Scrap preheating system for an electric furnace

Details Scrap preheating system for an electric furnace Scrap preheating system for an electric furnace

1982-08-24

1984-10-23

Camby, John J.

Heating

Work chamber having heating means

Combustion products heat work by contact

373 80, 432 28, 432 72, 432179, F27D 1700

Patent

active

044785747

ABSTRACT:
This disclosure relates to a system for preheating scrap before charging in an electric furnace and for preventing the release of malodorous or noxious gas. The system includes a first duct leading from the furnace exhaust gas outlet to a chimney; a branching duct is connected in the first line for passing part of the gas to the chimney and for diverting the remainder of the gas to a scrap preheater. After preheating the scrap, the diverted gas is recirculated back to the first line at a junction which is adjacent the furnace outlet. The system further includes gas combustion means connected in the first line between the junction and the branching duct, and a heat equalizer-accumulator in the first line between the combustion means and the chimney. The system may further include a heat exchanger connected in the first line downstream of the branching duct and a second line for passing the diverted gas through the heat exchanger after it leaves the scrap preheater. A temperature responsive device may be connected in the first line for adjusting the amount of the diverted gas.

REFERENCES:
patent: 3870474 (1975-03-01), Houston
patent: 4242084 (1980-12-01), Jamaluddin
patent: 4280836 (1981-07-01), Maeda
patent: 4375958 (1983-03-01), Date et al.

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