US5113771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverized coal fuel injector
Assignee: United States Department of Energy
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Filing: 1991-08-14
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Granted: 1992-05-19
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Expires: 2011-08-14
Abstract
Abstract A pulverized coal fuel injector contains an acceleration section to improve the uniformity of a coal-air mixture to be burned. An integral splitter is provided which divides the coal-air mixture into a number separate streams or jets, and a center body directs the streams at a controlled angle into the primary zone of a burner. The injector provides for flame shaping and the control of NO/NO 2 formation.
Inventors
- 👤 Michael J. Rini
- 👤 David P. Towle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:47
CPC Classifications
F; F23; F23D; F23D1/00; F23D1/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
138 words
A pulverized coal injector for a coal combustor comprising: a) a burner tube having a central axis, an upstream end, a downstream end, and a primary burn zone adjacent to the downstream end, and further wherein said tube is capable of carrying a stream of a pulverized coal-air mixture to be burned, b) an acceleration means located in the tube for improving the uniformity of the coal-air mixture; c) a converging means connected to the downstream end of the tube for injecting the coal-air mixture into the primary burn zone of the combustor, said converging means including means for splitting the stream of the coal-air mixture into a plurality of separate streams; d) and further wherein said splitting means directs the separate streams to impinge upon each other upon discharge into the primary burn zone of the combustor.
Claim 2
Dependent Claim
138 words
A pulverized coal injector for a coal combustor comprising: a) a burner tube having a central axis, an upstream end, a downstream end, and a primary burn zone adjacent to the downstream end, and further wherein said tube is capable of carrying a stream of a pulverized coal-air mixture to be burned, b) an acceleration means located in the tube for improving the uniformity of the coal-air mixture; c) a converging means connected to the downstream end of the tube for injecting the coal-air mixture into the primary burn zone of the combustor, said converging means including means for splitting the stream of the coal-air mixture into a plurality of separate streams; d) and further wherein said splitting means directs the separate streams to impinge upon each other upon discharge into the primary burn zone of the combustor.
Claim 3
Dependent Claim
50 words
The coal injector of claim 1 wherein the converging means is a nozzle coupled between the burner tube and the primary burn zone of the combustor, and wherein the nozzle includes a plurality of passages for splitting the stream of the coal-air mixture into a corresponding plurality of separate streams.
Claim 4
Dependent Claim
40 words
The coal injector of claim 2 wherein the passages converge toward the central axis of the burner tube such that the plurality of separate streams impinge upon each other upon being discharged into the primary burn zone of the combustor.
Claim 5
Dependent Claim
47 words
The coal injector of claim 3 further including an axially disposed, rounded body located at the downstream end of the burner tube, said body disposed to direct the coal-air mixture at a controlled angle relative to the central axis of the burner toward the plurality of passages.
Claim 6
Dependent Claim
25 words
The coal injector of claim 4 wherein the acceleration means is defined as a convergence of the burner tube upstream from the center body portion.
Claim 7
Dependent Claim
65 words
The coal injector of claim 5 wherein the nozzle includes an inlet side and an outlet side, and each of said passages includes an entry portion at the inlet side for receiving the separate streams, and a discharge portion at the outlet side for discharging the separate streams, and wherein the discharge portion of the passages is inclined toward the central axis of the burner.
Claim 8
Dependent Claim
21 words
The coal injector of claim 6 wherein the nozzle includes eight passages for dividing the coal-air mixture into eight separate streams.
Claim 9
Dependent Claim
32 words
The coal injector of claim 7 wherein the passages of the nozzle are inclined at an angle of about seven and one-half degrees with respect to the central axis of the burner.
Claim 10
Dependent Claim
28 words
The coal injector of claim 8 wherein the separate streams of coal-air mixture impinge upon each other about eight inches downstream from the outlet side of the nozzle.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |