Study on heat integration of supercritical coal-fired power plant with post-combustion CO 2 capture process through process simulation

Citation data:

Fuel, ISSN: 0016-2361, Vol: 158, Page: 625-633

Publication Year:
2015
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DOI:
10.1016/j.fuel.2015.06.033
Author(s):
Xiaoyan Liu, Jian Chen, Xiaobo Luo, Meihong Wang, Hui Meng
Publisher(s):
Elsevier BV
Tags:
Energy, Chemical Engineering, Chemistry
article description
Coal-fired power plant (CFPP) is one of the main sources of anthropogenic CO 2 emissions. Capturing CO 2 from CFPP by post-combustion process plays an important role to mitigate CO 2 emissions. However, a significant thermal efficiency drop was observed when integrating CFPP with post-combustion carbon capture (PCC) process due to the steam extraction for capture solvent regeneration. Thus research efforts are required to decrease this energy penalty. In this study, a steady state model for 600 MW e supercritical CFPP was developed as a reference case with a low heating value (LHV) based efficiency of 41.6%. A steady state model for MEA-based PCC process was also developed and scaled up to match the capacity of the CFPP. CO 2 compression process was simulated to give an accurate prediction of its electricity consumption and cooling requirement. Different integration cases were set up according to different positions of steam extraction from the CFPP. The results show that the efficiency penalty is 12.29% and 14.9% when steam was extracted at 3.64 bar and at 9.1 bar respectively. Obvious improvements were achieved by utilizing waste heat from CO 2 capture and compression process, taking part of low pressure cylinders out of service, and adding an auxiliary turbine to decompress the extracted steam. The efficiency penalty of the best case decreases to 9.75%. This study indicates that comprehensive heat integrations can significantly improve the overall energy efficiency when the CFPP is integrated with PCC and compression process.

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