JP2004132613A - Chimney - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the manufacturing cost while satisfactorily keeping the appearance by surrounding a metallic exhaust pipe with a facing plate. <P>SOLUTION: This chimney comprises the metallic exhaust pipe B, which is surrounded by the facing plate 1. An air passage E for cooling the exhaust pipe is provided between the exhaust pipe and the facing plate. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chimney in which a metal smoke stack is surrounded by an exterior plate.
[0002]
[Prior art]
Metal smoke stacks have a problem that the strength tends to decrease due to the rise in temperature due to the smoke stack, and there is a problem that the paint is exposed to high temperatures and deteriorates promptly even if the appearance is to be kept good by painting. If it is made of an expensive metal, such as stainless steel, for example, there is a disadvantage that the installation cost is increased so that the external appearance can be maintained well while securing the strength of the device.
For example, the chimney is made of inexpensive metal such as rolled steel for general structures, and while ensuring its strength, the smoke stack is surrounded by an exterior plate so that the appearance can be maintained well. An exterior plate is provided so as to cover the entire outer peripheral surface of the smoke exhaust tube (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-317726 (FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
However, since the exterior plate is provided so as to cover the entire outer peripheral surface of the smoke exhaust tube, the temperature of the smoke exhaust tube is more likely to rise than when no exterior plate is provided, and the strength of the smoke exhaust tube is secured. The disadvantage is that the production costs increase, since more materials have to be used to be able to do so.
Further, if the exterior plate is made of an aluminum alloy plate material so that the maintenance work of the exterior plate can be reduced and the appearance can be favorably maintained for a long period of time, there is a disadvantage that the production cost of the exterior plate is increased.
In particular, an exterior plate made of an aluminum alloy plate material is easily deteriorated by heat from a smoke stack, so it is necessary to provide a heat insulating material between the smoke stack and the exterior plate, which increases the installation cost of the exterior plate. There are drawbacks.
The present invention has been made in view of the above circumstances, and has as its object to reduce the manufacturing cost while enclosing a metal smoke exhaust tube with an exterior plate so as to maintain a good appearance.
[0005]
[Means for Solving the Problems]
A feature of the invention according to claim 1 is a chimney in which a metal smoke stack is surrounded by an exterior plate, and an air flow path for cooling the smoke stack is provided between the smoke stack and the exterior plate. At one point.
[0006]
[Action and effect]
An air flow path for cooling the smoke stack provided between the smoke stack and the outer panel cools the smoke stack and suppresses the temperature rise. Even if the smoke stack is made of materials, the strength of the smoke stack can be ensured, and the rise in the temperature of the exterior board due to the heat from the smoke stack can be suppressed, so that an inexpensive thin exterior board can be used. The production cost can be reduced while surrounding the metal smoke stack with an exterior plate so as to maintain good appearance.
[0007]
A feature of the invention according to claim 2 is that the exterior plate is formed of stainless steel.
[0008]
[Action and effect]
Since the exterior plate is made of stainless steel, the appearance can be maintained well over a long period of time while reducing the labor for maintenance, and the temperature rise of the exterior plate due to heat from the smoke stack can be suppressed, The production cost can be reduced by using an inexpensive thin stainless steel armor plate.
[0009]
The feature configuration of the invention according to claim 3 is that fixing portions for fixing the exterior plate to the smoke stack are provided at a plurality of upper and lower portions of the exterior plate, and among the fixing portions at the plurality of positions, a vertical direction of the exterior plate is provided. Is fixed to a first fixing portion that is fixed to the smoke exhaust tube so as not to be relatively movable vertically, and a portion other than the first fixed portion is fixed to be vertically movable relatively to the smoke exhaust tube. In the second fixing portion.
[0010]
[Action and effect]
A first fixed portion fixes a fixed portion of the exterior plate at a plurality of upper and lower portions fixing the exterior plate to the smoke stack so as to be relatively immovable in the vertical direction with respect to the smoke exhaust tube by the first fixing portion. Since the part other than the fixed part is fixed to the second fixed part so as to be vertically movable relative to the flue gas stack, the temperature difference between the smoke flue and the cladding panel, the coefficient of thermal expansion between the flue gas cylinder and the cladding board, The relative displacement in the vertical direction between the smoke stack and the outer casing due to the difference can be absorbed by the second fixing portion.
Therefore, since thermal stress is hardly generated on both the smoke exhaust tube and the exterior plate, even if the weight of the smoke exhaust tube and the exterior plate is reduced, the required strength can be easily secured, and the production cost can be further reduced.
[0011]
A feature of the invention according to claim 4 is that a fixing frame for fixing the exterior plate along the circumferential direction of the smoke stack and at a distance from the smoke stack is fixed to the smoke stack circumferential direction. Is provided so as to be displaceable along.
[0012]
[Action and effect]
The relative displacement in the circumferential direction of the smoke stack and the outer panel due to the temperature difference between the smoke stack and the outer panel and the difference in the thermal expansion coefficient between the stack and the outer panel, Along with and at an interval from the flue gas cylinder, the fixed frame fixed to the flue gas cylinder can absorb the displacement along the circumferential direction of the flue gas cylinder.
Therefore, since thermal stress is hardly generated on both the smoke exhaust tube and the exterior plate, even if the weight of the smoke exhaust tube and the exterior plate is reduced, the required strength can be easily secured, and the production cost can be further reduced.
[0013]
A feature of the invention according to claim 5 is that the exterior plate is formed in a corrugated shape provided with irregularities along the circumferential direction of the smoke stack.
[0014]
[Action and effect]
Since the exterior panel is formed in a corrugated shape with irregularities along the circumference of the smoke stack, the exterior panel easily expands and contracts along the circumference of the smoke stack, and the temperature difference between the smoke stack and the exterior board, The relative displacement of the smoke stack and the outer panel in the circumferential direction due to the difference in the coefficient of thermal expansion between the smoke stack and the outer panel is absorbed by the expansion and contraction of the outer panel to prevent damage to the fixing points of the outer panel to the stack. it can.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cylindrical smoke exhaust tube B having a diameter of about 6 m (rolled steel for general structural use) surrounded by a large number of metal exterior plates 1 and having a height from the ground of about 60 m according to the present invention. A chimney A is shown, in which high-temperature exhaust gas from a gas turbine (not shown) having a temperature of about 600 ° C. can be discharged into the atmosphere through a smoke stack B while passing through a silencer D.
[0016]
As shown in FIG. 2, the exterior plate 1 is formed of a stainless steel having a thickness of about 0.5 to 0.6 mm, which is bent into a corrugated shape having irregularities along the circumferential direction of the smoke stack B. With the corrugated sheet, each outer panel 1 is attached to the cylindrical shape surrounding the smoke exhaust tube B at an interval of about 200 mm from the outer peripheral surface of the smoke exhaust tube B, and surrounds the smoke exhaust tube B at intervals over the entire circumference. The outer casing C for the exterior is formed.
[0017]
An annular air flow path E for cooling the flue gas cylinder is formed between the flue gas cylinder B and each of the outer panels 1, that is, between the flue gas cylinder B and the outer cylinder C, and the lower end of the outer cylinder C and the flue gas are cooled. The air that has flowed into the air flow path E from the external air inlet F formed in a ring shape with the smoke pipe B rises in the air flow path E while cooling the smoke discharge pipe B, and the upper end of the outer pipe C and the smoke discharge pipe B Are naturally discharged to the outside from an outside air outlet G formed in an annular shape between the two.
[0018]
The fixing structure of the exterior plate 1 will be described.
As shown in the developed view of FIG. 3, the annular frame 2 is fixed along each of the vertical positions of the outer peripheral surface of the smoke stack B at substantially vertical intervals, and the length in the vertical direction is substantially the same. A plurality of exterior panels 1 are arranged vertically and horizontally in a posture that is uneven along the circumferential direction of the flue gas cylinder, and are fixed with a large number of rivets 3 over a plurality of upper and lower frame frames 2.
[0019]
The exterior plate 1 is formed by stacking cylindrical end portions of the exterior plate 1 in the circumferential direction of the smoke exhaust tube to form a cylindrical shape. The positions of the overlapping portions of the outer plates 1 of the tubular body 4 are shifted in the circumferential direction by the upper and lower tubular members 4 so that the two overlap each other and so that the four outer plates 1 do not overlap at one place. It is arranged up, down, left and right.
[0020]
As shown in FIG. 2, the frame 2 has a large number of stainless steel stud bolts (spacer members) 5 fixed to the outer peripheral surface of the smoke stack B at substantially constant intervals by welding. A stainless steel fixing hardware 6 is fastened and fixed to each of them, and the exterior plate 1 is fixed to the smoke exhaust tube B along the circumferential direction of the smoke exhaust tube B and at a distance from the smoke exhaust tube B. Is fixed by welding over the fixing hardware 6 adjacent in the circumferential direction.
[0021]
The fixing hardware 6 is formed by bending a stainless steel band plate material into a U-shape in a side view, and fixing a welding fixing piece 9 to each of the facing pieces 8 to extend outward. The intermediate portion is fastened and fixed to the stud bolt 5 so that the opposing pieces 8 are elastically displaceable in the near and far directions.
[0022]
Then, the fixed frame 7 is fixed by welding over a pair of fixed pieces that are circumferentially opposed to each other in the circumferential direction of the fixed hardware 6 adjacent to each other in the circumferential direction, and each fixed frame is elastically displaced between the opposed pieces 8 in the perspective direction. 7 is provided so as to be elastically displaceable along the circumferential direction of the smoke stack.
The fixing structure between the exterior plate 1 and the fixed frame 7 will be described in detail. As shown in FIGS. 3 and 4, the position at the same interval as the vertical interval of the frame 2 in the direction along the bent portion of the exterior plate 1. A plurality of rivet insertion holes 10 are formed at substantially constant intervals along the line, and a plurality of rivet holes 11 are formed at each fixed frame 7 at substantially the same constant intervals as the rivet insertion holes 10 of the exterior plate 1. Fixing portions 12 and 13 for fixing the exterior plate 1 to the flue gas discharge tube B with the rivets 3 inserted through the rivet insertion holes 10 of the plate 1 and the rivet holes 11 of the fixing frame 7 are provided along a plurality of upper and lower portions of the exterior plate 1. It is provided in the flue gas cylinder circumferential direction.
[0024]
Then, of the fixed portions 12 and 13 at the upper and lower portions, a fixed portion in the vertical direction of the exterior plate 1, that is, in the present embodiment, the fixed portion 12 at an intermediate position in the vertical direction of the exterior plate 1 is moved with respect to the smoke exhaust tube B. And a second fixing portion for fixing the fixing portion 13 other than the first fixing portion 12 so as to be relatively movable in the vertical direction with respect to the smoke exhaust tube B. It is formed in the part.
[0025]
As shown in FIG. 5A, the first fixing portion 12 forms rivet holes 10a (10) and 11 having substantially the same diameter in the exterior plate 1 and the fixing frame 7, and the rivet holes 10a and 11 A blind rivet 3 made of stainless steel having substantially the same diameter is inserted through the rivet hole 10a of the exterior plate 1 and the rivet hole 11 of the fixed frame 7, and the blind rivet 3 is swaged from the outer surface of the exterior plate. 1 and the fixed frame 7 are integrally fixed so as to be relatively immovable, and the overlapping portion of the exterior plates 1 adjacent to each other on the left and right in the first fixed portion 12 is also fixed to the blind rivet 3 as shown in FIG. Is inserted through the rivet hole 10a of each outer plate 1 and the rivet hole 11 of the fixed frame 7 and swaged from the outer surface side of the outer plate, whereby each outer plate 1 and the fixed frame 7 cannot be relatively moved. It is fixed integrally.
[0026]
As shown in FIG. 6A, the second fixing portion 13 forms a rivet hole 11 in the fixing frame 7 and a through hole 10b (10) having a larger diameter than the rivet hole 11 in the exterior plate 1. 6 (b), a stainless steel blind rivet 3 having substantially the same diameter as the rivet hole 11 and a stainless steel spacer washer 14 having substantially the same thickness as the outer plate 1 are formed. The blind rivet 3 is inserted through a small-sized washer 15 made of stainless steel having a diameter larger than that of the through-hole 10b, through the through-hole 10b of the exterior plate 1 and the rivet hole 11 of the fixing frame 7, and the blind rivet 3 is inserted into the exterior plate. The outer panel 1 and the fixed frame 7 are fixed to the smoke stack B so as to be relatively movable in the vertical direction and in the circumferential direction of the smoke stack by crimping from the outer surface side.
[0027]
As shown in FIG. 7A, the overlapping portions of the exterior plates 1 adjacent to each other in the upper, lower, left, and right directions in the second fixing portion 13 also include the spacer washers 14 and the oval washers 15 corresponding to the number of the overlapping exterior plates 1. The blind rivet 3 is passed through the through hole 10b of each of the outer plates 1 and the rivet hole 11 of the fixed frame 7 and swaged from the outer surface of the outer plate. Are fixed so as to be able to move relative to the flue gas cylinder B both vertically and circumferentially.
[0028]
[Other embodiments]
1. The chimney according to the present invention may be configured such that the air for cooling the flue gas is forced to flow into the air flow path.
2. The chimney according to the present invention may be configured to forcibly discharge the air for cooling the flue gas in the air flow path.
3. In the chimney according to the present invention, a plurality of air flow paths may be separately provided in the longitudinal direction of the smoke stack, and each air flow path may be provided with an outside air inlet and an outside air outlet.
4. In the chimney according to the present invention, a plurality of air flow paths may be separately provided in the circumferential direction of the smoke stack, and each air flow path may be provided with an outside air inlet and an outside air outlet.
5. In the chimney according to the present invention, the exterior plate may be formed of mild steel such as rolled steel for general structure.
6. The chimney according to the present invention may discharge steam or exhaust gas mixed with steam in addition to the combustion exhaust gas.
7. In the chimney according to the present invention, the fixing frame for fixing the outer panel along the circumferential direction of the smoke stack and at a distance from the smoke stack is fixed to the smoke stack with a shaped steel such as an angle material or a channel material. May be.
8. The chimney according to the present invention may be a multi-cylinder chimney in which a plurality of chimney stacks are collectively supported and surrounded by an outer panel.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of a chimney. FIG. 2 is a partial cross-sectional plan view showing a fixing structure of an outer plate. FIG. 3 is a partially omitted development view showing a fixing structure of an outer plate. FIG. FIG. 5 is a sectional view of a main part showing a first fixing part. FIG. 6 shows a second fixing part, (a) is a side view, and (b) is a sectional view. FIG. 7 is a second fixing part. (A) is a side view, (b) is a cross-sectional view [Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Exterior plate 7 Fixed frame 12 First fixed part 13 Second fixed part B Smoke stack E Air flow path

Claims (5)

A chimney that surrounds a metal smoke stack with an outer panel,
A chimney having an air flow passage for cooling the flue gas between the flue gas tube and the outer panel. 2. The chimney according to claim 1, wherein the exterior plate is formed of stainless steel. A fixing portion for fixing the exterior plate to the smoke stack is provided at a plurality of upper and lower locations of the exterior plate, and among the fixed portions of the plurality of locations, a fixed portion in the vertical direction of the exterior plate is vertically moved with respect to the smoke stack. The first fixing portion is fixed to the first fixing portion so as to be relatively immovable in a direction, and a portion other than the first fixing portion is formed to a second fixing portion fixed to be relatively movable in the up-down direction with respect to the smoke exhaust tube. Item 6. The chimney according to Item 1 or 2. A fixing frame for fixing the exterior plate along the circumferential direction of the smoke stack and at a distance from the smoke stack, and is provided so as to be displaceable along the circumferential direction of the smoke stack. The chimney according to any one of claims 1 to 3. The chimney according to any one of claims 1 to 4, wherein the exterior plate is formed in a corrugated shape provided with irregularities along a circumferential direction of the smoke stack.

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