JP2004092965A - Structure for preventing excess deformation of refractory material structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for preventing excess deformation of a refractory material structure capable of preventing excess deformation and the like of the refractory material structure with a simple structure. <P>SOLUTION: A cyclone 3 of a circulation fluidized layer boiler is applied to an inner wall of a steel plate casing 10 as a so-called refractory material structure supported by a stainless anchor 12 via a heat insulating material 11 composed of glass fiber and the like, and adhered by a joint 14 for absorbing heat elongation between adjacent multiple plate-like refractory materials 13 composed of ceramics and the like. In the joint 14, a horizontal joint part is arranged diagonally downwards as a structure for preventing excess deformation due to thermal elongation of the refractory material 13. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for preventing excessive deformation of a refractory structure such as a cyclone of a circulating fluidized bed boiler.
[0002]
[Prior art]
Conventionally, a circulating fluidized bed boiler (CFB) has been widely used as a combustion or boiler for burning coal, dewatered sludge, municipal solid waste, and the like. Such a circulating fluidized-bed boiler is provided with a cyclone for separating a combustion gas and fluidized sand at the outlet side of a fluidized-bed furnace (combustor) provided with a fluidized-bed heat exchanger (boiler) and the like. It returns to the fluidized-bed heat exchanger or the fluidized-bed furnace via a seal pot or the like, and functions as an incinerator or a combustion boiler for municipal solid waste.
[0003]
As shown in FIG. 5, the cyclone is provided on the inner wall of the casing 100 with the heat insulating material 101 interposed therebetween and supported by the anchor 102 so that a large number of plate-like refractory materials 103 are interposed between the refractory materials 103 adjacent to each other. Is constructed as a so-called refractory material structure in which joints 104 are arranged and attached.
[0004]
[Problems to be solved by the invention]
However, in the conventional cyclone (refractory material structure) as described above, fluidized sand separated from the combustion gas enters the joints 104 during the high-temperature operation of the circulating fluidized-bed boiler and the like, and this gradually increases. When deposited, the thermal expansion of the refractory material 103 cannot be absorbed, and eventually the cyclone is excessively deformed or the supporting steel frame is excessively bent due to, for example, exceeding the allowable value of the expansion section installed below the cyclone. There is a problem that damage is caused.
[0005]
Therefore, an object of the present invention is to provide a structure for preventing excessive deformation of a refractory material structure that can prevent excessive deformation of the refractory material structure with a simple structure.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the structure for preventing excessive deformation of a refractory material structure according to the present invention has a structure in which a large number of plate-like refractory materials are thermally supported between adjacent refractory materials by supporting an inner wall of a casing with a heat insulating material and an anchor. In a refractory material structure attached with stretch joints for absorbing elongation, a structure for preventing excessive deformation due to thermal elongation of the refractory material is provided.
[0007]
In addition, as a structure for preventing excessive deformation due to thermal expansion of the refractory material, a horizontal joint portion of the joint is constructed obliquely downward.
[0008]
Further, as the structure for preventing excessive deformation due to thermal expansion of the refractory material, the anchor is installed obliquely to the direction of thermal expansion of the refractory material.
[0009]
Further, as a structure for preventing excessive deformation due to thermal expansion of the refractory material, a non-deformable portion is partially provided in the heat insulating material.
[0010]
Further, the refractory material structure is a cyclone of a circulating fluidized bed boiler.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the structure for preventing excessive deformation of a refractory material structure according to the present invention will be described in detail with reference to the drawings using examples.
[0012]
[First embodiment]
FIG. 1 is a schematic configuration diagram of a circulating fluidized-bed boiler showing a first embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a portion A (cyclone inner wall portion) of FIG.
[0013]
As shown in FIG. 1, in a circulating fluidized bed boiler, a fluidized bed furnace (combustor) 2 provided with a fluidized bed heat exchanger 1 for exchanging heat with boiler water introduces primary air from below to remove silica sand and the like. After the primary combustion is performed by fluidly mixing the fluidized sand and the burned material, secondary air is introduced into the freeboard section 2a above the primary sand to perform secondary combustion, thereby completing the combustion of the combustible gas.
[0014]
Then, the combustion gas heated to a high temperature by the combustion is guided to the cyclone 3 together with the fluidized sand. After being separated into the combustion gas and the fluidized sand by the cyclone 3, the combustion gas is guided to the rear smoke passage 4. After heat exchange is performed between the primary air and the secondary air introduced into the fluidized bed furnace (combustor) 2 in the rear heat exchanger 5, fly ash and the like are removed through a bag filter (not shown), and then not shown. Released to the atmosphere by chimneys. On the other hand, the fluidized sand separated by the cyclone 3 is directly returned to the fluidized-bed furnace (combustor) 2 by the seal pot 6 via the hot recycle pipe 7a, and the fluidized sand separated by the cyclone 3 to the fluidized-bed heat exchanger 1 via the cold recycle pipe 7b. Distribution control is performed for returning items.
[0015]
As shown in FIG. 2, the cyclone 3 has a large number of plate-like refractory materials 13 made of ceramic or the like supported on an inner wall of a steel plate casing 10 through a heat insulating material 11 made of glass fiber or the like and supported by an anchor 12 made of stainless steel. Are constructed as a so-called refractory material structure in which joints 14 for absorbing thermal expansion are arranged between refractory materials 13 adjacent to each other.
[0016]
And, as the structure for preventing excessive deformation due to thermal expansion of the refractory material 13, a horizontal joint part of the joints 14 is obliquely directed downward.
[0017]
Therefore, even when the fluidized sand separated from the combustion gas in the cyclone 3 enters the joint 14 during high-temperature operation of the circulating fluidized-bed boiler or the like, it hardly accumulates by falling due to vibration or the like, and the refractory material 13 Thermal elongation can be favorably absorbed over a long period of time. As a result, as in the conventional case, the thermal expansion of the refractory material 13 exceeds the allowable value of the expansion section (not shown) installed below the cyclone 3, and the cyclone 3 is excessively deformed or the supporting steel frame is excessively large. No bending damage occurs.
[0018]
[Second embodiment]
FIG. 3 is a sectional view of a cyclone inner wall showing a second embodiment of the present invention.
[0019]
This is because the anchor 12 in the first embodiment is inclined obliquely upward with respect to the direction of thermal expansion of the refractory material 13 (see the arrow in the figure) as a structure for preventing excessive deformation due to thermal expansion of the refractory material 13 and welding to the casing 10. This is an example.
[0020]
According to this, the rigidity of the anchor 12 is increased, and the downward thermal expansion of the refractory material 13 is suppressed, and the same effect as in the first embodiment can be obtained.
[0021]
[Third embodiment]
FIG. 4 is a sectional view of a cyclone inner wall showing a third embodiment of the present invention.
[0022]
This is an example in which a non-deformed portion 11a is partially provided in the heat insulating material 11 in the first embodiment as a structure for preventing excessive deformation due to thermal expansion of the refractory material 13. As the non-deformed portion 11a, a hard heat insulating material 11 may be used, or a ring-shaped metal plate may be used.
[0023]
According to this, the mounting strength of the heat insulating material 11 is increased, and the thermal expansion downward of the refractory material 13 is suppressed, and the same effect as in the first embodiment can be obtained.
[0024]
It should be noted that the present invention is not limited to the above embodiments, and various changes can be made without departing from the scope of the present invention. For example, the excessive deformation prevention structure of the present invention may be applied not only to the inner wall of the cyclone but also to the inner walls of the seal pot 6, the hot recycle pipe 7a and the cold recycle pipe 7b. In addition, the present invention is not limited to the circulating fluidized bed boiler, and can be applied to a refractory material structure such as another facility.
[0025]
【The invention's effect】
As described above in detail with the embodiment, according to the first aspect of the present invention, a large number of plate-like refractory materials are supported between the refractory materials adjacent to each other by supporting the inner wall of the casing with the heat insulating material and the anchor. In the refractory material structure bonded with stretch joints for absorbing elongation, since the structure for preventing excessive deformation due to thermal expansion of the refractory material is applied, it is possible to prevent excessive deformation of the refractory material structure with a simple structure. it can.
[0026]
According to the invention of claim 2, as the structure for preventing excessive deformation due to thermal expansion of the refractory material, of the joints, the horizontal joint is constructed obliquely downward, so that even if liquid sand or the like enters the joints, It hardly accumulates when dropped due to vibrations or the like, and the thermal expansion of the refractory material can be favorably absorbed over a long period of time, and the same effect as the first aspect of the invention can be obtained.
[0027]
According to the third aspect of the present invention, as the structure for preventing excessive deformation due to thermal expansion of the refractory material, the anchor is installed obliquely with respect to the direction of thermal expansion of the refractory material. Is suppressed, and the same effect as the first aspect of the invention can be obtained.
[0028]
According to the invention of claim 4, as the structure for preventing excessive deformation due to thermal elongation of the refractory material, the heat insulating material is partially provided with a non-deformed portion, so that the mounting strength of the heat insulating material is increased and the heat insulating material is positioned below the refractory material. Is suppressed, and the same effect as the first aspect of the invention can be obtained.
[0029]
According to the fifth aspect of the present invention, since the refractory material structure is a cyclone of a circulating fluidized bed boiler, the casing effectively absorbs the thermal elongation of the refractory material, which is about 850 ° C. higher than about 60 ° C. Or it can be suppressed and is effective.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a circulating fluidized bed boiler showing a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a portion A (cyclone inner wall portion) of FIG.
FIG. 3 is a sectional view of an inner wall of a cyclone showing a second embodiment of the present invention.
FIG. 4 is a sectional view of a cyclone inner wall showing a third embodiment of the present invention.
FIG. 5 is a cross-sectional view of a conventional cyclone inner wall portion.
[Explanation of symbols]
1 fluidized bed heat exchanger 2 fluidized bed furnace (combustor)
3 Cyclone 4 Rear smoke vent 5 Rear heat exchanger 6 Seal pot 10 Casing 11 Insulation material 12 Anchor 13 Refractory material 14 Joint

Claims (5)

In a refractory material structure in which a large number of plate-like refractory materials are adhered to the inner wall of a casing with an insulating material interposed therebetween and anchored with thermal expansion-absorbing joints between adjacent refractory materials, the heat of the refractory material A structure for preventing excessive deformation of a refractory material structure, which is provided with a structure for preventing excessive deformation due to elongation. 2. The structure for preventing excessive deformation of a fire-resistant material structure according to claim 1, wherein a horizontal joint portion of the joint is obliquely downwardly directed as the structure for preventing excessive deformation due to thermal expansion of the fire-resistant material. 2. The structure for preventing excessive deformation of a refractory material structure according to claim 1, wherein the anchor is installed at an angle to the direction of thermal expansion of the refractory material as the structure for preventing excessive deformation due to thermal expansion of the refractory material. . 2. The structure for preventing excessive deformation of a fire-resistant material structure according to claim 1, wherein the heat-insulating material is partially provided with a non-deformable portion as the structure for preventing excessive deformation due to thermal expansion of the fire-resistant material. 5. The structure according to claim 1, wherein the refractory material structure is a cyclone of a circulating fluidized bed boiler.

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