Various low-NOx combustion technologies have been widely applied as primary measures to limit NOx emission in coal-fired boilers. However, this leads to the formation of high concentrations of H2S in the fuel-rich zone and thus causes high-temperature corrosion of the water-wall. In order to suppress the formation of H2S near the water-wall, it is necessary to have adequate knowledge of the reaction mechanisms of sulfur species during coal combustion. Therefore, this work systematically reviews the current state-of-the-art concerning reaction mechanisms for sulfur species, including global mechanisms, detailed mechanisms, and reduced mechanisms. Additionally, two operation techniques, namely, near-wall air and multi-hole-wall air, are introduced to avoid high-temperature corrosion caused by H2S. Finally, some new research directions are recommended to further reveal the reaction mechanisms of sulfur species and to test the feasibility of multi-hole-wall air on preventing high-temperature corrosion.
Review on Reaction Mechanisms of Sulfur Species During Coal Combustion
Contributed by the Advanced Energy Systems Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received December 12, 2018; final manuscript received April 10, 2019; published online May 2, 2019. Assoc. Editor: Dr. Ashwani K. Gupta.
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Ma, H., Zhou, L., Lv, S., Chew, J. W., and Wang, Z. (May 2, 2019). "Review on Reaction Mechanisms of Sulfur Species During Coal Combustion." ASME. J. Energy Resour. Technol. October 2019; 141(10): 100801. https://doi.org/10.1115/1.4043554
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