US2299575A - Tuyere - Google Patents

Description

Oct. 20, 1942. Q E sc 7 2,299,575

TUYERE Filed May 23, 1940 (Ha/P455 J FZE/ZCH,

Patented Oct. 20, 1942 UNITED STATES PATENT OFFICE 2,299,575 roman Charles J. Fleisch, Pittsburgh, Pa.

Application May 23, 1940, Serial No. 336,803

3 Claims. (Cl. 1226.6)

This invention relates to improvements in tuyeres for blast furnaces and the like, and more particularly relates to a water-cooled tuyere having a protective refractory back.

Blast furnace tuyres may become burned in use, and when such failure occurs, the present water-cooled tuyeres become dangerous to the operator and equipment. The water must be shut off to prevent discharge thereof into the furnace, whereupon the unprotected tuyere burns through and permits burning of the blowpipe and cooler parts, frequently resulting in what is known as a blow-out, whereby hot slag, coke, etc., are discharged through the damaged tuyre assembly.

My invention contemplates the provision of a protected tuyere which will prevent such hazards and insure greater safety to operators and equipment.

Another object i to provide more eflicient cooling for the tuyere by localization of the applied cooling medium, and at the same time, reducing the cooling effect of the tuyre upon the hot blast delivered thereby, resulting in a saving of fuel.

Additional objects and advantages will become apparent from the following description taken in connection with the accompanying drawing, wherein:

Figure 1 is a detail sectional view through the tuyere section of a blast furnace showing my improved tuyer mounted therein;

Figure 2 is an enlarged rear elevational view of the tuyere;

Figure 3 is a cross section on the line III-III of Figure 2;

Figure 4 is a cross section on' the line IV-IV of Figure 3;

Figure 5 is a rear elevational view of a modifled form of tuyere; and,

Figure 6 is a sectional view on the line VIVI of Figure 5.

Referring to the drawing, Figure 1 shows one form of my improved tuy-re A positioned in a blast furnace wall 5 in the customary mounting, including a cooler 6. Said tuyere and cooler are generally of frusto-conical shape and have coacting seating portions for positioning and retaining the tuyre in the furnace.

As shown in Figures 2 to 4. the tuyere A preferably comprises a double-walled annular body or shell of copper or other longitudinal blast passage I therethrough. The

metal, having a central forward or nose portion of the tuyere which exlar water-jacket 8 surrounding the forward portion of the blast passage 1. 9 designates a transverse partition wall defining the rearward extent of the water-jacket 8.

The rear portion of the tuyere A is provided with an external annular seating portion In for fitting sealing engagement with the cooler 6 as stated, and the rear wall H of the tuyere is formed with a tapered seat l2 surrounding the rear end of the passage I for seating the terminal of the hot blast blowpipe [3 as in Figure 1, said blowpipe supplying the heated air for the furnace from the usual source.

Surrounding the rear portion of the passage I and extending forwardly to the partition wall 9, I provide a refractory portion, preferably in the form of a refractory-containing jacket [4, utilizing the space between the walls of the shell or body in the region stated. Said refractory jacket is disposed in protective relation to the rear wall of the tuyere and the annular seat [0, and preferably extends longitudinally throughout at least one-half of the longitudinal length of the tuyere, the extent thereof being controlled by the location of the partition wall 9.

A powdered or granular refractory a may be employed for filling the refractory jacket l4 through provided access openings IS in the rear wall of the tuyre, the openings being closed by threaded plugs or the like after filling.

In the form of Figures 2 to 4, openings iii are provided in the rear wall of the tuyere communicating with provided longitudinal channels or passages l1 formed integrally with the tuyere body and extending through the refractory jacket for water circulation to and from the waterjacket 8 through communicating openings l8 in the partition wall 9. I

In the modification shown in Figures 5' and 6, the tuyere A is like that previously described excepting for the provision of a rear wall comprising openings and integral ribs, whereby a plastic refractory may be applied to the refractory jacket H. In this form, the water circulation for the water-jacket 8 is provided by a pair of conduits 20 extending from said rear wall through the partition wall 9.

. tends into the furnace is provided with an annu- From the foregoing it is apparent that I have provided a tuyre having a refractory jacket which serves to protect the rear portion of the tuyere even in the event the water-jacket burns and fails, the protection afforded by the refractory portion being maintained irrespective of whether the cooling water is shut off or not. The location of the refractory jacket at the rear portion of the tuyere adequately protects the juncture with the cooler 6 and the blow-pipe i3, preventing the latter from being burned.' Also, by maintaining the juncture with the cooler, slag, etc., will not be discharged or blown out therebetween.

Further, by reducing the extent of the waterjacket, I have concentrated the cooling circulation of water at the region where the same is most effective and essential. Also, the reduced cooling area has a correspondingly reduced cooling effect upon the hot blast delivered by the tuyere.

Various modifications and changes are contemplated within the scope of the following claims.

I claim:

1. A tuyre comprising a hollow body having a central longitudinal passage therethrough and having a rear outer seating portion, a water-m cooled nose portion surrounding the forward. portion only of said passage, a protective refractory portion surrounding the rear portion of the passage, said refractory portion extending rearwardly from and isolating the water-cooled nose, and protecting the seating portion of the tuyre and the tuyere body inthe event of burning of the nose.

2. A tuyre comprising a hollow body having a central longitudinal passage therethrough and having a rear outer seating portion, a watercooled nose portion surrounding the forward portion only of said passage, a protective refractory portion surrounding the rear remaining portion of the passage, said refractory portion extending longitudinally throughout at least one-half of the longitudinal dimension of the tuyere, isolating the water cooled nose and protecting the seating portion of the tuyere and the tuyere body in the event of burning of the nose.

3. A tuyre comprising a double-walled annular metal body having a central longitudinal blast passage therethrough and having a rear outer seating portion, the forward portion of the douhie-walled body about said passage comprising a water-jacket forming a water-cooled nose, 9. partition wall defining the rearward extent of said water-jacket, refractory filling the remainder of the space between the walls of the body and forming a refractory portion surrounding the rear portion of the passage, isolating said watercooled nose and protecting the seating portion of the tuyere and the tuyre body in the event of burning of the nose, said body having access openings in the rear thereof for introducing the refractory material thereto, and water conduits extending from said partition wall to the rear of the body and in communication with said water-jacket.

CLES J. FLEISCH.

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