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Testing of a mathematical model for the combustion of lignites in an AFBC

✍ Scribed by Olcay Oymak; Nevin Selçuk; Işik Önal

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
629 KB
Volume
72
Category
Article
ISSN
0016-2361

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✦ Synopsis

A mathematical model, previously developed and tested for the modelling of continuous fluidized-bed combustors burning good-quality coal, has been modified to incorporate combustion of lignites having much higher VCM/FC ratios and ash contents. Modifications of the model for volatiles combustion and the incorporation of overflow ash into mass and energy balances are described. Concentration and temperature profiles and combustion efficiencies predicted for 0, 19 and 48% excess air levels are compared with experimental data from a pilot-scale fluidized-bed combustor. It is shown that oxygen consumption in the freeboard is mainly due to the oxidation of volatile matter released by lignite particles splashed into the freeboard. The predictions show reasonable agreement with the experimental data.

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