Slagging caused by deposit of molten fly ash on hot walls is a major concern in the operation of full-scale utility boilers. We carried out a comprehensive study, experimental and modeling, on slagging with various coals. Coal samples were taken prior and during combustion and analyzed by SEM (Scanning Electron Microscope). From the SEM analysis the coals could be divided into two types: (1) Coal with tiny particulates of the mineral matter deposited loosely on the surface of coal particles or between carbon particles (external ash) and (2) coal with the mineral matter encapsulated within the coal particles (internal ash). We found different slagging and char combustion characteristics directly related to the two coal types. It was observed that internal ash coals show higher slagging propensity and higher carbon content in the fly ash. Previous models to predict slagging did not distinguish between the two coal types and their impact on slagging and combustion behavior. We developed a model for high temperature ash deposition on the furnace walls for these two coal types. In this model, char combustion and carbon content in the fly ash are also considered. Comparison of experimental observation with calculation results from the ash deposition model show good agreement. Another conclusion from the model is that slagging propensity for internal ash coals increases with coal particle size. However, this conclusion has to be verified experimentally.
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ASME 2007 Power Conference
July 17–19, 2007
San Antonio, Texas, USA
Conference Sponsors:
- Power Division
ISBN:
0-7918-4273-8
PROCEEDINGS PAPER
Slagging of Ash From Sub-Bituminous and Bituminous Coals in a Test Combustion Facility
Yuli Berman,
Yuli Berman
Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Boris Davidson,
Boris Davidson
Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Efim Korytnyi,
Efim Korytnyi
Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Miron Perelman,
Miron Perelman
Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Roman Saveliev,
Roman Saveliev
Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Nadine D. Spitz,
Nadine D. Spitz
Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Ezra Bar-Ziv
Ezra Bar-Ziv
Ben-Gurion University of the Negev, Beer-Sheva, Israel
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Yuli Berman
Ben-Gurion University of the Negev, Beer-Sheva, Israel
Boris Davidson
Ben-Gurion University of the Negev, Beer-Sheva, Israel
Efim Korytnyi
Ben-Gurion University of the Negev, Beer-Sheva, Israel
Miron Perelman
Ben-Gurion University of the Negev, Beer-Sheva, Israel
Roman Saveliev
Ben-Gurion University of the Negev, Beer-Sheva, Israel
Nadine D. Spitz
Ben-Gurion University of the Negev, Beer-Sheva, Israel
Ezra Bar-Ziv
Ben-Gurion University of the Negev, Beer-Sheva, Israel
Paper No:
POWER2007-22067, pp. 447-454; 8 pages
Published Online:
April 21, 2009
Citation
Berman, Y, Davidson, B, Korytnyi, E, Perelman, M, Saveliev, R, Spitz, ND, & Bar-Ziv, E. "Slagging of Ash From Sub-Bituminous and Bituminous Coals in a Test Combustion Facility." Proceedings of the ASME 2007 Power Conference. ASME 2007 Power Conference. San Antonio, Texas, USA. July 17–19, 2007. pp. 447-454. ASME. https://doi.org/10.1115/POWER2007-22067
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