Metallurgical apparatus – With cleaning or lubricating means
Reexamination Certificate
2002-03-08
2004-02-10
Andrews, Melvyn (Department: 1742)
Metallurgical apparatus
With cleaning or lubricating means
C266S155000
Reexamination Certificate
active
06689309
ABSTRACT:
The present invention relates to an apparatus according to claim
1
for clearing dust accretions in connection with a smelting furnace.
Sulfur dioxide containing gases discharged from a smelting furnace, such as a suspension smelting furnace, are typically conducted to a waste heat boiler and further to an electric filter. However, in waste heat boilers connected to suspension smelting, there occur dust accretions owing to the high dust content of exhaust gases, and said dust accretions cause difficulties for the operation of the waste heat boiler as well as for the whole suspension smelting process. Possible losses caused for the producers by interruptions in the suspension smelting process owing to said difficulties are extremely large. The removal of dust accretions has been attempted by many different methods, among which a few are mentioned in the FI patent 74,738. A typical location for dust accretions to be accumulated is the area around the connecting aperture between the uptake shaft of a smelting furnace, such as a flash smelting furnace, and the waste heat boiler. From time to time, dust accretions must be removed from the area of said connecting aperture. This work takes time and is troublesome, because accretions have been removed manually and for instance by means of exploding.
The object of the invention is to realize a novel solution for clearing dust accretions from the connecting area between a smelting furnace and a waste heat boiler, by means of which method the drawbacks of the prior art can be avoided.
The invention is characterized by what is set forth in the appended claims.
The apparatus according to the invention has several remarkable advantages. When the wall part is arranged to be movable, the dust accretion layers can be removed outside the contact area, which speeds up the cleaning process and thus reduces the maintenance time. When clearing means are arranged in connection with the wall elements, the clearing step can be automated, which further reduces the time spent in the cleaning process. If the clearing means are provided at the edge of the aperture or in the vicinity thereof, there is ensured that the location is advantageous and that the accretion particles are dropped in the furnace space and into the waste heat boiler. When the clearing means constitute at least one clearing blade, there is achieved an effective clearing apparatus that is well suited to the conditions of usage. When cooling is arranged in the wall element, and advantageously in the conduit element, too, there is realized an apparatus that operates in an excellent fashion in the conditions of usage. By arranging the wall element surface to be indined at least in one direction, it is possible to control the outlet direction of the accretion partides that are removed from the wall surface and thus to make the wall cleaning process more effective. By means of the apparatus according to the invention, there is achieved a remarkable improvement in the removal of dust accretions in connection with a smelting furnace.
REFERENCES:
patent: 4475947 (1984-10-01), Andersson
patent: 4908058 (1990-03-01), Saarinen
patent: 5741130 (1998-04-01), Hagstrom et al.
patent: 1 109 414 (1981-09-01), None
patent: 3541873 (1987-01-01), None
patent: 3 541873 (1987-01-01), None
patent: 596728 (1996-02-01), None
patent: 1 74738 (1987-11-01), None
patent: 2669104 (1992-05-01), None
patent: 2 215 714 (1989-09-01), None
patent: 89/03967 (1989-05-01), None
Andrews Melvyn
Morgan & Finnegan , LLP
Outokumpu Oyj
LandOfFree
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