Combustion system of a steam generator designed for oxyfuel...

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

Patent

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F23L 7/00 (2006.01)

Patent

CA 2756312

For a steam generator comprising a combustion chamber fired with a fossil fuel and/or with particulate fuel containing carbon and at least one burner level comprising several burners (1) and/or at least one level comprising nozzles in the form of upper air nozzles and/or side wall nozzles, each having connected feed means (9, 10, 11, 12) and/or feed lines (2, 4, 5, 9a-9d, 10a-10d, 11a-11d, 12a-12d) through which/by means of which gas flows conveying combustion and/or oxidation oxygen can be fed to burners (1) and/or the nozzles (13) and/or the combustion chamber, a solution should be created by means of which undesired oxygen contents in the flue gas can be avoided during oxyfuel operation of the steam generator in the partial-load range. This is achieved in that the feed means (9, 10, 11, 12) and/or the feed lines (2, 2a-2d, 4, 5, 9a--9d, 10a-10d, 11a-11d, 12a-12d) are designed in such a way that at least one burner (1) or some of the burners (1) independently of the other burners (1) and/or a nozzle (13) or some of the nozzles (13) independently of the other nozzles (13) can be exposed to a gas flow providing the desired oxygen content or the desired oxygen concentration and/or the desired oxygen mass flow.

L'invention concerne un générateur de vapeur avec une chambre de combustion alimentée par un combustible fossile et/ou par un combustible à base de carbone sous forme particulaire et au moins un plan de brûleurs comprenant plusieurs brûleurs (1) et/ou au moins un plan comprenant des buses prenant la forme de buses d'air supérieures et/ou de buses de parois latérales, raccordés à des moyens d'alimentation (9, 10, 11, 12) et/ou des conduites d'alimentation (2, 4, 5, 9a à 9d, 10a à 10d, 11a à 11d, 12a à 12d) grâce auxquels sont amenés aux brûleurs (1) et/ou aux buses (13) et/ou à la chambre de combustion des flux gazeux transportant de l'oxygène de combustion et/ou d'oxydation. L'objectif est d'éviter les teneurs non souhaitées en oxygène dans les gaz de fumée lorsque le générateur de vapeur fonctionne en oxycombustion en régime de charge partielle. Cet objectif est atteint du fait que les moyens d'alimentation (9, 10, 11, 12) et/ou les conduites d'alimentation (2, 2a à 2d, 4, 5, 9a à 9d, 10a à 10d, 11a à 11d, 12a à 12d) sont configurés de manière qu'au moins un brûleur (1) ou une partie des brûleurs (1), indépendamment des autres brûleurs (1), et/ou une buse (13) ou une partie des buses (13), indépendamment des autres buses (13), reçoive un flux gazeux fournissant la teneur voulue en oxygène ou la concentration voulue en oxygène et/ou le débit massif d'oxygène voulu.

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