US3816063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for heating industrial furnaces
Assignee: RECH SCHENTIFIQUES ET MINIERES
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Filing: 1972-12-21
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Granted: 1974-06-11
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Expires: 1992-12-21
Abstract
Abstract The invention relates to a process and apparatus for heating industrial furnaces wherein liquid fuel oil at a temperature of 250*C. to 500*C. and a pressure of 8 to 50 bars is mixed with a quantity of primary air amounting to 25 to 60 percent of the amount required for complete combustion, and this mixture is subsequently mixed with a quantity of secondary air amounting to 15 to 35 percent of the amount required for complete combustion.
Inventors
- 👤 M Hicguet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:57
CPC Classifications
F; F23; F23C; F23C99/00; F23D; F23D11/00; F23C2700/00; F23C2700/02; F23C2700/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A process for heating industrial furnaces with vapors produced by expansion of hot liquid fuel oil under pressure, comprising: providing liquid fuel oil at a temperature of 250* to 500*C, under a pressure of 8 to 50 bars, injecting said heated and pressurized fuel oil into a precombustion and heating chamber which is in free communication with the interior of a furnace, thereby expanding and vaporizing said fuel oil in said chamber, introducing air into said chamber in the immediate vicinity of the fuel inlet thereto and introducing the resulting mixture into the interior of the furnace.
Claim 2
Dependent Claim
97 words
A process for heating industrial furnaces with vapors produced by expansion of hot liquid fuel oil under pressure, comprising: providing liquid fuel oil at a temperature of 250* to 500*C, under a pressure of 8 to 50 bars, injecting said heated and pressurized fuel oil into a precombustion and heating chamber which is in free communication with the interior of a furnace, thereby expanding and vaporizing said fuel oil in said chamber, introducing air into said chamber in the immediate vicinity of the fuel inlet thereto and introducing the resulting mixture into the interior of the furnace.
Claim 3
Dependent Claim
27 words
A process as set forth in claim 1, in which said air is primary air, and secondary air is introduced at a distance from the fluid inlet.
Claim 4
Dependent Claim
54 words
A process as set forth in claim 2, in which the rate of introduction of air relative to the amount of air required for complete combustion of the fuel oil is 25 to 60 percent in the case of the primary air and 15 to 35 percent in the case of the secondary air.
Claim 5
Dependent Claim
29 words
A process as set forth in claim 3, in which the rate of introduction of primary air represents 35 to 40 percent of the amount required for complete combustion.
Claim 6
Dependent Claim
24 words
A process as set forth in claim 4, in which the liquid fuel oil is provided at a temperature of 280* C to 400*C.
Claim 7
Dependent Claim
15 words
A process as set forth in claim 1, wherein the air is heated before introduction.
Claim 8
Dependent Claim
19 words
A process as set forth in claim 6, wherein the air is heated to at least 250*C. before introduction.
Claim 9
Dependent Claim
25 words
A process as set forth in claim 6, wherein the air is introduced hot only during the light up phase of the furnace operating cycle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |