Frame for a blast furnace

Details Frame for a blast furnace Frame for a blast furnace

1999-05-20

2001-09-11

Kastler, Scott (Department: 1742)

Metallurgical apparatus

Geographic or structural installation

C266S198000

Reexamination Certificate

active

06287512

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a frame for supporting structural components of a blast furnace. The frame is composed of a bottom section connected to a foundation, a middle section and a top structure arranged above the furnace top, wherein the frame is manufactured as a latticework construction and/or framework construction and extends in four planes.
2. Description of the Related Art
Blast furnace frames of the above-described type serve to support own weight loads, traffic loads and crane loads and to hold structural components of the blast furnace, such as, the hot air distribution pipe and the gas discharge pipes. The steel structure of the frame is composed of a bottom section, a middle section and a top structure arranged above the furnace top. The loads are introduced into the foundation through the corner posts of the bottom section of the frame.
The dimensions of the bottom section of the frame depend on the location of the pool channels, the work areas of the blast furnace guns and the drilling machines, the diameter of the hot distribution pipe as well as any necessary travel areas.
External influences, such as wind loads or earthquakes, lead to relative movements between the furnace armor and the frame. Even though the frame has a very high weight, earthquakes may cause significant structural components, such as the gas discharge pipes or the hot air distribution pipe, to be torn off.
SUMMARY OF THE INVENTION
Therefore, starting from the prior art discussed above, it is the primary object of the present invention to propose a frame for a blast furnace which has a lighter weight and, thus, is more economical while providing a comparable load bearing capacity, wherein the frame provides an improved security with respect to external influences which may lead to relative movements between the furnace armor and the frame.
In accordance with the present invention, in a frame of the above-described type, this object is met by providing the bottom section of the frame in the four planes thereof with support members which extend toward each other and meet each other in a base point.
It has been found that the support members arranged in this V-shaped configuration lead to smaller relative movements between the frame and the furnace armor than is the case in frames with conventional corner posts of the bottom section of the frame. The smaller relative movements make possible a less expensive construction of the transition from the structural components to the frame. Finally, the V-shaped configuration of the support members make possible a more economical dimensioning of the frame.
If these frames are stiffened by horizontal and diagonal girders, the frame rests on four flat triangular discs which rest with the tips thereof in the base points.
An even lighter and, thus, more economical embodiment of the frame becomes possible if the bottom section and/or the middle section of the frame are structurally connected to the furnace armor. In that case, the furnace armor absorbs the horizontal loads acting on the frame. For example, the connection can be provided between the middle section of the frame and the furnace armor underneath the charging platform. As a result of this measure, the relative movement between the frame and the furnace armor is even further reduced. This results in a significantly improved safety in the case of an earthquake.
In order to ensure a uniform load introduction from the frame into the furnace armor, particularly in the case of an earthquake, an advantageous further development of the invention provides that coupling members are arranged in a horizontal plane and uniformly distributed over the circumference of the furnace armor.
However, the coupling members between the frame and the furnace armor are not only significant features in areas in which earthquakes may occur, rather, the coupling members facilitate smaller total dimensions of the frame and, thus, a more economical construction.
In order to further reduce the danger that the hot air distribution pipe tears off from the furnace, another development of the present invention provides that one or more of the structural components of the blast furnace, particularly the hot air distribution pipe, are connected to the frame.
Based on the finding that in the case of an earthquake a hot air distribution pipe has the behavior of a pendulum, it may be provided that the hot air distribution pipe is suspended from connecting rods in the frame and is held horizontally in the frame by coupling means.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.


REFERENCES:
patent: 3431691 (1969-03-01), Greaves et al.
patent: 3559972 (1971-02-01), Greaves

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