Metallurgical apparatus – Means for introducing fluent into vessel – e.g. – tuyere – Having means preventing damage to introducing means – e.g.,...
Patent
1988-10-21
1989-09-12
Mc Dowell, Robert
Metallurgical apparatus
Means for introducing fluent into vessel, e.g., tuyere
Having means preventing damage to introducing means, e.g.,...
1101825, 285114, 285226, C21B 716
Patent
active
048652989
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tuyere stock for a blast furnace. In a blast furnace, pre-heated gas, usually air, is injected into the furnace from one common supply pipe mounted around the furnace by way of a number of tuyere injection nozzles which are located on the periphery of the furnace. Each nozzle is connected to the supply pipe by what is known as a tuyere stock.
Under the effect of the high temperature of the air or gas blown into the furnace through the tuyeres, in use, the tuyere stock is subjected to considerable expansion effects. It is an object of the present invention to provide a tuyere stock in which effects due to expansion and distortion can be accommodated.
According to the present invention, a tuyere stock for a blast furnace comprises three serially arranged pipes with a first flexible bellows unit connected to the first and second pipes and a second flexible bellows unit connected to the second and third pipes and a pair of elongate links positioned on opposite sides of the second pipe and each connected at its ends through spherical bearings to the first and third pipes, respectively, thereby permitting limited movement between the first and third pipes in two mutually normal directions both of which are normal to the longitudial axes of the links.
The links, even if they are fitted with pivot bearings, as opposed to spherical bearings, would permit pivotal and lateral relative movement between the first and third pipes in a direction at right angles to the longitudinal axes of the links. By providing spherical bearings, however, lateral movement in a second direction at right angles to the first-mentioned direction is permitted in the direction normal to the longitudinal axes of the links.
Each pipe is lined with refractory material and the adjacent ends of the refractory material in the first and second pipes are of co-operating arcuate form to permit relative angular movement therebetween and the adjacent ends of the refractory material in the second and third pipes are of co-operating arcuate form to permit relative angular movement therebetween.
Furthermore, the end of the lining of the first pipe is preferably of convex arcuate form and projects into the second pipe and the end of the lining of the second pipe is of convex arcuate form and projects into the third pipe.
In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a side elevation of a tuyere stock for a blast furnace; and
FIG. 2 is an elevation, partly in section, in the direction of the arrow X in FIG. 1.
Referring particularly to FIG. 1, a blow pipe 1 which is urged into engagement with a tuyere 3 of a blast furnace 5 is connected through an elbow pipe 7 to the lower end of a tuyere stock 9. The upper end of the stock is connected to a manifold 11 through which hot gas, usually air, is passed. The tuyere stock enables hot high pressure air from the manifold to be injected into the tuyere 3. Clearly, in use, both in the environment surrounding a blast furnace and due to the fact that hot gas is passed through it, the tuyere stock is subjected to thermal expansions when it is in use. The portion of tuyere stock connected between the manifold 11 and the elbow 7 is sometimes referred to as the down-leg.
Referring more particularly to FIG. 2, the lower end of the manifold has a flange 13 and to this is bolted a flange 15 at one end of a first axially short metal pipe 17. This pipe is arranged serially in end-to-end relation with a second metal pipe 19 and a third metal pipe 21 is in end-to-end relation with the second pipe. The adjacent ends of pipes 17, 19 are connected to opposite ends of a flexible bellows 23. Similarly, the lower end of the second pipe and the adjacent end of the third pipe are connected to opposite ends of a flexible bellows 25. The bellows permit a limited amount of relative movement between the pipes in their axial direction. The pipes are lined with refractory material 27 and a
REFERENCES:
patent: 3980286 (1976-09-01), Mahr et al.
patent: 4027605 (1977-06-01), Legille
patent: 4212253 (1980-07-01), Voituriez et al.
Patent Abstracts of Japan, vol. 1, No. 67, 1073 c77, Jun. 1977, Appln. 52-30203, Jul. 1977.
Davy McKee (Stockton) Limited
Mc Dowell Robert
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