| 摘要 |
PURPOSE:To stabilize supplying of powdery substance and prevent wear of each pipe of apparatus, by specifying an angle formed by aperture surface of an introducing pipe for powdery material with center axis of blowing pipe, moving velocity of powdery material in the introducing pipe and a distance from aperture of the introducing pipe to tuyere top end. CONSTITUTION:Powdery granule ore supplied from a hopper 1 is charged from tuyere into vertical furnace through a supplying pipe 3, the introducing pipe 4 and a blowing pipe 5. I this time, the angle theta3 formed by aperture surface of the pipe 4 with center axis of the pipe 5, the powder moving velocity V0 in the pipe 5 and the distance L from introducing pipe aperture to tuyere to end are determined so that a inequality I is satisfied. In the inequality, DE' is shown in a formula II, Wf: upper limit powder supplying velocity (kg/sec), V0: blowing air flow quantity (Nm<2>/sec), T: blowing air temp. ( deg.K), P: blowing air pressure (kg/m<2>), rho: blowing air density (kg/m<3>), mu: blowing air viscosity (kg/m.sec), Re: blowing air Reynolds number (-), D: tuyere diameter (m), L: aforesaid (m), theta3: aforesaid (degree), V0: aforesaid (m/sec), DE': effective eddy diffusion coefft. (m<2>/sec). |
