JP3829476B2 - Condenser piping cleaning method and cleaning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a condenser pipe cleaning method and a cleaning apparatus, and more particularly to a condenser pipe cleaning method and a cleaning apparatus suitable for thermal power and condenser pipe cleaning in a nuclear power plant.
[0002]
[Prior art]
A condenser used in thermal power, nuclear power plants, and the like is a heat exchange facility that returns steam that has driven a turbine to water. This condenser has 10,000 to 10,000 pipes, and heat exchange with the steam outside the pipes is made by passing a heat exchange medium (mainly seawater) through these pipes. ing.
[0003]
However, since seawater is used as a cooling medium, marine organisms (barnacles, etc.) are likely to be generated in the piping, which may deteriorate the flow of seawater in the piping and reduce the efficiency of heat exchange. . In order to prevent this, the piping is cleaned after a certain period of time.
[0004]
FIG. 9 is an operation explanatory view showing a conventional pipe cleaning method. As shown in FIG. 1A, in the conventional pipe cleaning method, a cleaning brush 2 is inserted into the opening of the pipe 1 to be cleaned. And the blow gun 3 which can introduce | transduce the high voltage | pressure water 4 into the side which inserted the said brush 2 for cleaning using a hand is pressed, and the high voltage | pressure water 4 is introduce | transduced in the piping 1. FIG.
[0005]
When the high pressure water 4 is introduced into the pipe in this way, the cleaning brush 2 moves to clean the inside of the pipe. When the cleaning brush 2 moves to the end of the pipe 1, the cleaning brush 2 falls off from the opening at the end of the pipe 1 as shown in FIG. This cleaning operation is repeated for the number of pipes 1.
[0006]
[Problems to be solved by the invention]
However, the seawater used for the movement of the cleaning brush has no spring property (compressibility), and in order to send out the cleaning brush, an amount of water corresponding to the volume of the pipe is required. For this reason, there has been a problem that the passing time of the cleaning brush becomes long and the cleaning efficiency is lowered.
[0007]
Incidentally, a method using compressed air (gas) instead of seawater (liquid) as a cleaning brush is also known. However, the air itself is springy (compressible), so it expands in the pipe, and the cleaning brush feed speed increases too much, so that the cleaning brush may jump out of the end of the pipe and damage the wall surface of the water chamber. was there.
[0008]
Furthermore, since the number of pipes in the condenser reaches 10,000 to 10,000, as described above, it takes a lot of time to clean them one by one using a blow gun. For this reason, the efficiency of the cleaning work itself has been poor. Since the condenser uses seawater as a cooling medium, odor is generated in the water chamber, and a long-time cleaning operation is not preferable.
[0009]
The present invention pays attention to the above-mentioned conventional problems, shortens the passage time of the cleaning brush to shorten the cleaning time per one, and improves the cleaning efficiency of the pipe by cleaning a plurality of pipes at the same time. An object of the present invention is to provide a pipe cleaning method and a cleaning device for a condenser.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the condenser pipe cleaning method according to the present invention includes inserting a cleaning brush from one of the condenser pipes and moving the cleaning brush to the other end of the pipe with high-pressure water. In the condenser cleaning method for scraping off deposits on the pipe, the high-pressure water injection nozzle is slid toward the opposite pipe, and the slide movement is provided for each of the injection nozzles. The tip of the injection nozzle is brought into close contact with the opening of the pipe by a slide mechanism capable of absorbing the amount of movement of the pipe, and the high pressure water is introduced into the pipe from the injection nozzle while the cleaning brush is attached to the pipe. The procedure was such that compressed gas was introduced at a lag time set so that a liquid layer remained behind the cleaning brush until it moved to the end, and the cleaning brush was sent out along the piping.
[0011]
Further, the condenser cleaning device according to the present invention is a condensate having an injection nozzle that is used for pipe cleaning of a condenser and that allows a cleaning brush inserted in the pipe to be sent out along the pipe. A cleaning device for a container, wherein a plurality of the injection nozzles are provided, a horizontal frame having a length exceeding the piping area on the wall surface is provided, the horizontal frame is used as a running rail, and the injection nozzle is mounted on the horizontal frame. And a slide base that is capable of simultaneously advancing and retreating toward the openings of the plurality of pipes facing the tip of the plurality of injection nozzles, and the slide base for each of the injection nozzles. And a slide mechanism capable of absorbing the amount of movement .
[0012]
[Action]
According to the above configuration, after inserting the cleaning brush into the pipe, when the pressure liquid is introduced from the opening of the pipe, the cleaning brush starts to move while cleaning toward the end of the pipe. And after this pressure liquid introduction, compressed gas is introduced into the opening of piping for a predetermined time. Here, since the compressed gas has a spring property (compressibility), unlike the liquid, the moving speed of the cleaning brush can be increased (than the pressure liquid introduction alone) by the expansion of the compressed gas.
[0013]
By the way, when compressed gas reaches the cleaning brush in the pipe, this state is continued until the cleaning brush moves to the water chamber on the other side, and the cleaning brush pops out from the end of the pipe. May be damaged. However, if the compressed gas is introduced for a predetermined time after introducing the pressurized liquid (with a time difference), the compressed gas can be prevented from reaching the cleaning brush, and the cleaning brush can be removed from the end of the pipe. Can be prevented from jumping out vigorously. That is, if the liquid layer is formed behind the cleaning brush until the cleaning brush jumps out from the end of the pipe, the cleaning brush does not directly receive the force from the compressed air. For this reason, the cleaning brush can be prevented from falling from the opening end portion at the end, and thereby damaging the wall surface of the water chamber.
[0014]
In the condenser cleaning device, a plurality of pipes can be cleaned at a time by providing a plurality of injection nozzles. And after cleaning of predetermined piping is completed, what is necessary is just to move an injection nozzle to new piping combining a horizontal movement means and a raising / lowering means. Thus, the cleaning time can be shortened if a plurality of pipes are cleaned at once.
[0015]
Further, since the injection nozzle is held by a projecting frame that is locked between the ceiling surface and the floor surface of the water chamber, there is nothing to block between the injection nozzle and the piping opening. For this reason, the injection nozzle can move so as to cover the piping region, and cleaning can be performed for all the piping.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a condenser pipe cleaning method and a cleaning device according to the present invention will be described below in detail with reference to the drawings.
2 is a perspective view showing the structure of the condenser cleaning device according to the embodiment, FIG. 3 is a front view of the device, and FIG. 4 is a side view of the device. The condenser cleaning device shown in these figures is used for cleaning condensers disposed in thermal power and nuclear power plants.
[0017]
The condenser 10 is a facility for exchanging steam for driving turbines with water, and has 10,000 to 10,000 pipes 12. At both ends of these pipes 12, pipes 12 are connected to both ends. A front water chamber 14 for introducing seawater and a rear water chamber 16 for receiving seawater discharged from the end of the pipe 12 are provided.
If seawater is introduced into the pre-water chamber 14 and the seawater is passed through the pipe 12, heat exchange is performed between the steam 18 passing through the outside of the pipe 12 and the seawater inside the pipe 12, thereby turning the steam into water. I am doing so.
[0018]
By the way, in the condenser 10 mentioned above, since seawater is used, marine organisms, such as a barnacle, adhere to the inner side of the piping 12. FIG. For this reason, it is necessary to periodically clean the inside of the pipe 12 to maintain the soundness of the condenser 10. An apparatus for cleaning the pipe 12 will be described below.
[0019]
The condenser cleaning device 20 is installed in either the front water chamber 14 or the rear water chamber 16, jets a medium into the pipe 12, and has been previously inserted into the pipe 12. The inside of the pipe 12 is cleaned by feeding 22 to the other water chamber side. Such a cleaning device 20 holds a plurality of injection nozzles 24 that match the pitch of the piping 12, the injection nozzle 24, and an opening region of the piping 12 that is located on the wall surface (tube plate) 26 of the front water chamber 14. It is formed with frames 28 for moving the injection nozzle 24 so as to cover it.
[0020]
The frames 28 are vertically locked to the ceiling plate 30 and the floor plate 32 in the front water chamber 14, and a pair of tension frames 34 that fix the cleaning device 20 itself to the front water chamber 14, and the tension frames. 34, and a horizontal frame 36 that can be moved up and down along the projecting frame 34 and movably holds the injection nozzle 24, and is hinged to the projecting frame 34 and the other end is connected to the floor surface 32 It is composed of an anchor frame 38 that is grounded and receives a reaction force for pressing the injection nozzle 24 against the pipe 12.
[0021]
The tension frame 34 has an expansion / contraction mechanism, and is set so as to be set to a length that exceeds the height of the front water chamber 14 when extended. Moreover, the universal joint 40 is provided in the edge part, and even if there exists inclination and a hollow in the ceiling surface 30 and the floor surface 32, a latching can be performed now reliably. Further, an elevating rail 42 is provided on the side surface of the tension frame 34 so that a horizontal frame 36 described later can be guided along the tension frame 34.
[0022]
The injection nozzle 24 is movably held in the horizontal frame 36, and the length of the horizontal frame 36 is set to a length that allows the injection nozzle 24 to move beyond the width of the piping region 44 in the wall surface 26. . Further, an elevating motor 46 as elevating means is provided at both ends of the horizontal frame 36. By driving the elevating motor 46, the injection nozzle 24 held by the horizontal frame 36 is moved up and down by the rail. 42 can be moved up and down. Since the tension frame 34 is locked so as to connect the ceiling surface 30 and the floor surface 32, the movable range of the horizontal frame 36 is set to a range exceeding the range in the height direction of the piping region 44.
[0023]
A traveling rail 48 is provided on the horizontal frame 36, and a traveling carriage 50 is attached to the traveling rail 48 as horizontal moving means for mounting a plurality of injection nozzles 24. It is possible to move along.
The control of the movement amounts of the lifting motor 46 and the traveling carriage 50 and the injection control of the injection nozzle 24 are performed by signals from the header 52 grounded on the rear side of the cleaning device 20, that is, in the vicinity of the anchor frame 38.
[0024]
5 shows a view A in FIG. 3, and FIG. 6 shows a side view of FIG. As shown in these drawings, a plurality of injection nozzles 24 that are in close contact with the opening of the pipe 12 on the wall surface 26 and that make medium injection into the pipe 12 are arranged at the same pitch as the pipe 12 (A dimension in the figure). (In the present embodiment, 10), it is possible to individually eject the medium. Here, the pressure liquid can be introduced into the individual cleaning nozzles 24 from a pressure liquid tank (not shown) via an opening / closing valve, and the compressed gas is also introduced from another compression tank (not shown) via the opening / closing valve. It is possible. The traveling carriage 50 is provided with a slide base 54, and by moving the slide base 54, a plurality of (all 10 stations) injection nozzles 24 can be brought into close contact with the opening of the pipe 12 (FIG. 6). (See the broken line part). A slide mechanism 56 is also provided above the slide base 54. This is provided in each injection nozzle 24. For example, when a certain pipe 12 is plugged, if the injection nozzle 24 is advanced as it is, it collides with the plug and there is a possibility that the injection nozzle 24 may be damaged. For this reason, when a certain load or more is applied, the slide mechanism 56 operates to prevent the spray nozzle 24 from being damaged, and the operation of the slide base 54 is canceled. Each of the injection nozzles 24 is provided with a sensor (not shown) that detects the amount of movement generated in the slide base 54. Based on the value from this sensor, it is determined whether the injection nozzle 24 is in close contact with the opening of the pipe 12. When there is a lid or the like in 12 and the injection nozzle 24 is not in close contact, the energization of the on-off valve is stopped so that high-pressure water and compressed gas cannot be injected from the injection nozzle 24.
[0025]
A procedure for cleaning the pipe 12 in the condenser 10 using the cleaning device 20 configured in this manner will be described.
FIG. 7 is a flowchart showing an operation procedure of the cleaning apparatus 20. As shown in the figure, when cleaning the pipe 12 in the condenser 10, first, the cleaning brush 22 is inserted into all the openings of the pipe 12 on the wall surface 26. Then, the elevating motor 46 and the traveling carriage 50 are operated so that the injection nozzle 24 is aligned with the line of the uppermost pipe 12 in the pipe area 44.
From this state, the traveling carriage 50 is operated, and the tip of the injection nozzle 24 is made to coincide with the opening of the pipe 12 (steps 100 to 120). Next, the slide base 54 is operated to advance the plurality of injection nozzles 24 all at once (step 130).
[0026]
If the pipe 12 to be cleaned has a stopper or the like and the forward movement of the injection nozzle 24 is rejected, the slide mechanism 56 is activated to absorb the movement amount of the slide base 54. Then, it is determined from the moving amount of the slide mechanism 56 whether or not the injection nozzle 24 is in close contact with the opening of the pipe 12, and it is determined whether or not to perform injection from the injection nozzle 24 (step 140).
Then, high-pressure water and compressed air are simultaneously injected from the injection nozzle 24 determined to perform injection, and the cleaning brush 22 inserted in advance into the pipe 12 is sent to the end of the pipe 12 (step 150).
[0027]
FIG. 8 is a time chart showing the opening timings of the opening / closing valves for high-pressure water and compressed air. FIG. 1 applies the time chart shown in FIG. 8 to the opening of the pipe 12 from the injection nozzle 24. It is sectional drawing which showed the state which sends out compressed air from high pressure water. As shown in these drawings, when high-pressure water and compressed air are introduced into the opening of the pipe 12, the introduction of compressed air is delayed by a predetermined time (t seconds in the figure) with respect to the introduction of high-pressure water. To do.
[0028]
When the time difference between the introduction of the high-pressure water and the introduction of the compressed air is set to a certain value or more, only the high-pressure water is jetted from the jet nozzle 24 in the initial cleaning state as shown in FIG. The cleaning brush 22 moves inside the pipe 12 only by the high-pressure water 58.
The open / close valve for high-pressure water is released, and the open / close valve on the compressed air side is released when a predetermined time (t seconds in the figure) elapses. This state is shown in FIG. When the compressed air 60 is introduced into the pipe 12, the compressed air 60 itself tends to expand, so that the speed of passing through the pipe 12 is higher than that of the high-pressure water. For this reason, the compressed air 60 overtakes the high-pressure water 58 with time and approaches the cleaning brush 22 side.
[0029]
However, as shown in FIG. 1 (3), even before the cleaning brush 22 jumps out from the end of the pipe 12, there is a difference in the injection timing between the high-pressure water 58 and the compressed air 60. A liquid layer is always interposed between the cleaning brush 22 and the compressed air 60.
Therefore, as shown in FIG. 1 (4), when the cleaning brush 22 jumps out from the end of the pipe 12, the cleaning brush 22 does not directly touch the compressed air 60. Fall from the end of the. This is because the cleaning brush 22 is not directly subjected to the force caused by the expansion of the compressed air 60 but is simply pushed out by the high-pressure water 58. Thus, even if the cleaning brush 22 moves to the end of the pipe line, a time difference is provided in the introduction timing of the high-pressure water 58 and the compressed air 60 so that the liquid layer always remains at the end of the cleaning brush 22. In this case, it is possible to prevent the cleaning brush 22 from jumping out from the end of the pipe 12 and damaging the rear water chamber 16. Further, since not only high-pressure water but also compressed air is used for feeding the cleaning brush 22, the cleaning brush is accelerated in the pipe 12 due to the expansion of the compressed air, and the passage time of the pipe 12 (cleaning time of the pipe 12). Can be shortened.
[0030]
After the piping 12 is cleaned by the procedure as described above, the injection nozzle 24 is moved backward (step 160). And it moves to the horizontal direction by the pitch for 10 pipes, and cleaning of the new pipe 12 is started (steps 170 to 220).
When the cleaning of the uppermost pipe 12 is completed by repeating such a cleaning process, the elevating motor 46 is operated and lowered by one pitch of the pipe 12 in the vertical direction (step 240, step 250). Then, the traveling carriage 50 is operated again, and the piping 12 on the lower stage is cleaned. If these operations are repeated up to the lowermost pipe 12, the cleaning of the pipe 12 in the pipe region 44 can be completed.
[0031]
【The invention's effect】
As described above , according to the condenser pipe cleaning method according to the present invention, the cleaning brush is inserted from one side of the condenser pipe, and the cleaning brush is moved to the other end of the pipe by high-pressure water. In the condenser cleaning method for scraping off deposits on the pipe, the high-pressure water injection nozzle is slid toward the opposite pipe, and the slide movement is provided for each of the injection nozzles. The tip of the injection nozzle is brought into close contact with the opening of the pipe by a slide mechanism capable of absorbing the amount of movement of the pipe, and the high pressure water is introduced into the pipe from the injection nozzle while the cleaning brush is attached to the pipe. Compressed gas was introduced at a lag time set so that a liquid layer remained behind the cleaning brush until it moved to the end, and the cleaning brush was sent out along the pipe. Et al., It is possible to shorten the transit time of the cleaning brush, with it it is possible to shorten the cleaning time.
[0032]
Moreover, according to the condenser cleaning device according to the present invention, it has an injection nozzle that is used for pipe cleaning of the condenser and that allows a cleaning brush inserted in the pipe to be sent out along the pipe. A device for cleaning a condenser, wherein a plurality of the injection nozzles are provided, a horizontal frame having a length exceeding a piping region on a wall surface is provided, the horizontal frame is used as a traveling rail on the horizontal frame, and the injection nozzles are provided The horizontal movement means includes a slide base capable of simultaneously advancing and retreating toward the openings of the plurality of pipes opposed to the tip ends of the plurality of injection nozzles, and each of the injection nozzles. and capable of absorbing sliding mechanism the amount of movement of the slide base, since having a, a plurality of pipes with the injection nozzle can be moved so as to cover the piping area same It is possible to clean can be shortened cleaning time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which compressed air is sent out from an injection nozzle 24 to an opening of a pipe 12 by applying the time chart shown in FIG.
FIG. 2 is a perspective view showing the structure of the condenser cleaning device according to the embodiment.
FIG. 3 is a front view of the condenser cleaning device according to the embodiment.
FIG. 4 shows a side view of the condenser cleaning device according to the embodiment.
5 shows an arrow A in FIG. 3. FIG.
6 shows a side view of FIG.
7 is a flowchart showing an operation procedure of the cleaning apparatus 20. FIG.
FIG. 8 is a time chart showing opening timings of opening / closing valves for high-pressure water and compressed air.
FIG. 9 is an operation explanatory view showing a conventional piping cleaning method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Piping 2 Cleaning brush 3 Blow gun 4 High pressure water 10 Condenser 12 Piping 14 Front water chamber 16 Rear water chamber 18 Steam 20 Condenser cleaning device 22 Cleaning brush 24 Injection nozzle 26 Wall surface 28 Frames 30 Ceiling board 32 Floor plate 34 Stretch frame 36 Horizontal frame 38 Anchor frame 40 Universal joint 42 Lifting rail 44 Piping area 46 Lifting motor 48 Traveling rail 50 Traveling carriage 52 Header 54 Slide base 56 Slide mechanism 58 High-pressure water 60 Compressed air

Claims (2)

A pipe cleaning method for a condenser in which a cleaning brush is inserted from one of the pipes of the condenser, and the cleaning brush is moved to the other end of the pipe with high-pressure water to scrape off deposits on the pipe. The tip of the injection nozzle is moved by the slide mechanism capable of absorbing the amount of movement of the slide movement provided to each of the injection nozzles by sliding the injection nozzle of the high-pressure water toward the pipes facing each other. The liquid layer remains behind the cleaning brush until the cleaning brush moves to the end of the pipe while the high pressure water is introduced into the pipe from the injection nozzle in close contact with the opening. A pipe cleaning method for a condenser, wherein a compressed gas is introduced at a difference in dwell time and the cleaning brush is sent out along the pipe. A condenser cleaning device having an injection nozzle that is used for pipe cleaning of a condenser and that allows a cleaning brush previously inserted into the pipe to be sent out along the pipe. Provided with a horizontal frame having a length exceeding the piping area on the wall surface, provided with a horizontal moving means on the horizontal frame, the horizontal frame as a running rail and mounted with the injection nozzle, the horizontal moving means , A slide base capable of simultaneously advancing and retreating toward the openings of the plurality of pipes facing the tips of the plurality of injection nozzles; and a slide mechanism capable of absorbing the amount of movement of the slide base in each of the injection nozzles. A condenser cleaning device characterized by that.

Images