Modular solid oxide fuel cell system

Abstract

The invention provides a modular solid oxide fuel cell system. The system comprises a gas supply module, a waste heat recovery module, a galvanic pile module, a tail gas combustion module, a heat pipe module, an energy storage module, and a temperature detection and control module; a load module, the gas supply module, the waste heat recovery module and the galvanic pile module are connected in sequence; the output end of the galvanic pile module is connected with the tail gas combustion module; the heat pipe module is connected with a heat storage module and the galvanic pile module, the energy storage module is connected with the galvanic pile module, the output end of the heat pipe module is connected with the waste heat recovery module, and the waste heat recovery module exchanges heat with supplied gas of the gas supply module through a heat exchanger. The load module is responsible for tracking external load changes and transmitting load signals to the control module. According to the invention, redundant heat is stored by using the energy storage system, the temperature nonuniformity in a stack is reduced, and the service life of the SOFC is prolonged. A load tracking and electric pile sub-module in the load module and a lithium ion battery are used for carrying out quick load response, so that the stability and the reliability of an electric pile are improved.

Description

technical field [0001] The present invention relates to the technical field of fuel cell systems, in particular to a modular solid oxide fuel cell system. Background technique [0002] Solid oxide fuel cells (SolidOxideFuelCell) use oxide ion conductors as electrolytes, prepare electrodes on both sides, supply fuel gas on the anode side, and supply oxidants (air, oxygen, etc.) on the other cathode side, at a higher temperature. Fuel cells that generate electricity. In this SOFC, oxygen ions react with fuel through a solid electrolyte with ionic conductivity to generate water vapor or carbon dioxide, and simultaneously generate electrical and thermal energy. [0003] Compared with lithium batteries, SOFC has the advantages of high energy density and long battery life, and has unique application prospects in the field of mobile portable power sources such as on-site charging, remote power supply and auxiliary power supply. Compared with other types of fuel cells, solid oxide...

AI Technical Summary

Problems solved by technology

[0004] Compared with the fixed power generation system, the load of the mobile SOFC system changes more frequently, and it needs to be started and stopped frequently, and the load is changed. Therefore, various operating conditions need to be frequently and dynamically changed, which will significantly affect the performance and life of the SOFC system.

Specifically, mobile SOFC systems, including but not limited to vehicle-mounted, marine or portable applications, have the following problems: solid oxide fuel cells need to generate electricity at a high temperature of 600°C to 800°C, and self-heating reaches the operating temperature, while for 1000W or less For mobile and portable systems, it is necessary to quickly raise the temperature of the battery stack to above 600°C to meet the requirements of battery operation. At present, for this process, the exhaust gas in the system is ignited and burned to heat the battery stack, but this method is not suitable for batteries. The temperature gradient of the stack is large, which can easily lead to electrolyte membrane damage and fuel cell life decay, and it takes 60 minutes to heat up to 600°C, and the start-up time is too long

At the same time, compared with the fixed power generation system, the load of the portable SOFC system changes more frequently, and it needs to be started and stopped frequently, and the load is changed. Therefore, various operating conditions need to be frequently and dynamically changed, which will significantly affect the performance and life of the SOFC system.

[0005] It can be seen that the impact resistance of SOFC is poor at present, and the problems of performance attenuation and long-term operation life attenuation when the temperature gradient is large have yet to be resolved.

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