US1793849A - Tuyere for blast furnaces - Google Patents

Description

Feb, M, 1931- H. Es. GRONINGER TUYRE FOR BLAST FURNACES Original Filed May 28, 1929 INVENTOR www Patented Feb. 24, 1931 UNITED STATES HOLMES B. GEB, 0F TORI-I. ROYAL, PENNSYLVANIA 'rmanron nLAsr ruaNAons Continuation o! application Serial No. 368,545, med lay 88, 1829. This application med October 15, 1929. `Serial lo. 899,749.

This invention relates to improvements in tuyres particularly serviceable for blast furnaces, and consists in a 'modification of structure and which effects economy in manufacture and reduces the frequency of necessary replacements, and so increases the productiveness of the furnace. This application is a continuation of an application filed by me May 28, 1929, Serial No. 366,545.

The two figures of the accompanying drawings are fragmentary views in vertical section ofthe wall of a blast furnace with the tuyre of my invention in place within it. The tuyre is shown with minor differences in detail in the two figures. The blast furnace wall is essentially a `wall of masonry 1, into which wall of masonry at proper points are built Water-cooled rings 2 (known in the art as coolers) in which the tuyre are placed and through which the tuyres deliver their intended blasts of air. Tuyres hitherto employed in blast furnaces are tuyres which, when applied, are ixed in their positions within the water-cooled rings. It

is a characteristic of the tuyre of my invention that, instead of being fixed and immovable in its position in the water-cooled ring, itis susceptible to advance in axial direction when it is in place in the ring, and it is a further characteristic that the tuyre be such in character that under the wearing-away influence of the furnace heat it still continues to be serviceable. The tuyre, continuing in service through relatively long periods of time, may gradually be consumed as a candle is consumed, and, being fed forward as it is consumed, it may still continue to be serviceable.

The tuyre of my invention, as shown in the drawings, is advantageously of cylindrical shape externally, As. particularly shown in Fig. I, it consists of a tubular body 4 of refractory materialV contained within a cylindrical casing 3 of metal. The refractory materialA chosen will be such as to have the necessary coherence and, subject to inevitable wearing awa at its inner end, to endure the conditions o service. Material of suitable refractory` nature but lacking coherence may a consequent' adaptation to use,-

" able .vided within a be employed in the manner shown in Fig. Il'. he tuyre in this instance consists of a. doublefwalled shell 3, 5, having the space between the walls filled with a body 4. The vmaterial 4which comprises the filling 4 is a highly refractory material,-magnesite, for exam le, crushed and combined with a suitinder and rammed to position within the shell.; and the material of which the shell is formed is such as to give support to the body of rammed-in refractory, and to afford rigidity to the whole, adapting the article to conditions of handling, and to enable it to be fed axially through the coolin ring. Advantageously this double-walled s ell may be formed of cast steel, and in the form shown in Fig. I, the casing 3 may be formed of cast steel. A wedge-ring 30, having an inwardly tapering surface to abut the similarly tapered surface 20 of thel cooling ring, has an inner cylindrical surface 10 by which the tuyre is desirably supported. In furnace opera# tion the exposed end of the tuyre within the furnace often becomes coated with slag, or covered by a scum of metal which would prevent ready removal of the tuyre from the cooler, were it not for the wedgering. Obviously, the cooling ring 2 could be formed to provide a tuyre-supporting surface, but advantageously this surface is prowedge-ring which may unseat to give ample clearance as the wornout tuyre is withdrawn from the cooling ring. The drawings show the tuyre in place in the ring. It projects, as the tuyere of standard construction projects, through the ring in the furnace wall and into the furnace chamber. The inner end of the tuyre, the right-hand end, is exposed to the intense heat developed within the furnace as operation progresses, and, accordingly, the inward projecting end of the tuyre wastes away with relatively great rapidity. As the tuyre of my invention so wastes away, it is from time to time fed axially forward in direction from left to right. as seen in the drawing, and so maintained serviceable while its length diminishes. By Way of explanation, though not by Way of limitation, the tuyre when newly applied may be three feet long, more or less; and, when it is in place, it may project beyond the furnace wall and into the furnace chamber as much as nine to twelve inches. Y l

I have spoken of the withdrawal of the tuyre fg; m right to left through the cooler. Althougb9in the course of the serviceable life of a tuyre there may be occasion so to withdraw it, when it has so far wasted away that its usefulness is ended, a preferable procedure may be to drivethe stub of the tuyre forward and let it be lost in the furnace charge, and to replace it with a fresh tuyre introduced behind it'.

In Fig. I, I have shown .the wedge-ring 30 as a solid body; but manifestly, it too may be a hollow and water-cooledbody, in that respect of like construction with the cooler in which it rests, and it is so shown in Fig. II.

The tuyre is the nozzle of the blast pipe, and it will be understood that the connections through which the blast of, air is brought and delivered through the tuyre are adapted to admit of such progressive advance of the tuyre in axial direction, to compensate for the wearing away to which it is subjected. Such adaptation of the blast connections may manifestly be made in convenient manner.

I may form the shell 5 of the tuyre of Fig. 1I with a helical indentation 6 impressed upon it. Obviously, the so rifled inner cylindical wall of the tuyre will be effective to give a swirl to the blast of air as it enters the furnace. Such indentation, furthermore, will be an aid in retaining theY essential refractory body 4 between the two cylindrical walls.

It is preferred, in forming the tuyreof Fig. II to form the double-walled'shell closed surface adjustably borne by said cooling ring upon its said internal cylindrical surface.

5. In a blast furnace installation the combination of a cooling ring provided with a wedge-ring having an internal c lindrical bearing surface, and a tuyre provided with an exterior cylindrical surface adjustably borne by said wedge-ring upon its internal cylindrical surface. 'p i In testimony whereof I have hereunto set my hand.

HOLMES B. GRONINGER.

at one end, as at 7, and open at the opposite end (the end which becomes the inner endl in service), as the drawing shows, and

through this open end tb introduce and ram y the filling 4 of refractoi'ymaterial. It' couldl be a matter of no importance if the shell at .I the inner (right hand) end were closed and the opposite end left open for filling, for in service the closin web would in a very short time be consume Essentially, my tuyre is l an annulus or tube of refractory material. suitably carried in a metallic case.

-I claim as my invention:

1. A tuyre for ablast furnace including a support with a cylindrical opening adaptled to be set in the`furnace wall with its said opening extending through the wall, a cylindrical tube of refractory material arranged in the opening in the said support and progressively adjustable in an axial direction in such opening.

2. In a blast furnace structure andin combination with a cooling ring, a tuyre Consisting of an annulus of refractory material

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