JP6958333B2 - Upstream screen for dust remover - Google Patents

Description

The present invention particularly relates to an upstream screen for a dust remover, which is installed on the upstream side of the dust remover in a water channel to prevent a decrease in the dust collecting ability of the dust remover.

Plant equipment such as power plants may be equipped with intake equipment to guide seawater and river water to secure cooling water. This water intake facility is also equipped with a dust remover and a bar screen for collecting and removing foreign substances such as dust mixed in the fluid.

FIG. 7 is a perspective view of the dust remover. As shown in the figure, the dust remover 1 includes a pair of left and right (also referred to as the width direction) link chains 2 provided so as to cross the water channel, and upper and lower sprocket wheels 3 for rotating the link chains 2 (upper sprocket wheels are not shown). ) And a screen 4 inclined at a predetermined angle or perpendicular to the water flow direction for each link of the link chain 2.

A bar screen is usually installed on the upstream side of the dust remover installed in the waterway. The bar screen can collect large-sized dust flowing into the waterway to prevent a decrease in the dust collection capacity of the downstream dust remover, or reduce the dust collection load. That is, most bar screens use drainboard-shaped bars to collect coarse-sized debris. Then, the collection load due to clogging of the wire mesh screen used in the dust removing device can be reduced, and the operating efficiency of the entire device can be improved. The dust collected by the bar screen is collected after lifting the screen body to the ground with a heavy machine, or collected to the ground using a rake / rake-shaped scraping device.

The dust removal equipment disclosed in Patent Document 1 is equipped with a dust removal device in which a pair of left and right perforated flat plates are provided in a screen frame and a gate upstream thereof, and the gate is opened halfway when a large amount of dust such as jellyfish flows in. , Dust is concentrated and collected in the center of the screen frame of the downstream dust remover. Then, the perforated flat plate prevents the dust in the central part from moving laterally to both sides and covering the entire screen to secure the flowing water passage area. As a result, even in an abnormal situation where a large amount of dust such as jellyfish is generated, it is possible to suppress an increase in the water level difference before and after the dust remover.

Japanese Patent No. 2805740

In recent years, the amount of jellyfish generated has been on the rise due to the effects of rising seawater temperatures near Japan. Especially in power plants that use seawater as cooling water, a large amount of jellyfish may flow in unevenly during the daytime in the summer when the power supply is tight, which may temporarily exceed the collection capacity of the dust remover. .. Generally, the screen used in the dust remover has a mesh shape and an opening size of about 10 mm. The jellyfish are collected by the screen of the dust remover and collected and removed by orbiting the screen. However, if a large amount of jellyfish enters the waterway within a short period of time, it will exceed the collection capacity of the dust remover and stay on the upstream side of the device. Then, the screen of the device cannot pass water, a large water level difference is generated between the upstream side and the downstream side of the device, and the device may be damaged by the water pressure. However, stopping or reducing the amount of water intake in order to reduce the difference in water level should be avoided as much as possible because it directly leads to a decrease in the amount of power generation in the case of power generation equipment.
Further, in the case of a jellyfish assault as described above, even with the equipment as in Patent Document 1, the perforated flat plates that prevent the lateral movement of the jellyfish captured at the central portion of the screen frame are overcome and both sides are overcome. It also covers the screen surface, which can result in blockage over the entire surface of the screen frame.

Therefore, in view of the above-mentioned problems of the prior art, the present invention presents the upstream side for the dust remover, which can suppress a sudden load on the dust remover and continue stable operation when a large amount of dust temporarily flows into the intake channel. To provide a screen.

As a first means for solving the above problems, the present invention provides an upstream screen for a dust remover installed on the upstream side of a dust remover for removing dust in a water channel.
Screens in which nets and openings are alternately arranged in a direction intersecting the water flow are provided in multiple stages along the water flow.
An object of the present invention is to provide an upstream screen for a dust removing device, wherein the opening on the upstream side and the net portion on the downstream side are arranged so as to face each other along a water flow.
According to the first means, a part of the water stream can be released at the opening to disperse the dust and flow it into the dust removing device. Therefore, even if a large amount of dust temporarily flows in, the dust removing device is not stopped, and emergency measures such as water intake restrictions can be avoided.

As a second means for solving the above-mentioned problems, the present invention presents the present invention in the first means, wherein the screen is
Upstream front screen and
Downstream rear screen and
An object of the present invention is to provide an upstream screen for a dust removing device, which comprises a frame for mounting the front screen and the rear screen at predetermined intervals along a water flow and tilting the water surface side toward the downstream side.
According to the second means, the front screen and the rear screen can be integrally attached to the frame, and the positioning of the installation can be easily performed.

As a third means for solving the above-mentioned problems, the present invention is characterized in that, in the second means, the frame is provided with an L-shaped guide on the side surface that slides a guide groove on a side wall of a water channel. To provide an upstream screen for the device.
According to the third means, maintenance and cleaning of dust can be easily performed on the ground by pulling up from the upper opening of the waterway with a crane or the like.

As a fourth means for solving the above-mentioned problems, in the second means or a third means subordinate to the second means, the net portion of the rear-stage screen is the front-stage screen. It is an object of the present invention to provide an upstream screen for a dust removing device, which is characterized in that the width dimension is larger than that of the opening.
According to the fourth means, it becomes easy to collect and dam the dust that has passed through the opening of the front screen, and it is possible to temporarily disperse a large amount of dust that flows in.

As a fifth means for solving the above-mentioned problems, in the second means or a third or fourth means subordinate to the second means, the net portion of the front stage side screen is the rear stage. An object of the present invention is to provide an upstream screen for a dust remover, which is characterized in that the total area of dust collection is larger than that of the net portion of the side screen.
According to the fifth means, the amount of dust collected and the amount of damming on the upstream screen can be made larger than that on the downstream side to make a difference, and a large amount of dust that temporarily flows in can be dispersed.

According to the present invention, when a large amount of dust temporarily flows into a water channel, a sudden load applied to the dust removing device can be dispersed and suppressed, and problems such as damage to the dust removing device can be avoided.

It is explanatory drawing of the upstream side screen for a dust remover of this invention. It is a BB arrow view of FIG. It is a CC arrow view of FIG. It is the AA arrow view of FIG. It is explanatory drawing at the time of lifting the upstream side screen for a dust remover. It is explanatory drawing of the operation of the upstream side screen for a dust remover of this invention. It is explanatory drawing of the dust remover.

An embodiment of the upstream screen for a dust remover of the present invention will be described in detail below with reference to the accompanying drawings.

[Upstream screen 10 for dust remover]
FIG. 1 is an explanatory view of an upstream screen for a dust remover of the present invention. FIG. 2 is a view taken along the line BB of FIG. FIG. 3 is a view taken along the line CC of FIG. FIG. 4 is a view taken along the line AA of FIG. As shown in the figure, the upstream screen 10 for a dust remover of the present invention is a net portion of the upstream screen 10 for a dust remover installed on the upstream side of the dust remover 1 for removing dust in the water channel 12 in a direction intersecting the water flow. Screens (front screen 20 and rear screen 30) are provided in multiple stages along the water flow so that the upstream opening 24 and the downstream net 32 face each other along the water flow. It is placed in.

In the plurality of screens of the present embodiment, the upstream front screen 20, the downstream rear screen 30, and the front and rear screens 20 and 30 are tilted at predetermined intervals along the water flow and the water surface side is tilted toward the downstream side. It is provided with a frame 40 to be attached.
The frame 40 is a metal skeleton having predetermined strength, corrosion resistance, rust prevention, and the like. The width and length of the frame 40 are set to be substantially the same as the width of the water channel, and L-shaped guides 42 are provided on the side surfaces along the longitudinal direction (see FIGS. 4 and 6). The L-shaped guide 42 is formed in a shape that fits in the guide groove 16 provided on the side wall 14 of the water channel 12. The guide groove 16 is installed so that the ground side is inclined to the downstream side by a predetermined angle from the bottom surface of the water channel 12 toward the ground. As a result, the dust collection area of the net portions 22 and 32 can be increased with respect to the dust and the like that relatively flow on the water surface side of the water channel 12.

Further, the thickness dimension of the frame 40 is the distance between the front stage and the rear stage side screens 20 and 30, and in the present embodiment, the jellyfish that have passed through the front stage side screen 20 are clogged into the rear stage side screen 30 in consideration of the sudden attack of the jellyfish. The length is set so that it flows without any problems.
A hanging bracket 44 is attached to the upper end of the frame 40. The hanging metal fitting 44 is a member that connects to a wire such as a crane, and is used when installing or lifting the frame 40.
The front screen 20 includes a net portion 22 and an opening portion 24. The net portion 22 is a metal drainboard-shaped bar continuously provided in the vertical direction from the bottom of the water channel 12 to the water surface. The opening 24 is a running water space (a gap through which dust is not collected) provided continuously in the vertical direction from the bottom of the water channel 12 to the water surface on one side or both sides of the net portion 22. In a specific configuration of the front screen 20, net portions 22 are attached to one of the main surfaces of the frame 40 at predetermined intervals (openings 24) along the longitudinal direction. Such net portions 22 and openings 24 are alternately arranged on the same plane orthogonal to the water flow direction. The front screen 22 shown in FIG. 2 is composed of four net portions 22 and three openings 24, and the net portions 22 at both ends are attached via the frame 40 so as to be in contact with the side wall 14 of the water channel 12 without a gap.

Similar to the front screen 20, the rear screen 30 has a net portion 32 and an opening 34 arranged alternately on the same plane orthogonal to the water flow direction. The specific configuration of the rear screen 30 is such that the back surface of the other main surface of the frame 40 (the back surface of the front screen 20) net portion 32 faces the opening 24 of the front screen 20, in other words, the opening 34 is the front stage. It is attached so as to face the net portion 22 of the side screen 20. The width dimension of the net portion 32 is set to be larger than the width dimension of the opening 24 of the front screen 20. As a result, the dust that has passed through the opening 24 of the front screen 20 can be easily collected and blocked by the net portion 32, and a large amount of dust that temporarily flows in can be dispersed.
In a screen having such a configuration, when viewed from the upstream side of the screen as shown in FIG. 4, the net portions 22 and 32 appear to be arranged over the entire width of the water channel 12, but the front and rear screens 20 and Since the space between the 30s is released with a space corresponding to the thickness dimension of the frame 40, water containing dust that has passed through the front screen 20 can flow in the lateral direction.
Further, the net portion 22 of the front screen 20 has a larger total area for collecting dust than the net portion 32 of the rear screen 30. That is, in this embodiment, the number of net units installed is large. As a result, the amount of dust collected and the amount of damming of the front screen 20 can be made larger than those of the downstream side to make a difference, and a large amount of dust that temporarily flows in can be dispersed.

FIG. 5 is an explanatory view when the upstream screen for the dust remover is lifted. When installing the upstream screen 10 for a dust remover of the present invention in a water channel, a wire such as a crane is connected to a hanging metal fitting 44 provided at the upper end of the frame 40, and the frame 40 is lifted from the ground to open the upper surface of the water channel 12. After aligning the L-shaped guide 42 from 18 so that the L-shaped guide 42 fits in the guide groove 16, the L-shaped guide 42 slides downward along the guide groove 16 and fixes the frame 40 in the water channel 12 by suspending the guide groove 16. (See Fig. 1).
On the other hand, at the time of maintenance / cleaning of the upstream screen 10 for the dust removing device, a wire such as a crane is connected to a hanging metal fitting 44 provided at the upper end of the frame 40, and the frame 40 is lifted from the water channel 12. At this time, water is sprinkled from the vicinity of the upper surface opening 18 of the water channel 12 from the back surface (downstream side) of the net portions 22 and 32 using a hose 50 to wash the collected dust and dispose of it in the water channel. This dust can be collected by a dust remover on the downstream side.
As described above, the upstream screen 10 for the dust remover of the present invention can be easily attached to and detached from the water channel 12 and has good maintainability.

[Action]
FIG. 6 is an explanatory diagram of the operation of the upstream screen for the dust remover of the present invention.
<No dust during normal operation>
When there is no dust in the running water, the running water passes through the net portions 22, 32 and the openings 24, 34 of either the front stage or the rear stage side screens 20, 30. At this time, no water level difference has occurred.

<When a small amount of dust attacks>
In the case of running water containing a small amount of dust, either of the net portions 22 and 32 of the front and rear screens 20 and 30 in which the net portions 22 and 32 are arranged over the entire width of the water channel 12 when viewed from the upstream side of the screen. A small amount of dust can be collected. In addition, there is almost no difference in water level.

<At the time of a large amount of dust attack>
In the case of running water containing a large amount of dust, a large amount of dust such as a jellyfish attack is collected by the net parts 22 and 32 of the upstream and downstream screens 20 and 30, in other words, the net parts 22 and 32 are blocked by the large amount of dust. Will be done. However, since running water containing dust that is not collected can pass through the openings 24 and 34 and the predetermined intervals between the front and rear screens 20 and 30, the water level difference does not exceed the predetermined difference. That is, a large amount of dust in the running water can be dispersed by the screen and flowed to the dust removing device on the downstream side. As a result, dust that exceeds the collection capacity of the dust remover does not flow at once, and normal stable operation work can be continued. In addition, large dust, such as large pieces of wood and floating matter, can be collected by the front screen 20, and jellyfish and the like are passed through the opening, so that clogging of the net portion can be suppressed.

<After the dust attack>
After the invasion of dust, the frame 40 is lifted from the upper surface opening 18 of the waterway by a crane or the like in order to clean the dust collected by the net portions 22 and 32. At this time, in the vicinity of the upper surface opening 18, water is sprinkled from the back surfaces of the net portions 22 and 32 with a hose 50 for cleaning, and the dust is discarded into the water channel. The discarded dust can be easily collected by the dust remover on the downstream side.
According to the upstream screen for the dust remover of the present invention, when a large amount of dust temporarily flows into the water channel, the sudden load applied to the dust remover can be dispersed and suppressed, and the dust remover is damaged. It is possible to avoid the trouble of.
The upstream screen for the dust remover of the present embodiment has been described as having a two-stage configuration of a front screen and a rear screen, but the opening on the upstream side and the net portion on the downstream side face each other along the water flow. In the case of the arrangement, the number of screens to be installed is not limited to this, and can be provided as 3 stages, 4 stages, and so on.

The present invention is particularly useful as an upstream screen for a dust remover of a dust remover provided with a rotary net frame for collecting dust in a water intake facility such as a plant.

1 ……… Dust remover, 2 ……… Link chain, 3 ……… Lower sprocket wheel, 4 ……… Screen,
10 ……… Upstream screen for dust remover, 12 ……… Waterway, 14 ……… Side wall, 16 ……… Guide groove, 18 ……… Top opening,
20 ……… Front screen, 22 ……… Net part, 24 ……… Opening,
30 ……… Rear screen, 32 ……… Net part, 34 ……… Opening,
40 ……… Frame, 42 ……… L-shaped guide, 44 ……… Hanging bracket,
50 ……… Hose.

Claims (5)

In the upstream screen for the dust remover installed on the upstream side of the dust remover that removes dust from the waterway
Screens in which nets and openings are alternately arranged in a direction intersecting the water flow are provided in multiple stages along the water flow.
An upstream screen for a dust remover, characterized in that the opening on the upstream side and the net portion on the downstream side are arranged so as to face each other along a water flow. The screen is
Upstream front screen and
Downstream rear screen and
The upstream screen for a dust remover according to claim 1, further comprising a frame for mounting the front and rear screens at predetermined intervals along a water flow and with the water surface side inclined to the downstream side. The upstream screen for a dust remover according to claim 2, wherein the frame is provided with an L-shaped guide that slides a guide groove on a side wall of a water channel on a side surface. The upstream screen for a dust remover according to claim 2, wherein the net portion of the rear screen has a width larger than that of the opening of the front screen. The third or four claim 2 is characterized in that the net portion of the front screen has a larger total area of dust collection than the net portion of the rear screen, or is dependent on claim 2. Upstream screen for dust remover.

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