Method and apparatus for cascaded biomass oxidation with...

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

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F23B 80/04 (2006.01) F23B 10/00 (2011.01) F23B 90/00 (2011.01) F23L 1/00 (2006.01) F23L 9/00 (2006.01) F23N 3/00 (2006.01)

Patent

CA 2746826

The invention relates to a method for cascaded biomass oxidation in a dish burner with ejection firing. The fuel (18), together with oxygen-containing primary air, is fed to a gasifier dish (8) having high thermal conductivity, in which the fuel is gasified by pyrolysis in a first combustion step, the resulting gas is conducted through guiding devices (6, 9) over the dish edge (11) of the gasifier dish, or over recesses on the upper dish edge, to the outside wall of the dish (8), and is enriched with oxygen-containing secondary air in the intermediate chamber (10) and converted into a cyclone flow around the outer shell dish during a second combustion step, through the convection of which strong thermal feedback is created, together with the high reflection of the thermal radiation on the guiding devices.

Procédé d'oxydation de biomasse en cascade dans un brûleur cupuliforme avec chargement par chute. Le combustible (18) est introduit avec de l'air primaire contenant de l'oxygène dans une cuvette de gazéification (8) à forte conductibilité thermique, le combustible étant gazéifié par pyrolyse lors d'une première étape de combustion. Le gaz qui en résulte est guidé par des dispositifs de guidage (6, 9) de manière à passer au-dessus du bord (11) de la cuvette de gazéification ou par des évidements ménagés dans le bord supérieur de la cuvette, sur la paroi externe de la cuvette (8), puis enrichi dans l'espace intermédiaire (10) avec de l'air secondaire contenant de l'oxygène, et amené à former un écoulement cyclonique autour de la paroi externe de la cuvette lors d'une seconde étape de combustion pendant laquelle la forte convection associée à la forte réflexion du rayonnement thermique produit une forte rétroaction thermique au niveau des dispositifs de guidage.

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