JP2947985B2 - Heat exchanger water chamber working equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger heat pipe maintenance work automation apparatus, and more particularly to a heat exchanger water chamber work apparatus suitable for cooling pipe maintenance work of a large heat exchanger such as a turbine condenser. .

[0002]

2. Description of the Related Art A typical example of a large-sized heat exchanger is a condenser of a power plant. In this condenser, various maintenance works are usually performed at regular inspections, that is, a cooling pipe (thin pipe) brush. Cleaning, eddy current testing, etc. are performed, but these operations are often performed in a narrow water chamber of the condenser in seawater atmosphere, so the working environment is severe and the number of cooling pipes Since the work is enormous and requires a long time, there has been an extremely high demand for automation of the work.

In view of the above, various proposals have been made for such a work automation apparatus. For example, Japanese Patent Application Laid-Open No. 61-217603 discloses a tube sheet 3 having cooling pipes arranged therein as shown in FIG. A work robot 20 that moves by itself on a plane has been proposed.
As shown in (a), (b), and (c) of FIG. 3, the moving support legs 21 are inserted into and removed from the inside of the heat transfer tubes (cooling tubes) 4 arranged on the surface of the tube sheet 3, and the holding and moving are repeated. It is.

In order for the moving mechanism of the work robot 20 to operate normally, as shown in FIG. 4, the pitch of the cooling pipes is fixed (the pitch of the cooling pipes is constant, that is, the spacing between the center lines of the cooling pipes is a constant value or the pitch of the same pitch). (Integer multiple).

On the other hand, as regards the automation of maintenance work for cooling pipes of unequal pitch pipe arrangement, see, for example, Japanese Utility Model Laid-Open No. 61-154495 shown in FIG.
As in JP-A-223598, there is also known a method in which a moving rail is set in front of the cooling tube sheet 3 and the working device is moved and positioned on this rail. Here, FIG. 7 (a) shows an enlarged main part, and FIG. 7 (b) shows the whole.

In FIG. 6, reference numeral 2 denotes a water chamber of a condenser,
24 is a vertical rail, 25 is a horizontal moving rail, and 26 is a water chamber working robot.
27 is a vertical movement guide rail, 28 is a horizontal rail,
Reference numeral 29 denotes a support leg, and reference numeral 30 denotes a scalar arm. The water chamber 2 is the same as the prior art shown in FIG.

[0007]

With the recent automation (NC) of machine tools, drilling for cooling pipes of heat exchanger tube sheets has also been carried out by a multi-axis NC machine. Most of the new condensers have a constant and high accuracy of the hole pitch.

However, the conventional (existing) condensers (heat exchangers) have a relation that a manual drill or the like is used. For example, as shown in FIG. It is not that high.

By the way, the automation of the condenser cooling pipe maintenance work is often applied to the work of the existing machine. Therefore, in the above-mentioned prior art, the method using the work robot assumes a fixed pitch pipe arrangement. Therefore, it is difficult to apply it to condensers with unequal pitch pipe arrangement, which still occupy a large number of plants and will continue with the longevity of the plant in the future, and users cannot fully automate their work. There was a problem.

On the other hand, according to the prior art using the moving rail, it is possible to apply to the maintenance work of the unequal pitch pipe cooling pipes, but the following problems occur in actual operation. .

(1) Increase in the number of steps for setting and removing rails in the water chamber In the prior art shown in FIG. 6, in the water chamber of the large condenser (approximately 5 to 6 m in the vertical direction and approximately 3 to 4 m in the horizontal direction). It takes time to remove the rail setting. In particular, the vertical rail has a height of 5 to 6 from the bottom to the ceiling of the water chamber as described above.
It is necessary to use a long rail corresponding to m and the weight increases, so such a rail is carried into the water chamber through the water chamber manhole or the seat on the wall of the water chamber, and set and removed in the water chamber. However, the man-hour is increased due to the large size.

In the prior art shown in FIG. 7, it is necessary to fix the above-mentioned vertical rails on both sides of the bottom surface and the ceiling surface of the water chamber. This is a work, which increases the number of man-hours and involves dangerous work in high places.

(2) Increase in the number of man-hours for assembling the split rails in the water chamber In the prior art, when the rails are carried into the water chamber, the rails are moved from the opening of the manhole or other seat attached to the wall of the water chamber into the water chamber. Although it is necessary to carry the rails, since the vertical rails are long, it is difficult to carry them into the water chamber unless they are in a divided state. However, when the rails are divided, a work process for assembling the divided rails in the water chamber is required, and for fixing the rails to the ceiling of the water chamber, scaffolding work is also required. Therefore, the work before half a day to one day is required.

In particular, when a thermal power plant is shut down on a weekend (to suspend the plant for two days on Saturdays and Sundays when the power demand decreases and to perform maintenance work such as cleaning condenser tubes). When applying this robot, it is necessary to minimize the time required for assembling, setting, and disassembling the rail, and the operation time of the current automation device is 20 to 25 seconds /
Judging from one thin tube x about 7000 tubes / one tube nest = 39 to 48 hours, the time available for rail assembly and setting must be within 1 to 2 hours.

Further, since it is necessary to work on each braided tube lined up on the tube sheet surface, the positional accuracy of the rail with respect to the tube plate is required to be high accuracy (approximately ± 1 mm as a guide). . In addition, when performing work such as brush driving on a thin tube, the reaction force to the rail at that time is 40 to 60k.
g, it is necessary to have sufficient strength against reaction force.

However, the above-mentioned conventional technology has a problem that it is difficult to satisfy these requirements.

An object of the present invention is to solve the above problems,
Heat exchanger water chamber working equipment that can be easily applied to automation of maintenance work of unequal pitch pipe cooling pipes, and that rail loading, assembling, and setting work can be performed in a short time and easily. Is to provide.

Further, according to the present invention, the rail can be set without the worker entering the water chamber, the worker is released from a bad environment in the water chamber, and the safety of the worker can be easily ensured. The purpose is to provide a working unit for a water exchanger.

It is another object of the present invention to provide a rail-type condenser water chamber working device that can easily perform positioning with high accuracy when setting rails and can also secure the rigidity of the rails themselves.

[0020]

In order to achieve the above-mentioned object, the present invention provides an opening / closing opening for rail elevating in a part of a heat exchanger water chamber, and a rail elevating device near the opening. The rails divided into about 1 m / 1 are installed, and the rails are lowered into the water chamber by the rail lifting device while being sequentially combined outside the water chamber.

Further, by mounting a positioning support in the lower part of the water chamber in advance, the rail descending from the upper part of the water chamber is received by the support and automatically positioned. is there.

[0022]

According to an embodiment of the present invention, a gear mechanism that meshes with a rack mechanism mounted on the rail side is built in a rail elevating device set above the water chamber. , A motor and its control device.

The first rail of the divided rails is set on the rail lifting device, and then the motor power switch is turned on, and the gear mechanism is driven to lower the rail into the water chamber. When the rail is lowered, it is essential to stop the motor when the rail has descended to an appropriate position to prevent the rail from falling into the water chamber. If the rail falls the distance from the ceiling of the water chamber to the bottom of the water chamber (5-6m), the protective lining (generally rubber lining) on the bottom of the water chamber may be damaged and the water chamber may leak. Comes out.

Therefore, as a method of stopping the rail at an appropriate position, a method of stopping the rail by an electrical sequence using a sensor, a method of mechanically stopping the rail by a special object, an interfering object, or the like, and a method of using both in combination. There is a way out. As a result, there is no possibility of a malfunction such as falling of the split rail into the water chamber.

When the first rail stops, the second rail is connected to the end of the first rail, and then the switch of the motor is turned on again to drive the gear mechanism to lower the rail. . Next, when the second rail stops, the third rail is connected to the end of the second rail, and then the rail is lowered. By repeating the above operation, the rail reaches the bottom of the water chamber while the rail descends in the water chamber, and the vertical rail can be set from the outside without entering the water chamber.

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a working apparatus for a heat exchanger in a water chamber according to the present invention.

FIG. 1 shows a schematic configuration around a large heat exchanger water chamber such as a condenser to which an embodiment of the present invention is applied.

A conventional large heat exchanger such as a condenser has a tube plate 3 attached to a side surface of a body 1 and a cooling water chamber 2 attached via the tube plate 3. A large number of heat transfer tubes 4 for heat exchange are fixed to the tube sheet 3, and the ends of the heat transfer tubes 4 are open to the surface of the tube sheet 3 on the water chamber side. In the case of a large condenser, the number of heat transfer tubes 4 is 7 for one tube nest.
It reaches 000-8000.

The cooling water pipe 5 is connected to the water chamber bottom plate 6.
In a normal operation state of the condenser, the cooling water flows from the cooling water pipe 5 into the water chamber, fills the condenser water chamber with the cooling water, and flows into each heat transfer pipe through the heat transfer pipe 4 opening. Has become. On the wall surface of the water chamber 2, 450-600 φ is provided for checking the inside of the water chamber or performing work in the water chamber.
Water chamber manhole 7 is installed.

In this embodiment, the water room ceiling plate 8 is used.
Is provided with a rail elevating opening 9 in a part thereof. The rail lifting / lowering opening 9 is openable and closable, and the rail-type condenser water chamber working device according to the present invention is not used, or the water in the water chamber is closed.

A rail elevating device 10 is mounted near the rail elevating opening 9, and the divided rails 11 and 12 are sequentially carried into the water chamber using the rail elevating device 10.

The rail 11 is of a split type, and when the rail is carried into the water chamber through the rail elevating opening 9,
The rail division units 12 are sequentially connected to the upper end of the rail 11 already carried in, and work is advanced so that the lower end 14 of the rail 11 finally reaches the water chamber bottom plate 6.

A rail position setting jig 13 is mounted on the water chamber bottom plate 6 in advance. Therefore, the lower end 14 of the rail 11 descending in the water chamber follows the rail setting jig 13. The position is set and the positioning is automatically held.

Therefore, in this operation, a special operation for setting the rail position by the operator in the water chamber is not required, and the rail lower end portion 14 and the rail setting jig 13 are fitted in a tapered shape. By doing so, the position can be accurately set.

Next, the configuration of the rail lifting device 10 will be described.
This will be described in detail with reference to FIG. The rail lifting device 10 includes:
A gear mechanism 32 that meshes with a rack 31 formed on the rail 11 is provided inside the rail elevating opening 9 so as to surround the opening. The gear mechanism 32 is driven by a motor, and starts to operate by a manual switch operation (not shown). When the rail 11 is lowered by a predetermined amount, an electric stopper 33 composed of a proximity switch detects the movement, and detects the movement of the motor. In addition, a mechanical stopper 34 is provided separately so that even if the electric stopper 33 malfunctions and cannot stop the movement of the rail, this mechanical stopper 34 is provided. The movement of the rail is stopped by the stopper 34, so that it is possible to reliably prevent the rail from falling onto the water chamber bottom plate 6.

Next, regarding the operation for connecting the rails,
This will be described with reference to FIGS. FIG. 9A The first rail 11 is set on the rail lift 10. A gear mechanism 32 is mounted in the rail lift device 10 and is driven by a motor 36.
Contact 3 that is opened by a signal from a manual switch contact 39 and an electric stopper 33 for motor start
8 are connected in series with the power source 37 and the motor 36. When the first rail 11 is to be set, the contact 39 is left open.

FIG. 9 (b) After the first rail 11 is set on the rail elevating device 10, the manual switch is operated to close the contact 39, whereby the first rail 11 starts to descend into the water chamber 2. I do.

FIG. 9 (c) When the rail 11 descends by a predetermined distance and the electric stopper 33 detects the striker 40 attached to the rail 11, the contact 38 is opened and the motor 36 is stopped.
The lowering of the rail 11 is stopped. At this time, as described above, in the event of an emergency, the rail 11 is forcibly stopped by the mechanical stopper 34.

After confirming that the rail 11 has stopped, the mechanical stopper 34 is removed. The mechanical stopper 34 has an attachment structure by screwing or the like so that attachment and detachment can be easily performed.

FIG. 10 (d) The second rail 12 is attached to the upper end of the first rail 11. In this embodiment, the bolts 41 are used as an example of the mounting method.

FIG. 10 (e) After the second rail 12 is mounted, the contact switch 39 is turned on by operating the motor start manual switch, and the rail is lowered again.

By repeating the above-described operations (a) to (e), the unit length of the rail is, for example, 50 cm to 1 cm.
Even if it is as short as about m, the vertical rail 11 can be set in the water chamber 2 of the condenser. When the rail is removed, the operations (a) to (e) may be performed in reverse.

Therefore, according to this embodiment, there is no need for manual work such as rail setting work in the condenser water chamber and preliminary work such as scaffolding and scaffold disassembly in the water chamber accompanying the rail setting work. Significant reduction can be achieved.

As a result, according to the present invention, it is possible to set the rail in one to two hours, and it is possible to perform the thin tube cleaning operation during the above-mentioned weekend stop period. In addition, since the worker does not need to enter the water chamber, work safety is greatly improved. Furthermore, the rail position can be set with high precision without performing any special and advanced work such as setting the position of a long and heavy rail in the water chamber, thereby improving the reliability of the work. . In addition, by dividing the rails, it is possible to design the rails of one division unit with high rigidity as long as handling is not hindered. Therefore, the rails were combined and formed in the water chamber. In this case, the rigidity can be easily increased.

Next, another embodiment of the present invention will be described with reference to FIG. In the embodiment of FIG. 12, a wire 42 is connected to a hollow portion inside a rail by a plurality of springs 42a.
, One end of the wire 42 is fixed to the tip of the rail 11, and the other end is fixed to a beam 43 or the like outside the water chamber.

According to this embodiment, the rail can be lowered and set into the water chamber without the rail lifting device, and the rail 11 can be reliably prevented from falling into the water chamber 2 as it is.

Next, still another embodiment of the present invention is shown in FIG.
This will be described with reference to FIG. In the embodiments of FIGS. 12 and 13, the actuator for actually cleaning the hole of the heat transfer tube 4 from the rail elevating opening 9 of the water chamber ceiling plate 8 after setting the rail 11 in the water chamber 2. 44 is carried into the water chamber 2 along the rail 11, and thereafter the cleaning operation is performed while moving up and down by the rail 11.

Therefore, according to this embodiment, not only the rail setting operation but also the actuator for operating the pipe hole can be set on the rail without an operator entering the water chamber. When performing the work in the water chamber, the worker does not need to enter the water chamber at all.

As a result, the working time can be greatly reduced, and at the same time the working safety is improved. When the actuator 44 is lowered into the water chamber in accordance with the rail 11, the rack mechanism 31 on the rail can be used.

Next, FIG. 14 also shows an embodiment of the present invention, in which a vertically movable horizontal rail 45 is passed along two vertically set rails 11 in a water chamber. A work actuator 46 that can move laterally along the rail is installed on the work 45.

In the embodiment shown in FIG.
It is unavoidable that the worker enters the water chamber when attaching the 5 to the vertical rail 11, but on the other hand, the actuator 46 is supported by the two vertical rails 11, so Even if the reaction force at the time of cleaning the heat tube 4 becomes a considerably large value, it has an advantage that it can sufficiently counteract and always ensure high reliability.

[0052]

According to the present invention, the setting time of the work rail for the heat exchanger water chamber such as the condenser can be greatly reduced, and the time required for the thermal power plant to shut down on a weekend can be shortened. It is possible to perform condenser maintenance.

Further, the work can be performed without the worker entering the water chamber, and the safety is high.

Further, high-accuracy positioning of the rails can be performed easily, and the rigidity of the rails can be increased.

[Brief description of the drawings]

FIG. 1 is a partially transparent perspective view showing one embodiment of a heat exchanger water chamber working device according to the present invention.

FIG. 2 is a plan view showing an example of a prior art of a heat exchanger water chamber working device.

FIG. 3 is an operation explanatory diagram of an example of a prior art of a heat exchanger water chamber working device.

FIG. 4 is an explanatory view of a state of equi-pitch piping of the heat exchanger water chamber working device.

FIG. 5 is an explanatory view of a unequal-pitch piping state of the heat exchanger water chamber working device.

FIG. 6 is a perspective view showing another example of the prior art of the heat exchanger water chamber working device.

FIG. 7 is an explanatory view showing still another example of the prior art of the heat exchanger water chamber working device.

FIG. 8 is an explanatory view of a rail elevating device in one embodiment of the heat exchanger water chamber working device according to the present invention.

FIG. 9 is an explanatory view of the operation of the rail lifting / lowering device in one embodiment of the heat exchanger water chamber working device according to the present invention.

FIG. 10 is an explanatory view of the operation of the rail lifting / lowering device in one embodiment of the heat exchanger water chamber working apparatus according to the present invention.

FIG. 11 is a cross-sectional view showing another embodiment of the water exchanger in the heat exchanger according to the present invention.

FIG. 12 is a partially transparent perspective view showing still another embodiment of the heat exchanger water chamber working device according to the present invention.

FIG. 13 is a sectional view of the embodiment shown in FIG.

FIG. 14 is a partially transparent perspective view showing still another embodiment of the heat exchanger water chamber working device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Condenser fuselage 2 Water room 3 Tube plate 4 Heat transfer tube (cooling tube) 5 Cooling water piping 6 Water room bottom plate 7 Water room manhole 7 8 Water room ceiling plate 9 Rail elevating opening 10 Rail elevating device 11 Split type Rail 12 Split type rail 13 Rail position setting jig 14 Lower end of rail

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kappei Tanemura 2-4-1 Nishi-Atsujigaoka, Chofu-shi, Tokyo Tokyo Electric Power Company R & D Laboratory (72) Inventor Nobuhiro Suzuki 2-4-1 Nishi-Atsujigaoka, Chofu-shi, Tokyo Technical Research Institute, Tokyo Electric Power Company (72) Inventor Shigeo Oda 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Hitachi, Ltd.Hitachi Plant (72) Yoshio Sumitani 3-1-1, Sachimachi, Hitachi-shi, Ibaraki No. 1 Hitachi, Ltd. Hitachi Plant (72) Inventor Katsuki Otake 3-1-1, Kochicho, Hitachi City, Ibaraki Prefecture Hitachi Ltd., Hitachi Plant (72) Inventor Yasuo Fujitani Yukio Fujitachi, Ibaraki Prefecture Hitachi 1-1, Hitachi Ltd. Inside the Hitachi Plant (72) Kunimi Ban 3-1-1, Sakaicho, Hitachi City, Ibaraki Prefecture No. Co., Ltd.Hitachi, Ltd.Hitachi Plant (72) Inventor Yasuki Koshiishi 580 Kakuda, Aikawa-cho, Aiko-gun, Kanagawa Prefecture Inside Tama Plant of Hitachi Machinery Engineering Co., Ltd. No. 580, Tachi Machine Engineering Co., Ltd., Tama Plant (72) Inventor Koji Moriya 580, Kakuda, Aikawa-cho, Aiko-gun, Kanagawa Prefecture, Japan Tama Plant, (56) References JP-A-2-48144 (JP, A) Japanese Utility Model Showa 61-154495 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F28G 15/04

Claims (5)

(57) [Claims] 1. A tube sheet surface near a tube sheet surface in a water chamber.
Water that is facing in the water chamber
In a heat exchanger water chamber working apparatus of a system in which rails are temporarily provided between room wall members and work is performed in the water chamber using the rails, as the rails, a plurality of parts capable of being connected and separated from each other are provided.
Using a split rail, the plurality of split rails are combined with the water chamber wall member.
One by one with openable opening formed on the side
While being carried into the water chamber,
A working device for a heat exchanger in a water chamber, wherein the rail is formed in a room. 2. The invention according to claim 1, wherein said water is first introduced into the other inner surface of said water chamber wall member.
The tip of the split rail reaches and the rail is formed
When the water chamber wall portion reaches the tip of the split rail
A working device for a water chamber in a heat exchanger, wherein a positioning member to which the tip part is fitted is provided at a material position . 3. The water chamber wall according to claim 1, wherein one of said water chamber wall members is a ceiling member.
Heat exchanger water chamber working mechanism other member, characterized in floor surface member der Rukoto. 4. The invention according to claim 1, wherein the plurality of split rails include a rack, and
Is provided with a gear mechanism, and is driven by the rotation of the gear mechanism.
A water-chamber working apparatus for a heat exchanger, wherein the split rail is configured to move. 5. The invention according to claim 1, wherein said plurality of divided rails communicate with each other through the inside.
Wire is provided, and the wire is used to move the split rail.
A working device for a heat exchanger in a water chamber, characterized in that the working is performed.