Metal hydride hydrogen storage tank based on phase change heat storage and solid-gas coupling hydrogen storage system

Abstract

The invention relates to a metal hydride hydrogen storage tank based on phase change heat storage and a solid-gas coupling hydrogen storage system. A main body of the vertical metal hydride hydrogen storage tank is composed of an outer-layer tank and an inner-layer tank, a first phase change material is arranged in an interlayer, the inner-layer tank is filled with metal hydride and a second phase change material, and the metal hydride is arranged between the first phase change material and the second phase change material. And a cavity is reserved at the upper part of the inner-layer tank as a hydrogen buffer area and borders the metal hydride. The contact surfaces of the first and second phase change material areas and the metal hydride are inclined curved surfaces with certain curvature, so that the melting completion time of the inner-layer phase change material and the outer-layer phase change material is consistent, and the overall hydrogen storage rate is increased. The invention further provides a hydrogen storage system combining solid hydrogen storage and gas hydrogen storage, complementation of the hydrogen storage rate, hydrogen storage pressure and hydrogen storage space is achieved, the volume energy density and safety of the hydrogen storage system are improved, and the hydrogen storage system has good prospects when applied to a distributed power generation system or other portable energy supply systems.

Description

technical field [0001] The invention belongs to the technical field of phase-change heat storage and hydrogen storage, and in particular relates to a vertical metal hydride hydrogen storage tank and a solid-gas coupled hydrogen storage system. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] For stationary or mobile hydrogen storage occasions, most of them use gaseous hydrogen storage or liquid hydrogen storage. Among them, gaseous hydrogen is often stored in high-pressure gas cylinders, and its storage pressure is generally 35MPa and 70MPa, while the storage pressure of liquid hydrogen is higher. In order to achieve the storage pressure, gaseous hydrogen storage or liqu...

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Problems solved by technology

However, the traditional metal hydride hydrogen storage system based on phase change heat storage technology has many defects. First, the hydrogen storage rate of metal hydride is low. The main reason is that the heat exchange area in the hydrogen storage structure is small, mostly internal The double-layer structure is filled with metal hydride and externally filled with phase change materials; secondly, due to the low thermal conductivity of most phase change materials, the hydrogen storage rate is greatly reduced in the later stage of the hydrogen storage process, which greatly limits this The wide application of hydrogen storage methods; moreover, for the traditional vertical metal hydride hydrogen storage system with phase change materials, due to the action of gravity, the phase change materials will have uneven distribution of melting state under the action of natural convection, The problem that the phase change material on the upper part of the hydrogen storage tank melts first and then on the lower part

As shown in Figure 1, the time spent in the hydrogen storage process Mainly limited by the later stages of the hydrogen storage process; finally, due to the low thermal conductivity of the phase change material, the volume of a single metal hydride hydrogen storage tank should not be too large, it is not suitable for large-capacity storage, and the scope of application is limited

Therefore, the hydrogen storage capacity of a single metal hydride hydrogen storage tank is difficult to meet the needs of hydrogen storage or hydrogen use equipment. solutions or conduct related research

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