JPH07280463A - Vapor damper - Google Patents

Abstract

PURPOSE:To improve safety and reliability of a plant by forming a baffle by combining a first material welded to a support member and made of the same material as that of the member and a second material having excellent corrosion resistance against vapor. CONSTITUTION:Baffles 2 made of SUS clad steel are welded to support member 6 and arranged on and underneath a spray tube 1. The member 6 is welded to a condenser to safely support a force to be received by the baffle 2. The baffle 2 is so opposed to the tube 1 that a material having excellent corrosion resistance, i.e., SUS304 (JIS G 4305), SUS316 (JIS G 4305) of austenite SUS is, for example, opposed. A material to be easily welded to the member 6, i.e., a steel material of the same material as that of the member 6 is opposed to a surface of the member 6 to be welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam damper, and more particularly to a steam damper suitable for introducing steam other than steam discharged from a steam turbine into a condenser.

[0002]

2. Description of the Related Art High-temperature and high-pressure steam or drain introduced into a spray pipe is depressurized and sprayed in a spray form,
As a steam damper for colliding this with a baffle to disperse energy, a "steam damper" described in JP-A-4-203792 is known.

This conventional vapor damper will be described with reference to the block diagram of FIG. In the figure, the steam damper 12
The spray pipe 1 having a plurality of steam injection holes 7 at the top and bottom thereof is slidably fixed to the support plate 3 via the adjusting plate 4, and the top and bottom thereof are made of rectangular flat plate-shaped stainless steel. A baffle 2 (buffer plate) is arranged. Also,
A reinforcing material 5 is welded to the outside of the baffle 2. Here, since the reinforcing material 5 is welded to the baffle 2 made of stainless steel, the same stainless steel as the baffle 2 is used. Further, since the baffle 2 and the reinforcing material 5 are welded by different materials, they are attached to the supporting member 6 (steel material) by bolting in order to prevent the decrease in reliability and to absorb the difference in thermal expansion accompanying this.

In the conventional steam damper constructed as described above, the steam 9 introduced into the spray pipe 1 is depressurized and injected by the steam injection holes 7. The injected steam jet 10 collides with the baffle 2 to disperse energy and then diffuse inside the condenser. High temperature and high pressure other than the steam discharged from the steam turbine introduced into the condenser. It prevented the steam or drain from directly hitting the cooling pipe and causing erosion.

[0005]

However, in the conventional steam damper described above, the baffle is welded with the reinforcing material,
Because this was fixed to the support member with bolts,
The workability of the steam damper was reduced. Further, in the structure adopting the bolt tightening, the damage of the steam damper causes the bolts and nuts to flow into the water supply system and damage the equipment such as the water supply pump, thus lowering the safety and reliability of the plant.

Further, the reinforcing member 5 welded to the baffle is
Although it does not directly buffer the high temperature steam, it uses the same material as the baffle, i.e., expensive stainless steel, for welding with the baffle, resulting in high cost.

The present invention has been made in view of the above points, and an object of the present invention is to provide a steam damper that improves workability and economic efficiency, and improves safety and reliability of a plant, and a steam damper. To provide a condenser with a damper.

[0008]

In a condenser for condensing steam discharged from a steam turbine, steam or drain discharged from various devices is introduced in addition to steam discharged from the steam turbine. There is. Since this steam or drain contains steam or drain having a temperature and pressure higher than that of the steam discharged from the steam turbine, it is necessary to prevent direct contact with the cooling pipe of the condenser. Therefore, it disperses the energy of high temperature and high pressure steam or drain, has excellent corrosion resistance to steam, has high workability, and is safe and reliable for other equipment and plants. The emergence of steam dampers is desired.

Therefore, the present inventor has paid attention to a baffle for dispersing the energy of high temperature and high pressure steam or drain. Specifically, on the surface facing the spray pipe where high temperature and high pressure steam or drain directly collides, a material having a material excellent in corrosion resistance against steam, for example, using stainless steel or alloy steel, Also, paying attention to the fact that it is desirable to use a material having a material that can be easily welded to a supporting member that supports the baffle, that is, the same material as the supporting member, on the surface of the baffle that does not collide with high temperature and high pressure steam or drain. , As a baffle material,
It has been found that a composite material having all the above materials should be used. That is, a type of metal clad steel, which is a composite material composed of two different metals, is used. The spray pipe side is provided with a highly corrosion-resistant material and the opposite side is provided with a material that is easy to weld. I knew that I should do it.

According to the present invention, the baffle supported by the support member is welded and fixed to the support member, and the first material made of the same material as the support member and the spray pipe are opposed to each other. And a second material having a higher corrosion resistance to steam than the first material. In addition, as the second material, austenite SUS or ferrite S
US, Steel is preferable as the first material. Also,
It is preferable that the condenser is equipped with a steam damper having the baffle.

The baffle supported by the support member is welded and fixed to the support member and is disposed on a surface to be welded and fixed to the support member, and is made of the same material as the support member. It is a composite of a material and a second material having a higher corrosion resistance to steam than the first material.

[0012]

[Function] The baffle supported by the support member is
A first material which is fixed to the support member by welding and is made of a material similar to that of the support member, and a first material which is disposed on a surface facing the spray pipe and has a corrosion resistance against steam which is superior to that of the first material. When the material of No. 2 is combined and formed, it becomes unnecessary to reinforce the reinforcing member which is conventionally welded to the baffle and the bolt for fixing the reinforcing member to the supporting member, and the baffle can be directly attached to the supporting member. . In addition, since bolt tightening is unnecessary, the bolts and nuts do not flow into the water supply system when the steam damper is damaged, and the equipment such as the water supply pump is not damaged thereby.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those of the conventional technique will be described using the same reference numerals.

FIG. 1 is a structural diagram showing the structure of a steam damper which is an embodiment of the present invention, and FIG. 5 is a structural diagram showing the structure of a condenser.

In the drawings, the condenser is formed by a connecting cylinder 13 connected to a steam turbine, an upper cylinder 14 attached to the lower part of the connecting cylinder 13, and a lower cylinder 17 attached to the lower part of the upper cylinder 14. Inside thereof, a tube nest 15 is provided for circulating cooling water for cooling the steam discharged from the steam turbine. Further, a hot well 18 partitioned by a hot well ceiling plate 19 is formed in the lower part of the condenser. Reference numeral 16 is a water chamber for supplying cooling water to the tube nest 15.

Further, as described above, in the condenser, steam dampers 12 are provided above and below the tube nest 15 so that high temperature and high pressure steam or drain does not come into direct contact with the cooling pipe. Energy of high temperature and high pressure steam or drain introduced therein is dispersed by a baffle provided in the steam damper 12.

As the material of the baffle 2 of this steam damper, as described above, the surface of the spray pipe side on which the high temperature and high pressure steam or drain directly collides has a material excellent in corrosion resistance, that is, as in the conventional case, It is desirable to use stainless steel or alloy steel. Further, it is desirable to use a material having a material that is easily welded to a supporting member that supports the baffle, that is, the same material as the supporting member 6, on the surface of the baffle that does not collide with high temperature and high pressure steam or drain.

Therefore, in this embodiment, as the material for the baffle 2, a composite material having both a material having excellent corrosion resistance and a material having excellent weldability (the same material as the supporting member 6), that is, Metal clad steel, which is a type of material that is a composite of two different metal materials, is used. Specifically, of austenitic SUS, for example, SUS304
(JIS G 4305), SUS316 (JIS G 4
305) and a steel material which is a metal material of the same kind as the supporting member 6 are combined to use SUS clad steel.

Next, the structure of the steam damper of this embodiment using the baffle 2 made of SUS clad steel will be described.

In the steam damper 12, a spray pipe 1 having a plurality of steam injection holes 7 in the upper and lower portions in the center thereof is slidably fixed to a support plate 3 via an adjusting plate 4, and the support plate 3 is the spray pipe 1. Is welded and fixed to the structural member 8 inside the condenser so that all the forces acting on the can be safely supported. Here, the reason why the spray pipe 1 is slidably fixed to the support plate 3 via the adjusting plate 4 is that the spray pipe 1 is caused by thermal expansion due to a rapid temperature rise due to the inflow of high temperature steam. This is because it extends in the direction perpendicular to the pipe axis. Therefore, the spray pipe 1 has a hole larger than the outer diameter of the spray pipe 1, and is slidably fixed to the support plate 3 welded and fixed in the condenser via the adjusting plate 4. As a result, the spray tube 1
Even if thermal expansion occurs due to a rapid temperature rise due to the inflow of high-temperature steam, it can be freely stretched without being restricted and without interfering with others, and excessive stress due to thermal expansion is not applied. Absent.

Above and below the spray pipe 1, the above-mentioned SUS
The baffle 2 made of clad steel is welded to the support member 6 and arranged. The support member 6 is welded to the inside of the condenser so that the force received by the baffle 2 can be safely supported. In order to face the spray tube 1, the baffle 2 is made of a material having excellent corrosion resistance, that is, of austenitic SUS, for example, SUS304 (J
IS G 4305), SUS316 (JIS G 430)
5) Face up. The surface of the support member 6 to be welded is made to face a material that facilitates welding with the support member 6, that is, a steel material that is the same material as the support member 6.

According to the steam damper of this embodiment having such a structure, the introduced steam 9 flows into the spray pipe 1, and the steam injection holes 7 are regularly formed at a certain interval.
It is decompressed and jetted. Then, the jet of steam jet 1
0 is a baffle 2 installed so as to face the flow direction
Collide with and disperse the energy to diffuse inside the condenser.

As described above, in the present embodiment, a metal clad steel which is one of the materials obtained by compounding two different kinds of metal materials, specifically, austenitic SUS, for example, SUS304 (JIS G 4305), SUS3
By using a baffle made of SUS clad steel in which 16 (JIS G 4305) and a steel material that is the same kind of metal material as the supporting member 6 are used, the baffle and the supporting member can be directly welded. Since it is unnecessary to fasten the reinforcing material welded to the support member and the bolts for supporting the supporting member to the support member, the workability of the steam damper can be improved without losing the original function. Further, since the expensive reinforcing material made of stainless steel is unnecessary, the cost of the steam damper can be reduced and the economical efficiency can be improved. In addition, since bolt tightening is not required, damage to the steam damper will cause bolts and nuts to flow into the water supply system,
As a result, the equipment such as the water supply pump is not damaged, and the safety and reliability of the plant can be improved.

Further, in the present embodiment, as the baffle 2 material, a metal clad steel which is a kind of material in which two different kinds of metal materials are compounded, specifically, austenitic SUS, for example, SUS304 ( JIS
G 4305), SUS316 (JIS G 4305)
And SUS clad steel in which the supporting member 6 and a steel material that is the same kind of metal material are combined are used. However, as the baffle 2 material, the ferritic S material is used instead of the austenitic SUS material.
SU, which is a composite of US, for example, SUS410L (JIS G 4305) and a steel material that is the same kind of metal material as the supporting member 6.
S-clad steel may be used. This ferrite SU
S, for example, SUS410L (JIS G 4305), has a thermal expansion coefficient close to that of steel (iron (Fe)), which is the same kind of metal material as the supporting member 6. As described above, when the SUS clad steel obtained by compounding two kinds of different metal materials having the thermal expansion coefficients close to each other is used as the material of the baffle 2, the steam jet 10 ejected from the spray pipe 1 The baffle that thermally expands due to collision can reduce the thermal stress generated between two different kinds of metal materials.

FIG. 2 is a structural diagram showing the structure of a steam damper according to another embodiment of the present invention. In the figure, baffle 2
Is an austenitic SUS, for example, SUS304
(JIS G 4305), SUS316 (JIS G 4
305) or ferrite type SUS, for example, SUS
SUS clad steel in which 410L (JIS G 4305) and a metal material of the same kind as the structural member 8 inside the condenser are combined is used. In this embodiment, the baffle 2 is directly welded and fixed to the structural member 8 inside the condenser parallel to the spray pipe 1. Further, the support plate 3 supporting the spray pipe 1 is welded and fixed to the structural member 8 inside the condenser at regular intervals. By doing so, a support member that supports the baffle is unnecessary, and the workability of the steam damper can be further improved. In addition, as shown in FIG.
Directly connect the baffle 2 to the structural member 8 inside the condenser orthogonal to
Even if the supporting plate 3 supporting the spray pipe 1 is welded and fixed to the structural member 8 in the condenser by welding, the supporting member for supporting the baffle is unnecessary, and the workability of the steam damper is further improved. Can be improved.

FIG. 4 is a structural diagram showing the structure of a steam damper which is another embodiment of the present invention. In the figure, baffle 2
Is hung by a plurality of U-shaped suspenders 11 welded and fixed on the surface opposite to the spray pipe 1 to the support member 6 whose both ends are welded and fixed to the structural member 8 inside the condenser. It is arranged. Further, in order to prevent the baffle 2 from vibrating, at least one of the hangings 11 is welded to the baffle 2 and is welded to the support member 6. According to the steam damper of this embodiment configured as described above, the baffle has a small number of restraint points, so that the baffle thermally expanded by the collision of the steam jet 10 injected from the spray pipe 1 can extend to some extent. is there. Therefore, excessive stress due to thermal expansion is not applied to the inside of the baffle.

[0027]

According to the present invention, the baffle supported by the support member is welded and fixed to the support member so as to face the first material made of the same material as the support member and the spray pipe. A reinforcing material that is conventionally welded to a baffle and a supporting material that is welded to a baffle by forming a composite with a second material that is disposed on a surface and has a higher corrosion resistance to steam than the first material. Since it is not necessary to tighten bolts for fixing to the member and the baffle can be directly attached to the support member, it is possible to provide a steam damper that can improve workability. In addition, since the reinforcing material is unnecessary, it is possible to provide a steam damper that improves economy. Further, since bolting is unnecessary, it is possible to provide a steam damper that improves the safety and reliability of the plant. Further, it is possible to provide a condenser including the steam damper.

[Brief description of drawings]

FIG. 1 is a structural diagram of a steam damper showing an embodiment of the present invention.

FIG. 2 is a structural diagram of a steam damper showing another embodiment of the present invention.

FIG. 3 is a structural diagram of a steam damper showing another embodiment of the present invention.

FIG. 4 is a structural diagram of a steam damper showing another embodiment of the present invention.

FIG. 5 is a structural diagram showing the structure of a condenser.

FIG. 6 is a structural diagram showing a structure of a conventional steam damper.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spray tube, 2 ... Baffle, 3 ... Support plate, 4 ... Adjustment plate, 5 ... Reinforcement material, 6 ... Support member, 7 ... Steam injection hole, 8 ...
Structural members inside the condenser, 9 ... Steam, 10 ... Steam jet, 1
1 ... U-shaped hanging hand, 12 ... Steam damper, 13 ... Connection barrel,
14 ... Upper body, 15 ... Tube nest, 16 ... Water chamber, 17 ... Lower body, 18 ... Hot well, 19 ... Hot well ceiling plate.

Claims (5)

[Claims] 1. A steam damper having baffles supported by a supporting member above and below a spray pipe, wherein the baffle is welded to the supporting member, and is made of the same material as the supporting member. And the first material
A steam damper, which is arranged on a surface facing the spray pipe and is made of a composite of a second material having a higher corrosion resistance to steam than the first material. 2. A steam damper having baffles supported by a supporting member above and below a spray pipe, wherein the baffle is welded and fixed to the supporting member and to the supporting member. A first material disposed on a surface and made of the same material as the supporting member;
A vapor damper characterized by being composed of a second material, which has a better corrosion resistance to steam than the above material. 3. The vapor damper according to claim 1, wherein the second material is austenitic SUS or ferrite SUS. 4. The steam damper according to claim 1, wherein the first material is steel. 5. A condenser comprising the steam damper according to claim 1.