System using electric furnace exhaust gas to preheat scrap for s

Details System using electric furnace exhaust gas to preheat scrap for s System using electric furnace exhaust gas to preheat scrap for s

1985-04-09

1986-10-28

Rosenberg, Peter D.

Metallurgical apparatus

With control means responsive to sensed condition

With temperature sensor

75 101, 75 25, 75 44S, 266901, C22B 400

Patent

active

046196935

ABSTRACT:
Dust containing high-temperature gas exhausted from an electric steelmaking furnace is directed through scrap preheaters, wherein scrap that is to be charged into said electric furnace is preheated. The absorption of some of the heat from the exhaust leaving the electric furnace by the scrap, therefore, decreases the amount of electric power required for melting the steel scrap and also shortens the time required for steelmaking. Exhaust gas after preheating of the scrap is contaminated with incidental malodorous materials, e.g., paint and oil fumes, and is directed through a gas scrubber followed by a wet-type electric precipitator to remove these contaminants before release of cleaned exhaust gas into the atmosphere. A flow of alkaline aqueous solution of a deodorant solvent in the gas scrubber removes malodorous substances from the exhaust gas, simultaneously causing a drop in the gas temperature to a predetermined controlled value while generating a constant supply of saturated water vapor. Exhaust gas mixed with the saturated water vapor then flows through a wet-type electrostatic precipitator which collects oil mist attached to the water vapor and any small water droplets entrained therein. This purging of dust and malodorous constituents from the exhaust gas facilitates preheating of scrap for electric steelmaking processes, providing benefits of improved economy and reduced environmental air pollution.

REFERENCES:
patent: 3033673 (1962-05-01), Collin
patent: 3365340 (1968-01-01), Tisdale
patent: 3719471 (1973-03-01), Jones
patent: 3756804 (1973-09-01), Stevenson

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