Patent ID: 6752620
Filing Date: 2004-06-22
Classification: F23C,F23D,F23M

Abstract:
A device for stabilization of a flame in a combustion apparatus, comprising:(a) a primary oxidant pipe having a primary oxidant pipe internal surface and a primary oxidant pipe forward end; (b) a fuel pipe having a fuel pipe internal surface, a fuel pipe external surface, and a fuel pipe forward end, said fuel pipe disposed at least partially internal to said primary oxidant pipe, wherein a hollow primary oxidant flow conduit is formed between said fuel pipe external surface and said primary oxidant pipe internal surface; (c) a secondary oxidant pipe having a secondary oxidant pipe external surface and a secondary oxidant pipe forward end, said secondary oxidant pipe disposed at least partially internal to said fuel pipe, wherein a hollow fuel flow conduit is formed between said secondary oxidant pipe external surface and said fuel pipe internal surface, and wherein said secondary oxidant pipe has an internal, secondary oxidant conduit; (d) a primary oxidant flow source for supplying oxidant at a first oxidant flow velocity to said primary oxidant conduit; (e) a fuel flow source for supplying a fuel at a fuel flow velocity to said fuel flow conduit; (f) a secondary oxidant flow source for supplying oxidant at a second oxidant flow velocity to said secondary oxidant conduit; (g) wherein said first oxidant flow velocity is greater than said second oxidant flow velocity and said fuel flow velocity is less than said second oxidant flow velocity; and (h) wherein said primary oxidant pipe end extends past said fuel pipe forward end and said fuel pipe forward end extends past said secondary oxidant pipe end; whereby a mismatch in velocity between flowing fuel and flowing oxidant generates a large scale vortex of the oxidant and fuel as they mix.