| 摘要 |
PURPOSE:To increase using quantity of fine powdered coal at low cost by blasting heated oxygen and the fine powdered coal from tuyeres of a blast furnace and blowing preheated gas from a shaft part. CONSTITUTION:Material is charged into the blast furnace 1 from the furnace top, and the furnace gas is sent to a gas holder 3 through a furnace top gas cleaning mechanism 2 and branched on the way, and high temp. gas is developed by a preheating gas generator 5 through a booster 4. This gas is blown in the furnace from gas blowing holes 6 arranged in the shaft part. Further, a part of the gas is blasted in the furnace from the tuyeres 9 through a booster 4' as temp. adjusting gas in front of tuyeres. On the other hand, the oxygen is sent to the preheating gas generator 5 and the tuyeres 9 from an oxygen source 7, but ordinarily, it is blasted into the furnace from tuyeres 9 together with the fine powdered cool from a fine powdered coal vessel 8 as a part of substitute for coke. It is desirable that the temp. adjusting gas in front of tuyere is blown as little as possible and the consumption of fine powdered coal is increased.
|
