Integrated gasification fuel cell power generation system and method utilizing coal water slurry gasification

Abstract

The invention provides an integrated gasification fuel cell power generation system and method utilizing coal water slurry gasification. The integrated gasification fuel cell power generation system comprises a coal preparation unit, a gasification furnace, an exhaust heat boiler, a dedusting unit, a first gas-gas heater, a desulfurizing device, an ejector, a fuel cell, a pure oxygen combustor, a gas turbine, a cathode air compressor, a first waste heat recovery exchanger, a cathode heat regenerator, an air turbine, a steam turbine, a waste heat boiler and a deep cooling air separation unit. The integrated gasification fuel cell power generation system utilizing the coal water slurry gasification has the advantages that the ratio of hydrogen to carbon entering the fuel cell is moderate, so that the ratio of the hydrogen to the carbon needs not to be adjusted by a CO water gas shift reaction unit or by tail gas recycling; since a coal water slurry gasification system is simple, the integrated gasification fuel cell power generation system is simple in process; since a water-gas conversion process is omitted, energy loss caused by the water-gas conversion process is avoided, and net power generating efficiency of the integrated gasification fuel cell power generation system is improved.

Description

technical field [0001] The invention belongs to the technical field of clean coal power generation, and in particular relates to an integrated coal gasification fuel cell power generation system and method using coal-water slurry gasification. Background technique [0002] Coal is the most important basic energy in our country. Under the current technical level, it is difficult for supercritical coal-fired power generation units and integrated coal gasification combined cycle unit IGCC to achieve lower carbon emission targets. Carbon capture using existing technologies or technologies that are feasible in the near future will not only greatly increase equipment investment, but also significantly reduce power generation efficiency. [0003] The integrated coal gasification fuel cell power generation system IGFC is a power generation system that combines coal gasification power generation technology with high-temperature fuel cells. Its energy conversion efficiency is not lim...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an integrated coal gasification fuel cell power generation system and method using coal-water slurry gasification, which solves the problem of high CO content in the high-temperature fuel cell fuel gas in the existing IGFC system and the need for additional water vapor conversion unit, resulting in a complex system, and the energy loss caused by the water-vapor transformation process is relatively large

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