Low nox combustion system for fuel-fired heating appliances

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

Patent

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Details

F23D 14/84 (2006.01) F23M 9/06 (2006.01) F24H 3/08 (2006.01) F24H 9/18 (2006.01)

Patent

CA 2185861

A fuel-fired, forced air, draft induced heating furnace is provided with NOx reduction apparatus associated with a plurality of combustor tubes forming a portion of its heat exchanger structure. In-shot type fuel burners are spaced apart from and face the open inlet ends of horizontal combustion sections of the combustor tubes. The NOx reduction apparatus includes a plurality of metal mesh tubes having diameters substantially less than the internal diameters of the combustion tubes. Each metal mesh tube is coaxially anchored to and telescopingly over the outlet end of one of the burners and extends therefrom coaxially into the associated combustion tube. During burner operation the burner flames injected into the combustor tubes are forced through the mesh tubes which operate to laterally reduce the cross-sections of the flames, increase their axial velocity through the combustor tubes, and substantially diminish the intimate contact of secondary combustion air with the maximum temperature zones of the flames within the combustor tubes.

Cette invention concerne un appareil de chauffage à combustible à tirage forcé et pulseur d,air comportant un dispositif de réduction des Nox associé à une série de tubes de combustion formant une partie de sa structure d'échange de chaleur. Des brûleurs de combustible horizontaux sont espacés des tubes de combustion et orientés vers l'extrémité ouverte des tronçons horizontaux de ceux-ci. Le dispositif de réduction des Nox comprend une série de tubes en treillis métallique dont le diamètre est sensiblement inférieur au diamètre intérieur des tubes de combustion. Chaque tube en treillis métallique est fixé de manière centrée autour de la sortie de l'un des brûleurs et se prolonge à l'intérieur du tube de combustion correspondant. En cours de fonctionnement des brûleurs, les flammes qui pénètrent dans les tubes de combustion passent à travers ces tubes en treillis dont la fonction est de réduire leur section transversale, d'augmenter leur vitesse axiale de progression à travers lesdits tubes de combustion et de réduire sensiblement le contact étroit de l'air de combustion secondaire avec les zones de température maximum des flammes à l'intérieur de ceux-ci.

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