JPH0136076Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to the improvement of the furnace wall structure of various types of kilns, and in particular prevents the occurrence of local cracks and cracks in the refractory bricks and strengthens the interconnection of the refractory bricks. The present invention relates to a furnace wall with a collapse-preventing structure that extends the life of the furnace.

Conventional technology Conventionally, in various types of kilns such as blast furnaces, hot blast furnaces, heating furnaces, soaking furnaces, coal vitrification furnaces, copper reverberatory furnaces, incinerators, and tunnel kilns, efforts have been made to extend the life of refractory bricks that form the furnace walls and prevent them from collapsing. From this point of view, the use of refractory bricks with dowels and tension sections has become widespread. These refractory bricks with dowels and tension parts strengthen the connection between adjacent refractory bricks, prevent the refractory bricks from protruding or collapsing due to thermal expansion during operation, and extend the life of the furnace wall. As shown in Fig. 6, by arranging the required number of doweled refractory bricks 2 provided with uneven dowels 1, and fitting the uneven dowels 1, the connection between the refractory bricks 2 is strengthened, or as shown in Fig. 7. A tensile refractory brick 4 having a notch 3 is disposed as necessary, one end of which is fitted into the notch 3, and the other end of the tension fitting 5 is fixed to the steel shell 6, thereby allowing the refractory bricks 4 and 7 to close together. It is prevented from falling out or collapsing.

Problems that the invention attempts to solve However, in such a furnace wall structure,
The refractory bricks 2 with dowels and the tensile refractory bricks 4 have the effect of firmly connecting the refractory bricks 2 or 4, 7, but these refractory bricks 2, 4 are provided with uneven dowels 1 and cutouts 3, When the refractory bricks 2, 4, and 7 that form the furnace wall exhibit thermal expansion due to changes in the temperature inside the furnace during operation of the furnace, the thermal expansion stress concentrates on one uneven dowel or notch 3, causing local cracks and cracks. occurred, and the refractory bricks 2,
4 and 7 are restrained on the furnace shell side, and the thermal expansion stress in the furnace radial direction (inward direction) and furnace circumferential direction (horizontal direction) is accumulated toward the center of the furnace.
If the dowel or tensile function is lost, the refractory brick 2
Alternatively, 4 and 7 may be pulled toward the inside of the furnace, protrude, and fall off.

If refractory bricks 2, 4, and 7 fall off even in one place, the falling off will spread to the surrounding area starting from the first falling place, causing the furnace wall to collapse, but conventionally there is no means to prevent this ripple phenomenon. This improvement was much desired.

Means for Solving the Problems The present invention was made with the aim of solving the above-mentioned problems of the prior art. By arranging a net-like metal member and fixing the outer end of the furnace, local cracks and cracks in the refractory bricks can be prevented, the connection between the refractory bricks can be strengthened, and the life of the furnace can be extended. The object of the present invention is to provide a furnace wall having a collapse-preventing structure having the structure described in the patent claims.

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS. 1 to 5, and parts common to those in FIGS. 6 and 7 are denoted by the same reference numerals.

The furnace wall collapse prevention structure according to the present invention is shown in FIG. 1, which shows a partial vertical side view of a furnace with a flat furnace wall and no shell shell, and FIG. 2, which shows a partial cross section taken along arrow A-A in FIG. Third
As shown in the figure, which shows a partial vertical side view of a kiln having a furnace shell, a mesh metal member 9 is disposed at the horizontal joint 8 between the refractory bricks 7 forming the furnace wall. A protrusion 10 is provided at the outer end of the furnace,
This protrusion 10 is fixed to a backstay 11 (see FIGS. 1 and 2) or an iron skin 6 (see FIG. 3), and the two are constructed by combining them 7 and 9.

The mesh metal member 9 is made of conventional doweled refractory bricks 2 (see FIG. 6) and tensile refractory bricks 4.
(See Figure 7).In order to strengthen the connection between adjacent refractory bricks 7 and ensure tensile strength, the width dimension is the same as the furnace wall thickness dimension of the refractory bricks 7, and the length dimension is The size is slightly smaller than the size of 4 to 5 refractory bricks 7 arranged in parallel in the horizontal direction, and it is formed so that a plurality of refractory bricks 7 can be connected at once, and a backstay 11 or A protrusion 10 for fixing to the iron shell 6 is provided and placed at a predetermined position.

The position at which the mesh metal member 9 is disposed varies depending on the shape of the kiln. For example, in the case of a cylindrical furnace with a high furnace height, such as a hot-blast furnace, thermal expansion stress acts more strongly in the axial direction (vertical direction) from bottom to top than in the circumferential direction (horizontal direction), and In the case of kilns with a rectangular exterior and flat walls, such as reverberatory furnaces and tunnel kilns, thermal expansion stress is stronger in the horizontal direction of the furnace than in the axial direction (vertical direction). It is important to place the net-like metal member 9 preferentially in locations where thermal expansion stress is likely to concentrate in accordance with the shape.

The mesh metal member 9 is fixed using mortar 12 as shown in FIG. 4, but the joints 8 bonded with the mortar 12 are inferior in strength to the refractory bricks 7. Therefore, in order to cover this drawback and increase adhesive strength, the mesh metal member 9 is made of metal lath, wire lath, wire mesh, and punched plates (including plates with special holes) that are approximately 1 to 2 m/m thinner than the joint thickness. ) etc., and by filling and applying mortar 12 on the upper and lower surfaces of the net-like metal member 9 and into the holes, and adhering it, the refractory bricks 7 are firmly connected to each other, and at the same time, the joints 8
strengthen.

The protrusion 10 corresponds to the conventional tension fitting 5 (see FIG. 7), and the mesh metal member 9 is attached to the backstay 1.
1 or iron skin 6,
As shown in plan view in FIG. 5, it is formed into a plate shape of a predetermined size, and through holes 13 are provided therein. For example, in the case of a furnace with a flat furnace wall and no furnace shell, such as a tunnel kiln for firing alumina powder, a backstay 11 at a position corresponding to the height of the mesh metal member 9 is installed.
After fixing the steel bar 14 to the steel bar 14 and arranging the protrusion 10 on the steel bar 14, the hook pin 15 formed in a U-shape is inserted from above so as to straddle the steel bar 14, and is inserted into the through hole 13. (1st
(see Figures and Figure 2). In addition, in the case of a kiln having a furnace shell shell, a short pipe 1 with a slightly larger inner diameter is placed inside the shell 6 at a position corresponding to the height of the mesh metal member 9.
6 is fixed and the protrusion 10 is placed on the short pipe 16 hole, and then a bolt-shaped hook pin 15A is inserted into the through hole 13,
Insert it into the short tube 16 hole and fix it so that it can slide upward and horizontally (see Figure 3).

In both embodiments, the hook pins 15, 15
Although the method of fixing to the backstay 11 or the steel shell 6 using A is adopted, in the case of a kiln with a flat furnace wall and no shell shell, the tip of the protrusion 10 may be formed in advance in a round shape. Alternatively, an elliptical ring may be fixed to the tip of the protrusion 10, and the steel bar 14 may be inserted into the ring and then fixed to the backstay 11. In addition, in the case of having a furnace shell, a bolt-shaped round steel is fixed downwardly to the tip of the protrusion 10 in advance, and the bolt-shaped round steel is fixed to the short pipe 10.
It may be inserted into six holes and fixed, and is not limited to the above embodiment.

Function The furnace wall collapse prevention structure of the present invention configured as described above has a mesh metal member 9 disposed at the joint 8 between the refractory bricks 7 forming the lining wall, thereby making it possible to prevent conventional doweled refractory bricks 2 or Special refractory bricks 2, 4 such as tensile refractory bricks 4 are no longer required, and the cause of local cracks and cracks in the refractory bricks 2, 4 that occur in the uneven dowels 1 or notches 3 is eliminated. Damage to the refractory bricks 7 can be prevented. In addition, the mesh metal members 9 can be arranged at arbitrary pitches as needed at positions where thermal expansion stress is likely to act according to the shape of the kiln, thereby increasing adhesive strength and firmly connecting the refractory bricks 7 to each other. By fixing the outer end of the mesh metal member 9 to the backstay 11 or the steel shell 6, the refractory bricks 7 are difficult to protrude to the outside or inside of the furnace, and the fixing means of the protrusion 10 can be slid freely. By doing so, even if the refractory bricks 7 move upward or horizontally due to thermal expansion stress, a predetermined tensile strength can always be maintained, and the spread phenomenon of the refractory bricks 7 falling off can be prevented. As a result, the lining wall does not collapse, and the life of the reactor can be extended.

Example Next, we will give a specific example in which the furnace wall collapse prevention structure according to the present invention is applied to a tunnel kiln, which is a furnace with a flat furnace wall and no furnace shell.Kiln furnace height 1972m /m Brick shape 230 x 114 x 65 m/m As-built height direction 65 m/m Furnace wall thickness direction 114 m/m Backstay 75 x 40 x 5 m/m Bar Steel 38 x 2140 m/m Reticulated metal member Punching plate type Shape: 920 x 114 x 2 m/m Protrusion shape: 100 x 150 x 2.3 m/m (both ends) Hook pin: 54 x 50 x 10 m/m Mesh metal member placement position Preheating zone and cooling zone furnace height lower 814.5m/m (between 12th and 13th steps),
1358.5m/m (between 20th and 21st steps), 1766.5m/m
(between the 26th and 27th stage) 3 locations in the furnace length direction, every distance between the backstays (see Figure 2) Joint thickness: 3 m/m In the above example, the conventional tunnel kiln used tensile refractory bricks. Localized cracks and fractures had occurred in the notches due to the concentration of thermal expansion stress, but a net-like metal member was placed in a position where thermal expansion stress was likely to act, and the refractory bricks were firmly connected to each other to repair the outer edge of the furnace. By fixing the parts to the backstay, we were able to prevent local cracks and cracks in the refractory bricks and improve the life of the reactor.

Effects of the invention As explained above, according to the invention, net-like metal members are arranged at arbitrary pitches as needed in the joints between the refractory bricks forming the furnace wall, increasing the adhesive strength and Since the parts are fixed to the backstay or iron shell, the connection between the refractory bricks is strengthened,
Refractory bricks protrude and fall due to thermal expansion stress,
Collapse, etc. can be prevented. In addition, there is no need to provide uneven dowels or tension fitting insertion holes (notches), and thermal expansion stress will not concentrate on local parts of the refractory bricks, causing damage such as cracks and cracks to the refractory bricks. And formwork for tensile refractory bricks is no longer required, improving production efficiency and yield (reducing refractory brick manufacturing costs). Furthermore, the overall effect is to improve the durability of the kiln, and it has great practical effects such as being useful for maintenance.

[Brief explanation of the drawing]

Figures 1 to 5 show one embodiment of the present invention; Figure 1 is a partial longitudinal sectional side view of a furnace with a flat wall and no shell shell; 3 is a partial longitudinal sectional side view of the kiln having a shell shell, FIG. 4 is a diagram illustrating the fixed state of the mesh metal member, and FIG. 5 is the mesh metal member. 6 and 7 are plan views of metal members, and FIG. 6 is an example of a conventional connection structure. FIG. 6 is a partial vertical sectional side view when using doweled refractory bricks, and FIG. 7 is a partial longitudinal sectional side view when using tensile refractory bricks. The symbols in the figure are as follows. 1... Uneven dowel, 2... Refractory brick with dowel, 3
...Notch, 4...Tension refractory brick, 5...Tension fitting, 6...Iron skin, 7...Refractory brick, 8...
... joint part, 9 ... mesh metal member, 10 ... protrusion, 11 ... backstay, 12 ... mortar,
13... Through hole, 14... Steel bar, 15, 15A...
...Hook pin, 16...Short tube.

Claims (1)

[Claims for Utility Model Registration] (1) A protrusion 10 is provided at the outer end of a mesh metal member 9 disposed at a joint 8 between refractory bricks 7 forming a furnace lining wall, and the protrusion 10 A collapse-preventing furnace wall consisting of a structure in which a backstay 11 or an iron shell 6 are fixed to the wall. (2) The collapse-preventing furnace wall according to claim 1, wherein the mesh metal member 9 is a metal lath, a wire lath, a wire mesh, or a punching plate.