초록 ▼

A staged, high efficiency burner for gaseous, liquid or pulverized solid fuels (including fuels having a high nitrogen content) in which NOX emissions are minimized. The burner includes a burner basket having a base including a throat and a concentric, tubular, frustroconically shaped wall that defi

A staged, high efficiency burner for gaseous, liquid or pulverized solid fuels (including fuels having a high nitrogen content) in which NOX emissions are minimized. The burner includes a burner basket having a base including a throat and a concentric, tubular, frustroconically shaped wall that defines a primary combustion space. The fuel and primary air of about 75% of stoichiometric air are introduced into the basket which has a length so that the fuel has a residence time therein of between about 0.1 to 0.5 second. Secondary air is introduced into the flame downstream of the basket in the form of a multiplicity of individual air streams which are oriented to penetrate the flame and spin it about its axis so as to maintain a substantially cylindrical flame periphery. Part of the secondary air can be introduced through the tubular wall of the basket to shorten the flame length while maintaining the low level NOX emissions and the high efficiency of the burner by directing that part of the secondary air into the primary space so that the formation of pockets which have a high or excess air content cannot form. The flame basket can be disposed fully within the combustion chamber of the furnace or, to prevent it from penetrating excessively into the chamber, part of the basket can be disposed outside the chamber.

대표청구항 ▼

A burner basket for use with a low NOX, high efficiency fuel burner, the basket comprising: a base defining a longitudinal basket axis and including a burner throat of a sufficient size to permit the introduction of the fuel and an off-stoichiometric amount of primary combustion air, a tubular wall

A burner basket for use with a low NOX, high efficiency fuel burner, the basket comprising: a base defining a longitudinal basket axis and including a burner throat of a sufficient size to permit the introduction of the fuel and an off-stoichiometric amount of primary combustion air, a tubular wall extending generally transversely away from the base in surrounding relation to the throat, a free-end of the wall defining an outlet for the basket, a plurality of heat radiating cut-outs in the wall at least a portion of which extends upstream from the basket outlet to permit heat from a flame in the basket to radiate substantially perpendicular to a longitudinal axis of the basket to heat transfer surfaces surrounding the basket when installed in a furnace, and a multiplicity of secondary combustion air conduits terminating proximate the basket outlet for discharging streams of secondary combustion air into a section of the flame formed by the fuel and disposed downstream of the basket outlet, wherein the conduits are oriented so that secondary air streams issuing therefrom are tangential to an imaginary cylinder which is concentric to the longitudinal axis so that the secondary airstreams impart a rotary motion to the section of the flame.