Apparatus and method of preheating steel scrap for a twin shell

Details Apparatus and method of preheating steel scrap for a twin shell Apparatus and method of preheating steel scrap for a twin shell

1994-06-21

1996-07-30

Hoang, Tu

Industrial electric heating furnaces

Environmental control

Arc furnace

373 80, 75 1038, F27D 2300

Patent

active

055419526

ABSTRACT:
Apparatus and methods of abating the objectionable emissions of volatile hydrocarbons generated during the preheating cycle of a twin vessel electric arc furnace steelmaking operation wherein the vessels cycle between a powered or melting state and an unpowered state. During the unpowered state, scrap charged to the non-powered vessel is preheated. The spent off-gases from the non-powered vessel may contain toxic and/or noxious hydrocarbons therein by virtue of certain plastics and/or grease/oils mixed with the scrap being preheated. The spent off-gas from the preheat vessel is delivered to a combustion chamber to be mixed with a hot off-gas diverted from the powered vessel. The temperature of the mixed off-gases in the combustion chamber is raised to a critical temperature to burn/crack the objectionable hydrocarbons, which may include dioxins and furans. The temperature of the spent off-gas can be increased more rapidly during initial melting stages by employing burners in the preheat vessel and/or by decreasing the size of the scrap charge and increasing the molten heel left in the non-powered vessel after tapping.

REFERENCES:
patent: 3612739 (1971-10-01), Korneff
patent: 3880648 (1975-04-01), Forrest
patent: 4531971 (1985-07-01), Sugiura et al.
patent: 4706258 (1987-11-01), Sugiura et al.
patent: 5264020 (1993-11-01), Ehle et al.

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