Reburn process

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

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F23L 9/02 (2006.01) F23B 80/00 (2006.01) F23G 5/00 (2006.01)

Patent

CA 2298785

A process and apparatus for combustion in which a combustible material is introduced into a combustion chamber and oxidant is supplied to the combustion chamber combusting the combustible material, and forming a primary combustion zone. A mixture of flue gases and flyash having an organic content is injected into the combustion chamber downstream of the primary combustion zone to create an oxygen deficient reburn zone, thereby lowering the temperature of combustion, reducing the NOx content of the flue gases, and reducing the potential for NOx formation in a tertiary oxidizing combustion zone disposed downstream of the oxygen deficient reburn zone.

Procédé et appareil de combustion. Selon ledit procédé, une matière combustible est introduite dans une chambre de combustion et un oxydant est introduit dans la chambre de combustion brûlant la matière combustible, ce qui forme une zone de combustion primaire. Un mélange de gaz de combustion et de cendres volantes ayant une teneur en matière organique est injecté dans la chambre de combustion en aval de la zone de combustion primaire pour créer une zone de combustion secondaire pauvre en oxygène, ce qui abaisse la température de combustion, réduit la teneur en NO¿x? des gaz de combustion, et réduit le potentiel de formation de NO¿x? dans une zone de combustion oxydante tertiaire se trouvant en aval de la zone de combustion secondaire pauvre en oxygène.

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