A low-temperature and medium-high temperature fuel cell combined operation system

Abstract

The invention relates to a low-temperature and medium-temperature fuel cell combined operation system. The low-temperature and medium-temperature fuel cell combined operation system comprises a low-temperature fuel cell stack, a high-medium-temperature fuel cell stack, a hydrogen sharing supply system, an air sharing supply system and a cooling liquid circulating sharing system, wherein the hydrogen sharing supply system, the air sharing supply system and the cooling liquid circulating sharing system are respectively connected to the low-temperature fuel cell stack and the high-temperature fuel cell stack, and the low-temperature and medium-temperature fuel cell combined operation system also comprises a heat exchanger which is arranged in front of the high-medium-temperature fuel cell stack and used for preheating hydrogen and air of the medium-high-temperature fuel cell stack, an air inlet and an air outlet are formed in two ends of the heat exchanger, and the air inlet is respectively connected to air outlets of the low-temperature fuel cell stack and the medium-high-temperature fuel cell stack. Compared with the prior art, the medium and high-temperature fuel cell is heated by utilizing the advantage that the low-temperature fuel cell stack is rapid to start at low temperature so as to prepare for the preheating starting, and the fuel cell combined operation system has the advantages of the medium-temperature fuel cell and the high-temperature fuel cell.

Description

technical field [0001] The invention relates to a new energy technology field, in particular to a low-temperature and medium-high temperature fuel cell combined operation system. Background technique [0002] Proton exchange membrane fuel cell technology is the most important key technology for human beings to utilize hydrogen energy in the 21st century. Many countries have given high attention and strong support to the industrialization of proton exchange membrane fuel cell technology, and made many substantial progress. It is foreseeable that the full industrialization of this technology will have a major impact on the future world energy supply and pattern. In modern social life and economic construction, the importance of power supply and security is becoming more and more important. At the same time, the requirements for improving the efficiency of power production and use and environmental friendliness are constantly increasing. The advantages of distributed power ge...

AI Technical Summary

Problems solved by technology

[0006] It can be seen from the operating characteristics of the above two fuel cells that the low-temperature fuel cell starts quickly, but the generation of liquid water is not conducive to stable operation and has a limited life.

However, medium and high temperature fuel cells require external energy to be heated. When the temperature rises above 100°C to start, the operation is stable after startup, with long life and high reliability. However, low temperature fuel cells produce liquid water and have poor operation stability.

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