METHOD OF GASIFICATION OF COAL

PURPOSE:To obtain high gasification ratio even at low load, by spraying two finely powdered coal having different particles sizes, respectively, from the upper burner and the lower burner of a circular gasification furnace, collecting them in the gasification furnace, gasifying them completely. CONSTITUTION:The finely powdered coal 1 is divided into the finely powdered coal 1' having larger particle diameters and the finely powdered coal 1'' having smaller particle diameters by the classifier 2, the finely powdered coal 1' and the oxygen 3' are jetted from the upper burner 4 to the circular gasification furnace 6, and the finely powdered coal 1'' and the oxygen 3'' from the lower burner 5. The finely powdered coal 1' is partially gasified to form active char having reactivity since a zone around the upper burner of the gasification furnace 6 is in a low-oxygen atmosphere, the active char is pushed away to the vicinity of the furnace wall by a centrifugal force, and collected in the gasification furnace 6. On the other hand, the finely powdered coal 1'' is rapidly gasified since a zone around the lower burner of the gasification furnace 6 is in a high-oxygen atmosphere, a high-temperature gas rich in CO2 and H2O is evolved, and the gas is efficiently brought into contact with the active char produced from the finely powdered coal 1', and completely gasified.