Trash removal device and trash removal method

Abstract

To provide a trash removal device that can remove trash attached to a net screen fixed facing the direction of flowing water in a water intake channel.SOLUTION: Trash removal devices (1, 2) each includes capturing means (10) that is mounted facing a net screen (50) and can move up and down, and towing means (20) that, while supporting the capturing means (10), moves the capturing means (10) up and down between the water and the ground. The capturing means (10) includes a rake (13) for removing trash (GB) attached to the net screen (50), and a bucket (11) for capturing the trash (GB) scraped off by the rake (13).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a dust removal device and a dust removal method that are provided in association with a screen in, for example, an intake channel of a thermal power plant. [Background technology]

[0002] For example, a screen is installed in the intake channel of a power plant to filter out debris, but if a large amount of debris adheres to the screen, it may interfere with the intake of water. Therefore, the debris is removed from the screen and then collected. The following methods are known for removing and collecting trash. 1. In a traveling screen, the screen is rotated and the part of the screen that is lifted out of the waterway is washed with cleaning water to remove and collect debris. 2. At the bar screen, a rake is used to lift the debris and remove and collect it. 3. For net screens, lift the net screen out of the waterway and rinse it with cleaning water to remove and collect debris.

[0003] Dust removal devices for traveling screens and bar screens are large and expensive, and are not suitable for small intake channels. Therefore, it is preferable to use a fixed net screen as a dust removal device for intake channels with small water intake volumes. In this case, it is necessary to lift the net screen from the intake channel and manually remove the debris attached to the net screen on the ground outside the intake channel, which is a time-consuming process.

[0004] Patent Document 1 discloses a dust removal device that uses a net screen. The dust removal device in Patent Document 1 moves scraping means in the direction of flowing water while rotating along a dustproof net (net screen) that covers a water intake channel. As this movement occurs, vortices are generated along the surface of the dustproof net, and in addition to being scraped off by the contact of the scraping means, the vortex also forcibly scrapes off the dustproof net. The scraped-off dust is carried downstream by the flowing water and is not collected. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-313849 Summary of the Invention [Problem to be solved by the invention]

[0006] The dust removal device of Patent Document 1 achieves the purpose of dust removal by carrying the scraped-off dust on the flowing water and flowing it downstream. Therefore, the dust removal device of Patent Document 1 is only applicable to an arrangement in which the scraped-off dust from the net screen flows downstream, and is not suitable for a net screen that is placed opposite the direction of the flowing water, for example.

[0007] SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a dust removal device and a dust removal method that can remove dust and debris adhering to a net screen that is fixed in a water intake channel facing the direction of flowing water. [Means for solving the problem]

[0008] The dust removal device of the present invention comprises: a capturing means provided facing the net screen and capable of being raised and lowered; and towing means for supporting the capturing means and raising and lowering the capturing means between water and land. The capture means is A rake to remove debris from the net screen; and a bucket for capturing debris removed by the rake.

[0009] The traction means preferably comprises: The plurality of pulling means are moved in a circular movement in the vertical direction, thereby continuously raising and lowering the capturing means.

[0010] The traction means preferably comprises: The catching means is raised and lowered intermittently by linearly reciprocating the pulling means in the vertical direction.

[0011] The rake preferably comprises: It is provided at an angle so that its tip faces upward relative to the bucket.

[0012] Preferably, on the ground, A collection container is provided to receive debris from the bucket.

[0013] In the dust removal method of the present invention, the capturing means is raised along the net screen while scraping off the dust adhering to the net screen. The capture means is A rake to remove debris from the net screen; and a bucket that captures the debris scraped off by the rake. The rake is slid across the net screen while the catch means is raised along the net screen. [Effects of the Invention]

[0014] According to the present invention, it is possible to remove debris adhering to a fixed net screen while the net screen remains installed in the intake channel. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view of a dust remover according to a first embodiment. FIG. [Figure 2] 1 is a front view of a dust remover according to a first embodiment. FIG. [Figure 3]1A and 1B are diagrams showing a bucket for capturing dust used in a dust removal device according to a first embodiment, where (a) is a plan view (PV), (b) is a front view (FV), and (c) is a side view (SV). [Figure 4] 1 is a side view showing how the dust removal device according to the first embodiment removes dust from a net screen and collects the removed dust on the ground. FIG. [Figure 5] 10A and 10B are side views of a dust remover according to a second embodiment, in which (a) shows the start of dust removal, and (b) shows the recovery of captured dust. [Figure 6] FIG. 10 is a front view of a dust remover according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a dust remover 1 and a dust remover 2 according to embodiments will be described with reference to the accompanying drawings. The dust remover 1 and the dust remover 2 scrape and remove debris GB, such as jellyfish, from a net screen 50 fixed vertically to a water intake channel 100, and capture and collect the debris GB by pulling it up to the ground. To this end, the dust remover 1 and the dust remover 2 include a capturing means 10 for capturing the debris GB removed from the net screen 50 and towing means 20A and 20B for raising and lowering the capturing means 10 along the net screen 50. The capturing means 10 is disposed opposite the net screen 50 and is raised and lowered between the water surface and the ground surface by the towing means 20A and 20B. The dust remover 1 and the dust remover 2 differ in that the former continuously raises and lowers the capturing means 10, while the latter intermittently raises and lowers the capturing means 10. Below, the dust remover 1 according to the first embodiment and the dust remover 2 according to the second embodiment will be described in order.

[0017] [First embodiment: Figures 1, 2, 3, and 4] As shown in Fig. 1, the dust removal device 1 is installed in an intake channel 100 that takes in seawater as cooling water, for example, in a nuclear power plant or a thermal power plant. The intake channel 100 is provided with a net screen 50 that prevents debris GB floating in the sea, such as jellyfish, plastic bags, and containers, from flowing downstream (L) of the intake channel 100. The dust removal device 1 is installed in association with the net screen 50. The net screen 50 is made of, for example, a metal mesh that is fixed at a predetermined position in the intake channel 100 that receives a water flow WF from the sea. In the embodiment, the specifications of the net screen 50 are not important, and for example, the mesh opening is determined depending on the size of the debris GB to be attached. In the dust removal device 1, the upstream (U) and downstream (L) directions are defined as shown in FIG. 1 according to the direction of the water flow WF, and the first direction (X), second direction (Y), and third direction (Z), which are perpendicular to each other, are defined as shown in FIGS. 1 and 2.

[0018] [Configuration of dust removal device 1: See Figures 1 and 2] The dust removal device 1 can continuously collect the dust GB adhering to the net screen 50. The dust removal device 1 includes a plurality of capturing means 10, a towing means 20A capable of continuously towing the plurality of capturing means 10, and a collection container 30 that receives the garbage GB pulled up to the ground AG by the capturing means 10 from the capturing means 10.

[0019] [Capturing means 10: see Figures 1, 2, and 3] The capturing means 10 comprises a bucket 11 for capturing the garbage GB removed from the net screen 50, and a rake 13 provided on one side of the bucket 11 in the first direction (X) for scraping and removing the garbage GB from the net screen 50.

[0020] [Bucket 11: See Figure 3] The bucket 11 has an opening 11C on one side in the second direction (Y) and comprises a capture box 11A having a capture chamber 11B for dust GB, and a guide 11D extending from the upper edge of the side of the capture box 11A facing the net screen 50 toward the net screen 50.

[0021] The trap box 11A has a dimension in the third direction (Z) that is approximately equal to the dimension of the net screen 50 in the third direction (Z). Therefore, the trap box 11A can trap any dust GB attached to any part of the net screen 50 in the third direction (Z). The trap box 11A is supported by the towing means 20A so that its opening 11C faces upward. The trap box 11A may be made of any material, such as metal or resin. The same applies to the guide 11D. The trap box 11A may be made of a solid material that does not allow water to pass through, or a mesh-like material that allows water to pass through. A trap box 11A made of a solid material prevents small dust GB from leaking out, while a trap box 11A made of a mesh-like material can minimize the resistance from water when being pulled up by the towing means 20A.

[0022] It is preferable that the capture chamber 11B has a volume large enough to contain all of the garbage GB to be collected. However, even if the garbage GB cannot be contained and some of it exceeds the capture chamber 11B and protrudes from the opening 11C, the garbage GB can be lifted to the ground AG while being loaded onto the bucket 11 being pulled upward. Furthermore, even if the garbage GB falls out of the capture chamber 11B, the garbage GB is scraped off the net screen 50, temporarily avoiding the risk of clogging the net screen 50. However, since the fallen garbage GB may float and repeatedly adhere to the net screen 50, it is preferable that the garbage GB does not fall out.

[0023] Guide 11D guides the debris GB scraped off the net screen 50 by rake 13 toward capture chamber 11B. Guide 11D is inclined upward from the connection point with capture box 11A, and debris GB transferred from rake 13 can slide down the surface of guide 11D and reach capture box 11A. In particular, when bucket 11 is pulled up by towing means 20A, the debris GB resting on guide 11D is subjected to a downward force by seawater, so that the debris GB easily slides down guide 11D. The bucket 11 may be manufactured by fabricating the catching box 11A and the guide 11D as a single member, or may be manufactured by fabricating the catching box 11A and the guide 11D as separate members and joining them together by an appropriate means to form an integrated unit.

[0024] [Rake 13] The rake 13 is attached to the front end of the guide 11D, for example, and can come into contact with the dust GB adhering to the net screen 50 to scrape and remove the dust GB from the net screen 50. The rake 13 is provided so that its front end (tip) faces upward. The shape of the rake 13 is not important as long as it can achieve its purpose. The rake 13 can take various forms, such as a brush-like bundle of multiple thread-like elements, a rake-like structure, or a plate-like structure with multiple claws at its front end. The material of the rake 13 is not critical as long as it can achieve its purpose. The rake 13 can be made of various materials, such as metal, resin, or rubber. However, the rake 13 may come into contact with the net screen 50 when scraping and removing the debris GB from the net screen 50. Therefore, if the net screen 50 is made of a metal material, it is preferable to make the rake 13 out of a resin or rubber material to avoid damaging the net screen 50 through contact with the net screen 50.

[0025] In the illustrated example, a plurality of brush-like rakes 13 are arranged in a row in the third direction (Z) at the front end of the guide 11D. However, as described above, the rake 13 may have various forms. For example, a plate-like rake 13 may be attached to the guide 11D as a single member. In this case, the guide 11D can also serve as the rake 13. The rake 13 may be worn due to contact with the garbage GB and the net screen 50. Therefore, it is preferable that the rake 13 is detachably attached to the guide 11D or the catch box 11A.

[0026] The rake 13 is used to scrape and remove the debris GB adhering to the net screen 50, and is therefore positioned so that its front end can come into contact with the debris GB. In order to scrape and remove the debris GB from the net screen 50, it is preferable that the rake 13 be positioned so that its front end can be pressed against the net screen 50. When the rake 13 is pressed against the net screen 50, the pressed portion slides against the net screen 50 and wears out. Therefore, regular maintenance and inspection of the rake 13 is necessary.

[0027] [Traction means 20A: see Figures 1 and 2] The traction means 20A supports, as an example, a plurality of capturing means 10 at equal intervals and tows the plurality of capturing means 10. To this end, the traction means 20A includes a pair of endless link chains 21A, 21B arranged along the third direction (Z), a pair of first sprocket wheels 23A, 23B around which the upper ends of the link chains 21A, 21B are wound, respectively, and a pair of second sprocket wheels 25A, 25B around which the lower ends of the link chains 21A, 21B are wound. The first sprocket wheels 23A, 23B are rotatably supported at fixed positions on the ground AG, and the second sprocket wheels 25A, 25B are rotatably supported at fixed positions in the intake channel 100. The pair of first sprocket wheels 23A, 23B are connected to both ends of a first rotating shaft 24, and the pair of second sprocket wheels 25A, 25B are connected to both ends of a second rotating shaft 26. Therefore, The pair of first sprocket wheels 23A, 23B rotate in synchronization, and the pair of second sprocket wheels 25A, 25B also rotate in synchronization.

[0028] The traction means 20A includes a rotating electric machine 27 that rotates one of the first sprocket wheels 23A, 23B. When the rotating electric machine 27 is driven to rotate, the pair of first sprocket wheels 23A, 23B rotates, for example, clockwise via the first rotating shaft 24, and in conjunction with this rotation, the pair of link chains 21A, 21B moves around in the clockwise direction in the figure and in the second direction (Y) (vertical direction), for example. For example, if the clockwise direction is defined as forward rotation, the rotating electric machine 27 can rotate in the reverse direction, counterclockwise.

[0029] As shown in Fig. 2, a plurality of capturing means 10 are supported at equal intervals on the pair of link chains 21A, 21B, for example. That is, in the third direction (Z) of each bucket 11, one end is fixed to one link chain 21A by any means, and the other end is fixed to the other link chain 21B by any means. Each bucket 11 is arranged so that its opening 11C faces upward and is perpendicular to the direction in which the pair of link chains 21A, 21B extend, i.e., the second direction (Y). Therefore, when the rotating electric machine 27 is driven to rotate, the buckets 11 move in circles while remaining parallel to each other.

[0030] As shown in FIG. 1, within the range of revolution of link chains 21A, 21B, the side facing net screen 50 is designated as outgoing path 20O, and the opposite side of net screen 50 across outgoing path 20O is designated as returning path 20R. Capturing means 10 moves upward on outgoing path 20O, ascending toward first sprocket wheels 23A, 23B. At first sprocket wheels 23A, 23B, capturing means 10 reverses its previous orientation upside down and reaches returning path 20R. Reaching returning path 20R, capturing means 10 moves with opening 11C of bucket 11 facing downward and descends to second sprocket wheels 25A, 25B. After passing second sprocket wheels 25A, 25B, capturing means 10 reverses its previous orientation upside down, and reaches outgoing path 20O with opening 11C facing upward. While rotating electric machine 27 is driven to rotate, capturing means 10 repeats this revolution.

[0031] [Collection container 30: see Figure 1] The collection container 30 receives and collects the garbage GB from the capturing means 10, which is turned upside down by the first sprocket wheels 23A and 23B. Therefore, the collection container 30 is provided below the first sprocket wheels 23A and 23B and adjacent to the return path 20R. As an example, the collection container 30 can move back and forth between a collection position P1 where it receives the garbage GB and a standby position P2 where it waits until it receives the garbage GB. When the opening 11C of the bucket 11, whose position is inverted upside down by the first sprocket wheels 23A, 23B, faces downward, the collection container 30 waits at the collection position P1 below the bucket 11 to receive the falling garbage GB. After receiving the garbage GB, the collection container 30 can quickly move to the standby position P2.

[0032] [Dust removal and collection operation: See Figure 4] Next, the dust removal and recovery operation of the dust remover 1 will be described with reference to FIG. The water flow WF causes debris GB such as jellyfish to adhere to the net screen 50 installed in the water intake channel 100. The dust remover 1 scrapes and removes this debris GB from the net screen 50, and then pulls it up to the ground AG for collection.

[0033] In the dust removal device 1, the pair of link chains 21A, 21B move in a circular motion as the rotating electric machine 27 is driven to rotate. As this circular motion occurs, the capturing means 10 rises along the net screen 50 in an upright position on the outgoing path 20O, and descends in an inverted position on the returning path 20R. When the capturing means 10 rises on the outgoing path 20O, the rake 13 preferably slides along the net screen 50, applying an upward force to the debris GB adhering to the net screen 50, thereby scraping the debris GB off the net screen 50. As the capturing means 10 rises, it collects the scraped debris GB in the bucket 11, continues to rise, and reaches the ground AG, where the first sprocket wheels 23A, 23B flip their position from upright to inverted.

[0034] When the bucket 11 assumes an inverted position and descends, the garbage GB contained in the bucket 11 falls freely and is collected into the collection container 30 waiting at the collection position P1. After receiving the garbage GB, the collection container 30 moves to the standby position P2, thereby allowing the bucket 11 to pass. When the collection container 30 receives the debris GB at collection position P1 from the preceding bucket 11 descending, it moves to standby position P2 and waits for the following bucket 11. When the preceding bucket 11 passes collection position P1, the bucket 11 moves from standby position P2 to collection position P1 to receive the debris GB from the following bucket 11, and then moves again to standby position P2.

[0035] [Effects of Dust Removal Device 1] [First effect] As described above, according to the dust remover 1, while the net screen 50 of the water intake channel 100 remains in place, the dust GB adhering to the net screen 50 can be scraped off by the rake 13 of the capturing means 10 rising along the outward path 20O and removed from the net screen 50. Therefore, according to the dust remover 1, it is possible to prevent the net screen 50 fixed at a predetermined position in the water intake channel 100 from becoming clogged with the dust GB, and the necessary water intake is ensured via the net screen 50 fixed at a predetermined position.

[0036] [Second effect] Next, according to the dust removal device 1, the dust GB that has been scraped off and removed by the rake 13 and captured can be transported to a collection site on the ground AG and collected in a collection container 30. Therefore, according to the dust removal device 1, the effort of collecting the dust GB can be saved.

[0037] [Third effect] Next, according to the dust remover 1, the plurality of capturing means 10 ascend on the outward path 20O at intervals to scrape off the dust GB, so the capturing means 10 pass one after the other at the same position in the second direction (Y) of the net screen 50. Therefore, according to the dust remover 1, the frequency with which the dust GB adheres to the net screen 50 can be reduced.

[0038] [Fourth effect] Next, according to the dust remover 1, the rake 13 and the guide 11D are inclined upward with respect to the catch box 11A, so that the dust GB scraped off the net screen 50 can be easily guided to the catch box 11A.

[0039] [Second embodiment: see Figs. 5 and 6] Next, a dust remover 2 according to a second embodiment will be described with reference to FIGS. The dust remover 1 can be said to continuously repeat the action of scraping and removing, while the dust remover 2 can be said to intermittently repeat the action of scraping and removing. Note that in the dust remover 2, the same elements as those in the dust remover 1 are given the same reference numerals and their explanation may be omitted.

[0040] The dust removal device 2 can intermittently collect the dust GB adhering to the net screen 50. The dust remover 2 includes a capturing means 10, a towing means 20B that can be towed, and a collection container 30 that receives the dust GB from the capturing means 10. The capturing means 10 and the collection container 30 have the same configuration as the capturing means 10 and the collection container 30 in the dust remover 1.

[0041] [Traction means 20B: see Figures 5 and 6] The towing means 20B supports the capturing means 10 at its distal end and tows the capturing means 10. To this end, the towing means 20B includes a pair of wire ropes 22A, 22B arranged along the second direction (Y), and a pair of winding wheels 28A, 28B around which the upper ends of the wire ropes 22A, 22B are wound. The pair of winding wheels 28A, 28B are rotatably supported at fixed positions on the ground AG and connected to both ends of a third rotating shaft 29. Therefore, the pair of winding wheels 28A, 28B rotate synchronously.

[0042] The traction means 20B includes a rotating electric machine 27 that rotates a third rotating shaft 29. For example, when the rotating electric machine 27 is driven to rotate, a pair of winding wheels 28A, 28B rotates forward via the third rotating shaft 29, and this rotational movement winds up the pair of wire ropes 22A, 22B.

[0043] The rotating electric machine 27 can rotate forward and backward. When winding up the wire ropes 22A and 22B, the rotating electric machine 27 rotates forward to move the capturing means 10 to the upper limit, and when lowering the capturing means 10, the rotating electric machine 27 rotates backward to unwind the wire ropes 22A and 22B from the winding wheels 28A and 28B.

[0044] [Dust removal and collection operation: see Figure 5] It is assumed that the water flow WF causes debris GB such as jellyfish to adhere to the net screen 50 installed in the water intake channel 100. The dust removal device 2 scrapes and removes this debris GB from the net screen 50, and then pulls it up to the ground AG for collection.

[0045] To start dust removal, as shown in Figure 5(a), the capturing means 10 is placed at a start position P3 near the bottom of the intake channel 100. At the start position P3, the rake 13 of the capturing means 10 (not shown) is pressed against the net screen 50. Once the capturing means 10 is positioned at the start position P3, the rotating electric machine 27 is rotated forward to lift the capturing means 10 to the end position P4 shown in FIG. 5(b). During this process, the rake 13 preferably slides along the net screen 50, applying an upward force to the debris GB adhering to the net screen 50, thereby scraping the debris GB from the net screen 50. As the capturing means 10 rises, it collects the scraped debris GB in the bucket 11 and continues to rise to the end position P4 on the ground AG. For example, as shown by the dashed line in FIG. 5(b), the bucket 11 can be tilted to release the captured debris GB toward the collection container 30, allowing the debris GB to be collected.

[0046] After the dust GB is released, the rotating electric machine 27 is rotated in the reverse direction to lower the capturing means 10 to the start position P3, and the subsequent dust removal and collection operation can be performed. The time interval between the release of the dust GB and the lowering of the capturing means 10 is arbitrary, and the capturing means 10 may be lowered immediately after the dust GB is released, or may be lowered after a predetermined time has passed since the dust GB was released. The collection container 30 moves back and forth in a straight line between the start position P3 and the end position P4.

[0047] [Effects of Dust Removal Device 2] In addition to being able to achieve the first, second and third effects of the dust removal device 1, the dust removal device 2 has a simpler structure than the dust removal device 1, and can reduce manufacturing costs.

[0048] In addition to the above, the configurations given in the above embodiments can be selected or changed as appropriate to other configurations without departing from the spirit of the present invention.

[0049] The dust removal device 1 and the dust removal device 2 can be installed not only in power plants, but also in factories and facilities that have intake channels for taking in water from the sea, rivers, lakes, etc., such as steel mills, petrochemical plants, oil refineries, desalination plants, gas / LNG terminals, and pumping stations.

[0050] Although an example of the trapping box 11A that is connected integrally in the third direction (Z) has been shown, the present invention is not limited to this example as long as it can trap the dust GB. For example, a trapping box that is smaller in dimension in the third direction (Z) than the trapping box 11A may also be used. [Explanation of symbols]

[0051] 1,2 Dust removal equipment 10 Capture means 11 Bucket 11A capture box 11B Capture chamber 11C aperture 11D Guide 13 Rake 20A traction means 20B Towing means 20O Outbound 20R Return 21A, 21B link chain 22A, 22B Wire rope 23A, 23B 1st sprocket wheel 24 First rotation axis 25A, 25B Second sprocket wheel 26 Second rotation axis 27 Rotating Electric Machine 28A, 28B Winding wheels 29 Third rotation axis 30 Collection container 50 Netscreen 100 Intake channel GB garbage WF water flow AG ground P1 collection position P2 Standby position P3 start position P4 end position

Claims

1. a capturing means provided facing the net screen and capable of being raised and lowered; and towing means for supporting the capturing means and raising and lowering the capturing means between water and land, The capturing means is a rake for removing dust adhering to the net screen; a bucket that captures the debris removed by the rake.

2. The traction means is The plurality of capturing means are moved in a circular movement in a vertical direction, thereby continuously raising and lowering the capturing means. The dust removal device according to claim 1.

3. The traction means is The capturing means is linearly reciprocated in the vertical direction, thereby intermittently raising and lowering the capturing means. The dust removal device according to claim 1.

4. The rake is The bucket is provided at an angle such that its tip faces upward relative to the bucket. The dust removal device according to claim 1.

5. On the ground, a collection container for receiving the debris from the bucket; The dust removal device according to claim 1.

6. A dust removal method for scraping off dust adhering to a net screen while raising a capturing means along the net screen, The capturing means is a rake for removing dust adhering to the net screen; a bucket for capturing the debris removed by the rake; A dust removal method, comprising: sliding the rake over the net screen while raising the capturing means along the net screen.

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