen storage alloy 11 to be transferred to the heat-conducting module 40 during the hydrogen filling process, and then transferred to the heat storage module 20 for storage via the heat-conducting module 40. At the same time, during the hydrogen releasing process, the heat storage module 20 transfers the stored heat to the hydrogen storage alloy 11 through the heat-conducting module 40, providing the hydrogen storage alloy 11 with the heat required for hydrogen release.

[0041] When the alloy hydrogen storage device is not in operation, the elastic module 30 can be switched to the stretched state, so that the heat conduction module 40 is separated from the heat exchange with the hydrogen storage alloy 11. This can effectively avoid supplying heat to the hydrogen storage alloy 11 in the non-operating state, effectively improve the energy utilization rate of the heat storage module 20, reduce the extra heat required during the hydrogen release process, and reduce the hydrogen release cost of the heat storage alloy hydrogen storage device.

[0042] In this embodiment, as Figure 1 and 3 As shown, the heat storage module 20 also includes a heat storage tank 22 and heat storage fins 23. An insulation layer 221 is provided on the outside of the heat storage tank 22. The heat storage medium 21 is filled in the heat storage tank 22. The heat storage fins 23 are installed in the heat storage tank 22 and are in contact with the heat storage medium 21. The upper end of the heat conduction module 40 is fixed to the heat storage fins 23.

[0043] In this embodiment, the heat storage medium 21 is further a material with relatively high heat capacity and low cost, such as liquid water, a mixture of Al2O3 and TiO2 sintered at high temperature. Furthermore, the heat storage medium 21 preferably involves a phase change material, such as mirabilite, water / steam, calcium chloride hexahydrate, organic alcohols, etc., and can also be a combination of sensible heat storage and phase change storage using single-phase or mixed-phase materials.

[0044] In this embodiment, the insulation layer 221 is preferably made of glass wool or aerogel.

[0045] Understandably, the elastic module 30 can be any device with elasticity and deformation function, such as a spring, as long as it can form or detach the heat-conducting module 40 from the hydrogen storage alloy 11 through compression and stretching.

[0046] In this embodiment, as Figure 1 and 3 As shown, the elastic module 30 includes a bellows 31, with its two ends fixed to the heat storage tank 22 and the hydrogen storage tank 10, respectively. The heat storage tank 22, the hydrogen storage tank 10, and the bellows 31 enclose a vacuum cavity 32. The heat-conducting module 40 is located within the vacuum cavity 32, between the heat storage tank 22 and the hydrogen storage tank 10. The vacuum cavity 32 provides excellent thermal insulation, effectively preventing heat loss during the transfer between the heat storage tank 22 and the hydrogen storage tank 10.

[0047] Understandably, the heat-conducting module 40 can directly contact the hydrogen storage alloy 11 to form a heat exchange with the hydrogen storage alloy 11, or it can form a heat exchange with the hydrogen storage alloy 11 through contact with a heat-conducting material that is in contact with the hydrogen storage alloy 11.

[0048] In this embodiment, as Figures 1-3 As shown, the heat conduction module 40 includes a plurality of spaced heat conduction pipes 41, one end of each heat conduction pipe 41 being connected to the heat storage medium 21, and the other end of each heat conduction pipe 41 extending toward the hydrogen storage tank 10. The interior of each heat conduction pipe 41 is filled with a heat conduction medium, preferably naphthalene, mercury, or potassium.

[0049] In this embodiment, as Figure 1 and 3 As shown, a heat-conducting liquid 12 is provided inside the hydrogen storage tank 10. The heat-conducting liquid 12 is connected to the hydrogen storage alloy 11 and is used to form heat exchange with the hydrogen storage alloy 11. When the elastic module 30 is in a compressed state, the heat-conducting module 40 contacts the heat-conducting liquid 12 and forms heat exchange with the heat-conducting liquid 12. When the elastic module 30 is in a stretched state, the heat-conducting module 40 moves away from the heat-conducting liquid 12 and is no longer in heat exchange with the heat-conducting liquid 12. Specifically, the heat-conducting liquid 12 serves as an intermediate medium for heat exchange between the heat-conducting module 40 and the hydrogen storage alloy 11. It avoids direct contact between the heat-conducting medium and the hydrogen storage alloy 11, replacing the solid contact with the hydrogen storage alloy 11 with the liquid contact of the heat-conducting liquid 12, thereby facilitating heat exchange between the hydrogen storage alloy 11 and the heat-conducting medium.

[0050] In this embodiment, the heat transfer fluid 12 has the characteristics of stable properties, high thermal conductivity, and moderate viscosity, and the preferred material is alkyl biphenyl or alkyl naphthalene type heat transfer oil.

[0051] In this embodiment, as Figure 1 and 3As shown, the hydrogen storage tank 10 has a heat-conducting cavity 13 inside. A heat-conducting liquid 12 fills the heat-conducting cavity 13 and is located at the end of the heat-conducting cavity 13 furthest from the heat storage module 20. A heat-conducting module 40 is inserted into the heat-conducting cavity 13 at the end closest to the hydrogen storage tank 10, forming a spacer cavity 14 with the sidewall of the heat-conducting cavity 13. The heat-conducting module 40 can fill the spacer cavity 14 by inserting the heat-conducting liquid 12. Specifically, the spacer cavity 14 formed between the heat-conducting module 40 and the sidewall of the heat-conducting cavity 13 avoids heat exchange between the heat-conducting pipe 41 connected to the hydrogen storage alloy 11 in the non-working state. Simultaneously, in the working state, the elastic module 30 is in a compressed state, and the heat-conducting module 40 inserts the heat-conducting liquid 12, causing the heat-conducting liquid 12 to rise and fill the spacer cavity 14. This effectively increases the contact area between the heat-conducting liquid 12 and the heat-conducting module 40, thereby accelerating the heat exchange between the heat-conducting module 40 and the hydrogen storage alloy 11.

[0052] In this embodiment, further, such as Figures 1-3 As shown, several heat-conducting cavities 13 are provided, each heat-conducting cavity 13 has an opening at its upper end, and the lower end of each heat-conducting pipe 41 is inserted into the heat-conducting cavity 13 from the upper opening of each heat-conducting cavity 13. When the elastic module 30 is in a stretched state, the lower end of each heat-conducting pipe 41 is spaced apart from the heat-conducting liquid 12.

[0053] In this embodiment, further, such as Figure 1 and 3 As shown, the heat-conducting cavity 13 includes a first heat-conducting section and a second heat-conducting section connected to the first heat-conducting section. The first heat-conducting section and the second heat-conducting section are located at the ends of the hydrogen storage tank 10 that are close to and far from the heat storage module 20, respectively. The hydrogen storage alloy 11 extends from the second heat-conducting section to the first heat-conducting section. The heat-conducting liquid 12 is filled in the second heat-conducting section. The heat-conducting module 40 is inserted into the first heat-conducting section and forms a spacer cavity 14 with the sidewall of the first heat-conducting section. The heat-conducting module 40 can contact the heat-conducting liquid 12 by moving towards the first heat-conducting section and make the heat-conducting liquid 12 fill the spacer cavity 14.

[0054] In this embodiment, as Figure 1 and 3 As shown, the regenerative alloy hydrogen storage device also includes a guide frame 50, which is fixed to the hydrogen storage tank 10 and extends toward the heat storage module 20. The guide frame 50 is provided with a first stop 51, and the heat storage module 20 is provided with a second stop 24 opposite to the first stop 51. The second stop 24 is slidably connected to the guide frame 50, and the second stop 24 can abut against the first stop 51 by the compression of the elastic module 30. Specifically, the guide frame 50 can provide guidance for the movement of the heat storage module 20 toward or away from the hydrogen storage tank 10, thereby facilitating the compression or stretching of the elastic module 30. The first stop 51 and the second stop 24 can provide positioning for the compression of the elastic module 30, so that the elastic module 30 achieves the optimal degree of compression.

[0055] In this embodiment, further, as Figure 3 As shown, when the first block 51 and the second block 24 abut against each other, the heat-conducting module 40 inserts into the heat-conducting liquid 12, and at the same time, the heat-conducting liquid 12 fills the spacer cavity 14.

[0056] In this embodiment, further, as Figures 1-3 As shown, the regenerative alloy hydrogen storage device also includes a hydrogen release heat-assisted module 60, which is located on the periphery of the hydrogen storage tank 10 and is used to provide heat for the hydrogen release of the hydrogen storage alloy 11 through catalytic combustion. Specifically, during the hydrogen release operation, since the heat stored in the heat storage module 20 is insufficient to maintain the heat stored in the hydrogen storage alloy 11 during hydrogen release, additional external heat is required to support the hydrogen release of the hydrogen storage alloy 11. With the setting of the hydrogen release heat-assisted module 60, during the hydrogen release operation, only the catalytic combustion effect of the hydrogen release heat-assisted module 60 is needed to provide the additional heat required for hydrogen release to the hydrogen storage alloy 11, which facilitates the hydrogen release operation of the alloy hydrogen storage device. By setting the hydrogen release heat-assisted module 60 on the periphery of the hydrogen storage tank 10, the heat transfer from the hydrogen release heat-assisted module 60 to the hydrogen storage alloy 11 can be accelerated.

[0057] In this embodiment, further, as Figures 1-3 As shown, the hydrogen release heating module 60 is equipped with a combustion chamber 61, and a heat-conducting element 15 is provided on the surface of the hydrogen storage tank 10, extending into the combustion chamber 61. The heat-conducting element 15 is used to form a heat exchange with the hydrogen storage alloy 11, guiding the heat of the hydrogen storage alloy 11 to the combustion chamber 61 to preheat the catalyst 62 in the combustion chamber 61, or guiding the heat generated by combustion in the combustion chamber 61 to the hydrogen storage alloy 11. Specifically, during hydrogen release, the catalytic combustion of fuel in the combustion chamber 61 can effectively supply heat to the hydrogen storage alloy 11 for hydrogen release, and the heat-conducting element 15 can accelerate the heat transfer efficiency to the hydrogen storage alloy 11. At the same time, during hydrogen charging, a portion of the heat released by the hydrogen storage alloy 11 can be guided to the combustion chamber 61 through the heat-conducting element 15 and absorbed by the catalyst 62 in the heat-conducting chamber 13 for catalytic combustion reaction, thereby preheating the catalyst 62 and further utilizing the heat released during the hydrogen charging process of the hydrogen storage alloy 11, effectively reducing the hydrogen release cost of the regenerative alloy hydrogen storage device.

[0058] In this embodiment, the catalyst 62 for catalytic combustion is further granular catalyst 62, preferably a supported Pt catalyst 62 with γ-Al2O3-carbon nanotubes (CNT) as the support.

[0059] In this embodiment, the heat-conducting element 15 is further defined as a heat-conducting fin.

[0060] In this embodiment, further, as Figure 1 and 3As shown, the regenerative alloy hydrogen storage device also includes a hydrogen supply module 70. The hydrogen supply module 70 includes a hydrogen supply main pipe 71, one end of which is provided with a hydrogen supply port 711, and the other end of the hydrogen supply main pipe 71 is inserted into the hydrogen storage tank 10. The end of the hydrogen supply main pipe 71 inserted into the hydrogen storage tank 10 is provided with a hydrogen supply micro-hole, which is used to release hydrogen through the hydrogen supply micro-hole. Specifically, by providing the hydrogen supply main pipe 71 and the hydrogen supply micro-hole, the hydrogen supply module 70 facilitates the distribution of hydrogen to the hydrogen storage alloy 11 during hydrogen filling and the collection of hydrogen during hydrogen release.

[0061] In this embodiment, the hydrogen supply main tube 71 is a stainless steel powder sintered tube, and the pore size of the hydrogen supply micropores is between 10 and 30 μm.

[0062] In this embodiment, further, as Figure 1 and 3 As shown, the hydrogen supply module 70 also includes a filter 72, which is installed in the hydrogen supply main pipe 71. The diameter of the filter pores of the filter 72 is between 0.5 and 1 μm.

[0063] In this embodiment, further, as Figure 1 and 3 As shown, the hydrogen supply module 70 also includes a hydrogen supply branch pipe 73 and a shut-off valve 74. One end of the hydrogen supply branch pipe 73 is connected to the main hydrogen supply pipe 71, and the other end of the hydrogen supply branch pipe 73 is connected to the combustion chamber 61. The hydrogen supply branch pipe 73 is used to supply part of the hydrogen gas discharged from the main hydrogen supply pipe 71 into the combustion chamber 61. The shut-off valve 74 is installed on the hydrogen supply branch pipe 73 and is used to control the opening and closing of the hydrogen supply branch pipe 73. Specifically, during hydrogen charging, the shut-off valve 74 is closed, and hydrogen is supplied from the hydrogen supply port 711 into the hydrogen supply main pipe 71. Finally, it is distributed to various parts of the hydrogen storage alloy 11 through the hydrogen supply micropores. When storing hydrogen, the hydrogen storage alloy 11 preheats the catalyst 62 in the combustion chamber 61, raising the temperature of the catalyst 62. During hydrogen release, the shut-off valve 74 is opened, and part of the hydrogen in the hydrogen supply main pipe 71 is released from the hydrogen supply port 711, while another part of the hydrogen is supplied from the gas supply branch pipe into the combustion chamber 61, providing the fuel required for catalytic combustion in the combustion chamber 61. Thus, the system can provide the heat required for releasing hydrogen through its own circulation, effectively simplifying the structure of the alloy hydrogen storage device and reducing its volume.

[0064] In this embodiment, as Figure 1 and 3 As shown, the hydrogen release heating module 60 is also equipped with an oxygen supply port 63 and a waste discharge port 64. The oxygen supply port 63 and the waste discharge port 64 are used to supply oxygen and discharge the waste generated in the reaction, respectively.

[0065] In this embodiment, the heat storage medium 21 is calcium chloride hexahydrate, the heat transfer medium is naphthalene, the insulation layer 221 is made of glass wool, the hydrogen storage alloy 11 is a titanium alloy, the heat transfer fluid 12 is an alkyl biphenyl type heat transfer oil, the gas duct is a stainless steel powder sintered tube with an average pore size of 30 μm, the filter 72 is a powder sintered stainless steel with an average pore size of 1 μm, and the catalytic combustion catalyst 62 is a supported Pt particulate catalyst 62 with γ-Al₂O₃-carbon nanotubes (CNTs) as the carrier. After 100 hydrogen charging and discharging cycles, the alloy hydrogen storage device has a maximum hydrogen supply flow rate of 150 SL / min, an effective hydrogen storage capacity of 5 kg, a comprehensive thermal efficiency of ≥80%, and stable operation.

[0066] In this embodiment, the heat storage medium 21 is an organic alcohol, the heat transfer medium is mercury, the insulation layer 221 is made of aerogel, the hydrogen storage alloy 11 is a magnesium alloy, the heat transfer fluid 12 is an alkylnaphthalene type heat transfer oil, the gas duct is a stainless steel powder sintered tube with an average pore size of 10 μm, the filter 72 is a powder sintered stainless steel with an average pore size of 0.5 μm, and the catalytic combustion catalyst 62 is a supported Pt particulate catalyst 62 with γ-Al₂O₃-carbon nanotubes (CNTs) as the carrier. After 150 hydrogen charge-discharge cycles, the alloy hydrogen storage device has a maximum hydrogen supply flow rate of 320 SL / min, an effective hydrogen storage capacity of 10 kg, a comprehensive thermal efficiency of ≥85%, and stable operation.

[0067] The specific working process of this invention is as follows: Before hydrogen charging, such as... Figure 3 As shown, the bellows 31 is switched to the compression state until the first stop 51 and the second stop 24 abut against each other, so that the lower end of each heat-conducting pipe 41 is inserted into the heat-conducting liquid 12 and the heat-conducting liquid 12 fills the spacer cavity 14. During hydrogen charging, hydrogen is supplied to the hydrogen supply main pipe 71 through the hydrogen supply port 711. Hydrogen enters the hydrogen storage alloy 11 through the hydrogen supply micropore. The hydrogen storage alloy 11 reacts with the hydrogen to store the hydrogen in a solid state. At the same time, heat is released to the outside. Part of the heat is guided by the heat-conducting liquid 12 to the heat-conducting pipe 41 and transferred to the heat storage medium 21 through the heat-conducting pipe 41 for heat storage. The other part of the heat is introduced into the combustion chamber 61 through the heat-conducting component 15 to preheat the catalyst 62 in the combustion chamber 61.

[0068] After hydrogen charging is complete, switch bellows 31 to the stretched state, as follows: Figure 1 As shown, the heat pipe 41 is moved away from the heat transfer fluid 12 to cut off the heat transfer between the heat pipe 41 and the heat transfer fluid 12.

[0069] When performing hydrogen release operations, such as Figure 3As shown, the shut-off valve 74 is opened, and the bellows 31 is switched to the compression state until the first stop 51 and the second stop 24 abut against each other, so that the lower end of each heat-conducting pipe 41 is inserted into the heat-conducting liquid 12. The heat stored in the heat storage medium 21 is transferred to the heat-conducting liquid 12 through the heat-conducting pipe 41, and then transferred to the hydrogen storage alloy 11 by the heat-conducting liquid 12 to heat the hydrogen storage alloy 11. The hydrogen storage alloy 11 releases hydrogen by absorbing heat. The hydrogen enters the hydrogen supply main pipe 71 through the hydrogen supply micropore. Part of the hydrogen is supplied from the hydrogen supply port 711, and another part of the hydrogen is supplied into the combustion chamber 61 from the hydrogen supply branch pipe 73, and air or oxygen is supplied through the oxygen supply port 63. This part of the hydrogen undergoes rapid catalytic combustion under the action of the preheated catalyst 62 to further heat the hydrogen storage alloy 11.

[0070] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A regenerative alloy hydrogen storage device, characterized in that, include: A hydrogen storage tank, the interior of which is filled with a hydrogen storage alloy; A heat storage module, which has a heat storage medium for heat storage; An elastic module, the two ends of which are respectively connected to the hydrogen storage tank and the heat storage module, the elastic module having a switchable compression state and a tension state; A heat-conducting module is provided, wherein one end of the heat-conducting module is connected to the heat storage medium and forms a heat exchange with the heat storage medium, and the other end of the heat-conducting module extends toward the hydrogen storage tank. When the elastic module is in a compressed state, the heat-conducting module forms a heat exchange with the hydrogen storage alloy, so that the heat storage module stores heat during hydrogen filling and transfers the stored heat to the hydrogen storage alloy during hydrogen release. When the elastic module is in a stretched state, the heat-conducting module is disconnected from the heat exchange with the hydrogen storage alloy. The regenerative alloy hydrogen storage device also includes a guide frame, which is fixed to the hydrogen storage tank and extends toward the heat storage module. The guide frame is provided with a first stop, and the heat storage module is provided with a second stop opposite to the first stop. The second stop is slidably connected to the guide frame, and the second stop can abut against the first stop by the compression of the elastic module. The elastic module includes a bellows, with its two ends fixed to the heat storage module and the hydrogen storage tank, respectively. The heat storage module, the hydrogen storage tank, and the bellows enclose a vacuum cavity, and the portion of the heat conduction module located between the heat storage module and the hydrogen storage tank is located within the vacuum cavity.

2. The regenerative alloy hydrogen storage device according to claim 1, characterized in that, The hydrogen storage tank is equipped with a heat-conducting liquid, which is connected to the hydrogen storage alloy to form a heat exchange with the hydrogen storage alloy. When the elastic module is in a compressed state, the heat-conducting module contacts the heat-conducting liquid and forms a heat exchange with the heat-conducting liquid. When the elastic module is in a stretched state, the heat-conducting module moves away from the heat-conducting liquid and is no longer in heat exchange with the heat-conducting liquid.

3. The regenerative alloy hydrogen storage device according to claim 2, characterized in that, The hydrogen storage tank has a heat-conducting cavity inside. The heat-conducting liquid fills the heat-conducting cavity and is located at the end of the heat-conducting cavity away from the heat storage module. The end of the heat-conducting module close to the hydrogen storage tank is inserted into the heat-conducting cavity and forms a spacer cavity with the side wall of the heat-conducting cavity. The heat-conducting module can fill the spacer cavity by inserting the heat-conducting liquid.

4. The regenerative alloy hydrogen storage device according to any one of claims 1 to 3, characterized in that, It also includes a hydrogen release heating module, which is located on the periphery of the hydrogen storage tank and is used to provide heat for the hydrogen release of the hydrogen storage alloy through catalytic combustion.

5. The regenerative alloy hydrogen storage device according to claim 4, characterized in that, The hydrogen release heating module is provided with a combustion chamber, and the surface of the hydrogen storage tank is provided with a heat-conducting element that extends into the combustion chamber. The heat-conducting element is used to form a heat exchange with the hydrogen storage alloy, directing the heat of the hydrogen storage alloy to the combustion chamber, preheating the catalyst in the combustion chamber, or directing the heat generated by combustion in the combustion chamber to the hydrogen storage alloy.

6. The regenerative alloy hydrogen storage device according to claim 5, characterized in that, It also includes a hydrogen supply module, which includes a hydrogen supply main pipe, one end of which is provided with a hydrogen supply port, and the other end of which is inserted into the hydrogen storage tank. The end of the hydrogen supply main pipe inserted into the hydrogen storage tank is provided with a hydrogen supply micropore, and the hydrogen supply main pipe is used to release hydrogen through the hydrogen supply micropore.

7. The regenerative alloy hydrogen storage device according to claim 6, characterized in that, The hydrogen supply module also includes a hydrogen supply branch pipe and a shut-off valve. One end of the hydrogen supply branch pipe is connected to the main hydrogen supply pipe, and the other end of the hydrogen supply branch pipe is connected to the combustion chamber. The hydrogen supply branch pipe is used to supply a portion of the hydrogen gas discharged from the main hydrogen supply pipe into the combustion chamber. The shut-off valve is installed on the hydrogen supply branch pipe and is used to control the on / off state of the hydrogen supply branch pipe.

8. The regenerative alloy hydrogen storage device according to any one of claims 1 to 3, characterized in that, The heat-conducting module includes a plurality of spaced heat-conducting pipes, one end of each heat-conducting pipe being connected to the heat storage medium, and the other end of each heat-conducting pipe extending toward the hydrogen storage tank.

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