| 摘要 |
PURPOSE:To improve thermal efficiency in a hot stove installation for a blast furnace consisting of three units of hot stoves by overlapping the start of blasting to the another hot stove in the end period of the blasting stage for each hot stove at a prescribed ratio. CONSTITUTION:A hot stove installation for a blast furnace consisting of three units of hot stoves A, B, C is selectively operated according to a cycle consisting of a combustion stage, pressurizing stage and blasting stage, by which hot wind is fed successively to a blast furnace 4. A part of the blasting stage for one other hot stove B is started in overlap at an overlap rate of <=40% of the entire period in each blasting stage at the end period of the blasting stage for the hot stove A. The blasting overlapped from the furnace B to the furnace C and from the furnace C to the furnace A is thereafter repeated in the same way. Since there is no need for maintaining the hot wind at the temp. considerably higher than the assigned temp., thermal efficiency is improved. |
