JP7267330B2 - Refractory unit for regenerative burner and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a burner refractory, a method for manufacturing a burner refractory, a regenerative burner, and an industrial furnace equipped with a regenerative burner.

Burner tiles, which are resistant to chemical substances, surround a burner that is mounted on and inserted into the ceiling or side wall of an industrial furnace such as a heating furnace or a heat treatment furnace. For example, a refractory for a regenerative burner installed on the ceiling is often attached to a relatively large casing such as 1m x 1.5m. In addition, one refractory has a plurality of through-holes that penetrate inside and outside the furnace, such as fuel injection holes and air holes for combustion air, and the angle of the through-holes is perpendicular to the furnace wall in the direction of the inside and outside of the furnace. Instead, it is often angled.

Castable is conventionally used as a refractory material for these applications, but burner tiles made of castable have low thermal shock resistance and are prone to cracking. Especially when it comes to large burner tiles, cracks are more likely to occur. In recent years, from the viewpoint of energy saving, fiber refractory materials are often used for ceilings other than burner tiles. Due to the difference, castable burner tiles are more likely to crack, and castable burner tiles may crumble and fall. There is a demand for converting verna tiles into fibers as soon as possible, because heavy verna tile fragments falling from the ceiling can endanger human lives.

In Patent Document 1, ceramic fiber blankets are laminated in a cross, radial or mosaic shape, and fibers of the ceramic fiber blanket are inserted into a trumpet-shaped or cylindrical burner insertion hole formed in the central part of the burner tile and widening on the inner surface side of the furnace. Ceramic fiber burner tiles with locating tips are described.

Patent Literature 2 describes a fibrous insulation block used for lining a surface to be processed in a furnace, which has unit blocks formed by laminating fibrous insulation blankets under pressure.

Patent Document 3 discloses a burner tile made of an inorganic fiber molded body and having a main hole for a burner penetrating in the furnace interior and exterior direction, wherein at least the inside of the furnace of the burner tile includes an inner sheath surrounding the main hole, an outer jacket surrounding the outer periphery of the inner jacket, in which inorganic fiber plates are laminated with their plate surfaces facing in a substantially radial direction with respect to the main hole; A burner tile is described in which a fiber blanket wraps multiple times around the outer circumference of the inner jacket.

In Patent Document 4, a burner is formed through a vertical wall of a furnace having a steel furnace shell covering the outer periphery and an inner wall portion made of a cotton-like ceramic heat insulating material provided inside the furnace shell. A horizontal hole made of a ceramic fiber molded product formed so as to provide a flame penetration space through which the flame penetrates by blocking between the flame blown out from the burner and the inner wall part in the horizontal hole in which the flame outlet side of is installed A furnace structure is described which is characterized by the provision of members.

JP-A-6-281132 JP 2011-226771 A Patent No. 6409786 Patent No. 6062873

In the case of the ceramic fiber burner tile of Patent Document 1, in order to fix the blanket that forms the inner cylindrical portion, it is necessary to attach an iron shell (fixing metal fitting) protruding inside the furnace, which complicates the construction. In addition, since the fixing metal fittings protrude inside the furnace, the heat resistance is inferior.
In addition, in the above fixing method, the blanket cannot be compressed and installed, so the strength of the inner cylinder is not sufficient, and the inner wall and through holes may be damaged when exhausting air during suction or when high-temperature preheated air is supplied. There is a problem that the inner peripheral surface of the is eroded by wind. In addition, due to insufficient heat resistance, the blanket shrinks, reducing the energy-saving effect and causing damage to the casing due to heat transfer.

When constructing the fibrous heat insulating material block of Patent Document 2, the inorganic fiber blanket is compressed into a block, and the heat insulating block formed by attaching fixing metal fittings (fixing rod and channel) to the surface of the side fixed to the furnace wall is placed in the furnace. A module construction method is adopted in which a stud provided perpendicularly to a wall is attached via the fixing bracket, and from the viewpoint of preventing falling, it is suitable as a heat insulating member for ceiling attachment. However, from the viewpoint of the strength of the heat insulating block, since the fixing bracket is attached near the center of the side of the heat insulating block that is fixed to the furnace wall, it is not possible to form a hole near the center of the heat insulating block. There was a problem.

In order to solve the above problem, if the fixing bracket is attached to the end of the side of the insulation block that is fixed to the furnace wall, the compression balance between the side with the fixing bracket and the side without the fixing bracket will be lost, and the strength of the insulation block will decrease. There is a problem that the It is also conceivable to provide a through hole in the center of the side of the heat insulating block that is to be fixed to the furnace wall, and attach fixing fittings to both ends of the surface to balance the compression. In such a case, there is a problem that the attachment position of the fixing bracket and the attachment position of the stud to be welded to the casing must be very accurate.

The burner tile described in Patent Document 3 has high resistance to wind corrosion on the inner peripheral surface of the hole, and is suitable for use as a burner tile ^. Not suitable for large burner tile applications as it is difficult to use and press make. Further, when there are a plurality of through-holes, it is difficult to uniformly compress the space between the holes, and there are problems such as a decrease in the dimensional accuracy between the holes and a decrease in the strength between the holes.
In order to manufacture the burner tile described in Patent Document 3 so as to be attached to a large casing, a plurality of burner tiles must be assembled. However, when fixing multiple burner tiles to a large casing, there are places where only the back side is glued and fixed to the casing. There is a problem that it is not suitable for departments.
Also, burner tiles used in regenerative burners have a plurality of holes, but the distance between the holes is often relatively short. When a plurality of burner tiles described in Patent Document 3 are used in combination, the distance from the through hole to the outer peripheral surface of the burner tile may be less than 30 mm, and the thickness is insufficient and the strength from the hole to the outer peripheral surface is low. There was a problem that it was inadequate.

In the method described in Patent Document 4, the horizontal hole member is inserted inside the hole, but when used in the ceiling, it is necessary to bond the horizontal member and the inner wall portion, which is a cotton-like ceramic heat insulating material. However, there is a concern that the adhesive may peel off after long-term use and the lateral hole member may drop if only the adhesive is used. Moreover, although the adhesive is not required by attaching the flange to the lateral hole member, the weight of the lateral hole member is supported only by the flange portion.

In view of the above, an object of the present invention is to provide a burner refractory having a plurality of holes, which can be attached to a large-sized casing.

The present inventors have found out the following matters as a result of intensive studies in order to solve the above problems.
・By combining multiple inorganic fiber compression moldings, it can be applied to a large casing.
- By forming the through-holes with a plurality of inorganic fiber compression-molded bodies, the strength of the inorganic fiber compression-molded body itself can be maintained, and the strength between the through-holes can be maintained.

Based on the above matters, the present inventor completed the following invention.
A first aspect of the present invention is a burner refractory having a plurality of through-holes, wherein each through-hole is formed from a plurality of inorganic fiber compression-molded bodies.

In the first aspect of the present invention, it is preferable that the width of the mat of the inorganic fiber assembly forming the inorganic fiber compression-molded body is 50 mm or more.

In the first aspect of the present invention, it is preferable that a fixing metal fitting is attached to a substantially central portion of the surface of the inorganic fiber compression-molded body that is to be fixed to the furnace shell.
Moreover, it is preferable that the fixing bracket is elongated in the compression direction of the inorganic fiber compression-molded body. For example, in the form shown in FIG. 3A, the inorganic fiber compression-molded body is compressed in the X direction, so the solid metal fitting is elongated in the X direction.

In the first aspect of the present invention, it is preferable that the compression direction of the inorganic fiber compression-molded body is the same direction as the direction in which the plurality of through holes are arranged in the refractory for burner.

In the first aspect of the present invention, among the plurality of through-holes, the inside of the through-hole through which the combustion air enters and exits is provided with a cylindrical molded body in which inorganic fiber plates are laminated such that the plate surface is substantially radial with respect to the hole. Preferably, the cross-sectional area of the through hole on the furnace shell side is larger than the cross-sectional area on the inside of the furnace.
Moreover, it is preferable that the cylindrical molded body has a replaceable structure. The replaceable structure is, for example, the structure shown in FIGS. 4(a) and 4(b). In this case, the cylindrical molded body can be removed from the outside of the furnace shell and replaced.

In the first aspect of the invention, it is preferable that the inorganic fiber compression-molded body has at least one notch structure that forms the through-hole.

In the first invention, it is preferable that the area inside the furnace is 0.5 m ² or more.

The first burner refractory of the present invention is preferably attached to the casing.

The first refractory for burners of the present invention is preferably attached to the ceiling.

A second aspect of the present invention is a method for producing a refractory for burners, comprising a plurality of through holes, each through hole being formed from a plurality of inorganic fiber compression-molded bodies,
The compression direction of the plurality of inorganic fiber compression-molded bodies is set to be the same as the direction in which the plurality of through-holes to be formed are arranged, and the through-holes are formed by combining the cutout structures provided in the plurality of inorganic fiber compression-molded bodies. It is a manufacturing method of the refractory for burners provided with the process of arrange|positioning these inorganic fiber compression molding bodies so that it may carry out.

The third aspect of the present invention is an inorganic fiber compression-molded body that constitutes the refractory for burners of the first aspect of the present invention.

A fourth aspect of the present invention is a regenerative burner comprising the burner refractory of the first aspect of the present invention.

A fifth aspect of the present invention is an industrial furnace equipped with the regenerative burner of the fourth aspect of the present invention.

According to the refractory for burner of the present invention, it is possible to provide a refractory for burner that is attached to a large casing and has a plurality of holes.

FIGS. 1(a) and 1(b) show the furnace shell side surface of a burner refractory 100, and are schematic diagrams showing the arrangement of each inorganic fiber compression molded body 10. FIG. FIG. 2(a) is a perspective view of the inorganic fiber compression molded body 10. FIG. FIG. 2(b) is a schematic diagram showing a method of manufacturing the inorganic fiber compression-molded body 10. As shown in FIG. FIG. 2(c) is a side perspective view showing a state in which the inorganic fiber compression-molded body 10 is fixed to the furnace shell 50. FIG. 3(a) and 3(b) are schematic diagrams for explaining the position of the block fixing bracket 16 of the burner refractory. FIG. 4(a) is a perspective view of the cylindrical molded body 30. FIG. FIG. 4(b) is a cross-sectional view of the burner refractory 100 in which the cylindrical molded body 30 is provided in the through hole 20 and installed in the furnace shell 50. FIG. FIG. 5 is a schematic diagram for explaining the position of the block fixing bracket 16 of the refractory for burner and the portion of the inorganic fiber compression molded body 10 forming the through hole where the through hole is formed. FIG. 6 is a schematic diagram for explaining the definition of the direction in which through holes are arranged.

Hereinafter, a burner refractory, a manufacturing method of the burner refractory, a regenerative burner provided with the burner refractory, and an industrial furnace provided with the regenerative burner will be described as an example of an embodiment of the present invention. However, the scope of the present invention is not limited to the embodiments described below.
The description of "a to b" indicating a numerical range means "a or more and b or less" unless otherwise specified, and includes the meaning of "preferably larger than a" and "preferably smaller than b". It is something to do.
In addition, the upper limit and lower limit of the numerical range in this specification, even if slightly deviating from the numerical range specified by the present invention, as long as it has the same effect as within the numerical range, the present invention shall be included in the equivalent range of

<Refractory material for burner 100>
A burner refractory 100 of the present invention is a burner refractory provided with a plurality of through-holes 20 , each through-hole 20 being formed from a plurality of inorganic fiber compression-molded bodies 10 .
FIG. 1 shows a conceptual diagram of the burner refractory 100 of the present invention as viewed from the inside of the furnace. FIG. 1(a) shows a burner refractory 100 composed of six inorganic fiber compression-molded bodies 10, each through-hole 20a, 20b, 20c composed of two inorganic fiber molded bodies. 2(b), it is composed of four inorganic fiber compression molded bodies 10, the left and right through holes 20a and 20c are each composed of two inorganic fiber compression molded bodies, and the central through hole 20b is composed of four compression molded bodies. A burner refractory 100 constructed from a body is shown.

(plurality of through holes 20)
The burner refractory shown in FIG. 1 has three through holes 20a, 20b, and 20c. The through holes 20a and 20c correspond to fuel injection holes, and the through hole 20b corresponds to a through hole through which combustion air enters and exits.
However, the number of through-holes 20 is not limited to three as shown in the figure, and as long as it is at least two, it can take various forms depending on the type of burner installed, but the three through-holes shown in FIG. A form provided is preferable.

(Plural compression-molded bodies 10)
In addition, FIG. 1(a) shows a form composed of six inorganic fiber compression molded bodies 10, and FIG. 1(b) shows a form composed of four inorganic fiber compression molded bodies 10. The number of constituent inorganic fiber compression-molded bodies 10 is not limited to these, and may be at least two, preferably four or more.
Further, in the embodiment of FIG. 1, all of the inorganic fiber compression-molded bodies 10 constituting the burner refractory 100 show a form having a notch structure 22 to be described later, but the burner refractory of the present invention 100 may further include an inorganic fiber compression molded body 10 that does not have the cutout structure 22 .
The size of the burner refractory 100 is preferably 0.5 m ² or more because the durability of the through-holes increases when the area of the inner surface of the furnace has a plurality of through-holes. By using a large-sized refractory having a furnace inner surface area of 0.5 m ² or more, it can be suitably used as a burner refractory having a plurality of through holes (for example, a regenerative burner refractory). .

(Inorganic fiber compression molding 10)
- Mat of Inorganic Fiber Aggregate The inorganic fiber compression molded body 10 is manufactured by laminating mats of inorganic fiber aggregate. The inorganic fibers forming the mat of the inorganic fiber aggregate are not particularly limited, but examples thereof include silica, alumina, alumina/silica, zirconia containing these, spinel, titania and calcia alone or composite fibers. Among them, particularly preferred are alumina/silica fibers, particularly polycrystalline alumina/silica fibers, in terms of heat resistance, thermal shock resistance, fiber strength (toughness), and safety. In particular, alumina/silica fibers having an alumina ratio of 70 to 80% by weight and a silica ratio of 30 to 20% by weight are preferred. Alumina/silica fibers with an alumina ratio of 70 to 76% by mass and a silica ratio of 30 to 24% by mass are preferred because they can withstand compression and are resistant to heat.

As a mat of inorganic fiber aggregates, needling treatment is applied to aggregates of inorganic fibers that do not substantially contain fiber diameters of 3 μm or less for the reason of enhancing heat resistance and durability while ensuring safety. A mat (needle blanket) is preferred.
Although the bulk density of the inorganic fiber aggregate is not particularly limited, it is preferably 85 kg/m ³ to 150 kg/m ³ and more preferably 90 kg/m ³ to 140 kg/m ³ in terms of heat resistance and strength of the heat insulating block 10 formed. More preferably 90 kg/m ³ to 128 kg/m ³ is particularly preferred.

The thickness of the mat of the inorganic fiber aggregate is appropriately selected, but is preferably 10 to 30 mm, more preferably 12.5 to 27 mm, from the viewpoint of workability and strength. If the thickness is too thin, construction will be troublesome, and if the thickness is too thick, it will be difficult to maintain the structure when folded.
The size (width) of the mat of the inorganic fiber aggregate is adjusted according to the size of the inorganic fiber compression-molded body 10 to be formed, and is not particularly limited. The size of the mat is appropriately adjusted depending on the size of the burner refractory 100 to be formed, the compression direction, and how many divisions the burner refractory is divided. Specifically, the minimum size (width) of the mat is preferably 50 mm or more in order to maintain the shape of the inorganic fiber compression-molded body. More preferably, it should be 100 mm or more.
Incidentally, when the inorganic fiber compression-molded body 10 is provided with the cutout structure 22, the width of the mat of the inorganic fiber assembly corresponding to the cutout structure 22 is reduced by the cutout structure 22, but in that case Even if there is, it is preferable to have a width equal to or greater than the above lower limit. If the width exceeds the above lower limit and is too small, it becomes difficult to stack, fold, or compress the inorganic fiber aggregate mat. In addition, it becomes difficult to maintain the shape of the inorganic fiber compression-molded body.

- Lamination Method of Mat FIG. It should be noted that the inorganic fiber compression-molded body 10 of FIG. 2(a) does not have a notch structure 22, which will be described later. In addition, FIG. 2(b) shows a schematic diagram showing an example of a method for producing the inorganic fiber compression-molded body 10. As shown in FIG.
The method of laminating the inorganic fiber aggregate mat in the inorganic fiber compression-molded body 10 is not particularly limited. A plurality of plate-like mats of inorganic fiber aggregates having the size of the inorganic fiber compression-molded body 10 to be formed may be laminated, or a long inorganic fiber aggregate as shown in FIG. The mat 11 may be folded 90-9 times. In particular, since the block fixing bracket 16 can be fixed using the rod 12 with a fixing portion (hereinafter sometimes abbreviated as "fixing rod"), the mounting bracket can be attached more firmly to the inorganic fiber compression molded body 10. Since the durability of the inorganic fiber compression-molded body 10 is improved, it is preferable to use a long mat that is folded ninety-nine times.
In addition, when the inorganic fiber compression molding 10 has the notch structure 22, the width of the position corresponding to the notch structure 11 of the mat of the inorganic fiber assembly is small.

The bulk density of the inorganic fiber compression molded body 10 is not particularly limited, but is preferably 96 kg/m ³ to 160 kg/m ³ , more preferably 120 kg/m ³ to 150 kg/m ³ .
From the viewpoint of workability, the size of the inorganic fiber compression molded body 10 is preferably 500 mm×500 mm×500 mm or less. Moreover, when the size of the inorganic fiber compression-molded body becomes large, it becomes difficult to manufacture.

The inorganic fiber compression-molded body 10 can be sewn with an alumina rope or the like to be compressed and to retain its structure. In addition, by stacking mats of inorganic fiber aggregates, pressing both sides of the compressed surface with holding plates 18 such as plywood or metal plates, and fixing them with bands 19 or the like, the bulk density of the inorganic fiber compression molded body 10 is increased. can also be increased. By doing so, by cutting the band 19 after construction, the compression can be released, and the inorganic fiber compression-molded bodies 10 can be brought into close contact with each other and fixed to the furnace wall.

FIG. 2(c) shows a perspective side view of the inorganic fiber compression-molded body 10 fixed to the furnace shell 50. As shown in FIG.
A block fixing metal fitting 16 can be attached to the surface of the inorganic fiber compression molded body 10 in contact with the furnace shell 50 . By connecting the block fixing fitting 16 and a stud 52 erected on the furnace shell 50 (for example, by inserting the stud 52 fixed to the furnace shell 50 into a hole provided in the block fixing fitting 16, the block fixing fitting 16), each inorganic fiber compression molded body 10 constituting the burner refractory 100 of the present invention is installed on the furnace shell 50. Alternatively, by welding bolts or studs to the block fixing fittings 16, passing through the casing, and fixing them from the outside with nuts or the like, each inorganic fiber compression molded body 10 constituting the burner refractory 100 of the present invention is Installed in the furnace shell 50 .
In particular, when fixing the refractory for burners of the present invention to the ceiling, there is a possibility that the inorganic fiber compression-molded body 10 will fall only with the repulsive force when the compression is released. preferably.

(Manufacturing method of inorganic fiber compression molding 10)
An example of a method for manufacturing the inorganic fiber compression-molded body 10 is shown below.

First, an inorganic fiber aggregate mat 11 having a desired width and length is cut out. When the inorganic fiber compression-molded body 10 to be formed has a cutout structure 22, which will be described later, the mat 11 of the cutout inorganic fiber assembly has a narrow width corresponding to the cutout structure 22. . The cut out mats 11 of the inorganic fiber assembly are alternately folded and laminated as shown in FIG. 2(b).
Further, as shown in FIG. 2(b), a fixing rod 12 is attached to the inner side of the crease of the mat 11 of the inorganic fiber assembly so that the blade protrudes toward the furnace shell side of the inorganic fiber compression molded body 10 to be formed. The fixing rod 12 has the function of fixing the block fixing metal fitting 16 and the inorganic fiber compression molding 10, and as shown in the figure, it is inserted into the folded portion of the mat 11 of the inorganic fiber assembly, and the fixing rod 12 A blade penetrates the mat and protrudes toward the furnace shell side of the compression-molded inorganic fiber body 10, and is fixed to the block fixture 16 as will be described later. In addition, since the fixed rod 12 is inserted into the mat of the inorganic fiber assembly and is positioned on the furnace wall side when installed on the furnace wall, damage due to heat can be suppressed.

The number of fixing rods 12 is not particularly limited as long as the block fixing metal fittings 16 can be attached thereto, but from the viewpoint of joint strength, four or more are preferable. The material of the fixed rod 12 is not particularly limited as long as it exhibits heat resistance when used in a furnace, but examples thereof include SUS310S and SUS304. The shape of the fixing rod 12 is not particularly limited as long as it can fix the inorganic fiber compression-molded body 10 and the block fixing metal fitting 16, but for example, it may have a shape in which a triangular blade is welded to a round bar as shown in the figure. be able to.

Note that in the case of the inorganic fiber compression molded body 10 in which the mat 11 of the inorganic fiber aggregate is folded in a 99-fold pattern, but in the case of the inorganic fiber compression molded body 10 in which the mat of the plate-like inorganic fiber aggregate is laminated, the fixing rod 12 is used. The block fixing metal fitting 16 and the inorganic fiber compression molded body 10 cannot be fixed by using it. In this case, a horizontal skewer welded with support fittings is passed through the laminated mats. From the viewpoint of durability, it is preferable to fix the block fixing fitting 16 and the inorganic fiber compression-molded body 10 using the fixing rod 12 described above.

Further, as shown in FIG. 2(b), the guide pipe 14 is attached to the inside of the crease of the mat 11 of the inorganic fiber assembly. The holes of the guide pipe 14 correspond to the holes of the block fixing metal fittings 16, and the nuts are tightened from the inside of the furnace in order to join the studs of the casing and the block fixing metal fittings 16 fixed to the inorganic fiber compression molded body 10. act as a guide for The number of guide pipes 14 in each compression-molded inorganic fiber body 10 corresponds to the number of studs corresponding to each compression-molded inorganic fiber body 10 . It should be noted that the guide pipe 14 is preferably removed after the nut has been tightened, since its function has been completed.

The material of the guide pipe 14 is not particularly limited, and metal, corrugated cardboard, and plastic cylinders can be used. Although the inner diameter depends on the diameter of the stud and the size of the bolt, it is preferably 10 to 30 mm. As for the nut, it is preferable to use a nut made of heat-resistant stainless steel such as SUS310S and SUS304.

In general, the inorganic fiber assembly mat 11 placed on the furnace wall is fixed to the furnace wall by its own repulsive force. It is used to firmly fix the compression-molded body 10 to the furnace wall. Specifically, as described above, the block fixing metal fittings 16 are attached via the fixing rods 12 to the side of the inorganic fiber compression-molded body 10 that is to be installed on the furnace wall. The inorganic fiber compression-molded body 10 is attached to a stud erected on the casing via a block fixture 16 fixed to the inorganic fiber compression-molded body 10 . Then, it is installed on the furnace wall by fixing it to the stud from the inside of the furnace with a nut through the block fixing metal fitting 16 . Since the block fixing bracket 16 is attached to the furnace wall (iron shell), it is preferably made of a material that can suppress heat damage. For example, it is preferably made of heat-resistant stainless steel such as SUS310S and SUS304. .

After that, as shown in FIG. 2(a), the side surface is held down by a holding plate 18 of the same size, and through the holding plate 18, it is compressed to a predetermined thickness in the X direction of the drawing by a compression packing machine or the like, and the band is formed. 19. The band 19 is used to compress and fix the inorganic fiber compression-molded body 10 to a predetermined size. The material of the band 19 is not particularly limited as long as it exhibits this function, but for example, a polypropylene (PP) band, a polyethylene (PE) band, an iron band, or the like can be used.

The holding plate 18 is attached to the side surface of the inorganic fiber compression-molded body 10 and has a role of protecting the inorganic fiber compression-molded body 10 when the inorganic fiber compression-molded body 10 is compressed by the band 19 . After the inorganic fiber compression molding 10 is applied to the furnace wall, the band 19 is cut, and the restraining plate 18 is also removed. The material of the pressing plate 18 is not particularly limited, and can be appropriately selected from plywood, wood, steel, plastic, cardboard, and the like. The shape of the pressing plate 18 is not particularly limited, but is selected according to the side shape of the inorganic fiber compression molded body 10 . Although the size of the pressing plate 18 is not specified, it is preferably slightly larger than the size of the inorganic fiber compression molding 10 .

After that, a block fixing fitting 16 is attached to the blade of the fixing rod 12 protruding from the inorganic fiber compression molded body 10 . For example, the block fixing metal fitting 16 can be fixed to the fixing rod 12 by passing the blade of the fixing rod 12 through a slit provided in the block fixing metal fitting 16, bending the blade, and fixing it with welding or screws.

(Notch structure 22, through hole 20)
A burner refractory 100 of the present invention has a plurality of through-holes 20 formed from a plurality of inorganic fiber compression-molded bodies 10 . Therefore, the inorganic fiber compression-molded body 10 forming the through-holes 20 has the notch structure 22 .

In the burner refractory 100 of the present invention, the through-holes 20 are formed by a plurality of inorganic fiber compression-molded bodies 10. In contrast, when the through-holes 20 are formed by one inorganic fiber compression-molded body 10, is shown in FIG.
In the form shown in FIG. 3A, the direction of compression of the inorganic fiber compression-molded body is 90 degrees different from the direction in which the plurality of through holes are arranged. In each inorganic fiber compression-molded body 10 , since it is necessary to attach the fixing metal fitting 16 while avoiding the through hole 20 , the fixing metal fitting 16 does not exist near the central portion of the inorganic fiber compression-molding body 10 . Therefore, the compressive strength is not constant, and the strength of the inorganic fiber compression-molded body 10 becomes a problem. In other words, the problem is that the degree of opening when the band is cut differs between the side with the fixing metal 16 and the side without it. In the case of construction on the ceiling, if there is a mounting bracket on one side, there is a problem that the side without the mounting bracket hangs down.

In the form shown in FIG. 3(b), in each inorganic fiber compression-molded body 10, two fixing metal fittings 16 are attached across the through-hole 20 to uniformize the compression. However, in this case, a very high level of mounting accuracy is required for the fixture 16, and a very high level of positional accuracy is required for the corresponding studs, making construction difficult and impractical.
In the burner refractory 100 of the present invention, the above problem is solved by forming the through-holes 20 with a plurality of inorganic fiber compression-molded bodies 10 having the cutout structure 22 . That is, in each inorganic fiber compression-molded body 10 constituting the burner refractory 100 of the present invention, there is no through-hole in the substantially central portion of the surface of the inorganic fiber compression-molded body 10 on the side fixed to the furnace shell. Since the fitting 16 is attached, the above problem does not occur. Here, the “approximately central portion” preferably means that the center of gravity of the fixture 16 is located within a range of a circle having a radius of 75 mm from the center of gravity of the side of the compression-molded inorganic fiber body 10 installed on the furnace wall. Alternatively, preferably, the center of gravity of the fixture 16 is positioned at the center when the surface of the inorganic fiber compression molded body 10 to be installed on the furnace wall is vertically and horizontally divided into three. means to set

The burner refractory 100 of the present invention can also take the form shown in FIG. 5(a). In this embodiment, the compression direction of each inorganic fiber compression-molded body 10 is different from the arrangement of the through holes by 90 degrees. In this embodiment, since the mounting bracket 16 is attached to the substantially central portion of each inorganic fiber compression-molded body 10, the above problem is solved. However, in the form shown in FIG. 5(a), a fixing rod 12 is attached to a portion of the inorganic fiber compression-molded body 10 forming a through hole (location Z1 indicated by a dotted line circle in the figure) where the through hole is formed. (The position where the fixing rod 12 is attached is indicated by a dotted line in the drawing.). Therefore, when it is used on a ceiling or the like, there is a possibility that the portion of the compression-molded inorganic fiber that is far from the mounting bracket 16 is insufficiently fixed to the casing and hangs down in the furnace.

The burner refractory 100 of the present invention can also take the form shown in FIG. 5(b), which is more preferable than the form shown in FIG. 5(a). In this embodiment, the compression direction of each inorganic fiber compression-molded body 10 is different from the arrangement of the through holes by 90 degrees. A mounting bracket 16 is attached to a substantially central portion of each inorganic fiber compression-molded body 10, and the mounting bracket 16 also supports the portion of the through hole. However, when the distance between the through-holes is short, the size (width) of the mat of the inorganic fiber assembly forming the notch structure 22 in the portion Z2 indicated by the dotted circle in the drawing may be narrow. . If the width is narrow, it becomes very difficult to stack and fold the inorganic fiber aggregate mats. Moreover, even if an inorganic fiber compression-molded body is produced, there is a possibility that the strength cannot be sufficiently maintained. At least the width of the mat of the inorganic fiber assembly forming the inorganic fiber compression-molded body 10 is preferably 50 mm or more, more preferably 100 mm.

On the other hand, as shown in FIGS. 1A and 1B, the compression direction of each inorganic fiber compression molded body 10 is the same as the direction in which the plurality of through holes 20 formed in the burner refractory 100 are arranged. preferably in the same direction.
The strength between the through-holes 20 of the burner refractory 100 of the present invention is such that when the inorganic fiber compression-molded body 10 is arranged in the same direction as the plurality of through-holes 20, even if the through-holes 20 are narrow. The width of the mat of the inorganic fiber assembly between the through-holes can be sufficiently secured, and the strength between the through-holes is improved.
(In the case of FIG. 1(a), the narrowest point is the portion Z3 indicated by the dotted line circle.)

The number of notch structures 22 forming one through-hole 20 is preferably two or more, more preferably two to four. In the form of FIG. 1(a), each through-hole 20 is composed of two cutout structures 22, and in the form of FIG. The central through-hole 20b is composed of four notch structures 22. As shown in FIG.

The shape of the cutout structure 22 is not particularly limited as long as it is combined to form the through hole 20. For example, as shown in FIG. Like the cutout structure 22 forming the through hole 20b in the central portion of b), it can be formed into a quadrant columnar shape with a fan-shaped cross section.

The inorganic fiber compression molded body 10 preferably has at least one notch structure 22 . Preferably, the inorganic fiber compression-molded body 10 has two or more notch structures 22 . In the form of FIG. 1(a), each inorganic fiber compression molded body has one cutout structure 22, and in the form of FIG. 1(b), each inorganic fiber compression molded body has two cutout structures. 22.

In the burner refractory 100 of the present invention, the through holes 20 are formed by the inorganic fiber compression molding 10 formed by compressing the inorganic fiber mat. Further, as described below, in a preferred embodiment, the compression direction of the inorganic fiber compression-molded body 10 is the direction in which the plurality of through-holes 20 of the burner refractory 100 are aligned. As a result, the strength between the through-holes 20 is maintained, the distance between the through-holes can be shortened, and the degree of freedom in equipment design is increased.

Specifically, the distance between the partition walls between the through-holes 20 is preferably 30 mm or more, more preferably 50 mm or more, more preferably 50 mm or more, for the reasons of maintaining the strength between the through-holes and preventing fluid leakage between the through-holes. is preferably 80 mm or more. Also, the lower limit is preferably up to 20 mm.

The shape of the through hole 20 is not particularly limited, but a circular or elliptical shape is preferable because a complicated shape increases the possibility of deformation due to aging. The size is preferably φ (diameter) of 50 mm or more and 500 mm or less.

(Definition of through hole)
The through-holes formed in the inorganic fiber compression-molded body 10 constituting the burner refractory 100 include through-holes for the entry and exit of combustion air, fuel injection holes, peepholes, and holes for inserting instruments. Although possible, the through-holes targeted by the present invention are through-holes through which combustion air enters and exits, and fuel injection holes.
The diameter (φ) of the through hole through which the combustion air enters and exits is preferably 40 mm or more and 550 mm or less, more preferably 150 mm or more and 350 mm or less. Also, the diameter (φ) of the fuel injection hole is preferably 20 mm or more and 300 mm or less, more preferably 50 mm or more and 200 mm or less. In addition, the diameter (φ) of the peep hole or the hole for inserting the instrument is usually 10 mm or more and 50 mm or less.

(Definition of the direction in which through holes are arranged)
In the present invention, the direction in which the through-holes are arranged means that the through-holes are aligned in the vertical center of the figure (in the direction parallel to the long side of the surface of the refractory for burner to be installed in the furnace shell), as shown in FIG. In this case, the Y1 direction in the figure is the direction in which the through holes are arranged.
However, the direction in which the through-holes are arranged is not limited to the above-described direction, and the through-holes may be arranged in a direction obliquely shifted from the vertical direction in the figure. Such an example is shown in FIGS. 6(a) and 6(b).
In FIGS. 6A and 6B, the through-hole is obliquely displaced from the direction parallel to the long side of the installation surface of the furnace shell of the burner refractory. In such a form, the direction in which the through holes are arranged is defined as follows. First, an axis Y2 and an axis Y3 are set at the central axis of any one of the through holes in parallel with the long side and the short side of the burner refractory. When one of the axes overlaps with another through-hole (in the case of FIG. 6(a)), the direction of the axis (axis Y3 in the case of FIG. 6(a)) is defined as the direction in which the through-holes line up. do. In addition, when none of the axes overlaps with another through hole (case of FIG. 6(b)), or when both axes overlap with another through hole, the distance from the center of the other through hole is selected, and the direction of the selected axis (the axis Y3 in the case of FIG. 6B) is defined as the direction in which the through holes are arranged.

(Through hole through which combustion air enters and exits)
When the burner refractory 100 of the present invention has a through hole 20 through which combustion air enters and exits (in the form shown in FIG. 1, the central through hole 20b corresponds to the through hole through which combustion air enters and exits, The through holes 20a and 20c correspond to fuel injection holes.), and the through hole 20 through which the fuel air flows is required to have higher durability than the fuel injection holes.
Therefore, it is preferable to provide a cylindrical molded body 30 as shown in FIG. 4A along the inner peripheral surface of the through hole 20 through which the combustion air flows.
Further, the through hole 20 through which the combustion air enters and exits prevents the cylindrical molded body 30 from coming off and holds the cylindrical molded body 30 stably. is preferably larger than the cross-sectional area of FIG. 4(b) shows a cross-sectional view of the burner refractory 100 in which the cylindrical molded body 30 is provided in the through hole 20 and installed in the furnace shell 50. As shown in FIG. As shown in FIG. 4B, the cross-sectional shape passing through the axis of the through-hole 20 is a trapezoidal shape that widens toward the furnace shell, and the angle formed by the oblique side of the trapezoidal shape with respect to the axis of the through-hole 20 is , preferably 10 degrees or more, more preferably 15 to 30 degrees.

・ Cylindrical molding 30
One embodiment of the tubular molding 30 is shown in FIG. The cylindrical molded body 30 preferably has a structure in which inorganic fiber plates 31 and 32 are laminated such that the plate surfaces are substantially radial with respect to the holes.
The illustrated tubular molding 30 comprises a first plate 31 having a triangular or trapezoidal cross section perpendicular to the axis of the tubular molding 30 and a second plate 32 having a rectangular cross section perpendicular to the coaxial. are alternately laminated. The first plate 31 having a triangular or trapezoidal cross section is arranged so that the vertex side of the triangle or the short side of the trapezoid faces the inner peripheral surface of the hole 34 . The second plate 32 having a rectangular cross section is arranged so that one short side of the rectangle faces the inner peripheral surface of the hole 34 . The longitudinal direction of each of the plates 31 and 32 is the axial direction of the hole 34 . By alternately arranging the plates 31 and 32 in the circumferential direction of the hole 34, a winding body composed of a laminated body of the plates 31 and 32 surrounding the hole 34 is constructed. In this winding body, the plate surfaces of the plates 31 and 32 are substantially radial with respect to the hole 34 .

An example of a method for manufacturing the cylindrical molded body 30 will be described below.
First, a mold having the shape of the hole 34 of the cylindrical molded body 30 is prepared. After winding a release sheet made of glass cloth or the like around the outer peripheral surface of the mold, plates 31 and 32 made of inorganic fiber blankets are placed around the outer periphery of the mold, with the plate surfaces oriented radially with respect to the axis of the mold. The plates 31 and 32 are arranged so as to be alternately laminated in the circumferential direction to surround the mold. It should be noted that it is preferable to compress the plates 31 and 32 when arranging the plates 31 and 32 . As a result, the circularity of the hole 34 to be formed is increased, and a gap does not occur between the plates 31 and 32 .

The means for compressing the plates 31 and 32 is not particularly limited, but it can be achieved by using an auxiliary tool such as a tightening belt to tighten them to a predetermined compression rate and then fixing them with a bandage or tape. The compressibility is preferably 10% or more in view of required physical properties such as wind corrosion resistance, and is preferably 50% or less in order to prevent crushing of fibers due to compression.

The compressed body prepared above is immersed in a binder liquid containing an inorganic sol. In this case, it is preferable to immerse the compressed body in the binder liquid with the axial direction of the compressed body being the vertical direction. The binder liquid permeates from the inner peripheral surface of the compressed body into the inside of the compressed body through small holes formed in the mold, permeates the wrapper or tapes on the outer periphery, and flows from the outer peripheral surface of the compressed body. permeate the interior of Further, the binder liquid permeates directly into the compressed body from the exposed surface that is not covered with the wrapper or tape.

After the binder liquid permeates at least the inner peripheral side and the outer peripheral side of the compressed body, the compressed body is pulled up from the binder liquid. The immersion time can be appropriately adjusted according to the size and structure of the compressed body or the composition of the binder liquid, but it should be such that no air bubbles can be visually confirmed from the compressed body after the compressed body is immersed in the binder liquid. It is preferable to go to

The binder liquid permeated in the mold of the compressed body pulled up from the binder liquid is sucked. Then, air is sucked into the compressed body through the exposed surface of the compressed body, etc., and part of the binder liquid held in the compressed body is sucked into the inner hole of the mold and discharged. After the binder liquid is sucked out for a predetermined time, the compressed body is transferred into a dryer and dried at a temperature of preferably 100° C. or higher. After that, the compressed body is taken out from the drier, allowed to cool, and the wrapper or tape covering the outer periphery is removed, and the mold is removed. At this time, the release sheet wrapped around the mold is also removed.

The compressed body dried and demolded in this way is transferred to a sintering furnace and sintered to bake the inorganic binder onto the inorganic fibers. Thereby, a cylindrical molded body is obtained. A hole 34 is formed in the cylindrical molded body by removing the mold. After that, the protruding portions (burrs) are cut off from the cylindrical molded body, and the cylindrical molded body is shaped to have standard dimensions to obtain a cylindrical molded body 30 . For shaping, for example, a high-speed shearing device such as a band saw is used.

Of the through-holes 20 of the burner refractory 100 of the present invention, the through-hole 20 through which the fuel air enters and exits preferably has a larger cross-sectional area on the furnace shell side than the cross-sectional area on the inside of the furnace. It is preferable that the above-described cylindrical molded body 30 inserted into the through-hole 20 through which the fuel air enters and exits has a shape along the through-hole 20 through which the fuel air enters and exits. A hollow frusto-conical shape with a large diameter and a small diameter inside the furnace is preferred.
In FIG. 4, the hole 34 has a hollow truncated cone shape with a large diameter on one side in the axial direction (front side in the drawing) and a small diameter on the other side (back side in the drawing). By combining the through-hole 20 having such a shape and the cylindrical molded body 30, the cylindrical molded body 30 is prevented from being detached from the through-hole 20. , the cylindrical molding 30 can be installed in the through hole 20 without bonding. Moreover, the contact area between the cylindrical molded body 30 and the through hole 20 is increased, and the cylindrical molded body 30 can be supported more stably.

<Method for producing burner refractory 100>
The burner refractory 100 of the present invention is installed on the furnace wall so as to combine a plurality of inorganic fiber compression molded bodies 10 so that the cutout structures 22 of the inorganic fiber compression molded bodies 10 are combined to form the through holes 20. By doing so, it can be manufactured (installed).

As a method of installing each inorganic fiber compression-molded body 10 on the furnace wall, for example, a casing for housing the burner refractory 100 is used and installed on the furnace shell. The casing has a box shape with an open surface on the inside of the furnace, and studs are erected on the inside of the surface on the side to be installed on the furnace wall. Each inorganic fiber compression-molded body 10 can be installed in the casing by inserting the hole of the fixing metal fitting 16 of each inorganic fiber compression-molded body 10 into the stud and tightening bolts from the inside of the furnace.
If there is a gap between the casing and the inorganic fiber compression-molded body 10, an inorganic fiber aggregate mat is inserted in the gap as needed. After that, the band 19 is cut, the holding plate 18 is removed, the compression is released, and the inorganic fiber compression molding 10 is fixed to the casing.

Holes are provided at positions corresponding to the through-holes 20 on the surface of the casing which is to be installed on the furnace wall. A cylindrical molded body 30 is inserted into the through hole 20 through which the combustion air enters and exits from the hole of the casing. The through hole 20 through which the combustion air enters and exits preferably has a larger cross-sectional area on the furnace shell side than the cross-sectional area of the hole on the inside of the furnace, so that the cylindrical molded body 30 can be easily inserted. and, even if the burner refractory 100 is installed on the ceiling, the cylindrical molded body 30 can be prevented from coming off.

As a method for installing the casing containing the burner refractory 100 of the present invention on the furnace wall, preferably, the casing containing the burner refractory 100 is attached from the outside of the furnace, and the flange portion of the casing and the like are attached. A method of fixing with a bolt or the like can be mentioned.

(Compression direction of inorganic fiber compression molded body 10)
The compression direction of the inorganic fiber compression molded body 10 is preferably the same direction as the direction in which the plurality of through holes 20 formed in the burner refractory 100 are arranged.
The strength between the through-holes 20 of the burner refractory 100 of the present invention is such that when the inorganic fiber compression-molded body 10 is arranged in the same direction as the plurality of through-holes 20, even if the through-holes 20 are narrow. The width of the mat of the inorganic fiber assembly between the through-holes can be sufficiently secured, and the strength between the through-holes is improved. On the other hand, if the compression direction of the inorganic fiber compression molded body 10 is different from the direction in which the through-holes 20 are arranged, the through-holes 20 will be formed with an extremely fine inorganic fiber aggregate mat, which is not suitable.

<Use of refractory 100 for burner of the present invention>
The burner refractory 100 of the present invention is suitable as a burner refractory installed on the ceiling. That is, as described above, in a preferred embodiment, the through hole 20 through which the combustion air enters and exits has a large cross-sectional area on the furnace shell side and a narrow cross-sectional area on the inside of the furnace, and has a truncated cone shape. Even so, detachment of the cylindrical molded body 30 in the through hole 20 is prevented. In addition, since it is composed of the inorganic fiber compression molded body 10, there is no problem that human life is threatened by falling broken fragments unlike conventional castable burner tiles.

The burner refractory 100 of the present invention is suitable as a burner refractory installed on the ceiling. In particular, it is suitable as a refractory for regenerative burners that require a plurality of holes.

100: Burner refractory 10: Inorganic fiber compression molded body 11: Mat of inorganic fiber assembly 12: Rod with fixing part 14: Guide pipe 16: Block fixing metal fitting 18: Holding plate 19: Bands 20a, 20b, 20c: Penetration Hole 22: Notch structure 30: Cylindrical moldings 31, 32: Inorganic fiber plate 34: Hole 50: Furnace shell 52: Stud 54: Nut

Claims (13)

A burner refractory having a plurality of through holes, each through hole being formed from a plurality of inorganic fiber compression molded bodies,
A fixing metal fitting is attached to a substantially central portion of the surface of the inorganic fiber compression molded body that is to be fixed to the furnace shell,
A refractory for a burner, wherein the fixture is elongated in the compression direction of the inorganic fiber compression-molded body . 2. The refractory for a burner according to claim 1, wherein the width of the mat of the inorganic fiber aggregate forming said inorganic fiber compression-molded body is 50 mm or more. 3. The refractory for burners according to claim 1 , wherein the compression direction of said inorganic fiber compression-molded body is the same as the direction in which said plurality of through holes are arranged in said refractory for burners. Among the plurality of through-holes, the inside of the through-hole through which the combustion air enters and exits is provided with a cylindrical molded body in which inorganic fiber plates are laminated such that the plate surface is substantially radial with respect to the hole, and the furnace shell of the through-hole The refractory for burners according to any one of claims 1 to 3 , wherein the side cross-sectional area is larger than the cross-sectional area inside the furnace. 5. The burner refractory according to claim 4 , wherein said cylindrical molded body has a replaceable structure. 6. The burner refractory according to any one of claims 1 to 5 , wherein said inorganic fiber compression-molded body has at least one notch structure forming said through-hole. The refractory for burners according to any one of claims 1 to 6 , wherein the area inside the furnace is 0.5 m ² or more. The burner refractory according to any one of claims 1 to 7 , which is attached to a casing. The burner refractory according to any one of claims 1 to 8 , which is attached to a ceiling. A method for producing a refractory for a burner having a plurality of through-holes, each through-hole being formed from a plurality of inorganic fiber compression-molded bodies,
The compression direction of the plurality of inorganic fiber compression molded bodies is set to be the same as the direction in which the plurality of formed through holes are arranged, and the cutout structures provided in the plurality of inorganic fiber compression molded bodies are combined,
A method for producing a refractory for burners, comprising the step of arranging the plurality of inorganic fiber compression-molded bodies so as to form through-holes. An inorganic fiber compression molded body constituting the refractory for burners according to any one of claims 1 to 9 . A regenerative burner comprising the burner refractory according to any one of claims 1 to 9 . An industrial furnace comprising the regenerative burner according to claim 12 .

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