Coal gasification supercritical carbon dioxide electricity generating system and method

Abstract

The invention provides a coal gasification supercritical carbon dioxide electricity generating system and method. The coal gasification supercritical carbon dioxide electricity generating system comprises an air separating device, a combustor, a turbine and a gas cycling system, wherein an oxygen outlet of the air separating device is connected with an oxygen inlet of the combustor; a coal gas pipeline is also connected to the combustor; a carbon dioxide outlet of the combustor is connected with a gas inlet of the turbine; and an exhaust outlet of the turbine enters the combustor again throughthe gas cycling system. According to the coal gasification supercritical carbon dioxide electricity generating system adopting the structure, disclosed by the invention, the conversion efficiency ofheat into power can be greatly improved, the size of the equipment is reduced, and the coal gasification supercritical carbon dioxide electricity generating system is economical.

Description

technical field The invention belongs to the technical field of supercritical carbon dioxide power generation, and in particular relates to a coal gasification supercritical carbon dioxide power generation system and method. Background technique Energy and the environment are two major problems facing the development of human society. Continuously improving the efficiency of generator sets is the eternal theme and goal of power industry research. Currently, the more commonly used power cycles include the Rankine cycle with water as the working fluid and the Brayton cycle with air as the working fluid. Conventional coal-fired power plants mainly use the Rankine cycle with water as the working fluid. At present, the initial steam parameters of the largest one-million-kilowatt coal-fired power plant have reached 31MPa and 620°C. The gas turbine mainly uses the Brayton cycle with air as the working medium. At present, the inlet gas temperature of the advanced aero-engine turbin...

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Problems solved by technology

The purpose of the present invention is to provide a coal gasification supercritical carbon dioxide power generation system and method, which solves the existing defect that the efficiency of the generator set cannot be improved due to the limitation of the initial parameters of the working fluid by the material

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