Method of preheating scrap

Details Method of preheating scrap Method of preheating scrap

1989-06-12

1991-03-19

Kastler, S.

Metallurgical apparatus

Process

75581, 266901, 266156, C21B 722

Patent

active

050004255

ABSTRACT:
The scrap that is to be charged into an electric arc furnace is preheated by a gas in a closed circuit and this gas is heated in a heat exchanger by the exhaust fumes from the furnace. A minor part of the circulating gas is continuously led off to a burner in which it is burnt with a gas as fuel at such a high temperature that rest products such as dioxines are destroyed. The exhaust fumes from the burner is supplied to the exhaust fumes of the furnace upstream of the heat exchanger. In another burner, another minor part of the circulating gas is continuously burnt with a gas fuel at a substantially lower temperature so that hydrocarbons in the circulating gas burn. The exhaust fumes from the burner are returned to the closed circuit.

REFERENCES:
patent: 3163520 (1964-12-01), Collin et al.
patent: 4113977 (1978-09-01), Hochstrasser et al.
patent: 4249721 (1981-02-01), Udo
patent: 4548651 (1985-10-01), Ramsey
patent: 4687440 (1987-08-01), Wells

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