초록 ▼

A premix burner has a mixing plenum, a mesh flametrap and a ceramic honeycomb arranged in series. The mixing plenum has inner and outer chambers, with a mixing nozzle for introducing a gaseous fuel concentrically located in the inner chamber. The burner is operated with either high excess air or flu

A premix burner has a mixing plenum, a mesh flametrap and a ceramic honeycomb arranged in series. The mixing plenum has inner and outer chambers, with a mixing nozzle for introducing a gaseous fuel concentrically located in the inner chamber. The burner is operated with either high excess air or flue gas recirculation to produce a low temperature flame at a flame face defined by the honeycomb. The thorough premixing of air and fuel ensures a flame with homogeneous air-to-fuel ratios across the flame face, producing low NOx levels. The honeycomb and flametrap also function as flame arrestors to prevent burner flashback. A method for attaining a low temperature, low NOx flame using excess air, with or without flue gas recirculation, is also disclosed.

대표청구항 ▼

A single stage low NOx burner for producing a low temperature flame, comprising: a mixing plenum; a mesh flametrap adjacent said mixing plenum; a honeycomb downstream of and abutting said flametrap, said honeycomb having a plurality of axial passages therethrough, said honeycomb further defining a p

A single stage low NOx burner for producing a low temperature flame, comprising: a mixing plenum; a mesh flametrap adjacent said mixing plenum; a honeycomb downstream of and abutting said flametrap, said honeycomb having a plurality of axial passages therethrough, said honeycomb further defining a planar flame face at a downstream end of said burner, wherein said honeycomb is positioned between said planar flame face and said mesh flametrap; wherein gaseous fuel and excess air, with or without flue gas, are introduced to said mixing plenum, pass through said mesh flametrap and exit the passages of said honeycomb at said flame face where they are ignited to produce a low temperature flame; means for supplying air to said mixing plenum, a mixing nozzle extending into said mixing plenum for introducing the gaseous fuel to and a bluff body mounted in front of said mixing nozzle for deflecting gaseous fuel laterally into said air.