MODELING OF AN ENTRAINED FLOW COAL GASIFIER .2. EFFECT OF OPERATING-CONDITIONS ON REACTOR PERFORMANCE

The entrained flow gasification model developed in Part 1 was used for parametric studies to provide a better understanding of the reactor p erformance in terms of coal conversion, product gas composition, calor ific value and temperature profiles throughout the reactor under vario us operating conditions (feed flow rate, particle size and system pres sure). The results suggest that the critical parameters in gasificatio n are the steam-to-coal and oxygen-to-coal feed ratios and the gasifie r pressure. The maximum reactor temperature could be controlled by the concentration of steam in the feed, but its location was strongly dep endent on pressure. In terms of throughput and calorific value of prod uct gas, the performance of the gasifier would be improved with lower steam and oxygen feed rates and higher system pressure; in terms of co nversion, it would be improved with higher system pressure. No experim ents were performed to verify the simulation, but the results are cons istent with those of previous investigations.