MATHEMATICAL-MODELING OF A SPOUTED BED COAL GASIFIER

A mathematical model has been developed for the continuous spouted bed coal gasifier which had been developed previously by the authors. The model based on a gasification rate equation and balance equations, assumes the spout and annulus to be two well mixed tanks. The devolatilization data and steam-char reaction rate of Taiheiyo coal were measured using a small scale fixed bed equipment. With these data and the model equations, performance characteristics such as carbon conversion, steam conversion, gas yield and gas composition of a spouted bed gasifier were calculated for selected operating conditions. The results were compared with the previous experiments for Taiheiyo coal by the authors. The dependence of reactor performances on oxygen feed rate and steam feed rate are illustrated well by this model.