Carbon dioxide near-zero emission composite fuel cell power generation system and power generation method thereof

Abstract

The invention discloses a carbon dioxide near-zero emission composite fuel cell power generation system and a power generation method thereof. The system comprises a solid oxide fuel cell, a molten carbonate fuel cell, a water gas reaction unit and a carbon dioxide compression unit, wherein a cathode gas outlet of the solid oxide fuel cell is connected with a cathode gas inlet of the molten carbonate fuel cell; a cathode tail gas outlet of the molten carbonate fuel cell is connected with a gas inlet of the water gas reaction unit, the water gas reaction unit is connected with the carbon dioxide compression unit, and the carbon dioxide compression unit is used for compressing carbon dioxide to realize storage of the carbon dioxide; by adopting the composite fuel cell, the performance and the power generation efficiency of the cell stack are improved, and near-zero emission of carbon dioxide is realized.

Description

technical field [0001] The invention relates to the technical field of high-temperature fuel cell power generation, in particular to a composite fuel cell power generation system with near-zero emission of carbon dioxide and a power generation method thereof. Background technique [0002] With the international requirements on the use of energy and carbon dioxide emissions, technologies in the global low-carbon energy field have been continuously developed, and power generation technologies with high efficiency and carbon dioxide capture have continuously entered people's field of vision. The characteristics of high-temperature fuel cell power generation technology (solid oxide fuel cell (SOFC) and molten carbonate fuel cell (MCFC)) meet the requirements of lower carbon emissions and higher power generation efficiency, and have gained certain advantages in distributed power generation. application. [0003] At present, the application of high-temperature fuel cells is mainl...

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Problems solved by technology

[0003] At present, the application of high-temperature fuel cells is mainly based on a single high-temperature fuel cell, such as solid oxide fuel cell power generation or molten carbonate fuel cell power generation. The two fuel cell power generation technologies have different characteristics. Solid oxide fuel cell power generation efficiency High, but the capacity expansion ability is weak; while the molten carbonate fuel cell capacity is easy to expand, and carbon dioxide can be captured in the anode tail gas to reduce carbon emissions

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