Furnaces – Wall structure
Reexamination Certificate
2000-08-31
2001-09-11
Bennett, Henry (Department: 3749)
Furnaces
Wall structure
C266S285000, C432S251000
Reexamination Certificate
active
06286442
ABSTRACT:
The present invention relates to a support device for a furnace, particularly the bottom furnace of a flash smelting furnace.
DESCRIPTION OF THE PRIOR ART
Typically furnaces used in the production of metals, for example flash smelting furnaces, comprise a furnace space with walls typically lined with fire-resistant material. Around the furnace walls, there is typically arranged a supporting construction comprising, among others, vertical support pillars that are spaced apart and provide support for the furnace walls, among others. The pillars are arranged to be flexibly attached to other support structures, so that they allow the movement of the furnace walls that is caused by thermal expansion. The furnace is arranged on top of a foundation that also supports the rows of vertical support pillars. A flash smelting furnace has a bottom part preferably provided with a curved top surface, which is curved, starting from the centre part, upwardly towards the side walls. The side walls are typically structural elements arranged at the bottom part edges by means of a joint that allows the shifting of the walls caused by thermal expansion. Underneath the furnace wall support pillars, there are provided so-called base plates bedded in a concrete foundation. At the bottom part, the side wall support pillars have extended as far as the base plates. The support pillars are attached to the support structures by means of flexible elements. When the furnace temperature is high, the side wall support pillars have shifted, along with the side walls, when the flexible elements have allowed, both up and away from the furnace, so that an aperture has formed between the support pillar and the base plate. The support structures according to the prior art require a foundation extending to underneath the vertical support pillars, which in addition to space also requires a lot of construction material. The aperture created between the pillars and the base plate collects dirt and is a drawback also from the esthetical point of view.
BRIEF SUMMARY OF THE INVENTION
The object of the invention is to realise a completely new support device arrangement, whereby the drawbacks of the prior art are avoided.
The arrangement according to the invention is characterised by what is set forth in the appended claims.
The arrangement according to the invention has several remarkable advantages. Now the furnace foundation does not have to extend underneath the vertical support pillars, in which case both concrete and steel needed in the base plates is saved. Cleaning is easier, because underneath the furnace pillars there are not left small apertures that are difficult to keep clean. When the arrangement according to the invention is applied to the renewing of old furnaces, a new and a larger furnace can be built on top of the old foundation. The direction of the wall pillar, caused by the movement of the furnace walls, is easier to control than before. By making the support surface in the form of a slot, there is obtained a simple and secure solution for controlling the motion of the support pillar. When a pin element is used as a counterpart, there is realised an easily attachable and simple arrangement that is particularly well suited to be used together with the slot serving as the support surface. Said counterpart can also advantageously be used as a fastening point for the pull bar of the fastening device.
The invention is explained in more detail below with reference to the appended drawings, where
REFERENCES:
patent: 1710257 (1929-04-01), Haniman
patent: 2420126 (1947-05-01), Curll et al.
patent: 3190818 (1965-06-01), Otto
patent: 3295280 (1967-01-01), Kettner
patent: 4240234 (1980-12-01), Eisenger et al.
patent: 4369032 (1983-01-01), Lowrance et al.
patent: 4773630 (1988-09-01), Carminati et al.
Bennett Henry
Morgan & Finnegan , LLP
Outokumpu Oyj
Rinehart K. B.
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