B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/50 (2006.01) B01D 53/83 (2006.01)
Patent
CA 2375001
Described is a method and apparatus for desulphurisation of exhaust gases from a cement making plant by bonding gaseous sulphur dioxide to calcium-containing cement raw meal which is extracted from the calcination stage (4) of the plant and subsequently brought into contact with the exhaust gases as a sulphur- absorbing reactant. The specific method slaking and grinding the extracted raw meal prior to it being brought into contact with the exhaust gases. By this method and apparatus an improvement of the thermal economy, is obtained by reducing the quantity of raw meal required for the desulphurisation process. This is ascribable to the fact that by subjecting the raw meal to slaking and grinding, the fineness of the raw meal will be improved, thereby enhancing the efficiency of the desulphurisation process.
L'invention concerne un procédé et un appareil de désulfuration de gaz d'échappement provenant d'une installation de fabrication de ciment, qui consiste à lier du gaz sulfureux à un cru de ciment contenant du calcium, extrait de l'étape de calcination (4) de l'installation et à le mettre en contact avec les gaz d'échappement sous forme de réactif absorbant le soufre. Le procédé de l'invention consiste notamment à désagréger et à broyer le cru extrait avant qu'il soit mis en contact avec les gaz d'échappement. Grâce aux procédé et appareil de l'invention, on augmente l'économie d'énergie thermique en réduisant la quantité de cru requise pour le procédé de désulfuration. En effet, en soumettant le cru à la désagrégation et au broyage, on augmente la finesse du cru et on augmente ainsi l'efficacité du procédé de désulfuration.
Hundebol Soren
Thomsen Kent
Borden Ladner Gervais Llp
F. L. Smidth & Co. A/s
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