Industrial electric heating furnaces – Arc furnace device – Furnace body detail
Patent
1999-09-27
2000-12-19
Hoang, Tu Ba
Industrial electric heating furnaces
Arc furnace device
Furnace body detail
373 79, 373 80, 373 9, F27D 100
Patent
active
061635618
DESCRIPTION:
BRIEF SUMMARY
FIELD OF APPLICATION
This invention concerns a cooled basket for steel plants.
The cooled basket according to the invention is used to load and subsequently unload scrap in cooperation with electric furnaces or other plants for melting metals.
The cooled basket according to the invention is suitable to cooperate with plants for the pre-heating of scrap which employ the exhaust fumes generated by the furnace and, advantageously, with systems which automatically manage the operations of pre-heating, positioning, unloading into the furnace and repositioning.
STATE OF THE ART
In melting plants in steel works which use systems to load the furnace of a discontinuous type, the state of the art covers the use of containers, known as baskets, which are filled with scrap to be sent for melting, emptied inside the furnace and then taken back to the area where the scrap is loaded.
Such baskets include at the lower part means which can be momentarily opened such as blades, teeth, valves or similar, which open when the basket is placed in correspondence with the mouth of the furnace to let the scrap contained inside come out.
It is also well-known in the state of the art that, in order to reduce melting times and to improve the efficiency of the first steps of the cycle inside the furnace, the scrap in the basket, before being unloaded, is subjected to pre-heating by using the fumes leaving the furnace.
These fumes are usually conveyed into the appropriate rooms where the baskets are to be found; the latter are gradually removed full of hot scrap and then returned full of cold scrap.
The use of tower-type containers is also known; they are placed on movable trolleys near the melting furnace and can be moved from a pre-heating position to a position wherein the hot scrap is unloaded into the furnace.
These containers are loaded either by conveyor belts which are costly and also take up considerable space, or by baskets manipulated by bridge cranes which unload the scrap from above the container itself.
If the container is loaded from above, very high sheds are required, which are not usual, and these require heavy and costly structures which are made for the purpose.
The pre-heating procedure brings a plurality of advantages because the furnace is thus fed with scrap already at the correct temperature.
However, when pre-heating is carried out in the basket, it also brings some disadvantages caused by the excessive and dangerous over-heating of the walls and the bottom of the basket.
Given the high temperatures of the fumes which come to surround the basket, and possibly are made to circulate inside thereof, there are considerable increases in temperature even in the containing structure, which involves operational problems in the manipulation and movement of the basket.
Moreover, together with the fumes, also powders, slag and other dirt is conveyed inside the basket, and, as these pass through the scrap they can cause the pieces of scrap to stick together, and therefore difficulties in unloading the scrap from the basket into the furnace.
When the scrap is unloaded into the furnace, it falls violently and causes immense blasts of heat to escape from the furnace itself; these hit the basket and cause further, unwanted damage.
Moreover, during unloading abundant amounts of powders, particles and other pollutant substances escape from the furnace and contaminate the area around the mouth of the furnace.
A further problem with baskets for scrap as are known to the state of the art concerns the manipulation and the manipulation times which lengthen the times of the tap-to-tap cycle.
Yet another problem is the low efficiency of the transfer of heat energy from the fumes to the scrap.
The applicant does not know of any baskets for scrap used for loading melting systems which are able to obviate all the above-mentioned disadvantages.
The state of the art includes U.S. Pat. No. 5,106,063 which describes a cooled container for scrap to be unloaded into a melting furnace.
This container comprises substantially an inner casing
REFERENCES:
patent: 3336020 (1967-08-01), Palsak
patent: 3385584 (1968-05-01), Kemmetmueller
patent: 3880648 (1975-04-01), Forrest
patent: 4160117 (1979-07-01), Schempp
patent: 4506370 (1985-03-01), Yoshimatsu
patent: 4690638 (1987-09-01), Nakagawa et al.
patent: 4736383 (1988-04-01), Meierling
patent: 5106063 (1992-04-01), Granstrom
patent: 5153894 (1992-10-01), Ehle et al.
patent: 5390212 (1995-02-01), Bonnet et al.
patent: 5416792 (1995-05-01), Vice
Simulationsmodell zur Berechnung der Schrott-vorwarmung mit gestufter Nachverbrennung, Liuyi Zhang Und Franz Oeters: vol. 115, No. 5 May 15, 1995, pp 75-82.
Benedetti Giampietro
Della Negra Angelico
Gensini Gianni
Pavlicevic Milorad
Poloni Alfredo
Danieli & C. Officine Meccaniche SpA
Hoang Tu Ba
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