Heating – Tumbler-type rotary - drum furnace
Patent
1986-02-27
1987-02-10
Yuen, Henry C.
Heating
Tumbler-type rotary - drum furnace
110101CC, 110226, 110255, 432222, F27B 700, F23K 300
Patent
active
046420487
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This United States application stems from PCT International Application No. PCT/KR85/0014 filed June 24, 1985.
TECHNICAL FIELD
The present invention relates generaly to an apparatus for steel making furnaces and, more particularly, to the apparatus for continuously preheating and charging raw materials such as direct reduced iron (DRI) or small lumps of pig iron, if necessary, ferro-alloy or quick lime etc. By using the heat induced from the waste gas of the electric arc furnace.
BACKGROUND ART
There has been a tendency to use direct reduced iron or small lumps of pig iron for producing qualified steel products. In a conventional electric furnace, several methods have been used to charge raw materials into the furnace. One of them is to batch-charge raw materials together with steel scrap into the furnace by use of a bucket or to consequently charge them from hopper to the charging hole of the furnace roof through weigh conveyor. However, it has a disadvantage that the waste heat generated from the furnace is not utilized efficiently due to the direct exhaust into the atmosphere through the conventional bag house instead of being used to preheat raw materials, and therefore it does not contribute to efficient energy utilization and cost reduction.
Heretofore, it has been desired to improve the virginity of steel products by diluting various impurities of the steel scrap through direct reduced iron or small lumps of pig iron so as to remove undesirable effects on steel products caused by the impurities, continuously charge raw materials into furnace so as to reduce time consumption occured by batch charging with bucket and eliminate boiling phenomena which occur at the time when charging direct reduced iron together with steel scrap through a bucket, and use the same duct which permits flowing the waste gas generated from the steel making furnace as well as charging the direct reduced iron into the furnace.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide an improved apparatus for continuously preheating and charging raw materials which avoids the disadvantages of prior techniques, while affording additional advantages.
The invention in its broad form comprises a waste gas guiding duct 1 connected to one side of swing roof 3 of electric furnace 2, a rotating duct 4 spaced apart from said guiding duct 1, an inserting duct 12 insertable into said guiding duct 1, a connecting duct 17 arranged to be lifted to a predetermined level and guided by the guide rail 19, a fixing duct 14 fixed at the lower end portion of the linear duct 4, a branch duct 24 arranged at the upper end portion of a linear duct 4 and bifurcated as a waste gas exhaust duct 23 and feed chute 22 provided with a control damper 20 and a hopper 21, a belt conveyor 26 provided with integral weighing means 27, and a bucket conveyor 25 merged into the storage 29 having a screen 28 at lower end portion thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
A more detailed understanding of the invention can be had from following description of the preferred embodiment, given by way of example and to be understood in conjunction with the accompanying drawings wherein:
FIG. 1 is a perspective view of the apparatus for continuously preheating and charging raw materials according to the invention;
FIG. 2 is a sectional view of the apparatus shown in FIG. 1; and
FIG. 3 is a partial enlarged perpective view of the apparatus, showing the connecting duct.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the several drawings, especially to FIG. 1, there is illustrated the raw material preheating and charging apparatus constructed in accordance with and embodying the features of the present invention.
Refractories are provided on the inner surface of the waste gas guiding duct 1 connected to the roof 3 of electric furnace 2.
The rotating duct 4 spaced apart from the duct 1 is rotated by the gear 5 provided on central outter periphery thereof and the gear 7 operated through it
REFERENCES:
patent: 3785304 (1974-01-01), Stookey
patent: 4063903 (1977-12-01), Beningson et al.
patent: 4339998 (1982-09-01), Finch
patent: 4437418 (1984-03-01), Guillaume et al.
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