Title: CO2 capture analysis in different combustion methods for CO2 utilisation and storage

Authors: Weijia Huang; Ruina Xu; Fuzhen Zhang; Yining Zou; Peixue Jiang

Addresses: School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China ' Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China ' Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China ' Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China ' Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China

Abstract: The high energy consumption of CO2 capture is the main issue of the application of CO2 capture, utilisation and storage, new CO2 capture methods based on oxy-fuel combustion and chemical looping combustion are receiving considerable attention. However, the energy consumption performance of these methods is rarely compared when they are used as the CO2 source for CO2 utilisation and storage. This work analysed both the new developing and traditional methods of CO2 capture process to obtain their energy consumption performances. The CO2 capture processes of the oxy-fuel combustion and chemical looping combustion were respectively built and simulated under pressure varied from 0.1 MPa to 8.0 MPa. The captured CO2 product of each process was set to the same level of parameters for transportation, and a calculation method was developed to convert all types of energy consumption to equivalent power consumption. The results show that both the new CO2 capture methods have notable potential of low energy consumption, especially under higher combustion pressures. If the air separation process is considered, the oxy-fuel combustion CO2 capture requires further technical development to defeat the post-combustion CO2 capture, although it has the advantage of high CO2 concentration. The impacts of pressures of inlet gas and process sequence are analysed to be the key reasons for energy performance. [Received: May 23, 2019; Accepted: January 10, 2021]

Keywords: pressurised oxy-fuel combustion; chemical looping combustion; process simulation; energy consumption; CO2 capture.

DOI: 10.1504/IJOGCT.2022.121048

International Journal of Oil, Gas and Coal Technology, 2022 Vol.29 No.3, pp.285 - 305

Accepted: 10 Jan 2021
Published online: 23 Feb 2022 *

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