| 摘要 |
PURPOSE:To utilize effectively the sensible heat and combustible component of the gas formed by reaction in a melt reducing furnace by using said gas in preliminary reduction of powdery and granular ore then in heating oxidative gas in regenerater type heat exchangers thereafter using the same as combustion gas. CONSTITUTION:The gas formed by reaction from a vertical type melt reducing furnace 11 is passed as reducing gas for a fluidized bed through a preliminary reducing furnace 12 where said gas is used in effecting the preliminary reduction of powdery and granular ore. The combustible gas of high temp. discharged from the furnace 12 is partly burned in combustion chambers 15, 15' according to need to increase the temp. thereof, then the gas is passed through regenerater type heat exchangers 16, 16', from which the gas as combustible gas of low temp. is partly passed through a temp. controller 18 to decrease the temp. thereof according to need. Such gas is passed through a dust collector 19 and is accumulated in a gas holder 20. The oxidative gas such as air to be blown to the furnace is passed by a blower 21 through the exchangers 16, 16' stored therein with heat and is thus made into the high temp. gas, prior to blowing of said air. |
