Heating – Work chamber having heating means – Combustion products heat work by contact
Patent
1993-12-08
1995-11-14
Okonsky, David A.
Heating
Work chamber having heating means
Combustion products heat work by contact
432252, 110173A, F27B 700
Patent
active
054661501
DESCRIPTION:
BRIEF SUMMARY
The present invention pertains to a sagger wall being called modular wall hereinafter, composed of a plurality of segments for a ring pit furnace, which is called modular furnace hereinafter.
For example, carbon or graphite electrodes are fired in soaking pit furnaces, which are usually designed as follows:
The furnace plant consists of a plurality of chambers, which are arranged in series and next to each other such that--viewed as an integral unit--they form an approximately annular shape. Each chamber is in turn subdivided into so-called modules or cassettes, which is achieved by arranging corresponding partitions.
The individual chambers are connected to one another such that the flue gases can be led from one chamber to the next. This is usually achieved by the so called sagger or modular walls having continuous flue gas channels, through which the flue gases flow from bottom to top and from top to bottom. To make possible this sinusoidal or meander-shaped gas flow, the individual chambers are closed with covers, and there is a hollow space between each chamber cover and the top ends of the modular walls, and this hollow space makes possible a gas flow, just as the hollow space formed under the modular bottoms.
One or two (of, e.g., 16 to 24 chambers) are designed as firing chambers during operation, while the chambers arranged in front of them--in the direction of flow of the flue gases--can be considered to be heating chambers, and the chambers located behind them can be considered to be cooling chambers.
The fired products are also removed and new, nonfired goods are introduced in the area of the chambers arranged behind the firing chambers when viewed in the direction of flow. The said electrodes are usually placed into a bed of filling powder, which makes possible, above all, a protection against oxidation.
Thermal expansions and contractions, which require suitable measures, inevitably occur due to the continual heating/cooling. It has been known that expansion joints can be arranged for this purpose, e.g., in the connection area between a transverse wall and a longitudinal wall. The corresponding expansion joints were then filled with ceramic fiber materials and covered. However, due to the thermal and mechanical load, the filling materials frequently have a very limited use time and are used up and must be replaced after, e.g., three firing cycles. Aside from this (undesired) maintenance cost, another aggravating circumstance is the fact the modular walls often have a height of 4 to 6 m, which makes it difficult to introduce the fiber materials in the area of the corner-side expansion joints.
It has now been found that two advantages can be achieved at the same time by placing the expansion joints away from the corner areas in the direction of the center of the modular walls and by a special design of the expansion joints: On the one hand, the expansion joints no longer need to be plastered, and, on the other hand, they are self-cleaning.
The present invention is based on the consideration that the expansion joints should be designed to be such that even though free mobility of adjacent components is guaranteed for absorbing the changes in length caused by thermal effects, the separation of adjacent modular spaces is ensured at the same time. In other words, the depth of the expansion joints shall be smaller than the thickness of the modular wall.
In its most general embodiment, the present invention discloses a modular wall composed of a plurality of segments for a modular furnace, wherein at least some of the segments have openings, which complement one another to form vertically extending, continuous flue gas channels, wherein at least two adjacent segments along each horizontal row of segments are designed and arranged such that they form expansion joints between them with their corresponding beveled front surfaces, and the said expansion joints expand from the inside to the outside, and a closed connection area is formed in the horizontal direction at right angles to the wall surface.
Bec
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patent: 5163831 (1992-11-01), Hammond
Albersdorfer Gernot
Swoboda Reiner
A. Earley John F.
A. Earley III John F.
Okonsky David A.
Riedhammer GmbH und Co. KG
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