Exploratory activity has been conducted to develop a "Coal Partial Combustor" for the conversion from gas/oil firing to coal firing under the sponsorship of MITI since 1984. One application includes the use of CPC as a simple coal gasifier. Development of a coal gasifier was carried out by using a 36 T-coal/D pilot plant in 1989. The gasifier is characterized by five types (1) atmospheric, (2) oxygen-enriched air-blown, (3) cyclone slagging type, (4) with char recycle, and (5) compact. This paper presents the test results on the characteristics of coal gasification and the means of data analysis. Test results indicated that the overall performance of the gasifier such as the heating value of the product gas and cold gas efficiency can be predicted by the stoichiometric ratio of the product gas. One-through carbon conversion efficiencies were determined under several operation conditions. The use of oxygen-enriched air and char recycle help to increase the heating value of the product gas and the cold gas efficiency.
