Ash transformations in the real-scale pulverized coal combustion of South African and Colombian coals
- VTT (Finland)
- ABB Corporate Research, Baden (Switzerland)
- ABB Flaekt Industri AB, Vaexjoe (Sweden)
In this work, the formation of ash particles in the combustion of South African Klein Kropie coal and a Colombian coal was studied by measuring the ash particle characteristics upstream of the electrostatic precipitator (ESP) at a 510 MW{sub e} pulverized coal fired power plant. The authors measured the ash particle mass size distributions in the size range 0.01--50 {micro}m using low-pressure impactors and precutter cyclones. Also, samples were collected for computer controlled scanning electron microscopy (CCSEM) with a cyclone with an aerodynamic cut-diameter of about 1 {micro}m. The cyclone-collected samples were analyzed with standard CCSEM procedure by depositing the particles on a filter, and by embedding the particles in epoxy hence acquiring the cross-section analysis of the sample. All major mineral classes in both coals were found to undergo extensive coalescence during combustion. Iron, calcium and magnesium rich particles resulting from the decomposition of pyrite, calcite and dolomite were found to coalesce with quartz and aluminosilicate particles. The size distributions of the fly ash determined with CCSEM and low-pressure impactor-cyclone sampler were found to be similar.
- Research Organization:
- Engineering Foundation, New York, NY (United States)
- OSTI ID:
- 305681
- Report Number(s):
- CONF-9507274-PROC.; ISBN 0-306-45376-2; TRN: IM9906%%361
- Resource Relation:
- Conference: Engineering Foundation conference on applications of advanced technology to ash-related problems in boilers, Waterville Valley, NH (United States), 16-21 Jul 1995; Other Information: PBD: 1996; Related Information: Is Part Of Applications of advanced technology to ash-related problems in boilers. Proceedings; Baxter, L. [ed.] [Sandia National Labs., Livermore, CA (United States)]; DeSollar, R. [ed.] [Central Illinois Public Service, Springfield, IL (United States)]; PB: 675 p.
- Country of Publication:
- United States
- Language:
- English
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