Metallurgical apparatus – Means treating solid metal
Patent
1989-11-17
1992-04-21
Kastler, S.
Metallurgical apparatus
Means treating solid metal
266901, C21D 174
Patent
active
051060639
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a container for materials, preferably scrap iron for steel production and intended to be placed on a stand in a preheating station in order that the scrap iron shall be heated up to a high temperature, and comprising an essentially cylindric upper part and a lower part comprising openable bottom halves.
Scrap iron is usually utilized as a main raw material when producing steel by means of the electric steel method. In this connection as a rule a preheating of the scrap iron is made before it is brought to a furnace for melting. The preheating of the scrap iron being in the container is made in order to save energy and is made by means of flue gases from the furnace in which the scrap iron shall be melted or by means of flue gases from a combustion chamber provided with a burner.
When heating scrap iron the flue gas temperature and the heating time up to now have had to be limited due to the fact that the scrap iron containers do not have such a construction that they are suitable to use if the scrap iron has a high temperature. It is true that the container itself is made of a strong steel plate with thick walls so that it can resist loads in high temperatures, but since the container itself is intended to carry loads, its strength is considerably reduced when scrap iron is heated up to a high temperature by hot gases. An essential reason why the temperature of the container should be high if the scrap iron temperature were high is that the cooling of known containers and the surrounding details is not satisfactory. As a rule this cooling is made by gravity flow of the surrounding air.
SUMMARY OF THE INVENTION
This invention intends to remove the problems with the known technique. This has been achieved by a container of the kind mentioned by way of introduction, which can be used for materials, such as scrap iron, for steel production and which can be placed on a stand in a preheating station in order to heat the scrap iron to a high temperature. The container includes an essentially cylindrical upper part and a lower part comprising openable bottom halves. The container includes a shell for enclosing materials such as scrap iron and a load-carrying framework positioned outside the shell and functioning as a support for the shell. The load-carrying framework comprises means constituting channels for circulating a cooling medium and the bottom halves are cooled by the load-carrying framework.
Due to the fact that the container has been given the above construction, conditions are created for an active cooling of the same by means of gas and/or a liquid. Due to that fact the scrap iron in the container can be heated to a high temperature without any considerable increase of the temperature in the surroundings of the container or in the load-carrying frame-work, whereby the strength of the load-carrying frame-work is not considerably reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention shall be described more closely with reference to the accompanying drawings, in which
FIG. 1 shows a scrap iron container standing on a s a preheating station;
FIG. 2 shows a section of the scrap iron container along the line II--II of FIG. 1;
FIG. 3 shows horizontal sections through the scrap iron container on different levels;
FIGS. 4A and 4B show pictures of the container wall and adjacent parts;
FIG. 5 shows a principle diagram for cooling the container by a gas, for instance air; and
FIG. 6 shows a principle diagram for cooling the container by a liquid, for instance water.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIGS. 1-3 is shown a scrap iron container 1 having an essentially cylindrical, gas-tight shell 2 of a steel, which is resistant to high temperatures, and two projecting lifting taps 3 at its upper half for connection with a lift device. At its lower part the scrap iron container is provided with two bottom-halves 4, intended to be opened when the heated scrap iron shall be charged from the container. Accordi
REFERENCES:
patent: 3514279 (1970-05-01), Jensen et al.
patent: 3771775 (1973-11-01), Reinbold et al.
patent: 3852028 (1974-12-01), Reinbold et al.
patent: 4028048 (1977-06-01), Woolworth
patent: 4395280 (1983-07-01), Takenouchi et al.
patent: 4690638 (1987-09-01), Nakagawa et al.
ESSGE Systemteknik AB
Kastler S.
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