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Simulating combined SO 2 and CO 2 capture from combustion flue gas
Author(s) -
Cousins Ashleigh,
Pearson Pauline,
Puxty Graeme,
Jiang Kaiqi,
Garg Bharti,
Zhai Rongrong,
Ott Pedro,
Verheyen Vince,
Feron Paul H. M.
Publication year - 2019
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1938
Subject(s) - flue gas , flue gas desulfurization , amine gas treating , crystallization , aqueous solution , chemistry , coal , process engineering , waste management , acid gas , combustion , process (computing) , coal combustion products , absorption (acoustics) , data scrubbing , chemical engineering , materials science , inorganic chemistry , organic chemistry , engineering , computer science , composite material , operating system
The requirement to pre‐treat flue gas prior to the CO 2 capture step is an economic challenge when using aqueous amine absorbents for capturing CO 2 from coal‐fired power station flue gases. A potentially lower cost alternative is to combine the capture of both CO 2 and SO 2 from the flue gas into a single process, removing the requirement for the desulfurization pre‐treatment step. The CSIRO's CS‐Cap process uses a single aqueous amine absorbent to capture both of these acid gases from flue gas streams. This paper covers the initial simulation of this process applied to both brown and black coal flue gases. Removal of absorbed SO 2 is achieved via reactive crystallization. This is simulated here using a ‘black box’ process, resulting in a K 2 SO 4 product. Different operating conditions have been evaluated that increase the sulfate concentration of the absorbent in the SO 2 capture section of the process, which is expected to increase the efficiency of the reactive crystallization step. This paper provides information on the absorption of SO 2 into the amine solution, and heat and mass balances for the wider process. This information will be required for further detailed simulation of the reactive crystallization step, and economic evaluation of the CS‐Cap process. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.