High-temperature fuel cell stack, fuel cell system, and system control method

Abstract

A high-temperature fuel cell stack, including N single cells and M fuel processing units; wherein M and N are both natural numbers; the N single cells and M fuel processing units are closely attached to form a high-temperature fuel cell stack; A fuel reforming reaction catalyst is set in the fuel processing unit; the reaction product of the fuel processing unit is the anode fuel of the single cell, and the reaction product outlet of the fuel processing unit is connected to the anode of the single cell The fuel inlets are connected; the single battery includes the electrolyte membrane in the membrane electrode, which is an electrolyte membrane with a maximum temperature resistance of 150°C-250°C. The above-mentioned control method enables the high-temperature fuel cell system to operate under stable conditions, avoiding low battery performance caused by too low temperature during operation and damage to the sintering machine MEA performance of the catalyst in the reformer caused by too high temperature, The fuel pretreatment device in the optimized solution of the present invention increases the reforming rate of the fuel and makes the operating conditions of the battery more stable.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a high-temperature fuel cell stack; the invention also relates to a fuel cell system including the above-mentioned fuel cell stack and a control method for the system. Background technique [0002] A proton exchange membrane fuel cell is a device that directly converts chemical energy stored in compound fuels into electrical energy through an electrochemical reaction. Generally, a proton exchange membrane fuel cell includes an electrolyte membrane and an anode and a cathode separated therefrom. The proton exchange membrane fuel cell uses hydrogen as fuel, generates protons and electrons under the action of the anode catalyst, the protons reach the cathode through the ion exchange membrane, and undergo a reduction reaction with the cathode oxygen on the surface of the cathode catalyst, and the electrons do work through the external circuit and are transferred from t...

AI Technical Summary

Problems solved by technology

For the commonly used methanol external reforming fuel cell system, since the reforming reaction and the fuel cell discharge reaction are placed in different devices, the thermal efficiency of the entire system is low

[0005] 2. Part of carbon monoxide will be produced during the reforming process of methanol. When the concentration of carbon monoxide reaches a certain value, it will poison the anode catalyst of the battery, resulting in a decline in battery performance, which will lead to poor stability of the battery during the entire working process.

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