Detachable metal hydride solid hydrogen storage device

Abstract

The invention relates to a metal hydride solid hydrogen storage device, in particular to a detachable metal hydride solid hydrogen storage device which comprises a shell, a flange and a blind flange, a hydrogen conveying pipe and the flange are welded to the shell, the hydrogen conveying pipe serves as a hydrogen flow channel, a U-shaped heat exchange pipe and a temperature measuring protective sleeve are welded to the blind flange, and the U-shaped heat exchange pipe serves as the temperature measuring protective sleeve. Hydrogen is absorbed by introducing a hydrogen cylinder into a pipeline system through a pressure reducing valve and then entering a metal hydride solid hydrogen storage device through a hydrogen conveying pipe, so that a first-stage hydrogen absorption process can be completed; a reversible chemical reaction in the hydrogen absorption process is carried out in the forward direction to generate a large amount of heat, if the heat is not discharged in time, the further hydrogen absorption process of the hydrogen storage material can be influenced, at the moment, a certain flow of cooling water is introduced into the upper U-shaped heat exchange pipe by controlling a water path, and the heat generated in the hydrogen storage material is conducted to the wall of the heat exchange pipe through the aluminum annular fins on the heat exchange pipe; and the water is timely taken away by cooling water through convective heat exchange.

Description

Technical Field

[0001] The invention relates to a metal hydride solid-state hydrogen storage device, in particular to a detachable metal hydride solid-state hydrogen storage device. Background Art

[0002] The existing metal hydride solid hydrogen storage device includes an outer shell and an internal heat exchange structure, and generally does not contain an inner liner. The hydrogen storage material is directly loaded inside the outer shell, and the heat exchange tube is connected to the elliptical head of the tank body by welding, and the elliptical head is further welded to the outer shell of the tank body. This structure design without an inner liner has the following typical defects: 1. The hydrogen storage material is mostly loaded after being compressed into blocks, and the internal heat exchange structure is complicated, so it is more difficult to load the material with this structure; 2. After a period of hydrogen absorption and desorption, the performance of the hydrogen storage material decreases, and it is difficult to replace the original material; 3. During the cyclic dehydrogenation process of the structure without an inner liner, due to the pulverization of the hydrogen storage alloy, the alloy powder is easily released into the subsequent pipeline with the hydrogen, resulting in a blockage accident. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention is proposed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a detachable metal hydride solid hydrogen storage device, comprising a shell, a flange, and a blind flange. A hydrogen transmission pipe and a flange are welded on the shell, and the hydrogen transmission pipe serves as a hydrogen flow channel. A U-shaped heat exchange tube and a temperature measuring sheath tube are welded on the blind flange, and the U-shaped heat exchange tube serves as a cold and hot water flow channel.

[0005] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, wherein: annular fins and end plates are welded on the U-shaped heat exchange tube, and an outer protective plate is welded on the end plate.

[0006] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, the top of the outer protective plate is connected by a filter screen, the outer protective plate is filled with a hydrogen storage alloy, and hydrogen is introduced into the device through the hydrogen transmission pipe.

[0007] As a preferred solution of the detachable metal hydride solid-state hydrogen storage device described in the present invention, the hydrogen passing through the hydrogen transmission pipe diffuses into the hydrogen storage alloy through the filter to complete the hydrogen absorption process; the hydrogen inside the material is desorbed by heat, diffuses into the interlayer through the filter, and is released through the hydrogen transmission pipe.

[0008] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, the temperature measuring sheath tube is fixed to the flange by welding, and the temperature measuring sheath tube is buried in the hydrogen storage material.

[0009] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, a temperature sensor is provided in the temperature measuring sheath tube.

[0010] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, the U-shaped heat exchange tube is a 304 stainless steel seamless tube.

[0011] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, a heat-insulating layer is provided on the outside of the shell.

[0012] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, a fixing bracket is provided at the lower part of the shell.

[0013] As a preferred solution of the detachable metal hydride solid hydrogen storage device of the present invention, a special sealing gasket is provided between the flange and the blind flange.

[0014] Beneficial effects of the present invention: Hydrogen absorption: The first stage of hydrogen absorption process can be completed by using a hydrogen cylinder to enter the pipeline system after passing through a pressure reducing valve, and then entering the metal hydride solid hydrogen storage device through the hydrogen transmission pipe; since the hydrogen absorption process is a reversible chemical reaction that is carried out in a forward direction to generate a large amount of heat, if it is not discharged in time, it will affect the further hydrogen absorption process of the hydrogen storage material. At this time, by controlling the water path, a certain flow of cooling water is introduced into the upper U-shaped heat exchange tube, and the heat generated inside the hydrogen storage material is conducted to the heat exchange tube wall through the aluminum annular fins on the heat exchange tube, and then is taken away by the cooling water in time through convection heat exchange, thereby reducing the temperature inside the device and continuing the hydrogen absorption reaction. After a period of time, the hydrogen storage material in the device is gradually filled with hydrogen and the hydrogen absorption reaction stops.

[0015] Hydrogen release: utilizing the characteristic that heating can reverse the above-mentioned reversible chemical reaction, a certain flow of heating water is introduced into the lower U-shaped heat exchange tube by controlling the water path, and the heat carried by the heating water is evenly transferred to the interior of the hydrogen storage material through convection and conduction. At this time, the hydrogen storage material is a metal hydride fully absorbed with hydrogen, and it will decompose when heated, thereby continuously desorbing hydrogen. Under certain back pressure conditions, the desorbed hydrogen can be released through the hydrogen transmission pipe. After a period of time, the hydrogen release reaction stops, and the hydrogen stored in the material is almost released. From then on, a cycle of hydrogen absorption and desorption reaction process ends.

[0016] Material replacement: After a period of continuous hydrogen absorption and desorption, the flange needs to be opened to remove the inner tank, clean and dry it, pour out the old material and fill it with new material, then install the filter screen in turn and reseal it, and then it can continue to be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 This is a front view of the overall structure of the hydrogen storage unit of the present invention.

[0019] Figure 2 The left side view of the overall structure of the hydrogen storage unit of the present invention

[0020] Figure 3 AA view of the hydrogen storage unit structure of the present invention

[0021] Figure 4 Front view of the U-shaped heat exchange tube structure

[0022] Figure 5 Left view of the U-shaped heat exchange tube structure

[0023] Figure 6 Schematic diagram of hydrogen storage alloy bulk material. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Example 1

[0028] like Figure 1 , Figure 2As shown, a detachable metal hydride solid hydrogen storage device includes a shell 6, 9, a flange 4, and a blind flange 2. A hydrogen transmission pipe 10 and a flange 11 are welded to the shell 9, and the hydrogen transmission pipe 10 serves as a hydrogen flow channel; a U-shaped heat exchange tube 1 and a temperature measuring sheath tube 13 are welded to the blind flange 2, and the U-shaped heat exchange tube 1 serves as a cold and hot water flow channel; an annular fin 14 and end plates 3, 8 are welded to the U-shaped heat exchange tube 1, and an outer protective plate 5 is welded to the end plates 3, 8. The outer protective plate 5 is connected above by a filter screen, and is filled with a hydrogen storage alloy 17. Hydrogen enters the device through the hydrogen transmission pipe 10 and diffuses into the hydrogen storage alloy 17 through the filter screen 12 to complete the hydrogen absorption process; the hydrogen inside the hydrogen storage alloy 17 is desorbed by heat, diffuses into the interlayer through the filter screen 12, and is released through the hydrogen transmission pipe 10. The specific design of the U-shaped heat exchange tube 1 is as follows: Figure 4 As shown, each U-shaped heat exchange tube 1 has a connecting section 15 and a connecting section 16. During the hydrogen absorption process, cooling water flows in from the top through the connecting section 15; during the hydrogen release process, heating water flows in from the bottom through the connecting section 16, thereby achieving the need for maximally enhancing heat exchange.

[0029] The connecting pipes 15 and 16 are welded to the U-shaped heat exchange tube 1, and the welding points are located outside the hydrogen storage device, avoiding the risk of leakage at the welding points due to long-term use. The front end of the connecting pipe is provided with an external thread for connecting to the water tank hose. Before the hydrogen absorption process begins, cooling water must first be introduced into the U-shaped heat exchange tube 1 through the connecting pipe 15 for pre-cooling, and then hydrogen is introduced through the hydrogen delivery pipe 10 under the condition of continuous introduction of cooling water. The hydrogen fills the interlayer in turn and gradually diffuses into the hydrogen storage material through the filter 12. At this time, the hydrogen absorption process occurs. At that time, the cooling water carries part of the heat of the hydrogen absorption reaction and the temperature rises. After sufficient heat exchange through the U-shaped heat exchange tube, it flows to the connecting pipe 16, and then returns to the water tank through the connected hose.

[0030] Before the hydrogen release process begins, heating water is first introduced into the U-shaped heat exchange tube 1 through the connecting pipe 16 for preheating. Then, under the condition of continuous introduction of heating water, the metal hydride is thermally decomposed and hydrogen is desorbed. At this time, the external valve of the hydrogen transmission pipe 10 is opened, and the hydrogen storage device is able to release hydrogen outward under a certain back pressure. At that time, the heating water carries heat and is absorbed by the metal hydride, the temperature is reduced, and after sufficient heat exchange through the U-shaped heat exchange tube, it flows to the connecting pipe 15, and then returns to the water tank through the connected hose.

[0031] After several cycles of hydrogen absorption and desorption, the hydrogen storage material in the packaging device needs to be replaced. The specific operation is to introduce inert protective gas to 3MPa into the hydrogen storage device through the hydrogen delivery pipe 10, and pump it outward to the vacuum limit through the vacuum pump and continue for 2 hours. Repeat the operation three times until the hydrogen in the device is completely discharged from the tank. At this time, the flange 4 and the blind flange 2 are disassembled by bolts, the filter 12 is disassembled, cleaned and dried, the outer protective plate 5 is inverted, and the original hydrogen storage material with degraded performance in the hydrogen storage device is removed. Then, new hydrogen storage material is added, and the filter 12 is installed in turn, and the flange 4 and the blind flange 2 are reconnected by bolts. The filling is completed.

[0032] The outer shells 6 and 9 are covered with heat-insulating materials to isolate the heat exchange between the tank and the outside world, so that the temperature inside the device is closer to the temperature of cold / hot water.

[0033] In practical applications, the detachable metal hydride solid hydrogen storage device of this embodiment can achieve the following functions:

[0034] Hydrogen absorption: The first stage of hydrogen absorption is completed by using a hydrogen cylinder to pass through a pressure reducing valve into the pipeline system, and then into the metal hydride solid hydrogen storage device through a hydrogen transmission pipe. Since the hydrogen absorption process is a reversible chemical reaction that generates a large amount of heat in the forward direction, if it is not discharged in time, it will affect the further hydrogen absorption process of the hydrogen storage material. At this time, by controlling the water channel, a certain flow of cooling water is introduced into the U-shaped heat exchange tube. The heat generated inside the hydrogen storage material is transferred to the heat exchange tube wall through the scattered aluminum annular fins, and then taken away by the cooling water in time through convection heat transfer, thereby reducing the temperature inside the device and continuing the hydrogen absorption reaction. After a period of time, the hydrogen storage material in the device is gradually filled with hydrogen, and the hydrogen absorption reaction stops.

[0035] Hydrogen release: Taking advantage of the fact that heating can reverse the above-mentioned reversible chemical reaction, a certain flow of heating water is introduced into the U-shaped heat exchange tube by controlling the water path. The heat carried by the heating water is evenly transferred to the interior of the hydrogen storage material through convection and conduction. At this time, the hydrogen storage material is a metal hydride that is fully absorbed by hydrogen. It will decompose when heated and continuously desorb hydrogen. Under certain back pressure conditions, the desorbed hydrogen can be released through the hydrogen transmission pipe. After a period of time, the hydrogen release reaction stops, and the hydrogen stored in the material is almost released. From then on, a cycle of hydrogen absorption and desorption reaction process ends.

[0036] Material replacement: After a period of continuous hydrogen absorption and desorption cycles, open the flange and remove the inner tank, clean and dry it, pour out the old material and fill it with new material, then install the filter in turn and reseal it, and then you can continue to use it.

[0037] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0038] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0039] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A detachable metal hydride solid hydrogen storage device, characterized in that: include, A shell (9), a flange (4), and a blind flange (2); a hydrogen delivery pipe (10) and a flange (11) are welded to the shell (9); the hydrogen delivery pipe (10) serves as a hydrogen flow passage; a U-shaped heat exchange tube (1) and a temperature measuring sheath tube (13) are welded to the blind flange (2); the U-shaped heat exchange tube (1) serves as a cold and hot water flow passage.

2. The detachable metal hydride solid hydrogen storage device according to claim 1, characterized in that: The U-shaped heat exchange tube (1) is welded with an annular fin (14) and an end plate (3), and the end plate (3) (8) is welded with an outer protective plate (5).

3. The detachable metal hydride solid hydrogen storage device according to claim 2, characterized in that: The outer protective plate (5) is connected above by a filter screen (12), the outer protective plate (5) is filled with a hydrogen storage alloy (17), and hydrogen is introduced into the device through the hydrogen transmission pipe (10).

4. The detachable metal hydride solid hydrogen storage device according to claim 3, characterized in that: The hydrogen passing through the hydrogen transmission pipe (10) diffuses into the hydrogen storage alloy through the filter (12), completing the hydrogen absorption process; the hydrogen inside the material is desorbed by heat, diffuses into the interlayer through the filter (12), and is released through the hydrogen transmission pipe (10).

5. The detachable metal hydride solid hydrogen storage device according to claim 4, characterized in that: The temperature measuring sheath tube (13) is fixed to the flange (4) by welding, and the temperature measuring sheath tube (13) is buried in the hydrogen storage material.

6. The detachable metal hydride solid hydrogen storage device according to claim 5, characterized in that: A temperature sensor is arranged inside the temperature measuring sheath tube (13).

7. The detachable metal hydride solid hydrogen storage device according to claim 6, characterized in that: The U-shaped heat exchange tube is a 304 stainless steel seamless tube.

8. The detachable metal hydride solid hydrogen storage device according to claim 7, characterized in that: The exterior of the shell (9) is provided with a heat-insulating layer.

9. The detachable metal hydride solid hydrogen storage device according to claim 8, characterized in that: A fixing bracket is provided at the lower part of the housing (9).

10. The detachable metal hydride solid hydrogen storage device according to claim 9, characterized in that: A special sealing gasket is provided between the flange (4) and the blind flange (2).

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