Keywords

oxy-coal combustion, ash, aerosol, deposition, recycled flue gas

Abstract

Fouling and slagging processes are important in oxy-coal combustion processes because they greatly influence heat transfer and boiler performance. Ash partitioning processes are precursors to deposition processes and so in order to predict the latter one must have a good understanding of the former. This work involves a 100 kW rated down-fired oxy-fuel combustor outfitted with sophisticated ash aerosol and ash deposit sampling equipment. The work differs from that previously published, in that here we focus on the effects of changes in the composition and amounts of actual recycled flue gas (RFG) streams used in oxy-coal combustion, not using once through CO2, as before. Conditions examined here included oxy-coal combustion with three different RFG cleanup options and two different RFG amounts, and results consist of size segregated compositions of the ash aerosol and spatially resolved compositions within the deposits. In general, results suggested that oxy-combustion conditions did not cause major changes in ash partitioning, fouling and slagging. There are, however, changes in both the compositions of the ultrafine particles and in that of the inner layer of the deposits, and these were due to higher flame temperatures, when these occurred. These results are discussed and interpreted in detail.

Original Publication Citation

Zhan, Z., Fry, A., Yu, D., Xu, M., & Wendt, J. O. L. (2016). Ash formation and deposition during oxy-coal combustion in a 100kW laboratory combustor with various flue gas recycle options. Fuel Processing Technology, 141, 249–257. https://doi.org/10.1016/j.fuproc.2015.10.004

Document Type

Peer-Reviewed Article

Publication Date

2015-10-06

Publisher

Fuel Processing Technology

Language

English

College

Ira A. Fulton College of Engineering

Department

Chemical Engineering

University Standing at Time of Publication

Full Professor

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