Patent ID: 6086653
Filing Date: 2000-07-11
Classification: C21B,F27D,Y02P

Abstract:
A smelting reduction apparatus comprising: a melter-gasifier for gasifying a coal and for melting a reduced iron ore; a pre-reducing furnace for indirectly reducing an iron ore by utilizing a reducing off-gas produced at said melter-gasifier; a cyclone for receiving the off-gas from said melter-gasifier through an ascending duct to collect fine iron ore from the off-gas, and to supply the reducing off-gas to said pre-reducing furnace; a melter-burner installed on said melter-gasifier for directing the fine iron ore from said recycling device into said melter-gasifier; a venturi scrubber for receiving a part of the reducing off-gas of said cyclone to collect dust and to cool the gas; and a compressor for compressing the gas cooled by said venturi scrubber to supply the gas through a compressed gas circulating duct into said ascending duct;the apparatus further comprising:a reduced iron discharge device installed between said pre-reducing furnace and said melter-gasifier;said reduced iron discharge device comprising:a first reduced iron discharge duct connected to said pre-reducing furnace for transferring the reduced iron;a reduced iron discharge vessel connected to said first reduced iron discharge duct for receiving the reduced iron from said first reduced iron discharge duct; anda plurality of second reduced iron discharge ducts connected between said reduced iron discharge vessel and said melter-gasifier to supply the reduced iron from said reduced iron discharge vessel to said melter-gasifier; andsaid first and second reduced iron discharge tubes comprising first and second reduced iron discharge screws to discharge the reduced iron.