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Modeling of Infra‐Particle C‐CO 2 Reaction: An Application of the Random Pore Model
Author(s) -
Liu G.S.,
Tate A.G.,
Rezaei H.R.,
Beath A.C.,
Wall T.F.
Publication year - 1999
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500070507
Subject(s) - adsorption , carbon dioxide , reaction rate , langmuir , chemistry , particle (ecology) , desorption , carbon fibers , partial pressure , thermodynamics , carbon monoxide , activated carbon , reactions on surfaces , langmuir adsorption model , materials science , physics , catalysis , organic chemistry , oceanography , composite number , oxygen , composite material , geology
The Random Pore Model developed by Bhatia et al. was applied to intra‐particle gasification reactivity of carbon with carbon dioxide in present contribution. Instead of the conventional n‐th order equation, the Langmuir‐Hinshelwood equation, which treats reaction to be an adsorption and desorption two‐step reaction, was employed as an expression for the carbon and carbon dioxide surface reaction in the model. A balance between gas diffusion and consumption for each position in the particle was established as derived in the Thiele analysis. Numerical calculations were carried out to solve the integrated equations. The results show that a big difference of reaction rate is exhibited between using the n‐th order rate expression and the Langmuir‐Hinshelwood (L‐H) equation. The results also show the distributions of CO 2 partial pressure, surface area, reaction rate and carbon conversion within the particle during the gasification. The overall conversions at different structure parameters, which are correspondent to initial porosity of 0.05, 0.2 and 0.4, are also presented in the paper. A small deviation of the effectiveness factors obtained between using the Langmuir‐Hinshelwood and the n‐th order equation is indicated with the carbon burn‐off between 0–85%.