Multiple burner-type furnace with enhanced turndown ratio...

F - Mech Eng,Light,Heat,Weapons – 24 – H

Patent

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F24H 3/08 (2006.01)

Patent

CA 2558136

A gas fired furnace capable of operating with a 16:1 turndown ratio or greater. The furnace includes a plurality of burners (10) grouped into at least (14a) first and second (14b) groups, each group connected to a source of combustible gas through a control valve (30a, 30b, 30c). The control valve (30c) controlling at least one group of burners is of a modulating type having an output proportional to a control signal applied to the valve. The burners fire into associated heat exchange tubes (20a), each tube having an inlet (24) and an outlet. The tube outlets are connected to a collector chamber (44) that includes a baffle plate (60) that divides the collector into two sections, one of the sections communicating with the outlets of the tubes associated with the first group of burners, the other section communicating with the outlets of the heat exchanger tubes associated with the other group of burners.

L'invention concerne un four alimenté au gaz capable de fonctionner à un débit moyen du brûleur de 16:1 ou plus. Ce four comprend plusieurs brûleurs (10) groupés dans au moins un premier (14a) et un second (14b) groupe, chaque groupe étant relié à une source de gaz combustible à travers une soupape de commande (30a, 30b, 30c). La soupape de commande (30c) qui commande au moins un groupe de brûleurs est de type modulante et possède une sortie proportionnelle au signal de commande appliqué à la soupape. Les brûleurs brûlent dans des tubes d'échangeur thermique associés (20a), chaque tube possédant une entrée (24) et une sortie. Les sorties de tube sont connectées à une chambre de collecte (44) qui comprend un déflecteur (60) qui divise le collecteur en deux sections, l'une communiquant avec les sorties des tubes associés au premier groupe de brûleurs, et l'autre communiquant avec les sorties des tubes d'échangeur thermique associés à l'autre groupe de brûleurs.

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