Method and plant for manufacturing cement clinker

F - Mech Eng,Light,Heat,Weapons – 27 – B

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Details

F27B 7/20 (2006.01) C04B 7/43 (2006.01)

Patent

CA 2477888

A method and plant for manufacturing cement clinker are disclosed, in which cement raw meal is calcined in a calciner (3, 23). The calciner (3, 23) comprises an upper zone (3a, 23a) and a lower zone (3b, 23b), where fuel, combustion gas and raw meal are introduced into the upper zone of the calciner and directed downward through the calciner. The combustion gas and raw meal are introduced tangentially into the calciner and subject to rotation follow a spiral-shaped flow path, and, under the action of gravity, the raw meal is primarily directed down along the wall of the calciner. The rotation of the combustion gas in at least the lower zone of the calciner is subjected to braking and approximately simultaneously or subsequently at least some of the combustion gas and at least some of the raw meal in the lower zone of the calciner is directed in the direction towards the centre-line of the calciner.

L'invention concerne un procédé et un dispositif de production de clinker de ciment. Selon ce procédé, de la farine crue de ciment est calcinée dans un calcinateur (3, 23). Ce calcinateur (3, 23) comprend une zone supérieure (3a, 23a) et une zone inférieure (3b, 23b), du carburant, du gaz de combustion et de la farine crue étant introduits dans la zone supérieure du calcinateur et dirigés vers le bas à travers le calcinateur. Le gaz de combustion et la farine crue sont introduits de façon tangentielle dans le calcinateur et soumis à une rotation suivant un trajet d'écoulement en forme de spirale, et, sous l'action de la gravité, la farine crue est préalablement dirigée vers le bas le long de la paroi du calcinateur. La rotation du gaz de combustion dans au moins une zone inférieure du calcinateur est soumise au freinage et presque simultanément ou subséquemment au moins une partie du gaz de combustion et au moins une partie de la farine crue contenues dans la zone inférieure du calcinateur sont dirigées en direction de la ligne centrale du calcinateur.

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