GB901365A - Improvements in or relating to electric arc furnaces - Google Patents

Improvements in or relating to electric arc furnaces

Info

Publication number
GB901365A
GB901365A GB2553557A GB2553557A GB901365A GB 901365 A GB901365 A GB 901365A GB 2553557 A GB2553557 A GB 2553557A GB 2553557 A GB2553557 A GB 2553557A GB 901365 A GB901365 A GB 901365A
Authority
GB
United Kingdom
Prior art keywords
furnace
temperature
responsive means
power supplied
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2553557A
Inventor
Jack Ravenscroft
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Iron and Steel Research Association BISRA
Original Assignee
British Iron and Steel Research Association BISRA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Iron and Steel Research Association BISRA filed Critical British Iron and Steel Research Association BISRA
Priority to GB2553557A priority Critical patent/GB901365A/en
Publication of GB901365A publication Critical patent/GB901365A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1912—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can take more than two discrete values

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

901,365. Control systems for electric arc furnaces. BRITISH IRON & STEEL RESEARCH ASSOCIATION. Nov. 13, 1958 [Aug. 13, 1957; May 16, 1958], Nos. 25535/57 and 15783/58. Drawings to Specification. Class 38 (4). An electric arc furnace used for making steel comprises a control system whereby during the first stage of the melt the power supplied to the furnace is progressively increased in steps at intervals determined by a timing mechanism, whilst during the second stage of the melt the power supplied is progressively decreased in steps at intervals determined by the timing mechanism, heat-responsive means being associated with the furnace whereby the progressive decrease in the power supplied to the furnace cannot be implemented until the temperature of the furnace has reached a predetermined value. The alterations in the power supplied to the furnace are made by way of changes in the tappings on the supply transformer, the tapchanging apparatus being of the " off-load " type. The temperature or heat-responsive means may be arranged to be either responsive to the actual temperature of the molten metal or to the rate of increase of temperature of the roof of the furnace. The second stage of the melt period is followed by the refining period during which the furnace temperature increases. At the end of the refining period when the furnace temperature has reached a required value a second temperature-responsive means operates to further decrease the power supplied to the furnace. Should, however, the temperature increase still further the second temperature-responsive means will operate once more to still further reduce the power supplied to the furnace. During the normal changes in supplied power the second temperature-responsive means may over-ride the first temperature responsive means. Manually operated switches are provided whereby any of the power changing steps may be omitted or whereby the power changing step may be in the opposite direction to that which would normally take place. Lamps are provided showing indicated and actual power changes thus showing correct operation of the system. Specification 901,366 is referred to.
GB2553557A 1957-08-13 1957-08-13 Improvements in or relating to electric arc furnaces Expired GB901365A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2553557A GB901365A (en) 1957-08-13 1957-08-13 Improvements in or relating to electric arc furnaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2553557A GB901365A (en) 1957-08-13 1957-08-13 Improvements in or relating to electric arc furnaces

Publications (1)

Publication Number Publication Date
GB901365A true GB901365A (en) 1962-07-18

Family

ID=10229249

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2553557A Expired GB901365A (en) 1957-08-13 1957-08-13 Improvements in or relating to electric arc furnaces

Country Status (1)

Country Link
GB (1) GB901365A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660583A (en) * 1969-03-17 1972-05-02 Daido Steel Co Ltd Automatic rapid melting system and its application for arc furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3660583A (en) * 1969-03-17 1972-05-02 Daido Steel Co Ltd Automatic rapid melting system and its application for arc furnace

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