US3581070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for operating a shaft furnace by detecting the falling speed of the charge
Assignee: Nippon Steel Corp
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Filing: 1968-11-01
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Granted: 1971-05-25
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Expires: 1988-11-01
Abstract
Abstract This invention relates to a method and apparatus for always maintaining optimum operating conditions of a blast furnace by measuring the sinking speed of the charge and detecting deviations thereof from a predetermined sinking speed obtained statistically, superposing signals of logical operation obtained by the analysis of various factors representing operating conditions of the furnace on the signal representing the said deviation, and subjecting the blast conditions such as temperature and humidity of blast, amount of fuel and amount of blast to a pulse control and or stepped control according to the result of the superposition.
Inventors
- 👤 Keiji Tsujihata
- 👤 Masatoshi Shimada
- 👤 Hiromi Asai
- 👤 Yasuhiro Sawada
- 👤 Zensaku Ayuha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:04
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
190 words
A control means for carrying out the control of the operation of a blast furnace, comprising: computing means for computing the sinking speed of a charge in the blast furnace from a signal representative of the depth of the charge and produced by a conventional depth measuring appliance; detecting means coupled to said computing means for detecting a deviation of the computed sinking speed of the charge from a predetermined sinking speed and producing a signal representative of The direction of said deviation; signal superposing means coupled to said detecting means for superposing logical signals representative of factors affecting the furnace operating conditions on the signal representative of the direction of the said deviation of the sinking speed and producing a superposed signal; control means coupled to said signal superposing means for pulse-controlling and step-controlling blast conditions and charge conditions according to the superposed signal; and means coupled between said signal superposing means and said detecting means for revising the predetermined sinking speed according to the relation between the direction of the detected deviation of the measured sinking speed and logical signals representative of factors affecting the furnace operating conditions.
Claim 2
Dependent Claim
190 words
A control means for carrying out the control of the operation of a blast furnace, comprising: computing means for computing the sinking speed of a charge in the blast furnace from a signal representative of the depth of the charge and produced by a conventional depth measuring appliance; detecting means coupled to said computing means for detecting a deviation of the computed sinking speed of the charge from a predetermined sinking speed and producing a signal representative of The direction of said deviation; signal superposing means coupled to said detecting means for superposing logical signals representative of factors affecting the furnace operating conditions on the signal representative of the direction of the said deviation of the sinking speed and producing a superposed signal; control means coupled to said signal superposing means for pulse-controlling and step-controlling blast conditions and charge conditions according to the superposed signal; and means coupled between said signal superposing means and said detecting means for revising the predetermined sinking speed according to the relation between the direction of the detected deviation of the measured sinking speed and logical signals representative of factors affecting the furnace operating conditions.
Claim 3
Dependent Claim
229 words
A control apparatus for carrying out the control of the operation of a blast furnace, comprising: a computing circuit for receiving a signal representative of the position of the depth of a charge in the blast furnace and computing the sinking speed of the charge therefrom and produces a signal representative of the sinking speed; a deviation-detecting circuit coupled to said computing circuit for detecting the deviation of the computed sinking speed of the charge from a predetermined sinking speed and producing a signal representative of the direction of said deviation; a logical computing circuit coupled to said deviation detecting circuit for superposing logical signals representative of factors affecting furnace operating conditions on the signal indicating the direction of said deviation of the sinking speed and producing a superposed signal; a pulse-control circuit and a step-control circuit coupled to said logical computing circuit and adapted to be coupled to the blast furnace system and producing output signals for controlling blast conditions and charge conditions according to the superposed signal; and a set value revising control circuit coupled between said logical computing circuit and the deviation detecting circuit for revising the predetermined sinking speed used as a reference in said deviation detecting circuit according to the relation between the direction of the detected deviation of the measured sinking speed and logical signals representative of factors affecting the furnace operating conditions.
Claim 4
Dependent Claim
229 words
A control apparatus for carrying out the control of the operation of a blast furnace, comprising: a computing circuit for receiving a signal representative of the position of the depth of a charge in the blast furnace and computing the sinking speed of the charge therefrom and produces a signal representative of the sinking speed; a deviation-detecting circuit coupled to said computing circuit for detecting the deviation of the computed sinking speed of the charge from a predetermined sinking speed and producing a signal representative of the direction of said deviation; a logical computing circuit coupled to said deviation detecting circuit for superposing logical signals representative of factors affecting furnace operating conditions on the signal indicating the direction of said deviation of the sinking speed and producing a superposed signal; a pulse-control circuit and a step-control circuit coupled to said logical computing circuit and adapted to be coupled to the blast furnace system and producing output signals for controlling blast conditions and charge conditions according to the superposed signal; and a set value revising control circuit coupled between said logical computing circuit and the deviation detecting circuit for revising the predetermined sinking speed used as a reference in said deviation detecting circuit according to the relation between the direction of the detected deviation of the measured sinking speed and logical signals representative of factors affecting the furnace operating conditions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |