High efficiency radiant heater
AssigneeThomas & Betts International, Inc.
InventorsGlyn Wilfred Turner, Lee Brian Herbert
Life of this patent
Estimating the term…
Abstract
A radiant tube heater with a burner assembly, a radiant tube assembly and a combustion air pre-heater; wherein the burner assembly comprises: a burner fuel nozzle; a plenum chamber and a pre-mixer chamber; the plenum chamber having a combustion air inlet; wherein in use: combustion air flows from said plenum chamber through an orifice to said pre-mixer where said air is mixed with burner fuel entering said pre-mixer through said nozzle prior to being combusted at a burner head; said pre-mixer being at least partly located within said radiant tube assembly; and where in use at least part of the combustion air supplied to said plenum is preheated in said air pre-heater using residual sensible heat of the hot combustion gas products of the heater.
Claims10
A radiant tube heater assembly including a radiant tube heater;
- and a separate combustion air pre-heater, where in use combustion air is preheated using residual sensible heat provided by hot combustion gas products generated by said radiant tube heater, the radiant tube heater further comprising:
- a fuel gas and primary air pre-mixer assembly including a pre-mixer tube and a fuel gas injection nozzle located proximal a first end of said pre-mixer tube, said injection nozzle having a plurality of radial outlets, and a burner head having an inner portion and a surrounding portion, said inner portion being located at the downstream end of said pre-mixer tube, and said inner portion of said burner head comprising an array of orifices, wherein, when a flame is formed, the base of the flame is located on a downstream face of said inner portion of said burner head, and
- a secondary air annular channel that surrounds said pre-mixer tube, said outer portion of said burner head being located at a downstream end of said annular channel, said outer portion of said burner head comprising a ring of circumferentially spaced apertures that extends radially outwardly beyond said inner portion of said burner head, such that, when in use, the secondary air impinges on the outer radial boundary of the flame formed on the downstream face of said inner portion of said burner head and thus provides secondary air to said flame.
Dependencies are inferred from the claim text.