Refractory materials and their installation methods

Abstract

We provide protective refractory materials with excellent maintenance performance. [Solution] The protective fire-resistant material has a recess on its back surface into which the tip of the mounting bracket fixed to the protected member is inserted. A groove extends from the recess toward the end face in the direction of the protective fire-resistant material, and the fixing member is inserted through the groove and engages with the mounting bracket, thereby fixing the protective fire-resistant material to the mounting bracket.

Description

Technical Field

[0001] This specification discloses a technology related to refractory materials and their installation methods. Specifically, it discloses a technology related to protective refractory materials, refractory structures, construction methods of protective refractory materials, and replacement methods of protective refractory materials.

Background Art

[0002] Patent Document 1 discloses a protective refractory material used as the inner wall of a furnace. In Patent Document 1, a mounting bracket is welded to a water pipe arranged in the furnace, and grooves extending vertically are formed on the back surface of the protective refractory material. Then, the water pipe is protected from the furnace environment by fixing the protective refractory material to the mounting bracket.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, when fixing the protective refractory material to the mounting bracket, it is necessary to insert the mounting bracket into the groove from the lower end of the protective refractory material and slide the protective refractory material downward. Therefore, for example, when replacing a specific protective refractory material during furnace maintenance, in order to ensure the installation space of the protective refractory material, it is necessary to replace all the protective refractory materials arranged above the specific protective refractory material. It becomes necessary to replace even the protective refractory materials that originally do not need to be replaced, increasing the furnace maintenance time and maintenance cost. Therefore, the development of protective refractory materials with excellent maintenance performance is expected. This specification aims to provide a protective refractory material with excellent maintenance performance.

Means for Solving the Problems

[0005] The first technology disclosed herein is a protective refractory used to protect a member to be protected from the furnace environment. This protective refractory has a recess on its back surface into which the tip portion of a mounting bracket fixed to the member to be protected is inserted, and a groove extends from the recess toward the end face in the plane direction of the protective refractory, and a fixing member is inserted through the groove and engages with the mounting bracket, thereby fixing the protective refractory to the mounting bracket.

[0006] The second technology disclosed herein is a refractory material for protection of the first technology, which may have a fitting portion in the recess that fits with the tip of a mounting bracket.

[0007] A third technology disclosed herein is a protective refractory of the first or second technology, wherein an opening may be provided on the back side of the groove, extending from the end face in the surface direction of the protective refractory to the recess.

[0008] The fourth technology disclosed herein is a protective refractory of any of the first to third technologies, wherein the recess may be provided on the end face side of the protective refractory's surface center.

[0009] The fifth technology disclosed herein is a refractory structure for protecting a protected member from the furnace environment. This refractory structure may include a mounting bracket, one end of which is fixed to the protected member; a protective refractory material having a recess on its back surface into which the other end of the mounting bracket is inserted, and a groove extending from the recess to the end face in the surface direction; and a fixing member that is inserted through the groove and engages with the mounting bracket to fix the mounting bracket and the protective refractory material.

[0010] The sixth technology disclosed herein is a fire-resistant structure of the fifth technology, wherein the mounting bracket consists of a shaft and a plate-shaped member attached to the shaft and larger in size than the shaft, the recess is formed such that a gap is provided between the mounting bracket and the shaft when the mounting bracket is inserted into the recess, and the fixing member has an engagement groove that can engage with the shaft but cannot engage with the plate-shaped member, and the opening portion of the engagement groove may be provided in a direction that widens the opening width.

[0011] The seventh technology disclosed herein is a method for attaching a protective refractory material to a protected member in order to protect the member from the furnace environment. In this method, one end of a mounting bracket is fixed to the protected member, and the protective refractory material has a recess on its back surface into which the other end of the mounting bracket is inserted, and a groove extending from the recess to the end face in the surface direction. The method may include an insertion step of inserting the mounting bracket into the recess, a fixing step of inserting a fixing member that can engage with the mounting bracket into the groove and engaging the fixing member with the mounting bracket to fix the mounting bracket to the protective refractory material, and a filling step of filling the groove with amorphous refractory material and filling the space between the protective refractory material and the protected member with amorphous refractory material, thereby filling the gap between the mounting bracket and the protective refractory material with amorphous refractory material.

[0012] The eighth technology disclosed herein is a method for performing the seventh technology, which may include a holding step prior to the insertion step, in which a fixing member is held on the end face side within the groove using a holding jig.

[0013] The ninth technology disclosed herein is a method for implementing the seventh or eighth technology, wherein the mounting bracket comprises a shaft and a plate-shaped member attached to the shaft and larger in size than the shaft, and the method may include an adjustment step of adjusting the position of the plate-shaped member relative to the shaft prior to the insertion step.

[0014] A tenth technique disclosed herein is a method for replacing some of the protective refractories among a plurality of protective refractories attached to a protected member in order to protect the protected member from the furnace environment. In this method, the newly installed protective refractory material has a recess on its back surface into which the other end of a mounting bracket is inserted, and a groove extending from the recess to the end face in the surface direction. The method may include a protective refractory material removal step of removing the protective refractory material to be replaced from the protected member, a mounting bracket fixing step of removing the mounting bracket fixed to the protected member and fixing a new mounting bracket that can be inserted into the recess at a predetermined position on the protected member, a holding step of holding a fixing member that can engage with the mounting bracket on the end face side of the groove using a holding jig, an insertion step of inserting the mounting bracket into the groove, a fixing step of removing the holding jig, moving the fixing member to the mounting bracket side, and engaging the fixing member with the mounting bracket to fix the mounting bracket to the protective refractory material, and a filling step of filling the groove with amorphous refractory material and filling the space between the protective refractory material and the protected member with amorphous refractory material, thereby filling the gap between the mounting bracket and the protective refractory material with amorphous refractory material.

[0015] The 11th technology disclosed herein is a method of the 10th technology, wherein the new mounting bracket comprises a shaft and a plate-shaped member attached to the shaft and larger in size than the shaft, and may include an adjustment step prior to the insertion step of adjusting the position of the plate-shaped member with respect to the shaft.

[0016] The twelfth technique disclosed herein is a method of the tenth or eleventh technique, which may include a sizing step prior to the holding step, in which the surface size of the newly attached protective refractory is adjusted based on the size of the exposed surface of the member to be protected. [Brief explanation of the drawing]

[0017] [Figure 1] This shows a portion of the inner wall of a boiler-equipped incinerator with protective refractory material installed. [Figure 2] This shows a cross-section of the wall of an incinerator with a boiler. [Figure 3] A perspective view of the protective refractory material is shown. [Figure 4] Shows a cross-sectional view of the fireproof material for protection. [Figure 5] Shows a plan view of the fireproof material for protection. [Figure 6] Shows a cross-sectional view of the mounting bracket. [Figure 7] Shows the front view (a) and side view (b) of the fixing member. [Figure 8] Shows a diagram for explaining the construction method of the fireproof material for protection. [Figure 9] Shows the state where the fireproof material for protection is fixed to the mounting bracket. [Figure 10] Shows a diagram for explaining a modified example of the construction method of the fireproof material for protection. [Figure 11] Shows a perspective view of a modified example of the fireproof material for protection. [Figure 12] Shows a perspective view of a modified example of the fireproof material for protection. [Figure 13] Shows a perspective view of a modified example of the fireproof material for protection. [Figure 14] Shows a modified example of the fixing member. [Figure 15] Shows a diagram for explaining the conventional construction method of the fireproof material for protection.

Mode for Carrying Out the Invention

[0018] The protective refractories disclosed herein can be used as inner walls of heating furnaces such as electric furnaces and combustion furnaces such as incinerators. The protective refractories are used to protect protected components, such as the structures constituting the furnace and structures placed inside the furnace, from the furnace environment (high temperature, furnace gases, etc.). The protective refractories are pre-formed ceramic objects. They may be made of alumina, mullite, or SiC. In particular, SiC protective refractories offer high strength and heat resistance, enabling high durability (long lifespan). Among SiC protective refractories, nitride-bonded SiC refractories and oxide-bonded SiC refractories are available, but oxide-bonded SiC refractories offer higher strength and improved heat resistance. Therefore, the protective refractories disclosed herein are particularly preferably oxide-bonded SiC refractories. Furthermore, the proportion of SiC constituting the protective refractories may be increased to improve thermal conductivity. Specifically, the proportion of SiC constituting the protective refractory material may be 85% by mass or more.

[0019] Protective refractory materials can be used as the inner wall of a boiler-equipped incinerator. Specifically, protective refractory materials can be used to protect water pipes installed inside a boiler-equipped incinerator from the furnace environment. In this case, the protective refractory material is installed so as to cover the surface of the water pipes using mounting brackets fixed to the water pipes. The back surface of the protective refractory material is provided with a recess into which the mounting bracket enters, and the mounting bracket is moved into the protective refractory material relative to the mounting bracket and inserted into the recess. With protective refractory materials, after inserting the mounting bracket into the recess, the mounting bracket and protective refractory material can be fixed without moving the protective refractory material (for example, without moving it up or down). Specifically, the protective refractory material has grooves extending from the recess toward the end face in the surface direction of the protective refractory material, and when fixing the mounting bracket and protective refractory material, a fixing member is inserted from the groove and the fixing member is engaged with the mounting bracket. The protective refractories disclosed herein do not require movement of the protective refractories after the mounting brackets have been inserted into the recesses. Therefore, there is no need to secure mounting space around the protective refractories, and when replacing a specific protective refractories, there is no need to replace the surrounding protective refractories (protective refractories that do not need to be replaced). The protective refractories disclosed herein do not require the replacement of protective refractories that do not need to be replaced, thereby reducing furnace maintenance time and maintenance costs. [Examples]

[0020] Figure 1 shows a portion of the inner wall of a boiler-equipped incinerator 100. In the boiler-equipped incinerator 100, multiple water tubes 90 are arranged inside the furnace, and multiple protective refractory materials 10 are placed on the surface of the water tubes. The water tubes 90 are an example of a protected component. Note that Figure 1 shows a state in which a portion of the water tubes 90 is exposed. The exposed portion of the water tubes 90 in Figure 1 is actually covered with protective refractory materials 10. Note that in the inner wall of the boiler-equipped incinerator 100, it is not always necessary for the entire surface of the water tubes 90 to be covered with protective refractory materials 10, and depending on the temperature, there may be parts that are not partially covered with protective refractory materials 10. The water tubes 90 are connected to each other by flat fins 92. Mounting brackets 80 for fixing the protective refractory materials 10 to the water tubes 90 are welded to the fins 92. As will be explained in more detail later, the protective refractory material 10 is fixed to the water pipe 90 by inserting the mounting bracket 80 into a recess provided on the back surface of the protective refractory material 10.

[0021] Figure 2 shows a cross-section of the water pipe 90 and the protective refractory material 10. As shown in Figure 2, amorphous refractory material 70 is filled into the gap between the water pipe 90 and the protective refractory material 10, and into the gap between the water pipes 90, 90. As will be described in detail later, the amorphous refractory material 70 is filled by pouring it from the top of the protective refractory material 10 into the gap between the protective refractory material 10 and the water pipe 90, and into the gap between the protective refractory material 10 and the fin 92, after the protective refractory material 10 has been attached to the water pipe 90.

[0022] Figure 3 shows a perspective view of the back side of the protective refractory material 10. In the figure, X, Y, and Z represent coordinates, where the X direction corresponds to the thickness direction of the protective refractory material 10, the Y direction corresponds to the lateral direction of the protective refractory material 10, and the Z direction corresponds to the vertical direction of the protective refractory material 10. The back surface 12 of the protective refractory material 10 is provided with one first recess 20 and two second recesses 14. In the Y direction, the first recess 20 extends in the X direction and is provided between the second recesses 14, 14. Specifically, the first recess 20 is provided in the central flat portion 18 between the second recesses 14, 14, and is also provided at a position offset from the center in the Z direction (offset in the +Z direction in Figure 3). When attaching the protective refractory material 10 to the water pipe 90, the tip of the mounting bracket 80 is inserted into the first recess 20 (see also Figure 1). As a result, the central flat section 18 faces the fin 92. The size of the first recess 20 (mainly the size in the Y direction) decreases as it goes towards the depth direction (+X direction).

[0023] The second recess 14 extends along the Z direction from one end to the other of the protective refractory material 10. Each second recess 14 is provided with two protrusions 16. The protrusions 16 are spherical (hemispherical). When the protective refractory material 10 is attached to the water pipe 90, the second recess 14 faces the water pipe 90 and the protrusions 16 come into contact with the water pipe 90.

[0024] A groove 2 extends from the first recess 20 toward the end face 6 of the protective refractory material 10 in the +Z direction. As will be described in detail later, the groove 2 is used to insert a fixing member for fixing the protective refractory material 10 to the mounting bracket 80. The groove 2 extends from the middle portion of the first recess 20 in the depth direction (+X direction) toward the end face 6. The width of the groove 2 (length in the Y direction) decreases toward the first recess 20. An opening 4 is provided on the back side of the groove 2 (-X direction), extending from the end face 6 toward the first recess 20. The width of the opening 4 (length in the Y direction) is smaller than the width of the groove 2. The width of the opening 4 also decreases toward the groove 2. The first recess 20 is located on the end face 6 side of the center of the protective refractory material 10 (center of the YZ plane). At both ends of the protective refractory material 10 in the Z direction, there are inclined portions 8 whose thickness gradually increases toward the back surface 12 from the end face 6. As described above, after the protective refractory material 10 is attached to the water pipe 90, the amorphous refractory material 70 is poured from the top of the protective refractory material 10 into the gap between the protective refractory material 10 and the water pipe 90, and into the gap between the protective refractory material 10 and the fin 92. By providing inclined sections 8 at both ends of the protective refractory material 10 in the Z direction, it is possible to easily fill the gap between the water pipe 90 and the protective refractory material 10, and the gap between the water pipes 90, 90 (the gap between the protective refractory material 10 and the fin 92) with amorphous refractory material 70. The protective refractory material 10 is formed using vibration press molding technology.

[0025] The first recess 20 will be further described with reference to Figures 4 and 5. A fitting portion 22 is provided within the first recess 20, which has a larger surface dimension (YZ plane) than the other parts. The fitting portion 22 is provided at the bottom of the first recess 20 (the +X direction end). The tip of the mounting bracket 80 fits into the fitting portion 22. As is clear from Figures 4 and 5, the fitting portion 22 is provided on the surface side (+X direction side) of the protective refractory material 10 than the groove 2. In addition, a third recess 24 is provided at the bottom of the fitting portion 22, which has a smaller surface dimension (YZ plane) than the fitting portion 22.

[0026] Referring to Figure 6, the mounting bracket 80 will be described. The mounting bracket 80 consists of a stud bolt 82 and a threaded washer 84. The stud bolt 82 is an example of a shaft, and the threaded washer 84 is an example of a plate-shaped member. The stud bolt 82 and threaded washer 84 are made of stainless steel (SUS310S). One end of the stud bolt 82 is fixed to the water pipe 90 (see also Figure 1). More specifically, one end of the stud bolt 82 is welded to the fin 92 of the water pipe 90. A threaded washer 84 is attached to the other end of the stud bolt 82. By rotating the threaded washer 84, the distance from one end of the stud bolt 82 (fin 92) to the threaded washer 84 can be adjusted. When attaching the protective refractory material 10 to the water pipe 90, the threaded washer 84 fits into the fitting portion 22 (see also Figures 4 and 5). When the distance from one end of the stud bolt 82 to the threaded washer 84 is adjusted, if the other end of the stud bolt 82 protrudes from the threaded washer 84 (as shown in Figure 6), the other end of the stud bolt 82 is located within the third recess 24.

[0027] Referring to Figure 7, the fixing member 60 will be described. The fixing member 60 is flat and made of metal. As shown in (a), an engagement groove 62 that can engage with a stud bolt 82 is formed on one side 65 of the fixing member 60. That is, the width of the engagement groove 62 is greater than the diameter of the stud bolt 82. Also, the width of the engagement groove 62 is smaller than the diameter of the threaded washer 84. Therefore, the engagement groove 62 cannot engage with the threaded washer 84. A tapered portion 64 is provided at the opening of the engagement groove 62. More specifically, the tapered portion 64 is inclined in a direction that widens the opening width of the engagement groove 62. The protective refractory material 10 can be fixed to the water pipe 90 (mounting bracket 80) by inserting the mounting bracket 80 into the first recess 20 of the protective refractory material 10 and inserting the fixing member 60 from the groove 2 to engage the fixing member 60 with the mounting bracket 80. Therefore, the mounting bracket 80, protective refractory material 10, and fixing member 60 together can be considered a refractory structure for protecting the water tube 90 from the furnace environment. The width of the surface 66 of the fixing member 60 is smaller than the width of the groove 2 of the protective refractory material 10. Also, as shown in (b), the side surface 68 of the fixing member 60 is rectangular, and the thickness of the side surface 68 of the fixing member 60 is smaller than the thickness of the groove 2 of the protective refractory material 10 (see also Figure 5).

[0028] Referring to Figure 8, a construction method 50 for attaching protective refractory material 10 to the water pipe 90 will be described. For example, an example of attaching protective refractory material 10 to the part of the mounting bracket 80 in Figure 1 that is exposed will be described. First, the position of the threaded washer 84 relative to the stud bolt 82 is adjusted (adjustment step). In the adjustment step, when the protective refractory material 10 is attached to the water pipe 90, the position of the threaded washer 84 is adjusted so that the threaded washer 84 is located within the fitting part 22 when the protrusion 16 provided on the back surface of the protective refractory material 10 comes into contact with the water pipe 90 (see also Figures 3 and 4).

[0029] Next, as shown in (a), the mounting bracket 80 is inserted into the first recess 20 of the protective refractory material 10 (insertion step). In the insertion step, the protective refractory material 10 is inserted into the mounting bracket 80 so that the opening of the groove 2 is positioned upwards. In the insertion step, the protective refractory material 10 is moved straight relative to the water pipe 90 (mounting bracket 80). In other words, in the insertion step, the protective refractory material 10 is moved in a direction perpendicular to the plane on which the water pipe 90 is provided (the direction in which the mounting bracket 80 extends) to attach the protective refractory material 10 to the mounting bracket 80. The size of the first recess 20 and the size (diameter) of the stud bolt 82 are adjusted so that when the protective refractory material 10 is attached to the mounting bracket 80, there is a gap of 5 mm or more around the mounting bracket 80 (stud bolt 82).

[0030] Next, as shown in (b), the fixing member 60 is inserted into the groove 2 and engaged with the stud bolt 82 (fixing step). Specifically, when the fixing member 60 is inserted into the groove 2, the fixing member 60 moves downward due to gravity, and the stud bolt 82 fits into the engagement groove 62 of the fixing member 60. As shown in Figure 9, when the fixing member 60 is engaged with the stud bolt 82, the fixing member 60 is interposed between the central flat portion 18 of the protective refractory material 10 and the threaded washer 84, preventing the threaded washer 84 (mounting bracket 80) from coming off the protective refractory material 10 (see also Figure 3). As a result, the protective refractory material 10 is fixed to the mounting bracket 80. Note that since the fixing member 60 is provided with a tapered portion 64, the stud bolt 82 is guided into the engagement groove 62, and the fixing member 60 can be reliably engaged with the stud bolt 82 (see also Figure 7).

[0031] Subsequently, amorphous refractory material is filled into the gap between the protective refractory material 10 and the water pipe 90 (filling process). In the filling process, amorphous refractory material is filled from the top of the protective refractory material 10 (the side where the opening of groove 2 is provided). This fills the gap between the water pipe 90 and the protective refractory material 10, the gap between the protective refractory materials 10, and groove 2 with amorphous refractory material. Furthermore, by filling groove 2 with amorphous refractory material, amorphous refractory material is also filled into the gaps around the mounting bracket 80 and fixing member 60 (the gap between the mounting bracket 80 and fixing member 60 and the protective refractory material 10).

[0032] Figure 10 shows construction method 52. Construction method 52 is a modified version of construction method 50. In construction method 52, prior to the insertion step, the fixing member 60 is held near the opening of the groove 2 (end face 6 side) using a holding jig (holding step). As shown in (a), in construction method 52, with the fixing member 60 held on the end face 6 side of the groove 2, the first recess 20 of the protective refractory material 10 is inserted into the mounting bracket 80 (insertion step: see comparison with Figure 8). Then, as shown in (b), the holding jig is removed from the fixing member 60, the fixing member 60 is moved towards the mounting bracket 80, and the fixing member 60 is engaged with the stud bolt 82 (fixing step). When the holding jig is removed from the fixing member 60, the fixing member 60 moves downward due to gravity and engages with the stud bolt 82. After that, the filling step is performed in the same manner as in construction method 50. The holding jig only needs to be capable of holding the fixing member 60 in a predetermined position (on the end face 6 side of the groove 2). For example, it may be a member that can clamp the fixing member 60 and the protective refractory material 10 simultaneously, or a tape (adhesive tape) equipped with an adhesive that can adhere to the fixing member 60.

[0033] Here, with reference to Figure 15, the advantages of the protective refractory material 10 will be explained. Figure 15 shows a conventional installation method 150 for attaching protective refractory material 110 to a water pipe 90. In installation method 150, as shown in (a), the mounting bracket 80 is inserted from above (below the protective refractory material 110) into a groove (not shown) provided on the back surface of the protective refractory material 110 (insertion step). Then, as shown in (b), the protective refractory material 110 is slid downward and the mounting bracket 80 is fixed to the protective refractory material 110 (fixing step). The protective refractory material 110 is provided with a groove whose width gradually decreases. Therefore, when the protective refractory material 110 is slid downward, the mounting bracket 80 is clamped in the groove and the protective refractory material 110 is fixed to the mounting bracket 80.

[0034] In the case of conventional protective refractory materials 110, it is necessary to insert the mounting bracket 80 into the groove provided in the protective refractory material 110 and then move the protective refractory material 110 downwards. Therefore, in the construction method 150, for example, if you want to replace the protective refractory material 10a in Figure 1, it is necessary to remove the protective refractory materials 10b and 10c that are located above the protective refractory material 10a. In other words, in order to attach the protective refractory material 10a to be replaced to the water pipe 90, it is necessary to replace all protective refractory materials 10 (protective refractory materials 10b and 10c) located above the protective refractory material 10a.

[0035] In contrast, the protective refractory material 10 is moved straight relative to the water pipe 90 (mounting bracket 80) during the insertion process. Therefore, for example, if it is necessary to replace the protective refractory material 10a shown in Figure 1, it is not necessary to remove the protective refractory materials 10b and 10c. The protective refractory material 10 can reduce the maintenance time and maintenance costs when maintaining the boiler-equipped incinerator 100 (replacing the protective refractory material 10a). In addition, since the protective refractory material 10 that does not need to be replaced (protective refractory materials 10b and 10c) is not removed, the removal work and disposal costs of the removed protective refractory material 10 can also be reduced.

[0036] As described above, the protective refractory material 10 can reduce the maintenance time and maintenance costs of the boiler-equipped incinerator 100. Below, we will summarize the method for replacing some of the protective refractory materials 10 (for example, protective refractory material 10a) among the multiple protective refractory materials 10 attached to the water pipe 90.

[0037] When replacing the protective refractory material 10, the fire-resistant structure described above (a set of fixing member 60, protective refractory material 10, and fixing member 60) is used. First, the protective refractory material 10a to be replaced is removed from the water pipe 90 (protective refractory material removal process). Specifically, the protective refractory material 10a is crushed to expose the water pipe 90. In the protective refractory material removal process, any amorphous refractory material attached to the water pipe 90 is also removed. Next, the existing mounting bracket is removed from the water pipe 90, and a new mounting bracket 80 is fixed (welded) to the water pipe 90 (mounting bracket fixing process). After that, the holding process, insertion process, fixing process, and filling process described in construction method 52 are carried out. Furthermore, when replacing the protective refractory material 10, if the size of the existing protective refractory material 10a and the newly installed protective refractory material 10 are different, an adjustment process may be performed to adjust the surface size of the newly installed protective refractory material 10 based on the size of the existing protective refractory material 10a (the size of the exposed surface of the water pipe).

[0038] The following describes other advantages of the protective refractory material 10. As described above, the protective refractory material 10 is provided with a groove 2 extending from the first recess 20 toward the end face 6 of the protective refractory material 10. An opening 4 is also provided on the back side of the groove 2. Therefore, when amorphous refractory material is filled into the gap between the protective refractory material 10 and the water pipe 90, and the gap between the protective refractory material 10 and the fin 92, the groove 2 is easily filled with amorphous refractory material, and the area around the mounting bracket 80 is reliably covered with amorphous refractory material. In addition, when the protective refractory material 10 is attached to the mounting bracket 80, the size of the first recess 20 and the size of the stud bolt 82 are adjusted so that a gap of 5 mm or more is created around the stud bolt 82. Therefore, amorphous refractory material can easily move around the stud bolt 82, and the area around the stud bolt 82 can be covered with amorphous refractory material more reliably. As a result, contact between the gas (corrosive gas) generated in the boiler-equipped incinerator 100 and the mounting bracket 80 is suppressed, thereby preventing corrosion of the mounting bracket 80.

[0039] The protective refractory material 10 has inclined portions 8 at both ends in the vertical direction (Z direction). When performing the filling process, it is possible to easily move the amorphous refractory material to the back side of the protective refractory material 10 (the gap between the protective refractory material 10 and the water pipe 90).

[0040] A spherical projection 16 is provided in the second recess 14. By providing the projection 16, the contact area between the water pipe 90 and the protective refractory material 10 can be reduced. That is, surface contact between the water pipe 90 and the protective refractory material 10 can be prevented, and point contact between the water pipe 90 and the protective refractory material 10 can be made. By making point contact between the water pipe 90 and the protective refractory material 10, a gap is secured between the water pipe 90 and the protective refractory material 10, and amorphous refractory material can be reliably filled between the water pipe 90 and the protective refractory material 10. Furthermore, by making point contact between the water pipe 90 and the protective refractory material 10, it is also possible to suppress the transmission of vibrations of the water pipe 90 (vibrations that occur when water and water vapor move inside the water pipe 90) to the protective refractory material 10. By suppressing vibrations of the protective refractory material 10, it is possible to prevent the protective refractory material 10 from falling off the mounting bracket 80 or from being damaged.

[0041] Furthermore, by making the protrusion 16 spherical, it becomes easier to fill the area around the protrusion 16 with amorphous refractory material compared to, for example, a rectangular protrusion (it is possible to prevent voids from forming around the protrusion 16).

[0042] In the protective refractory material 10, the size of the first recess 20 decreases as it approaches the depth. Therefore, it is easier to insert the mounting bracket 80 into the first recess 20 during the insertion process. Also, the width of the groove 2 decreases as it approaches the first recess 20. Therefore, it is easier to insert the fixing member 60 into the groove 2 during the fixing process. Furthermore, it is easier to engage the fixing member 60 with the stud bolt 82.

[0043] The protective refractories 10a, 10b, and 10c will be described below with reference to Figures 11 to 13. Protective refractories 10a to 10c are modified versions of protective refractories 10, and for components identical to protective refractories 10, the same reference number as that assigned to protective refractories 10 will be used, and the explanation may be omitted.

[0044] In the protective refractory material 10a shown in Figure 11, the width of the opening 4a is equal to the width of the first recess 20 in the width direction (Y direction). That is, the opening 4a of the protective refractory material 10a is wider than the opening 4 of the protective refractory material 10. Therefore, it is possible to further fill the groove 2 with amorphous refractory material during the filling process. In addition, the protective refractory material 10a undergoes less shape change compared to the protective refractory material 10 (see Figure 3 for comparison). Therefore, it is possible to easily process the opening 4 and the first recess 20 of the protective refractory material 10a.

[0045] The protective refractory material 10b shown in Figure 12 has a rectangular shape (YZ plane shape) for the first recess 20b. Therefore, the processing of the first recess 20b can be made easy. Alternatively, the shape of the part for forming the first recess 20b can be made simple (rectangular). As a result, the manufacturing of the protective refractory material 10b can be made easier.

[0046] The protective refractory material 10c shown in Figure 13 does not have an opening on the back side of the groove 2. By not providing an opening on the back side of the groove 2, the manufacturing of the protective refractory material 10c can be made easier.

[0047] Next, with reference to Figure 14, the fixing member 60a will be described. The fixing member 60a is a modified example of the fixing member 60 and can be used in place of the fixing member 60 when attaching the protective refractory materials 10, 10a, 10b, and 10c to the water pipe 90. The fixing member 60a has a rib 69 at a position opposite to the side 65 where the engagement groove 62 is provided. The thickness of the fixing member 60a, including the rib 69, is smaller than the thickness of the groove 2 of the protective refractory materials 10, 10a, 10b, and 10c.

[0048] In the above embodiment, an example was described in which the protective refractory material 10 is inserted into the mounting bracket 80 with the opening of the groove 2 positioned upward during the insertion process. However, the protective refractory material 10 may also be inserted into the mounting bracket 80 with the opening of the groove 2 positioned to the side or downward. Even in this case, the fixing member 60 can be engaged with the mounting bracket 80 by using a jig that can move the fixing member 60 towards the mounting bracket 80 during the fixing process.

[0049] In the above embodiment, a mounting bracket 80 consisting of a stud bolt 82 and a threaded washer 84 was described. However, the mounting bracket only needs to consist of a shaft with one end fixed to a water pipe (fin) and a plate (plate-shaped member) that is larger in size than the shaft (more specifically, the engagement groove 62 of the fixing member 60). For example, the mounting bracket may consist of a metal round bar (shaft) and a metal plate (plate-shaped member) welded to the tip of the shaft. Furthermore, the material of the mounting bracket is also arbitrary, and the mounting bracket may be made of a metal other than stainless steel (SUS310S) as exemplified in the embodiment.

[0050] Although specific examples of the present invention have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technologies described in the claims include various modifications and changes to the specific examples illustrated above. Furthermore, the technical elements described in this specification or drawings exhibit technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technologies illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving even one of these objectives itself constitutes technical usefulness. [Explanation of Symbols]

[0051] 2: Grooves provided in protective refractory material 10:Protective refractories 20: Recesses provided in protective refractory materials 80: Mounting hardware 90: Protected member (water pipe)

Claims

1. A protective refractory used to protect a component from the furnace environment, A recess is provided on the back surface into which the tip portion of the mounting bracket fixed to the protected member is inserted. A groove extends from the aforementioned recess toward the end face in the surface direction of the protective refractory material, A protective fire-resistant material is fixed to the mounting bracket by inserting a fixing member from the groove and engaging the fixing member with the mounting bracket.

2. The protective fireproof material according to claim 1, wherein a fitting portion is provided in the recess for fitting with the tip of the mounting bracket.

3. The protective refractory material according to claim 1, wherein an opening is provided on the back side of the groove, extending from the end face in the surface direction of the protective refractory material to the recess.

4. The protective refractory material according to any one of claims 1 to 3, wherein the recess is provided on the end face side of the center of the surface of the protective refractory material.

5. A fire-resistant structure that protects the protected component from the furnace environment, A mounting bracket, one end of which is fixed to the protected member, A protective fire-resistant material having a recess on its back surface into which the other end of the mounting bracket is inserted, and a groove extending from the recess to the end face in the surface direction, A fire-resistant structure comprising a fixing member inserted from the groove and engaging with the mounting bracket to fix the mounting bracket and the protective fire-resistant material.

6. The mounting bracket is composed of a shaft and a plate-shaped member that is attached to the shaft and is larger in size than the shaft. The recess is formed such that a gap is provided between it and the shaft when the mounting bracket is inserted into the recess. The fire-resistant structure according to claim 5, wherein the fixing member has an engagement groove that can engage with the shaft but cannot engage with the plate-shaped member, and a tapered portion is provided in the opening of the engagement groove in a direction that widens the opening width.

7. A construction method for attaching a protective refractory material to a protected member in order to protect the protected member from the furnace environment, One end of the mounting bracket is fixed to the protected member. The aforementioned protective fire-resistant material has a recess on its back surface into which the other end of the mounting bracket is inserted, and a groove extending from the recess to the end face in the surface direction. An insertion step of inserting the mounting bracket into the recess, A fixing step of fixing the mounting bracket to the protective fireproof material by inserting a fixing member that can engage with the mounting bracket into the groove and engaging the fixing member with the mounting bracket, A method comprising a filling step of filling the groove with amorphous refractory material, filling the space between the protective refractory material and the protected member with amorphous refractory material, and filling the gap between the mounting bracket and the protective refractory material with amorphous refractory material.

8. The method according to claim 7, further comprising a holding step of holding the fixing member on the end face side within the groove using a holding jig prior to the insertion step.

9. The mounting bracket is composed of a shaft and a plate-shaped member that is attached to the shaft and is larger in size than the shaft. The method according to claim 7 or 8, further comprising an adjustment step of adjusting the position of the plate-shaped member with respect to the shaft prior to the insertion step.

10. A method for replacing some of the protective refractories among a plurality of protective refractories attached to a protected member in order to protect the protected member from the furnace environment, The newly installed protective fireproof material has a recess on its back surface into which the other end of the mounting bracket is inserted, and a groove extending from the recess to the end surface in the surface direction. A protective refractory removal step in which the protective refractory to be replaced is removed from the protected member, Mounting bracket fixing step: Remove the mounting bracket fixed to the protected member, and fix a new mounting bracket that can be inserted into the recess at a predetermined position on the protected member; A holding step of holding a fixing member that can engage with the mounting bracket on the end face side within the groove using a holding jig, An insertion step of inserting the mounting bracket into the groove, The fixing step involves removing the retaining jig, moving the fixing member to the mounting bracket, and engaging the fixing member with the mounting bracket to fix the mounting bracket to the protective fire-resistant material, A method comprising a filling step of filling the groove with amorphous refractory material, filling the space between the protective refractory material and the protected member with amorphous refractory material, and filling the gap between the mounting bracket and the protective refractory material with amorphous refractory material.

11. The new mounting bracket consists of a shaft and a plate-shaped member that is attached to the shaft and is larger in size than the shaft. The method according to claim 10, further comprising an adjustment step of adjusting the position of the plate-shaped member with respect to the shaft prior to the insertion step.

12. The method according to claim 10 or 11, further comprising a size adjustment step prior to the holding step, in which the surface size of the newly attached protective refractory is adjusted based on the size of the exposed surface of the protected member.

Images