| 摘要 |
PURPOSE:To prevent occurrence of pollutional defect such as noise, scattering of dust, discharge of harmful gas, etc. at the stage of releasing high pressure exhaust gas from the top of a blast furnace by adding a little reconstruction to an existing equalizing device at a top charging hopper of a blast furnace operating at a high pressure. CONSTITUTION:When a raw material is charged to a two-bells one-valve type high top pressure operation blast furnace 1, a primary equalizing valve 18 in a primary equalizing pipe 17 connecting to a small bell hopper 6 is opened, and the gas in said hopper 6 is stored in the primary equalizing pipe 17 up to a stop valve 29 to perform the primary release. Then the valve 18 is closed and a releasing valve 25 is opened to perform the secondary release of the hopper 6; a sealing valve 9 is opened and the raw material is fed to the small bell hopper 6 through a swing chute 2. The stored waste gas between the valves 18 and 29 is then returned back to the hopper 6 to equalize the pressure in the hopper 6 to the inside pressure of a large bell hopper 7; thus, the small bell 4 is lowered and the raw material is charged to the large bell hopper 7. The large bell hopper 7 and the top of the blast furnace 11 are connected with an equalizing pipe 10 and the pressure inside of both are equalized. The large bell 5 is thus lowered and the raw material is fed to the furnace 11. |
