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Experimental investigation on the coal combustion in a pressurized fluidized bed

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

Authors

Lei Pang

Yingjuan Shao

Wenqi Zhong

HAO LIU liu.hao@nottingham.ac.uk
Professor of Energy Engineering



Abstract

Pressurized oxy-coal combustion is considered as one of the most promising carbon capture technologies in terms of high carbon capture efficiency and low cost. However, practical operational experience with pressurized coal combustion in a fluidized bed, especially with continuous coal feeding, is still very limited. In this study, a pressurized fluidized bed combustion system was developed and a series of coal combustion experiments were carried out with continuous coal feeding under the pressures from 0.1 to 0.4 MPa. The effects of the combustion pressure and stoichiometric air coefficient on the fluidized bed combustion performances of a Chinese lignite in terms of the temperature distribution profile, apparent solid holdup, combustion efficiency, conversion ratio of carbon in coal to CO2 and ash composition were investigated. The experimental results show that an increase in pressure is beneficial to the improvement of combustion efficiency, and the positive effect of increasing stoichiometric air coefficient on the conversion ratio of carbon in coal to CO2 is more obvious with a lower combustion pressure. The bottom ash and fly ash have similar chemical compositions under different pressures. Based on the experimental data, a correlation as the functions of pressure and stoichiometric air coefficient is proposed to predict the conversion ratio of carbon in coal to CO2.

Citation

Pang, L., Shao, Y., Zhong, W., & Liu, H. (2018). Experimental investigation on the coal combustion in a pressurized fluidized bed. Energy, 165(B), 1119-1128. doi:10.1016/j.energy.2018.09.198

Journal Article Type Article
Acceptance Date Sep 29, 2018
Online Publication Date Oct 6, 2018
Publication Date Dec 15, 2018
Deposit Date Oct 10, 2018
Publicly Available Date Oct 7, 2019
Journal Energy
Print ISSN 0360-5442
Electronic ISSN 1873-6785
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 165
Issue B
Pages 1119-1128
DOI https://doi.org/10.1016/j.energy.2018.09.198
Keywords Pressurized coal combustion; Fluidized-bed stoichiometric air coefficient
Public URL https://nottingham-repository.worktribe.com/output/1156219
Publisher URL https://www.sciencedirect.com/science/article/pii/S0360544218319765?via%3Dihub#!

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Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/





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