Applicability of gas-solid reaction models on the gasification of inner Mongolian lignite with CO₂ and steam

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Document Type

Conference Proceeding

Source Title

22nd Regional Symposium on Chemical Engineering

Publication Date

2015

Abstract

The kinetics of the gasification of Inner Mongolian lignite with CO2 and steam was investigated in the presence of 5-10 wt% K2CO3 from 600C-900C. The applicability of the theoretical models (volumetric model, random pore model and shrinking core-model) and the empirical models (modified volumetric model and extended modified volumetric model) was determined by the evaluation of the root-mean-square deviation and standard deviation. Among the different models, the extended modified volumetric model (EMVM) was observed to be most effective to simulate both the uncatalyzed and catalyzed gasification reactions. This study was also able to provide the kinetic parameters from the EMVM with accuracy and goodness of fit. Although theoretical models were proven to best simulate uncatalyzed reactions, these models also showed goodness of fit as the catalyst loses its activity as shown in the gasification reactions in which the ash from the previous runs was re-used. The re-use of resulting ash resulted to an initial decrease of 40% in the CO2-gasification rate and an average of 10% decrease in the succeeding runs while an initial 18% decrease in the steam gasification rate and 1.5% decrease in the succeeding runs. Demineralization of the lignite samples resulted to 90% reduction in the gasification rate which shows the catalytic activity of the inherent inorganic species present in the ash.

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Disciplines

Chemical Engineering

Keywords

Regional Symposium on Chemical Engineering (22nd : 2015 : Bangkok; Thailand

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