Coal direct chemical looping process: 250 kW pilot-scale testing for power generation and carbon capture

Yitao Zhang, Dawei Wang, Yaswanth Pottimurthy, Fanhe Kong, Tien-Lin Hsieh, Bartev Sakadjian, Cheng Chung, Cody Park, Dikai Xu, Jinhua Bao, Luis Velazquez-Vargas, Mengqing Guo, Peter Sandvik, Sourabh Nadgouda, Thomas J. Flynn, Andrew Tong and Liang-Shih Fan

Applied Energy, 2021, vol. 282, issue PA, No S0306261920314963

Abstract: Chemical looping combustion (CLC) is an energy conversion technology that can produce concentrated CO2 stream without the need for a gas separation step, and thus, has the potential to drastically reduce the energy consumption and cost associated with CO2 capture in power generation. The coal-direct chemical looping (CDCL) process is a CLC technology that uses a moving bed reducer configuration that can directly consume coal as a feedstock without requiring an upstream gasification step. An integrated 250 kWth CDCL pilot unit using iron-based oxygen carriers was constructed and demonstrated for over 1000 h of testing. The principles for the CDCL pilot unit design and operation are summarized in this article. During the 288-hour continuous operation testing, the CDCL pilot unit achieved >96% coal conversion with a CO2 purity of >97%. Low carbon carryover into the combustor, i.e. <2%, was also confirmed during the test, which shows the capability of the moving bed reactor to retain and convert coal using the oxygen available on the iron-based oxygen carrier. The results from the pilot unit testing confirms the CDCL concept as a promising coal combustion technology for heat and power generation with CO2 capture.

Keywords: Chemical looping; Power production; Carbon capture; Coal; Pilot-scale unit (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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DOI: 10.1016/j.apenergy.2020.116065

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