JPH0585831B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is particularly applicable to converters, electric furnaces, other smelting furnaces, industrial equipment for incineration and high-temperature reactions, and high-temperature industrial equipment including auxiliary equipment such as flues. The present invention relates to a method for preventing the lining from falling off, which is suitable for use in assembling and repairing refractory linings for high-temperature equipment.

[Conventional technology]

When constructing or repairing the refractory lining of the high-temperature equipment, shaped or unshaped refractories and sometimes the hardware that supports them may fall off. Various methods have been adopted to actively prevent this.

The most commonly used prevention measures are to erect scaffolding in an appropriate location, make a frame of metal or wood, and use a device in which the frame is stretched with fibrous or metal netting, or A push plate is made of wood or metal plate, and the push plate is pressed against the fireproof lining using a wooden frame.

This conventional method will be explained with reference to FIG. 9, taking as an example a method for repairing the bottom lining of a converter. Refractory bricks 4 for repair are suspended in advance into the furnace 1a of the converter 1 by the crane 3, and then the crane 3 connects the nets 6 to the wires 7 through the support beams 5.
and lift it up until it comes into close contact with the shoulder portion 10 of the converter 1. Next, workers 8 and 9 descend to the bottom of the hearth using a gondola (not shown) and perform repair work using the refractory bricks 4.

In this method, until the net 6 is assembled and tightly attached, workers involved in unloading the cargo inside the furnace are placed in a defenseless situation. In addition, the refractory bricks on the shoulder portion 10 of the converter may fall, and the weight of the refractory bricks may reach 20 to 30 kg (unit weight).
The structure of the net 6 must also be strong, which is costly, and furthermore, it requires a great deal of labor to stretch the net. Moreover, there are problems in that it requires a great deal of labor and cost and is not necessarily advantageous in terms of safety. In particular, such problems are common in equipment with refractory linings, such as converters.

As a device for preventing the occurrence of the above problem,
The inventor of the present application disclosed a fireproof lining fall prevention device in Utility Model Application No. 75074/1983.

As schematically shown in FIG. 10, this device is constructed by closely connecting cylindrical balloon bodies 11a to 11j, which are ring-shaped flexible tubes that can be expanded and deflated.
A balloon body 11 is formed, to which an exhaust pipe 15 and a check valve 16 for switching between air supply and exhaust are attached. When working, this balloon body 1
1 is inserted into the converter 1 from above in the contracted state, and compressed gas is supplied from the air supply pipe 14 equipped with the check valve 16 to expand the flexible tubes 1a to 11j, and the flexible tubes 1a to 11j are expanded. Press it against the inner wall 1b. At this time, in order to prevent mechanical damage to the flexible tubes 11a to 11j, a protective screen 12 consisting of unit protective screens 12a to 12c is interposed between the flexible tube 11 and the converter inner wall 1b. The flexible tube 11 and the protective curtain 12 are supported by a support beam 17 extending across the opening of the converter 1 and suspended in the furnace.

As a result, the pressing force exerted by the flexible tube 11 is effective to prevent the furnace wall bricks from falling off, while allowing the worker to descend into the furnace along the ladder 13 and safely perform work inside the furnace. .

[Problem that the invention seeks to solve]

However, this means that the flexible tube 11
It is difficult to take things in and out of the furnace, and it requires considerable effort and effort to bring in and out repair materials and equipment into the furnace.

The present invention ensures work efficiency and safety when constructing or repairing refractory linings of high-temperature equipment such as the above-mentioned converter, and also enables effective removal of the refractory linings at minimal cost. This provides a highly reliable method to prevent this.

[Means for solving problems]

In the present invention, an expandable and contractible annular balloon formed by connecting an arbitrary number of cylindrical balloons in parallel is inserted into the high-temperature device in a contracted state, and then a pressure medium is supplied to the annular balloon to expand it. The refractory lining is pressed against the lining surface to prevent the refractory lining from falling off.

Below, Figures 1A and 1C show an example in which the method of the present invention is applied to partial repair of a refractory lining of an upright reactor.
This will be explained with reference to FIG. 2b and FIGS. 2a and 2b.

FIG. 1 is a partial cross-sectional view of the upright reactor, and FIG. 2 is a view of FIG. 1 taken along lines aa and bb. In these figures, the annular balloon body is shown as 22 and is made of a plurality of expandable and contractible elastic materials, such as synthetic rubber or other polymeric materials, reinforced with fibers or cloth as necessary. The cylindrical balloon bodies 22a are connected in parallel to form an annular body.

FIG. 3 is a diagram showing an example of the connected state.
In the figure, the aforementioned cylindrical balloon bodies 22a, 22
b, 22c are soft membrane-like bodies 26a such as synthetic rubber or other polymeric materials, or organic or inorganic fabrics;
~26d, and are connected by appropriate adhesive means such as adhesive or screwing. Reference numeral 23 indicates an air supply pipe for opening the valve 24 and supplying compressed gas to the annular balloon body 22. Further, 27a to 27d are air supply and exhaust communication pipes to each of the cylindrical balloon body units 22a to 22c. The annular balloon body 22 having such a structure is a soft membrane-like body 26.
If a to 26d are made trapezoidal to form an annular balloon body, the shape when inflated can be made into an umbrella shape or a parachute shape.

As described above, the annular balloon body used in the present invention can be formed into an egg-shaped, football-shaped, or It can be adapted to the shape of the internal refractory lining of various high-temperature devices, such as spherical or gourd-shaped, and can be prevented from falling off even if it is pressed against the lining of any part of any shape.

Figure 4 shows cylindrical balloon bodies 2 with different cross-sectional shapes.
In this cross-sectional view showing a connected state of 2f to 22k, each of the cylindrical balloon bodies 22f to 22k is widely bonded to an outer wall 28.

FIG. 5 shows an example of another connected state, in which a common wall 28a is provided for the cylindrical balloon bodies 22l to 22o with square cross sections, and a ventilation hole 29, for example, is provided in the wall 28a.

FIG. 6 shows still another embodiment, in which the cylindrical balloon bodies 22p and 22q are connected in parallel via a rod-like connecting body 30.

In this way, the annular balloon body 22 with various shapes
is suspended from the top opening of the reactor 20 in a contracted state by a wire 21 using a crane (not shown) from the top opening of the reactor 20 to the damaged part of the lower part of the inner refractory lining 18 of the steel shell 19 shown in FIG. 1a. Then, the valve 24 provided in the air supply pipe 23 is opened to supply compressed gas to the annular balloon body 22 . Due to this air supply, the annular balloon body 22 expands as shown in FIG.
8 and prevents the refractory lining 18 from falling off.

In carrying out the present invention, it goes without saying that the protective curtain 12 used in the conventional method can also be optionally used.

Further, details of the annular balloon body 22 that can be suitably used for repairing a converter will be explained with reference to FIGS. 7a and 7b.

In FIG. 7a, an upper annular balloon body 22z consisting of a cylindrical balloon body 22p and a lower annular balloon body 22y consisting of a cylindrical balloon body 22r are connected by a detachable carabiner 31b and used as an integrated body. 3
Reference numeral 2 denotes a support ring, 33 a ring for suspending an in/out wire, and 34 a ring for suspending the annular balloon body 22 as an integral body. 35a, 35b are fasteners of the upper and lower annular balloon bodies 22z, 22y, and the connecting body of the cylindrical balloon bodies 22p, 22r is in the form of a band,
By binding the cylindrical balloon bodies at both ends with the fasteners 35a and 35b, integrated annular balloon bodies 22z and 22y are formed. 36a, 36
Reference numeral b designates a compressed gas communication pipe, and the cylindrical balloon bodies, which are unit structures of the upper and lower annular balloon bodies 22z and 22y, are connected through a communication hole (not shown) so that they can freely supply and exhaust air to each other.

Further, the supply/exhaust hoses 37a, 37b are connected to supply/exhaust blowers 38a, 38b. Therefore, by operating the supply/exhaust blowers 38a, 38b, the annular balloon bodies 22z, 22y can be expanded and deflated to change their shape.

FIG. 7b is a view taken along line BB in FIG. 7a, and the symbols of each part correspond to those in FIG. 7a. In this example, 8 blocks are stitched together to form an annular balloon body 22.
39 is a wire for carrying in and out of each block.

〔Example〕

A process for repairing the refractory lining of a 300-ton converter using the annular balloon body shown in FIG. 7 will be explained with reference to FIGS. 8 a to 8 f. The weight of the annular balloon body is 200~400Kg
The internal pressure was 0.3 to 0.5 Kg/cm ² and the length was 2800 to 3900 mm. The shape when expanded was as shown in Figure 7a, with an upper diameter of 4000 to 4500 mm and a lower diameter of 6900 to 7800 mm.

FIG. 8a is a schematic diagram showing the charging state of the annular balloon body 22 in a converter, in which the annular balloon body 22 is inserted into the converter by a wire 39 and a crane after passing through an upper frame 41 having an opening in the center. hang it up and take it down.

Therefore, in this example, illustration of permanent bricks is omitted for convenience of explanation.

Then, as shown in FIG. 8b, the air pump 4
0, compressed air is sent from the supply/exhaust hose 37c to press the annular balloon body 22 into close contact with the shoulder portion 10 in the converter where permanent bricks tend to fall.

Further, as shown in FIG. 8c, after the wire 39 is removed and the annular balloon body 22 is suspended by the holding wire 45, the relining device 42 is inserted into the converter, and then the workbench 43 is Above, the worker 44 lays refractory bricks for the hearth bottom refractory lining 18b and side wall linings 18c (wear bricks).

As shown in FIG. 8d, when the refractory brickwork reaches the shoulder, the lower half of the annular balloon body 22, that is, the annular balloon body 22y in FIG. 7a, is dismantled and carried out of the converter 1 by a crane.

Thereafter, as shown in FIG. 8e, when the refractory brickwork has progressed to the top of the converter 1, the upper half of the annular balloon body 22, that is, the annular balloon body 22z, is deflated and reduced in size, and the converter 1 is removed by a crane. Carry it outside.

FIG. 8f shows the state in which the relining device 42 has been disassembled after the construction of the fireproof lining has been completed.

[Effects of the Invention] The method of the present invention can expand and contract freely, can be charged into the furnace even through a narrow mouth, has the function of adhering to the target refractory lining wall and preventing it from falling off, and is easy to disassemble and It uses an annular balloon body that can be carried in and out freely, and is highly reliable in terms of safety.

[Brief explanation of the drawing]

FIGS. 1 and 2 are diagrams showing an overview of the method of the present invention, and FIGS. 3 to 6 show the bonding mode for forming the annular balloon body used in the present invention. 7th
The figure shows details of the annular balloon body, and FIG. 8 is a diagram showing a specific embodiment of the present invention. FIG. 9 and FIG. 10 are explanatory diagrams of the conventional method. 1... Converter, 11... Balloon body, 22... Annular balloon body.

Claims (1)

[Claims] 1. An arbitrary number of cylindrical balloons are connected in parallel to form an expandable and contractible annular balloon, the annular balloon is contracted and inserted into the high-temperature device through the opening of the high-temperature device, and then pressure medium is introduced into the high-temperature device into the annular shape. A method for preventing a lining from falling off of a high-temperature device, comprising feeding the balloon body to expand it, and pressing the outer surface of the annular balloon body against the lining surface of the high-temperature device.