JP2002005425A - Smoke discharging device and assembling method of flow regulating plate for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smoke discharging device, not inducing the vibration of a smoke discharging passage on the downstream side of a curved part and capable of preventing a pressure loss in the curved part. SOLUTION: The end part of a duct (D1) is connected to a smoke discharging tube (E1), extended uprightly, from the horizontal direction so as to form a T-shape while a first flow regulating plate (S1) and a second flow regulating plate (S2) are arranged in the connecting part. The first flow regulating plate is extended into not only the connecting part but also the upstream side of the duct and the downstream side of the smoke discharging tube. The second flow regulating plate is served both for the role of a hopper. Waste gas, passed through the duct, is guided smoothly into the smoke discharging tube by the first and second flow regulating plates, then, the gas is passed through the smoke discharging tube without meandering whereby the vibration of the smoke discharging tube can be restrained. Further, a pressure loss can be reduced. The first and second flow regulating plates can be carried into the duct by dismantling them whereby they can be applied for the improvement of an already existing device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoke exhaust device, and more particularly to a smoke exhaust device having a bent smoke exhaust passage.

[0002]

2. Description of the Related Art As shown in FIG. 12, for example, as shown in FIG. 12, a smoke exhaust device used in thermal power generation or the like has a duct D extending horizontally from a power generation boiler B as an exhaust gas source and extending vertically upward. The exhaust gas is discharged from the boiler B to the duct D at about 27 m / s, for example, and is designed to be discharged to the atmosphere at about 30 m / s from the smoke stack E. The exhaust gas flows through the duct D and the smoke stack at a considerably high speed.

[0003] The smoke exhaust tube E is erected on a foundation 50, and is mounted on a support structure 5 provided at an outer cylinder structure 51 at a plurality of heights.
2, the smoke stack E for thermal power generation using a clean fuel such as liquefied natural gas (LNG) is constructed using clad steel in which SUS is thinly laminated on a structural steel sheet. Exhaust stack E in contact with the support beam 52
A reinforcement ring 53 is provided on the outer peripheral surface of the smoke exhaust tube 53, and the smoke exhaust tube 53 itself has a relatively flexible structure. Therefore, this type of smoke stack is hereinafter referred to as a flexible smoke stack.

[0004]

With the above construction, the exhaust gas passing through the duct D flows into the smoke exhaust tube E via the connection portion with the smoke exhaust tube E, but flows at a high speed and is rapidly bent upward. Because of this, it collides strongly with the inner surface of the smoke stack E,
After colliding with the inner surface of the smoke stack E, it is raised and released in a meandering manner. Due to the meandering of the exhaust gas flow, vibrations are steadily generated in the flue gas tube E having the flexible structure, and due to the metal fatigue caused by the continuous vibration, the joint portion of the reinforcing ring 53 in contact with the support beam 52 of the flue gas tube E, etc. Cracks are formed on the surface, which causes a problem that they grow.

[0005] Conventionally, after a crack occurrence portion detected in a periodic inspection is repaired, the vibration damper 5 is moved to this position.
5 to prevent reoccurrence, but over time, similar cracks may occur in other locations, and repair work and vibration dampers 5
5 must be repeated, and an improvement is desired. Further, there is a problem that a predetermined operating efficiency cannot be achieved due to a pressure loss of exhaust gas generated at the connection portion.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a smoke exhaust device which does not induce vibration of a smoke exhaust passage downstream of a bent portion through which exhaust gas flows and which prevents pressure loss at the bent portion. I do.

[0007]

According to the first aspect of the present invention, there is provided a smoke exhaust device which bends exhaust gas in an exhaust passage and discharges the exhaust gas. A provided smoke exhaust device is provided. In the smoke exhaust device configured as described above, the exhaust gas is smoothly bent by the rectifying plate, the vibration of the exhaust path downstream of the bent portion is suppressed, and the pressure loss is also suppressed.

According to a second aspect of the present invention, in the first aspect of the present invention, the current plate is formed by combining a plurality of frame members that can be carried into the flue gas passage through the carrying hole provided in the flue gas exhaust device. Provided is a smoke exhaust device including a skeleton structure and a surface member that covers the skeleton structure by combining a plurality of divided surface members that can be carried into a smoke exhaust passage via a carry-in hole provided in the smoke exhaust device. Is done. In the smoke exhaust device configured as described above,
The flow straightening plate is constructed by combining a plurality of framing members that can be carried into the flue gas passage through the carry-in hole provided in the smoke exhaust device, and into the flue gas passage through the carry-in hole provided in the smoke exhaust device. And a surface member covering the skeleton structure by combining a plurality of transportable divided surface members, and can be assembled in a flue gas passage. According to the third aspect of the present invention, in the first or second aspect of the present invention, the exhaust path is connected to a smoke exhaust tube extending substantially vertically upward from the foundation through a bent portion through a duct extending in a substantially horizontal direction. A smoke exhaust device comprising:

According to the fourth aspect of the present invention, a rectifying plate for assembling, in the exhaust passage, a rectifying plate for smoothly bending the exhaust gas of the smoke exhaust device along the exhaust passage by bending the exhaust gas in the exhaust passage. A method comprising: loading a plurality of skeleton members and a plurality of divided surface members into an exhaust passage from a carry-in hole provided in a smoke exhaust device; and combining the skeleton members to form a skeleton structure at a bent portion in the exhaust passage. A method for assembling a current plate is provided, comprising the steps of configuring, combining a divided surface member to form a surface member, and covering the skeleton structure with the surface member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention applied to a smoke exhaust device in which a duct extending in a horizontal direction is connected to a flexible smoke exhaust tube extending vertically upward will be described below. First, the concept will be explained. The vibration generated in the conventional flue gas stack with flexible structure is caused by the collision of the high-speed exhaust gas flow sent from the duct to the smoke exhaust tube with the inner wall of the smoke exhaust tube, and the high-speed part in the rising exhaust gas flow after the collision. It is thought to be due to uneven pressure in the horizontal direction at an unspecified height that occurs on the low-speed part side (that is, the occurrence of a low-pressure part and a high-pressure part). The exhaust gas flow is rectified to prevent the flue gas cylinder from vibrating.

First, the overall structure of a smoke stack system to which the present invention is applied will be described. FIG. 1 is a top view of the entire structure of a smoke stack system to which the present invention is applied, and FIG. 2 is a side view of a base. B1, B2, B3, and B4 are four power generation boilers, each of which is provided with ducts D1, D2, D3, and D4 through which flue gas flows in a horizontal direction, and smoke stacks E1 and E4.
2, E3 and E4. The ducts D2 and D1 pass through openings on one side (the left side in FIG. 1) of the supporting outer cylinder 10, and are respectively changed in height upward and downward to change the height of the smoke exhaust pipes E2 and E1.
And the ducts D3 and D4 are connected to the supporting outer cylinder 10 respectively.
Through the opening on the other side (the right side in FIG. 1), and are connected to the smoke stacks E3 and E4, respectively, with the height being changed upward and downward and vertically. The smoke exhaust tubes E1, E2, E3, and E4 are clad steel smoke exhaust tubes, and are erected on the foundation 50 and provided at a plurality of height positions inside the support outer cylinder 11, as shown in FIG. This is a so-called flexible smoke exhaust tube that is supported from the side by the support beam 12.

A rectifying plate is provided inside a connection portion between the ducts D1, D2, D3, D4 and the smoke exhaust tubes E1, E2, E3, E4. Hereinafter, the current plate in each embodiment will be described. The current plate of the first embodiment is arranged at a connection portion between the lower ducts D1, D4 and the smoke exhaust tubes E1, E4, but a connection portion between the duct D1 and the smoke exhaust tube E1, the duct D4, and the smoke exhaust tube. Since the connection of E4 is symmetrical with respect to the plane indicated by line A in FIGS.
The rectifier plate provided at the connection between the smoke exhaust tube E1 and the smoke exhaust tube E1 will be described, and the description of the rectifier plate provided at the connection portion between the duct D4 and the smoke exhaust tube E4 will be omitted.

FIG. 3 shows the current plate in the first embodiment in plan view, and FIG. 4 shows the current plate in side view. The downstream end of the duct D1 is curved in a plan view as shown in FIG. 3, and is connected to the smoke exhaust tube E in a T-shape as shown in FIG. A first rectifying plate S is disposed inside a connection portion between the duct D1 and the smoke stack E1 so as to vertically raise exhaust gas that has passed above the cross section of the exhaust passage.
1 and a second rectifying plate S2 arranged so that the exhaust gas that has passed below the exhaust passage section rises vertically upward. The first straightening vane S1 is shown with hatching falling to the left, and not only in the connection portion but also in the duct D1 on the upstream side,
In addition, it extends into the smoke stack E1 on the downstream side. The second straightening plate S2 is shown with hatching to the right and also serves as a hopper, and has a drain hole (not shown).

The layout position, size, shape, etc. of the flow straightening plates S1 and S2 are determined by a flow experiment using a model of a connection portion between the duct D1 and the smoke exhaust tube E1. It is optimally determined to flow smoothly. Therefore, the exhaust gas is guided to the flow straightening plates S1 and S2 at the connection portion (including the region before and after the duct) of the duct D1 and the flue gas tube E1, and
The gas smoothly flows into the smoke exhaust tube E1 without colliding with the inner surface of the smoke smoke tube E1, and rises with a uniform horizontal velocity distribution without meandering inside the smoke smoke tube E1, and the smoke exhaust gas E due to the high-speed exhaust gas flow.
1, and the pressure loss is reduced.

The first rectifying plate S1 and the second rectifying plate S2 are
Each of these components is not integrally formed, but can be formed by assembling a plurality of smallly divided components. Therefore, the above-mentioned plurality of components can be carried inside through a carrying hole (not shown) provided at an appropriate position of the duct D1 or the smoke exhaust tube E1, and can be assembled inside. Thus, in the case of an existing smoke removing device, Can also be applied.

Hereinafter, the structure and assembling procedure will be described with reference to FIGS. 5, 6, 7, and 8, taking the first current plate S1 as an example. The first current plate S1 is mainly composed of a frame assembly 20 of a bolt assembly type, and a face plate 21 which is attached to both sides of the frame 20 by bolts.

The frame 20 is composed of an I-shaped cross member 22 provided in the width direction at intervals, and a cross member 23 in the flow direction connected between the respective through members 22 in a lattice pattern. Assembled in such a procedure. First, with respect to the through member 22, the elements of the through member 22 divided into appropriate lengths are carried into the inside through a carrying hole (not shown) provided in the duct D1 or the smoke exhaust tube E1, and are divided and carried. Threading material 2
Although not shown, the two elements are internally butted with a butt bolt via a splice plate to have a desired length (substantially equal to the inner diameter of the duct D1 or the smoke stack E1). On the other hand, the gusset 24 is attached to the duct D1 or the wall surface of the smoke stack E1. Then, both ends of the through member 22 having a desired length are attached to the gusset 24 provided on the wall of the duct D1 or the smoke exhaust tube E1 by bolts 25 as shown in FIG. Then, a gusset 28 for attaching the bridging member 23 to the through member 22 is attached by welding or bolting. However, the gusset 28 may be attached to the threading member 22 before carrying in as long as the gusset 28 can be carried through the carrying hole. Further, the first current plate S1
First rectifying plate S1 to suppress the turbulence of exhaust gas before and after
As shown in FIG. 7, a steel bar 26 having a circular cross section is welded to the through members 22 at the front end and the rear end. On the other hand, the cross member 23 has a predetermined length L
First, the flange member 27 cut into a predetermined length is carried into the inside from the carry-in hole in the same manner as the through member, and attached to the through member 22 side as shown in FIGS. 7 and 8. On both sides of the gusset 28, bolts 25
Installed by combining.

The face plate 21 is manufactured by being divided into rectangular and deformed rectangular unit face plates (divided surface members) separated by a through member 22, a cross member 23, and a duct D1 or a smoke exhaust tube E1, and is carried inside through a carry-in hole. You. As shown in FIGS. 7 and 8, each unit face plate is connected and fixed to a fixing nut (not shown) on the back side through a bolt hole formed in advance through member 22 and each flange member 27 with a bolt 25. . As described above, the first current plate S1 is assembled inside. Therefore, the present invention can be applied to an existing smoke exhaust device. On the other hand, if it is made of one sheet, it cannot be carried into the inside through the carry-in hole and cannot be applied to the existing smoke exhaust device. The second rectifying plate S2 is similarly assembled inside.

Next, a current plate in the second embodiment will be described. The current plate in the second embodiment is disposed at the connection between the upper ducts D2, D3 and the smoke exhaust tubes E2, E3. However, the connection between the duct D2 and the smoke exhaust tube E2, the duct D3, and the exhaust Since the connecting portion of the smoke tube E3 is symmetrical with respect to the plane indicated by the line A in FIGS. 1 and 2, the rectifying plate disposed at the connecting portion of the duct D2 and the smoke exhaust tube E2 will be described below. Description of the rectifying plate provided at the connection portion of E3 is omitted.

FIG. 9 is a plan view showing the current plate in the second embodiment, and FIG. 10 is a developed side view taken along the line XX in FIG. 9, and FIG. And (B) are cross-sectional views taken along line XIA-XIA and line XIB-XIB in FIG. 10, respectively. The duct D2 bends twice vertically in a substantially crank shape at a position close to the junction with the smoke exhaust tube E2, rises to a position higher than the duct D1, then bends twice horizontally to form a connection with the smoke exhaust tube E2. Connected.

The connection portion is provided with a third rectifying plate S3 and a fourth rectifying plate S4. The third rectifying plate S3 and the fourth rectifying plate S4 are indicated by hatching to the left. It is provided in each of the portions bent twice in the horizontal direction, and is located in a vertical plane along the discharge path at a position closer to the center of the bend than the center of the duct.

The specifications of the third rectifying plate S3 and the fourth rectifying plate S4 are also optimally determined on the basis of fluid experiments and the like as in the first embodiment. It can be carried in and assembled internally. Second
The third rectifying plate S3 and the fourth rectifying plate S4 of the embodiment
In the same manner as in the first embodiment, the exhaust gas is smoothly guided to the smoke exhaust tube E2 along the exhaust path, the meandering of the exhaust gas in the smoke exhaust tube E2 is suppressed, the vibration of the smoke exhaust tube E2 is suppressed, and the pressure loss is also reduced. Can be.

The above description has been made with reference to an example of a smoke exhaust device in which a duct extending horizontally and a smoke exhaust tube extending vertically above are connected in a T-shape. However, the present invention bends various other types of exhaust gas. The present invention can also be applied to a smoke exhaust device that discharges by letting it out, for example, a device that has a portion that bends in a horizontal plane.

[0024]

According to the first aspect of the present invention, there is provided a smoke exhaust device that bends exhaust gas in a discharge path and discharges the exhaust gas, wherein the exhaust gas is provided with a rectifying plate that bends the exhaust gas smoothly along the discharge path. The device is provided, and the exhaust gas is smoothly bent by the rectifying plate, the vibration of the exhaust passage downstream of the bent portion is suppressed, the metal fatigue of the exhaust passage due to the vibration does not occur, the repair cost is reduced, and the pressure is reduced. Since the loss is also suppressed, efficient smoke exhaust can be performed. According to the second aspect of the present invention, in the first aspect of the present invention, the rectifying plate has a skeleton structure formed by combining a plurality of framing members that can be carried into the flue gas passage through the carrying hole provided in the flue gas device. A surface member that covers the skeleton structure by combining a plurality of divided surface members that can be carried into the smoke exhaust passage through a carry-in hole provided in the smoke exhaust device. It can be assembled in a flue and can be applied to existing smoke exhaust systems. According to the invention of claim 3, claim 1
According to the second aspect of the present invention, there is provided a smoke exhaust device in which a duct that extends in a substantially horizontal direction is connected to a smoke exhaust tube that extends substantially vertically upward from a foundation via a bent portion. The exhaust gas flowing in the duct can flow smoothly into the flue gas cylinder extending in the vertical direction, and the vibration of the flue gas cylinder can be suppressed. The great advantage is that dangerous repair work on the vertically extending smoke stack is reduced.
According to the fourth aspect of the present invention, there is provided an assembling method of a rectifying plate in which a rectifying plate for assembling, in an exhaust passage, an exhaust gas of a smoke exhaust device that bends and exhausts the exhaust gas smoothly along the exhaust passage. Loading the plurality of skeleton members and the plurality of divided surface members into the exhaust passage from the carry-in holes provided in the smoke exhaust device, and configuring the skeleton structure at the bent portion in the exhaust passage by combining the skeleton members. And a step of combining the divided surface members to form a surface member, and a step of covering the skeleton structure with the surface member. A rectifying plate can be provided for the rectifier.

[Brief description of the drawings]

FIG. 1 is an overall plan view of a smoke exhaust device according to an embodiment of the present invention.

FIG. 2 is a side view taken along the line II-II in FIG.

FIG. 3 is a plan view illustrating a current plate according to the first embodiment.

FIG. 4 is a side view taken along the line IV-IV in FIG. 3;

FIG. 5 is a development view showing the structure of the rectifying plate as viewed along the line VV in FIG. 4;

6 is a side view taken along the line VI-VI in FIG. 5;

FIG. 7 is a side view taken along the line VII-VII of FIG. 5;

8 is a view taken in the direction of arrows VIII-VIII in FIG. 7;

FIG. 9 is a plan view illustrating a current plate according to a second embodiment.

FIG. 10 is a side view taken along the line XX in FIG. 9;

11A is a sectional view taken along the line XIA-XIA in FIG. FIG. 11B is a sectional view taken along line XIB-XIB in FIG. 10.

FIG. 12 is a view showing a conventional smoke exhaust device.

[Explanation of symbols]

 B, B1, B2, B3, B4: Boiler D, D1, D2, D3, D4: Ducts E, E1, E2, E3, E4: Smoke stack S1: First rectifying plate S2: Second rectifying plate S3: Third Rectifier plate S4: Fourth rectifier plate 11, 51: Support outer cylinder 12, 52: Support beam 53: Reinforcement ring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruyuki Kanayama 4--22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima F-term in Mitsubishi Heavy Industries, Ltd. Hiroshima Works 3K061 VA05 VA13

Claims (4)

[Claims] 1. A smoke exhaust device for bending an exhaust gas in a discharge path to discharge the exhaust gas, wherein a rectifying plate for smoothly bending the exhaust gas along the discharge path is provided. 2. A rectifying plate comprising: a frame structure formed by combining a plurality of frame members which can be carried into a flue gas passage through a carry-in hole provided in a smoke exhaust device; and a carry-in hole provided in a smoke exhaust device. 2. The smoke exhaust device according to claim 1, further comprising: a surface member that covers the skeleton structure by combining a plurality of divided surface members that can be carried into the smoke exhaust passage. 3. 3. The exhaust path as claimed in claim 1, wherein the duct extending in a substantially horizontal direction is connected to a smoke stack extending substantially vertically upward from a foundation through a bent portion. The smoke exhaust device according to claim 2. 4. A method of assembling a rectifier plate in a discharge passage, wherein a rectifier plate for smoothly bending the exhaust gas of a smoke discharge device along the discharge passage is provided in the discharge passage. Loading a plurality of skeleton members and a plurality of divided surface members into a discharge path from a loading hole provided in the apparatus; combining the skeleton members to form a skeleton structure in a bent portion in the discharge path; A method for assembling a flow straightening plate of a smoke exhaust device, comprising: a step of forming a surface member by combining members; and a step of covering a skeleton structure with the surface member.