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http://dx.doi.org/10.7842/kigas.2019.23.1.27

Exergy Analysis of Cryogenic Air Separation Unit for Oxy-fuel Combustion  

Choi, Hyeung-chul (Daesung Cryogenic Research Institute, Daesung Industrial Gases Co., Ltd.)
Moon, Hung-man (Daesung Cryogenic Research Institute, Daesung Industrial Gases Co., Ltd.)
Cho, Jung-ho (Dept. of Chemical Engineering, University of Kongju)
Publication Information
Journal of the Korean Institute of Gas / v.23, no.1, 2019 , pp. 27-35 More about this Journal
Abstract
In order to solve the global warming and reduce greenhouse gas emissions, $CO_2$ capture technology was developed by applying oxy-fuel combustion. But there has been such a problem that its economic efficiency is low due to the high price of oxygen gases. ASU is known to be most suitable method to produce large quantity of oxygen, to reduce the oxygen production cost, the efficiency of ASU need to be improved. To improve the efficiency of ASU, exergy analysis can be used. The exergy analysis provides the information of used energy in the process, the location and size of exergy destruction. In this study, the exergy analysis was used for process developing and optimization of large scale ASU. The process simulation of ASU was conducted, the results were used to calculate the exergy. As a result, to reduce the exergy loss in the cold box of ASU, a lower operating pressure process was suggested. It was confirmed the importance of heat leak and heat loss reduction of cold box. Also, the unit process of ASU which requires thermal integration was confirmed.
Keywords
exergy analysis; oxy-fuel combustion; oxygen; cryogenic; air separation; ASU;
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