JP2004053166A - Air-cooled type refractory wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-cooled type refractory wall for effectively preventing the production and attachment of clinker on a furnace wall inner face of a refuse incinerator, stably burning the refuse of high calorie at a high temperature at all times, and effectively coping with the countermeasures against dioxin. <P>SOLUTION: This air-cooled type refractory wall is configurated by an airtight steel plate case 19 of a rectangular transverse section, having a cooling air inlet 14 and a cooling air outlet 15, an anchor 20 penetrated through an inner steel plate 1 of the steel plate case 19 to be fixed to an inner part of the case 19 at its basic end part, and projected to an outer part of the inner steel plate 1 at its head part, a monolithic refractory 21 laminated and fixed on an outer face of the inner steel plate 1 with an even thickness in a state of wrapping the anchor 20, and an outer casing 10 mounted on an outer face side of an outer steel plate 7 of the steel plate case 19 through a refractory 11, and the monolithic refractory 21 is cooled by the cooling air A supplied from the cooling air inlet 14 through the inner steel plate 1 and the anchor 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement of an air-cooled fire wall such as a refuse incinerator for incinerating waste such as municipal solid waste or a high-temperature gas flue. The present invention relates to an air-cooled fire-resistant wall capable of preventing the occurrence of cracks.
[0002]
[Prior art]
In refuse incinerators, various measures have conventionally been taken to prevent clinker from being generated and adhered to the inner wall of the furnace wall. For example, (a) a method of using a silicon carbide refractory having excellent heat resistance and adhesion resistance for a furnace wall in a place where clinker is easily generated, (b) a method of using a water wall structure for the furnace wall itself, and (c). A method of lowering the ambient temperature by spraying steam and a method of suppressing the occurrence of abnormal combustion by (d) suppression combustion using recirculated gas have been used as measures to prevent the occurrence of clinker.
[0003]
However, in recent years, municipal solid waste to be incinerated has become extremely high in calories, and the combustion temperature of the incinerator tends to increase due to the demand for dioxin-related combustion management on the incinerator side. It is in.
As a result, troubles caused by clinker generation and adhesion inevitably increase in refuse incinerators, and in particular, in stoker-type incinerators, clinker adhesion hinders the sending of garbage on the stoker. However, instability of refuse combustion in the furnace is becoming a serious problem. This is because when the combustion of refuse becomes unstable, harmful substances such as dioxin are generated.
[0004]
In addition, this type of trouble caused by clinker generation and adhesion on the inner surface of the furnace wall refractory is not only a problem unique to the stoker type incinerator, but also a fluidized bed type incinerator, a refuse melting furnace, Of course, a similar trouble may occur in a high-temperature gas flue or the like.
[0005]
As described above, the first requirement is to stabilize combustion in a refuse incinerator in order to achieve dioxin countermeasures. For that purpose, first, make sure that clinker is generated and adhered to the inner wall of the furnace wall. It is necessary to prevent it.
[0006]
On the other hand, in large-scale waste incinerators equipped with boiler equipment, the boiler water pipe is lowered to the combustion chamber of the waste incinerator, and a so-called water-cooled wall combustion chamber is used to prevent the generation and adhesion of clinkers to the combustion chamber wall. I am trying to do it.
However, in a refuse incinerator or the like not equipped with a boiler facility, it is necessary to prevent the generation and adhesion of clinkers by other measures. Generally, a so-called air-cooled refractory wall B as shown in FIGS. 3 and 4 is used. Have been.
[0007]
That is, the air-cooled refractory wall B of FIG. 3 has a square frame 2 of an appropriate size welded and fixed to the outer surface side of the inner steel plate 1 and a plurality of support bolts 3 protruding from the steel plate 1, into the frame 2. The refractory molded body 4 such as a molded brick inserted is retained and fixed by a support bolt 3 and a nut 5 screwed to the same, thereby forming a refractory wall body 6 and, at the same time, the inner steel plate 1 and the appropriate An air-cooled fire-resistant wall B is formed by providing an outer steel plate 7 at intervals and forming a space 8 between the steel plates 1 and 7 as a passage 8 for cooling air A, and supporting the refractory molded body 4. The rear side of the inner steel plate 1 to be fixed is cooled by the cooling air A.
In FIG. 3, reference numeral 9 denotes a filled refractory, 10 denotes an outer casing, and 11 denotes a heat insulating material provided between the outer steel plate 7 and the outer casing 10.
[0008]
In the air-cooled refractory wall B of FIG. 4, a support frame 13 having a support metal 3 for fixing the refractory molded body 4 is fixed to the support structure 12, and the support frame 13 is attached to the support frame 12. The refractory molded body 4 made of a molded brick body or a normal brick body is stopped and fixed via a support metal 35 or the like, thereby forming the refractory wall body 6 and maintaining a predetermined distance from the supporting frame 13. An air-cooled refractory wall B is formed by disposing the outer steel plate 7 and providing a cooling air passage 8 between the back side of the refractory wall body 6 and the outer steel plate 7. The back surface of the body 4 is directly cooled by the cooling air A.
[0009]
In the air-cooled refractory wall B shown in FIG. 4, the refractory molded body 4 is fixed by using a seal structure capable of escaping thermal expansion. , Are directly cooled by the cooling air A as described above.
4, 14 is a cooling air inlet, 15 is a cooling air outlet, and an outer casing 10 and a heat insulating material 11 are provided on the outer surface side of the outer steel plate 7 as in FIG. Have been.
[0010]
[Problems to be solved by the invention]
Each of the air-cooled refractory walls shown in FIGS. 3 and 4 can effectively prevent clinker generation and adhesion to some extent, and has excellent practical utility. However, the air-cooled refractory wall still has many problems to be solved as described below.
For example, the air-cooled refractory wall shown in FIG. 3 has a structure in which the refractory molding 4 is abutted and fixed to the outer surface side of the inner steel plate 1 via the support bolt 3. When a thermal cycle is applied to the bolt 3, a gap is generated in a contact surface between the inner steel plate 1 and the refractory molded body 4. As a result, the thermal conductivity deteriorates, the temperature of the outer surface of the refractory molded body (brick) 4 rises, the function of preventing clinker generation and adhesion decreases, and adhesion of the clinker occurs, Burning, cracking, falling off, etc., occur frequently.
[0011]
Further, in the air-cooled refractory wall of FIG. 4 described above, since the back side of the refractory molded body (brick) 4 is directly air-cooled, thermal conductivity does not deteriorate over time. No clinker is generated or adhered due to a rise in the outer surface temperature of the refractory molded body 4.
[0012]
However, the sealing structure for escaping the thermal expansion of the refractory molded body 4 deteriorates with time, and when the sealing performance deteriorates, the cooling air A leaks into the furnace. Abnormal combustion occurs in the leaked portion, causing a partial temperature rise. As a result, the clinker adheres to the portion where the temperature rises, or the refractory molded body (brick) 4 is burned. Moreover, the control of the amount of combustion air in the furnace is disturbed by the infiltration of the leaked air, and an event actually occurs in which stable combustion becomes difficult.
[0013]
The present invention relates to the above-mentioned problems in the conventional air-cooled refractory wall, that is, (a) a gap is formed between the inner steel sheet and the contact surface between the refractory molding and heat conductivity deteriorates with time; ) Resolves the problem that the sealing performance of the refractory molding deteriorates over time and the combustion air becomes unstable due to the cooling air leaked into the furnace. It is an object of the present invention to provide an air-cooled fire-resistant wall in which a furnace wall can be formed on the wall, and adhesion of a clinker to the wall surface and instability of combustion can be reliably prevented.
[0014]
[Means for Solving the Problems]
According to the first aspect of the present invention, a closed rectangular steel box 19 having a cooling air inlet 14 and a cooling air outlet 15 and having a rectangular cross section and an inner steel plate 1 of the steel box 19 are penetrated. An anchor 20 having its base end fixed inside the box 19 and a head protruding outward from the inner steel plate 1, and a fixed thickness in a state where the anchor 20 is wrapped around the outer surface of the inner steel plate 1. The refractory 21 is formed from an outer casing 10 disposed on the outer surface of the outer steel plate 7 of the steel plate box 19 with a heat insulating material 11 interposed therebetween. The basic configuration of the present invention is to cool the irregular-shaped refractory 21 via the inner steel plate 1 and the anchor 20 by the supplied cooling air A.
[0015]
The invention of claim 2 has a partition steel plate 16 in which the steel plate box 19 according to the invention of claim 1 is disposed inside and parallel to the inner steel plate 1 at an interval. A steel box 19 having passages 8a and 8b for cooling air A between the inner steel plate 1 and the outer steel plate 7, respectively, and the base end of the anchor 20 is fixed to the partition steel plate 16 and cooled by cooling air. In this case, the anchor 20 is directly cooled.
[0016]
According to a third aspect of the present invention, in the first or second aspect, the irregular-shaped refractory 21 is formed by filling the surface of the inner steel sheet 1 to a desired thickness, drying and solidifying. .
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic vertical cross-sectional view of an air-cooled fire-resistant wall according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view thereof. 1 and 2, the same members as those in FIGS. 3 and 4 are denoted by the same reference numerals.
1 and 2, 1 is an inner steel plate, 7 is an outer steel plate, 8 is a cooling air passage, 10 is an outer casing, 11 is a heat insulating material, 14 is a cooling air inlet, 15 is a cooling air outlet, and 16 is a cooling air outlet. Is a partition steel plate, 17a is an upper steel plate, 17b is a lower steel plate, 18a and 18b are side steel plates, 19 is a steel plate box, 20 is an anchor, 21 is an irregular refractory, and 22 is a blower for cooling air.
[0018]
1 and 2, an air-cooled refractory wall B according to the present invention includes a refractory wall body 6, an outer casing 10 and a heat insulating material 11 disposed outside the refractory wall body 6. In addition, the refractory wall 6 is a sealed steel plate having a square cross section formed of the inner steel plate 1, the outer steel plate 7, the partition steel plate 16, the upper steel plate 17a, the lower steel plate 17b, the side steel plates 18a and 18b, and the like. It is composed of a box body 19, an anchor 20, an irregular refractory 21 and the like.
[0019]
Inside the steel plate box 19, a partition steel plate 16 is provided in parallel with the inner steel plate 1 at a predetermined interval, and a space between the partition steel plate 16 and the inner steel plate 1 and the outer steel plate 7 is provided. Are formed with flow passages 8a and 8b.
Further, a cooling air inlet 14 and a cooling air outlet 15 communicating with the flow passages 8a and 8b are formed in a lower portion outside the steel plate box 19, respectively.
[0020]
The anchor 20 is disposed so as to penetrate the inner steel plate 1 with its head protruding inside the furnace, and the base end thereof is fixed to the inner surface of the partition steel plate 16.
[0021]
The irregular-shaped refractory 21 is formed of a silicon carbide-based refractory or the like, and is tightly fixed to the outer surface of the inner steel plate 1 by an anchor 20. That is, a kneaded material of a refractory material is laminated and filled to a predetermined thickness in a state in which the head of the anchor 20 is wrapped inside the furnace of the inner steel plate 1, and then the refractory material is dried and solidified. Is formed.
In addition, since the construction method itself for forming the irregular-shaped refractory 21 is known, the description thereof is omitted here.
[0022]
The material of the amorphous refractory 21 may be any material as long as it has heat resistance, corrosion resistance, sticking property, and high heat conductivity. In the present embodiment, the silicon carbide refractory or magnesia material is used. Chrome-based refractories, alumina-based refractories, silica-based refractories, and the like are used.
Although not shown in the present embodiment, it is a matter of course that reinforcing ribs are appropriately provided inside the steel plate box 19.
Further, in the embodiment of FIG. 1, the case where the air-cooled refractory wall of the present invention is used as a furnace wall of a stoker-type incinerator is described, but the air-cooled refractory wall according to the present invention is a fluidized-bed furnace or a melting furnace. And can be applied to a wall of a high-temperature exhaust gas passage.
[0023]
The cooling air A from the blower 22 flows into the steel plate box 19 from the air inlet 14, and flows upward in the air passage 8 a formed between the partition steel plate 16 and the inner steel plate 1, The amorphous refractory 21 is cooled via the anchor 20 by cooling the base of the anchor 20 while cooling the amorphous refractory 21 via the inner steel plate 1.
The cooling air A heated by ascending in the air passage 8a reverses near the upper steel plate 17, descends through the passage 8b, and is led out from the air outlet 15 to the outside.
[0024]
【The invention's effect】
In the present invention, the irregular refractory 21 is laminated and fixed to the furnace inner surface of the inner steel plate 1 of the steel plate box 19 to which the anchor 20 is fixed, and the irregular refractory 21 is attached to the inner steel plate 1 by the anchor 20. While being fixedly held, the cooling air A flows between the inner steel plate 1 and the partition steel plate 16, and through the inner steel plate 1 and the base end of the anchor 20 protruding into the cooling air passage 8a, the irregular refractory The object 21 is configured to be cooled.
As a result, the amorphous refractory 21 is efficiently cooled by the cooling air A, and the amorphous refractory 21 is more firmly attached to the outer surface of the inner steel plate 1 as compared with the case where the refractory molding 4 is used. Since there is no gap between the fixed refractories, the cooling performance of the amorphous refractory does not deteriorate over time.
Thereby, in the cooling type refractory wall according to the present invention, clinker is not generated and adhered to the surface of the refractory material. As a result, the flow of the refuse in the incinerator is not hindered and the combustion state is not unstable, so that the dioxin countermeasures can be more reliably achieved.
The present invention has excellent practical utility as described above.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a part of an air-cooled fire-resistant wall according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a part of the air-cooled refractory wall of FIG.
FIG. 3 is a schematic longitudinal sectional view showing an example of a conventional air-cooled fire-resistant wall.
FIG. 4 is a schematic longitudinal sectional view showing another example of the conventional air-cooled fire-resistant wall.
[Explanation of symbols]
A is cooling air, B is an air-cooled refractory wall, 1 is an inner steel plate, 6 is a refractory wall, 7 is an outer steel plate, 8 is a cooling air passage, 10 is an outer casing, 11 is a heat insulating material, and 14 is cooling. An air inlet, 15 is a cooling air outlet, 16 is a partition steel plate, 17a is an upper steel plate, 17b is a lower steel plate, 18a and 18b are side steel plates, 19 is a steel plate box, 20 is an anchor, 21 is an irregular refractory, 22 is a blower.

Claims (3)

A sealed steel box having a rectangular cross section with a cooling air inlet and a cooling air outlet, and an inner steel plate of the steel box is penetrated, and the base end thereof is placed inside the box. An anchor having a fixed and head protruding outward from the inner steel plate, an irregular refractory laminated and fixed to a constant thickness in a state of wrapping the anchor around the outer surface of the inner steel plate, and an outer surface of the steel plate box An outer casing disposed on the outer surface side of the steel plate with a heat insulating material interposed therebetween, and cooling the irregular shaped refractory via the inner steel plate and the anchor by cooling air supplied from a cooling air inlet. An air-cooled fire-resistant wall characterized by: The steel plate box has a partition steel plate disposed inside and in parallel with the inner steel plate at an interval, and a steel plate made as a passage for cooling air between the partition steel plate, the inner steel plate, and the outer steel plate. The air-cooled fire-resistant wall according to claim 1, wherein the air-cooled fire-resistant wall according to claim 1, wherein the air-cooling type fire-resistant wall is configured to be a box body and to fix the base end portion of the anchor to a partition steel plate and directly cool the anchor with cooling air. The air-cooled fire-resistant wall according to claim 1 or 2, wherein the irregular-shaped refractory is formed by filling the surface of the inner steel plate to a desired thickness, drying and solidifying the refractory.

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