Heating – Heating apparatus element having protective cooling structure
Patent
1984-01-16
1985-12-17
Camby, John J.
Heating
Heating apparatus element having protective cooling structure
122 6B, 266193, 432 77, F27D 112, F27D 1502, F22B 3700, C21B 710
Patent
active
045590117
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to cooling arrangements for shaft furnaces.
Known in the art is a cooling arrangement for blast furnaces (Japanese Patent Publication No. 45-14642, Nat. Cl. 10A521, published in 1970), comprising spaced apart metallic cooling tubes arranged so that with the cooling arrangement in position the tubes are adjacent to the furnace shell, are substantially parallel to its longitudinal generating line and are interconnected with metallic tie plates by welding, while the space between the cooling tubes and the tie plates interconnecting the same tubes is filled with a refractory material. In the prior art cooling arrangement, the cooling tubes extend along the height of the cooling zone of the furnace shaft and are interconnected by tie plates along both the height and the perimeter of the furnace shaft to thereby provide a rigid structure.
This structure is subjected to extreme thermal loads through the height and the perimeter of the furnace shaft. Under these conditions a rigid structure with the tubes interconnected as hereinabove described experiences considerable thermal stresses leading to break-away of the tie plates from the cooling tubes and, consequently, to gas leakage through the cooling arrangement followed by overheating of the furnace shell resulting its warping and wreckage.
Moreover, due to the structural features the prior art cooling arrangement poses problems in its construction since a stringent observance of its design characteristics is required. Construction of the cooling arrangement is further complicated by the fact that this can be carried out in the furnace only during major repairs or in constructing the furnace to thereby extend the repair (construction) period and to make use of a special-purpose equipment at the construction site. Furthermore, it is to be appreciated that the cooling arrangement is assembled in a restricted space.
It is also to be kept in mind that making such long welds produces more stresses throughout the structure.
During a furnace run, the refractory material disintegrates and falls down to uncover the cooling tubes and therefore to increase heat losses, which result in an excessive consumption of fuel.
The uncovered tubes are exposed to an abrasive action of the dusty gases and the charge materials.
SUMMARY OF THE INVENTION
The invention is directed to the provision of a cooling arrangement for shaft furnaces, which is more adapted to construction and whose resistance to mechanical and thermal loads is increased by changing the interconnection between the cooling tubes to thereby offer a reliable protection for the furnace shell from the action of the furnace atmosphere.
The invention provides a cooling arrangement for shaft furnaces, comprising at least two spaced apart metallic cooling tubes arranged so that with the cooling arrangement in position they are adjacent to the furnace shell, are substantially parallel to its longitudinal generating line, and are interconnected with metallic tie plates by welding, while the space between the cooling tubes and the tie plates interconnecting the same tubes is filled with a refractory material. Further, each tie plate is tangentially welded to an adjacent tube of at least two cooling tubes with at least one edge portion along the generatrix of the tube surface on the shell side and between adjacent tie plates along the height of the cooling arrangement there is a spacing extending along the length of the tie plate laterally of the cooling arrangement, the latter being embraced along the perimeter thereof by a metallic frame having walls extending along the cooling tubes and slotted their entire width to compensate for heat expansion.
Such arrangement provides a more reliable protection for the furnace shell since this arrangement has an increased resistance to mechanical and thermal loads due to a novel interconnection between the cooling tubes which lies in the fact that each tie plate is tangentially welded to the tubes with at least one edge portion
REFERENCES:
patent: 3687434 (1972-08-01), Dyskin et al.
Bannikov Jury G.
Bashinsky Kazimir D.
Bogoditsa Viktor P.
Golod Leonid D.
Gorbik Anatoly S.
Camby John J.
Vsesojuzny Nauchno-Issledovatelsky I Proektny Institut Pozovanij
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