Metal hydride hydrogen storage and fuel cell combined system

Abstract

The invention belongs to the technical field of standby power source systems of mobile phone signal substations, and particularly relates to a metal hydride hydrogen storage and fuel cell combination system. The combination system comprises a fuel cell system, a metal hydride hydrogen storage system and a water electrolysis hydrogen production system. A metal hydride hydrogen storage tank is arranged in a heat exchange chamber communicated with an exhaust pipeline. When a fuel cell works, the metal hydride hydrogen storage tank heats hydrogen storage alloy powder through hot air exhausted out of the fuel cell to release hydrogen, it is guaranteed that the hydrogen storage alloy powder is located in an effective hydrogen releasing temperature area, and therefore the effective hydrogen releasing amount is made to be the maximum. After hydrogen is introduced into the heat exchange chamber and air cooled by the hydrogen storage alloy powder is fully mixed with fresh air, the air is cyclically provided for the fuel cell, and therefore the cooling performance of the fuel cell can be improved. The method is not limited to an air cooling type fuel cell system, and can be applied to a water cooling type fuel cell system.

Description

technical field [0001] The invention belongs to the technical field of backup power systems, in particular to a metal hydride hydrogen storage and fuel cell combined system. Background technique [0002] The fuel cell system used for emergency power generation of mobile phone signal base stations generally adopts proton exchange membrane fuel cells. The fuel cell body of this fuel cell system is usually fuel obtained by stacking multiple minimum structural units called single cells battery stack. A general fuel cell includes an anode that provides hydrogen and a cathode that provides oxygen, respectively. Hydrogen is converted into active hydrogen atoms in the catalyst on the surface of the electrolyte membrane on the anode side, and further releases electrons to convert hydrogen ions. The reaction is expressed as follows: [0003] h 2 →2H + +2e (Formula 1) [0004] Hydrogen ions migrate from the anode side through the electrolyte membrane to the cathode, while electrons...

AI Technical Summary

Problems solved by technology

However, the technologies disclosed in the above-mentioned patent documents are mainly designed for vehicle-mounted fuel cell systems, which use too many power-consuming devices and are not suitable for base station emergency backup power systems. In addition, the different selection criteria for hydrogen storage alloys also lead to suitable design For example, the hydrogen storage system in the patent literature mainly uses light-weight Mg-based hydrogen storage alloys, and the required hydrogen depletion temperature of 300 ° C is the time required for heating up and the additional energy consumption for the emergency power fuel cell system used in base stations. It is not applicable to the fuel cell backup power system of the base station in the state of emergency power failure

The anti-poisoning performance of hydrogen storage alloys has not been considered in the patent literature, and the design of using coolant as a heat transfer medium has a greater risk of poisoning hydrogen storage alloy gas tanks that have been shut down for a long time without unmanned monitoring and require emergency start-up work

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