JPS61257406A - Device for repairing inside wall of blast furnace - Google Patents

Abstract

PURPOSE:To repair the damaged part of the refractories in a blast furnace with good workability, stably, by spraying castable refractories from spray nozzles attached freely liftable via a nozzle lifting device to the body of a repairing device detained to the top end of a swiveling chute. CONSTITUTION:The body 22 of the repairing device is fixed and detained, by means of a hook 24 for attaching, to a stiffener 18 for preventing the deformation of the swiveling chute 8A through a manhole 38 is the top part of a bell-less blast furnace. The spray nozzles 28 are further freely liftably attached via the nozzle lifting device 26 to the body 22 and a water hose 32, castable refractory hose 34 and hose 36 for driving the nozzle lifting device, etc., inserted through a vertical chute 30 into the furnace are connected thereto to constitute the device fore repairing the inside wall. The castable refractories are sprayed together with water from the above-mentioned nozzles 28 and at the same time the chute 8A is adequately swiveled and changed in angle by a driving device 20 and the nozzles 28 are moved upward and downward, by which the damaged part 16 of the inside wall refractories 14 is stably and exactly repaired.

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 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 of the inner wall refractories at the upper part of the furnace shaft has become apparent, and irregular wear and tear on the inner wall disturbs the gas flow in 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 damaged 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, as shown in Fig. 5. Its configuration was shown. That is, the spraying device 4 is suspended from the center of the furnace by the wire 2, and the weight 6 of the spraying device 4 is pressed against the rotating chute 8 by the weight 10.
The refractory is sprayed from the spray nozzle 12 onto the damaged portion 16 of the inner wall refractory 14 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 in that it cannot be used with a rotating chute 8 that is provided with a stiffener to prevent deformation or whose inner surface 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 apparatus for repairing an inner wall of a blast furnace having a rotating chute provided with a stiffener for preventing deformation and having excellent workability.

[Means and operations for solving the 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 stiffener for preventing deformation, 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. As shown in FIG. 1, in the upper part of the blast furnace, there is provided a swinging chute 8A equipped with a stiffener 18 for preventing deformation, and the swinging and chute inclination can be changed by a drive device 20.

The repair device main body 22 is mounted on a rotating shoe ~1 as shown in Fig. 3.4.
-8 Stiffener for preventing deformation attached to the tip of A.
18 is fixed and secured by a 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 elevating device 26 or when a large spraying capacity is required, a plurality of spray nozzles 28 are installed, shifted downward by two degrees. 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 driving boss 36 are attached via a 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. Stiffener 18 for preventing deformation of
Then, the hoses are inserted into the furnace through the vertical chute 30 and connected.

After the above preparatory 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,
Since the spray nozzle 28 is given the swing necessary for spraying, the spray nozzle 28 can accurately and stably target the damaged portion 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 rotating shoe 8A.

To spray the monolithic refractory, the monolithic refractory is fed under pressure from the monolithic refractory supply hose 34 with compressed air, and then the monolithic refractory is fed through the water supply hose 32
The water is sent to the spray nozzle 28, where the two are thoroughly mixed and sprayed onto the damaged area 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 4 in the repair device main body that can be raised and lowered via a nozzle lifting device to accurately and appropriately apply the spray to the damaged area. By carrying out such repairs, 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 drawings]

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. A plan view showing how the device is locked to the rotating chute, Figure 4 is a side view of Figure 3, and Figure 5 is a side view of Figure 3.
The figure is a sectional view of a conventional furnace wall repair device. 8.8A...Swivel chute 14...Inner wall refractory 1
6... Damaged part 18... Stiffener for preventing deformation 22 - Repair device main body 26 - Nozzle lifting device 2
8. Spray 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, and a nozzle lifting device installed in the repair device main body;
A blast furnace inner wall repair device comprising: a spray nozzle for monolithic refractories that is attached to the lifting device main body via a nozzle lifting device so as to be able to rise and fall freely.