Advertisement

The UK Collaborative Research Programme on Slagging Pulverised Coal-Fired Boilers: Summary of Findings

  • W. H. Gibb

Abstract

A major UK collaborative research programme to address all aspects of slagging in bituminous coal-fired boilers has recently been completed. The 3 1/2-year programme comprised an integrated package of full-scale plant trials; rig and laboratory-scale tests; coal, flyash, and deposit characterisation by Computer Controlled scanning Electron Microscopy (CCSEM); and the development of computer models. The major findings are presented in this paper.

It is concluded that the key to the behaviour of ash deposits lies in understanding their consolidation by a viscous flow sintering mechanism. For UK coals, iron and calcium (derived from pyrite and calcite respectively) are the main fluxing elements that affect ash viscosity and it is, therefore, the degree of assimilation of these elements into the aluminosilicate glass that ultimately determines the slagging characteristics of the coal.

CCSEM can be used to quantify the mineral matter distribution in coals and a novel slagging index based on CCSEM analysis that takes account of the effectiveness of the fluxing elements present, in particular the pyrite-derived iron, is proposed. A methodology for studying the ash deposition characteristics of coals using a laboratory-scale Entrained Flow Reactor (EFR) has also been established. CCSEM analysis of deposits formed in the EFR shows the potential for coalescence and provides the basis for an alternative slagging index.

Keywords

Aluminosilicate Glass Boiler Operation Slag Process Boiler Design Slag Deposit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Gibb, W.H., Jones, A.R. and Wigley, F. (1993). “The UK Collaborative Research Programme on Slagging in Pulverised Coal-Fired Furnaces: Results of Full-Scale Plant Trials.” In J.Williamson and F.Wigley (Eds), The Impact of Ash Deposition on Coal Fired Plants, Washington: Taylor and Francis, 1994.Google Scholar
  2. Cunningham, A.T.S., Gibb, W.H., Jones, A.R., Wigley, F. and Williamson, J. (1991). “The Effect of Mineral Doping of a Coal on Ash Deposition Behaviour”. Proceedings of the Engineering Foundation Conference on Inorganic Transformations and Ash Deposition during Combustion. March, 10–15, 1991, Palm Coast, Florida.Google Scholar
  3. Hutchings, I.,West, S.S. and Willamson, J.(1995). An Assessment of Coal Ash Slagging Propensity Using an Entrained Flow Reactor This conference.Google Scholar
  4. Lee, F.F., Riley, G.S. and Lockwood, F.C.(1995). The UK Collaborative Research on Slagging and Fouling in PF-Fired Furnaces - Mathematical Modelling of Ash Deposition Behaviour This conference.Google Scholar
  5. Wigley, F. and Williamson, J. (1995). Modelling Flyash Generation for UK Power Station Coals. This conference.Google Scholar
  6. Williamson, J. and Wigley, F. (1994). The Impact of Ash Deposition on Coal-Fired Plants“. Proceedings of the Engineering Foundation Conference, Solihull, England, June 20–25, 1993. Washington: Taylor and Francis, 1994.Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • W. H. Gibb
    • 1
  1. 1.Power Technology Ratcliffe-on-SoarPowerGenNottinghamEngland

Personalised recommendations