Operational process and its improved control system of a...

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

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F23N 5/18 (2006.01) F23G 5/50 (2006.01) F23G 7/06 (2006.01) F23N 1/02 (2006.01) F23N 1/04 (2006.01)

Patent

CA 2271917

Control system and method for monitoring and controlling the stoichiometry of a secondary air burner in a thermal oxidizer. The burner control system secures a certain stoichiometry independent of possible simultaneous changes of the gas mixture flow rate and/or of the combustible impurity concentration in the process gas. The firing rate of the burner is adjusted by a controller. Additionally, the flow of the burner fuel and of the process gas mixture are measured and transformed into separate signals. Both signals are sent to an evaluation apparatus that compares the signals and generates a third signal based upon that comparison. This third signal is in communication with a device that changes the gas mixture flow resistance, and thus the desired amount of gas mixture will be diverted for the combustion of the fuel.

Cette invention se rapporte à un système de commande, ainsi qu'au procédé correspondant, qui permet de surveiller et de réguler la stoechiométrie d'un brûleur à air secondaire d'un dispositif de thermooxydation. Le système de commande du brûleur maintient une stoechiométrie donnée, indépendante des changements simultanés possibles du débit du mélange gazeux et/ou de la concentration des impuretés combustibles dans le gaz utilisé. Le taux de combustion du brûleur est ajusté par un organe de commande. En outre, le flux du carburant du brûleur et celui du mélange gazeux utilisé sont mesurés et transformés en des signaux distincts. Les deux signaux sont transmis à un appareil d'évaluation qui compare ces signaux et génère un troisième signal en fonction de cette comparaison. Ce troisième signal est transmis à un dispositif qui modifie la résistance au flux du mélange gazeux, et de ce fait la quantité désirée de mélange gazeux se trouve déviée en vue de la combustion du carburant.

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