Partially-gasified air-preheated and coal-fired combined cycle power generation system and power generation method

摘要

The present invention relates to a partially-gasified air-preheated coal-fired combined cycle power generation system and power generation method, the system is constituted mainly by a coal gas block, which includes a pressured fluidized bed gasifier, gas cooler/steam superheater and ceramic filter, and their auxiliaries, coal is partially gasified in the gasifier while using air and steam as gasifying medium; a boiler block which includes low-multiplex circulation fluidized bed boiler and waste-heat boiler, and their auxiliaries; a gas turbine block which comprises compressor, prepositive combustion chamber, gas turbine, electrical generator and their auxiliaries; a steam turbine block, it comprises steam turbine, electrical generator and their auxiliaries. The optimal combination of the above parts constitute a coal-fired power generation system which can make electrical power with high efficiency, low pollution and low cost.