C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 7/44 (2006.01) C04B 7/36 (2006.01) F27B 7/42 (2006.01)
Patent
CA 2182903
The invention relates to a method for controlling the temperature in a kiln in which cement clinker is manufactured, with a burning zone temperature within the range 1100-1500°C. This invention makes it possible to control the temperature in the kiln, and hence to control the manufacture of the clinker which is produced in the cement kiln, while simultaneously reducing the NOx-emission of the kiln to a minimum. By the method according to the invention, a calculation is made of the sulphur evaporation in the kiln, thereby obtaining a measure of the instantaneous temperature in the burning zone. The evaporation factor is calculated on the basis of measurements of the sulphur content in the cyclone material which passes to the kiln or a measurement of the sulphur content in the exit gases out of the kiln.
L'invention se rapporte à un procédé de régulation de la température d'un four dans lequel on fabrique du clinker de ciment, de façon à maintenir la température de la zone de cuisson dans la plage de 1100-1500 ~C. Il est ainsi possible de réguler la température du four, et, de ce fait, la fabrication du clinker produit dans le four à ciment, tandis que l'émission de NO¿x? du four est réduite au minimum. Grâce au procédé de la présente invention, on calcule le niveau d'évaporation de soufre dans le four, et on obtient ainsi une mesure de la température instantanée dans la zone de cuisson. Le facteur d'évaporation est calculé en fonction de mesures de la teneur en soufre du matériau provenant d'un cyclone, qui parvient au four, ou en fonction d'une mesure de la teneur en soufre des gaz sortant du four.
Borden Ladner Gervais Llp
F.l. Smidth & Co. A/s
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