Patent ID: 7524186

Claim:
A low emissions burner comprising: a diffusion burner including a casing for receiving air under pressure and having an axis, a swirler for mixing and imparting rotational motion to the air supplied through said casing and a fuel inlet to said casing for providing a stabilized flame downstream of the swirler; a plurality of discrete premix burners surrounding said air supply casing about said axis; each said premix burner including a burner sleeve, a fuel supply conduit for supplying fuel into the burner sleeve, an air supply conduit for supplying air under pressure into said burner sleeve, and a secondary air inlet for supplying air to said burner sleeve in addition to the pressurized air supplied thereto by said air supply conduit; said fuel supply conduit of each said premix burner terminating in outlet ports short of a downstream open end of each burner sleeve enabling premixing of the air and fuel supplied to the burner sleeve via said fuel supply conduit and providing a substantially premix annular flame downstream of said burner sleeves surrounding and stabilized by the stabilized flame of the diffusion burner.