JPS583036Y2 - Fireproof mortar press-fit nozzle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a refractory mortar press-in nozzle that is inserted into a furnace and press-fits refractory mortar into the worn part in order to cope with local wear and the like of the lining bricks of a blast furnace or the like.

The lining bricks of blast furnaces etc. are subject to severe wear and tear due to reactions with the furnace contents at high temperatures or contact with hot metal.
A highly viscous refractory mortar of 50% or less is injected into the worn parts of the lining bricks using a press-fit nozzle to form a protective furnace wall on the inner surface of the steel shell, or the lining bricks are repaired.

At this time, conventionally, the nozzles shown in Figures 1, 2, and 3 have been used as refractory mortar press-in nozzles, but when injecting highly viscous refractory mortar into the inner wall of the furnace, these nozzles are used. Both have drawbacks.

That is, the refractory mortar press-fitting nozzle 1 shown in FIG. Although it is fixed, since it is a straight tube, most of the refractory mortar press-fitted into the furnace from the press-in nozzle 1 is discharged into the furnace and cannot be filled into the inner surface of the iron skin.

Furthermore, the refractory mortar press-fit nozzle 5 shown in FIG. 2, which is fixed to the steel shell 3 in the same manner as the press-fit nozzle 1 shown in FIG. 6 are provided so that the refractory mortar is discharged from each side hole 6 toward the inner wall of the furnace, but this is suitable when the refractory mortar has a low viscosity and is made into a slurry and is forced into the furnace using a pump. Therefore, when press-fitting highly viscous refractory mortar, the pressure loss resistance is large, making press-fitting difficult.

In addition, the refractory mortar nozzle γ shown in FIG. 3, which is similarly fixed to the steel shell 3, has an umbrella-shaped pad 9 attached to its tip via a support rod 8, and this pad 9 directs the refractory mortar toward the inner wall of the furnace. Similar to the press-fit nozzle 5 shown in Fig. 2, this is also suitable for press-fitting refractory mortar in the form of a low-viscosity slurry; When press-fitting, the refractory mortar extruded from the front edge of the nozzle is compressed into the umbrella-shaped pad 9,
Unlike low-viscosity slurry refractories, it is not discharged toward the inner wall of the furnace.

In other words, pressure loss resistance is large and press-fitting is difficult.

The present invention was developed to eliminate the drawbacks described above, and allows highly viscous refractory mortar to be smoothly press-fitted into the furnace without pressure loss resistance, and to adhere to the inside of the blast furnace shell with a high packing density. The aim is to provide a refractory mortar press-fit nozzle that can be used.

Hereinafter, an explanation will be given based on FIGS. 4 and 5 showing examples thereof.

In the figure, 10 is a refractory mortar press-fit nozzle inserted into a wall thickness measuring hole 11 opened at a predetermined position of the steel shell 3, and the flange 12 fixed in one direction is joined to the flange 4 fixed to the steel shell 3. It is fixed and fixed to the iron skin 3.

Note that the refractory mortar press-fit nozzle 10 usually has a diameter of 30 to 100.
A steel pipe with a diameter of mm is used in accordance with the wall thickness measurement hole 11 that is pre-opened in the steel shell 3, and in the part where there is no wall thickness measurement hole 11, an insertion hole with a hole diameter larger than the refractory mortar press-fit nozzle 10 is inserted. is used by drilling it into the iron shell 3.

Moreover, the refractory mortar press-fit nozzle 10 is inserted and mounted so that its tip edge protrudes 10 to 30 meters from the inner wall surface of the furnace.

Reference numeral 13 denotes a stopper which has a protrusion 14 at the center of the rear end surface and extends from the protrusion 14 to the periphery to form a parabolic concave curved surface. It is supported and fixed at a position slightly apart from the tip edge of the press-fit nozzle 10, and constitutes a refractory mortar discharge port 16.

The outer diameter of the pad 13 is made the same as that of the press-fit nozzle 10, so that the press-fit nozzle 10 can be inserted into the wall thickness measurement hole 11 from the outside of the steel shell 3 without any problem.

In the embodiment shown in FIG. 4, the tip of the protrusion 14 provided at the center of the rear end surface of the stopper 13 protrudes from its periphery, and in the embodiment shown in FIG. It is lower than the section.

Reference numeral 17 denotes a lining brick installed around the inner surface of the steel shell, and FIG. 4 shows a case where a part of it has worn down to the inner surface of the steel shell 3, and FIG. 5 shows the inner surface of the lining brick 17. This shows a case where a part of the

The refractory mortar press-fitting nozzle 10 of the present invention having the above-described configuration has a pad 13 having a parabolic concave curved surface supported and fixed at the tip opening of the press-fitting nozzle 10, and a contact between the opening of the press-fitting nozzle 10 and the pad 13. A refractory mortar discharge port 16 is formed between the concave curved surfaces of the refractory mortar.

The discharge port 16 has an area ratio of at least 0.5:l to 1:l with respect to the cross-sectional area of the press-in nozzle 10 so that highly viscous refractory mortar can be reversely discharged without pressure loss.
ensure within the range of

This is because when the area ratio is less than 0.521, the pressure loss becomes so large that press fitting becomes impossible, and conversely, l:
This is because if the value is 1 or more, the refractory mortar will not be reversed toward the inner wall of the furnace but will be discharged in a direction parallel to the front edge cross section of the press-fit nozzle 10.

When highly viscous refractory mortar is pumped by a hydraulic pump (not shown), the refractory mortar is guided by the concave curved surface of the pad 13, and the refractory mortar is smoothly delivered to the discharge port 16 without increasing internal resistance. It is discharged towards the inner wall of the furnace.

Therefore, if the lining bricks 17 are worn down to the inner surface of the steel shell 3, as shown in FIG. Form.

Further, if a part of the inner surface of the lining brick 17 is worn out as shown in FIG. 5, refractory mortar is applied to the worn part to repair the lining brick.

At this time, if the protrusion 14 of the gold 13 protrudes from its peripheral edge as shown in FIG. When the protrusion 14 of the pad 13 is inserted into its periphery as shown in FIG. 5, the refractory mortar is discharged and adhered to the inner wall surface of the furnace in a relatively narrow area as shown by the arrow B.

Therefore, depending on the degree of wear and tear on the inner wall of the furnace, the refractory mortar press-fit nozzle 10 is fixed with a pad 13 having a different concave curved surface at the rear end.
You can select and use.

The refractory mortar press-in nozzle of the present invention can be used not only in blast furnaces, but also in hot blast furnaces, heating furnaces, etc., when press-fitting refractory materials for the same purpose.

As explained above based on the embodiments, the refractory mortar press-fit nozzle of the present invention is an improvement on the conventional refractory mortar press-fit nozzle, and a protrusion is provided at the center of the rear end surface, and a parabolic concave curved surface is formed from the tip of the protrusion to the periphery. By installing a metal fitting at the tip of the press-fit nozzle so that the area of the discharge opening to be formed between the two is within a predetermined range, pressure drop resistance is reduced and highly viscous refractory mortar can be smoothly formed. can be press-fitted toward the inner wall of the furnace, thus forming a high-density protective wall on the inner surface of the steel shell, and completely repairing the damaged part of the lining brick.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are cross-sectional views of conventional refractory mortar press-fitting nozzles attached to the furnace wall, and Figures 4 and 5 are enlarged cross-sectional views showing embodiments of the refractory mortar press-fitting nozzles of the present invention. be. 3 is an iron shell, 10 is a press-fit nozzle, 13 is a stopper, 14 is a protrusion, and 15 is a support rod.

Claims (1)

[Scope of utility model registration request] A protrusion is provided at the center of the rear end surface, and an appropriate number of pads are inserted into the furnace wall from outside the furnace toward the inside of the furnace. The area of the discharge port opened between the two through the support rod is within the range of 0.5:1 to 1:1 with respect to the cross-sectional area of the press-fit nozzle, and the discharge port is supplied into the press-fit nozzle. A refractory mortar press-in nozzle, characterized in that the refractory mortar is guided in reverse by the parabolic concave curved surface of the pad, and is discharged from the discharge port toward the inner wall of the furnace.