An experimental investigation of oxy-coal combustion in a 15 kWth pressurized fluidized bed combustor

Pang, Lei; Shao, Yingjuan; Zhong, Wenqi; Liu, Hao; Jiang, Peixue

Abstract

Pressurized oxy-coal combustion is considered as a promising carbon capture technology due to its potential of high efficiency and low cost in CO2 capture. However, experimental investigations of oxy-coal combustion under pressurized conditions are far less common than those under atmospheric pressure conditions and hence further research is needed to elucidate the effects of pressure on oxy-coal combustion in terms of combustion performance and emissions etc. In this study, a series of oxy-coal combustion experiments were carried out under the pressures from 0.1 MPa to 0.4 MPa on a 15 kWth fluidized bed combustion system. The effects of the combustion pressure and oxygen concentration in the oxidant on the temperature profile, unburnt carbon, combustion efficiency, fly ash composition and NOx emission were investigated. The experimental results have shown that the CO2 concentration in the oxy-combustion flue gas under different combustion pressures have all exceeded 90%, which is beneficial to the carbon capture process. An increase in pressure is helpful to reduce the unburnt carbon in the fly ash and improve the combustion efficiency under all the tested oxycombustion atmospheres. The NOx emission decreases with combustion pressure within the investigated range of 0.1 MPa to 0.4 MPa, while the reduction is more pronounced at lower pressures. Besides, the effect of combustion pressure on the chemical composition of the fly ash is found to be insignificant.

Citation

Pang, L., Shao, Y., Zhong, W., Liu, H., & Jiang, P. (2018). An experimental investigation of oxy-coal combustion in a 15 kWth pressurized fluidized bed combustor. Energy and Fuels, 33(3), 1694-1703. https://doi.org/10.1021/acs.energyfuels.8b02654

• Journal Article Type: Article
• Acceptance Date: Dec 14, 2018
• Online Publication Date: Dec 14, 2018
• Publication Date: Dec 14, 2018
• Deposit Date: Dec 20, 2018
• Publicly Available Date: Dec 20, 2018
• Journal: Energy & Fuels
• Print ISSN: 0887-0624
• Electronic ISSN: 1520-5029
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 33
• Issue: 3
• Pages: 1694-1703
• DOI: https://doi.org/10.1021/acs.energyfuels.8b02654
• Keywords: Carbon capture; Oxy-coal combustion; Pressurized fluidized-bed
• Public URL: https://nottingham-repository.worktribe.com/output/1430230
• Publisher URL: https://pubs.acs.org/doi/10.1021/acs.energyfuels.8b02654
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy and Fuels, copyright © 2018 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.energyfuels.8b02654