The character of ash deposits and the thermal performance of furnaces

T. F. Wall, S. P. Bhattacharya, L. L. Baxter, G. Richards, J. N. Harb

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Abstract

The character of fireside ash deposits depend on the processes by which deposits are formed and subsequent reactions within the deposit and with furnace gases. The properties influencing furnace heat transfer, absorptivity for radiative transfer and thermal conductivity for conductive transfer are shown from many measurements to depend on this character. Illustrative trends in these properties as deposits mature and grow are presented together with their effect on furnace exit temperature and efficiency. The reflective character of initial deposits from particular coals is then considered with predictions and measurements of the spectral character of such deposits, during the first three hours of growth, using on-line FTIR spectroscopy.

Original languageEnglish
Pages (from-to)143-153
Number of pages11
JournalFuel Processing Technology
Volume44
Issue number1-3
DOIs
Publication statusPublished - 1 Jan 1995
Externally publishedYes

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