JPH0564204B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an inner wall repair device for a blast furnace, and particularly relates to an inner wall repair device that can perform accurate repair, and is used for repairing the inner wall of a blast furnace during operation.

[Conventional technology]

In recent years, due to changes in the operating conditions of blast furnaces, wear and tear on the inner wall refractories at the upper part of the furnace shaft has become apparent, and irregular wear and tear on the inner walls disturbs the gas flow within the furnace, leading to instability in the furnace condition. Furthermore, when the inner wall refractories wear out, the heat load on the furnace shell increases, which shortens the life of the furnace.

For this reason, repair work has conventionally been carried out by spraying refractory material onto the worn parts of the refractories on the inner walls of blast furnaces during operation.

For example, Japanese Patent Publication No. 58-49606 discloses a repair device using a rotating chute, but this has a configuration in which a spraying device is suspended from the center of the furnace and pressed against the rotating chute by a weight, and its configuration is shown in Fig. 5. showed that. That is, the spray device 4 is suspended from the center of the furnace by the wire 2, and the sled 6 of the spray device 4 is pressed against the rotating chute 8 with a weight 10, and the spray nozzle 12
Then, the damaged part 16 of the inner wall refractory 14 is sprayed with refractory to repair it. This device requires a holding mechanism for the spraying device such as a pulley or wire 2 in the reactor core, and the spraying device moves when turning and comes loose from the repaired area, resulting in poor stability and poor workability. Furthermore, since the spray device slides along the rotating chute 8, there is a problem that it cannot be used in a rotating chute 8 where a stiffener for preventing deformation is installed or where the inner surface of the chute is not flat.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide an inner wall repair device with excellent workability in a blast furnace having a rotating chute provided with a stiffener for preventing deformation.

[Means and actions for solving problems]

The gist of the present invention is as follows.
That is, a repair device main body is fixed to the tip of a rotating chute for charging raw materials of a bellless blast furnace via a deformation prevention stiffener, a nozzle lifting device installed in the repair device main body, and a nozzle lifting device installed in the lifting device main body. An apparatus for repairing the inner wall of a blast furnace, comprising: a spray nozzle of monolithic refractory material attached to the apparatus so as to be able to rise and fall freely.

The details of the present invention will be explained with reference to the embodiments illustrated in FIGS. 1-4. At the top of the blast furnace, as shown in Fig. 1, there is a rotating chute 8 equipped with a stiffener 18 for preventing deformation.
A is provided, and a drive device 20 allows turning and changing the inclination of the chute.

As shown in FIGS. 3 and 4, the repair device main body 22 is secured to a deformation prevention stiffener 18 attached to the tip of the swing chute 8A by means of an attachment hook 24.

The repair device main body 22 is provided with a nozzle lifting device 26 and a spray nozzle 28, as shown in FIG. The spray nozzle 28 can be moved up and down by the action of the nozzle lifting device 26. When it is desired to limit the stroke length of the lifting device 26 or when a large spraying capacity is required, a plurality of spray nozzles 28 are installed vertically shifted. In FIG. 2, three spray nozzles 28 are shown. Further, a water supply hose 32, a monolithic refractory supply hose 34, and a nozzle lifting device drive hose 36 are attached via the vertical chute 30 of the reactor core.

To repair the inner wall, first, the repair device main body 22, spray nozzle 28, etc. are carried into the furnace through the manhole 38 using a rotating chute replacement device (not shown), and the rotating chute 8A is adjusted to an appropriate inclination angle for installation.
The mounting hook 24 is attached to the stiffener 18 for preventing deformation.
and then connect the hoses to the vertical chute 30.
Insert it into the furnace and connect it.

After the above preparation work, move the spraying device vertically and circumferentially by operating the swing chute 8A and the nozzle lifting device 26 toward the damaged part 16 of the inner wall refractory 14, and move the spraying device 2 necessary for spraying.
8, the spray nozzle 28 can accurately and stably target the damaged area 16.

The distance between the spray nozzle 28 and the inner wall refractory 14, which affects the adhesion of the sprayed monolithic refractory to the inner wall refractory 14, is adjusted by changing the inclination angle of the swing chute 8A.

In spraying the monolithic refractories, the monolithic refractories are fed under pressure from the monolithic refractory supply hose 34 with compressed air, water is fed through the water supply hose 32, and the two are sufficiently mixed to the spray nozzle 28 to prevent damage. Spray on part 16.

〔Effect of the invention〕

The present invention locks the repair device main body to the rotating chute via a stiffener for preventing deformation, and installs a spray nozzle that can be raised and lowered on the repair device main body via a nozzle lifting device to perform accurate and appropriate repairs on damaged parts. By doing so, it became possible to repair the inner wall with excellent efficiency and quality, making a major contribution to extending the life of the blast furnace and stabilizing the furnace condition.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the top of the blast furnace showing how the furnace wall repair device of the present invention is attached to the blast furnace, Fig. 2 is a front view of the furnace wall repair device of the present invention, and Fig. 3 is the furnace wall repair device of the present invention. FIG. 4 is a side view of FIG. 3, and FIG. 5 is a sectional view of a conventional furnace wall repair device. 8, 8A... Rotating chute, 14... Inner wall refractory, 16... Damaged portion, 18... Stiffener for preventing deformation, 22... Repair device main body, 26... Nozzle lifting device, 28... Spraying nozzle.

Claims (1)

[Claims] 1. A repair device main body that is locked to the tip of a rotating chute for charging raw materials of a bellless blast furnace via a deformation prevention stiffener, a nozzle lifting device installed in the repair device main body, and a nozzle lifting device installed in the lifting device main body. A blast furnace inner wall repair device comprising: a spray nozzle for a monolithic refractory material that is attached to the spray nozzle so as to be able to be raised and lowered through the blast furnace.