Exergy-based analysis of conventional coal-fired power plant retrofitted with oxy-fuel and post-combustion CO 2 capture systems

Abstract

Capturing and sequestering CO₂ from coal-fired power plant is being proposed as one of the key solutions for stabilizing greenhouse gas concentration in the atmosphere. Recently, absorbing system and oxy-fuel combustion technology have been proposed as attractive options for capturing CO₂ in power generation systems utilizing hydrocarbon fuels. This study is focused on energy and exergy analysis to compare the oxy-fuel combustion and absorbing system from different points of view to make a better insight into the cases from different aspects. The results show that the post-combustion and oxy-fuel CO₂ capture systems result in 10.5% and 9.1% decrease in exergy efficiency of the retrofitted plants, respectively, compared with the conventional coal-fired power plant (base case). Additionally, boiler is the major exergy destruction source in all investigated plants. Also, air separation unit and CO₂ capture and storage system have the largest amount of exergy destruction among the additional components of retrofitted plant with oxy-fuel combustion and post-combustion CO₂ capture systems, respectively.

Keywords

Coal-fired power plant oxy-fuel retrofit

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