Paul Wurth S.a.

Christian Lunkes

Paul Goedert

Guy Junk

Bernard Cauwenberghs

Jean Schmit

Pol Lemmer

An injection system for solid particles comprises a conveying hopper () located at an upstream location (), a fluidizing device () for fluidizing the solid particles at the outlet of the conveying hopper () and forming a solid-gas flow, a pneumatic conveying line () for conveying the solid-gas flow from the fluidizing device () to a downstream location () and a static distribution device () with a plurality of injection lines (), connected thereto. An upstream flow control system controls the mass flow rate in the pneumatic conveying line () at the upstream location () by controlling the opening of an upstream flow control valve () responsive to the solid material mass flow measured in the pneumatic conveying line () at the upstream location (). A downstream flow control system controls the mass flow rate in the pneumatic conveying line () at the downstream location () by controlling the opening of a downstream flow control valve () responsive to the instantaneous mass flow rate sensed by a main downstream mass flow rate sensor ().

Injection system for solid particles

The present invention proposes a method for feeding pulverised coal into a blast furnace, wherein the method comprises the following steps: providing a tuyere stock () for blowing hot blast air from a bustle pipe () into a furnace hearth of a blast furnace through a tuyere () in an opening in the furnace wall (); providing a pulverised coal injection lance () for feeding pulverised coal into the tuyere (), the pulverised coal injection lance () comprising an inner pipe () for conveying pulverised coal and an outer pipe (), coaxially arranged around the inner pipe (), for conveying combustive gas, the inner pipe () forming a separation wall for separating the pulverised coal from the combustive gas, the pulverised coal injection lance () having a lance tip () arranged in the tuyere (); allowing the pulverised coal and the combustive gas to form a mixture of pulverised coal and combustive gas at the lance tip (); burning the mixture of pulverised coal and combustive gas in the tuyere (); monitoring whether or not a flame at the lance tip () is burning; and upon determination that the flame at the lance tip () is not burning, reigniting the flame by temporarily reducing the flow of combustive gas through the pulverised coal injection lance ().

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Soleuvre, Luxembourg

Christian Lunkes