Patent US3644076A successfully refreshed from Google Patents.
US3644076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid fuel burner
Assignee: Shell USA Inc
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Filing: 1970-05-01
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Granted: 1972-02-22
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Expires: 1990-05-01
Abstract
Abstract A liquid fuel furnace comprising a hollow coolant enclosure and at least a first annular oxidant channel therein adjacent to and concentric with a second annular liquid fuel channel inwardly of the first channel. A fuel supply opening is in communication with both of the channels and a bluff body is disposed downstream of the opening and retracted with respect to the end face of the enclosure thereby forming, together with the opening, an annular fuel and oxidant discharge duct common to the first and second channels.
Inventors
- 👤 Leonard P Bagge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:50
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/36; F23D11/10; F23D11/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
212 words
A burner for burning liquid fuel therein comprising: a hollow enclosure, having an outer wall and an end face, adapted to receive a coolant therein; said enclosure having a first annular channel extending therethrough spaced inwardly from said outer wall for receiving a flow of an oxidant therethrough and a second annular channel concentric with, adjacent to the inwardly of said first annular channel for receiving a flow of a liquid fuel therethrough, said second annular channel terminating before the end face of said enclosure and being in communication with said first annular channel; said communication between said first and second channels being by means including at least a first lateral fuel supply opening leading from one of said channels to the other; said burner including a bluff body having an end face disposed in said enclosure within said first annular channel between said fuel supply opening and said end face of said enclosure downstream of said fuel supply opening and retracted with respect to the end face of said enclosure and including downstream of said bluff body an annular discharge duct for fuel and oxidant common to said first and second annular channels; said first annular channel opening into said annular discharge duct at the end face of said bluff body.
Claim 2
Dependent Claim
212 words
A burner for burning liquid fuel therein comprising: a hollow enclosure, having an outer wall and an end face, adapted to receive a coolant therein; said enclosure having a first annular channel extending therethrough spaced inwardly from said outer wall for receiving a flow of an oxidant therethrough and a second annular channel concentric with, adjacent to the inwardly of said first annular channel for receiving a flow of a liquid fuel therethrough, said second annular channel terminating before the end face of said enclosure and being in communication with said first annular channel; said communication between said first and second channels being by means including at least a first lateral fuel supply opening leading from one of said channels to the other; said burner including a bluff body having an end face disposed in said enclosure within said first annular channel between said fuel supply opening and said end face of said enclosure downstream of said fuel supply opening and retracted with respect to the end face of said enclosure and including downstream of said bluff body an annular discharge duct for fuel and oxidant common to said first and second annular channels; said first annular channel opening into said annular discharge duct at the end face of said bluff body.
Claim 3
Dependent Claim
27 words
The burner of claim 1 wherein the bluff body has a flat end face substantially perpendicular to the direction of flow of oxidant through said first channel.
Claim 4
Dependent Claim
48 words
The burner of claim 2 wherein said second channel terminates in at least two fuel supply openings, a first fuel supply opening debouching laterally into the first channel upstream of the bluff body and second fuel supply opening debouching into the first channel downstream of the bluff body.
Claim 5
Dependent Claim
95 words
The burner of claim 1, wherein at least part of the first annular channel is subdivided by a partition wall into an inner part and an outer part, and wherein the terminal end of the second channel is subdivided into two zones, a first zone debouching through at least one lateral fuel supply opening upstream of the bluff body into the inner part of the first channel and a second branched-off zone leading through the partition wall and debouching through at least one lateral fuel supply opening into the outer part of the first channel.
Claim 6
Dependent Claim
80 words
The burner of claim 4, wherein the bluff body forms a portion of the partition wall which subdivides said first channel, wherein said wall extends throughout the first channel upstream Of the bluff body and wherein the second channel constitutes a passage within the wall terminating upstream of the bluff body into at least two lateral openings, one debouching into the inner part of the first channel and another opposite thereof debouching into the outer part of the first channel.
Claim 7
Dependent Claim
29 words
The burner of claim 1, including a third annular channel in said enclosure for providing pilot fuel thereto debouching into said first channel through at least one lateral opening.
Claim 8
Dependent Claim
23 words
The burner of claim 1, wherein the fuel supply opening is a circumferential slot in the wall dividing said first and second channels.
Claim 9
Dependent Claim
51 words
The burner of claim 1, wherein the annular discharge duct is conical with substantially constant cross section and diverging to the enclosure end face, wherein the terminal portion of the first annular channel is conical, and wherein the bluff body is disposed in the conical part of the first annular channel.
Claim 10
Dependent Claim
21 words
The burner of claim 1, including a substantially cylindrical flame chamber within said hollow enclosure downstream of said annular discharge duct.
Claim 11
Dependent Claim
16 words
The burner of claim 9, including means for axially adjusting the length of the flame chamber.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |