TWI642889B - Block structure - Google Patents

Abstract

The invention relates to a cymbal block structure in which a metal plate and a cymbal block are integrated, which can suppress cracking of the cymbal block during manufacture or use. This block structure (A) is provided with a metal plate (1) which can cover the outer periphery of a coating object (11) made of metal, and is integrated with the metal plate (1) and mixed with CaO・ 6Al ₂ O ₃ is a slab (2) of porous heat-insulating aggregate made of minerals; the slab (2) The ratio of the thickness of) to the length of the metal plate (1) (thickness of the block / length of the metal plate) is set to 0.2 or more and 0.4 or less.

Description

Block structure

[0001] The present invention relates to a heat-preventive coating for heating equipment such as a heating furnace, and in particular, a metal coating object such as a water-cooled slide pipe, an inner wall of a furnace shell, etc. Ingot structure.

[0002] As a coating object made of metal, a water-cooled slide pipe constituting a moving beam of a heating furnace is described as an example. Specifically, conventionally, a metal insert is welded to a metal-made water-cooled slide pipe. Columns (metal embedded columns) for the construction of irregular refractories, and the water-cooled slide pipe is covered with the irregular refractories, thereby ensuring heat resistance and heat insulation. However, according to such prior art, due to the disintegration of refractories → removal of pillars → coating base treatment of slides → welding of pillars → erection and flow of amorphous refractory frames → maturation → removal of frames, etc. There are many steps and a large number of embedded columns (generally 20 to 30 pieces / m, so thousands of pieces / furnace). These problems require a lot of labor and time, which is the problem. [0003] In order to solve this problem, for example, in Patent Document 1, a method has been proposed in which metal inserts are provided on a metal plate to form a block of heat-insulating block, and on-site construction of the slide pipe is performed by welding. . In addition, in the patent document 2, the applicant of the present application has proposed "a kind of concrete block structure having a metal plate on the outer periphery of a coating object made of metal, and a ceramic piece connected to this metal plate. The embedded column and the block made of an irregular refractory material held in the embedded column are characterized in that the embedded column is connected to be movable relative to the metal plate. [0004] According to such a block structure in which a metal plate and a block are integrated, the covered object can be fire-resistant covered only by welding the metal plate to the outer periphery of the covered object. Compared with the case where the embedded column is welded to the covered object, the workability is particularly improved. [0005] However, as a result of repeated tests performed by the present inventors on this block structure, it was found that cracks may occur in the block during manufacture or use. [Prior Art Document] [Patent Document] [0006] [Patent Document 1] Korean Public Patent Publication No. 2001-0048087 [Patent Document 2] Japanese Patent Laid-Open No. 2016-104899

[Problems to be Solved by the Invention] [0007] A problem to be solved by the present invention is to suppress a lumpy block that occurs during manufacture or use of a lumpy block structure in which a metal plate and a cymbal block are integrated. Cracking. [Means for Solving the Problems] [0008] In order to solve the above problems, the present inventors focused on the conditions for the integration of the metal plate and the cymbal repeatedly, and found that in order to suppress the occurrence of cracks in the cymbal, The ratio of the thickness of the block to the length of the metal plate is important. [0009] That is, according to one aspect of the present invention, there is provided a "預鑄 block structure comprising: a metal plate that can cover the outer periphery of a coated object made of metal; and a metal plate that is integrated with the metal plate and blended therewith. A block of a porous heat-insulating aggregate made of CaO · 6Al ₂ O ₃ as a mineral; characterized in that the block is in a cross section perpendicular to the longitudinal direction of the metal coated object The ratio of the thickness to the length of the above-mentioned metal plate (thickness of the slab / the length of the metal plate) is 0.2 or more and 0.4 or less ". [Effects of the Invention] [0010] According to the present invention, a cymbal block structure in which a metal plate and a cymbal block are integrated can suppress cracking of the cymbal block during manufacture or use. As a result, compared with the prior art, the effect of improving the workability, especially the structure of the block, can be fully exerted in practice.

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 and Fig. 2 show an embodiment of a stilt structure according to the present invention. In addition, FIG. 3 shows the water-cooled slide pipe covered with the refractory block structure of FIG. 1 and FIG. 2, and FIGS. 4 and 5 show the II section and the II-II section of FIG. 3, respectively. [0013] The cymbal block structure A shown in FIG. 1 and the cymbal block structure B shown in FIG. 2 are both obtained by integrating the metal plate 1 and the cymbal block 2. In the embodiment, the integration of the metal plate 1 and the cymbal block 2 uses a metal insert 3 (see FIGS. 4 and 5). However, the means of integration is not limited to this. For example, as disclosed in Patent Document 2, ceramic inserts may be used for integration. [0014] The metal plate 1 has a shape that can cover the outer periphery of a coating object made of metal. Specifically, the metal plate 1 of the cymbal block structure A in FIG. 1 has a semicircular shape that can be covered with a cylindrical slide support pillar 11 (refer to FIG. 4) as an object to be covered, and a preliminary view in FIG. 2. The metal plate 1 of the ingot structure B has a partially elliptical shape that can be covered with an elliptic cylindrical runner beam 12 (see FIG. 5) as a coating object. On the other hand, the briquette 2 is composed of an irregular refractory material (CA6 lightweight castable refractory material) blended with a porous heat-insulating aggregate made of CaO · 6Al ₂ O ₃ as a mineral. This CA6 lightweight castable refractory has the characteristics of light weight, low thermal conductivity, and excellent fouling resistance and fouling resistance, which can improve the thermal insulation effect of the block structures A and B. [0015] Using these block structures A and B, the water-cooled slide pipe 10 is fire-resistant coated as shown in FIG. 3. Specifically, as shown in FIG. 4, the slide post 11 of the water-cooled slide pipe 10 is made of two slab blocks A in the circumferential direction for fire-resistant coating. At this time, the metal plate 1 is welded to the slide pillar 11, and this welding can be easily and reliably performed by using a gap (a gap provided for welding) provided by the end portion 1 a of the metal plate 1. After welding, the gap provided by the end portion 1 a of the metal plate 1 is filled with the patch material 4. On the other hand, as shown in FIG. 5, the slide beam 12 of the water-cooled slide tube 10 uses two slab blocks B in the circumferential direction for fire-resistant coating. At this time, the metal plate 1 is welded to the slide beam 12. This welding is also easily and surely performed by using the gap provided by the end portion 1 a of the metal plate 1. After welding, the metal plate 1 is welded by the metal plate 1. The gap provided at the end portion 1 a is filled with the patch material 4. In addition, the gap between the adjacent block structures B and B in the circumferential direction becomes the upper part of the slideway beam 12, and the upper part of the slideway beam 12 is composed of the patch material 4 to support the metal slide of steel. The track pads 13 are provided thereon at appropriate intervals. In addition, the joint portion between the slide pillar 11 and the slide beam 12 is also composed of the patch material 4. [0016] In this embodiment, the Al ₂ O _3- containing component is provided between 70% by mass of the lumpy block structures A and A adjacent to the longitudinal direction and between the lumpy block structures B and B. The above-mentioned fiber (alumina fiber) C (refer to C in FIG. 3). The part provided with this fiber C is the so-called expansion clearance. The CaO component in the light-weight castable refractory material reacts with the alumina component in the fiber to generate CA2 (CaO · 2Al ₂₎ due to the heating during initial use. O ₃ ) or CA6 (CaO · 6Al ₂ O ₃ ). In addition, CA2 and CA6 produced by the above-mentioned reactions show the same expansion and contraction behavior as CA6 lightweight castable refractories. Based on this, it is possible to suppress the expansion clearance set between adjacent concrete block structures from generating a gap during use. Moreover, the expansion clearance itself can be ensured, so it is possible to suppress cracks or ruptures of the lumps caused by the stress caused by thermal expansion. Further, fibers C may be provided between the lumpy block structures A and A adjacent to each other in the circumferential direction and between the lumpy block structures B and B. [0017] In the above configuration, the stern block structures A and B of the present invention are characterized in that the longitudinal direction of a metal-covered object (chute support 11 and runner beam 12) is orthogonal to the In the cross section, specifically, in FIGS. 4 and 5, the ratio of the thickness of the cymbal block 2 to the length of the metal plate 1 (thickness of the cymbal block / length of the metal plate) is 0.2 or more and 0.4 or less. If the value of this ratio is large (the thickness of the cymbal block 2 is too large), the cymbal block 2 becomes susceptible to cracking during use, and the peel resistance is reduced. This is presumably because the temperature gradient between the inner peripheral side and the outer peripheral side of the lumpy block 2 becomes larger as the thickness of the lumpy block 2 increases. In addition, as the thickness of the slab block 2 increases, the weight of the slab block structure increases, so workability decreases. In view of this, it is necessary to set the above ratio to 0.4 or less. On the other hand, if the above ratio is small (the thickness of the lumps 2 is too small), the strength of the lumps 2 is particularly insufficient, and cracks are liable to occur in the lumps 2 especially during manufacture. [0018] In the present invention, the "thickness of a slab" means the thickness in a direction orthogonal to a metal plate in a cross section orthogonal to the longitudinal direction of a coated object made of metal, and the "metal plate" The "length" refers to the length of the metal plate along the circumferential direction of the metal coated object in a cross section perpendicular to the longitudinal direction of the metal coated object. [Examples] [0019] The semi-cylindrical cymbal block structure A (hereinafter referred to as "type A") shown in FIG. 1 and the partially elliptical cymbal block structure shown in FIG. 2 Body B (hereinafter referred to as "type B"), as shown in Table 1, evaluates the presence or absence of cracks, workability, and resistance to spalling during the manufacture of a block structure in which the thickness of the block and the length of the metal plate change Sex. In addition, in Table 1, a block is described only as a "block." [0020] Regarding the presence or absence of cracks during the manufacturing process, the amorphous refractory material (CA6 lightweight castable refractory material) is kneaded with a specific moisture content, and after being cast into the shape of each block, it is matured and removed. The steps of removing the frame and drying are evaluated by the presence or absence of cracks during implementation. In Table 1, those without cracks are marked as ○, and those with cracks are marked as ×. The workability is evaluated based on the weight of the concrete block structure. In Table 1, those who weigh less than 40 kg are marked as ○, and those who weigh 40 kg or more are marked as ×. Regarding spalling resistance, the outer peripheral surface of the concrete block structure was repeatedly heated to 1300 ° C, and then subjected to forced air cooling, a heating and cooling cycle of 5 times, and the presence or absence of cracks was evaluated. In Table 1, those without cracks are marked as ○, and those with cracks are marked as ×. In addition, this evaluation of peel resistance is based on whether or not cracks have occurred during use. [0021] [0022] As shown in Table 1, Examples 1 to 4 (types) in which the ratio of the thickness of the cymbal block to the length of the metal plate (thickness of the cymbal block / length of the metal plate) is 0.2 or more and 0.4 or less A) and Examples 5 and 6 (type B), no cracks occurred during manufacture, and the workability and peel resistance were good. [0023] On the other hand, in Comparative Examples 1, 3 (Type A) and Comparative Example 5 (Type B) where the above-mentioned ratio is lower than 0.2, cracks occurred during manufacturing. Further, Comparative Examples 2, 4 (Type A) and Comparative Example 6 (Type B) whose ratios were higher than 0.4 had poor peel resistance, and it was judged that the lumps were liable to crack during use. In addition, in Comparative Examples 1, 3, and 5 in which cracks occurred at the time of manufacture, evaluation of peeling resistance could not be performed.

[0024]

A, B‧‧‧ 預鑄 block structures

C‧‧‧ fiber (alumina fiber)

1‧‧‧ metal plate

1a‧‧‧ end of metal plate

2‧‧‧ block

3‧‧‧ metal insert

4‧‧‧ Patchwork

10‧‧‧Water cooled slide pipe

11‧‧‧Slide Support

12‧‧‧slide beam

13‧‧‧Slide block

[0011] FIG. 1 is a perspective view showing a cymbal block structure according to an embodiment of the present invention. (2) FIG. 2 is a perspective view showing a stilt block structure according to another embodiment of the present invention. (3) Figure 3 is a perspective view showing a water-cooled slide pipe covered with a fire-resistant coating of the block structure shown in Figures 1 and 2. Figure 4 is a sectional view taken along line I-I in Figure 3. Figure 5 is a sectional view taken along line II-II in Figure 3.

Claims (1)

A block structure comprising: a metal plate capable of covering the outer periphery of a coated object made of metal; and a porous heat insulator integrated with the metal plate and blended with CaO · 6Al ₂ O ₃ as a mineral The lumpy block of flexible bone is characterized by the ratio of the thickness of the lumpy block to the length of the metal plate in a cross section perpendicular to the longitudinal direction of the metal coated object (the length of the lumpy block) Thickness / length of the metal plate) is 0.2 or more and 0.4 or less.