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Title: Impact of multi-hole-wall air coupling with air-staged technology on H2S evolution during pulverized coal combustion
Authors: Ma, Honghe
Zhou, Lu
Ma, Suxia
Yang, Shiliang
Zhao, Ya
Zhang, Wei
Chew, Jia Wei
Keywords: Engineering::Chemical engineering
Issue Date: 2018
Source: Ma, H., Zhou, L., Ma, S., Yang, S., Zhao, Y., Zhang, W., & Chew, J. W. (2018). Impact of multi-hole-wall air coupling with air-staged technology on H2S evolution during pulverized coal combustion. Fuel Processing Technology, 179, 277-284. doi:10.1016/j.fuproc.2018.07.016
Journal: Fuel Processing Technology
Abstract: The multi-hole-wall air coupling with air-staged technology (MH&AS) was developed for pulverized coal combustion to affect a simultaneous realization of multiple benefits, including prevention of high-temperature corrosion, highly efficient burning of pulverized coal, and low NOx emissions. In this work, the impact of MH&AS on H2S evolution under different conditions was investigated by applying a laboratory-scale MH&AS furnace to test its feasibility for preventing high-temperature corrosion. Some important inclusions were obtained: (i) the lack of multi-hole-wall air for Daheng (DH) coal combustion resulted in H2S concentration exceeding the critical value (namely, 100 ppm) causing high-temperature corrosion, but H2S near the wall could be completely eliminated with a multi-hole-wall air ratio (αm) of 0.1; (ii) the higher the pyrite content of the coal sample was or the smaller the particle size, the larger the H2S concentration near the wall; (iii) the four reactions leading to H2S formation were validated by Gibbs free energy and chemical equilibrium constant calculations. This study affirms the efficiency of MH&AS in mitigating the high-temperature associated with air-staged combustion.
ISSN: 0378-3820
DOI: 10.1016/j.fuproc.2018.07.016
Rights: © 2018 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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