关键词: 碳捕集率, 乙醇胺, 热力系统, 等效焓降法, 热经济性指标

Abstract: Aimed at the effects of carbon capture system on the coal-fired unit economy and with a 600 MW supercritical unit as study object，this paper analyzed the coupled manner between the carbon capture after combustion system and the coal-fired unit，established the evaluation heat economy index of the coupled system calculated and analyzed the effects of changing carbon capture rate and the density of monoetharolamine (MEA) on the heat economy，based on the System Sensitivity Analysis method. The research results showed that at a certain MEA density，when the carbon capture rate increased，the whole plant heat efficiency decreased，and the power production standard coal consumption and the whole plant heat consumption increased；and at a certain carbon capture rate，when the MEA density increased，the power production standard coal consumption and the whole plant heat consumption increased accordingly. At MEA density of 30% and a carbon capture rate of 85%，unit heat economy performance reached optimal value，and the whole plant heat efficiency was 36.34%，6.76% lower than the original 43.10%.

Key words: carbon capture ratet, monoetharolamine (MEA), thermal power system, equivalent enthalpy drop method, thermal economic indicators