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Using an experimentally-determined model of the evolution of pore structure for the gasification of chars by CO<inf>2</inf>

Dai, P and Dennis, JS and Scott, SA (2016) Using an experimentally-determined model of the evolution of pore structure for the gasification of chars by CO<inf>2</inf>. Fuel, 171. pp. 29-43. ISSN 0016-2361

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Abstract

© 2015 Elsevier Ltd. All rights reserved. A pseudo-steady state model of reaction and diffusion has been constructed to model the non-isothermal gasification of single char particles by CO 2 . The model uses a Cylindrical Pore Interpolation Model for intraparticle mass transfer, Ergun's Langmuir-Hinshelwood equation for the intrinsic rate of gasification, an experimentally determined function f(X) for the pore evolution as a function of the conversion X, the Stefan-Maxwell equations to describe external mass transfer and the equation of energy for energy balance. Experiments were conducted to measure rates and extent of conversion, at various temperature and for various particle sizes, of lignite char and the less reactive activated carbon. The simulation results have been compared with experimental measurements, with excellent agreement being obtained. The results show that for the gasification of chars, the experimentally determined function f(X) predicts the rate of reaction of particles of various sizes well, all being at the same temperature. However, for the CO 2 gasification of char particles, at least, an f(X) evaluated at one temperature does not predict experimental measurements well at other temperatures, possibly because there are contributions from multiple types of active sites within the particles. However, multiple sites are also not reflected in most published pore models.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:42
Last Modified: 14 Sep 2017 01:25
DOI: