Anal. of the combustion and gasification of coal dust in the designed cyclone furnace was carried out on the basis of numerical calcn. The temp. control in the furnace chamber was adjusted by means of an endothermic Boudouard reaction (gasification of a carbonizate). The design of the lower part of the furnace and the arrangement of the gas supply nozzles allowed to control the residence time of the fuel grains in the furnace. Coal gasification products showed CO concn. of about 78.6%.