METHOD OF COAL GASIFICATION AND DIRECT IRONMAKING AND SYSTEM THEREFOR

摘要

A system for coal gasification and direct ironmaking which is effective in attaining both heat recovery in a coal-based direct ironmaking process and a reduction in equipment investment in a coal gasification process is disclosed. The system as shown in the flowchart is characterized by being equipped with: a waste-heat boiler (16) which recovers the heat of a gas discharged from a coal gasification furnace; a heater (7) disposed in lines (1a and 1b) for a gas discharged from a heating/reducing furnace (1) used in the coal-based direct ironmaking process, the heater (7) superheating the steam generated by and discharged from the waste-heat boiler (16); and a superheated-steam line (23) which supplies, as an oxidizing agent, the superheated steam obtained with the heater (7) to the coal gasification furnace (10). Particularly disclosed is a method of coal gasification and direct ironmaking, comprising the steps of: recovering heat of an exhaust gas exhausted in a coal gasification process by a waste heat boiler in the process; guiding steam produced and exhausted by the waste heat boiler to a heater provided in an exhaust gas path in a coal-based direct ironmaking process so as to superheat the steam therein; and supplying the resultant superheated steam as an oxidant to a coal gasification furnace in the coal gasification process.