System and Method for Direct-Fired Supercritical CO2 Power Generation of Sub-MWe

摘要

The present invention relates to a small-sized direct-fired supercritical carbon dioxide power generation system and method suitable for distributed power generation, wherein the small-sized direct-fired supercritical carbon dioxide power generation system for distributed power generation comprises a combustor for burning hydrocarbon fuel and oxygen; A turbine driven by the combustion gas discharged from the combustor; A heat exchanger that regenerates and heats the combustion gas recirculated to the combustor by exchanging heat with the combustion gas discharged to drive the turbine; And a mixer that mixes a portion of the recirculated combustion gas heated and regenerated through the heat exchanger and supplies it to the combustor. In addition, the small direct-fired supercritical carbon dioxide power generation method for distributed power generation according to the present invention comprises the steps of burning hydrocarbon fuel and oxygen in a combustor; A process of driving the turbine by the combustion gas discharged from the combustor; A process of regenerating and heating the combustion gas recirculated from the heat exchanger to the combustor by exchanging heat with the combustion gas discharged by driving the turbine; And a process in which a part of the recycled combustion gas regenerated and heated through the heat exchanger in the mixer is mixed with oxygen and supplied to the combustor.