US3833356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for injecting oil into the tuyeres of a blast furnace
Assignee: Individual
•
Filing: 1971-10-21
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Granted: 1974-09-03
•
Expires: 1991-10-21
Abstract
Abstract A method and an apparatus for injecting oil into the tuyeres of a blast furnace preferably if the substitution ratio is above 50 to 100 kg oil/ton of pig iron. The oil is injected into the blast current with a speed at which it is not atomized when leaving the nozzle but injected as coherent jets, preferably in radial direction, maintaining their coherence a substantial distance in front of the nozzle. In this way the combustion of the oil is improved and its utilization can be increased to far greater amounts of oil which can be economically injected into the blast furnace in substitution of coke.
Inventors
- 👤 F Luth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:22
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B7/00; C21B7/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
The method as claimed in claim 1 wherein the exit speed of the fuel oil is at least 20 m/sec.
Claim 2
Dependent Claim
14 words
The method as claimed in claim 2 wherein the exit speed is 25 m/sec.
Claim 3
Dependent Claim
35 words
The method as claimed in claim 1 wherein the nozzle is positioned from the exit of the tuyere along the longitudinal axis of the tuyere a distance approximately equal to the diameter of the tuyere.
Claim 4
Dependent Claim
36 words
The method as claimed in claim 1 wherein the water is in the form of steam, 10 percent by weight is introduced, and the steam condenses to liquid after it is introduced into said fuel oil.
Claim 5
Dependent Claim
70 words
The method as claimed in claim 1 wherein some of the radial nozzle axes being at a 90* angle to the longitudinal axis and other of the radial nozzle axes, spaced downstream said 90* angle axes being inclined towards the direction of flow of the combustion air so that the coherent streams of oil injected through the nozzles impinge at a radial distance from the lance which augments the atomization.
Claim 6
Dependent Claim
45 words
The method as claimed in claim 1 wherein the oil stream remains coherent following a parabolic curve until about two-thirds of the radial distance from the nozzle exit to the inner wall of the tuyere has been traversed at which time the stream is atomized.
Claim 7
Dependent Claim
131 words
Apparatus for injecting fuel oil into a blast furnace or the like comprising a tuyere having a longitudinal axis and a smooth contInuous inner wall; an oil lance positioned along the axis of said tuyere; a cap on the end of the oil lance and an oil flow nozzle of gradually decreasing cross-section axially upstream said end so as to form an eddy chamber between the end of the cap and the oil flow nozzle; and at least one nozzle in the wall of the eddy chamber which nozzle has an axis directed radially outwardly so that the oil flows through the oil flow nozzle directly impinging against the end of the cap to cool same, changes direction in the eddy chamber and exits from the nozzle in a coherent stream.
Claim 8
Dependent Claim
112 words
Apparatus as claimed in claim 8 wherein there are a plurality of nozzles in the wall defining the eddy chamber; a first set of nozzles are arranged about the circumference, their axes being 90* to the longitudinal axis; a second set of nozzles arranged about the circumference intermediate said first set and the end of the cap, the axes of said second set being inclined upstream the gas flow in the tuyere so that the coherent streams of oil issuing from the second set of nozzles impinges the coherent streams of oil issuing from the first set at a radial distance from the nozzle exits to augment the atomization of the oil.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |