A laboratory assessment of the slagging propensity of blended coals
- Imperial College of Science, London (United Kingdom)
- National Power plc, Swindon (United Kingdom)
This paper presents the results of an experimental study to assess the stagging propensity of blends of UK coals with world traded coals when burned under low NOx conditions. Coals ground to pulverised coal grade were blended in a laboratory mixer. Ash deposits were formed by passing the coals through an entrained flow reactor designed to simulate the time-temperature conditions which pulverised coal particles are subjected to in a large utility boiler. The deposits were collected on a ceramic probe at approximately 1250{degrees}C. The stagging propensity of the coal ash was assessed from a CCSEM chemical and microstructural characterization of mounted and polished cross-sections of each deposit. The CCSEM data was used to obtain an estimate of the fraction of the deposit which would have been fluid enough for viscous flow sintering to have occurred, producing fused and bonded portions of the slags. The results indicate that the stagging propensity of a coal blend may be a nonlinear function of the composition, showing both positive and negative deviations from a simple additive relationship. The findings are discussed in terms of the mineral matter transformations which occur in forming ash particles and boiler wall deposits.
- OSTI ID:
- 420563
- Report Number(s):
- CONF-960807-; ISSN 0569-3772; TRN: 97:000002-0068
- Journal Information:
- Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Vol. 41, Issue 3; Conference: 212. national meeting of the American Chemical Society (ACS), Orlando, FL (United States), 25-30 Aug 1996; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
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