Installation method of fireproof tiles for protecting boiler water tubes

Abstract

To easily and accurately align and install a plurality of refractory tiles at predetermined positions. [Solution] The method includes a first step of hooking one fireproof tile 2 as a reference tile 2-1 onto a reference hook 5-1 without applying a fireproof joint material; a second step of aligning and fixing one fireproof tile 2-2 different from the reference tile 2-1 with the reference tile; a first branch step of, after the second step, removing the reference tile 2-1 from the reference hook 5-1 and aligning and fixing it with the fireproof tile 2-2 fixed in the second step; or a second branch step of hooking one fireproof tile 2-3 different from the fireproof tiles 2-2 fixed in all previous steps of this step onto an unused hook 5-3 one hook away from the hook on which the fixed fireproof tile 2-2 was hooked, and fixing it while aligning it with the fixed fireproof tile 2-2; and a fourth step of repeating the third step a predetermined number of times after the third step.

Description

[Technical Field]

[0001] The present invention relates to a method for installing refractory tiles for protecting boiler water tubes. [Background technology]

[0002] In facilities equipped with boilers, such as waste incineration plants that generate electricity while incinerating waste and power plants that burn fuels such as coal, i.e., combustion plants equipped with boilers, multiple boiler water tubes are installed on the furnace wall of the combustion furnace. Generally, the multiple boiler water tubes are installed vertically and spaced apart at equal intervals horizontally, i.e., evenly spaced. Two horizontally adjacent boiler water tubes are connected without gaps by plate-shaped fins, and these boiler water tubes and fins form a water tube panel.

[0003] To protect these boiler water tubes from excessive heat, refractory tiles are sometimes installed on the surface of the boiler water tubes facing the furnace in the water tube panel (hereinafter, referred to as "installing refractory tiles on the top surfaces of boiler water tubes"). For example, one technique for this purpose involves evenly distributing hooks on the fins of the water tube panel to mechanically support the refractory tiles (see Patent Document 1). According to this technique, a refractory joint material such as mortar is applied to the back surface of a rectangular refractory tile, and the hooks are hooked into depressions (hereinafter, referred to as "recesses") located near the center of the back surface of the refractory tile. The refractory tile is then pressed against the water tube panel, thereby securing the refractory tile to two adjacent boiler water tubes on either side of the hooks. By repeating this process, multiple refractory tiles are installed on the top surfaces of multiple boiler water tubes with a gap between them to allow for thermal expansion.

[0004] When installing a large number of fire-resistant tiles, for example, nine fire-resistant tiles arranged in a rectangular shape are used as one tile group, and fire-resistant joint material is applied to the gaps between adjacent fire-resistant tiles within one tile group, and a fire-resistant expansion filler such as fiber cast is embedded in the gaps between one tile group and the adjacent tile group (see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3176108 [Patent Document 2] Patent No. 3122422 Summary of the Invention [Problem to be solved by the invention]

[0006] Each of the multiple fireproof tiles is installed sequentially by being hooked onto a corresponding hook from among multiple hooks that are pre-installed evenly on the water pipe panel, so it is expected that they will be aligned and arranged without any misalignment as designed. However, due to the influence of the fireproof joint material applied to the recesses on the back surface of the fireproof tile, the relative positions of the fireproof tile and the hook may be slightly displaced from the predetermined position. In this case, because the misalignment of each refractory tile is small, the worker may not notice the misalignment and continue installing the refractory tiles. As a result, the small misalignments of each refractory tile accumulate, and when a large number of refractory tiles are installed, the overall installation may become significantly misaligned or distorted, requiring the installation to be redone.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a construction method for easily and accurately aligning and installing multiple refractory tiles for protecting boiler water tubes in predetermined positions. [Means for solving the problem]

[0008] The present invention is a type of installation method for refractory tiles to protect boiler water tubes, in which a plurality of rectangular refractory tiles are aligned and fixed to a water tube panel that includes a plurality of boiler water tubes evenly spaced horizontally, a plurality of fins connecting two horizontally adjacent boiler water tubes, and a plurality of hooks attached to the fins. The hooks are fixed to the fins in a regular arrangement corresponding to the positions of the recesses formed on the back surfaces of the refractory tiles to be aligned. Then, a fireproof joint material is applied to the back surfaces of the refractory tiles, and the hooks, the number of which corresponds to the number of recesses provided on one refractory tile, are hooked into the recesses and fixed, so that the multiple refractory tiles are aligned at predetermined intervals, and one refractory tile is fixed to the top surfaces of two or more boiler water tubes.

[0009] The present invention is characterized by at least the following steps: a first step of using one of the plurality of refractory tiles as a reference tile, and arranging the tile without applying a fireproof joint material to a back surface of the reference tile by hanging it on a number of reference hooks among the plurality of hooks corresponding to the number of recesses formed on the back surface of the reference tile; a second step of applying a fireproof joint material to the back surface of one of the plurality of fireproof tiles that is different from the reference tile, and then hooking the fireproof tile coated with the fireproof joint material onto a number of hooks corresponding to the number of recesses, including the hook immediately adjacent to the reference hook, among the plurality of hooks, and then aligning the fireproof tile with the reference tile while pressing the fireproof tile coated with the fireproof joint material against the water pipe panel to fix it; a first branching step of, after the second step, removing the reference tile from the reference hook, applying a fireproof joint material to the backside of the tile, and then hooking the reference tile onto the reference hook, and then, while aligning it with the fireproof tile fixed in the second step, pressing the reference tile towards the water pipe panel to fix it; and a second branching step of, among the plurality of fireproof tiles, applying a fireproof joint material to the backside of one fireproof tile different from the fireproof tiles fixed in all previous steps of this step, and hooking the fireproof tile to which the fireproof joint material has been applied onto hooks to which no fireproof tile has been hung, including the hook immediately adjacent to the hook to which the fireproof tile fixed in the step immediately before this step or the step two steps before this step has been hung, and which corresponds to the number of recesses, and then, while aligning it with the fireproof tile fixed in the step immediately before this step or the step two steps before this step, pressing the fireproof tile to which the fireproof joint material has been applied towards the water pipe panel to fix it. The method includes at least a fourth step of repeating the third step a predetermined number of times after the third step. [Effects of the Invention]

[0010] According to the construction method of the present invention, in the first step, the back surface of the fireproof tile that will serve as the reference tile is not coated with fireproof joint material, and the reference tile is placed by hooking it onto reference hooks, the number of which corresponds to the number of recesses formed on the back surface. Because no fireproof joint material is applied, the reference tile is simply hooked onto the reference hooks. As a result, the reference hooks penetrate to the deepest part of the recesses on the back surface and come into direct contact with the reference tile, so the vertical and horizontal positions of the reference tile are positioned as designed. In the second step, a fireproof joint compound is applied to the back of another fireproof tile different from the reference tile, and the new refractory tile is hooked onto the hooks, the number of which corresponds to the number of recesses on the back of the new refractory tile, including the hook next to the reference hook. The fireproof joint compound that has entered the recesses on the back of the new refractory tile may prevent direct contact between the fireproof tile and the hooks in the recesses, and depending on the skill of the worker, the new refractory tile may deviate from its designed position. However, since the reference tile immediately adjacent to the new refractory tile, which has simply been hooked onto the reference hook, is in the designed position, the new refractory tile can be aligned and fixed as designed by comparing it with the reference tile. In the third step, the other refractory tile fixed in the designed position in the second step can be used as a new reference for alignment, and therefore, a refractory tile to be placed immediately adjacent to the other refractory tile can be similarly accurately aligned based on the other refractory tile that has become the new reference, and fixed in the designed position. Then, in the fourth step, the third step is repeated a predetermined number of times, so that the new reference refractory tile is replaced in sequence, and multiple rectangular refractory tiles can be aligned and fixed as designed.

[0011] Therefore, according to the present invention, it is possible to provide a construction method for simply and accurately aligning and installing a plurality of refractory tiles for protecting boiler water tubes at predetermined positions. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic front view showing a water pipe panel and a refractory tile to which a construction method according to an embodiment is applied. [Figure 2] 2 shows the fireproof tile shown in FIG. 1, where (A) is a front view seen from the front surface, (B) is a rear view seen from the rear surface, and (C) is a top view seen from the arrow A in (A). [Figure 3] 1 shows an interlocking type first refractory tile, where (A) is a front view seen from the front surface, (B) is a rear view seen from the back surface, (C) is a top view, (D) is a bottom view, and (E) is a cross-sectional view along line BB of (A). [Figure 4] 1 shows an interlocking type second refractory tile, where (A) is a front view seen from the front surface, (B) is a rear view seen from the rear surface, (C) is a top view, (D) is a bottom view, and (E) is a cross-sectional view along line CC of (A). [Figure 5] 1 shows an interlocking type third refractory tile, where (A) is a front view seen from the front, (B) is a rear view seen from the back, (C) is a top view, (D) is a bottom view, and (E) is a cross-sectional view of (A) along line DD. [Figure 6] FIG. 10 is a schematic front view showing an example of a water pipe panel on which interlocking refractory tiles are installed. [Figure 7] FIG. 7 is a schematic front view of a water pipe panel after fireproof tiles have been laid, showing an example of a tile set different from that in FIG. 6. [Figure 8] FIG. 8 is a schematic front view of a water pipe panel after fireproof tiles have been laid, showing an example of tile assembly different from the tile assembly in FIGS. 6 and 7. [Figure 9] 1 shows a first half-type refractory tile similar to an interlocking first refractory tile, where (A) is a front view seen from the front, (B) is a rear view seen from the back, (C) is a bottom view, (D) is a top view, and (E) is a cross-sectional view of (A) along line EE. [Figure 10]This shows a first half-type refractory tile similar to an interlocking second refractory tile, where (A) is a front view seen from the front, (B) is a rear view seen from the back, (C) is a bottom view, (D) is a top view, and (E) is a cross-sectional view of line FF of (A). [Figure 11] This shows a first half-type refractory tile similar to the interlocking third type refractory tile, where (A) is a front view seen from the front, (B) is a rear view seen from the back, (C) is a bottom view, (D) is a top view, and (E) is a cross-sectional view along line GG of (A). [Figure 12] FIG. 10 is a schematic front view showing an example of a water pipe panel to which first and second half-split refractory tiles are applied. [Figure 13] FIG. 1 is a perspective view showing a block-type refractory tile. [Figure 14] FIG. 10 is a perspective view showing a modified example of a block-type refractory tile. [Figure 15] FIG. 1 is a schematic front view showing an example of a water pipe panel on which large refractory tiles are installed. [Figure 16] FIG. 10 is a schematic front view showing an example of a water pipe panel on which another type of large refractory tile is installed. [Figure 17] FIG. 1 is a schematic front view showing an example of a water pipe panel after installation of fireproof tiles, which is used to explain an installation method according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] A method for installing refractory tiles for protecting boiler water tubes according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 17. For ease of explanation, a Cartesian coordinate system with X, Y, and Z axes will be used in the drawings. Here, the Z axis is vertical, and the X and Y axes are horizontal. The Z axis indicates the vertical direction, i.e., the direction in which multiple refractory tiles are aligned. The arrow on the Z axis indicates the upward direction within the vertical direction. The X axis indicates the horizontal direction, i.e., the direction in which multiple refractory tiles are aligned. The Y axis indicates the direction perpendicular to the water tube panel, i.e., the thickness direction of the refractory tile. The arrow on the Y axis indicates the direction from the boiler water tube to the refractory tile installed on its top surface. In this example, the longitudinal direction is assumed to be the vertical direction, but it may be tilted relative to the vertical direction as long as it is a direction along the up-down direction. For example, in some places in a combustion furnace, the furnace wall may be tilted from the vertical. In that case, the following explanation can be understood by considering the system as an orthogonal coordinate system in which the X axis remains horizontal and the Z axis and Y axis are tilted. The embodiments are merely illustrative and are not intended to exclude various modifications or applications of techniques not explicitly described. Except for the essential components of the present invention, each component of the embodiments can be selected and modified as necessary.

[0014] First, the basics of the installation method (hereinafter referred to as the "installation method") of the refractory tiles for protecting boiler water tubes (hereinafter referred to as the "refractory tiles") according to the embodiment will be briefly explained using Fig. 1, and then examples of various refractory tiles used in the installation method will be explained using Fig. 2 to Fig. 16. Finally, the installation method will be explained in detail using Fig. 17.

[0015] [1.Basic matters] FIG. 1 is a schematic front view of a plurality of rectangular refractory tiles 2 aligned on the top surfaces of a plurality of boiler water tubes 1, as seen from inside a combustion furnace of a combustion plant equipped with a boiler. In Fig. 1, as an example, the fireproof tile 2 described in detail in [2. Types of Fireproof Tiles] below is arranged, but other types of fireproof tiles also described in detail in [2. Types of Fireproof Tiles] may be used instead of the fireproof tile 2. However, when using other types of fireproof tiles, the number of recesses 6 provided on one fireproof tile may be multiple, or the positions of the recesses 6 may differ from those of other types of fireproof tiles, so it is necessary to appropriately arrange the hooks 5 according to the number and positions of the recesses 6 of the fireproof tile. The water tube panel 4 is composed of a plurality of boiler water tubes 1, each erected in the Z-axis direction and spaced at equal intervals in the X-axis direction, and plate-like fins 3 that seamlessly connect two adjacent boiler water tubes 1 in the X-axis direction, i.e., in the horizontal direction. In other words, the water tube panel 4 is rectangular and has a structure in which a plurality of fins 3 fill the spaces between the aligned boiler water tubes 1. The furnace wall of a combustion furnace is generally rectangular tubular, and therefore a plurality of plate-shaped water tube panels 4 are welded together to form the rectangular tubular shape. However, for ease of explanation, the following description will be given using a water tube panel 4 on one side of the rectangular tubular shape. A plurality of hooks 5 are pre-welded to the fin 3 in a regular pattern at positions corresponding to the positions of the recesses formed on the rear surfaces of the plurality of refractory tiles to be aligned.

[0016] The rectangular refractory tiles are installed to cover the top surfaces of two or more boiler water tubes 1, are supported by hooks 5 in recesses 6 formed on the back surface, and can be arranged with a predetermined gap between two adjacent refractory tiles, and any structure is acceptable, not limited to the various refractory tile examples described below. Note that when a refractory tile is fixed to a water tube panel 4, the surface facing the inside of the furnace is called the "front surface" of the refractory tile, and the opposite side, i.e., the surface facing the boiler water tubes 1, is called the "back surface." The material of the refractory tile is preferably one whose main component is SiC, and in this case, the predetermined width is, for example, about 4 mm to 8 mm, more specifically, about 6 mm.

[0017] In Fig. 1, the refractory tile 2 has one recess 6 near the center of its back surface. However, like other types of refractory tiles described later, the refractory tile only needs to have at least one recess 6, and may have one or more recesses 6 arranged horizontally. The recess 6 is formed in a shape that allows the upper end of the refractory tile to be held horizontally when the refractory tile is hung on the L-shaped hook 5. 1, the hooks 5 are provided on every other fin 3 in the horizontal direction and are regularly arranged at equal intervals in the vertical direction of the fins 3. However, the hooks 5 may be arranged regularly as appropriate depending on the type of refractory tile, that is, depending on the number and positions of the recesses 6 provided on one refractory tile.

[0018] 1, as shown by the two-dot chain line, a plurality of tile sets each consisting of a predetermined number of refractory tiles are arranged to facilitate the allocation of work areas when multiple workers are working on the construction and to implement measures to prevent the refractory tiles from thermally expanding due to the heat inside the furnace when the combustion furnace is in operation. Specifically, as an example, tile set 7A, each set consisting of nine refractory tiles 2, three vertically and three horizontally, and tile set 7B, which has the same configuration as tile set 7A and is arranged next to tile set 7A, are shown. The arrangement of multiple fire-resistant tiles in one tile group is not limited to tile groups 7A and 7B, in which three fire-resistant tiles are arranged vertically and three fire-resistant tiles are arranged horizontally (hereinafter, a tile group with this arrangement will be referred to as the "first tile group"), but may also be tile groups in which two fire-resistant tiles are arranged vertically and two fire-resistant tiles are arranged horizontally (hereinafter, a tile group with this arrangement will be referred to as the "second tile group"), or tile groups in which three or more fire-resistant tiles are arranged vertically and two fire-resistant tiles are arranged horizontally (hereinafter, a tile group with this arrangement will be referred to as the "third tile group"). Furthermore, the arrangement of multiple fireproof tiles in one tile set may be two fireproof tiles arranged vertically and three or more fireproof tiles arranged horizontally (hereinafter, this tile set will be referred to as the "fourth tile set"), or they may be arranged in a row only vertically (hereinafter, this tile set will be referred to as the "fifth tile set"), or they may be arranged in a row only horizontally (hereinafter, this tile set will be referred to as the "sixth tile set"). A single water tube panel may have multiple tile sets of one type among the first to sixth tile sets arranged therein, or multiple types of tile sets may be arranged in a mixed manner depending on the furnace wall shape of the combustion furnace. The plurality of tile groups may be arranged vertically or horizontally. The number of refractory tiles included in each tile group may be changed depending on the location of the furnace wall. The same type of refractory tiles may be used for all tile groups, or different types of refractory tiles may be used for each tile group.

[0019] A fire-resistant joint material such as mortar or castable is applied to the gaps around each of the multiple fire-resistant tiles arranged in one tile set, and a fire-resistant expansion filler material such as fibercast is embedded in the gaps around each tile set. In FIG. 1, a fire-resistant expansion filler is filled in the gap between tile set 7A and the adjacent tile set 7B, and a fire-resistant joint material is applied to the gaps between the multiple fire-resistant tiles contained in tile set 7A and the gaps between the multiple fire-resistant tiles contained in tile set 7B.

[0020] [2. Types of fireproof tiles] Next, specific examples of the configuration of the types of refractory tiles to which the installation method of the present invention can be applied will be described. [Kamome-type fireproof tiles (non-fitting type)] 2(A) to 2(C) show the refractory tile 2 illustrated in Fig. 1. That is, this is a refractory tile 2 in which only one recess 6 is formed in the center in the X-axis direction and slightly above the center in the Z-axis direction on the back surface of one rectangular refractory tile 2, and which covers two boiler water tubes 1. When viewed in the XZ plane, the rectangular refractory tile 2 has a rectangular central portion 2A located in the center in the X-axis direction, and rectangular side portions 2B, each covering one boiler water tube 1, are arranged on both sides of the central portion 2A. That is, one side portion 2B is arranged on the right side of the central portion 2A, and another side portion 2B is arranged on the left side of the central portion 2A. When viewed in the XY plane, the side portions 2B are curved along approximately half of the outer periphery of the boiler water tube 1. The thickness of the curved portion is substantially the same everywhere and is thinner than the thickness of the central portion 2A. A recess 6 is formed in the central portion 2A. On the back surface of the refractory tile 2, a plurality of spacers 2C are formed on each side 2B, protruding toward the boiler water pipe 1. The spacers 2C have the function of strengthening the adhesive strength by uniformly leveling the thickness of the refractory joint material, such as mortar, applied to the back surface of the refractory tile 2, and also of making the heat transfer performance uniform. In Fig. 2, three spacers 2C are formed on one side 2B, but the number may be four or more or two or less. The fireproof tile 2 is called a "seagull-shaped" fireproof tile because, when viewed in the XY plane, the side portions 2B on both sides of the central portion 2A resemble the wings of a flying seagull.

[0021] [Kamome-type fireproof tiles (fitting type)] 3 to 5 are a type of "Kamome-type" refractory tile, similar to the refractory tile 2. The refractory tiles 8 to 10 differ from the refractory tile 2 only in that they are "fitting-type" refractory tiles, and therefore the same components as the refractory tile 2 are denoted by the same numbers and will not be described. The refractory tile 8 is a "fitting type first refractory tile" having both a fitting convex portion 8D and a fitting concave portion 8E, which will be described later, the refractory tile 9 is a "fitting type second refractory tile" having only the fitting convex portion 8D, which will be described later, and the refractory tile 10 is a "fitting type third refractory tile" having only the fitting concave portion 8E, which will be described later. The refractory tile 9 has the same shape as the refractory tile 8 except that the fitting concave portion 8E is not formed. The refractory tile 10 has the same shape as the refractory tile 8 except that the fitting convex portion 8D is not formed. The fitting protrusion 8D and the fitting recess 8E have shapes that allow them to fit together. Therefore, the fitting protrusion 8D of the refractory tile 8 can fit into the fitting recess 8E of the refractory tile 10, and the fitting recess 8E of the refractory tile 8 can fit into the fitting protrusion 8D of the refractory tile 9. Similarly, the fitting protrusion 8D of the refractory tile 9 can fit into the fitting recess 8E of the refractory tile 10.

[0022] When viewed on the XZ plane, the rectangular refractory tile 8 has a rectangular central portion 8A located in the center in the X-axis direction, and one rectangular side portion 2B covering one boiler water tube 1 is arranged on each side of the central portion 8A. That is, one side portion 2B is arranged on the right side of the central portion 8A, and one side portion 2B is arranged on the left side of the central portion 8A. Only one recess 6 is formed in the center of the central portion 8A in the X-axis direction and slightly above the center in the Z-axis direction. When viewed in the XZ plane, the central portion 8A is formed with a rectangular mating protrusion 8D that protrudes upward above the upper end of the side portion 2B, and a rectangular mating recess 8E that is recessed upward above the lower end of the side portion 2B and has dimensions that allow the mating protrusion 8D to fit into it.

[0023] When viewed on the XZ plane, the rectangular refractory tile 9 has a rectangular central portion 9A located in the center in the X-axis direction, and one rectangular side portion 2B covering one boiler water tube 1 is arranged on each side of the central portion 9A. That is, one side portion 2B is arranged on the right side of the central portion 9A, and another side portion 2B is arranged on the left side of the central portion 9A. Only one recess 6 is formed in the center of the central portion 9A in the X-axis direction and slightly above the center in the Z-axis direction. When viewed in the XZ plane, the central portion 9A is formed with a rectangular fitting protrusion 8D that protrudes upward from the upper end of the side portion 2B.

[0024] 5(A) to 5(E), when viewed on the XZ plane, the refractory tile 10 has a rectangular central portion 10A located in the center in the X-axis direction, and one rectangular side portion 2B covering one boiler water tube 1 is disposed on each side of the central portion 10A. That is, one side portion 2B is disposed on the right side of the central portion 10A, and another side portion 2B is disposed on the left side of the central portion 10A. Only one recess 6 is formed in the center of the central portion 10A in the X-axis direction and slightly above the center in the Z-axis direction. When viewed in the XZ plane, the central portion 10A is formed with a rectangular fitting recess 8E recessed upward from the lower end of the side portion 2B and having a size that allows the fitting protrusion 8D to be fitted therein.

[0025] 6 shows an example in which the refractory tile 2 in FIG. 1 is replaced with interlocking refractory tiles 8 to 10 and installed on the water pipe panel 4. As described above, the tile set 7A and the tile set 7B are both first tile sets in which three refractory tiles are installed vertically, and therefore the refractory tile 9, the refractory tile 8, and the refractory tile 10 can be arranged in this order from bottom to top in the Z-axis direction. Here, the fitting convex portion 8D of the refractory tile 8 fits into the fitting concave portion 8E of the refractory tile 10, and the fitting concave portion 8E of the refractory tile 8 fits into the fitting convex portion 8D of the refractory tile 9. When interlocking fireproof tiles are used for construction as shown in Figure 6, two adjacent fireproof tiles fit together vertically, making the structure more resistant to shaking from earthquakes and other events than when non-interlocking fireproof tiles 2 are used, and more effectively preventing the fireproof tiles from peeling off or falling.

[0026] As mentioned above, the number of refractory tiles included in one tile group may be changed as appropriate depending on the location on the furnace wall. Figure 7 shows an example of a third tile group in which a total of six refractory tiles are arranged, three vertically and two horizontally. Specifically, two rows are arranged in the X-axis direction, each row consisting of refractory tile 9, refractory tile 8, and refractory tile 10, arranged from bottom to top in the Z-axis direction. Each row is formed by fitting two adjacent refractory tiles vertically. Figure 7 also shows an example in which two such tile groups are arranged horizontally, namely, tile group 7A' and tile group 7B'. In Figures 6 and 7, the lower end of the tile set may be a refractory tile 9 and the upper end may be a refractory tile 10, and two or more refractory tiles 8 may be aligned vertically between the refractory tile 9 and the refractory tile 10, with two or more refractory tiles 8 being fitted together vertically. As another example, Fig. 8 shows a fourth tile set in which a total of six fireproof tiles are arranged, two vertically and three horizontally. Specifically, from bottom to top in the Z-axis direction, fireproof tile 9 and fireproof tile 10 are arranged in this order, and two adjacent fireproof tiles are fitted together to form a row. These rows are then arranged in three rows in the X-axis direction to form one tile set. Fig. 8 also shows an example in which two such tile sets are arranged horizontally, namely, tile set 7A'' and tile set 7B''.

[0027] [Kamome-type fireproof tiles (fitting and half-split type)] The refractory tiles 11 to 13 shown in Figures 9 to 11 differ from the interlocking type refractory tiles 8 to 10 shown in Figures 3 to 5 only in that one side 2B of the interlocking type refractory tiles 8 to 10 shown in Figures 3 to 5 is a half-shaped tile split along the Z axis near its center, and therefore the same components as the refractory tiles 8 to 10 are numbered the same and will not be described. The interlocking and split refractory tiles 11, 12, and 13 shown in Figures 9(A), 10(A), and 11(A) have a configuration in which, when viewed from the surface of the refractory tile, one side portion 2B is arranged on the right side of the central portions 8A, 9A, and 10A, and one split side portion 11F is arranged on the left side of the central portions 8A, 9A, and 10A, and are called "first half-type" refractory tiles. On the other hand, a refractory tile having a shape symmetrical to the first half-type refractory tile is called a "second half-type" refractory tile. The half-split side portion 11F has a structure in which the side portion 2B is split along the Z axis, making the side portion 2B smaller in the horizontal direction, and has a curved shape that follows approximately 1 / 4 of the circumference of the boiler water tube 1 when viewed in the XY plane.

[0028] As the first half-type refractory tiles, here are shown refractory tile 11 in FIG. 9 (a first half-type refractory tile similar to the interlocking first refractory tile) which differs from refractory tile 8 in FIG. 3 only in the half-broken side portion 11F, refractory tile 12 in FIG. 10 (a first half-type refractory tile similar to the interlocking second refractory tile) which differs from refractory tile 9 in FIG. 4 only in the half-broken side portion 11F, and refractory tile 13 in FIG. 11 (a first half-type refractory tile similar to the interlocking third refractory tile) which differs from refractory tile 10 in FIG. 5 only in the half-broken side portion 11F. The second half-type refractory tiles are shown in Figure 12 as refractory tile 14 (second half-type refractory tile similar to the interlocking first refractory tile) which has a shape symmetrical to refractory tile 11, refractory tile 15 (second half-type refractory tile similar to the interlocking second refractory tile) which has a shape symmetrical to refractory tile 12, and refractory tile 16 (second half-type refractory tile similar to the interlocking third refractory tile) which has a shape symmetrical to refractory tile 13, but unlike the first half-type refractory tiles, they are not individually shown in the figures.

[0029] As shown in Fig. 9(A), the first half-shaped refractory tile 11 has a structure in which, when viewed from the surface, the left side 2B of the central part 8A of the interlocking-type refractory tile 8 shown in Fig. 3 is replaced with a half-split side part 11F. Therefore, like the interlocking-type refractory tile 8, the central part 8A of the first half-shaped refractory tile 11 is provided with an interlocking convex part 8D above it and an interlocking concave part 8E below it. As shown in Fig. 10(A), the first half-shaped refractory tile 12 has a structure in which, when viewed from the surface, the left side 2B of the central portion 9A of the interlocking-type refractory tile 9 shown in Fig. 4 is replaced with a half-split side portion 11F. Therefore, like the interlocking-type refractory tile 9, the central portion 9A of the first half-shaped refractory tile 12 is provided with an interlocking protrusion 8D above it. 11(A), the first half-shaped refractory tile 13 has a structure in which, when viewed from the surface, the left side 2B of the central part 10A of the interlocking-type refractory tile 10 shown in Fig. 5 is replaced with a half-split side part 11F. Therefore, like the interlocking-type refractory tile 10, the central part 10A of the first half-shaped refractory tile 13 has an interlocking recess 8E below it.

[0030] On the other hand, although not individually shown, the second half-type refractory tile 14 has a structure in which, when viewed from the surface, the right side 2B of the central portion 8A of the interlocking type refractory tile 8 shown in Fig. 3 is replaced with a half-split side portion 11F. Therefore, the central portion 8A of the second half-type refractory tile 14 is provided with an interlocking protrusion 8D above it and an interlocking recess 8E below it. Further, the second half-shaped refractory tile 15 has a structure in which the right side 2B of the central portion 9A of the fitting-type refractory tile 9 shown in Fig. 4 is replaced with a half-split side portion 11F when viewed from the surface. Therefore, the central portion 9A of the second half-shaped refractory tile 15 is provided with a fitting protrusion 8D above it. Furthermore, the second half-shaped refractory tile 16 has a structure in which the right side 2B of the central portion 10A of the fitting-type refractory tile 10 shown in Fig. 5 is replaced with a half-split side portion 11F when viewed from the surface. Therefore, the central portion 10A of the second half-shaped refractory tile 16 is provided with a fitting recess 8E below it.

[0031] The first half-type refractory tile and the second half-type refractory tile can be arranged with their respective half sides 11F facing each other, as shown in Figure 12, to cover three boiler water tubes 1. As mentioned above, a plurality of hooks 5 are pre-installed on the fins 3 at positions corresponding to the positions of the recesses formed on the backsides of a plurality of refractory tiles to be aligned. When half-split refractory tiles are used, unlike the water tube panel 4 shown in Fig. 1, the hooks 5 are installed on two adjacent fins 3 sandwiching one boiler water tube 1 of the water tube panel 4', and are installed regularly at equal intervals in the vertical direction of the fins 3. 12 shows an example in which a first row 18 is formed by fitting two vertically adjacent first half-type refractory tiles together in the order of refractory tile 12, refractory tile 11, and refractory tile 13 from bottom to top in the Z-axis direction, and a second row 19 is formed by fitting two vertically adjacent second half-type refractory tiles together in the order of refractory tile 15, refractory tile 14, and refractory tile 16 to the right of the first row 18, and the first row 18 and the second row 19 form one tile set 17. Tile set 17 is a third tile set. Here, a configuration in which vertically adjacent refractory tiles are fitted together is shown, but the refractory tiles may be split into halves that do not have the fitting convex portion 8D and the fitting concave portion 8E.

[0032] [Block-type fireproof tiles] Fig. 13 shows an example of the configuration of a block-type refractory tile 20. The refractory tile 20 differs from the gull-type refractory tile 2 in Fig. 2 only in that the surface of the refractory tile 20 is formed as a flat surface, and therefore, the same components as those of the refractory tile 2 are assigned the same numbers and will not be described. The surfaces of the central portion 2A, the side portion 2B to the right of the central portion 2A, and the side portion 2B to the left of the central portion 2A are all at the same position in the Y-axis direction, i.e., in the thickness direction, of the refractory tile 20. Therefore, the refractory tile 20 can be formed by cutting out two U-shaped grooves 20A that cover two boiler water tubes 1 and recesses 6 for receiving hooks 5 from a single square pillar-shaped refractory tile raw material and firing the cutout. The block-type refractory tile 20 is heavier than the gull-type refractory tile because the side portion 2B is thicker, but depending on the design, it can be used for the furnace wall. 14 shows an example of the configuration of a refractory tile 21, which is a modified example of the block-type refractory tile 20. Unlike the block-type refractory tile 20, the block-type refractory tile 21 does not have two U-shaped grooves 20A that cover two boiler water tubes 1. Therefore, the refractory tile 21 can be formed by cutting out only the recess 6 for hanging the hook 5 from a raw material for the refractory tile formed into a single square pillar shape and firing the tile. The block-type refractory tile 21 has the advantage of being easier to manufacture than the block-type refractory tile 20, and like the refractory tile 20, it can be used for the furnace wall depending on the design.

[0033] [Large fireproof tiles] As mentioned above, among multiple tile sets, one tile set may be composed of multiple fireproof tiles of a specific type, while another tile set may be composed of a different type of fireproof tiles from the specific type. Figure 15 shows tile set 7B, which is a first tile set in which a total of nine fireproof tiles 2 are arranged, three vertically and three horizontally, and tile set 7A''', which is a fifth tile set in which three large fireproof tiles 23 are arranged in a row only vertically. Typically, one side of a furnace wall of a combustion furnace is formed by welding together multiple rectangular water tube panels. The welded portion between two adjacent water tube panels leaves a linear mark called a weld line. Because the weld line is uneven, it may not be possible to attach hook 5 to the fin where the weld line is located. On the other hand, depending on the size and design of the combustion furnace, when refractory tiles 2 are installed horizontally on one water tube panel, it may not be possible to cover one boiler water tube 1 at the end of the water tube panel with the refractory tile 2. FIG. 15 shows this state. In FIG. 5, one water tube panel 4'' is placed on each side. In the water tube panel 4'', like the water tube panel 4 in FIG. 1, multiple hooks 5 are attached to every other fin 3 in the horizontal direction, and are regularly attached at equal intervals in the vertical direction of the fins 3. However, in FIG. 15, the left end of the right water tube panel 4'' and the right end of the left water tube panel 4'' are welded to each other, so that if only the refractory tile 2 is to be installed, a weld line 26 is formed on the fin 3 where the hook 5 should be attached, and the hook 5 cannot be attached properly. Therefore, a large refractory tile 23 is used that can straddle the weld line 26 and simultaneously cover the boiler water tubes 1 of these two water tube panels 4''.

[0034] The large refractory tile is rectangular, has two or more recesses 6 formed therein, and can cover three or more boiler water tubes 1 . The large refractory tile 23 shown as an example in Figure 15 has a structure in which three refractory tiles 2 are connected together in the horizontal direction. However, in the refractory tile 23, the recesses 6 located at the weld lines 26 are not formed because they are unnecessary. Therefore, in Figure 15, the refractory tile 23 has a total of two recesses 6: one recess 6 that can be hooked onto the hook 5 installed on the water pipe panel 4'' on the left side, and the other recess 6 that can be hooked onto the hook 5 installed on the water pipe panel 4'' on the right side. Here, the large refractory tile 23 has been described as having a structure in which three refractory tiles 2 are connected together in the horizontal direction, but the large refractory tile is not limited to this and may be a large refractory tile having a structure in which four or more refractory tiles are connected together in the horizontal direction. Furthermore, the large refractory tile is not limited to a structure in which a plurality of refractory tiles 2 are connected together in the horizontal direction, and may be, for example, a structure in which a plurality of interlocking refractory tiles 8 are connected together in the horizontal direction, or a structure in which a plurality of block-type refractory tiles 20, 21 are connected together in the horizontal direction. Even in places where there are weld lines 26, which have traditionally been addressed by applying fire-resistant joint material, large fire-resistant tiles can be installed across the weld lines 26, thereby providing stronger protection for the boiler water tubes 1 of the water tube panel 4''.

[0035] Note that large refractory tiles are not limited to being installed only at locations spanning the weld lines 26, and may be installed within one water tube panel. As described above, the large refractory tile is rectangular, has two or more recesses 6 formed therein, and may cover three or more boiler water tubes 1. Therefore, as shown in Fig. 16, a refractory tile 28 may be formed integrally by connecting a first half refractory tile and a second half refractory tile adjacent to each other on the left and right in Fig. 12. Figure 16 shows an example of a fifth tile set in which large refractory tile 28B, which is configured by connecting refractory tile 12 and refractory tile 15 in Figure 12, large refractory tile 28A, which is configured by connecting refractory tile 11 and refractory tile 14 in Figure 12, and large refractory tile 28C, which is configured by connecting refractory tile 13 and refractory tile 16 in Figure 12, are installed in a row in this order from bottom to top in the Z-axis direction. The two mating protrusions 8D on the large refractory tile 28A are fitted into the two mating recesses 8E on the large refractory tile 28C, and the two mating recesses 8E on the large refractory tile 28A are fitted into the two mating protrusions 8D on the large refractory tile 28B. 16 shows the interlocking large refractory tiles 28A, 28B, and 28C. However, the present invention is not limited to this, and one type of non-interlocking large refractory tile may be used without forming the interlocking convex portion 8D and the interlocking concave portion 8E.

[0036] [3. Construction method] The above describes examples of rectangular refractory tiles to which the installation method of the present invention can be applied. The construction method of the present invention using these refractory tiles will now be described. For ease of explanation, the following will be explained using an example of installing fireproof tile 2, which is a "Kamome-type fireproof tile," out of the multiple types of fireproof tiles mentioned above, namely, "Kamome-type fireproof tile (non-interlocking type)," "Kamome-type fireproof tile (interlocking type)," "Kamome-type fireproof tile (interlocking type and half-split type)," "Block-type fireproof tile," and "Large fireproof tile." However, if the hooks 5 are fixed to the fins 3 in a regular arrangement corresponding to the number and positions of the recesses formed on the back surface of the fireproof tiles to be aligned in the water pipe panel, the installation method of the present invention can be applied not only to the "Kamome type fireproof tiles (non-interlocking type)", but also to any of the fireproof tiles such as "Kamome type fireproof tiles (interlocking type)", "Kamome type fireproof tiles (interlocking and half type)", "block type fireproof tiles", and "large fireproof tiles".

[0037] 17, the refractory tiles 2 shown in FIG. 1 are numbered 2-1, 2-2, 2-3, ..., 2-18. These numbers will be used in the following description to indicate the order in which the refractory tiles 2 are installed. In Figure 17, tile set 7A and tile set 7B are the first tile sets, so three rows of fireproof tiles 2 are arranged horizontally, that is, from bottom to top, in the order of bottom row, center row, and top row. Also, tile set 7A and tile set 7B, which are the first tile sets, are arranged next to each other horizontally, so a total of six rows of fireproof tiles 2 are arranged: three columns of tile set 7A and three columns of tile set 7B. Therefore, a total of (3 x (3 + 3)) = 18 fireproof tiles 2 are installed, including tile set 7A and tile set 7B. Therefore, the six fireproof tiles 2 arranged in the bottom row are numbered from left to right as 2-1, 2-2, 2-3, 2-4, 2-5, and 2-6, the six fireproof tiles 2 arranged in the middle row are numbered from left to right as 2-7, 2-8, 2-9, 2-10, 2-11, and 2-12, and the six fireproof tiles 2 arranged in the top row are numbered from left to right as 2-13, 2-14, 2-15, 2-16, 2-17, and 2-18. The hooks 5 were also numbered corresponding to the numbers of the fireproof tiles 2. That is, the six hooks 5 arranged in the bottom row were numbered 5-1, 5-2, 5-3, 5-4, 5-5, and 5-6 from left to right, the six hooks 5 arranged in the middle row were numbered 5-7, 5-8, 5-9, 5-10, 5-11, and 5-12 from left to right, and the six hooks 5 arranged in the top row were numbered 5-13, 5-14, 5-15, 5-16, 5-17, and 5-18 from left to right.

[0038] Now, let us begin the explanation of the construction method. In the water pipe panel 4 shown in Figure 17, multiple hooks 5 are fixed regularly by welding or the like to every other fin 3 in the horizontal direction. The explanation will start from the state where not a single refractory tile 2 has been placed yet. (1) First step The worker will proceed with the discussion assuming that he is in charge of installing fireproof tiles 2 in tile set 7A and tile set 7B. In the first step, one of the plurality of fireproof tiles is used as a reference tile, and without applying fireproof joint material to its back surface, it is placed by being hooked onto a number of reference hooks corresponding to the number of recesses formed on the back surface of the reference tile. Therefore, the worker first selects a reference tile from among the fireproof tiles 2 to be installed. In consideration of ease of installation, it is desirable to start installation from the fireproof tile 2 that is to be located at the bottom row and the horizontal end of the tile set. Here, we will proceed assuming that the worker first selects the fireproof tile 2-1, which is to be located at the left end of the bottom row of the tile set 7A, as the reference tile. Although we will proceed assuming that the fireproof tile 2-1 is the reference tile, the worker may select any fireproof tile 2 at his / her discretion as the reference tile.

[0039] Since the fireproof tile 2-1 has only one recess 6, the reference hooks corresponding to the number of recesses 6 are only hooks 5-1. If the tile has multiple recesses 6, such as a "large fireproof tile," the reference hooks will be the horizontal hooks 5 corresponding to the number of recesses 6. Therefore, the number of reference hooks may be singular or plural.

[0040] The worker hooks the recess 6 on the back surface of the fireproof tile 2-1 selected as the reference tile onto the hook 5-1, which is the reference hook, without applying any fireproof joint material such as mortar to the back surface of the fireproof tile 2-1. Since the fireproof tile 2-1 is simply hooked onto the hook 5-1 without applying any fireproof joint material to the back surface of the fireproof tile 2-1, gravity naturally allows the tip of the L-shaped hook 5-1 to enter as far into the recess 6 as possible. In other words, it can reach the highest point in the recess 6 as possible. Then, the upper end of the refractory tile 2-1 is aligned horizontally. The position of the upper end aligned in this way and the positions of the side ends at this time become the reference positions for the row and column in which the reference tile is arranged. Here, the position of the upper end of the refractory tile 2-1 becomes the designed position relative to the upper ends of each of the plurality of refractory tiles 2 arranged in the bottom row. Also, the positions of the side ends of the refractory tile 2-1 become the designed positions relative to the side ends of each of the plurality of refractory tiles 2 arranged in the column above and below the refractory tile 2-1.

[0041] (2)Second process In the second step, after the first step, a fire-resistant joint material is applied to the back surface of one of the plurality of fire-resistant tiles that is different from the reference tile, and the fire-resistant tile coated with the fire-resistant joint material is hung on a number of hooks corresponding to the number of recesses, including the hook immediately adjacent to the reference hook, among the plurality of hooks.Then, while aligning it with the reference tile, the fire-resistant tile coated with the fire-resistant joint material is pressed against the water pipe panel to fix it in place. Therefore, the worker first selects the refractory tile 2 to be fixed by applying fireproof joint material from among the refractory tiles 2 adjacent to the reference tile 2-1 in the vertical and horizontal directions. In this case, since the reference tile is the refractory tile 2-1, the candidate refractory tile 2 to be fixed is either the refractory tile 2-7, which is to be located immediately above the refractory tile 2-1, or the refractory tile 2-2, which is to be located immediately to the right of the refractory tile 2-1. When a worker selects a refractory tile 2-2 as the refractory tile 2 to be fixed, the worker applies a refractory joint material such as mortar to the backside of the refractory tile 2-2, and hooks the only recess 6 that the refractory tile 2-2 has onto hooks 5-2, which are "hooks in the number corresponding to the number of recesses, including the hook immediately adjacent to the reference hook 5-1." In this case, since the refractory tile 2 has only one recess 6, the number of hooks 5 corresponding to the recess 6 is also one, but if the refractory tile had multiple recesses 6, the number of hooks 5 corresponding to the recess 6 would also be multiple, as described above. Since the recesses 6 of the refractory tile 2-2 are filled with refractory joint material, the refractory tile 2-2 is aligned so that its upper end coincides with the upper end of the refractory tile 2-1, which is the reference tile, and while the refractory tile 2-2 is vibrated up and down in the lengthwise direction of the boiler water tube 1 so that the thickness of the refractory joint material is uniform to a predetermined thickness of about 10 to 20 mm, the refractory tile 2-2 is pressed and fixed toward the water tube panel 4. At this time, the horizontal dimension of the recesses 6 of the refractory tile 2 is substantially the same as the horizontal dimension of the tip of the L-shaped hook 5, so the positions of the side edges of the fixed refractory tile 2-2 naturally coincide with the designed positions. Since the positions of the top end and side end of the refractory tile 2-2 fixed in this manner coincide with the designed position, the refractory tile 2-2 can be treated as a new reference tile for aligning the refractory tiles 2 to be installed in subsequent processes to the designed position. As mentioned above, the spacers 2C are arranged on the back surface of the refractory tiles 2, so that the refractory joint material can be made to a predetermined thickness simply by pressing the refractory tiles 2-2 toward the water pipe panel.

[0042] When the worker selects the fireproof tile 2-7 as the fireproof tile 2 to be fixed, the worker applies a fireproof joint material such as mortar to the backside of the fireproof tile 2-7, and hooks the recess 6, of which the fireproof tile 2-7 has only one, onto the hook 5-7, which is "a number of hooks corresponding to the number of recesses, including the hook immediately adjacent to the reference hook 5-1." If the fireproof tile has multiple recesses 6, then as mentioned above, there will also be multiple hooks 5 corresponding to the number of recesses 6. Since the recesses 6 of the refractory tile 2-7 are filled with refractory joint material, the refractory tile 2-7 is positioned so that the side edges thereof coincide with the side edges of the refractory tile 2-1, which is the reference tile. However, even if only the side edges are aligned, it is difficult to position the top edges of the refractory tiles arranged in a vertical row of the reference tile in the designed position. Therefore, we take advantage of the fact that two refractory tiles adjacent to each other in the vertical and horizontal directions are designed to have a specified gap between them. That is, when aligning the side end of the refractory tile 2-7 so that it coincides with the side end of the refractory tile 2-1, which is the reference tile, the distance between the upper end of the refractory tile 2-1 and the lower end of the refractory tile 2-7 is measured to ensure that it is the specified width, and the refractory tile 2-7 is vibrated up and down in the longitudinal direction of the boiler water tube 1 while pressing the refractory tile 2-7 against the water tube panel 4 to fix it. Since the positions of the upper and lower ends and the side ends of the refractory tile 2-7 fixed in this manner coincide with the designed positions, the refractory tile 2-7 can be treated as a new reference tile for aligning the refractory tiles 2 to be installed in subsequent processes to the designed positions. In addition, since the refractory tiles 2 fixed in the subsequent steps are all fixed in the designed positions, they can all be treated as new reference tiles.

[0043] (3) Third step In the third step, after the second step, either the first branching step or the second branching step described below is carried out. The first branching step is carried out only once throughout the entire process. (3-1) First branching process In the first branching step, the reference tile is removed from the reference hook, a fire-resistant joint material is applied to the back surface of the tile, and the reference tile is then hooked onto the reference hook. After that, the reference tile is aligned with the fire-resistant tile fixed in the second step and pressed toward the water pipe panel to fix it. Therefore, the worker first removes the reference tile, the fireproof tile 2-1, from the reference hook, the hook 5-1. The fireproof tile 2-1 can be easily removed because it is simply hooked onto the hook 5-1 without being coated with a fireproof joint material, which is an adhesive. Then, after applying a fireproof joint material to the back surface of the fireproof tile 2-1, the recess 6 of the fireproof tile 2-1 is hooked onto the hook 5-1 again, and the fireproof tile 2-2 or the fireproof tile 2-7 that has already been fixed in the designed position is treated as a new reference tile, and the fireproof tile 2-1 is pressed against the water pipe panel 4 and fixed while aligning it with the fireproof tile 2-2 or the fireproof tile 2-7. Specifically, the refractory tile 2-1 is fixed to the water pipe panel 4 as follows.

[0044] When the refractory tile 2-2 immediately to the right of the refractory tile 2-1 is fixed, the refractory tile 2-1 is aligned so that its upper end coincides with the upper end of the refractory tile 2-2, which is the new reference tile, and while the refractory tile 2-1 is vibrated up and down in the longitudinal direction of the boiler water tube 1, the refractory tile 2-1 is pressed and fixed toward the water tube panel 4. The positions of the upper end and side ends of the refractory tile 2-1 fixed in this way coincide with the designed positions. The fireproof tile 2-1 was originally a reference tile, but by being fixed to the water pipe panel 4 in the first branching process, it can be treated as a new reference tile for aligning the fireproof tiles 2 to be installed in subsequent processes to their designed positions.

[0045] When the refractory tile 2-7 located immediately above the refractory tile 2-1 is fixed, the position of the side edge of the refractory tile 2-1 is aligned with the position of the side edge of the refractory tile 2-7, which is the new reference tile, and the distance between the bottom edge of the refractory tile 2-7 and the top edge of the refractory tile 2-1 is measured to be the predetermined width, and the refractory tile 2-1 is vibrated up and down in the length direction of the boiler water tube 1 while pressing and fixing the refractory tile 2-1 against the water tube panel 4. The positions of the top edge and side edges of the refractory tile 2-1 fixed in this way will match the designed positions. The fireproof tile 2-1 was originally a reference tile, but by being fixed to the water pipe panel 4 in the first branching process, it can be treated as a new reference tile for aligning the fireproof tiles 2 to be installed in subsequent processes to their designed positions.

[0046] (3-2) Second branching process In the second branching step, a fireproof joint material is applied to the back surface of one of the plurality of fireproof tiles that is different from the fireproof tiles fixed in all of the steps preceding this step, and the fireproof tile coated with the fireproof joint material is hung on a number of hooks corresponding to the number of recesses, including the hook immediately adjacent to the hook that hung the fireproof tile fixed in the step immediately preceding this step or the step two steps before this step, and on which no fireproof tile has yet been hung, and the fireproof tile coated with the fireproof joint material is then pressed against the water pipe panel to be fixed while aligning it with the fireproof tile fixed in the step immediately preceding this step or the step two steps before this step. Therefore, the worker first selects one refractory tile 2 that is different from the refractory tiles 2 fixed in all previous steps of this step. As will be described later, in the fourth step that is performed after the third step, the third step is performed repeatedly, so when the second branch step of the third step is performed for the first time, the first branch step of the third step may have already been performed. Therefore, when the second branching step is carried out for the first time, the "refractory tile 2 fixed in all previous steps of this step" can be either (A) the refractory tile 2-2 fixed in the second step, or (B) the refractory tile 2-2 fixed in the second step and the refractory tile 2-1 fixed in the first branching step. However, in the case of (A), the refractory tile 2-1 is not fixed but remains hooked on the hook 5-1. In this process, i.e., the second branching process, the above-mentioned "one different refractory tile" is hooked onto "a hook that has not yet been hooked onto any refractory tile," so in view of (A) and (B), refractory tile 2-1 and refractory tile 2-2 are excluded from the target of the above-mentioned "one different refractory tile 2." However, since "the refractory tile is aligned with the refractory tile fixed in the step immediately preceding this step or the step two steps before this step," ultimately, when the second branching step is performed for the first time, the "different refractory tile" in the case of (A) will be either the refractory tile 2-3 located immediately to the right of the refractory tile 2-2, or the refractory tile 2-8 located immediately above the refractory tile 2-2. Also, in the case of (B), the "different refractory tile" when the second branching step is performed for the first time will be either the two refractory tiles in the case of (A), namely, the refractory tile 2-3 and the refractory tile 2-8, or the refractory tile 2-7 located immediately above the fixed refractory tile 2-1. In the construction method of the present invention, the positions of the upper and lower ends and the side ends of the "fixed refractory tiles" coincide with the designed positions, so all "fixed refractory tiles" can be treated as the new reference tiles. Therefore, not only the refractory tiles fixed in the "step immediately before this step," but also the refractory tiles fixed in the "step two steps before this step" can be treated as new reference tiles.

[0047] In the cases (A) and (B), if the worker selects the fireproof tile 2-3 as the "different fireproof tile," the worker applies a fireproof joint material such as mortar that acts as an adhesive to the back surface of the fireproof tile 2-3, and hooks the only recess 6 that the fireproof tile 2-3 has onto hook 5-3, which is "a hook that is not yet hooked to any fireproof tile, including the hook immediately adjacent to the hook that hooked the fixed fireproof tile, and the number of hooks corresponds to the number of recesses." Then, the fixed refractory tile 2-2 is treated as a new reference tile, and the position of the upper end of the refractory tile 2-3 is aligned with the position of the upper end of the refractory tile 2-2, and while the refractory tile 2-3 is vibrated up and down in the longitudinal direction of the boiler water tube 1, the refractory tile 2-3 is pressed against the water tube panel 4 and fixed. Since the positions of the top and side edges of the refractory tile 2-3 fixed in this manner coincide with the designed positions, the refractory tile 2-3 can be treated as a new reference tile for aligning the refractory tiles 2 to be installed in subsequent processes to the designed positions.

[0048] In the cases (A) and (B), if the worker selects the fireproof tile 2-8 as the "different fireproof tile," the worker applies a fireproof joint material such as mortar that acts as an adhesive to the back surface of the fireproof tile 2-8, and hooks the only recess 6 that the fireproof tile 2-8 has onto hook 5-8, which is "the hook that is one next to the hook that hooked the fixed fireproof tile, and the number of hooks that does not yet have any fireproof tile hooked on it corresponds to the number of recesses." Then, the fixed refractory tile 2-2 is treated as a new reference tile, and the position of the side end of the refractory tile 2-8 is aligned with the position of the side end of the refractory tile 2-2. At the same time, the distance between the upper end of the refractory tile 2-2 and the lower end of the refractory tile 2-8 is measured to ensure that it is the above-mentioned specified width, and the refractory tile 2-8 is pressed against the water tube panel 4 and fixed while vibrating up and down in the longitudinal direction of the boiler water tube 1. Since the positions of the upper and lower ends and the side ends of the refractory tile 2-8 fixed in this manner coincide with the designed positions, the refractory tile 2-8 can be treated as a new reference tile for aligning the refractory tiles 2 to be installed in subsequent steps to the designed positions.

[0049] In the case of (B), if the worker selects the fireproof tile 2-7 as the "different fireproof tile," the worker applies a fireproof joint material such as mortar to the back of the fireproof tile 2-7, which acts as an adhesive, and hooks the only recess 6 that the fireproof tile 2-7 has onto hook 5-7, which is "a hook that is not yet hooked to any fireproof tile, including the hook immediately adjacent to the hook that hooked the fixed fireproof tile, and the number of hooks corresponds to the number of recesses." The fixed refractory tile 2-1 was also the reference tile before being fixed, but is treated as a new reference tile, and when the position of the side end of the refractory tile 2-1 is aligned with the position of the side end of the refractory tile 2-7, the distance between the upper end of the refractory tile 2-1 and the lower end of the refractory tile 2-7 is measured to be the above-mentioned specified width, and the refractory tile 2-7 is pressed against the water tube panel 4 and fixed while vibrating up and down in the longitudinal direction of the boiler water tube 1. Since the positions of the upper and lower ends and the side ends of the refractory tile 2-7 fixed in this manner coincide with the designed positions, the refractory tile 2-7 can be treated as a new reference tile for aligning the refractory tiles 2 to be installed in subsequent steps to the designed positions.

[0050] (4) Fourth step In the fourth step, after the third step is performed for the first time, the third step is repeatedly performed a predetermined number of times. Here, the predetermined number of times can be determined arbitrarily by the worker. That is, the construction method of the present invention may be performed multiple times for one tile set. However, from the viewpoint of improving construction speed, the predetermined number of times is generally the number of times until all the fireproof tiles included in at least one tile set are installed. In other words, it is desirable to perform the construction method of the present invention for one or more tile sets. When a worker is in charge of multiple adjacent tile sets, if the types of fire-resistant tiles contained in these tile sets are the same, each tile set can be considered to be one tile set, and the specified number of times can be the number of times until all the fire-resistant tiles contained in the tile set considered to be one have been installed. The predetermined number of times is the number of times the third process is repeatedly performed after the third process is performed once, so the predetermined number of times is the total number of third processes performed minus 1.

[0051] For example, when installing refractory tiles 2 in units of tile group 7A, in the case of (A) above, refractory tile 2-2 of tile group 7A fixed in the process immediately preceding the first third process is treated as a new reference tile, refractory tile 2-3 is fixed in the second branch process (first time) of the third process, refractory tile 2-9 is fixed in the second branch process (second time) of the third process using the fixed refractory tile 2-3 as the new reference tile, refractory tile 2-8 is fixed in the second branch process (third time) of the third process using the fixed refractory tile 2-9 as the new reference tile, and so on. Subsequently, similarly, refractory tile 2-7 is fixed in the second branch process (fourth time) of the third process, refractory tile 2-13 is fixed in the second branch process (fifth time) of the third process, refractory tile 2-14 is fixed in the second branch process (sixth time) of the third process, and refractory tile 2-15 is fixed in the second branch process (seventh time) of the third process. Finally, by fixing the refractory tiles 2-1 in the first branch step of the third step (the first time, but the eighth time as the third step), all the refractory tiles 2 included in the tile set 7A can be installed. Therefore, in this case, the predetermined number of times is (8-1)=7 times.

[0052] In addition, since the refractory tiles contained in adjacent tile sets 7A and 7B in Figure 17 are the same type of refractory tiles 2, when the tile sets 7A and 7B are regarded as one tile set and the installation of the refractory tiles 2 is carried out, and in the case of (B) above, since the first branch step of the third step has already been carried out once, only the second branch step of the third step will be carried out repeatedly. In this case, for example, as in the example of the tile set 7A unit described above, the fireproof tile 2-2 of the tile set 7A fixed in the immediately preceding process is treated as a new reference tile, and the fireproof tile 2-3 is fixed in the second branch process (first time) of the third process, the fireproof tile 2-4 of the tile set 7B is fixed in the second branch process (second time) of the third process, the fireproof tile 2-5 is fixed in the second branch process (third time) of the third process, the fireproof tile 2-6 is fixed in the second branch process (fourth time) of the third process, the fireproof tile 2-12 is fixed in the second branch process (fifth time) of the third process, the fireproof tile 2-11 is fixed in the second branch process (sixth time) of the third process, the fireproof tile 2-10 is fixed in the second branch process (seventh time) of the third process, and the fireproof tile 2-9 of the tile set 7A is fixed in the second branch process (eighth time) of the third process, and so on. In this way, the fireproof tiles 2 can be installed sequentially across two tile sets, from the lower row to the upper row. Then, once all the fireproof tiles 2 in a row have been laid, all the fireproof tiles 2 in the row above that are laid, and so on. By carrying out the second branch process of the third process a total of 16 times, the fireproof tile 2-18 of tile set 7B can be fixed by the second branch process of the third process (the 16th time, but the 17th time as the third process). This allows all the fireproof tiles 2 contained in tile set 7A and tile set 7B to be laid. In this case, the predetermined number of times is (17 - 1) = 16.

[0053] (5) Post-processing After the fireproof tiles included in all the tile groups that the worker is responsible for have been fixed, as mentioned above, the worker fills the gaps between two adjacent fireproof tiles in one tile group with fireproof joint material such as mortar or castable. In addition, the worker fills the gaps between two adjacent tile groups with fireproof expansion filler material such as fibercast. 17, a fireproof joint material is applied between two adjacent fireproof tiles 2 in tile group 7A, and a fireproof joint material is applied between two adjacent fireproof tiles 2 in tile group 7B. Then, a fireproof expansion allowance filler is embedded between tile group 7A and tile group 7B, around tile group 7A, and around tile group 7B. This improves the protection performance of the boiler water tubes 1, and prevents cracks and falling off of the refractory tiles 2 due to thermal expansion, thereby extending the life of the combustion furnace.

[0054] As described above, according to the construction method of the invention, in the second step, the fireproof tile is aligned using the reference tile that was simply hooked onto a hook in the first step, and then fixed to the water pipe panel; in the third step, the fireproof tile fixed in the second step is treated as a new reference tile and aligned, and then another fireproof tile is fixed to the water pipe panel; and in the fourth step, the third step is repeated a predetermined number of times. That is, by sequentially changing the refractory tile that serves as the reference for alignment, alignment can be easily and accurately performed, and a plurality of refractory tiles can be installed at predetermined positions. [Explanation of symbols]

[0055] 1. Boiler water tubes 2, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 21, 23, 28 Refractory tiles 2A, 8A, 9A, 10A central part 2B Side 2C spacer 3 Fins 4, 4', 4' water tube panel 5 Hooks 6 recess 7A, 7B, 7A′, 7B′, 7A′′, 7B′′, 7A′′′ Tile set 8D mating protrusion 8E Mating recess 18 First row 19 Second row 20A U-shaped groove 26 Welding Line

Claims

1. a water tube panel including a plurality of boiler water tubes uniformly arranged in the horizontal direction, a plurality of fins connecting two adjacent boiler water tubes in the horizontal direction, and a plurality of hooks provided on the plurality of fins, for aligning and fixing a plurality of rectangular refractory tiles to the water tube panel; the plurality of hooks being fixed to the plurality of fins in a regular arrangement corresponding to the positions of recesses formed on the back surfaces of the aligned refractory tiles; In a method for installing refractory tiles for protecting boiler water tubes, a refractory joint material is applied to the back surface of the refractory tile, and the recesses are hooked and fixed by the hooks, the number of which corresponds to the number of the recesses, so that the plurality of refractory tiles are aligned and arranged at predetermined intervals from each other, and one refractory tile is fixed to the top surfaces of two or more boiler water tubes, a first step of using one of the plurality of refractory tiles as a reference tile, and arranging the reference tile by hanging it on the plurality of hooks, the number of which corresponds to the number of the recesses formed on the back surface of the reference tile, without applying a fireproof joint material to the back surface of the reference tile; a second step of applying a fireproof joint material to the back surface of one of the plurality of fireproof tiles that is different from the reference tile, and hooking the fireproof tile coated with the fireproof joint material onto hooks of the plurality of hooks, including the hook immediately adjacent to the reference hook, the number of which corresponds to the number of the recesses formed on the back surface of the one of the fireproof tiles that is different from the reference tile, and then aligning the fireproof tile coated with the fireproof joint material with the reference tile and pressing the fireproof tile coated with the fireproof joint material toward the water pipe panel to fix it; a first branching step of applying a fire-resistant joint material to the back surface of one of the plurality of fire-resistant tiles, which is different from the fire-resistant tiles fixed in all of the steps preceding this step, and applying a fire-resistant joint material to the back surface of the fire-resistant tile, and then hooking the reference tile onto the reference hook after the second step; and a second branching step of applying a fire-resistant joint material to the back surface of one of the plurality of fire-resistant tiles, which is different from the fire-resistant tiles fixed in all of the steps preceding this step, and then hooking the fire-resistant tile onto the hook next to the hook onto which the fire-resistant tile fixed in the step immediately before this step or the step two steps before this step was hooked. a second branching step of hooking the refractory tile coated with the fireproof joint material onto hooks that include hooks and have no refractory tile hooked on them, the number of which corresponds to the number of the recesses formed on the back surface of one refractory tile among the plurality of refractory tiles, which is different from the refractory tiles fixed in all of the previous steps of this step, and then pressing the refractory tile coated with the fireproof joint material toward the water pipe panel while aligning it with the refractory tile fixed in the step immediately before this step or the step two steps before this step; and a fourth step of repeating the third step a predetermined number of times after the third step; A method for installing fireproof tiles for protecting boiler water tubes.

2. The fixed plurality of refractory tiles are divided into a plurality of rectangular tile groups each having a plurality of refractory tiles arranged vertically or horizontally, a step of embedding a fire-resistant expansion filler material in the predetermined space between two adjacent tile pairs among the plurality of tile pairs; applying a refractory joint material to the predetermined gap between two adjacent refractory tiles included in one tile set; 2. The method for installing a refractory tile for protecting a boiler water tube according to claim 1, further comprising:

3. 3. The method for installing refractory tiles for protecting boiler water pipes according to claim 2, wherein the reference hook is a hook for hanging a refractory tile located at the lowest level inside the tile set or fixed to either one of the lowest level and both ends thereof.

4. 4. The method for installing refractory tiles for protecting boiler water pipes according to claim 3, wherein the tile groups include a first tile group in which three refractory tiles are arranged vertically and three horizontally, a second tile group in which two refractory tiles are arranged vertically and two horizontally, a third tile group in which three or more refractory tiles are arranged vertically and two horizontally, a fourth tile group in which two refractory tiles are arranged vertically and three or more horizontally, a fifth tile group in which refractory tiles are arranged in a row only vertically, or a sixth tile group in which tile groups are arranged in a row only horizontally, or a mixture of multiple types of tile groups among the first to sixth tile groups.

5. The refractory tiles include a first interlocking refractory tile having an interlocking protrusion protruding from above a central portion and an interlocking recess formed below the central portion, into which the interlocking protrusion of another refractory tile can be fitted; a second interlocking refractory tile having the same shape as the first interlocking refractory tile except that the interlocking recess is not formed; and a third interlocking refractory tile having the same shape as the first interlocking refractory tile except that the interlocking protrusion is not formed, In the first tile set, the third tile set, or the fifth tile set in which three or more refractory tiles are fixed in the vertical direction, the interlocking second refractory tile is fixed to the bottom row in the vertical direction, the interlocking third refractory tile is fixed to the top row in the vertical direction, and the interlocking first refractory tile is fixed to a row that is second row or higher and lower than the top row in the vertical direction, 5. The method for installing refractory tiles for protecting boiler water pipes according to claim 4, wherein in the second tile set, the fourth tile set, or the fifth tile set in which two refractory tiles are fixed in the vertical direction, the interlocking second refractory tile is fixed to the bottom row in the vertical direction, and the interlocking third refractory tile is fixed to the top row in the vertical direction.

6. 5. The method for installing refractory tiles for protecting boiler water tubes according to claim 1, wherein the refractory tiles are formed with a plurality of recesses for hanging hooks and cover the upper surfaces of three or more boiler water tubes.

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