Refractory tile, refractory structure, combustion furnace, and refractory tile installation method

Abstract

To provide a refractory tile capable of simplifying a construction step and excellent in gas corrosion resistance performance, a refractory structure, a combustion furnace and a method for attaching a refractory tile.SOLUTION: A refractory tile 30 is attached to a boiler water pipe 18 with a filling material 40 interposed therebetween. The refractory tile 30 has an insertion hole 32 into which a stud bolt 22 protruding from the boiler water pipe 18 is inserted. The insertion hole 32 is formed to be elongated, and has a longer dimension of a major axis larger than an outer diameter of the stud bolt 22, so that the filling material 40 can be arranged inside the insertion hole 32.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to refractory tiles, refractory structures, combustion furnaces, and methods of installing refractory tiles. [Background technology]

[0002] A known fireproof structure for boiler water tube walls is a structure in which the surface of the boiler water tube is covered with refractory tiles. The refractory tiles are fixed to fixtures protruding from the boiler water tubes, with a filler material filling the space between the tiles and the boiler water tubes on the back side.

[0003] When the above-mentioned boiler water pipe wall is installed in a combustion furnace such as a refuse incineration facility or a sludge gasification facility, it is desirable to provide a means for preventing corrosion of the fastening metal fittings due to gases generated in the furnace.

[0004] For example, a structure has been proposed in which a fixing bracket (bolt and nut) is inserted into an insertion hole in a fireproof tile and a protective cap is attached to the tip of the fixing bracket exposed on the surface side of the fireproof tile (Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-190038 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the technology described in Patent Document 1 requires that the protective cap be attached in a separate process after filling the space behind the refractory tile with a filler. Also, a gap is created between the fixing metal fitting and the protective cap, which may reduce gas corrosion resistance.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a refractory tile, a refractory structure, a combustion furnace, and a method for installing refractory tiles that can simplify the construction process and have excellent gas corrosion resistance. [Means for solving the problem]

[0008] Specific means for achieving the above object are as follows. <1> A refractory tile attached to a boiler water pipe with a filler interposed therebetween, The boiler water pipe has an insertion hole through which a fixing metal fitting protruding from the boiler water pipe is inserted. The insertion hole is formed to be elongated, and the major axis dimension is set to be larger than the outer diameter of the fixing metal fitting, so that the filler can be placed inside the insertion hole. <2> The insertion hole is formed to be elongated along the vertical direction. <1> The refractory tile according to claim 1. <3> The insertion holes are configured so that a portion of the filler filled on the back side of the refractory tile is pushed out to the front side through the insertion holes, thereby sealing the fixing metal fittings. <1> or <2> The refractory tile according to claim 1. <4> The major diameter of the insertion hole expands toward the rear surface side of the refractory tile. <1> ~ <3> 10. The fireproof tile according to any one of the above. <5> a counterbore hole communicating with the insertion hole and adapted to receive a tip end of the fastening metal fitting is formed on the surface side of the refractory tile; The opening area of ​​the counterbore hole is set larger than that of the insertion hole. <1> ~ <4> 10. The fireproof tile according to any one of the above. <6> A filling port is provided at the upper end of the refractory tile, which is connected to the back space of the tile and through which a filler can be filled. <1> ~ <5> 10. The fireproof tile according to any one of the above. <7> The filling port has an arc-shaped opening cross section and is tapered so that its diameter increases toward the rear surface of the refractory tile. <6> The refractory tile according to claim 1. <8> A predetermined space is provided between the back surface of the refractory tile and the outer periphery of the boiler water pipe, and a recess is formed along the outer periphery of the boiler water pipe, The filling port is formed by connecting an end portion on the rear side of the refractory tile to the recessed portion. <6> or <7> The refractory tile according to claim 1. <9> A spacer for maintaining a space between the insertion hole and the fixing bracket is provided at the upper portion of the insertion hole. <1> ~ <8> 10. The fireproof tile according to any one of the above. <10> The spacing means is configured by a spacing protrusion protruding from the inner circumferential surface of the insertion hole. <9> The refractory tile according to claim 1. <11> The spacing means is configured by forming the opening cross section of the upper part of the insertion hole into a tapered shape that narrows toward the upper side. <9> The refractory tile according to claim 1. <12> Parallel extension a water tube wall having a plurality of boiler water tubes; a fixing metal fitting protruding from the boiler water pipe; a refractory tile that is attached to the boiler water pipe using the fixing metal fittings and has a back space that can be filled with a filler material on a back side facing the boiler water pipe, The refractory tile has an insertion hole through which the fastening metal fitting is inserted, The insertion hole is formed long and narrow, and the major axis dimension is set to be larger than the outer diameter of the fixing fixture, making it possible to place the filler material inside the insertion hole. <13> A combustion furnace using a refractory wall to form a combustion chamber in which fuel is burned, the fireproof wall includes a boiler water pipe and a fireproof tile attached to the boiler water pipe with a filler material interposed therebetween; The refractory tile is The boiler water pipe has an insertion hole through which a fixing metal fitting protruding from the boiler water pipe is inserted. The insertion hole is formed long and narrow, and the major axis dimension is set to be larger than the outer diameter of the fixing fixture, making it possible to place the filler material inside the insertion hole. <14> A method for installing refractory tiles on boiler water pipes with a filler material interposed therebetween, comprising the steps of: The refractory tile has an insertion hole formed in an elongated shape and the major axis of the insertion hole is set to be larger than the outer diameter of the fixing metal fitting protruding from the boiler water pipe, a metal fitting fixing step of inserting the metal fitting into the insertion hole of the refractory tile and fixing a tip of the metal fitting from the surface side of the refractory tile; a filling step of filling the filler material on the back side of the refractory tile facing the boiler water pipe, interposing the filler material between the boiler water pipe and the refractory tile, and extruding a part of the filler material from the back side of the refractory tile into the insertion hole to seal the inside of the insertion hole; How to install fireproof tiles, including: [Effects of the Invention]

[0009] According to the present disclosure, the construction process can be simplified, and a refractory tile, a refractory structure, a combustion furnace, and a method for installing the refractory tile, which have excellent gas corrosion resistance, are provided. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing a combustion furnace to which refractory tiles according to an embodiment are applied. [Figure 2] 1A is a front view showing the surface of a refractory wall of a combustion furnace according to an embodiment, and FIG. 1B is a vertical cross-sectional view of the refractory wall. [Figure 3] FIG. 2 is a perspective view of the refractory tile according to the embodiment, seen from the rear side. [Figure 4] FIG. 1 is a perspective view of a refractory tile according to an embodiment, viewed from the front surface side. [Figure 5](A) is a rear view of the refractory tile, (B) is a cross-sectional view showing a cross section along line 5B-5B in Figure 5(A), and (C) is a cross-sectional view showing a cross section along line 5C-5C in Figure 5(A). [Figure 6] FIG. 10 is a rear view showing a first modified example of the refractory tile. [Figure 7] FIG. 10 is a rear view showing a second modified example of the refractory tile. [Figure 8] 8(A) and 8(B) are views showing a third modified example of a fireproof tile, in which (A) is a rear view, (B) is a cross-sectional view taken along line 8B-8B in FIG. 8(A), and (C) is a cross-sectional view taken along line 8C-8C in FIG. 8(A). DETAILED DESCRIPTION OF THE INVENTION

[0011] A combustion furnace 10 to which a refractory tile 30 according to an embodiment of the present disclosure is applied will be described below with reference to Figures 1 to 5. In the following description, the "rear surface of the refractory tile" refers to the side of the refractory tile that faces the water pipe wall, and the "front surface of the refractory tile" refers to the side of the refractory tile that faces the inside of the combustion furnace.

[0012] As shown in FIG. 1, a combustion furnace 10 has a combustion chamber 14 whose interior side is formed by a refractory wall 12. The refractory wall 12 includes a water tube wall 16 with a plurality of boiler water tubes 18, a plurality of refractory tiles 30 (see FIG. 2) covering the surface of the water tube wall 16, and a filler material 40 interposed between the water tube wall 16 and the refractory tiles 30. The combustion furnace 10 burns solid fuel in the combustion chamber 14 to evaporate water in the boiler water tubes 18. Examples of solid fuel include waste such as garbage, biomass (wood fuel), sludge, fossil fuel, and RPF (refuse-derived paper and plastics densified fuel). The boiler water tubes 18 are connected to, for example, a drive chamber of a power-generating turbine to drive the turbine with steam power. This converts thermal energy in the combustion chamber 14 into driving energy for power generation.

[0013] 2(A) and 2(B), the water tube wall 16 has a plurality of boiler water tubes 18 extending in parallel. The plurality of boiler water tubes 18 are connected by welded plate-like fins 20 to form the water tube wall 16.

[0014] The extending direction of the boiler water pipes 18 is not particularly limited, and examples thereof include the vertical direction (including nearly vertical), a direction inclined relative to the vertical direction, and a curved direction with an R (for example, a circular arc). The extending direction of the boiler water pipes 18 can be horizontal, but considering the direction of steam flow, the extending direction of the boiler water pipes 18 is preferably vertical or inclined relative to the vertical direction. The multiple boiler water pipes 18 extend parallel to one another. In this specification, vertical (almost vertical) preferably means vertical ±10°, and more preferably vertical ±5°.

[0015] A plurality of stud bolts 22 projecting from the fins 20 of the boiler water tubes 18 toward the inside of the furnace are attached by welding to the surface (inside of the furnace) of the water tube wall 16. These stud bolts 22 are inserted into insertion holes 32 of the refractory tiles 30, and nuts 24 are threaded onto the ends of the stud bolts 22. The stud bolts 22 correspond to the "fixing hardware" in this invention.

[0016] The refractory tiles 30 are, for example, made of a standard refractory material whose main component is silicon carbide (SiC) and are formed in the shape of rectangular plates. By using SiC, which has high thermal conductivity, as the main component, the thermal energy generated in the combustion chamber 14 is transmitted to the boiler water tubes 18 via the refractory tiles 30 with high efficiency.

[0017] As shown in Figures 2(A) and 2(B), the refractory tiles 30 are fixed to the stud bolts 22 with a back space S formed on the back side facing the boiler water pipes 18. This back space S is filled with a filler material 40, which completely seals the gaps between the back space S and the joints 31 of the refractory tiles 30, thereby efficiently transferring heat generated in the combustion chamber 14 to the boiler water pipes 18. It also prevents gas generated in the furnace from reaching the boiler water pipes 18. The filler material 40 is also filled into insertion holes 32 and counterbore holes 34 (described later) formed in the refractory tiles 30, and seals the stud bolts 22 and nuts 24 placed therein.

[0018] The filler 40 can be made of mortar, concrete, or the like, and is preferably made of a monolithic refractory. Examples of monolithic refractories include refractory mortar and refractory castable. The filler 40 is preferably made of a monolithic refractory containing a refractory aggregate mainly composed of SiC, which has high thermal conductivity. In the present embodiment, as an example, the filler 40 is made of a refractory castable containing a refractory aggregate mainly composed of SiC.

[0019] The filler 40 made of refractory castable has a lower water content during mixing than refractory mortar and the like, and therefore has a low porosity (i.e., equivalent to air permeability) after hardening, effectively suppressing gas penetration. This improves the gas corrosion resistance of the fireproof wall 12 and extends its service life. Furthermore, the filler 40 having such a configuration is filled by attaching a plurality of refractory tiles 30 so as to cover the surface of the water pipe wall 16, sealing the joints 31 between the refractory tiles 30 with ceramic paper or the like, and pouring it into the back space S from the upper end portion (filling port 36) of the inner wall formed by the plurality of refractory tiles 30.

[0020] (Refractory tile shape) Next, the shape and structural features of the refractory tile 30 will be described in detail with reference to FIGS. 3 to 5. In the following description, the up-down direction of the refractory tile 30 coincides with the up-down direction along the extension direction of the boiler water pipes 18. Note that "along the extension direction of the boiler water pipes" is a broad concept that includes both a direction strictly parallel to the extension direction of the boiler water pipes and a direction inclined relative to the extension direction of the boiler water pipes. In this embodiment, a case where the boiler water pipes 18 extend vertically (in the direction of gravity) will be described as an example. In this case, the up-down direction of the refractory tile 30 coincides with the up-down direction of the wall surface of the fireproof wall 12 when it is constructed.

[0021] FIG. 3 shows the back surface of the refractory tile 30 facing the boiler water pipe 18. As shown in this figure, an insertion hole 32 through which the stud bolt 22 is inserted is formed in the center of the back surface of the refractory tile 30. This insertion hole 32 is formed in an elongated oval shape, and the major axis dimension is set to be larger than the outer diameter of the stud bolt 22. Therefore, when the stud bolt 22 is inserted into the center of the insertion hole 32, spaces are formed on both sides of the stud bolt 22 in the major axis direction as filling margins for the filler material 40. As a result, part of the filler material 40 filled on the back side of the refractory tile 30 flows into the insertion hole, and the outer periphery of the stud bolt 22 is sealed with the filler material 40, fixing it in the insertion hole 32. In FIG. 5(A), the major axis of the insertion hole 32 is indicated by the symbol "D1."

[0022] The major axis direction of the insertion hole 32 is not particularly limited, and may be vertical (including nearly vertical), a direction inclined relative to the vertical, or horizontal (including nearly horizontal). From the viewpoint of facilitating the escape of air from the insertion hole 32 when the filler 40 is filled, the major axis direction is preferably a direction along the vertical direction, i.e., vertical (including nearly vertical) or a direction inclined relative to the vertical direction, and it is most preferable that the major axis direction coincides with the vertical direction. In one example of this embodiment, the major axis direction of the insertion hole 32 coincides with the vertical direction (the up-and-down direction of the refractory tile 30).

[0023] 5(B), the major axis of the insertion hole 32 increases from the front side toward the back side of the refractory tile 30. With this configuration, the filler 40 poured from above into the back space S of the refractory tile 30 is smoothly guided into the insertion hole 32 in the direction of gravity, thereby reducing the stress load due to the filling pressure of the filler 40.

[0024] 4, a counterbore hole 34 is formed on the surface side of the refractory tile 30. The counterbore hole 34 communicates with the insertion hole 32 and receives the tip of the stud bolt 22. That is, the back space S of the refractory tile 30 communicates with the inside of the furnace via the insertion hole 32 and the counterbore hole 34. The counterbore hole 34 is formed in a circular shape, and the inner diameter is set to be smaller than the major axis of the insertion hole 32 and larger than the minor axis.

[0025] Here, the opening area of ​​the counterbore hole 34 is set larger than the opening area of ​​the insertion hole 32, and the tip of the stud bolt 22 and the nut 24 screwed onto said tip are housed inside the counterbore hole 34. With this configuration, the filler 40 poured into the back space S of the refractory tile 30 from above is pushed out through the insertion hole 32 into the counterbore hole 34, sealing the surfaces of the stud bolt 22 and the nut 24 with a sufficient thickness (see FIG. 2(B)). Corrosion of the stud bolt 22 and the nut 24 due to gas generated in the furnace can be effectively suppressed.

[0026] As shown in FIG. 4 , the upper end of the refractory tile 30 is provided with a filling port 36 that communicates with the back space S of the refractory tile 30 and allows filling of the filler material 40 from the surface side of the refractory tile 30. The filling port 36 is formed as a notch that penetrates the refractory tile 30 in the thickness direction and has an arc-shaped opening cross section. With this configuration, when some of the refractory tiles 30 that make up the refractory wall 12 need to be replaced during repair of the combustion furnace 10, it is not necessary to provide a work space above the refractory tile 30 to pour in the filler material 40. This makes it possible to replace the refractory tiles 30 one by one, thereby reducing the scale and cost of the repair work.

[0027] 5(A) and 5(B), the filling port 36 of the refractory tile 30 is formed in a tapered shape with a diameter increasing from the front side toward the back side of the refractory tile 30. With this configuration, the filler 40 poured from the front side of the refractory tile 30 during repair is smoothly guided into the back space S in the direction of gravity, and the stress load due to the filling pressure of the filler 40 can be reduced.

[0028] 3, the rear end of the filling port 36 is connected to a recess 38 formed on the rear surface of the refractory tile 30. The recess 38 is recessed in an arc shape along the outer periphery of the boiler water tube 18 arranged opposite the recess 38. A plurality of protrusions 39 protruding toward the boiler water tube 18 are integrally formed at the deepest part of the recess 38, and the protrusions 39 abut against the outer periphery of the boiler water tube 18. This maintains a constant gap between the rear surface of the refractory tile 30 and the outer periphery of the boiler water tube 18, forming a rear space S. In this embodiment, the recesses 38 are formed on both sides of an insertion hole 32 formed in the center of the rear surface of the refractory tile 30.

[0029] The rear end of the filling port 36 is connected to the recess 38, so that the filler 40 poured into the front surface of the refractory tile 30 during repair can be spread evenly throughout the entire rear space S of the refractory tile 30. This further reduces the stress load caused by the filling pressure of the filler 40.

[0030] The following shows an example of the dimensions of the refractory tile 30. The shape of the refractory tile 30 is not limited to the example below, and depends on the design of the boiler water tubes 18 (the diameter of the boiler water tubes 18 and the pitch of the plurality of boiler water tubes), the target heat transfer coefficient when generating electricity, and the like. The length of one side of the refractory tile may be 50 mm to 500 mm, 80 mm to 400 mm, or 100 mm to 250 mm. The thickness of the thickest part of the refractory tile may be 10 mm to 100 mm, 20 mm to 70 mm, or 35 mm to 50 mm. The major diameter of the insertion hole may be 10 mm to 100 mm, 20 mm to 80 mm, or 40 mm to 60 mm. The enlarged major diameter of the insertion hole on the rear side may be 1.05 times or more, 1.1 times or more, or 1.2 times or more than that on the front side. The opening area of ​​the counterbore is 500 mm 2 ~2000mm 2 It may be 700mm 2 ~1500mm 2 may be 900mm 2 ~1300mm 2 may be.

[0031] In the present embodiment (FIGS. 3 and 5), an example is shown in which two recesses 38 are formed in the refractory tile 30, but the present invention is not limited thereto. For example, the refractory tile 30 may have three or more recesses 38 formed therein and face three or more boiler water pipes 18. In this case, it is sufficient to form one or more insertion holes 32. For example, if the back surface of the refractory tile faces three boiler water pipes 18 and the refractory tile 30 has three recesses 38 along the outer periphery of the boiler water pipes 18, two general surfaces (flat surfaces) sandwiched between two recesses 38 are formed. In such a configuration, the insertion holes 32 may be formed in each of the two general surfaces, or the insertion holes 32 may be formed in one of the two general surfaces. If the insertion holes 32 are formed between all of the recesses, the refractory tiles can be installed in a balanced manner. If the insertion holes 32 are formed appropriately rather than between all the recesses, the number of nuts to be tightened when installing the refractory tiles can be reduced, simplifying the installation.

[0032] (How to install fireproof tiles) The refractory tile 30 having the above configuration is installed by forming the water pipe wall 16 inside the furnace, then performing a fixing fitting insertion process in which the stud bolts 22 are inserted into the insertion holes 32 of the refractory tile 30, and then performing a filling process in which the filler 40 is poured into the back space S.

[0033] In the fastener insertion step, after the stud bolt 22 is inserted into the insertion hole 32, a nut 24 is screwed onto the tip of the stud bolt 22 exposed on the surface side of the refractory tile 30. While screwing the nut 24 onto the tip of the stud bolt 22 is not essential to the structure of the present disclosure, it can stabilize the positioning of the refractory tile 30 relative to the stud bolt 22 and increase the fixing strength of the refractory tile.

[0034] In the filling process, the filler 40 is filled into the back space S from the upper end side of the refractory tile 30, and the filler 40 is interposed between the boiler water pipe 18 and the refractory tile 30. At this time, a portion of the filler 40 is extruded from the back side of the refractory tile 30 into the insertion hole 32, sealing the inside of the insertion hole 32. Thereafter, the filler 40 hardens, completing the fixing of the refractory tile 30 and the sealing of the stud bolt 22. In other words, in the above process, the fixing of the refractory tile 30 and the capping of the fixing hardware (the stud bolt 22 and the nut 24) can be completed in a single process. The same process can also be used when replacing tiles during repairs.

[0035] (Action and effect) As described above, in the refractory tile 30 of the above embodiment, the insertion holes 32 formed on the back surface are elongated, with the major axis dimension set to be larger than the outer diameter of the stud bolts 22. This makes it possible to push the filler 40 filled in the back space S of the refractory tile 30 toward the front surface and place the filler 40 inside the insertion holes 32. In this state, the filler 40 placed inside the insertion holes 32 fixes the position of the refractory tile 30 relative to the stud bolts 22, and simultaneously completes capping of the stud bolts to achieve gas corrosion resistance. Therefore, the construction process can be simplified and a fireproof wall 12 with excellent gas corrosion resistance can be manufactured.

[0036] Furthermore, by aligning the direction along the vertical direction as the long diameter direction of the insertion hole 32, air inside the insertion hole 32 can be easily released when the filler 40 is filled.

[0037] In addition, since the long diameter of the insertion hole 32 is expanded toward the back side of the refractory tile 30, the filler 40 filled in the back space S is smoothly guided into the insertion hole 32, and the stress load due to the filling pressure of the filler 40 can be reduced.

[0038] The filler 40 extruded toward the surface through the insertion hole 32 fills the counterbore 34 and seals the tip of the stud bolt 22. By setting the opening area of ​​the counterbore 34 larger than the opening area of ​​the insertion hole 32, the thickness of the layer coated with the filler 40 on the surface side of the refractory tile 30 can be increased. This effectively prevents corrosion of the stud bolt 22 and nut 24.

[0039] The upper end of the refractory tile 30 is provided with a filling port 36 that communicates with the back space S of the tile and allows filling with the filler 40. With this configuration, when replacing the refractory tile 30, it is not necessary to provide a working space above the refractory tile 30 for pouring the filler 40. This makes it possible to replace the refractory tiles 30 one by one, thereby reducing the scale and cost of repair work.

[0040] Furthermore, by forming the filling port 36 in a tapered shape with a larger diameter toward the back side of the refractory tile 30, the filling material 40 can be poured smoothly and the stress load due to the filling pressure of the filling material 40 can be reduced.

[0041] Furthermore, by connecting the rear end of the filling port 36 to the recess 38 formed on the rear surface of the refractory tile 30, the filler 40 poured from the filling port 36 can be spread evenly throughout the entire rear space S, thereby further reducing the stress load caused by the filling pressure of the filler 40.

[0042] Next, first to third modified examples of the refractory tile 30 according to the above embodiment will be described with reference to Figures 6 to 8. In each modified example, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0043] (First variation of refractory tile) 6 is a rear view of a refractory tile 50 according to a first modified example. As shown in this figure, the refractory tile 50 according to this modified example is characterized in that it is provided with spacing protrusions 52 protruding from the inner circumferential surface inside the insertion holes 32 as spacing means. The other configurations are the same as those of the above embodiment.

[0044] The spacing protrusions 52 are provided on both sides of the minor diameter of the insertion hole 32. The width of the gap provided between this pair of spacing protrusions 52 is set smaller than the outer diameter of the stud bolt. With this configuration, when the stud bolt 22 is inserted below the pair of spacing protrusions 52, the stud bolt 22 is locked by the pair of spacing protrusions 52 due to the weight of the refractory tile 50. This results in the stud bolt 22 being held at a height close to the center of the insertion hole 32, and the spacing from the stud bolt 22 can be maintained at the upper part of the insertion hole 32.

[0045] The refractory tile 50 according to the first modified example described above basically follows the configuration of the refractory tile 30 according to the above embodiment, and therefore can achieve the same actions and effects. Furthermore, with the above configuration, when the stud bolt 22 is inserted into the insertion hole 32, the refractory tile 30 can be temporarily fixed in place with spaces formed on both sides of the stud bolt 22 in the major diameter direction as spaces for filling the filler 40. This improves workability during installation.

[0046] (Second variation of refractory tile) 7 is a rear view of a refractory tile 60 according to a second modified example. As shown in this figure, the refractory tile 60 according to this modified example is characterized in that the opening cross section at the top of the insertion hole 62 is formed in a tapered shape that narrows toward the upper side, as a spacing means. The other configurations are the same as those of the above embodiment.

[0047] In this configuration, when the stud bolt 22 is inserted into the insertion hole 62, the stud bolt 22 is held at a height close to the center of the insertion hole 32, as in the first modified example above, and a distance from the stud bolt 22 can be maintained at the upper part of the insertion hole 62.

[0048] The refractory tile 60 according to this second modification also basically follows the configuration of the refractory tile 30 according to the above embodiment, and therefore can achieve the same actions and effects. Furthermore, when the stud bolt 22 is inserted into the insertion hole 62, the refractory tile 60 can be temporarily fixed in place with spaces formed on both sides of the stud bolt 22 in the major diameter direction as spaces for filling the filler 40. This improves workability during installation.

[0049] (Third variant of refractory tile) Figures 8(A) to 8(C) show a refractory tile 70 according to a third modified example. Figure 8(A) shows the back surface of the refractory tile 70, Figure 8(B) shows a cross section taken along line 8B-8B in Figure 8(A), and Figure 8(C) shows a cross section taken along line 8C-8C in Figure 8(A).

[0050] As shown in these figures, the refractory tile 70 according to this modification is characterized in that the height positions of the insertion holes 72 formed on the back side and the counterbore holes 74 formed on the front side are different in the vertical direction of the refractory tile 70. The other configurations are the same as those of the above embodiment.

[0051] As shown in FIG. 8(A), the insertion hole 72 is elongated in the vertical direction, with the major axis dimension set larger than the outer diameter of the stud bolt 22. The insertion hole 72 is formed as an inverted T-shape overall. The major axis of the insertion hole 72 is the longest part (convex part) of the inverted T-shape. The upper part of the insertion hole 72 is a small diameter section 72A whose minor axis dimension is set approximately the same as the outer diameter of the stud bolt 22. The lower part is a large diameter section 72B whose minor axis dimension is set larger than the outer diameter of the stud bolt 22. The stud bolt 22 is inserted through the large diameter section 72B that forms the lower part of the insertion hole 72. In FIG. 8(A), the major axis of the insertion hole 72 is indicated by the symbol "D2".

[0052] 8(B), a counterbore hole 74 is formed on the surface side of the refractory tile 70. The counterbore hole 74 communicates with the insertion hole 72 and receives the tip of the stud bolt 22. The counterbore hole 74 is formed in a rectangular shape and is located above the large diameter portion 72B of the insertion hole 72.

[0053] The insertion hole 72 and the counterbore hole 74 are connected by a crank-shaped through passage inside the refractory tile 70. Specifically, the insertion hole 72 and the counterbore hole 74, which extend along the thickness direction of the refractory tile 70, are connected by a communication portion 76 that extends in the vertical direction.

[0054] With this configuration, the tip of the stud bolt 22 is positioned deep in the counterbore 74 (below the communicating portion 76) and is not exposed on the surface of the refractory tile 70. The nut 24 that screws onto the tip of the stud bolt 22 is inserted through the counterbore 74, and can be tightened by extending the worker's fingertips to the deepest part of the counterbore 74. At this time, the tightened nut 24 abuts against the lower end of the small diameter portion 72A, locking the refractory tile 70. As a result, when the stud bolt 22 is inserted into the insertion hole 72, the refractory tile 70 can be temporarily fixed in place with spaces formed on both sides of the stud bolt 22 in the major diameter direction as filling margins for the filler 40. As shown in FIG. 8(B), the nut 24 of this embodiment is integrally provided with a plate-shaped abutment portion 78 that extends to the height position of the small diameter portion 72A of the insertion hole 72, and the fastening position of the nut 24 is fixed by the abutment portion 78 abutting against the side surface of the small diameter portion 72A.

[0055] A portion of the filler material 40 poured onto the back side of the refractory tile 70 is pushed out toward the front side through the insertion hole 72 and filled into the counterbore hole 74. This causes the stud bolt 22 and the nut 24 to be sealed with the filler material 40. In this embodiment, the upper and lower inner peripheral surfaces of the counterbore hole 74 are inclined downward from the front side toward the back side, which allows the filler material 40 to flow smoothly into the counterbore hole 74 and reduces the stress load caused by the filling pressure of the filler material 40.

[0056] The refractory tile 70 according to the third modification also basically follows the configuration of the refractory tile 30 according to the above embodiment, and therefore can achieve the same effects and advantages. Furthermore, because the tips of the stud bolts 22 are not exposed on the surface side of the refractory tile 70, corrosion of the stud bolts 22 due to gases generated in the furnace is effectively suppressed. [supplementary explanation]

[0057] The configurations of the above-described embodiment and each modified example can be combined as appropriate without changing or departing from the gist of the present invention.

[0058] In the above embodiment and each modified example, the filler 40 is made of refractory castable, but this is not limiting. The filler 40 can also be made of mortar or concrete. When the filler is made of mortar, the filler is applied to the back side of the refractory tile, and then a stud bolt is inserted into the insertion hole of the refractory tile. Then, the refractory tile is pressed in from the front side, so that part of the filler is pushed out into the insertion hole.

[0059] The spacing protrusions 52 formed on the refractory tile 50 according to the first modified example are not limited to a pair provided on the side surface on the minor axis side. For example, a single spacing protrusion may be provided on the upper surface of the inner circumferential surface of the insertion hole. [Explanation of symbols]

[0060] 10 Combustion furnace 12 Fireproof wall (fireproof structure) 14 Combustion chamber 16 Water pipe wall 18 Boiler water tubes 30 Refractory tiles S Back space 32 Insertion hole 40 Filler 22 Stud bolt (fixing bracket) 34 Counterbore 36 Filling port 38 Recess 50 Refractory tiles 52 Spacing protrusion (space maintaining means) 60 Refractory tiles 62 Insertion hole (spacing means) 70 Refractory tiles 72 Insertion hole 74 Counterbore

Claims

1. A refractory tile attached to a boiler water pipe with a filler interposed therebetween, The boiler water pipe has an insertion hole through which a fixing metal fitting protruding from the boiler water pipe is inserted. The insertion hole is formed to be elongated, and the major axis dimension is set to be larger than the outer diameter of the fixing member, so that the filler can be placed inside the insertion hole, The refractory tile has a filling port at its upper end, which is in communication with the back space of the tile and through which a filler can be filled.

2. The refractory tile according to claim 1 , wherein the insertion hole is elongated along the vertical direction.

3. 3. The refractory tile according to claim 1, wherein a major axis of the insertion hole increases toward a rear surface side of the refractory tile.

4. a counterbore hole communicating with the insertion hole and adapted to receive a tip end of the fastening metal fitting is formed on the surface side of the refractory tile; The refractory tile according to any one of claims 1 to 3, wherein an opening area of ​​the counterbore hole is set larger than that of the insertion hole.

5. The refractory tile according to any one of claims 1 to 4, wherein the filling port has an arc-shaped opening cross section and is formed in a tapered shape with a diameter increasing toward the back side of the refractory tile.

6. A predetermined space is provided between the back surface of the refractory tile and the outer periphery of the boiler water pipe, and a recess is formed along the outer periphery of the boiler water pipe, The refractory tile according to any one of claims 1 to 5, wherein the filling port is formed by connecting an end portion on the rear side of the refractory tile to the recess.

7. A refractory tile attached to a boiler water pipe with a filler interposed therebetween, The boiler water pipe has an insertion hole through which a fixing metal fitting protruding from the boiler water pipe is inserted. The insertion hole is formed to be elongated, and the major axis dimension is set to be larger than the outer diameter of the fixing member, so that the filler can be placed inside the insertion hole, The refractory tile has a spacing means provided at the top of the insertion hole for maintaining a spacing between the insertion hole and the fastening metal fitting.

8. 8. The refractory tile according to claim 7, wherein the spacing means is formed of spacing projections projecting from the inner peripheral surface of the insertion hole.

9. 8. The refractory tile according to claim 7, wherein the spacing means is configured by forming the opening cross section of the upper part of the insertion hole into a tapered shape that narrows toward the upper side.

10. a water tube wall having a plurality of boiler water tubes extending in parallel; a fixing metal fitting protruding from the boiler water pipe; a refractory tile that is attached to the boiler water pipe using the fixing metal fittings and has a back space that can be filled with a filler material on a back side facing the boiler water pipe, The refractory tile according to claim 1 or 7, wherein the refractory tile has an insertion hole through which the fastening metal fitting is inserted, The insertion hole is formed to be elongated, and the major axis dimension is set to be larger than the outer diameter of the fixing metal fitting, so that the filler can be placed inside the insertion hole. Fireproof structure.

11. A combustion furnace using a refractory wall to form a combustion chamber in which fuel is burned, the fireproof wall includes a boiler water pipe and a fireproof tile attached to the boiler water pipe with a filler material interposed therebetween; The refractory tile is The refractory tile according to claim 1 or 7, further comprising an insertion hole through which a fixing metal fitting protruding from a boiler water pipe is inserted, The insertion hole is formed long and narrow, and the major axis dimension is set to be larger than the outer diameter of the fixing fixture, so that the filler can be placed inside the insertion hole. Combustion furnace.

12. A method for installing refractory tiles on boiler water pipes with a filler material interposed therebetween, comprising the steps of:

10. The refractory tile according to claim 1 or 7, wherein the refractory tile has an insertion hole formed in an elongated shape and the major axis of the insertion hole is set to be larger than the outer diameter of the fixing metal fitting protruding from the boiler water pipe, a fastener insertion step of inserting the fastener into the insertion hole of the refractory tile; a filling step of filling the filler material on the back side of the refractory tile facing the boiler water pipe, interposing the filler material between the boiler water pipe and the refractory tile, and extruding a part of the filler material from the back side of the refractory tile into the insertion hole to seal the inside of the insertion hole; How to install fireproof tiles, including:

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