CN-116557757-B - Stirring type metal hydride hydrogen storage device and operation method thereof

CN116557757BCN 116557757 BCN116557757 BCN 116557757BCN-116557757-B

Abstract

The invention discloses a stirring type metal hydride hydrogen storage device and an operation method thereof, wherein the device comprises a cylindrical reaction container and an outer shell, the reaction container is arranged in the outer shell, a closed heat exchange fluid is formed between the reaction container and the outer shell, a stirrer is arranged on the axial line in the reaction container and consists of a rotating shaft and blades, the interior of the rotating shaft is of a hollow structure, the hollow structure forms a flow channel of a heat exchange fluid, the bottom end of the rotating shaft is communicated with the cavity, and the interior of the reaction container is filled with metal hydride.

Inventors

GAO MING
CHEN ZEQI
DAI HUI
WANG YUHANG

Assignees

山东大学

Dates

Publication Date: 20260505
Application Date: 20230309

Claims (6)

1. The operation method of the stirring type metal hydride hydrogen storage device is characterized by comprising a cylindrical reaction container and an outer shell, wherein the reaction container is arranged in the outer shell, and a closed heat exchange fluid is formed between the reaction container and the outer shell; the stirrer is arranged on the axial line in the reaction vessel and consists of a rotating shaft and blades, the inside of the rotating shaft is of a hollow structure, the hollow structure forms a flow channel of a fluid exchange body, and the bottom end of the rotating shaft is communicated with the fluid exchange body; The rotating shaft extends out of the reaction container, and a shaft seal is arranged at the contact position of the rotating shaft and the reaction container; the top end of the rotating shaft is a heat exchange fluid inlet, the bottom end of the rotating shaft is a heat exchange fluid outlet, and the heat exchange fluid outlet of the rotating shaft is simultaneously used as a heat exchange fluid inlet of a heat exchange fluid chamber; the rotating shaft and the blades of the stirrer are made of high-heat-conductivity metal, and the wall surface of the reaction vessel is made of high-heat-conductivity metal; The method comprises the following steps: The stirrer is continuously rotated in the temperature rise stage of the hydrogen absorption reaction, when the temperature reaches the highest value during the hydrogen absorption, the stirrer stops running, when the temperature of the metal hydride close to the heat exchange surface is reduced and the reaction rate is increased, the stirrer is rotated again until the metal hydrides with different temperatures and reaction rates complete circulation or mixing in the reaction container, rotation is stopped, and the rotation and the stop are circularly performed according to the rule until the reaction is complete; The method comprises the steps of continuously rotating a stirrer in a temperature drop stage of the hydrogen release reaction, stopping operating the stirrer when the temperature reaches the minimum when the hydrogen is released, rotating the stirrer again when the temperature of the metal hydride close to a heat exchange surface is increased and the reaction rate is increased until the metal hydrides with different temperatures and the reaction rates are circulated or mixed in a reaction container, stopping rotating, and circularly rotating and stopping according to the rule until the reaction is complete.
2. The method of operating a stirred metal hydride hydrogen storage device of claim 1, wherein said heat exchange fluid has two heat exchange fluid outlets disposed in an upper portion thereof, the two heat exchange fluid outlets being symmetrically disposed.
3. The method of operating a stirred metal hydride hydrogen storage device of claim 1, wherein the top of said reaction vessel is further provided with a hydrogen inlet and outlet.
4. The method of operating a stirred metal hydride hydrogen storage device of claim 1, wherein said shaft is connected to a low speed motor by a transmission employing bevel gears.
5. The method of operating a stirred metal hydride hydrogen storage device of claim 1, wherein the metal hydride is filled in an amount of from 60% to 80% of the volume of the reaction vessel.
6. The method of operating a stirred metal hydride hydrogen storage device of claim 1, in which said outer housing comprises an outer wall surface of a heat exchange fluid and a thermally insulating material.

Description

Stirring type metal hydride hydrogen storage device and operation method thereof Technical Field The invention relates to the technical field of hydrogen storage, in particular to a stirring type metal hydride hydrogen storage device and an operation method thereof. Background At present, three hydrogen storage schemes of high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage and solid hydrogen storage mainly exist. The low-temperature liquid hydrogen storage is characterized by high energy consumption, low temperature maintenance, low economical efficiency and high requirement on the heat insulation of a container, and solid hydrogen storage, especially solid hydrogen storage based on metal hydride, has the advantages of low hydrogen storage pressure, high hydrogen storage density, good hydrogen storage safety, high hydrogen purity and the like, and is an important development direction of future hydrogen storage technology. The existing solid-state hydrogen storage system mainly removes heat released in the hydrogen absorption process and heat required in the hydrogen release process as soon as possible through heat exchange arrangement of embedding a heat exchange tube bundle, a heat exchange tube with fins, a designed heat exchange channel, a heat exchange jacket added outside a hydrogen storage tank and the like in bed materials. The existing embedded fin heat exchanger can well exchange heat with metal hydride in an adjacent area, but the reactant far away from a heat exchange surface has poor heat exchange condition due to low heat conductivity coefficient of the metal hydride, is slightly influenced by the heat exchanger, still cannot react quickly, and ensures that the hydrogen absorption/desorption time is longer. After a plurality of hydrogen storage and release cycles, the metal hydride is pulverized and particles are miniaturized, and the miniaturized metal hydride is deposited at the bottom of the hydrogen storage tank under the action of gravity, so that the effective heat conductivity coefficient of the metal hydride is reduced, and the heat exchange capacity of the hydrogen storage tank is deteriorated. And the tiny metal hydride particles deposited at the bottom of the hydrogen storage tank can expand and generate larger pressure on the inner wall of the reaction vessel in the hydrogen storage and release cycle, and even deform and crack the wall surface. Disclosure of Invention Aiming at the problems existing in the prior art, the invention provides the stirring type metal hydride hydrogen storage device and the operation method thereof, and the stirrer is arranged in the hydrogen storage device, so that the pulverization influence of the metal hydride can be reduced, the hydrogen storage/release performance of the hydrogen storage reactor can be greatly improved, and the reaction time is shortened. The technical scheme of the invention is as follows: In a first aspect of the invention, a stirring type metal hydride hydrogen storage device is provided, which comprises a cylindrical reaction container and an outer shell, wherein the reaction container is arranged in the outer shell, a closed heat exchange fluid is formed between the reaction container and the outer shell, a stirrer is arranged on an axial line in the reaction container and consists of a rotating shaft and blades, the interior of the rotating shaft is of a hollow structure, the hollow structure forms a flow channel of a heat exchange fluid, the bottom end of the rotating shaft is communicated with the cavity, and the interior of the reaction container is filled with metal hydride. In some embodiments of the invention, the rotating shaft extends out of the reaction vessel, and a shaft seal is arranged at the contact position of the rotating shaft and the reaction vessel. In some embodiments of the present invention, the top end of the rotating shaft is a heat exchange fluid inlet, the bottom end is a heat exchange fluid outlet, and the heat exchange fluid outlet of the rotating shaft is simultaneously used as the heat exchange fluid inlet of the heat exchange fluid cavity. In some embodiments of the present invention, the upper portion of the heat exchange fluid chamber is provided with two heat exchange fluid outlets, and the two heat exchange fluid outlets are symmetrically arranged. In some embodiments of the invention, the top of the reaction vessel is also provided with a hydrogen inlet and outlet. In some embodiments of the present invention, the rotating shaft is provided with an upper helical blade and a lower helical blade, and the angle between the upper helical blade and the axis of the rotating shaft is smaller than the angle between the lower helical blade and the axis of the rotating shaft. In some embodiments of the invention, the shaft is coupled to a low speed motor via a transmission that uses bevel gears. In some embodiments of the invention, the metal hydride is filled in an amoun