JP5549058B2 - Refractory joint construction method and refractory joint structure - Google Patents

Description

  The present invention relates to a refractory joint construction method and a refractory joint structure.

A kiln such as a coke oven has a joint structure portion that is slid so as not to cause interference due to different thermal expansion between different refractories and between refractories / metals during drying and heating.
In such a position, a heat-resistant fiber sheet, iron plate or resin sheet is sandwiched between them, but it does not slip as expected, and it has low heat resistance and low hot strength, so it slides reliably under high temperature conditions. It is very difficult to make. In addition, when an organic resin sheet material is used, there is a problem in terms of the environment because it may disappear during heating or a combustion gas may be emitted.

For example, in the technique described in Patent Document 1, it is proposed to use a fiber sheet as a sheet material of a slide part.
Moreover, in the technique described in Patent Document 2, as the structure of the ceiling portion of the coke oven, a graphite mortar, an Al—Cu alloy thin plate containing duralumin, a heat-resistant thin steel plate, BN, carbon nitride powder or the like can be applied to the joint. It is stated.

JP 2004-131514 A JP-A-7-258648

However, in the technique described in Patent Document 1, the fiber sheet is crushed by the load of the refractory, and it is difficult to say that it is always easy to slide. In addition, when the temperature exceeds 1000 ° C, the amorphous (glass) component contained in the fiber sheet reacts with the refractory and, on the contrary, comes to have an adhesive function, and a long-term sliding function at high temperatures. Is difficult to maintain. Furthermore, although other materials are suggested in Patent Document 1, specific materials are not illustrated.
In the technique described in Patent Document 2, the heat resistance temperature is low for metals, or there is a problem of chemical reaction with a refractory during long-term use. The problem still remains when used for a long time.

  An object of the present invention is to provide a joint method for a refractory joint that can surely exhibit a slide function in a refractory structure and can be used stably without opening the joint, and a refractory having a slide function. The purpose is to provide a joint structure for objects.

The gist of the present invention is as follows.
(1) A construction method for joints between refractories constituting the refractory structure,
Adhering and fixing the slidable sheet to the constructed refractory surface using an air-hardening mortar having a leveling function with the sliding surface on the surface side;
A process of superimposing the slidable sheet with the sliding surface facing the adhesively slidable sheet surface;
And a step of bonding and fixing the refractory to the laminated slidable sheet using an air-hardening mortar having a leveling function ,
The slidable sheet is a mica sheet containing natural mica of muscovite, phlogopite, or sericite on a sliding surface.

(2) The method for enforcing a joint for a refractory, wherein the refractory structure according to (1) is a partition part that partitions a combustion chamber of a coke oven and a bellows part below the combustion chamber .
( 3 ) In the construction method for joints of refractories as described in (1) or (2),
Three or more slidable sheets are superposed on each other.

( 4 ) In the construction method of the joint of the refractory according to any one of (1) to (3),
The step of superimposing the slidable sheets is a construction method for joints of refractories, wherein the slidable sheets are previously integrated with each other.

( 5 ) A joint structure between refractories constituting the refractory structure,
In the joint portion between the refractories, at least two slidable sheets with the sliding surfaces overlapped are interposed,
Adhering and fixing the slidable sheet and the refractory using a pneumatic mortar having a leveling function,
The slidable sheet is a mica sheet containing natural mica of muscovite, phlogopite, or sericite on the sliding surface.

According to the present invention, since the sliding surfaces of at least two or more slidable sheets face each other and overlap each other, the slide function can be surely expressed, so the temperature distribution condition between the refractories, Interference and void generation due to a difference in thermal expansion caused by the difference in material can be prevented, and a refractory structure that can be used stably for a long period can be constructed.
Moreover, if the refractory structure is a furnace such as a coke oven, interference due to thermal expansion is prevented, so that the occurrence of cracking of the refractory can be prevented, and further, the joint that follows the expansion of the furnace body after operation. The structure can be expected to prevent gas leakage.

In the present invention, the refractory refers to a material that causes joints during construction, and examples thereof include a precast block of an irregular refractory and a fired body such as brick. In addition, various shapes of the refractory can be considered, and examples include a regular refractory having a rectangular parallelepiped shape and an irregular refractory having a trapezoidal shape or a circular cross section.
Moreover, it is preferable that the adhesive used in the process of bonding the slidable sheet has a leveling function.
Here, the leveling function refers to a function of improving flatness and reducing unevenness. As the adhesive having the leveling function, for example, an air-hardening mortar can be employed.
According to this invention, since the adhesive has a leveling function, the adhesive surface can be made flat, so that the sliding surface of the slidable sheet bonded and fixed thereon can be made flat. The slide function can be expressed more reliably.

In the present invention, three or more slidable sheets may be stacked.
According to this invention, since the slide function in the joint becomes easier to express by overlapping three or more slidable sheets, the durability of the refractory structure can be further improved by the expression of the slide function. it can.
In the present invention, the step of superimposing the slidable sheets preferably integrates the slidable sheets in advance.
Here, the slidable sheets may be integrated by putting the sliding surfaces of the slidable sheets facing each other and superimposing them, and attaching an adhesive tape or the like to the sheet end.
According to this invention, by integrating the slidable sheets, at the time of construction, it does not slip by the sliding surface of the slidable sheet, and only by constructing one slidable sheet, Construction of the slidable sheets to be overlaid can also be completed, and construction can be performed efficiently.

In the present invention, as the slidable sheet, those containing a cleaving substance such as graphite and BN on the sliding surface can be adopted, but a mica sheet containing mica on the sliding surface is adopted. Is preferred.
The mica sheet is made of a scaly powder made by crushing and classifying natural mica minerals such as muscovite and sericite to a thickness of 5 μm or less, and a heat-resistant resin such as a silicone resin is used as a binder. It is obtained by manufacturing by processing into a sheet with a uniform thickness, and a thickness of 0.2 mm to 1.5 mm can be adopted.
Mica has its own cleavage property, so its surface is very smooth when made into a sheet. Moreover, since it is a clay mineral, the heat resistance temperature is as high as 600 ° C. or higher, and its smoothness is stable up to about 1000 ° C.
With the present invention using a mica sheet having a heat resistance of 600 ° C. or more, even when the refractory is in a high temperature state due to combustion like a coke oven, the slide function is maintained and the durability of the refractory structure is maintained. Can be improved.
In addition, even after a few years after full-scale operation, even if the mica sheet is decomposed by a high-temperature intrusion gas or the like, the components are maintained in the SiO ₂ , Al ₂ O ₃ system and are bonded like Fe ₂ O _3. Since there is almost no component that forms a low melting point product in the part, troubles such as abnormal melting damage do not occur.

The present invention can enjoy the same operation and effect as the above-described operation and effect as well as the above-described refractory joint construction method as well as the refractory joint structure.
That is, the joint structure according to the present invention is a joint structure of a refractory constituting the refractory structure, and at least two slidability obtained by superimposing sliding surfaces on the joint portion between the refractories. This is a joint structure in which a sheet is interposed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a joint structure of a refractory according to an embodiment of the present invention. The joint structure of the refractory is formed between the brick 1 and the brick 2 having different materials or temperature conditions. Between the bricks 1 and 2, the mortar 3, the mica sheet 4, and the mica sheet 5 are formed. Is intervening.
This joint structure of the refractory is applied to a partition portion that partitions the combustion chamber of the coke oven and the bellows portion below the coke oven. For example, in the partition portion, on the brick 1 arranged on the bellows portion side, on the combustion chamber side. It is configured by stacking bricks 2 to be arranged. The brick 2 disposed on the upper combustion chamber side is slowly heated to approximately 1200 ° C. by the heat of the combustion chamber, but the temperature of the lower bellows portion is lower than that. Therefore, in the prior art that does not include the mica sheets 4 and 5, the joint on the brick 1 side is opened due to a difference in thermal expansion, or a void is generated in a severe case. Interference and void generation due to the generated thermal expansion difference can be prevented, and a refractory structure that can be used stably for a long period of time can be constructed.

In addition, the joint structure of this refractory can also be used between the quartz brick and the clay brick at the kiln entrance of the coke oven, between the clay brick and the protective plate, and further constitutes the bottom of the coke oven It can also be used as a joint structure between the red brick and the quartz brick on it.
Moreover, this joint structure of a refractory can be employed not only as a coke oven, but also as a joint structure between a heat-insulating brick such as a refining vessel and a refractory brick.
Furthermore, the refractory is not limited to the fired brick, and may be applied to a joint structure of a precast block that is cured by applying an amorphous refractory.

The mortar 3 is used for bonding and fixing the mica sheet 4 to the brick 1 and the mica sheet 5 to the brick 2, and at the same time, leveling that flattens the sliding surfaces of the mica sheet 4 and the mica sheet 5. Also functions as a material. The mortar 3 preferably employs an air-hard mortar. For example, as a silica-based air-hard mortar, a slurry obtained by kneading a powder obtained by adding a binder such as dextrin based on a fired silica brick powder with water. It can be formed by curing.
The thickness of the mortar 3 between the brick 1 and the mica sheet 4 is preferably 1 mm or more and 4 mm or less. The reason is that, in order to level the unevenness of the surface of the brick 1, it is preferable that the thickness is at least 1 mm. On the other hand, the thickness that is appropriately cured by moisture absorption is preferably 4 mm or less.

The mica sheets 4 and 5 as the slidable sheets are combined with the sliding surfaces facing each other, and are obtained by crushing and classifying natural mica minerals such as muscovite and phlogopite to a thickness of 5 μm or less. A sheet-like powder is made and processed into a sheet with a uniform thickness using a silicone resin as a binder.
The thickness of the mica sheets 4 and 5 is preferably 0.2 mm to 1.5 mm. If the thickness is less than 0.2 mm, the mica sheets 4 and 5 may be damaged at the time of operation, and appropriate elasticity cannot be ensured. On the other hand, if the thickness exceeds 1.5 mm, a thick material is difficult to produce a sheet having a uniform thickness, and the amount of expensive mica in the mica sheets 4 and 5 increases, resulting in the cost of the material constituting the joint structure. Soars. In order to ensure the possibility of breakage during work and appropriate elasticity, and to ensure a uniform thickness, it is more preferable to employ a thickness of approximately 0.5 mm.

The representative composition of the mica sheets 4 and 5 varies slightly depending on the mica used, but for example, the following composition can be adopted (the variation is ± 2.0 mass%).
SiO ₂ : 45.4% by mass
Al ₂ O ₃ : 38.2% by mass
K ₂ O: 11.2% by mass
Ig. Loss: 5.2% by mass
The mica sheets 4 and 5 can be exemplified by two types, type 1 and type 2, and in each case, the heat resistance is 600 ° C. or higher, and as shown in FIGS. 3 and 4, up to 600 ° C. It can be seen that there is little bending strength and loss on heating, and that the heat resistance is good.

In the present embodiment, as shown in FIG. 1, the sliding function is secured in the joint structure formed between the brick 1 and the brick 2 using the two mica sheets 4 and 5. Not limited to. That is, as shown in FIG. 2, a joint structure between the bricks 1 and 2 in which the sliding function is secured by interposing three mica sheets 4, 5 and 6 between the bricks 1 and 2 may be adopted. .
In addition, if the number of mica sheets 4, 5, and 6 is increased, the slide function is further improved. However, in view of cost effectiveness, 2 to 3 sheets are the best.

Next, a joint construction method for a refractory according to the present embodiment will be described with reference to FIG.
First, the brick 1 on the bellows part side is constructed (step S1).
The slurry-like mortar 3 kneaded on-site is applied to the surface of the brick 1 applied, and the upper surface of the mortar 3 is smoothed (step S2).

The mica sheets 4 and 5 are constructed on the top surface of the mortar 3. At this time, the ends of the mica sheets 4 and 5 are integrated in advance with a resin tape or the like, and the mica sheets 4 and 5 are simultaneously placed on the mortar 3. Install and fix (step S3). Although it is possible to construct the mica sheets 4 and 5 separately, the mica sheets 4 and 5 are difficult to construct because the sliding surfaces face each other and are slippery. It is easier to install if it is bonded and fixed on top. Note that the tape integrated with the mica sheets 4 and 5 disappears when the coke oven is heated, so that the slide function is not impaired.
The slurry-like mortar 3 is applied to the surface of the brick 2, and the surface on which the mortar 3 is applied is disposed so as to face the surface of the applied mica sheets 4 and 5, and then pressed onto the mica sheets 4 and 5, The brick 2 is constructed on the mica sheets 4 and 5 (step S4).
Thereafter, the mortar 3 is applied to the other bricks 2 in the same manner, and the construction of the bricks 2 is repeated to form a construction body made of the bricks 2 (step S5).

  By adopting such joint structure according to the present embodiment, as shown in FIG. 6, in the process in which the brick 2 on the combustion chamber side is heated to approximately 1200 ° C., the brick 1 on the bellows part side is interposed. Even if structural distortion occurs due to the difference in thermal expansion, the sliding surfaces of the mica sheets 4 and 5 can slide and can surely exhibit a sliding function. The resulting joint opening and void generation do not occur, and the coke oven, which is a refractory structure, can be structured to withstand long-term use.

Sectional drawing showing the joint structure of the refractory material which concerns on embodiment which concerns on this invention. Sectional drawing showing the joint structure used as the deformation | transformation of the said embodiment. The graph showing the physical property of the slidable sheet which concerns on the said embodiment. The graph showing the physical property of the slidable sheet which concerns on the said embodiment. The schematic diagram for demonstrating the construction method of the joint of the refractory material in the said embodiment. Sectional drawing for demonstrating the effect | action of the said embodiment.

Explanation of symbols

1 ... Brick, 2 ... Brick, 3 ... Mortar, 4 ... Mica sheet, 5 ... Mica sheet

Claims (5)

It is a construction method of joints between refractories constituting the refractory structure,
Adhering and fixing the slidable sheet to the constructed refractory surface using an air-hardening mortar having a leveling function with the sliding surface on the surface side;
A process of superimposing the slidable sheet with the sliding surface facing the adhesively slidable sheet surface;
And a step of bonding and fixing the refractory to the laminated slidable sheet using an air-hardening mortar having a leveling function ,
The slidable sheet is a mica sheet containing natural mica of muscovite, phlogopite, or sericite on a sliding surface. The said refractory structure of Claim 1 is a partition part which partitions off the combustion chamber of a coke oven, and the bellows part below it, The enforcement method of the joint of the refractory characterized by the above-mentioned. In the construction method of the joint of the refractory according to claim 1 or claim 2,
Three or more slidable sheets are superposed on each other. In the construction method of the joint of the refractory according to any one of claims 1 to 3,
The step of superimposing the slidable sheets is a construction method for joints of refractories, wherein the slidable sheets are previously integrated with each other. A joint structure between the refractories constituting the refractory structure,
In the joint portion between the refractories, at least two slidable sheets with the sliding surfaces overlapped are interposed,
Adhering and fixing the slidable sheet and the refractory using a pneumatic mortar having a leveling function,
The slidable sheet is a mica sheet containing natural mica of muscovite, phlogopite, or sericite on the sliding surface.

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