Paul Wurth S.a.

Bernard Cauwenberghs

Paul Goedert

Georges Stamatakis

Guy Junk

Christian Lunkes

Jean Schmit

Markus Mayer

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

A method for producing pulverized coal including the steps of providing a drying gas heated to a predefined temperature in a hot gas generator; feeding the heated drying gas into a pulverizer; introducing raw coal into the pulverizer, the pulverizer grinding the raw coal into pulverized coal; collecting a mixture of drying gas and pulverized coal from the pulverizer and feeding the mixture to a filter, the filter separating the dried pulverized coal from the drying gas; collecting the dried pulverized coal for further use and feeding the drying gas from the filter to an exhaust line; and collecting the drying gas exiting the filter and feeding part of the collected drying gas to a recirculation line for feeding recirculation drying gas to the hot gas generator. According to an important aspect of the present invention, the step of providing the drying gas includes feeding a variable flow rate of hot stove waste gas to the hot gas generator through a hot stove waste gas line so as to maximize the amount of hot stove waste gas used as drying gas. A pressure of the drying gas at a pulverizer gas inlet is controlled by regulating a flow rate of the hot stove waste gas through the hot stove waste gas line.

Method of producing pulverized coal

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Holzem, Luxembourg

Bernard Cauwenberghs