Fluidized bed breakage prevention system for fluidized bed reduction reactor and method

Abstract

A fluidized bed reduction reactor ( ) for supplying a reduced iron to a melter-gasifier ( ) of a smelting reduction system includes an exhaust gas supply unit ( ) for supplying an exhaust gas to a reduction gas supply tube ( ) interconnecting the melter-gasifier ( ) and fluidized bed reduction furnaces ( ) when the pressure of the reduction gas in each fluidized bed reduction furnace radically decreases with the occurrence of pressure peak in the melter-gasifier ( ). The fluidized bed reduction reactors further include iron ore flow blockage prevention units for directly bypassing some of the reduction gas from each iron ore discharge tube ( ) disposed between the neighboring furnaces to the scrubber ( ) when the inner pressure of the melter-gasifier ( ) radically increases with the occurrence of pressure peak, and a backup gas supply unit supplying a backup nitrogen gas to the bottom of each fluidized bed reduction furnace when a nozzle of a distribution plate ( ) is clogged.