Cylindrical burner apparatus and method
AssigneeGastech Engineering LLC
InventorYul E. Shaffer
Life of this patent
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Abstract
A cylindrical burner apparatus and method which produce low NOx emissions and low noise levels without being dependent upon a blower, or natural draft, for providing air flow or flue gas recirculation. A flow of combustion air is induced into the initial tube pass of the burner by discharging a gas fuel from a plurality of discharge ports located in the initial tube pass. At the same time, a flow of recycled flue gas is induced through a bypass duct between a subsequent tube pass of the burner and the initial tube pass by discharging one or more jets of gas fuel through the bypass duct.
Claims28
A cylindrical burner apparatus comprising:
- an initial tube pass having a longitudinal axis and a rearward end;
- a first fuel ejection structure or assembly, or an array of ejector elements, comprising a plurality of primary fuel jet discharge ports positioned in the initial tube pass forwardly of the rearward end, at least some of the primary fuel jet discharge ports discharging jets of a gas fuel which induce a flow of combustion air into the initial tube pass through the rearward end:
- a subsequent tube pass downstream of the initial tube pass;
- a flue gas recirculation duct having an inlet in fluid communication with an interior of the subsequent tube pass and a discharge in fluid communication with an interior of the initial tube pass;
- and
- a second fuel ejection structure or assembly, or an array of ejector elements, comprising one or more secondary fuel jet discharge ports, each of the one or more secondary fuel jet discharge ports discharging a jet of the gas fuel which induces a flow of a recycled flue gas through the flue gas recirculation duct from the interior of the subsequent tube pass to the interior of the initial tube pass.
A cylindrical burner apparatus comprising:
- a tube having a longitudinal axis and a rearward end;
- an ejection structure or assembly, or an array of ejector elements, comprising a set of fuel jet discharge ports positioned in the tube forwardly of the rearward end, the fuel jet discharge ports discharging jets of a gas fuel which induce a flow of combustion air into the tube through the rearward end;
- a plurality of flame stabilization structures positioned in the tube downstream of the fuel jet discharge ports and
- at least some of the fuel jet discharge ports being oriented such that the jets of the gas fuel discharged therefrom are directed toward the flame stabilization structures.
A method of operating a cylindrical burner, without forced air and without, dependence on natural draft, while also producing low NOx emission and noise levels, the method comprising the steps of:
- a) inducing a flow of combustion air into a rearward end of an initial tube pass by discharging jets of a gas fuel from a plurality of fuel discharge ports positioned in the initial tube pass forwardly of the rearward end, the initial tube pass having a longitudinal axis, and
- b) inducing a flow of recycled flue gas from a subsequent tube pass into the initial tube pass, via a flue gas recirculation duct extending between the subsequent tube pass and the initial tube pass, by discharging one or more jets of the gas fuel which travel through the flue gas recirculation duct.
Dependencies are inferred from the claim text.