JPS58217612A - Method of repairing refractory material at wall of blast furnace - Google Patents

Abstract

PURPOSE:To repair a refractory material at the lower stage of the wall of a blast furnace in a short time, by providing a plurality of manholes at the body of the blast furnace, inserting a nozzle through the lower-stage manhole to perform spray repairing, and then repairing said lower-stage manhole using the upper stage manhole. CONSTITUTION:A plurality of manholes 6 for inserting nozzles for spraying a refractory material through them are provided at the body 1 of a blast furnace along its lengthwise. They are filled with a refractory material and blocked up with blank caps during ordinary operation. In repairing the wall 2 of the furnace, the manhole 6 is opened, a nozzle 7 for spraying a refractory material is inserted through it, and an amorphous refractory material 10 is sprayed to repair the wall 2 of the furnace. Thereafter, the nozzle 7 is taken out, and a partition iron plate, a refractory material and a blank patch are attached to the manhole 6. Another nozzle 8 is then inserted through an upper-stage manhole 9, and an amorphous refractory material 10 is sprayed onto the inner side of said manhole 6 used for the repairing work to repair the part of the manhole 6. By this method, the cost of repairing can be reduced, and the life of the blast furnace can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing furnace wall reinforcements that are worn out during the operation of an ironmaking blast furnace.

The refractories on the inner surface of the blast furnace wall are worn out during blast furnace operation, so it is necessary to repair the refractories during wind downtime to extend the life of the blast furnace. The repair method involved, for example, inserting a refractory spray nozzle into an armored manhole or the like, and spraying monolithic refractories onto the furnace wall around the blast furnace mouth. However, with this method, the repair range of refractory spraying is limited to the area around the blast furnace mouth, and the furnace wall at the bottom of the shaft cannot be repaired.

Another method for spraying refractories from the furnace mouth is assembling and charging specialized equipment, and repairing large refractories on the furnace wall while rotating it in the furnace, but in this case, equipment costs are high. This has disadvantages in that it takes a long time to assemble the equipment and requires some experience in operating the equipment.

The present invention solves the above-mentioned drawbacks and provides a method for repairing blast furnace walls by repairing them easily and inexpensively in a short period of time.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for repairing a large carp wall in a blast furnace according to the present invention will be described based on the drawings.

Figure 1 is a side sectional view of the blast furnace.
l/ ) l at the required intervals in the height direction and circumferential direction,
In advance or after firing the blast furnace, prepare a plurality of nozzle charging manholes (Lt5) for spraying refractories. During normal operation of the blast furnace, this manhole/L/6 is closed by filling the inside with refractory 15 and tightening the blind cover 14 with bolts and nuts 12 through packing 13 (as shown in Fig. 2). 11 is a mantel reinforcing material provided around the manhole 6.

Note that 3 in the figure is a Nutape embedded in the refractory for cooling the blast furnace wall 2.

When repairing the fireproofing and unevenly damaged parts of the furnace wall 2 using the blast furnace downtime, remove the blind cover 14 and refractory 15 of the manhole 6 near the repaired part, open it, and For material spraying, the nozzle 7 is inserted as shown in FIG. When the repair is completed, pull out the nozzle/I/7 and repair the 6th part of the manhole that was opened and used during the above repair.In this case, the 4th
As shown in the figure, there is a partition iron plate 1 inside the manhole/1/6 hardware.
6, the refractory 15 is filled, and the blind lid 14 is attached. Next, for spraying refractories from a manhole above the manhole 6 to be repaired, insert the nozzle 8 as shown in the broken line in Figure 1, and use the opening for spraying the furnace wall before the tip of the nozzle 8. A monolithic refractory material 10 is sprayed inside the furnace of the manhole 6, and the opening is filled and repaired. In Fig. 1, the refractory spraying in this case is performed by connecting the nozzle V8 to the armored manhole installed near the bottom of I15 at the top of the furnace.
Although charging from I/9 is shown, charging with this nozzle 8 is not limited to armor manhole 9, and the manhole 6 to be repaired, which was previously used to repair the furnace wall, is shown. It is possible to use a manhole 6 located at an appropriate position located higher up.

As is clear from the above description, the method for repairing large blast furnace wall refractories according to the present invention requires a required interval in the height direction and circumferential direction of the blast furnace body when repairing a damaged portion of the blast furnace wall refractories. When spraying multiple refractories in advance or after blast furnace firing, use the nozzle charging manhole) v6.・－・、6
For spraying refractories from the lower manhole 6 near the repaired area, insert the nozzle L/7 and perform the spraying for repairs. The spraying is performed by inserting the nozzle 8 and first repairing the manhole part (this method is characterized by repairing the manhole part, which was previously considered impossible). It is now possible to repair the furnace wall at the bottom of the shaft.

In addition, the above manholes can be repeatedly used for repair work (II), which can greatly reduce repair costs and extend the life of the blast furnace, making it extremely effective. It's an h thing.

[Brief explanation of drawings]

The drawings show an embodiment of the method for repairing blast furnace wall refractories according to the present invention, and FIG. 1 is a vertical cross-sectional view, and FIG. 2 is a vertical cross-sectional view of a manhole for spraying refractories into a nozzle. ,
FIG. 3 is a vertical sectional view showing a state in which a nozzle is inserted for spraying refractory material from the manhole, and FIG. 4 is a vertical sectional view showing the state of the manhole when it was repaired and repaired. 1 Blast furnace body (mante/I/) 2 Furnace wall 6 Manhole 7.8 Nozzle 15 Refractory patent applicant Nisshin Steel Co., Ltd.

Claims (1)

[Claims] For spraying multiple refractories, manholes are provided at required intervals in the height direction and circumferential direction of the blast furnace body, either in advance or after the blast furnace has been heated. The method is characterized in that the spraying is carried out to repair by charging the manhole, and then a nozzle is inserted to spray the refractory from a manhole above the manhole, and the spraying is carried out to repair the part of the manhole that was previously used for the repair. Method for repairing blast furnace wall refractories.