Heat insulating material for combustion chamber, water heater and boiler

Abstract

To provide a heat insulating material for a combustion chamber having high heat insulation performance, capable of being attached and maintained stably and simply, and capable of performing supply at low cost.SOLUTION: A heat insulating material for a combustion chamber is a plate-shaped molded body containing inorganic fibers, where a plurality of linear grooves are formed on at least one of main surfaces, a depth of the grooves is larger than 50 μm, and the main surface on which the grooves are formed is arranged so as to face an inner wall surface of the combustion chamber.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a combustion chamber insulation material, a water heater, and a boiler. [Background technology]

[0002] 2. Description of the Related Art Boilers and water heaters are used as devices that supply steam or hot water using fuels such as petroleum.

[0003] Boilers and water heaters generate steam or hot water from water by burning fuel in a combustion chamber and transferring the heat of combustion to water through water pipes placed inside the combustion chamber.

[0004] Because the combustion chamber becomes very hot, it is usually protected by refractories and heat insulating materials in order to protect surrounding equipment from heat damage and to reduce energy loss (see, for example, Patent Documents 1 and 2).

[0005] In particular, in combustion chambers where the temperature rises due to combustion gas, refractories and heat insulating materials are generally made by pouring a fluid containing heat-resistant material onto the surface of the object to be installed and solidifying it. Such materials are also called castable materials. Although castable materials can conform to any surface shape and provide heat insulation, they have the problem of being heavy and difficult to work with during construction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4946594 [Patent Document 2] Patent No. 4640705 Summary of the Invention [Problem to be solved by the invention]

[0007] Thermal insulation materials containing inorganic fibers can be molded to a low density while maintaining voids inside, and are expected to provide higher thermal insulation effects than castable materials. Therefore, the use of thermal insulation materials containing inorganic fibers instead of castable materials is being considered, but there is a demand for thermal insulation materials installed inside combustion chambers that have improved thermal insulation performance, can be stably and easily installed and maintained, are durable, and can be supplied at low cost.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a combustion chamber insulation material which has high insulation performance, can be stably and easily installed and maintained, and can be supplied at low cost. [Means for solving the problem]

[0009] In other words, the combustion chamber insulating material of the present invention is a plate-shaped molded body containing inorganic fibers, characterized in that it has a plurality of linear grooves formed on at least one of its main surfaces, the depth of the grooves being greater than 50 μm, and the main surface on which the grooves are formed is arranged facing the inner wall surface of the combustion chamber. The combustion chamber insulation material of the present invention has a plurality of linear grooves formed on at least one of its main surfaces, and the main surface on which the grooves are formed is arranged facing the inner wall surface of the combustion chamber. Since a certain space can be secured between the main surface on which the grooves of the combustion chamber insulation material are formed and the inner wall surface of the combustion chamber, an air layer is formed on the inner wall surface side of the combustion chamber, enhancing the insulation effect, and reducing the contact area between the combustion chamber insulation material and the inner wall surface of the combustion chamber, thereby suppressing heat conduction to the inner wall surface of the combustion chamber. Furthermore, since the combustion chamber insulation material of the present invention has a plurality of linear grooves formed on at least one of its main surfaces, it can be attached so that the surface shape of the main surface follows the inner wall surface of the combustion chamber. Therefore, high insulation and stable attachment can be achieved at the same time.

[0010] In the combustion chamber insulating material of the present invention, the region in which the grooves are formed preferably occupies 80% or more of the main surface that is placed on the inner wall surface of the combustion chamber. By forming the grooves in an area that occupies 80% or more of the main surface that is placed on the inner wall surface of the combustion chamber, high thermal insulation properties and stable installation can be achieved at the same time.

[0011] In the combustion chamber insulating material of the present invention, the grooves preferably have an interval of 25 mm or less. By keeping the groove spacing within 25 mm, more grooves can be formed on the main surface, ensuring a certain space between the main surface of the combustion chamber insulation material and the inner wall surface of the combustion chamber, thereby improving the insulating effect on the inner wall surface of the combustion chamber.

[0012] In the combustion chamber insulating material of the present invention, the groove preferably has a width of 0.1 mm or more. By making the groove width 0.1 mm or more, a certain space can be secured between the main surface of the combustion chamber insulation material and the inner wall surface of the combustion chamber, thereby improving the insulating effect on the inner wall surface of the combustion chamber.

[0013] In the combustion chamber insulating material of the present invention, the grooves preferably form a regular pattern. Because the grooves form a regular pattern, a constant space can be evenly secured between the main surface of the combustion chamber insulation material and the inner wall surface of the combustion chamber, thereby improving the insulating effect on the inner wall surface of the combustion chamber.

[0014] In the combustion chamber insulating material of the present invention, a plurality of the grooves are preferably formed so as to intersect with each other. By having a plurality of grooves intersecting each other, it is possible to prevent stress from being biased in one direction, and the combustion chamber insulating material of the present invention can be attached to the inner wall surface of the combustion chamber more stably.

[0015] The combustion chamber insulating material of the present invention is preferably formed by a papermaking method. Combustion chamber insulation material formed by the papermaking method is primarily composed of inorganic fibers, and unlike castable materials which are primarily composed of inorganic particles, it has a low density, is lightweight, has high insulating properties, and is less likely to crack due to thermal shock or vibration.

[0016] The water heater of the present invention comprises a combustion chamber, a heat exchanger installed within the combustion chamber, and the combustion chamber insulation material of the present invention, and is characterized in that the main surface of the combustion chamber insulation material on which grooves are formed is arranged facing the inner wall surface of the combustion chamber.

[0017] The water heater of the present invention is equipped with the combustion chamber insulating material of the present invention, and a plurality of linear grooves are formed on at least one main surface of the combustion chamber insulating material, thereby ensuring a certain space between the main surface of the combustion chamber insulating material and the inner wall surface of the combustion chamber, thereby improving the insulating effect on the inner wall surface of the combustion chamber. In addition, since the combustion chamber insulating material of the present invention is made of inorganic fibers, air is contained between the inorganic fibers, so that the insulating effect is high and the CO 2 It has excellent emission suppression effect.

[0018] The boiler of the present invention is characterized in that it comprises a combustion chamber and the combustion chamber insulation material of the present invention, and the main surface of the combustion chamber insulation material on which grooves are formed is arranged facing the inner wall surface of the combustion chamber.

[0019] The boiler of the present invention is equipped with the combustion chamber insulating material of the present invention, and a plurality of linear grooves are formed on at least one of the main surfaces, so that a certain space can be secured between the main surface of the combustion chamber insulating material and the inner wall surface of the combustion chamber, and the insulating effect on the inner wall surface of the combustion chamber can be improved. In addition, since the combustion chamber insulating material of the boiler of the present invention is formed of inorganic fibers, air is contained between the inorganic fibers, so that the insulating effect is high, and the CO 2 It has excellent emission suppression effect. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view that illustrates an example of a combustion chamber insulating material of the present invention. [Diagram 2] FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG. 1, showing a schematic internal structure of the combustion chamber insulating material. [Diagram 3] FIG. 3 is a schematic diagram showing a method for measuring the depth, spacing and width of grooves in the combustion chamber insulating material of the present invention. [Figure 4] FIG. 4 is a perspective view that illustrates a schematic view of another example of the insulating material for a combustion chamber of the present invention. [Diagram 5] FIG. 5 is an enlarged cross-sectional view taken along line BB of FIG. 4, showing a schematic internal structure of the combustion chamber insulating material. [Figure 6] FIG. 6 is a perspective view that typically illustrates an example of a process for producing the combustion chamber insulating material of the present invention. [Figure 7] FIG. 7 is a perspective view that typically shows a punching plate used in producing the combustion chamber insulating material of the present invention. [Figure 8] FIG. 8 is a cross-sectional view that illustrates an example of a water heater of the present invention. [Figure 9] FIG. 9 is a cross-sectional view that illustrates an example of a boiler of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing an example of a sample for measuring the depth, interval and width of grooves in the thermal insulating material for a combustion chamber of the present invention.

[0021] Detailed Description of the Invention [Insulation material for combustion chamber] First, the combustion chamber insulating material of the present invention will be described. The combustion chamber insulating material of the present invention is characterized in that it comprises a plate-like molded body containing inorganic fibers, has a plurality of linear grooves formed on at least one of its main surfaces, the depth of the grooves being greater than 50 μm, and the main surface on which the grooves are formed is arranged facing the inner wall surface of the combustion chamber.

[0022] In this specification, the term "plate-like" refers to a shape having two opposing main surfaces with relatively large areas and a side surface connecting the two main surfaces. The direction in which the two main surfaces extend is also called the surface direction, and the direction connecting the two main surfaces is also called the thickness direction. At least one of the two opposing main surfaces may be curved.

[0023] (First embodiment) FIG. 1 is a perspective view that illustrates an example of a combustion chamber insulating material of the present invention. A combustion chamber insulating material 1 shown in FIG. 1 is composed of a plate-like molded body 10 containing inorganic fibers. The plate-like molded body 10 has a plate-like shape having first and second main surfaces 10a and 10b that face each other and have relatively large areas, and a side surface 10c that connects the first and second main surfaces 10a and 10b.

[0024] The first main surface 10a and the second main surface 10b have a substantially circular shape when viewed from the thickness direction z. Therefore, the outer shape of the plate-like molded body 10 and the combustion chamber insulating material 1 can be said to be a disk shape having a predetermined thickness.

[0025] The combustion chamber insulating material of the present invention preferably has a flat or curved shape. With the above-mentioned shape, the combustion chamber insulating material of the present invention can be disposed at various locations inside the combustion chamber. The shape of the combustion chamber insulating material is the shape of the plate-shaped molded body.

[0026] Since the combustion chamber insulating material 1 is composed only of the plate-shaped molded body 10, the plate-shaped molded body 10 can be said to be the combustion chamber insulating material 1. That is, in the combustion chamber insulating material of the present invention, the plate-like molded body itself may be the combustion chamber insulating material.

[0027] The thickness of the plate-shaped molded body is preferably 1 to 10 cm. The thickness of the plate-shaped molded body is a value measured in a portion where no grooves are formed (t in FIG. 2 described later). When the thickness of the plate-shaped molded body is within the above range, it can exhibit sufficient heat insulating properties as a heat insulating material.

[0028] The area of ​​the plate-shaped molded body as viewed from the thickness direction z (planar area) is 350 to 15,000 cm 2 It is preferable that:

[0029] The volume of the plate-shaped molded body is 700 to 150,000 cm 3 When the volume of the plate-like molded article is within the above range, breakage due to thermal shrinkage is particularly unlikely to occur.

[0030] The plate-like molded body contains inorganic fibers. The inorganic fibers preferably include at least one selected from the group consisting of biosoluble fibers, alumina fibers, rock wool, and glass fibers. As the biosoluble fiber, for example, alkaline earth silicate fiber (AES fiber) can be used. Also, shot components of non-fibrous particles may be contained. When the inorganic fibers contain the above-mentioned material, a plate-shaped molded product having excellent heat resistance can be obtained.

[0031] The combustion chamber insulation material 1 is made of a plate-shaped molded body 10 containing inorganic fibers, so it has a smaller weight per volume and is easier to work with than castable materials. The plate-shaped molded body 10 has the property of being less prone to deformation with less localized bias of the inorganic fibers, making it suitable as an insulation material to be placed inside a combustion chamber.

[0032] The plate-shaped molded body may be a paper molded body or a needle body. The paper molded body is a molded body obtained by pouring a slurry containing inorganic fibers into a molding die, and performing paper molding and drying (papermaking method) by suction dehydration. The plate-shaped molded body obtained by the papermaking method is also called a plate-shaped paper molded body. The needle body is a molded body obtained by subjecting an inorganic fiber aggregate to a needling treatment, and the plate-shaped molded body obtained by the needling treatment is also called a plate-shaped needle body.

[0033] The combustion chamber insulating material is preferably one formed by a papermaking method. Since the combustion chamber insulating material formed by the papermaking method is mainly composed of inorganic fibers, unlike castable materials mainly composed of inorganic particles, it has a low density, is lightweight, has high insulating properties, and is less likely to crack due to thermal shock or vibration.

[0034] The average fiber diameter of the inorganic fibers is not particularly limited, but is preferably 2.0 to 15.0 μm when the plate-shaped molded product is a paper product. When the average fiber diameter of the inorganic fibers is within the above range, a dense plate-shaped molded product with little localized distribution of the inorganic fibers can be obtained.

[0035] The average fiber length of the inorganic fibers is not particularly limited, but is preferably 0.05 to 3.0 mm when the plate-shaped molded product is a paper product. When the average fiber length of the inorganic fibers is within the above range, a plate-shaped molded product can be obtained in which the inorganic fibers are laminated with little local bias, and the heat insulation properties are stable.

[0036] As shown in Fig. 1, the combustion chamber insulating material 1 has a plurality of y-direction grooves 21 and a plurality of x-direction grooves 22 formed over the entirety (100%) of the first main surface 10a. In the combustion chamber insulating material 1 shown in Fig. 1, the grooves 21, 22 are continuous straight lines. In the combustion chamber insulating material of the present invention, the grooves may be discontinuous broken lines or dotted lines.

[0037] In the combustion chamber insulating material 1 shown in Fig. 1, the grooves 21 and 22 intersect at right angles. In the combustion chamber insulating material of the present invention, the multiple grooves do not have to intersect at right angles, and may intersect at, for example, 45°. It is preferable that the combustion chamber insulating material of the present invention is formed so that the multiple grooves intersect. By having the multiple grooves intersect, it is possible to prevent stress from being biased in one direction, and the combustion chamber insulating material of the present invention can be attached more stably to the inner wall surface of the combustion chamber.

[0038] In the combustion chamber insulating material of the present invention, the grooves may be curved. In the combustion chamber insulating material of the present invention, the grooves may be formed not only in the first main surface but also in the second main surface.

[0039] FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG. 1, showing a schematic internal structure of the combustion chamber insulating material. As shown in FIG. 2, the groove 21 has a semicircular cross-sectional shape. The depth of the groove 21 (indicated by a double-headed arrow d in FIG. 2) 21 The length indicated by (length indicated by ) is greater than 50 μm. The depth of groove 21 is preferably greater than 80 μm. The depth of groove 22 (not shown) is also greater than 50 μm, preferably greater than 80 μm. If the depth of grooves 21, 22 is greater than 50 μm, a sufficient space is formed between the inner wall surface of the combustion chamber and the combustion chamber insulation material, forming an air layer to enhance the insulation effect, reduce the contact area between the combustion chamber insulation material and the inner wall surface of the combustion chamber, and suppress heat conduction to the inner wall surface of the combustion chamber. The depth of the groove is preferably, for example, 5 mm or less, and may be 2 mm or less.

[0040] Furthermore, the spacing between grooves 21 (the length indicated by the double-headed arrow g in FIG. 2) is preferably 25 mm or less. The spacing between grooves 22 (not shown) is also preferably 25 mm or less. By setting the spacing between grooves 21, 22 to 25 mm or less, more grooves can be formed on the main surface, a certain amount of space can be secured between the main surface of the combustion chamber insulation material and the inner wall surface of the combustion chamber, and the insulating effect on the inner wall surface of the combustion chamber can be improved. The distance g between the grooves 21 and 22 is preferably, for example, 0.1 mm or more.

[0041] Moreover, the width of groove 21 (the length indicated by the double-headed arrow W in FIG. 2) and the width of groove 22 (not shown) are preferably 0.1 mm or more. By making the groove width 0.1 mm or more, a certain space can be further secured between the main surface of the combustion chamber insulation material and the inner wall surface of the combustion chamber, and the insulation effect on the inner wall surface of the combustion chamber can be improved. The width of the grooves 21, 22 is preferably, for example, 25 mm or less.

[0042] In the combustion chamber insulating material 1, the portion surrounded by the grooves 21, 22 forms a protruding portion .

[0043] Fig. 3 is a schematic diagram showing the procedure for measuring the depth, interval and width of the grooves of the heat insulating material for a combustion chamber of the present invention. As shown in Fig. 3, when the boundary between the groove 21 and the protrusion 23 is unclear, the depth of the groove is measured by drawing a straight line passing through the highest part of the adjacent protrusions, drawing a line perpendicular to the straight line toward the groove, and calculating the length of the longest point as the depth d of the groove. 1 5 places (d 1 ~d 5 ) measurements are taken and the average value is regarded as the groove depth of the combustion chamber insulation material. The interval between the grooves 21 is a dimension g between the two ends of the positions where the inclination angle of the side shape of the groove from the bottom of the groove 21 toward the adjacent convex portion 23 is less than 45° with respect to the horizontal plane (xy plane). 1 5 places (g 1 ~g 5 ) measurements are taken and the average value is used as the groove spacing for that combustion chamber insulation material. The width of the groove 21 is dimension g 1 and g 2The dimension between 2 And 5 places (W 1 ~W 5 ) shall be the width of the groove of the combustion chamber insulation material.

[0044] As shown in Fig. 1, the combustion chamber insulating material 1 has grooves 21, 22 that form a lattice pattern over the entire first main surface 10a. In Fig. 1, the lattice pattern is formed by grooves 21, 22 intersecting at right angles. For example, when grooves 21, 22 intersect at 45°, a diamond pattern is formed. In the combustion chamber insulating material of the present invention, the grooves preferably form a regular pattern, which can ensure a constant and uniform space between the main surface of the combustion chamber insulating material and the inner wall surface of the combustion chamber, thereby improving the insulating effect on the inner wall surface of the combustion chamber.

[0045] The combustion chamber insulating material preferably has an area in which the grooves are formed that is 80% or more of the main surface that is to be placed on the inner wall surface of the combustion chamber. By having the area in which the grooves are formed that is 80% or more of the main surface that is to be placed on the inner wall surface of the combustion chamber, both high insulation properties and stable installation can be achieved.

[0046] The combustion chamber insulation material of the present invention is arranged such that the main surface on which the grooves are formed faces the inner wall surface of the combustion chamber. Since a certain space can be secured between the main surface on which the grooves of the combustion chamber insulation material are formed and the inner wall surface of the combustion chamber, an air layer can be formed on the inner wall surface side of the combustion chamber to enhance the insulation effect, and the contact area between the combustion chamber insulation material and the inner wall surface of the combustion chamber can be reduced, thereby suppressing heat conduction to the inner wall surface of the combustion chamber. Furthermore, since the combustion chamber insulation material has a plurality of linear grooves formed on at least one of its main surfaces, it can be installed so that the surface shape fits the inner wall surface of the combustion chamber. Therefore, high insulation and stable installation can be achieved at the same time.

[0047] The plate-like molded body may be provided with holes penetrating in the thickness direction z. By forming such holes, it becomes easier to cover the inner wall surface of the combustion chamber in which piping such as water pipes and smoke pipes are arranged.

[0048] The plate-like molded product may contain components other than the inorganic fibers, such as inorganic particles, inorganic binders, organic binders, and coagulants.

[0049] Examples of inorganic particles include silica particles, alumina particles, titania particles, zirconia particles, and natural mineral particles. Examples of the inorganic binder include silica sol, alumina sol, titania sol, zirconia sol, and fumed silica. Examples of the organic binder include polyvinyl alcohol, starch, acrylic resin, and polyacrylamide.

[0050] The weight ratio of the inorganic fibers in the plate-like molded product is preferably 30 to 97% by weight.

[0051] Next, a combustion chamber insulating material 2, which is another example of the combustion chamber insulating material, will be described below with reference to Figures 4 and 5. Here, only the points that differ from the combustion chamber insulating material 1 will be described.

[0052] Fig. 4 is a perspective view showing a schematic diagram of another example of the thermal insulation material for a combustion chamber of the present invention, and Fig. 5 is a cross-sectional view taken along line BB showing a schematic diagram of an enlarged internal structure of the thermal insulation material for a combustion chamber in Fig. 4. As shown in FIGS. 4 and 5, the combustion chamber heat insulating material 2 has a depth of the groove 21 (indicated by a double-headed arrow d in FIG. 5). 22 5) are the same dimensions. As shown in FIG. 5, groove 21 has a rectangular cross-sectional shape. The width of groove 21 (the length indicated by the double-headed arrow W in FIG. 5) is slightly smaller than the interval between grooves 21. The depth of groove 21, the interval between grooves 21, and the width of groove 21 may all be the same dimensions. The depth, interval, and width of groove 22 (all not shown) may be the same as or different from the depth, interval, and width of groove 21, but it is preferable that the depth of groove 21 and the depth of groove 22 are the same.

[0053] The method for producing the combustion chamber insulating material of the present invention is not particularly limited, but it can be produced, for example, by the following procedure. A method for producing the combustion chamber insulating material 1 will be described below with reference to FIG. FIG. 6 is a perspective view that typically illustrates an example of a process for producing the combustion chamber insulating material of the present invention. Step (1) A slurry containing water, inorganic fibers, an inorganic binder, an organic binder and a flocculant is prepared, and a raw sheet 30 of a combustion chamber insulating material is obtained by a papermaking method. Step (2) After papermaking, the original sheet 30 containing moisture is removed from the mold and placed on a SUS metal plate 40, and a stainless steel wire mesh 50 having the same length and width as the SUS metal plate 40 is placed on the original sheet 30. At this time, the mesh number and wire diameter of the stainless steel wire mesh 50 are selected so that the depth, groove interval, and groove width of the grooves formed in the combustion chamber insulation material to be manufactured are the desired dimensions. Step (3): Next, another SUS metal plate 40 is placed on the stainless steel wire mesh, and the original sheet 30 is dried at 150° C. for 1 hour while being compressed to a desired thickness. After drying, the SUS metal plate 40 and the stainless steel wire mesh 50 are removed, and the combustion chamber insulating material 1 can be obtained.

[0054] The insulation material for a combustion chamber according to the invention can also be produced by a different procedure. In the following, a method for producing the insulation material for a combustion chamber 2 is described. Step (1) A slurry containing water, inorganic fibers, an inorganic binder, an organic binder and a flocculant is prepared. Step (2): A metal plate (such as a stainless steel punched plate with regularly-spaced through holes) for forming grooves on the main surface of the original sheet is placed on the bottom of the molding die, and the slurry liquid is poured into the molding die to obtain an original sheet of combustion chamber insulation material by a papermaking method. Step (3) After papermaking, if necessary, a metal plate or the like is placed on the top surface of the original sheet and compressed to adjust the thickness of the original sheet, the original sheet containing moisture is removed from the mold, placed on a stainless steel metal plate with the main surface without grooves facing down, and dried at 150° C. for 1 hour. After drying, the stainless steel metal plate is removed, and the combustion chamber insulation material 2 can be obtained.

[0055] An example of the SUS punched plate used in step (2) is one in which square through holes 62 are regularly arranged, as shown in FIG. 7. FIG. 7 is a perspective view that shows a schematic view of a punched plate used in producing the combustion chamber insulating material of the present invention. The shape of the through holes is not limited to a square, and may be rectangular or rhombic. In the punched plate 60 of FIG. 7, the width of the plate portion 61 is slightly narrower than the through holes 62. The width of the plate portion 61 may be greater than the through holes 62. Moreover, the width of the through holes 62 and the plate portion 61 may be the same.

[0056] The above describes a method for forming grooves in an original sheet after papermaking, and a method for providing grooves when the original sheet is papermade. However, it is also possible to produce a dry plate-shaped molded body without grooves by a known method, and then provide grooves by processing with a blade or using a laser, etc.

[0057] The heat insulating material for a combustion chamber of the present invention can be used, for example, in an apparatus equipped with a combustion chamber, such as a water heater or a boiler.

[0058] [Water heater] The water heater of the present invention comprises a combustion chamber, a heat exchanger installed within the combustion chamber, and the combustion chamber insulation material of the present invention, and is characterized in that the main surface of the combustion chamber insulation material on which grooves are formed is positioned facing the inner wall surface of the combustion chamber. The water heater of the present invention is equipped with the combustion chamber insulating material of the present invention, and a plurality of linear grooves are formed on at least one main surface of the combustion chamber insulating material, thereby ensuring a certain space between the main surface of the combustion chamber insulating material and the inner wall surface of the combustion chamber, thereby improving the insulating effect on the inner wall surface of the combustion chamber. In addition, since the combustion chamber insulating material of the present invention is made of inorganic fibers, air is contained between the inorganic fibers, so that the insulating effect is high and the CO 2 It has excellent emission suppression effect.

[0059] An example of a water heater according to the present invention will be described below. FIG. 8 is a cross-sectional view that illustrates an example of a water heater of the present invention. The water heater 500 has a combustion chamber 540 and a heat exchanger 170 disposed within the combustion chamber 540 . The combustion chamber 540 has a metal container 150 and two combustion chamber insulation materials 1 arranged on a top surface 150a and a bottom surface 150b of the metal container. The combustion chamber insulation material 1 is arranged such that a first main surface 10a faces the inner wall surface of the combustion chamber. Water flows in heat exchanger 170, and the water in heat exchanger 170 is heated in combustion chamber 540 to become hot water (hot water), and the hot water (hot water) is supplied to the outside of water heater 500.

[0060] The temperature of the hot water supplied can be appropriately adjusted by adjusting the amount of fuel burned in the combustion chamber and the amount of water passing through the heat exchanger per unit time.

[0061] [boiler] The boiler of the present invention is characterized in that it comprises a combustion chamber and the combustion chamber insulation material of the present invention, and the main surface of the combustion chamber insulation material on which grooves are formed is arranged facing the inner wall surface of the combustion chamber. The boiler of the present invention is equipped with the combustion chamber insulating material of the present invention, and a plurality of linear grooves are formed on at least one of the main surfaces, so that a certain space can be secured between the main surface of the combustion chamber insulating material and the inner wall surface of the combustion chamber, thereby improving the insulating effect on the inner wall surface of the combustion chamber. In addition, since the combustion chamber insulating material of the boiler of the present invention is formed of inorganic fibers, air is contained between the inorganic fibers, so that the insulating effect is high, and the CO 2 It has excellent emission suppression effect.

[0062] An example of a boiler according to the present invention will now be described. FIG. 9 is a cross-sectional view that illustrates an example of a boiler of the present invention. The boiler 600 includes a combustion chamber 550 and water tubes 180 disposed within the combustion chamber 550 . The combustion chamber 550 has a metal container 160 and two combustion chamber insulation materials 1 arranged on a top surface 160a and a bottom surface 160b of the metal container. The combustion chamber insulation material 1 is arranged such that a first main surface 10a faces the inner wall surface of the combustion chamber. Water is supplied into the water pipe 180 from the lower part of the combustion chamber 550 , and the water passing through the water pipe 180 is heated in the combustion chamber 550 to become steam, which is discharged from the upper part of the combustion chamber 550 . The discharged water vapor is used for power generation, heating, cleaning, cooking, drying, disinfection, sterilization, etc. after separating the liquid water or superheating as necessary.

[0063] The method for arranging the combustion chamber insulating material on the inner wall surface of the combustion chamber is not particularly limited, and for example, it can be fixed with bolts and nuts. The first main surface portion of the combustion chamber insulating material may be arranged on the inner wall surface of the combustion chamber via an inorganic adhesive.

[0064] The present specification discloses the following:

[0065] The present disclosure (1) is a combustion chamber insulating material which is a plate-like molded body containing inorganic fibers, and which is characterized in that a plurality of linear grooves are formed on at least one main surface, the grooves having a depth greater than 50 μm, and the main surface on which the grooves are formed is disposed facing the inner wall surface of the combustion chamber.

[0066] The present disclosure (2) is the combustion chamber insulating material according to the present disclosure (1), in which the area in which the grooves are formed is 80% or more of the main surface disposed on the inner wall surface of the combustion chamber.

[0067] The present disclosure (3) is the combustion chamber insulating material according to the present disclosure (1) or (2), in which the grooves are spaced apart from one another by 25 mm or less.

[0068] The present disclosure (4) is the combustion chamber insulating material according to any one of the present disclosures (1) to (3), in which the groove has a width of 0.1 mm or more.

[0069] The present disclosure (5) is the combustion chamber insulating material according to any one of the present disclosures (1) to (4), in which the grooves form a regular pattern.

[0070] The present disclosure (6) is the combustion chamber insulating material according to any one of the present disclosures (1) to (5), in which a plurality of the grooves are formed so as to intersect with each other.

[0071] The present disclosure (7) is a combustion chamber insulating material according to any one of the present disclosures (1) to (6), which is formed by a papermaking method.

[0072] The present disclosure (8) is a water heater comprising a combustion chamber, a heat exchanger installed in the combustion chamber, and a combustion chamber insulation material described in any one of the present disclosures (1) to (7), characterized in that a main surface of the combustion chamber insulation material on which grooves are formed is arranged facing an inner wall surface of the combustion chamber.

[0073] The present disclosure (9) is a boiler comprising a combustion chamber and a combustion chamber insulation material according to any one of the present disclosures (1) to (7), wherein a main surface of the combustion chamber insulation material on which grooves are formed is disposed facing an inner wall surface of the combustion chamber.

[0074] (Example) EXAMPLES Hereinafter, examples that more specifically disclose the present invention will be described, however, the present invention is not limited to these examples.

[0075] Example 1 Water, AES fiber, inorganic binder (silica sol), organic binder (acrylate-based latex) and coagulant (aluminum sulfate) were added to a commercially available pulper and dispersed to prepare a slurry liquid. The prepared slurry liquid was poured into a mold, dehydrated, and a prototype sheet was obtained by a papermaking method. The thickness of the prototype sheet was 38 mm. A 200-mesh stainless steel wire mesh was used as the mold. The prototype sheet was removed from the mold and placed on a Teflon (registered trademark)-coated SUS metal plate, and a 50-mesh stainless steel wire mesh (wire diameter 0.22 mm) with the same length and width as the prototype sheet was placed on the prototype sheet. A Teflon-coated SUS metal plate was further placed on the stainless steel wire mesh, and the thickness of the prototype sheet was adjusted to 25 mm, and it was dried at 150 ° C for 1 hour to obtain a plate-shaped molded product.

[0076] Example 2 A plate-like molded product was obtained in the same manner as in Example 1, except that a 100-mesh stainless steel wire mesh (wire diameter 0.1 mm) was placed on the original sheet instead of the 50-mesh stainless steel wire mesh.

[0077] Example 3 A plate-like molded product was obtained in the same manner as in Example 1, except that a 10-mesh stainless steel wire mesh (wire diameter 1.0 mm) was placed on the original sheet instead of the 50-mesh stainless steel wire mesh.

[0078] Example 4 A plate-like molded product was obtained in the same manner as in Example 1, except that a 3-mesh stainless steel wire mesh (wire diameter 1.9 mm) was placed on the original sheet instead of the 50-mesh stainless steel wire mesh.

[0079] Example 5 Water, AES fiber, inorganic binder (silica sol), organic binder (acrylate-based latex), and coagulant (aluminum sulfate) were added to a commercially available pulper and dispersed to prepare a slurry. A metal plate (SUS punching plate, opening dimensions: 5mm x 5mm square, opening interval: 5mm length, 5mm width, 5mm thickness) for forming grooves on the main surface of the original sheet was placed on the bottom of the molding die, the slurry was poured into the molding die, dehydrated, and a original sheet was obtained by a papermaking method. After placing a Teflon-coated SUS metal plate on the original sheet to adjust the thickness, the original sheet was removed from the die, placed on the Teflon-coated SUS metal plate so that the main surface side without the grooves was facing down, and dried at 150°C for 1 hour to obtain a plate-shaped molded product. The thickness of the plate-shaped molded product was 25mm.

[0080] Example 6 A plate-like molded product was obtained in the same manner as in Example 5, except that a SUS punched plate (opening dimensions: 20 mm×20 mm square, opening intervals: 20 mm length, 20 mm width, 5 mm thickness) was used as the metal plate.

[0081] Comparative Example 1 A 30 mm thick original sheet was obtained in the same manner as in Example 1. The obtained original sheet was placed on a plate shelf in a dryer and dried at 150°C for 3 hours to obtain a plate-shaped molded product with a thickness of 38 mm. The original sheet was removed from the mold and placed on a Teflon (registered trademark)-coated SUS metal plate, and another Teflon-coated SUS metal plate was placed on top to adjust the thickness of the original sheet to 25 mm, and dried at 150°C for 1 hour to obtain a plate-shaped molded product.

[0082] Comparative Example 2 A plate-like molded product was obtained in the same manner as in Example 1, except that a 200-mesh stainless steel wire mesh (wire diameter: 0.05 mm) was placed on the original sheet instead of the 50-mesh stainless steel wire mesh.

[0083] (Measurement of groove depth, spacing and width) As shown in FIG. 10, the plate-shaped molded body 10 produced in Examples 1 to 6 and Comparative Examples 1 to 2 was cut at the position of the cutting line CL with a commercially available cutter to obtain a measurement sample 15. The sample dimensions were 25 to 100 mm in length and 5 to 20 mm in width. FIG. 10 is a schematic diagram showing an example of a sample for measuring the depth, interval, and width of the grooves of the combustion chamber insulating material of the present invention. As shown in FIG. 10, the plate-shaped molded body 10 was cut at the position of the cutting line CL passing through the convex portion 23 to obtain a measurement sample 15. Even if the boundary between the grooves 21, 22 and the convex portion 23 was unclear, the plate-shaped molded body 10 was cut at a position that passed through the convex portion 23 as much as possible. The groove depth, spacing and width were measured according to the procedure for measuring the groove depth, spacing and width of the combustion chamber insulating material of the present invention, which was described above with reference to FIG. The measurements were made by enlarging and observing the upper part of the cut surface in the length direction with an optical camera. When taking an enlarged photograph of the side of the measurement sample 15 with an optical digital camera (Nikon Corporation, COOLPIX A100), a ruler (Shinwa Measurement Co., Ltd., product name: stainless steel ruler 15 cm with red numbers JIS) was simultaneously photographed, and the distance was measured on the image. If any of the groove depth, interval, and width was smaller than 1000 μm, it was observed with an optical microscope (Keyence Corporation, Digital Microscope VHX-2000), and the groove depth, interval, and width were measured using the attached image software. The measurement criteria results are shown in Table 1.

[0084] (Insulation rating) The heat insulating properties of the plate-like molded articles of Examples 1 to 6 and Comparative Examples 1 and 2 were evaluated by the following method. A heating plate (Inconel: registered trademark) with an embedded heater to reproduce the temperature conditions in the combustion chamber and a stainless steel plate were prepared, and the plate-shaped molded body was sandwiched and fixed between these two plates. The plate-shaped molded bodies of Examples 1 to 6 and Comparative Example 2 were arranged so that the main surface on which the grooves were formed was in contact with the stainless steel plate. The heating plate was heated to 1000°C and maintained at that temperature for 10 minutes. Thereafter, the temperature of the stainless steel plate on the surface in contact with the plate-shaped molded body was measured. The results are shown in Table 1.

[0085] [Table 1]

[0086] As shown in Table 1, the insulating materials of Examples 1 to 6, in which grooves more than 50 μm deep are formed across the entire main surface of the plate-shaped molded body, had superior insulating properties compared to the insulating material of Comparative Example 1, in which no grooves were formed, and the insulating material of Comparative Example 2, in which the grooves were 50 μm deep or less. [Explanation of symbols]

[0087] 1, 2 Combustion chamber insulation 10 Plate-shaped molded body 10a: First main surface of plate-shaped body 10b: second main surface of plate-shaped body 10c Side of plate-shaped molded body 15 Measurement sample 21, 22 groove 23 Convex 30 Original Sheet 40 SUS metal plate 50 Stainless steel wire mesh 60 Punching Plate 61 Board part 62 Through hole 150, 160 metal container 150a, 160a Top surface of metal container 150b, 160b Bottom surface of metal container 170 Heat exchanger 180 Water pipe 540, 550 combustion chamber 500 Water Heater 600 Boiler CL cutting line

Claims

1. A plate-like molded body containing inorganic fibers, A plurality of linear grooves are formed on at least one of the main surfaces, The depth of the groove is greater than 50 μm, A combustion chamber insulating material, characterized in that the main surface on which the grooves are formed is arranged facing the inner wall surface of the combustion chamber.

2. 2. The heat insulating material for a combustion chamber according to claim 1, wherein an area in which the grooves are formed is 80% or more of a main surface disposed on the inner wall surface of the combustion chamber.

3. 2. The combustion chamber insulating material according to claim 1, wherein the grooves are spaced apart from one another by 25 mm or less.

4. 2. The combustion chamber insulating material according to claim 1, wherein the groove has a width of 0.1 mm or more.

5. 2. The combustion chamber insulation of claim 1, wherein said grooves form a regular pattern.

6. The combustion chamber insulating material according to claim 5 , wherein a plurality of said grooves are formed so as to intersect with each other.

7. 2. The combustion chamber insulating material according to claim 1, which is formed by a papermaking method.

8. A combustion chamber; A heat exchanger installed in the combustion chamber; The combustion chamber insulating material according to any one of claims 1 to 7, A water heater characterized in that a main surface of the combustion chamber insulation material on which grooves are formed is arranged facing an inner wall surface of the combustion chamber.

9. A combustion chamber; The combustion chamber insulating material according to any one of claims 1 to 7, A boiler characterized in that the main surface of the combustion chamber insulation material on which the grooves are formed is arranged facing the inner wall surface of the combustion chamber.

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