US3743752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of suppressing hot spot in arc furnace and apparatus therefor
Assignee: Daido Steel Co Ltd
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Filing: 1972-01-27
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Granted: 1973-07-03
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Expires: 1992-01-27
Abstract
Abstract A method of suppressing hot spots in an electric arc furnace particularly an electric arc furnace for use in steel making and an apparatus pertaining thereto, in which one or more water cooled boxes are provided in the furnace wall. The temperature of the inner wall of the box or of the cooling water is sensed. The power supply to the electrode or electrodes is adjusted in response to the sensed temperature.
Inventors
- 👤 H Furuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:03
CPC Classifications
F; F27; F27D; F27D11/00; C; C21; C21C; C21C5/00; C21C5/52; C21C5/5211; F27B; F27B3/00; F27B3/08; F27B3/085; F27D21/00; F27D21/0014; F27D9/00; F27D2009/0002; F27D2009/004; F27D99/00; F27D99/0001; F27D99/0006; F27D2099/0021; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
In a method for operating an electric arc furnace having at least one water cooled box in the furnace wall, said box having an inner wall constituting a portion of the interior wall of the furnace, the steps comprising: generating an electrical signal indicative of the temperature of said inner wall of said box; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 2
Dependent Claim
79 words
In a method for operating an electric arc furnace having at least one water cooled box in the furnace wall, said box having an inner wall constituting a portion of the interior wall of the furnace, the steps comprising: generating an electrical signal indicative of the temperature of said inner wall of said box; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 3
Dependent Claim
96 words
In a method for operating an electric arc furnace, the steps comprising: flowing cooling water through at least one box in the furnace wall, said box having an inner wall constituting a portion of the interior wall of the furnace; directly sensing the temperature of the surface of said inner wall of said box by temperature sensitive means in contact with said surface; generating an electrical signal indicative of said temperature; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 4
Dependent Claim
96 words
In a method for operating an electric arc furnace, the steps comprising: flowing cooling water through at least one box in the furnace wall, said box having an inner wall constituting a portion of the interior wall of the furnace; directly sensing the temperature of the surface of said inner wall of said box by temperature sensitive means in contact with said surface; generating an electrical signal indicative of said temperature; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 5
Dependent Claim
106 words
In a method for operating an electric arc furnace, the steps comprising: flowing cooling water through at least one box in the furnace wall, said box having an inner wall constituting a portion of the interior wall of the furnace; sensing the difference in the temperature of the cooling water entering and leaving the box; generating an electrical signal in response to said temperature difference which is indicative of the temperature of the surface of said inner wall of said box; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 6
Dependent Claim
106 words
In a method for operating an electric arc furnace, the steps comprising: flowing cooling water through at least one box in the furnace wall, said box having an inner wall constituting a portion of the interior wall of the furnace; sensing the difference in the temperature of the cooling water entering and leaving the box; generating an electrical signal in response to said temperature difference which is indicative of the temperature of the surface of said inner wall of said box; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 7
Dependent Claim
92 words
In a method for operating an electric arc furnace, the steps comprising: flowing cooling water through a plurality of boxes located in spaced-apart relation in the furnace wall, said boxes each having an inner wall constituting a portion of the interior wall of the furnace; sensing the temperatures of the cooling water leaving the respective boxes; generating an electrical signal in response to differences in said temperatures; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 8
Dependent Claim
92 words
In a method for operating an electric arc furnace, the steps comprising: flowing cooling water through a plurality of boxes located in spaced-apart relation in the furnace wall, said boxes each having an inner wall constituting a portion of the interior wall of the furnace; sensing the temperatures of the cooling water leaving the respective boxes; generating an electrical signal in response to differences in said temperatures; and adjusting the power supply to the electrode or electrodes of the furnace in response to said signal to suppress hot spots in the furnace.
Claim 9
Dependent Claim
128 words
In an electric arc furnace having wall means defining a melting chamber, electrode means extending into the chamber and electrical power supply circuitry for supplying power to the electrode means, the improvement which comprises: at least one water-cooled hollow box mounted in said wall means of said furnace; said box having a wall portion constituting a portion of the interior wall of the furnace; thermocouple means for sensing, and providing an electrical signal indicative of, the temperature of the inner surface of said wall portion of said box; and means in said circuitry for adjusting the power supply to the electrode means in response to said signal when the temperature sensed by the thermocouple is higher than a prescribed temperature, thereby to suppress hot spots in the furnace.
Claim 10
Dependent Claim
128 words
In an electric arc furnace having wall means defining a melting chamber, electrode means extending into the chamber and electrical power supply circuitry for supplying power to the electrode means, the improvement which comprises: at least one water-cooled hollow box mounted in said wall means of said furnace; said box having a wall portion constituting a portion of the interior wall of the furnace; thermocouple means for sensing, and providing an electrical signal indicative of, the temperature of the inner surface of said wall portion of said box; and means in said circuitry for adjusting the power supply to the electrode means in response to said signal when the temperature sensed by the thermocouple is higher than a prescribed temperature, thereby to suppress hot spots in the furnace.
Claim 11
Dependent Claim
133 words
In an electric arc furnace having wall means defining a melting chamber, electrode means extending into the chamber and electrical power supply circuitry for supplying power to the electrode means, the improvement which comprises: at least one hollow box mounted in said wall means of said furnace, said box having a wall portion constituting a portion of the interior wall of the furnace; means for flowing cooling water through said box; means for sensing the temperatures of the cooling water as it enters and as it leaves said box; and means in said circuitry for adjusting the power supply to the electrode means when the difference of the temperatures of the cooling water leaving and entering the box is greater than a prescribed temperature diffeRence, thereby to suppress hot spots in the furnace.
Claim 12
Dependent Claim
133 words
In an electric arc furnace having wall means defining a melting chamber, electrode means extending into the chamber and electrical power supply circuitry for supplying power to the electrode means, the improvement which comprises: at least one hollow box mounted in said wall means of said furnace, said box having a wall portion constituting a portion of the interior wall of the furnace; means for flowing cooling water through said box; means for sensing the temperatures of the cooling water as it enters and as it leaves said box; and means in said circuitry for adjusting the power supply to the electrode means when the difference of the temperatures of the cooling water leaving and entering the box is greater than a prescribed temperature diffeRence, thereby to suppress hot spots in the furnace.
Claim 13
Dependent Claim
128 words
In an electric arc furnace having wall means defining a melting chamber, electrode means extending into the chamber and electrical power supply circuitry for supplying power to the electrode means, the improvement which comprises: a plurality of spaced-apart hollow boxes mounted in said wall means of said furnace, each of said boxes having a wall portion constituting a portion of the interior wall of the furnace; means for flowing cooling water through said boxes; means for sensing the temperatures of the cooling water leaving the respective boxes, and means in said circuitry for adjusting the power supply to the electrode means when the temperature difference of the cooling water leaving the respective boxes is greater than a prescribed temperature difference, thereby to suppress hot spots in the furnace.
Claim 14
Dependent Claim
128 words
In an electric arc furnace having wall means defining a melting chamber, electrode means extending into the chamber and electrical power supply circuitry for supplying power to the electrode means, the improvement which comprises: a plurality of spaced-apart hollow boxes mounted in said wall means of said furnace, each of said boxes having a wall portion constituting a portion of the interior wall of the furnace; means for flowing cooling water through said boxes; means for sensing the temperatures of the cooling water leaving the respective boxes, and means in said circuitry for adjusting the power supply to the electrode means when the temperature difference of the cooling water leaving the respective boxes is greater than a prescribed temperature difference, thereby to suppress hot spots in the furnace.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |