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Mathematical modeling of combustion and gasification of a wet coal slab—I: Model development and verification

✍ Scribed by Joseph G.M. Massaquoi; James B. Riggs

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
837 KB
Volume
38
Category
Article
ISSN
0009-2509

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✦ Synopsis

A one-dimensional model has been developed for the simultaneous drying and combustion of a semi-infinite wet coal slab. The model takes into account the vaporization of coal moisture and the existence of a moving evaporation front, pyrolysis and char/gas reactions occurring in the dry coal zone, Darcy flow of vapor and gases through the coal, variation in porosity and permeability of the coal, temperature dependence of the physical properties of the coal, transpiration cooling effect of the water vapor and pyrolysis gases, multi-component diffusion in the ash and gas film, and oxidation reactions in the ash. The model is capable of predicting the dame position, the combustion rate. the flame temperature, and the temperature on the coal surface.

The performance of the model is compared with experimental data. Agreement between the computed results and the observed data is good.

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