JPH10185175A - Shut-off damper for high temperature fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate leakage of a high temperature fluid by improving sealability when shutting off the high temperature fluid. SOLUTION: This shielding damper for a high temperature fluid has a passage of a high temperature fluid and is provided in the passage with a plurality of blade bodies 21 in which adjacent rotary end rim parts 18a individually rotating centering around a plurality of axes as set parallel with each other to traverse the flow of the high temperature fluid separate from or contact each other to pass or interrupt the high temperature fluid and a small blade 19 which is each protrusively arranged along the rotary end rim parts 18a and side part rim parts of the blade bodies 21 and closely contacts the adjacent blade bodies 21 when the rotary end rim parts 18a of the adjacent blade bodies 21 contact each other. In this case, a slit 22 is cut into each of the rotary end rim parts 18a of the blade bodies 21 and a reinforced material 23 is mounted along the rotary end rim part 18a where the slit 22 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature fluid shut-off damper for flowing or interrupting the flow of a high-temperature fluid.

[0002]

2. Description of the Related Art FIG. 3 is a system diagram showing an example of a high-temperature fluid flow path provided with a high-temperature fluid shut-off damper. The gas turbine 1 drives a generator 2 and the gas turbine 1 The discharge passage 3 connected to the combustion gas discharge port of the exhaust gas boiler 5 through the high-temperature fluid shut-off damper 4
It is connected to the entrance side.

[0003] The outlet side of the exhaust gas boiler 5 is directly connected to the inlet side of the intermediate temperature denitration device 6, and the outlet side of the intermediate temperature denitration device 6 is connected to a chimney 9 via a damper 7 and a discharge channel 8. I have.

In the middle of the discharge channel 3, another discharge channel 10
The discharge flow path 10 is connected to the inlet side of the high-temperature denitration device 12 via the high-temperature fluid shut-off damper 11. The outlet side of the high-temperature denitration device 12 is connected to the discharge channel 8 via the high-temperature fluid shut-off damper 13, and is connected to the chimney 9.

Next, the operation of the apparatus shown in FIG. 3 will be described.

During normal boiler operation, the high-temperature fluid shut-off dampers 4 and 7 are opened, and the high-temperature fluid shut-off dampers 11 and 11 are opened.
13 is kept closed.

When the gas turbine 1 is operated in this state,
The generator 2 generates power and the gas turbine 1
The high-temperature combustion gas of about 550 ° C discharged from the exhaust gas enters the exhaust gas boiler 5 through the discharge passage 3 and the high-temperature fluid shut-off damper 4, and heat recovery such as heating water to generate steam is performed. .

The exhaust gas recovered by heat in the exhaust gas boiler 5 has a temperature of about 200 ° C.
After being denitrated by the denitration catalyst for medium temperature, it is discharged from the chimney 9 through the damper 7 and the discharge channel 8 to the outside.

There is no need for steam from the exhaust gas boiler 5,
Moreover, when the power from the generator 2 is required, the high-temperature fluid cut-off dampers 4 and 7 are closed, and the high-temperature fluid cut-off dampers 11 and 13 are opened.

When the gas turbine 1 is operated in this state,
The high-temperature combustion gas of about 550 ° C. discharged from the gas turbine 1 flows from the discharge flow path 3 to the discharge flow path 10, passes through the high-temperature fluid cut-off damper 11, enters the high-temperature denitration device 12, and is heated by the high-temperature denitration catalyst. After being denitrated, it is discharged from the chimney 9 to the outside through the high-temperature fluid cut-off damper 13 and the discharge passage 8.

Conventional high-temperature fluid shut-off dampers 4, 11, 1
3, as shown in FIGS. 4 and 5, a plurality of shafts 15 parallel to each other are rotatably provided in a duct 14 serving as a flow path of the high-temperature fluid so as to cross the flow of the high-temperature fluid, A stainless steel rectangular blade body 18 having a reinforcing boss 16 and a rib 17 is fixed to the shaft 15.

When the shafts 15 are simultaneously rotated in the counterclockwise direction in FIG. 5, each blade body 18 rotates counterclockwise about the shaft 15 together with the shaft 15 and the shaft 15 of the blade body 18 is rotated.
Are separated from the rotating edge portions 18 a of the adjacent blade bodies 18, and pass the high-temperature fluid that is going to flow in the duct 14 between the plurality of blade bodies 18. Make it available for distribution.

When the shafts 15 are simultaneously rotated clockwise in FIG. 5 while the high-temperature fluid is flowing, each blade body 18 rotates clockwise about the shaft 15 together with the shaft 15. The rotating edge 18a of the blade body 18 comes into contact with the rotating edge 18a of the adjacent blade body 18 as shown in FIGS. Will be cut off.

In order to enhance the sealing performance of the blade body 18 in the shut-off state, small blades 19 made of a nickel alloy thin plate are provided on the rotating edge 18a and the side edge 18b of the blade body 18. Is protruding. In addition, the tips of the small blades 19 attached to the left and right side edges 18b in FIG. 4 are always in close contact with the vertical inner side surface 14a of the duct 14 and protrude from the rotating edge 18a of the blade body 18. Small feather 19
When the blade body 18 is in a state of blocking the high-temperature fluid, the blade body 18 is in close contact with the rotating edge 18a of the adjacent blade body 18 to reliably block the high-temperature fluid. Reference numeral 20 denotes a fixing bolt for fixing the small blade 19 to the blade main body 18.

[0015]

In the case of a high-temperature fluid blocking damper in which the duct 14 is large and the rotating edge 18a of the blade body 18 is long, the blade body 18 is made of a high-temperature fluid. The thermal distortion of the rotating edge 18a parallel to the shaft 15 is increased, and the rotating edge 18a is curved or deformed in a wave shape. In the conventional blade body 18, the rotating edge 18a parallel to the shaft 15 and the small blade 19 There is a problem in that a gap is formed between the high-temperature fluid and the sealing performance when the high-temperature fluid is cut off, and the high-temperature fluid leaks.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-temperature fluid shut-off damper which solves such a problem and improves the sealing performance when shutting off a high-temperature fluid so that the high-temperature fluid does not leak. Things.

[0017]

According to the first aspect of the present invention, each of the rotary members is rotated about a plurality of axes installed in parallel in the flow path of the high-temperature fluid so as to cross the flow of the high-temperature fluid. A plurality of blade bodies for flowing or blocking the high-temperature fluid by separating or abutting adjacent rotating edge portions, and protruding along the rotating edge portions and side edge portions of the blade body. And a small blade closely contacting the adjacent blade body when the rotating edges of the adjacent blade bodies abut against each other, wherein a slit is cut in the rotating edge of the blade body. And a high-temperature fluid shut-off damper, wherein a reinforcing member is attached along a rotating edge portion where the slit is formed.

According to a second aspect of the present invention, a plurality of mounting bolt insertion holes are formed along the vicinity of the rotating edge of the blade body.
2. The high-temperature fluid cut-off damper according to claim 1, wherein a reinforcing member is attached to the blade main body so as to sandwich the rotating end portion by a mounting bolt having a smaller diameter than the bolt insertion hole.

According to the first aspect of the present invention, since the slit is formed at the rotating edge of the blade body and the reinforcing member covering the slit is attached, the blade body is curved by thermal distortion due to the high temperature fluid. Since the rotating edge is held in a straight line by the reinforcing material even if it tries to deform into a wavy shape, no gap is formed between the rotating edge of the blade body and the small blade.

According to the second aspect of the present invention, even if the blade main body expands two-dimensionally due to heat, it is possible to prevent an unreasonable force from acting on the mounting bolts fixing the reinforcing member and the reinforcing member.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the embodiment of the present invention in FIG.
FIG. 2 is a cross-sectional view partially cut away as viewed from II of FIG.
Is a partial front view of FIG. 1 as viewed from the II direction,
Although not shown above the blade main body 21, FIGS.
A rotatable shaft 15 is fixed similarly to the shaft 15.

A slit 22 for preventing thermal distortion of a required length in a direction perpendicular to the shaft 15 at appropriate intervals is cut in the rotating edge 18a of the blade body 21 parallel to the shaft 15. Then, as in the prior art,
In order to enhance the sealing performance of the blade main body 21 in the cutoff state, small blades 19 made of a thin plate of a nickel alloy are provided so as to be connected so as to continuously cover the slits 22.

A channel-shaped reinforcing member 23 sandwiching the blade main body 21 from both sides following the base end 19 ′ of the small blade 19 and covering the base end of the slit 22 is provided on the rotating edge 1.
8a, a plurality of mounting bolts 24 are used to
Attached to. The small blade 19 may have a wide width so that the base end 19 ′ side covers the slit 22. In this case, the reinforcing member 23 is mounted on the small blade 19. .

The bolt insertion hole 25 formed at a place where the mounting bolt 24 penetrates the blade main body 21 or the small blade 19 is a large-diameter hole.
The diameter of the bolt 4 is smaller than the diameter of the bolt insertion hole 25, and a gap is formed between the inner peripheral surface of the bolt insertion hole 25 and the outer peripheral surface of the mounting bolt 24.

Next, the operation of the apparatus shown in FIGS. 1 and 2 will be described.

When thermal distortion is generated in the rotating edge 18a parallel to the shaft 15 of the blade body 21 under the influence of the heat of the high-temperature fluid, the slit 22 absorbs the deformation of the blade body 21. And the reinforcing material 23 is
a is held linearly while suppressing the bending or wavy deformation of the blade body 21 when the blade body 21 is closed.
There is no gap between the blade and the small blade 19.

Even if the blade body 21 expands in a plane due to heat, there is a gap between the bolt 24 fixing the reinforcing member 23 and the bolt insertion hole 25 where the bolt 24 penetrates the blade body 21. Since there is a gap, no excessive force acts on the bolt 24 or the reinforcing member due to the thermal expansion of the blade body 21.

[0029]

According to the first aspect of the present invention, the slit absorbs the deformation of the blade body due to heat, and the reinforcing member suppresses the curved or wavy deformation of the edge of the blade body. There is no gap between the edge and the small blade,
This has the effect of improving the sealing performance when blocking high-temperature fluid.

According to the second aspect of the present invention, even if the blade body expands two-dimensionally due to heat, it is possible to prevent an unreasonable force from acting on the mounting bolts for fixing the reinforcing member and the reinforcing member.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention with a part cut away as viewed from II in FIG. 2;

FIG. 2 is a partial front view of FIG. 1 viewed from a direction II.

FIG. 3 is a system diagram showing an example of a high-temperature fluid flow path provided with a high-temperature fluid shut-off damper.

FIG. 4 is a front view showing an example of a conventional high-temperature fluid blocking damper.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Description of Signs] 15 Shaft 18a Rotating end edge 19 Small blade 21 Blade body 22 Slit 23 Reinforcement material 24 Mounting bolt 25 Bolt insertion hole

Claims (2)

[Claims] 1. A high-temperature fluid is rotated around a plurality of axes installed parallel to each other so as to traverse the flow of the high-temperature fluid in a flow path of the high-temperature fluid. The plurality of blade bodies that circulate or block the high-temperature fluid by abutting, and the rotating edge portions of the adjacent blade bodies that are protruded along the rotating edge portions and the side edge portions of the blade body portion are adjacent to each other. In a high-temperature fluid cut-off damper having a small blade closely contacting an adjacent blade body when abutting, a slit is cut into a rotating edge of the blade body, and a slit is formed in the rotating edge where the slit is formed. A high-temperature fluid cut-off damper characterized by attaching a reinforcing material along the same. 2. A plurality of bolt insertion holes are formed along the vicinity of the rotating edge of the blade main body, and a reinforcing member is sandwiched by the mounting bolt having a smaller diameter than the bolt inserting hole. 2. The high-temperature fluid shut-off damper according to claim 1, wherein the damper is attached to the blade body.