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Efficient use of power in electric arc furnaces

Journal Article:

Abstract

The maximum transfer of electric energy to the metal in an arc furnace depends on the length of arc and the impedance of the electrical supply system from the generators to the arc itself. The use of directly-reduced sponge iron by continuous feeding results in long periods of flat-bath operation, when it is particularly important to keep a short high-current arc to get the heat into the metal rather than to the refractories, which would suffer excessive wear. By reference to a 125 ton furnace, a method of assessing the optimum operating currents and power factors and the effects of differing power-supply systems is illustrated. The importance of a low-impedance power system is illustrated, and the possibility of being unable to use the maximum furnace power without excessive refractory wear is noted. The particular problems of connecting arc-furnace loads to electrical supply systems are reviewed, and consideration is given to the problem of voltage flicker. The use of compensators is discussed with reference to existing installations, in which strong supplies from the supply-authority system are not economically available. The furnace operating characteristics, which indicate the optimum points of working, have to be checked on commissioning, and the test procedures are  More>>
Publication Date:
Feb 01, 1978
Product Type:
Journal Article
Reference Number:
ERA-04-023680; EDB-79-037117
Resource Relation:
Journal Name: Electr. Power Appl., IEE J.; (United Kingdom); Journal Volume: 1:1
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ARC FURNACES; ENERGY EFFICIENCY; PERFORMANCE; METAL INDUSTRY; AUTOMATION; CONTROL SYSTEMS; ECONOMICS; OPERATION; OPTIMIZATION; POWER DEMAND; PRODUCTION; STEELS; ALLOYS; EFFICIENCY; FURNACES; INDUSTRY; IRON ALLOYS; IRON BASE ALLOYS; 320303* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes
OSTI ID:
6520315
Research Organizations:
McLellan and Partners, Consulting Engineers, London, England
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: IJEAD
Submitting Site:
TIC
Size:
Pages: 17-24
Announcement Date:

Journal Article:

Citation Formats

Freeman, E R, and Medley, J E. Efficient use of power in electric arc furnaces. United Kingdom: N. p., 1978. Web.
Freeman, E R, & Medley, J E. Efficient use of power in electric arc furnaces. United Kingdom.
Freeman, E R, and Medley, J E. 1978. "Efficient use of power in electric arc furnaces." United Kingdom.
@misc{etde_6520315,
title = {Efficient use of power in electric arc furnaces}
author = {Freeman, E R, and Medley, J E}
abstractNote = {The maximum transfer of electric energy to the metal in an arc furnace depends on the length of arc and the impedance of the electrical supply system from the generators to the arc itself. The use of directly-reduced sponge iron by continuous feeding results in long periods of flat-bath operation, when it is particularly important to keep a short high-current arc to get the heat into the metal rather than to the refractories, which would suffer excessive wear. By reference to a 125 ton furnace, a method of assessing the optimum operating currents and power factors and the effects of differing power-supply systems is illustrated. The importance of a low-impedance power system is illustrated, and the possibility of being unable to use the maximum furnace power without excessive refractory wear is noted. The particular problems of connecting arc-furnace loads to electrical supply systems are reviewed, and consideration is given to the problem of voltage flicker. The use of compensators is discussed with reference to existing installations, in which strong supplies from the supply-authority system are not economically available. The furnace operating characteristics, which indicate the optimum points of working, have to be checked on commissioning, and the test procedures are outlined. The optimum points for each type of charge and steel can be assessed only during their actual production. The importance of proper recording of relevant data is stressed, and reference is made to the use of computers and automatic power-input controllers.}
journal = {Electr. Power Appl., IEE J.; (United Kingdom)}
volume = {1:1}
journal type = {AC}
place = {United Kingdom}
year = {1978}
month = {Feb}
}