Patent US2375337A successfully refreshed from Google Patents.
Patent US3772504A successfully refreshed from Google Patents.
US3772504A
Expired / Lapsed
US
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Apparatus for operating a blast furnace
Assignee: United States Steel Corp
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Filing: 1971-12-23
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Granted: 1973-11-13
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Expires: 1991-12-23
Abstract
Abstract The apparatus includes means for comparing the rate of drop in the height of said burden with a predetermined normal rate of drop, means for indicating when the rate of drop in the burden height decreases a predetermined amount below normal, and means for indicating when the rate of drop in the burden height decreases a further predetermined amount below normal. Means are provided for determining when the blast pressure reaches a predetermined amount above normal and also for determining the rate of rise in the blast pressure. The pressure in the furnace is decreased when the blast pressure reaches the predetermined amount above normal, the rate of rise in the blast pressure reaches a predetermined value, and the rate of drop in the height of said burden decreases the first predetermined amount below normal, or when the blast pressure reaches the predetermined amount above normal and the rate of drop in the height of said burden decreases the second predetermined amount below normal.
Inventors
- 👤 H Debray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:10
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/006; G; G01; G01F; G01F23/00; G01F23/0023
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
In a blast furnace having a moving burden therein and including means for introducing pressurized blast air into said furnace adjacent the bottom, means for charging burden into the top of said furnace, means for measuring the height of said burden, means for measuring the pressure of said blast air and means for reducing the pressure in said blast furnace; the improvement comprising: means for determining the actual rate of burden movement, means for determining the difference between the actual rate of burden movement and a desired rate of burden movement, means for determining the rate of change of pressure of blast air, and means responsive to the difference between actual and desired burden movement rates exceeding a predetermined level and the blast air pressure exceeding a predetermined level and the rate of change of blast air pressure exceeding a predetermined level for actuating said pressure reducing means.
Claim 2
Dependent Claim
148 words
In a blast furnace having a moving burden therein and including means for introducing pressurized blast air into said furnace adjacent the bottom, means for charging burden into the top of said furnace, means for measuring the height of said burden, means for measuring the pressure of said blast air and means for reducing the pressure in said blast furnace; the improvement comprising: means for determining the actual rate of burden movement, means for determining the difference between the actual rate of burden movement and a desired rate of burden movement, means for determining the rate of change of pressure of blast air, and means responsive to the difference between actual and desired burden movement rates exceeding a predetermined level and the blast air pressure exceeding a predetermined level and the rate of change of blast air pressure exceeding a predetermined level for actuating said pressure reducing means.
Claim 3
Dependent Claim
124 words
In a blast furnace having a moving burden therein and including means for introducing pressurized blast air into said furnace adjacent the bottom, means for charging burden into the top of said furnace, means for measuring the height of said burden, means for measuring the pressure of said blast air and means for reducing the pressure in said blast furnace, the improvement comprising: means for determining the actual rate of burden movement, means for determining the difference between the actual rate of burden movement and a desired rate of burden movement, and means responsive to the difference between actual and desired burden movement rates exceeding a first predetermined level and the blast air pressure exceeding a predetermined level for actuating said pressure reducing means.
Claim 4
Dependent Claim
124 words
In a blast furnace having a moving burden therein and including means for introducing pressurized blast air into said furnace adjacent the bottom, means for charging burden into the top of said furnace, means for measuring the height of said burden, means for measuring the pressure of said blast air and means for reducing the pressure in said blast furnace, the improvement comprising: means for determining the actual rate of burden movement, means for determining the difference between the actual rate of burden movement and a desired rate of burden movement, and means responsive to the difference between actual and desired burden movement rates exceeding a first predetermined level and the blast air pressure exceeding a predetermined level for actuating said pressure reducing means.
Claim 5
Dependent Claim
70 words
The combination of claim 2 which includes means for determining the rate of change of pressure of blast air and means responsive to the difference between actual and desired burden movement rates exceeding a second predetermined level greater than said first level and the blast air pressure exceeding a predetermined level and the rate of change of blast air pressure exceeding a predetermined level for actuating said pressure reducing means.
Claim 6
Dependent Claim
46 words
The combination of claim 3 which includes an air delivery line in said means for introducing pressurized air into said furnace adjacent the bottom and in which said means for reducing the pressure in said blast furnace is a snort valve in said air delivery line.
Claim 7
Dependent Claim
50 words
The combination of claim 3 which includes a first alarm for indicating that the difference between the actual and desired burden movement rates exceeds the first predetermined level and a second alarm for indicating that the difference between the actual and desired burden movement rates exceeds the second predetermined level.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |