Method of burning waste material to recover thermal energy

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

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F23G 5/16 (2006.01) F23G 5/00 (2006.01) F23G 5/30 (2006.01)

Patent

CA 2184086

Waste is burnt in a furnace chamber (1). The oxygen-containing flue gases resulting in this process are introduced into a fluidized bed in an afterburning chamber (5) and reburnt. Solids discharged with the flue gases from the afterburning chamber (5) are separated from the flue gases in a dust separator (9) and recycled to the afterburning chamber (5), so that a circulating fluidized bed is formed, which produces a very homogeneous temperature distribution in the after- burning chamber (5) and at the same time permits highly efficient cooling of the flue gases. A secondary oxygen feed for the afterburning is dispensed with, which enables a decrease in size both of the afterburning chamber (5) and also of the downstream heat-recovery and gas cleaning devices and improvement in efficiency resulting therefrom.

Les déchets sont incinérés dans un foyer (1). Les fumées ainsi produites, contenant de l'oxygène, sont introduites dans un lit fluidisé d'une chambre de postcombustion (5) où elles subissent une postcombustion. Les matières solides provenant de la chambre de postcombustion (5) sont séparées des fumées dans un séparateur de poussière (9) et réintroduites dans la chambre de postcombustion (5) de façon à produire un lit fluidisé circulant qui assure une répartition très homogène de la température dans la chambre de postcombustion (5) et permet simultanément un refroidissement très efficace des fumées. Il est possible de renoncer à un apport secondaire d'oxygène pour la postcombustion, ce qui entraîne une réduction de l'encombrement aussi bien de la chambre de postcombustion (5) que des unités de récupération de chaleur et de purification des gaz montées en aval, et par conséquent une amélioration du rendement.

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