JPS59191883A - Method of executing refractory in rotary kiln - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for constructing refractories in a rotary kiln.

Generally speaking, rotary kilns for firing raw materials such as cement reach extremely high temperatures inside, so in order to maintain the rotary kiln itself,
Appropriate refractory material is installed on the inner surface of the rotary kiln. However, these refractories alone have low insulation efficiency,
The following various methods of constructing refractories have been conventionally used. That is, for example, as shown in FIG. 1, there is a refractory construction method in which a heat insulating material 1 is used and the heat insulating material 1 is integrated with a refractory 2 through a chemical reaction.

However, in such a construction method, the refractory material 2 and the insulation material 1 have different expansion coefficients with respect to temperature changes, and the insulation material 1 lacks physical strength compared to the refractory material 2. There was a drawback that both the refractory material 2 and the heat insulating material 1 would crack from the part 3 integrated into the refractory material 2 and the heat insulating material 1.

Furthermore, as shown in FIG. 2, a method of constructing a refractory in which pores 4 are provided in the refractory 2 has also been used. however,
In such a construction method, the insulation performance is improved by enlarging the pores 4, but especially in large rotary kilns, the weight of the refractory itself is large, and the refractory 2 does not have the specified strength. Because of this requirement, it is not possible to provide large pores in the refractory 2, and as a result, a sufficient heat insulating effect cannot be obtained. Furthermore, in the lining of rotary kilns, etc., the rotational speeds of the kiln shell itself and the refractory material are slightly different, resulting in friction between the kiln shell and the refractory material, causing damage to the bottom of the refractory material. It also had the disadvantage of

On the other hand, as shown in FIG.
However, since the bonded part 6 lacks physical strength, the refractory 2 and the heat insulating material 5 separate due to the rotation of the rotary kill/, and the refractory 2 falls off. It had the following drawbacks.

Unfortunately, as shown in Fig. 4, a method has been used in which a cavity 7 of a predetermined size is provided in the refractory 2 and the interior of this cavity 7 is filled with a heat insulating material 8. Since the wall thickness of the refractory material 2 in the portion 7 is thinner, there is a disadvantage in that it lacks physical strength.

On the other hand, as shown in FIG.
1. A method of applying and placing it on the inner surface has also been used, but it has the disadvantage that the installation is complicated.

The present invention has been made in view of the above-mentioned drawbacks of the conventional rotary kiln, and its purpose is to prevent cracking due to temperature changes inside the rotary kiln, to have good heat insulation efficiency, and to ensure that the rotary kiln does not crack during use. The purpose of the present invention is to provide a method to prevent the bottom surface of the refractory from being damaged or falling off due to friction between the kiln shell and the kiln shell.

In order to achieve this object, in the first invention, a case is attached in close contact with the inner surface of the rotary kiln shell, a heat insulating material is filled in the case, and a case is attached adjacent to the rotary kiln mouth side of the case. In addition, in the second invention, there is a case in which a plate is erected along the negative side on the inner surface of the shell of the rotary kiln, and a heat insulating material is filled in the case. , a refractory material is arranged adjacent to the inside of the rotary kiln of this case and along the plate body.

Hereinafter, an example in which the first invention is applied to a large-sized rotary kiln will be described based on embodiments shown in the accompanying drawings.

As shown in FIG. 6, the heat insulating case 12 used in the method for installing refractories in a rotary kiln according to the present example is made of a rectangular parallelepiped with a low height, and is made of a metal or ceramic gold material. The inside of this heat insulating case 12 is filled with a suitable heat insulating material 13 in advance. This heat insulating case 12 is the inner surface 1 of the shell 15 of the rotary kiln 14.
6, and as shown in FIG.
The refractory brick 16 adjacent to ill is V51J, IM
41 so that it will be done.

Further, the refractory brick 11 used in this embodiment is slightly tapered so that the thickness gradually increases from the center of the rotary shaft of the rotary kiln 14 toward the outside of the shell 15.

When forming the inner surface of the rotary kiln using the refractory construction method for a rotary kiln according to this embodiment, as shown in FIG. Further, the heat insulating case 12 is attached to the shell 15 so as to be continuous and adjacent to the shell 15 in the circumferential direction. Next, the refractory bricks 17 are brought into close contact with the inner side of the rotary kiln of the heat insulating case 12 using a similar method, and are arranged so as to be continuous and adjacent to each other in the circumferential direction. In this case, the insulation case 12
The refractory bricks 1γ are fixed by pressing force between the heat insulating case 12 or the refractory bricks 1T in the circumferential direction of the shell 150, but an appropriate adhesive may be used if necessary.

Next, an example will be described in which the second invention is similarly applied to a large rotary kiln.

As shown in FIG. 8, the heat insulating case 18 used in the method of installing refractories in a rotary kiln according to this embodiment is a rectangular parallelepiped with a low height like the heat insulating case 12 according to the above embodiment, and A plate body 2o is erected along one side 19 of the heat insulating case 18. The heat insulating material 13 is filled in the heat insulating case 18 in advance, and the material of the case is also made of metal or ceramics.The structure of the refractory brick 17 is the same as in the previous embodiment It is.

When forming the inner surface of a rotary kiln using the refractory construction method for a rotary kiln according to this embodiment, as shown in FIG.
The inner surfaces VC1 of the shells 15 of the shells 15 are arranged so as to be able to be housed between the plate bodies 2o which are arranged in the same direction in the same direction, and between the plates 2o erected in the respective heat insulating cases 18.

Next, place the refractory bricks 17 into the respective insulation cases 18° and 18'.
The refractory bricks 17 are continuously arranged in such a way that they are sandwiched between the two plates 20 and 20'.

Moreover, FIG. 10 shows another embodiment of the second invention. Thermal insulation case 2 used in the refractory construction method according to this embodiment
1 is approximately twice the length of the thickness 13x of the refractory brick 17, e
2', a plate body 23 is erected along the two sides 22 of the heat insulating case 21, and another plate is formed approximately parallel to this plate body 23 at approximately the middle part of the case 21 in the width direction. The plate body 24 is erected, and the other configurations are the same as those of the above embodiment.

A method for constructing refractories in a rotary kiln was carried out using the heat insulating case 21 used in this example.

In this case, the number of insulation cases 21 to be installed during construction can be reduced, making the construction easier.

In addition, in the above-mentioned Tanifu example, the case where the construction method of refractories in a rotary kiln according to the present invention is applied to a large-sized rotary kiln is taken as an example and explained, but it can be applied to any rotary kiln. When applied to a small rotary kiln, the bottom and top of the heat insulating case and the bottom of the firebrick may be provided with the same curvature as the kiln shell, if necessary.

Furthermore, in each of the above embodiments, when installing a heat insulating case inside the kiln shell, the case was explained using an example in which only the heat insulating case and refractory bricks are placed adjacent to each other to form an inward direction of the kiln. As shown in FIG. 12, irregular refractories 25 or fixed refractories 26 are packed between the heat insulating case and the refractory bricks at appropriate locations on the inner surface of the kiln to further secure the insulating case and the refractory bricks to each other. It is also possible to make sure.

As explained above, in Daiichi Komei, the case is filled with heat insulating material, and refractories are placed inside the case. Because it is not a product that has been integrated by a chemical reaction,
This prevents both the insulation and the refractory from cracking due to differences in expansion rates, and since the insulation material, which has low physical strength, is housed inside the case, it prevents the insulation material itself from cracking. I can do something.

- Also, since the present invention does not obtain sensible heat efficiency by trapping pores in the refractory like conventional methods, it is possible to install an appropriately sized insulator in a large rotary kiln. In addition, it is possible to obtain a sufficient heat insulation effect even in rotary kilns of all sizes, and the physical strength of the refractory itself can be increased.

Furthermore, in the present invention, the inner surface of the kiln shell is formed using a case filled with heat insulating material in advance and a refractory material, so it is different from the conventional construction method of using a fluid material for the inner surface of the kiln shell. On the other hand, the construction work is extremely easy.

Further, in the second invention, in addition to the effects of the first invention, a plate body is provided upright along one side of the case, and the plate bodies of adjacent cases sandwich the refractory material therebetween. With this structure, the rotational deviation that occurs between the kiln shell, the heat-resistant material, and the refractory due to the rotation of the rotary kiln can be suppressed to a minimum. Furthermore, in the past, an iron plate or the like was inserted between the refractories in a wedge shape in order to suppress the displacement of the refractories caused by expansion of the refractories or rotation of the kiln, but in the present invention, the above-mentioned Because it is constructed using a case with a plate that is attached to an iron plate,
It is only necessary to insert the entire refractory between the plates of adjacent cases, which simplifies the construction work and also facilitates the replacement of aged refractories.

Furthermore, through the g1 invention and the second invention, the refractory is not directly disposed on the inner surface of the kiln shell, but is arranged on the case9, and unlike the conventional method, the refractory is arranged between the kiln shell and the refractory. The bottom surface of the large refractory is damaged due to friction, and the refractory does not fall off as a possible cause of such damage. Additionally, since the case is configured to absorb the weight of the refractory itself, even low-strength insulation materials will not be damaged and can be used for long periods of time. It is.

[Brief explanation of the drawing]

Figures 1 to 5 are explanatory diagrams showing examples of the construction of refractories in a conventional rotary kiln, and Figure 6 is an explanatory diagram showing an example of the construction of refractories in a rotary kiln according to the first invention. Similarly, FIG. 7 is an explanatory diagram showing a method for installing refractories in a rotary kiln according to the first invention, and FIG.
The figure is a perspective view showing a case used in the method for installing refractories in a rotary kiln according to the second invention, and FIG.
An explanatory diagram showing a method for installing refractories in a rotary kiln according to the invention, FIG. 10 is a perspective view showing another embodiment of the method for installing refractories in a rotary kiln according to the second invention, and FIGS. 11 and 12 are It is an explanatory view showing other examples of the first invention or the second invention. 12.18.18', 21...Case 13...
Insulating material)・114...Rotation g (p-717-Kiln 15...Shell 16...Shell inner surface 17...Refractory (firebrick) 19.22...One side of the case 20. 23.24... Plate patent applicant Sumitomo Cement Co., Ltd., 9th attorney Patent attorney Hajime Tsuchihashi (+": l', f. wa. Figure 1 Figure 3 Figure 5 Figure 6 Figure 8 Figure 1 No. 9! 2I 9^ Figure 10 No. 1 '-1) 4 Figure 12 6 7 1) , 20

Claims (2)

[Claims] (1) Attach the case tightly to the inner surface of the rotary kiln shell,
A method for constructing a refractory in a rotary kiln, comprising filling the case with a cross-sectional material and arranging the refractory adjacent to the inside of the case. (2) A case with a plate standing upright along the negative side is attached tightly to the inner surface of the rotary kiln shell, the case is filled with a heat insulating material, and the case is adjacent to the inner side of the rotary kiln, and A method for constructing a refractory in a rotary kiln, characterized in that the refractory is arranged along the plate.