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Modeling of gasification of charcoal spheres with $CO_2$, CO, and $N_2$

Dasappa, S and Paul, PJ and Mukunda, MS and Shrinivasa, V (1993) Modeling of gasification of charcoal spheres with $CO_2$, CO, and $N_2$. In: Action Resonance Development Biomass Gasification, 1993, pp. 85-99.

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Abstract

A comprehensive model for gasification of charcoal spheres in $CO_2-N$ mixture was studied. The charcoal gasification process involving diffusion and reactions in the pores was modelled and the results are compared with experiments of Standish and Tanjung on wood charcoal spheres with diameter d = 5-20 m. For $CO_2$ gasification the conversion time $t = d_{1.03}$ for large particles (>5 mm) departs substantially from the $tb = d_2$ law valid for diffusion-limited conditions. The computational studies indicate the kinetic limit for the particle ranges <3 mm in $CO_2$ ambient. The predictions from the model for charcoal conversion are compared with $CO_2-N_2$ experiments conducted by Standish and Tanjung. Also the dependence on the CO concentration with low $CO_2$ is significant, indicating the need to use a multistep reaction mechanism against the generally accepted single-step reaction.

Item Type: Conference Paper
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA)
Date Deposited: 31 Jul 2008
Last Modified: 27 Aug 2008 13:30
URI: http://eprints.iisc.ernet.in/id/eprint/14608

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