A METHOD FOR PRE-REDUCTION AND HEAT RECOVERY OF HOT SINTER

摘要

PURPOSE: A method for pre-reduction and sensible heat recovery of hot sinter is provided to enhance the efficiency of reduction gas by recirculating reduction off-gas in a reduction furnace and to control heat recovery amount through the control of circulation amount by independently supplying circulation nitrogen to a cooled reactor. CONSTITUTION: A method for pre-reduction and sensible heat recovery of hot sinter comprises the following steps: transferring crushed hot sinter(22) to a reduction furnace; pre-reducing a part of the hot sinter by supplying reduction gas to the reduction furnace(30); putting the partly reduced sinter into a cooled reactor(50); cooling the partly reduced sinter by supplying nitrogen to the cooled reactor; putting the cooled reduced sinter into a blast furnace; and recovering sensible heat of reduction gas having an increased temperature due to the hot sinter in a pre-reduction process of the hot sinter.