JP3204301U - chimney - Google Patents

Abstract

[PROBLEMS] To improve the heat insulation effect of a rectangular tubular heat-resistant wall to suppress an increase in radiant heat loss and a decrease in exhaust gas suction capability, and to prevent a chimney configured to prevent a turtle-shell hair crack or a steam explosion. provide. A chimney is constructed by vertically stacking a plurality of square tube chimney units each having a rectangular heat-resistant wall 2 having a rectangular closed cross section in a projection plane shape. The rectangular heat-resistant wall 2 is made of a soft heat insulating material made of a hard heat insulating material 20 made of calcium silicate plates 20a, 20b, 20c, 20d and a fibrous heat insulating material made of at least one of rock wool, glass fiber, ceramic fiber, and the like. The material 21 is composed of a composite structure disposed adjacent to each other in the thickness direction. [Selection] Figure 2

Description

  The present invention relates to a chimney and is suitable for directing and radiating exhaust gas from a gas turbine engine or diesel engine that drives an emergency generator installed in a building, exhaust gas from a boiler, or exhaust gas from an industrial waste incinerator. Related to the chimney.

  Conventionally, as a chimney for guiding and exhausting exhaust gas from a gas turbine engine or a diesel engine that drives an emergency generator installed in a building, exhaust gas from a boiler, or exhaust gas from an industrial waste incinerator, for example, Patent Document 1 Is provided.

  The chimney described in Patent Document 1 is constructed by vertically stacking a plurality of square cylindrical chimney units each having a rectangular cylindrical heat-resistant wall having a rectangular closed cross-section as a projection plane shape. Is formed into a square cylindrical shape by combining the two end portions in the width direction of the four calcium silicate plates at right angles by an engaging / butting structure that engages and butts each other.

  The square cylindrical heat-resistant wall of this type of chimney needs to have a configuration having high rigidity and high heat insulation. However, the conventional square cylindrical heat-resistant wall is constituted by a single structure of a hard heat insulating material made of a calcium silicate plate having high rigidity but low heat insulation, and this single structure is 250 ° C. to 650 ° C. due to exhaust gas. It will bear high load heat. For this reason, the surface temperature of the square tubular heat-resistant wall rises excessively, and accordingly, the surface temperature of the square tubular chimney unit and the chimney rises excessively to increase the surface loss (radiation heat loss). As a result, the exhaust gas temperature decreases in the chimney, reducing the exhaust gas suction capacity of the chimney, the temperature of the room in contact with the surface of the square cylindrical chimney unit increases, and the indoor temperature management is hindered. If you accidentally touch the surface of the chimney, there is a risk of burns.

  Therefore, conventionally, by increasing the thickness of the calcium silicate plate and improving the heat insulation performance, radiation heat loss due to excessive rise in the surface temperature of the square cylindrical chimney unit, reduction in the exhaust gas suction capacity of the chimney, and the room temperature I try to suppress the rise of.

  By the way, in the chimney, when the calcium silicate plate is exposed to the exhaust gas, the plate bends inward (toward the center of the chimney) due to thermal expansion, and conversely, when the operation of the exhaust gas generation source is stopped, Bends outward (toward the center of the chimney). However, the force that resists bending increases as the thickness increases, so that bending associated with thermal expansion and contraction is hindered. As a result, the stress increases and turtle-shaped hair cracks are generated, which break down as time progresses. For this reason, the rectangular tubular heat-resistant wall, which has improved heat insulation performance depending on the increase in the thickness of the calcium silicate plate, is prone to breakage due to the turtle shell-shaped hair crack, and the square tubular chimney unit and chimney follow this. There is a risk of destruction.

  On the other hand, some of the water that flows into the rectangular tubular heat-resistant wall and some of the moisture such as dew condensation that forms on the inner surface of the square tubular heat-resistant wall when the chimney is suspended in cold areas in the winter are on the calcium silicate plate. included. When the calcium silicate plate containing water is exposed to exhaust gas, the water boils and the vapor pressure rises. Here, when the thickness of the calcium silicate plate is thick, the water content increases and a large amount of water boils. Moreover, as the thickness increases, the steam ejection resistance increases. Therefore, the vapor pressure suddenly rises to a level exceeding the explosion reference value, causing a steam explosion. For this reason, the square cylindrical heat-resistant wall whose thermal insulation performance is improved depending on the increase in the thickness of the calcium silicate plate is prone to steam explosion, and the square cylindrical chimney unit and chimney are steam-expanded following this. Have a fear.

  On the other hand, when the thickness of the calcium silicate plate is increased, the weight of the square tubular heat-resistant wall and the square tubular chimney unit is increased, so that the workability of the chimney construction is deteriorated and the chimney construction cost is increased. In addition, the weight of the rectangular cylindrical heat-resistant wall and each rectangular cylindrical chimney unit is increased, and there is a drawback in that the load on the casing in the building becomes high and adversely affects the casing. Furthermore, in the rectangular cylindrical heat-resistant wall constructed by combining the four calcium silicate plates at right angles by the above-described engagement / butting structure, exhaust gas leaks from a small gap formed on the mating surface of the engagement / butting structure. As a result, the indoor environment may be adversely affected.

Japanese Patent No. 5798676

  The present invention has been made in view of the above circumstances, and enhances the heat insulation effect of the rectangular tubular heat-resistant wall to suppress an increase in radiant heat loss and a reduction in exhaust gas sucking capacity, and to break due to a turtle-shaped hair crack. Alternatively, it is intended to provide a chimney configured to prevent steam explosion.

In order to achieve the above object, the chimney according to the present invention is a chimney constructed by stacking a plurality of rectangular cylindrical chimney units each having a rectangular cylindrical heat-resistant wall having a rectangular closed cross section in a projection plane shape,
The rectangular tubular heat-resistant wall is constituted by a composite structure in which a hard heat insulating material and a soft heat insulating material are arranged adjacent to each other in the thickness direction.

  The rectangular tubular heat-resistant wall having the above-described configuration can obtain a high heat insulating effect by the soft heat insulating material. As a result, an increase in radiant heat loss and a reduction in exhaust gas suction capacity are suppressed, and it is allowed to set the thickness of the hard heat insulating material thin.

  When the thickness of the hard heat insulating material is reduced, a force against bending due to thermal expansion and contraction is reduced, and the hard heat insulating material is easily bent due to thermal expansion and thermal contraction, so that the stress is greatly reduced. As a result, breakage of the square tubular heat-resistant wall due to the turtle shell-shaped hair crack is prevented, and breakage of the square tubular chimney unit and the chimney is also prevented.

  On the other hand, since the hard heat insulating material with a small thickness has a small water content, a small amount of water will boil, and when the thickness is reduced, the resistance to jetting of steam becomes smaller. For this reason, the vapor pressure does not increase to the explosion reference value or a level in the vicinity thereof. As a result, the steam explosion of the square tubular heat-resistant wall is prevented, and the steam explosion of the square cylinder chimney unit and the chimney is also prevented.

  On the other hand, the weight of the square cylindrical heat-resistant wall and the square cylindrical chimney unit is reduced corresponding to the reduction in the thickness of the hard heat insulating material, so that the handling becomes easy and the workability of the chimney construction is improved. Construction cost can be reduced. Further, corresponding to the weight reduction of the square tubular heat-resistant wall and the square tubular chimney unit, the load applied to the housing in the building is reduced, and the adverse effect on the building housing is mitigated.

  The hard heat insulating material is made of a calcium silicate plate, and the soft heat insulating material is made of a fibrous heat insulating material. According to this, a high heat insulation effect is acquired by the soft heat insulating material which consists of a fibrous heat insulating material. For this reason, an increase in radiant heat loss and a reduction in exhaust gas suction capacity are suppressed, and it is allowed to set the thickness of the hard heat insulating material made of the calcium silicate plate thin.

  The square tubular heat-resistant wall is adjacent to the soft heat insulating material, the hard heat insulating material arranged adjacent to one surface in the thickness direction of the soft heat insulating material, and the remaining one surface in the thickness direction of the soft heat insulating material. It is comprised by the composite structure with the steel plate arrange | positioned. This square heat-resistant wall can obtain a high rigidity by the cooperation of the hard heat insulating material and the steel plate, and can obtain a high heat insulating effect by the soft heat insulating material. Therefore, an increase in radiant heat loss and a reduction in exhaust gas uptake capacity are suppressed, and it is allowed to set the thickness of the hard insulation material thin, and the destruction due to the turtle-shaped hair crack and the steam explosion are effectively prevented. . In addition, the square cylindrical heat-resistant wall having this configuration is suitable for construction of a small-diameter chimney.

  The rectangular tubular heat-resistant wall is composed of a composite structure of the soft heat insulating material and a pair of the hard heat insulating materials disposed adjacent to each other on both sides in the thickness direction of the soft heat insulating material. The square tubular heat-resistant wall can have high rigidity by a pair of hard heat insulating materials, and can have a high heat insulating effect by a soft heat insulating material. Therefore, an increase in radiant heat loss and a reduction in exhaust gas uptake capacity are suppressed, and it is allowed to set the thickness of the hard insulation material thin, and the destruction due to the turtle-shaped hair crack and the steam explosion are effectively prevented. . In addition, the square tubular heat-resistant wall having this configuration is suitable for construction of a large-diameter chimney.

  The thickness of the hard heat insulating material is set in a range of 30 mm to 50 mm, preferably 35 mm. According to this, it is possible to prevent the destruction due to the turtle-shaped hair crack and the steam explosion. If the thickness is less than 30 mm, the rigidity of the hard heat insulating material is insufficient, and the construction of a high-rigidity chimney is hindered. If the thickness exceeds 50 mm, the induction rate of tortoiseshell hair cracks and steam explosions is dramatically increased. Get higher.

  According to the chimney according to the present invention, since the square heat-resistant wall is composed of a composite structure of a hard heat insulating material and a soft heat insulating material, a high heat insulating effect can be obtained by the soft heat insulating material. As a result, an increase in radiant heat loss and a reduction in exhaust gas uptake capacity are suppressed, and it is allowed to set the thickness of the hard heat insulating material thin, and it is possible to prevent destruction due to turtle-shaped hair cracks or steam explosion. It becomes possible.

(A) It is a front view which shows a part of 1st Embodiment of the chimney which concerns on this invention. (B) It is a front view which shows a part of 2nd and 3rd embodiment of the chimney which concerns on this invention. It is a cross-sectional top view which expands and shows 1st Embodiment of the square cylindrical heat-resistant wall applied to the chimney which concerns on this invention. It is a cross-sectional top view which expands and shows 2nd Embodiment of the square cylindrical heat-resistant wall applied to the chimney which concerns on this invention. It is a cross-sectional top view which expands and shows 3rd Embodiment of the square cylindrical heat-resistant wall applied to the chimney which concerns on this invention.

  Hereinafter, a preferred embodiment of a chimney according to the present invention will be described with reference to the drawings. 1A is a front view showing a part of the first embodiment of the chimney according to the present invention, and FIG. 1B is a front view showing a part of the second and third embodiments of the chimney according to the present invention. FIG. 2 is an enlarged cross-sectional plan view showing a first embodiment of a rectangular tubular heat-resistant wall applied to the chimney according to the present invention, and FIG. 3 is a perspective view of the rectangular tubular heat-resistant wall applied to the chimney according to the present invention. FIG. 4 is an enlarged cross-sectional plan view showing a third embodiment of a square tubular heat-resistant wall applied to the chimney according to the present invention.

  1A and 2, a chimney 1 is a rectangular cylindrical chimney unit (hereinafter referred to as a square cylindrical heat resistant wall) 2 having a rectangular closed cross section as a projection plane shape (hereinafter referred to as a square cylindrical heat resistant wall). In the description of the above, a plurality of 1A, 1B, and 1C of rectangular cylinder chimney units) are stacked up and down to a predetermined height by a butting structure, and the rectangular cylinder chimney units 1A and 1B facing each other directly above and below It is constructed by connecting 1B and 1C by the connecting means 4. The chimney 1 is installed in a vertical position in a colonnade of a building that is not shown, with its upper end protruding to the rooftop of the building, and the lower end is installed inside the building. Exhaust ducts of exhaust gas generation sources such as gas turbine engines, diesel engines, boilers, and industrial waste incinerators that drive industrial generators are connected.

  The connecting means 4 includes a lower flange 4a made of angle steel wound around the outer periphery of the lower end portion of each square tube chimney unit 1A, 1B, 1C and fixed by welding (however, the lower end portion of the square tube chimney unit 1C and the A lower flange wound around and fixed to the outer periphery of the lower end portion is not shown), and an upper flange 4b made of angle steel wound around the upper end portion of each square tube chimney unit 1A, 1B, 1C and fixed by welding. However, the upper flange of the rectangular chimney unit 1A and the upper flange wound and fixed to the outer periphery of the upper end are not shown), and the lower flange 4a and the upper flange 4b are fastened to each other at equal intervals in the circumferential direction. A plurality of vertical fastening members 4c made of bolts and nuts are provided.

  The rectangular tubular heat-resistant wall 2 is composed of a composite structure in which a hard heat insulating material 20, a soft heat insulating material 21, and a steel plate 22 are arranged adjacent to each other in the thickness direction. In the first embodiment, the soft heat insulating material 21, the hard heat insulating material 20 disposed adjacent to the inner surface of the soft heat insulating material 21, and the soft heat insulating material disposed adjacent to each other on the outer periphery of the soft heat insulating material 21. A square tubular heat-resistant wall 2 is constituted by a composite structure with a steel plate 22 that tightly surrounds 21. The square tubular heat-resistant wall 2 is provided in each square tubular chimney unit 1A, 1B, 1C.

  The hard heat insulating material 20 is composed of four calcium silicate plates 20a, 20b, 20c, and 20d, and has an engagement / butting structure 5 in which both end portions in the width direction of the respective calcium plates 20a to 20d are engaged with each other. Combining at right angles to form a rectangular tube shape, the thickness of each of the calcium plates 20a to 20d, that is, the thickness t of the hard heat insulating material 20, is set to a range of 30 mm to 50 mm, preferably 35 mm.

  The soft heat insulating material 21 is composed of a fibrous heat insulating material made of at least one of rock wool, glass fiber, ceramic fiber and the like having a high heat insulating effect, and the thickness t1 is an appropriate size corresponding to the exhaust gas temperature. Is set to For example, when the exhaust gas temperature is 250 ° C., t1 = 25 mm, 500 ° C., t1 = 50 mm, 600 ° C., t1 = 75 mm, and 650 ° C., t1 = 100 mm. The steel plate 22 is made of a galvanized steel plate having a thickness of 2.6 mm to 9 mm.

  The rectangular tubular heat-resistant wall 2 having the above structure has a simple structure, but high rigidity is obtained by the cooperation of the hard heat insulating material 20 and the steel plate 22, and a high heat insulating effect is obtained by the soft heat insulating material 21. . Therefore, not only an increase in radiant heat loss and a reduction in exhaust gas suction capacity are suppressed, but it is allowed to set the thickness t of the hard heat insulating material 20 to be thin, thereby preventing destruction due to a turtle-shaped hair crack or steam explosion. Therefore, it is possible to prevent the destruction or steam explosion of each of the square cylindrical chimney units 1A, 1B, 1C and the chimney 1.

  Corresponding to the reduction of the thickness t of the hard heat insulating material 20, the weight of the square tubular heat-resistant wall 2 and the square tubular chimney units 1A, 1B, 1C is reduced, so that the handling becomes easy and the workability of the construction of the chimney is improved. As a result, the construction cost of the chimney 1 can be reduced. Further, corresponding to the weight reduction of the square tubular heat-resistant wall 2 and the square tubular chimney units 1A, 1B, and 1C, the load applied to the housing in the building is reduced, and the adverse effect on the building housing is mitigated. Furthermore, although the width direction both ends of the four calcium silicate plates 20a to 20d are combined at right angles by the engagement / butting structure 5, a small gap (not shown) is formed on the mating surface. This gap is blocked by the ingress of the fibrous component of the soft heat insulating material 21 and the outer periphery of the soft heat insulating material 21 is tightly surrounded by the steel plate 22, so that exhaust gas leaks and adversely affects the indoor environment. Will not be affected. In addition, the chimney 1 constructed by stacking a plurality of rectangular tube chimney units 1A, 1B, 1C of the rectangular tube-shaped heat-resistant wall 2 according to the first embodiment vertically has a side length of less than 500 mm. It is suitable for construction of small-diameter chimneys.

Next, a second embodiment of the square tubular heat-resistant wall 2 applied to the chimney 1 according to the present invention will be described with reference to FIG. 2 that are the same as or equivalent to those in the first embodiment in FIG. 2 are assigned the same reference numerals, and detailed descriptions of the overlapping structures are omitted.
In FIG. 1 (B) and FIG. 3, the rectangular tubular heat-resistant wall 2 is composed of a composite structure in which a hard heat insulating material 20, a soft heat insulating material 21, and a steel plate 22 are arranged adjacent to each other in the thickness direction. In the second embodiment, the soft heat insulating material 21, the steel plate 22 disposed adjacent to the inner periphery of the soft heat insulating material 21, and the soft heat insulating material 21 disposed adjacent to each other on the outer periphery of the soft heat insulating material 21. The square tubular heat-resistant wall 2 is constituted by a composite structure with the hard heat insulating material 20 surrounding the square, and the square tubular heat-resistant wall 2 is provided in each square tubular chimney unit 1A, 1B, 1C.

  The steel plate 22 is made of a stainless steel plate, and includes four substrates 22a, 22b, 22c, and 22d having a thickness of 0.6 mm to 1.5 mm. Both end portions in the width direction of the substrates 22a and 22b that face each other in FIG. 3 on both sides of the substrates 22c and 22d facing each other on the left and right in FIG. 3 (both ends in the vertical direction in FIG. 3) ) To form a rectangular tube shape.

  The hard heat insulating material 20 is composed of four calcium silicate plates 20a, 20b, 20c, and 20d, and the widthwise opposite end surfaces of the calcium silicate plates 20a and 20b facing each other in the vertical direction in FIG. Each of the calcium silicate plates 20c and 20d facing each other is formed into a rectangular tube shape by contacting the inner surfaces of both ends in the width direction (in FIG. 3, the inner surfaces of both ends in the vertical direction). A corner material 6 made of angle steel is vertically installed in contact with the outer surfaces of the two corners, and four horizontal members 7 made of angle steel are horizontally arranged on the outer surface of the corner material 6 with vertical intervals. It is bridged and fixed. In addition, by means of a plurality of horizontal fastening members 8 made of stainless steel bolts and nuts (not shown in FIG. 1B), the width direction of the left and right horizontal members 7 and the substrates 22c and 22d, respectively. The soft heat insulating material 21 is sandwiched between the hard heat insulating material 20 and the stainless steel plate 22 by connecting and fastening the mating allowances 22x of the substrates 22a and 22b that overlap both ends and the inner surfaces of the both ends in the width direction.

  The square tubular heat-resistant wall 2 having the above structure has a simple structure, and high rigidity is obtained by the cooperation of the hard heat insulating material 20, the steel plate 22, the corner material 6, and the plurality of horizontal fastening members 8, A high heat insulating effect is obtained by the soft heat insulating material 21. Therefore, not only an increase in radiant heat loss and a reduction in exhaust gas suction capacity are suppressed, but it is allowed to set the thickness t of the hard heat insulating material 20 to be thin, thereby preventing destruction due to a turtle-shaped hair crack or steam explosion. Therefore, it is possible to prevent the destruction or steam explosion of each of the square cylindrical chimney units 1A, 1B, 1C and the chimney 1, and furthermore, the rectangular cylindrical heat resistant wall of the first embodiment described with reference to FIG. Has the same action and effect as 2. In addition, the chimney 1 constructed by laminating a plurality of square tube chimney units 1A, 1B, 1C of the square tube-shaped heat-resistant wall 2 according to the second embodiment vertically is also less than 500 mm on a side. It is suitable for construction of small-diameter chimneys.

Next, a third embodiment of the square tubular heat-resistant wall 2 applied to the chimney 1 according to the present invention will be described with reference to FIG. 2 and 3, the same or corresponding parts are denoted by the same reference numerals, and detailed description of the overlapping structure is omitted.
In FIG. 1 (B) and FIG. 4, the rectangular heat-resistant wall 2 includes a soft heat insulating material 21 and first and second hard heat insulating materials 20A disposed adjacent to each other on both sides in the thickness direction of the soft heat insulating material 21. This square tubular heat-resistant wall 2 is provided in each of the square tubular chimney units 1A, 1B, 1C.

  The first hard heat insulating material 20A is composed of four calcium silicate plates 20a, 20b, 20c, and 20d. In FIG. 4, the bottom surfaces of the calcium silicate plates 20a and 20b facing each other in the vertical direction are respectively shown in FIG. In FIG. 4, the two ends of the calcium silicate plates 20c, 20d facing each other in the width direction are brought into contact with each other in the width direction (both ends in the vertical direction in FIG. 4). 4 consists of four calcium silicate plates 20a ′, 20b ′, 20c ′, 20d ′, and the widthwise opposite end surfaces of the calcium silicate plates 20a ′, 20b ′ facing each other in FIG. Each of the calcium silicate plates 20c ′ and 20d ′ facing each other on the left and right sides is brought into contact with the inner surfaces of both ends in the width direction (in FIG. 4, the inner surfaces of both ends in the vertical direction). And is configured in a rectangular tube shape.

  The corner material 9 made of small angle steel circumscribes the inner surfaces of the four corner portions of the first hard heat insulating material 20A and is vertically installed, and circumscribes the inner surfaces of the center portions in the width direction of the calcium silicate plates 20a and 20b. A reinforcing material 10 made of small angle steel is vertically installed, and a corner material 6A made of angle steel is vertically installed in contact with the outer surfaces of the four corners of the second hard heat insulating material 20B. The four horizontal members 7A made of angle steel are horizontally stretched and fixed on the outer surface of the outer surface of the outer surface.

  Further, the left and right horizontal members 7A and the corner material 9 are connected and fastened to each other by a plurality of horizontal fastening members 8A made of stainless steel bolts and nuts (not shown in FIG. 1B). In addition, the upper and lower horizontal members 7A and the reinforcing member 10 are connected and fastened to each other by the plurality of horizontal fastening members 8A, and the soft heat insulating material 21 is sandwiched by the first and second hard heat insulating materials 20A and 20B. doing.

  The square tubular heat-resistant wall 2 having the above-described structure has a simple structure, but the first and second hard heat insulating materials 20A and 20B, the corner material 6A, the corner material 9, the reinforcing material 10, and a plurality of horizontal fastening members. High rigidity is obtained by the cooperation of 8A, and a high heat insulating effect is obtained by the soft heat insulating material 21. Therefore, an increase in radiant heat loss and a reduction in exhaust gas suction capacity are suppressed, and it is permitted to set the thickness t of the first and second hard heat insulating materials 20A and 20B to be thin, and the Since it is possible to prevent destruction or steam explosion, it is possible to prevent destruction or steam explosion of each of the square cylindrical chimney units 1A, 1B, 1C and the chimney 1, and further described with reference to FIGS. The same operations and effects as the square tubular heat-resistant wall 2 of the first and second embodiments are exhibited. In addition, the chimney 1 constructed by laminating a plurality of rectangular tube chimney units 1A, 1B, 1C of the rectangular tube-shaped heat resistant wall 2 according to the third embodiment above and below has a side length of 500 mm or more. Suitable for construction of large-diameter chimneys.

  In the square tubular heat-resistant wall 2 applied to the construction of a large-diameter chimney, when the horizontal length of each side exceeds 1000 mm, one wide calcium silicate plate 20a to 20d corresponding to the length. , 20a 'to 20d', each side constitutes excessive bending due to thermal expansion and contraction, and the shape of the square tubular heat-resistant wall 2 is damaged. Therefore, the calcium silicate having a width dimension within 1000 mm It is desirable to make the length of each side in the horizontal direction over 1000 mm by making up by adding the plates 20a to 20d and 20a 'to 20d'.

  In each of the above-described embodiments, the rectangular cylindrical heat-resistant wall 2 whose projection plane shape has a rectangular closed cross section has been described. However, the square cylindrical heat-resistant wall 2 is configured by various square projection plane shapes such as a square, a triangle, and a trapezoid. Also good.

  The chimney 1 according to the present invention is not limited to the above-described embodiment, and can be structurally modified without departing from the spirit and technical idea thereof.

  The chimney of the present invention is useful as a chimney that diffuses the exhaust gas of a gas turbine engine or a diesel engine that drives an emergency generator, the exhaust gas of a boiler, the exhaust gas of an industrial waste incinerator or the like to the outside.

DESCRIPTION OF SYMBOLS 1 Chimney 1A Chimney unit 1B Chimney unit 1C Chimney unit 2 Square cylindrical heat-resistant wall 20 Hard heat insulating material 20A 1st hard heat insulating material 20B 2nd hard heat insulating material 20a-20b Calcium silicate board 20a'-20b 'Calcium silicate board 21 Soft heat insulating material 22 Galvanized steel plate, stainless steel plate (steel plate)

Claims (5)

In the chimney constructed by laminating a plurality of square cylindrical chimney units having a square cylindrical heat resistant wall having a square closed cross-sectional projection plane,
The square cylindrical heat-resistant wall is configured by a composite structure in which a hard heat insulating material and a soft heat insulating material are arranged adjacent to each other in the thickness direction. The chimney according to claim 1, wherein the hard heat insulating material is a calcium silicate plate, and the soft heat insulating material is a fibrous heat insulating material. The chimney according to claim 1 or 2, wherein the square tubular heat-resistant wall includes the soft heat insulating material, the hard heat insulating material arranged adjacent to each other in one thickness direction of the soft heat insulating material, and the soft heat insulating material. A chimney composed of a composite structure with steel plates arranged adjacent to each other on the remaining surface in the thickness direction. The chimney according to claim 1 or 2, wherein the square tubular heat-resistant wall is a composite structure of the soft heat insulating material and a pair of hard heat insulating materials arranged adjacent to each other on both sides in the thickness direction of the soft heat insulating material. A chimney that is made up of. The chimney according to any one of claims 1 to 4, wherein the thickness of the hard heat insulating material is set in a range of 30 mm to 50 mm, preferably 35 mm.

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