Abstract
Deep understanding of the various phenomena in a coal gasifier can be very useful in order to optimize performance and operate the gasifier. A numerical simulation technology which can achieve reasonable design of gasifier is effective. The object of this study is to develop an evaluation tool for a design and performance of the gasifier with numerical simulation technique. In this paper, we suggest numerical simulation models on the coal gasifier and examine the current model on 2t/d bench scale coal gasifier of CRIEPI. Results in a relationship between the gasifier performance and operating condition (air ratio) agree with the experimental results of 2t/d gasifier. Calculation on Nakoso 200t/d pilot scale gasifier is also carried out to assess the effect of burner conditions. It was found that increasing of the secondary air velocity of the burner is more effective than increasing of the virtual diameter ratio on both ash captured efficiency in combustor and carbon conversion efficiency at combustor exit.
