Development of numerical simulation technique for coal gasification on entrained flow coal gasifier (modeling of coal gasification reaction and prediction of gasifier performance)

Abstract

A modeling of a coal gasification reaction and prediction of gasification performance of an entrained flow coal gasifier are presented in this paper. The purposes of this study are to develop an evaluation technique for a design and performance optimization of the coal gasifier using a numerical simulation technique and to confirm the validity of the model. The coal gasification model suggested in this paper is composed by a pyrolysis model, char gasification model and gas phase reaction model. A numerical simulation with the coal gasification model was carried out on the CRIEPI 2 tons/day bench scale coal gasifier. Influence of air ratio on gasification performance, such as a per pass carbon conversion efficiency, amount of the product char, a heating value of the product gas and cold gas efficiency, is presented on the 2t/d coal gasifier. Gas temperature distribution and product gas composition are also presented. Comparison between the computation and the experimental data shows that most features of the gasification performance have been captured accurately by the numerical procedure and the validity of the current model was confirmed.