The purpose of this program is to develop and apply over three years an accurate and general computer model that will expedite the development and aid in the optimization and scale-up of fluidized beds and entrained flow reactors for coal gasification. Initial applications will be to high-BTU, fluidized bed gasification processes, Later the work will be extended to consider low-BTU fluidized bed gasification, entrained flow reactors and fluidized bed combustion.