Industrial electric heating furnaces – Plasma furnace device – Direct furnace
Patent
1989-05-12
1991-02-26
Envall, Jr., Roy N.
Industrial electric heating furnaces
Plasma furnace device
Direct furnace
373 25, H05B 700
Patent
active
049966944
ABSTRACT:
A method for melting iron and steel scrap wherein scrap is fed through a shaft furnace countercurrent to a reducing gas. The reducing gas is formed by passing air through a plasma generator and injecting coal and/or hydrocarbon into the hot air so that the ratio (CO.sub.2 +H.sub.2 O)/(CO.sub.2 +H.sub.2 O+CO+H.sub.2) of the resulting gas becomes less than 0.2. The energy needed for melting is supplied as sensible heat of the reducing gas. The energy for preheating the scrap is supplied by introducing oxygen containing gas into the preheating zone at a plurality of positions along the flow path of the reducing gas to provide stepwise combustion of the reducing gas. The introduction of the oxygen containing gas at said plurality of positions is balanced to keep the gas reducing to the metal scrap at scrap temperatures above 1000.degree. C., and preferably even above 800.degree. C. The invention also comprises an apparatus for carrying the method into effect, and the apparatus comprises means corresponding to the various method features above.
REFERENCES:
patent: 4019895 (1977-04-01), Santen
patent: 4340420 (1982-07-01), Santen et al.
Feinman Jerome
Santen Sven
Envall Jr. Roy N.
SKF Plasma Technologies AB
LandOfFree
Method and apparatus for melting iron and steel scrap does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for melting iron and steel scrap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for melting iron and steel scrap will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-298527