Patent US3690632A successfully refreshed from Google Patents.
US3690632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blast furnace control based on measurement of pressures at spaced points along the height of the furnace
Assignee: Westinghouse Electric Corp
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Filing: 1970-12-30
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Granted: 1972-09-12
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Expires: 1990-12-30
Abstract
Abstract A system for automatically controlling the addition of moisture, the addition of enrichment fuels and/or the temperature of a hot blast for a blast furnace as a function of the ratio of (1) the pressure differential between the pressure in the furnace at the tuyeres and at a point slightly above the mantle to (2) the pressure differential at said point slightly above the mantle and that at the top of the furnace.
Inventors
- 👤 William A Munson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:25
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
In a system for controlling a characteristic of a hot blast for a blast furnace, the combination of means for producing electrical signals proportional to the pressure within the blast furnace at the bottom portion thereof, at the top portion thereof and at a point intermediate the top and bottom, computer means responsive to said electrical signals for determining the ratio of (1) the difference between the pressure at the bottom of the furnace and at said intermediate point to (2) the difference between the pressure at said intermediate point and that at the top of said furnace, and apparatus coupled to said computer means for controlling a characteristic of said hot blast as a function of said ratio of the pressure differentials to maintain a desired ratio of direct-to-indirect reduction within the furnace.
Claim 2
Dependent Claim
134 words
In a system for controlling a characteristic of a hot blast for a blast furnace, the combination of means for producing electrical signals proportional to the pressure within the blast furnace at the bottom portion thereof, at the top portion thereof and at a point intermediate the top and bottom, computer means responsive to said electrical signals for determining the ratio of (1) the difference between the pressure at the bottom of the furnace and at said intermediate point to (2) the difference between the pressure at said intermediate point and that at the top of said furnace, and apparatus coupled to said computer means for controlling a characteristic of said hot blast as a function of said ratio of the pressure differentials to maintain a desired ratio of direct-to-indirect reduction within the furnace.
Claim 3
Dependent Claim
19 words
The system of claim 1 wherein said point intermediate the top and bottom is directly above the furnace mantle.
Claim 4
Dependent Claim
18 words
The system of claim 1 wherein said characteristic which is controlled comprises the temperature of the hot blast.
Claim 5
Dependent Claim
98 words
The system of claim 3 including means in said computer means for producing a signal proportional to the ratio of said pressure differentials, means under the control of a furnace operator for producing a first signal proportional to desired hot blast temperature, means for producing a second electrical signal proportional to the actual hot blast temperature, means for modifying said first signal by said signal proportional to the ratio of said pressure differentials, and means for comparing said second signal with said modified first signal to derive an error signal for controlling the temperature of said hot blast.
Claim 6
Dependent Claim
19 words
The system of claim 1 wherein the characteristic which is controlled comprises the moisture content of the hot blast.
Claim 7
Dependent Claim
103 words
The system of claim 5 including means in said computer means for producing a signal proportional to the ratio of said pressure differentials, means under the control of a furnace operator for producing a first signal proportional to desired moisture content of the hot blast, means for producing a second signal proportional to actual moisture content of the hot blast, means for modifying said first signal by said signal proportional to the ratio of said pressure differentials, and means for comparing said second signal with said modified first signal to derive an error signal for controlling the moisture content of said hot blast.
Claim 8
Dependent Claim
22 words
The system of claim 1 wherein the characteristic which is controlled comprises the amount of enrichment fuels added to said hot blast.
Claim 9
Dependent Claim
106 words
The system of claim 5 including means in said computer means for producing a signal proportional to the ratio of said pressure differentials, means under the control of a furnace operator for producing a first signal proportional to desired enrichment fuel addition of the hot blast, means for producing a second signal proportional to actual enrichment fuel addition of the hot blast, means for modifying said first signal by said signal proportional to the ratio of said pressure differentials, and means for comparing said second signal with said modified first signal to derive an error signal for controlling the enrichment fuel addition of said hot blast.
Claim 10
Dependent Claim
52 words
The system of claim 1 including means for controlling the addition of enrichment fuels to said hot blast, means for controlling said hot blast temperature, means for controlling the moisture content of said hot blast, and electrical circuit apparatus responsive to said electrical signals proportional to pressure for regulating said control means.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |