A metal hydride hydrogen storage tank with a helical structure

Abstract

The invention discloses a metal hydride hydrogen storage tank with a spiral structure. The metal hydride hydrogen storage tank comprises a tank body, an air guide pipe, a spiral structure part, a hydrogen storage alloy powder and the like. The metal hydride hydrogen storage tank has the advantages that by arranging the spiral structure part in the tank body, firstly, the heat transfer of a hydrogen storage alloy powder bed in the metal hydride hydrogen storage tank is effectively enhanced, and the hydrogen charging / discharging property of the metal hydride hydrogen storage tank is improved; then, when the hydrogen storage alloy powder is loaded and filled, the hydrogen storage alloy powder is sufficiently and uniformly loaded and filled by using the spiral structure part, and the spiral structure part is used for fixing and supporting the hydrogen storage alloy powder in the use process of the metal hydride hydrogen storage tank, so that the local gathering of the hydrogen storage alloy powder is prevented, the excessive plastic deformation and even breaking due to overlarge local stress of the metal hydride hydrogen storage tank are avoided, the safety of the metal hydride hydrogen storage tank is improved, and the service life of the metal hydride hydrogen storage tank is prolonged.

Description

technical field [0001] The invention belongs to the technical field of hydrogen energy storage, and in particular relates to a metal hydride hydrogen storage tank with a helical structure. Background technique [0002] At present, with the intensification of the energy crisis and the strengthening of environmental protection awareness, the utilization of hydrogen energy has attracted more and more attention, and the storage of hydrogen is one of the main technical bottlenecks in the practical process of hydrogen energy. [0003] There are mainly three kinds of practical hydrogen storage methods in the prior art: hydrogen storage in high-pressure containers (such as steel cylinders), low-temperature liquid hydrogen storage tanks (low-temperature Dewar tanks), and solid-state hydrogen storage in metal hydrides. Among them, the metal hydride solid-state hydrogen storage technology uses the reaction of hydrogen and hydrogen storage alloy to realize the storage of hydrogen. Compa...

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Problems solved by technology

[0005] 1) The pulverization of the hydrogen storage alloy affects the heat transfer performance of the hydrogen storage tank

The hydrogen storage alloy generates a lot of heat when absorbing hydrogen, and needs to absorb a large amount of heat from the outside when releasing hydrogen, and the temperature seriously affects the hydrogen absorption / desorption rate of the hydrogen storage alloy; The expansion / shrinkage of the crystal lattice causes the pulverization of the hydrogen storage alloy. After pulverization, the heat transfer performance of the hydrogen storage alloy is extremely poor (the effective thermal conductivity is about 1W / m / K), which makes the metal hydride hydrogen storage tank The heat transfer of the internal hydrogen storage alloy powder bed is one of the main factors affecting the performance of the hydrogen storage tank

[0006] 2) Local accumulation of hydrogen storage alloy powder can easily lead to safety accidents of hydrogen storage tanks

Under the action of hydrogen storage alloy expansion / shrinkage and gravity, the hydrogen storage alloy powder will gradually settle, which will cause the hydrogen storage alloy powder to accumulate in certain parts of the hydrogen storage tank, and the accumulated hydrogen storage alloy expands when absorbing hydrogen Great stress will be applied to the tank body, which will cause excessive plastic deformation or even rupture of the tank body, causing safety accidents

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