阅读说明：本技术 使用固态氢气储存材料的热循环氢气储存方法 (Thermal cycling hydrogen storage method using solid hydrogen storage material ) 是由 朴智慧 南东勋 朴训模 李京汶 于 2020-09-07 设计创作，主要内容包括：本申请公开一种通过热循环结构有效地重复使用热量以提高能源效率的氢气储存方法。具体的,该氢气储存方法包括：由供应装置供应氢气；由压缩装置压缩从供应装置接收的氢气；储存装置接收由压缩装置压缩的氢气并将所接收的氢气储存在储存装置中；以及将从储存装置产生的热量传递至压缩装置,其中压缩装置和储存装置分别包括固态氢气储存材料,当储存氢气时固态氢气储存材料发生放热反应并且当释放氢气时固态氢气储存材料发生吸热反应。(Disclosed is a hydrogen storage method for effectively reusing heat through a thermal cycle structure to improve energy efficiency. Specifically, the hydrogen storage method comprises the following steps: supplying hydrogen from a supply; compressing, by a compression device, the hydrogen gas received from the supply device; the storage device receives the hydrogen compressed by the compression device and stores the received hydrogen in the storage device; and transferring heat generated from the storage device to the compression device, wherein the compression device and the storage device respectively include a solid hydrogen storage material that undergoes an exothermic reaction when storing hydrogen and an endothermic reaction when releasing hydrogen.)

1. A hydrogen storage method comprising:

supplying hydrogen from a supply;

compressing, by a compression device, the hydrogen gas received from the supply device;

a storage device that receives the hydrogen gas compressed by the compression device and stores the received hydrogen gas in the storage device; and

transferring heat generated from the storage device to the compression device;

wherein the compression device and the storage device each comprise a solid-state hydrogen storage material that undergoes an exothermic reaction when storing hydrogen and an endothermic reaction when releasing hydrogen.

2. The method of claim 1, wherein,

the supply means supplies hydrogen gas at a pressure of two to eight bars.

3. The method of claim 1, wherein,

the solid hydrogen storage material comprises a chemical formula MH_xA compound of (a);

wherein M is selected from Mg, BaRe, KB, NaAl, NaB, Li, LiN, LiB, Mg₂Ni、LaNi₅、FeTi、FeMn₂、NH₃B and N, and x is 0.9 to 10.

4. The method of claim 1, wherein,

the compression device releases hydrogen stored in the solid hydrogen storage material into a confined space, thereby compressing the hydrogen to at least 10 bar.

5. The method of claim 1, wherein,

heat exchange is performed between the compression device and the storage device by a fluid flowing through a closed flow circuit installed between the compression device and the storage device.

6. The method of claim 5, wherein,

heat generated when hydrogen is stored in the storage device is transferred to the compression device through the fluid, and the transferred heat causes hydrogen to be released from the solid hydrogen storage material of the compression device.

7. The method of operation of claim 5, further comprising:

transferring heat generated by the compression device when storing hydrogen in the compression device to the storage device via the fluid, releasing hydrogen from the solid hydrogen storage material of the storage device.

Technical Field

The present disclosure relates to a hydrogen storage method for reusing heat generated from a hydrogen compressor including a solid-state hydrogen storage material through a thermal cycle structure to improve energy efficiency.

Background

The use of non-renewable fossil energy as an energy source is rapidly increasing due to the acceleration of industrialization. Therefore, non-renewable fossil energy sources risk being exhausted. In addition, the hazardous substances produced during combustion worsen the situation in which the natural environment and the natural ecosystem are threatened.

As a renewable energy source for solving this problem, hydrogen gas can be continuously produced from a large amount of water ubiquitous on the earth. Therefore, there is no need to worry about the exhaustion of the hydrogen raw material. In addition, hydrogen is a clean energy source, which generates little pollutants when burned and is an element that generates water again.

In order to provide this hydrogen as a fuel, a hydrogen storage device is necessary. Three typical methods are mainly used in hydrogen storage devices: a high-pressure gas storage method, a liquid hydrogen storage method and a solid hydrogen storage method.

The high pressure gas storage method is the most common method of storing high pressure gas at 700 bar (bar), but has disadvantages of risk due to low storage density per unit volume and high pressure.

The liquid hydrogen storage method has an advantage of storing a large amount of hydrogen by liquefying the hydrogen. However, there is a disadvantage in that since hydrogen is liquefied at an extremely low temperature, the extremely low temperature should be maintained.

On the other hand, the solid-state hydrogen storage method is a method of storing hydrogen by reacting hydrogen with a solid material for storing hydrogen, and is performed at a relatively lower pressure than the high-pressure gas storage method. In addition, in contrast to the liquid hydrogen storage method, the solid hydrogen storage method is performed at a high temperature rather than an extremely low temperature, and thus the method is relatively easy to perform, and the storage amount of hydrogen is large.

However, in the conventional solid-state hydrogen storage method, a separate heat exchanger for storing hydrogen in or releasing hydrogen from the hydrogen storage material is required. Such a device and process are difficult to implement and have a problem of high manufacturing cost due to the complicated structure.

The foregoing is merely intended to aid in understanding the background of the disclosure and is not intended to imply that the disclosure falls within the scope of the prior art known to those skilled in the art.

Disclosure of Invention

Accordingly, the present disclosure is directed to solving the above-mentioned problems occurring in the prior art, and an object of the present disclosure is to provide a thermal cycle hydrogen storage method that effectively reuses heat through a thermal cycle structure to improve energy efficiency.

The object of the present disclosure is not limited to the above-mentioned object. In addition, the objects of the present disclosure will become more apparent from the following description and will be achieved by the methods described in the claims and the combinations thereof.

According to an aspect of the present disclosure, in order to achieve the above object, there is provided a hydrogen storage method including: providing hydrogen from a supply; compressing, by a compression device, the hydrogen gas received from the supply device; the storage device receives the hydrogen compressed by the compression device and stores the received hydrogen in the storage device; and transferring heat generated from the storage device to the compression device, wherein the compression device and the storage device may each include a solid hydrogen storage material that undergoes an exothermic reaction when storing hydrogen and an endothermic reaction when releasing hydrogen.

The supply means may supply hydrogen at a pressure of more than two bar.

The solid hydrogen storage material may include a compound represented by the following chemical formula 1,

chemical formula 1:

MHx

wherein M is Mg, BaRe, KB, NaAl, NaB, Li, LiN, LiB, Mg₂Ni、LaNi₅、FeTi、FeMn₂、NH₃B and N, and x is 0.9 to 10.

The compression means may release hydrogen stored in the solid hydrogen storage material into a confined space, thereby compressing the hydrogen to at least 10 bar.

Heat exchange between the compression device and the storage device may be performed by a fluid flowing through a closed flow loop installed between the compression device and the storage device.

Heat generated by the storage device as the hydrogen gas is stored in the storage device may be transferred through the fluid to the compression device, and the transferred heat may cause the release of hydrogen gas from the solid hydrogen storage material of the compression device.

The method may further comprise releasing hydrogen from the solid hydrogen storage material of the storage device by transferring heat generated by the compression device when hydrogen is stored in the compression device to the storage device via the fluid.

As described above, the hydrogen storage method according to the present disclosure effectively reuses heat generated during storage and release of hydrogen through thermal cycling between a compression device and a storage device, thereby greatly improving energy efficiency.

The effects of the present disclosure are not limited to the above-mentioned effects. On the contrary, it is to be understood that the effects of the present disclosure include all effects that can be inferred from the following description.

Drawings

Fig. 1 is a diagram schematically illustrating a hydrogen storage system according to the present disclosure.

Detailed Description

The above objects, other objects, features and advantages of the present disclosure will be readily understood by the following illustrative embodiments thereof in connection with the accompanying drawings. However, the present disclosure is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein make the disclosure thorough and complete, and fully convey the concept of the disclosure to those skilled in the art.

In the description of the drawings, like reference numerals are used for like elements. In the drawings, the dimensions of the structures are shown to be larger than actual scale for clarity of disclosure. Terms such as first, second, etc. may be used to describe various components, but the components are not limited by the terms. The term is used only to distinguish one element from another. For example, a first component could be considered a second component, and similarly, a second component could be considered a first component, without departing from the scope of the present disclosure. Singular references include plural references unless the context clearly dictates otherwise.

The terms "comprises," "comprising," "has," "having," and the like, when used in this specification, are intended to specify the presence of stated features, steps, acts, components, parts, or combinations thereof, and are understood not to preclude the presence or addition of at least one of the number, steps, acts, components, parts, or combinations thereof. When an element such as a layer, film, region, plate, or the like, is referred to as being "on" another element, it includes not only the case where one element is directly on the other element, but also the case where another element is present between the two elements. Conversely, when an element such as a layer, film, region, panel, or the like, is referred to as being "under" another element, it includes not only the case where one element is directly under the other element, but also the case where the other element is between the two elements.

Fig. 1 is a diagram schematically illustrating a hydrogen storage system according to the present disclosure; referring to fig. 1, the hydrogen storage system includes: a supply device 10 configured to supply hydrogen gas; a compressing device 20 configured to receive hydrogen gas from the supply device 10 and compress the hydrogen gas to a predetermined pressure; a storage device 30 configured to receive the compressed hydrogen gas from the compression device 20 and store the compressed hydrogen gas; and a heat exchange device 40 configured to include a closed flow circuit so that heat is exchanged between the compression device 20 and the storage device 30.

The supply device 10 may be configured to store and supply hydrogen gas, or configured to generate and supply hydrogen gas. For example, the former configuration may be a hydrogen storage tank, while the latter configuration may be a water electrolysis system or a reforming system.

The compression device 20 may be a general compressor that compresses gas, and a compressor configured to include a solid hydrogen storage material may be used. Specifically, the compression device 20 may include a solid hydrogen storage material as a compound represented by the following chemical formula 1. The hydrogen gas may be pressurized to a predetermined pressure using a compression device 20 including a solid hydrogen storage material, which will be described later.

Chemical formula 1:

MHx

wherein M is selected from Mg, BaRe, KB, NaAl, NaB, Li, LiN, LiB, Mg₂Ni、LaNi₅、FeTi、FeMn₂、NH₃B and N, and x is 0.9 to 10.

The storage device 30 is configured to store hydrogen received from the compression device 20 in a solid hydrogen storage material, or release the stored hydrogen and supply it to a device 50 using it, such as a fuel cell, a vehicle, a hydrogen station. A solid hydrogen storage material is a substance that reacts exothermically when storing hydrogen and endothermically when releasing hydrogen. Therefore, when hydrogen is stored in the solid hydrogen storage material in the storage device 30, the solid hydrogen storage material generates heat. The solid hydrogen storage material of the storage device 30 may include a compound represented by the above chemical formula 1. The solid hydrogen storage material of the storage device 30 may be the same as or different from the solid hydrogen storage material of the compression device 20.

The present disclosure does not dissipate heat released from the solid hydrogen storage material to the outside, but circulates the heat within the hydrogen storage system, thereby improving thermal efficiency. Specifically, a closed flow circuit circulating between the compression device 20 and the storage device 30 is installed, and the heat exchange device 40 is configured to enable a fluid flow carrying heat in the heat exchange device 40, thereby improving thermal efficiency. In addition, as described above, since the compression device 20 also includes the solid-state hydrogen storage material, heat is also generated when hydrogen is stored in the compression device 20. Accordingly, the heat generated from the compression device 20 may be circulated to the storage device 30 and used to release the hydrogen stored in the storage device 30. This will be described in more detail in the hydrogen storage method according to the present disclosure.

The hydrogen storage method using the hydrogen storage system includes: hydrogen gas is supplied from the supply device 10; compressing the hydrogen gas received from the supply device 10 by the compression device 20; the storage means 30 receives the hydrogen gas compressed by the compression means 20 and stores the received hydrogen gas in the storage means 30; and transferring heat generated from the storage device 30 to the compression device 20.

The supply device 10 may be a device that supplies hydrogen gas at a pressure of two bars to eight bars. Since the supply source has a limitation in supplying hydrogen at a high pressure, hydrogen at such a low pressure is generally supplied. Therefore, in order to store the hydrogen gas supplied from the supply device 10, it is necessary to compress the hydrogen gas to a high pressure using the compression device 20.

The compression device 20 is a device containing a solid hydrogen storage material, and in particular, may be a chamber having a predetermined space filled with the solid hydrogen storage material. When a certain amount of heat is applied to the compression device 20, hydrogen gas is released from the solid hydrogen storage material.

In addition, the hydrogen gas supplied from the supply device 10 is introduced into the chamber together with the released hydrogen gas. That is, since hydrogen is filled in a predetermined space, the pressure of hydrogen increases. At this time, the heat required to release hydrogen from the solid hydrogen storage material filled in the compression device 20 uses the heat released from the storage device 30. That is, heat released when storing hydrogen in the solid hydrogen storage material of the storage device 30 is collected by the heat exchange device 40 and transferred to the compression device 20, thereby allowing the heat to circulate within the hydrogen storage system.

The compression device 20 may compress the hydrogen gas to a high pressure of at least 10 bar.

Thereafter, the hydrogen gas compressed by the compression device 20 is supplied to the storage device 30, and the storage device 30 stores the hydrogen gas.

In addition, the hydrogen storage method may further include collecting heat generated upon storage of hydrogen gas by the compression device 20 through the heat exchange device 40 and transferring the heat to the storage device 30 to release the hydrogen gas stored in the solid hydrogen storage material of the storage device 30.

The hydrogen storage method according to the present disclosure allows the compression device 20 and the storage device 30 to be filled with solid hydrogen storage materials, respectively. In addition, when the solid-state hydrogen storage material releases heat or absorbs heat in the process of storing or releasing hydrogen, the hydrogen storage method allows the necessary conditions to be satisfied by appropriately circulating the heat generated in the system, thereby improving thermal efficiency. Hereinafter, this will be described for each case.

First, a method of storing hydrogen gas in the storage device 30 is described. The hydrogen is compressed by the compression means 20 to at least 10 bar and is introduced into the storage means 30. At this time, when hydrogen is stored in the solid hydrogen storage material filled in the storage device 30, heat is generated. Then, the fluid flowing through the closed flow circuit installed between the compression device 20 and the storage device 30 receives the heat released from the storage device 30 and transfers the heat to the compression device 20. In the heat receiving compression device 20, a large amount of hydrogen is released from the solid hydrogen storage material, which can be compressed to a high pressure as described above.

Next, a method of releasing hydrogen gas from the storage device 30 is described. When heat is applied to the storage device 30, hydrogen gas is released from the solid hydrogen storage material. The heat applied to the storage device 30 may be supplied from the compression device 20. Specifically, when the hydrogen stored in the solid hydrogen storage material filled in the compression device 20 is exhausted, the hydrogen must be stored again. That is, when the supply device 10 supplies hydrogen gas at a predetermined pressure to the compression device 20 and the compression device 20 stores the hydrogen gas in the solid hydrogen storage material, heat is released from the solid hydrogen storage material. When the heat of the compression device 20 is absorbed by the fluid flowing through the closed flow circuit and supplied to the storage device 30, the hydrogen gas stored in the storage device 30 may be released.

The present disclosure has been described above in detail. However, the scope of the present disclosure is not limited to the above description, and various modifications and improvements made by those skilled in the art using the basic concept of the present disclosure defined in the appended claims are also included in the scope of the present disclosure.