Large-diameter hydrogen storage alloy tank and manufacturing method thereof

Abstract

The invention relates to a large-diameter hydrogen storage alloy tank and a manufacturing method thereof. The large-diameter hydrogen storage alloy tank comprises a steel bottle body, a heat exchanger, annular porous mass transfer modules, a gas-guide tube, a metal filter disc and a high-pressure high vacuum valve, wherein the outer diameter of the steel bottle body is phi 159-600mm and the length is 1500-5100mm; the heat exchanger is a copper or stainless steel seamless tube and is bent into multi-channel pipelines in parallel with the axis of the steel cylinder, wound into an annular structure concentric with the steel cylinder cross section and then placed in the steel cylinder; the annular porous mass transfer modules are of an aluminum or copper porous or fibre structure which is composed of multiple annular structures with different sizes and are respectively placed between the inner wall of the steel cylinder body and the heat exchanger, among different diameter rings of the heat exchanger and into an annular space between the inner layer heat exchanger and the gas-guiding tube; the hydrogen storage alloy powder can be filled in the annular porous mass transfer modules; the gas-guiding tube is placed at the central axis of the steel cylinder; and the metal filter is connected with the steel cylinder body through braze welding. The invention has the advantages of simple and convenient production process, good consistency, being convenient for mechanization operation and realizing mass production and the like.

Description

technical field [0001] The invention belongs to the hydrogen storage technology in the field of hydrogen energy, and in particular relates to a hydrogen storage alloy tank for a fuel cell power supply and a manufacturing method thereof. Background technique [0002] Hydrogen energy has many advantages such as cleanliness, high efficiency, and renewability, and is a new type of energy that has attracted widespread attention from all over the world. As a typical representative of hydrogen energy applications, hydrogen fuel cells have many advantages such as long backup time, high efficiency, environmental protection, small size, and light weight. They have shown good application prospects in the fields of transportation, distributed power generation, and backup power. [0003] Fuel cell power generation requires large amounts of hydrogen fuel. At present, there are three main methods of practical hydrogen storage and transportation, namely, high-pressure containers (mainly st...

AI Technical Summary

Problems solved by technology

Due to the poor heat transfer performance of hydrogen storage alloy powder, which is almost equivalent to that of glass, the radial thickness of large-diameter hydrogen storage alloy tanks is relatively large, and it is obviously difficult to meet the heat demand of large-flow continuous hydrogen release only by the heat conduction of alloy powder. The hydrogen storage alloy bed is equipped with a certain length of heat exchange tubes to improve heat exchange efficiency

At the same time, most of the existing hydrogen storage alloy tanks directly fill the hydrogen storage alloy powder into the hydrogen storage tank, and vibrate through manual or mechanical vibration. It is difficult to ensure the uniformity of the alloy powder filling in the tank, and as the alloy powder During the process of hydrogen absorption and desorption, the powder is pulverized, and the fine powder gradually gathers, resulting in hardening and local stress concentration, which reduces the mass transfer performance of the hydrogen storage alloy tank, and is prone to local uneven deformation, reducing the service life of the hydrogen storage alloy, and even causing damage to the tank body. Serious accidents such as failure and rupture

ZL200320126461.0 discloses a structure with an inner spiral heat exchange tube. Although the heat exchange efficiency of the hydrogen storage alloy tank is improved, the heat transfer in the radial direction of the bed still mainly depends on the heat conduction of the hydrogen storage alloy powder. Efficiency is difficult to meet the requirements of continuous operation of kilowatt-level fuel cells for large flow and long-term stable hydrogen supply

At the same time, the spiral heat exchange tube makes the internal structure of the tank complex, and it is difficult to evenly fill the hydrogen storage alloy powder, which is prone to hardening and stress concentration, and its safety and reliability will be greatly reduced

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