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Oxidation of Metals

, Volume 77, Issue 5–6, pp 289–304 | Cite as

Measurement of Corrosive Gaseous Species in Staged Coal Combustion

  • Steven C. Kung
Original Paper

Abstract

A comprehensive fireside corrosion study has been performed to gain further understanding of the corrosion mechanisms operating in coal-fired utility boilers. Nine commercial coals from eight coal mines, representing a wide range of coal chemistry, were selected for this study. Combustion of these coals was carried out in a 160 KWth pilot-scale combustion facility that closely simulated the actual conditions of staged combustion in utility boilers. During the pilot-scale testing, gas and deposit samples were collected and analyzed online via in-furnace probing through sampling ports at elevations corresponding to the lower furnace and superheater locations. The in-furnace gas measurements identified the coexistence of reducing and oxidizing species in the gas phase, revealing the non-equilibrium nature of the combustion products. The amounts of sulfur and chlorine released to the gas phase as sulfur and chlorine-bearing species in both the reducing and oxidizing zones were linearly proportional to the amount of total sulfur and chlorine in coal, independent of their original forms. Furthermore, thermodynamics and kinetics of the sulfur and chlorine gas-phase and gas–solid reactions were considered. Based on comparison of the calculated and observed results, a new ash deposition mechanism is proposed.

Keywords

Fireside corrosion Staged combustion Oxidating Reducing Coal Sulfur Chlorine Deposit Deposition 

Notes

Acknowledgments

This work was supported by the U.S. Department of Energy under Award Number DE-FC26-07NT43097. The author would like to acknowledge the DOE project manager, Vito Cedro, of the National Energy Technology Laboratory in Pittsburgh, PA, for his invaluable collaboration.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Babcock & Wilcox Power Generation GroupMaterials & Manufacturing TechnologyBarbertonUSA

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