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US3739989A Expired / Lapsed US ⏱️ 0.0 years remaining

Duct burner for operation with liquid or gaseous fuels

Assignee: John Zink Co LLC
•
Filing: 1972-07-19
•
Granted: 1973-06-19
•
Expires: 1992-07-19
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Abstract

Abstract An air augmented liquid or gaseous fuel burner having a hollow post mounting a plurality of fuel discharge nozzles spaced over the length of the post and a combustion chamber aligned with each discharge nozzle. An air plenum is disposed about the nozzle, the post and the combustion chamber. An upstream end of the nozzle is connected to a liquid fuel pressure reducer having relatively large cross sectional passageways for reducing the pressure of the liquid fuel supplied from a manifold. The discharge nozzle includes a liquid fuel atomizing core which employs an atomizing plate together with an air flow entering the nozzle interior through apertures in the nozzle housing from within the hollow post. For gaseous fuel operation of the burner the gas is passed through the hollow post and the bores in he nozzle housing for a discharge towards the combustion chamber. Suitable air inlets between the nozzle discharge end and the combustion chamber are provided for admixing the discharged fuel with sufficient air to sustain the growth of the jet issuing from the nozzle. The air plenum is so constructed that it induces eddy currents within the combustion chamber.

Inventors

  • 👤 R Vosper

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 05:19
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/10; F23D17/00

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 158 words
An atomizing nozzle comprising an elongate housing having upstream and downstream ends and a substantially cylindrical interior, an orifice plate at the downstream end, means disposed in the housing interior for discharging liquid fuel towards the orifice plate, means for combining the discharged liquid fuel with a flow of air entering the housing from the housing exterior adjacent the liquid fuel discharGe, an atomizer plate disposed downstream of the interior discharge member for atomizing the liquid fuel in the air flow, aperture means in said atomizer plate adjacent its outer periphery for whirling said fuel and air, means for passing the atomized liquid flow towards the orifice plate, and means for enveloping the atomized liquid fuel flow in a coaxial air flow surrounding the atomized liquid fuel flow when it passes the orifice plate to prevent contact between the liquid fuel flow and the nozzle and to thereby prevent the formation of liquid fuel droplets on the nozzle.
Claim 2
Dependent Claim 158 words
An atomizing nozzle comprising an elongate housing having upstream and downstream ends and a substantially cylindrical interior, an orifice plate at the downstream end, means disposed in the housing interior for discharging liquid fuel towards the orifice plate, means for combining the discharged liquid fuel with a flow of air entering the housing from the housing exterior adjacent the liquid fuel discharGe, an atomizer plate disposed downstream of the interior discharge member for atomizing the liquid fuel in the air flow, aperture means in said atomizer plate adjacent its outer periphery for whirling said fuel and air, means for passing the atomized liquid flow towards the orifice plate, and means for enveloping the atomized liquid fuel flow in a coaxial air flow surrounding the atomized liquid fuel flow when it passes the orifice plate to prevent contact between the liquid fuel flow and the nozzle and to thereby prevent the formation of liquid fuel droplets on the nozzle.
Claim 3
Dependent Claim 31 words
A nozzle according to claim 1, including means for introducing a liquid fuel flow into the nozzle, and pressure reducing means between the nozzle means and a liquid fuel supply conduit.
Claim 4
Dependent Claim 39 words
A nozzle according to claim 2 wherein the pressure reducing means comprises means defining a plurality of angularly disposed, relatively large cross section passageways causing a substantial pressure drop between an upstream and a downstream end of the passageways.
Claim 5
Dependent Claim 60 words
A nozzle according to claim 3 wherein the passageway defining means comprises a tubular member, and a snugly fitting pore member disposed interiorly of the tubular member and having a plurality of axially spaced annular spaces and a plurality of inclined grooves interconnecting the annular spaces, grooves terminating at the same annular space extending nonparallel away from the annular space.
Claim 6
Dependent Claim 31 words
A nozzle according to claim 4, wherein the grooves extending from a given annular space have an angular inclination with respect to each other of no more than about 90* .

References Cited (Backward Citations)

US1451063A Cited
US2107365A Cited
US3070317A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-06-18 1976-12-18 1977-06-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-06-18 1980-12-18 1981-06-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-06-18 1984-12-18 1985-06-19 $7700.00 Window Closed / Lapsed

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