Institut De Recherches De La Siderurgie Francaise (irsid)

Institut De Recherches De La Sidergie Francaise Irsid

Michel Schneider

Yann De Lassat De Pressigny

Hugues Zanetta

The tuyere comprises a substantially cylindrical or slightly convergent frusto-conical downstream part, and a divergent frusto-conical upstream part; the plasma torch is placed co-axially to the tuyere at the inlet to the upstream part thereof; the solid materials injection nozzle issues at an angle into the upstream part of the tuyere and the angle of taper of the upstream part of the tuyere substantially corresponds to the angle of natural expansion of the plasma jet, so that said materials are carried with the plasma jet and that part of them are provided onto the inner wall of the tuyere.

Device for injecting divided solid materials in a smelting blast furnace

The invention relates to a device for injecting pulverulent material, such as coal, into a blast furnace. The device includes a hot blast tuyere issuing into the blast furnace, a nozzle fixed against said tuyere and co-axial thereto for bringing the hot blast, a branch connection produced obliquely on the nozzle and directed towards the tuyere, and an injection pipe traversing the branch connection to issue into the tuyere. According to the invention, the injection pipe is substantially an arc of circle, the convexity of which is directed towards the axis of the nozzle and of the tuyere. The radius of curvature is at least equal to one hundred times its inner diameter.

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Semecourt, France

Michel Schneider