High-temperature fuel cell system and operating method thereof

Abstract

The invention provides a high-temperature fuel cell system and an operating method thereof. The high-temperature fuel cell system comprises a high-temperature fuel cell pile and a heat conducting oilpre-heater; a first heat conducting oil flowing channel with an inlet and an outlet is formed in the heat conducting oil pre-heater; a second heat conducting oil flowing channel is formed in a single-cell bipolar plate; a closed heat conducting oil loop is formed after the first heat conducting oil flowing channel communicates with the second heat conducting oil flowing channel; a fluid flowing driving part and a flow adjusting part are arranged on the closed heat conducting oil loop. The operating method comprises the following steps: heating the heat conducting oil pre-heater through a firstheating device; heating the high-temperature fuel cell pile through heated heat conducting oil; detecting the temperature of the high-temperature fuel cell pile in real time through a pile temperature detecting part; when the temperature of the pile reaches a preset value T1, starting the high-temperature fuel cell pile. According to the high-temperature fuel cell system and the operating methodthereof, the problem of non-uniform heating caused by electric heating during a starting process of a fuel cell can be solved effectively.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a high-temperature fuel cell system with a preheating function. Background technique [0002] A fuel cell is a device that converts chemical energy stored in compound fuels directly into electrical energy through a chemical reaction. A proton exchange membrane fuel cell usually consists of an anode, a cathode and a proton exchange membrane. During the operation of the battery, the fuel undergoes an oxidation reaction on the surface of the anode catalyst to generate protons and electrons. The protons reach the cathode through the proton exchange membrane, oxygen undergoes a reduction reaction with the protons on the surface of the cathode catalyst to generate water, and the electrons do work through the external circuit to reach the cathode. [0003] During the start-up process of a high-temperature fuel cell system, the battery stack needs to be heated to the operating temper...

AI Technical Summary

Problems solved by technology

[0003] During the start-up process of a high-temperature fuel cell system, the battery stack needs to be heated to the operating temperature before the battery can be discharged. However, due to its high operating temperature, the uniform and efficient heating of the battery stack has an important impact on the performance and life of the fuel cell stack. However, the traditional electric heating method will cause a large difference in the internal temperature of the battery stack during the start-up process of the high-temperature fuel cell, which will accelerate the mechanical aging of the material, thereby affecting the performance and life of the high-temperature fuel cell system.

[0004] However, during the operation of the high-temperature fuel cell system, since the system emits a large amount of heat when operating at high power, the traditional fan cooling method will cause problems such as the limited performance of the fan itself and the serious loss of phosphoric acid in the battery due to excessive air volume. The system cannot dissipate heat effectively or the performance degrades sharply

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