Capturing and sequestering carbon dioxide (CO 2 ) from coal-fired power plant has been proposed as one of the key solutions for stabilizing greenhouse gas concentration in the atmosphere. There are two main procedures for CO 2 capturing in existing coal-fired combustion plants: removal of nitrogen from flue gases and removal of nitrogen from the air before combustion in order for a gas stream to be ready for geo-sequestration. In oxy-fuel combustion, fuel is burned with pure oxygen (O 2 ) instead of air. This technology recycles flue gases back into the furnace to control temperature and make up the volume of the missing nitrogen (N 2 ) to ensure that there is sufficient gas to maintain the temperature and heat flux profiles in the boiler. In this study, feasibility of oxy-coal fired for retrofitting existing normal air-operated coal-fired power plant has been studied. Also, the optimum fraction of recirculated flue gas for maximizing generated power is represented. Our results show that the oxy-fuel combustion is suitable for retrofitting the existing coal-fired power plants as well as for new plants without the replacement of main components.
Capturing and sequestering CO 2 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 CO 2 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 CO 2 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 CO 2 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 CO 2 capture systems, respectively.
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