US3174739A

US3174739A - Nose for furnace tap-hole runner

Info

Publication number: US3174739A
Application number: US214417A
Authority: US
Inventors: Miller Reuben
Original assignee: United States Steel Corp
Current assignee: United States Steel Corp
Priority date: 1962-08-02
Filing date: 1962-08-02
Publication date: 1965-03-23
Anticipated expiration: 1982-03-23

Description

March 23, 1965 R. MILLER Nos: FOR FURNACE TAP-HOLE RUNNER Filed Aug. 2, 1962 INVENTOR. REUBEN MILLER "Mak Affarney United States Patent O 3,174,739 NSE FR FURNACE TAP-HLE RUNNER Reuben Miller, Chicago, Ill., assigner to United States Steel Corporation, a corporation of New Jersey Filed Aug. 2, 1962, Ser. No. 214,417 2 Claims. (Cl. 266-38) This invention relates to 'an improved runner lfor handling molten metal and to a method of making the runner.

When molten metal is tapped from a furnace, such as an open hearth used in steelmaking, it ows down a runner into a suitable receiving vessel, usually a ladle. A conventional runner is `formed of a .metal shell which has a refractory lining, either of brickwork, monolithic or a combination. In service the refractory at the discharge end or nose of the runner wears rapidly. Such wear may cause permanent `damage to the liner and shell, which desirably have a longer life than the nose An object of my invention is to provide an improved runner which requires less maintenance than conventional runners, and the nose of which is more easily replaced.

A further object is to provide an improved runner which has a temporary or false nose of patching material over the permanent refractory lining and in which only the false nose requires frequent replacement.

A further object is to provide an improved method of making a runner which has the `foregoing characteristics.

In the drawing:

FIGURE 1 is an end elevational view of a runner shell constructed in accordance with my invention before the refractory is installed;

FIGURE 2 is a longitudinal section of the nose portion of the runner on line II--II yof FIGURE 1 with the refractory installed; and

FIGURE 3 is `a view similar of FIGURE 2, but showing how I can install a temporary nose even after the supporting clips burn off.

FIGURES l and 2 show la runner shell which includes a bottom wall 10, side walls 12, side flanges 13 and a bottom flange 14. The side walls 12 are welded to the edges of Ithe bottom wall and slope upwardly therefrom. The side flanges 13 are welded to the end lfaces of the side walls 12 and project inwardly therefrom. The bottom flange 14 is Welded to the upper Iface of the bottom wall 1li and lies between the side walls 12 spaced inwardly from the end of the bottom lwall and from the side flanges 13. Conveniently both bottom `and side walls are of 1% inch thick steel plates, the side flanges of 1 by 4 inch steel bars, and the bottom flange of a 1172 by 3 inch steel bar. The shell contains a refractory lining which is formed of a permanent monolithic layer 15 and a semipermanent bottom layer 16 overlying the monolithic layer, except at its discharge end or nose.7 The monolithic layer 15 covers the inside of the bottom plate 10, the bottom fiange 14, and the side plates 12 and preferably is of rammed magnesite. The bottom layer 16 can be of magnesite or dolomite of the type used in the bottom of a basic open hearth furnace.

In `accordance with my invention, I weld steel clips 17 to the outer faces of the respective side flanges `13 adjacent their lower ends. I insert a metal retainer `1S between these clips and the faces of the side flanges. The retainer extends across the width of the runner and can be either an angle iron as illustrated or a flat bar. I build up a temporary refractory nose 19 in the space between the retainer 13 and the end of the permanent layer 15, form- 3,174,739 Patented Mar. 23, 1955 ing a continuation of the bottom layer 16. This nose extends outwardly beyond the bottom plate 10 and bottorn flange 14. The nose can be of a refractory commonly known as patchingj which is a mixture of fire clay, crushed firebrick, and black pitch, with a small amountof water to form a mortar. After the nose refractory is laid, I dry it before using the runner. Conveniently I can install lthe runner on a furnace and dry the nose with a burner placed in the runner. The nose can be covered with sheet metal during the drying operation. As the runner is used to tap a heat of steel from an open hearth furnace, the nose is eroded but protects the permanent lining 15. After each use, I clean out and replace the nose refractory and retainer, but I can use the semipermanent bottom 16 several times without replacement, and I replace the permanent lining 15 only occasionally as bad spots develop.

As the runner is used, clips 17 may burn olf. Thereafter I can replace the nose additional times by inserting one leg of the retainer y18 in the space between the side lianges -13 and `bottom iiange 14, as shown in FIGURE 3. Otherwise I follow the same procedure as I have alreadly described.

From the foregoing description it is seen that my invention affords a simple and .practical runner construction, and minimizes the quantity of refractory which must be replaced as the runner is used. Since the nose projects beyond the bottom fiange and wall, the Whisker which forms as molten metal discharges does not weld to the metal shell of the runner. Instead the Whisker welds to the retainer 1S or merely hangs yfrom the nose, Where it can be removed easily without damaging permanent parts of the runner.

While I have shown Iand described only a single embodiment of my invention, it is apparent that modifications may arise. Therefore, I do not wish to be limited to the disclosure set forth but only by the scope of the appended claims.

I claim:

1. In a runner which includes a metal shell and a refractory lining, said shell being formed of a bottom plate, side plates sloping upwardly from said bottom plate, side flanges fixed to the ends of said side plates, and a bottom flange fixed to said bottom wall and lying between said side walls and spaced inwardly from the end of said bottom wall and from said side anges, said lining being formed of a permanent monolithic layer covering the inside of said bottom plate, said bottom flange and said side plates, and a semipermanent bottom layer overlying said monolithic layer, the combination therewith of a ternporary nose at the discharge end comprising clips fixed to the outside faces of the respective side lianges, a metal retainer supported by said clips and extending between said side flanges, and a body of replaceable refractory built up in the space between said retainer and said monolithic layer and forming a continuation of said bottom layer and extending beyond said shell.

2. A combination as defined in claim 1 in which said retainer is an angle iron, said bottom flange and said side flanges supporting said `angle iron in the space therebetween when said clips burn off.

Marshall Aug. 10, 1915 William et al. Apr. 19, 1927

Claims

1. IN A RUNNER WHICH INCLUDES A METAL SHELL AND A REFRACTORY LINING, SAID SHELL BEING FORMED OF A BOTTOM PLATE, SIDE PLATES SLOPING UPWARDLY FROM SAID BOTTOM PLATE, SIDE FLANGES FIXED TO THE ENDS OF SAID SIDE PLATES, AND A BOTTOM FLANGE FIXED TO SAID BOTTOM WALL AND LYING BETWEEN SAID SIDE WALLS AND SPACED INWARDLY FROM THE END OF SAID BOTTOM WALL AND FROM SAID SIDE FLANGES, SAID LINING BEING FORMED OF A PERMANENT MONOLITHIC LAYER COVERING THE INSIDE OF SAID BOTTOM PLATE, SAID BOTTOM FLANGE AND SAID SIDE PLATES, AND A SEMIPERMANENT BOTTOM LAYER OVERLYING SAID MONOLITHIC LAYER, THE COMBINATION THEREWITH OF A TEMPORARY NOSE AT THE DISCHARGE END COMPRISING CLIPS FIXED TO THE OUTSIDE FACES OF THE RESPECTIVE SIDE FLANGES, A METAL RETAINER SUPPORTED BY SAID CLIPS AND EXTENDING BETWEEN SAID SIDE FLANGES, AND A BODY OF REPLACEABLE REFRACTORY BUILT UP IN THE SPACE BETWEEN SAID RETAINER AND SAID MONOLITHIC LAYER AND FORMING A CONTINUATION OF SAID BOTTOM LAYER AND EXTENDING BEYOND SAID SHELL.