Method and burner for introducing fuel to a kiln

F - Mech Eng,Light,Heat,Weapons – 23 – C

Patent

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Details

F23C 7/00 (2006.01) F23D 17/00 (2006.01)

Patent

CA 2272270

A method as well as a burner are provided for introducing solid, liquid or gaseous fuel into the burning zone of a kiln, such as a rotary kiln for manufacturing cement clinker or similar products, where fuel is conducted through substantially concentric ducts (1, 6) and where primary air is conducted through two likewise concentric and annular ducts (8, 9) arranged around the fuel ducts, where the air in one of these air ducts (9) is made up of axially flowing air, whereas the air in the second air duct (8) comprises air which is caused to rotate about the centre axis of the burner, and where the portions of primary air can be -independently controlled. The peculiar feature of the burner is that the primary airstreams are mixed at a relatively low velocity in a collecting duct (15) into a primary airstream which is subsequently accelerated up to a desired, relatively high velocity prior to being injected into the kiln via an annular nozzle (14). There is thus obtained effective mixing of fuel and air in an operationally reliable manner with a minimum loss of pressure, and the flame shape can be adapted to the optimum desired.

L'invention concerne un procédé et un brûleur pour l'introduction de combustible solide, liquide ou gazeux dans une zone de combustion d'un four, tel qu'un four rotatif pour la fabrication de clinker ou produits analogues. Le combustible est amené à travers des conduites (1, 6) sensiblement concentriques et l'air principal est amené à travers deux conduits (8, 9) concentriques et annulaires disposés autour des conduites de combustible. L'air dans un de ces conduits (9) d'air est composé d'un flux à écoulement axial, tandis que l'air du second conduit (8) d'air est composé d'un flux à écoulement rotatif autour de l'axe central du brûleur, les deux flux d'air principal pouvant être régulés indépendamment. Le brûleur est caractérisé en ce que les courants d'air principal sont mélangés à une vitesse relativement basse dans un conduit collecteur (15) avec un courant d'air principal qui est accéléré ultérieurement jusqu'à ce qu'il atteigne une vitesse voulue, relativement élevée, avant d'être injecté dans le four via une buse (14) annulaire. On obtient ainsi un mélange efficace de combustible et d'air opérationnellement fiable avec un minimum de perte de pression. La forme de la flamme peut être adaptée afin d'être optimale.

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