JP7089221B2 - Dust remover - Google Patents

Description

The present invention relates to a dust removing device provided with a rotary net frame for collecting dust and the like from the intake channel of cooling water used in a power plant such as a thermal power plant.

At industrial water use destinations of plant equipment such as power plants, dust removers are installed in waterways for taking in cooling water and industrial water. This dust remover functions to remove foreign substances such as dullness and dust that flow into the intakes of the sea, rivers, and ponds. In a simple dust remover, a screen or wire mesh is installed in a direction perpendicular to the water flow direction or at an inclination of a predetermined angle. In addition, power plants with a large amount of water intake adopt a structure that can remove dust without clogging the screen by rotating the screen of the rotary net frame around and continuously entwining and catching dust.

FIG. 5 is a perspective view of a conventional 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) carrying chains 2 provided so as to cross the water channel, and upper and lower sprocket wheels 3B (the upper sprocket wheels are not shown) for rotating the carrying chains 2. ) And a net frame 4 having a screen inclined at a predetermined angle or perpendicular to the water flow direction for each link of the carrying chain 2.

Here, in many general dust removers, when dust or the like is pressed against the screen or wire mesh by running water pressure, the screen or wire mesh is clogged with dust or the like, which reduces the water passage area and reduces the dust collection capacity. There was a problem. Therefore, dust and the like are removed by pressurizing the washing water and spraying it on the screen or wire mesh.
In addition, dust and the like spread over the entire width with respect to the width of the waterway, and may be unevenly accumulated on the screen or wire mesh depending on the flow velocity, the type and amount of dust. For example, the central part of the waterway is a place where dust and the like are likely to collect because the flow of water is fast.
However, since the spray nozzles of the same size are installed at equal intervals and the spray is sprayed at a constant pressure, the cleaning effect varies depending on the uneven amount of accumulated dust. Such poor cleaning has reduced the dust collection capacity of the dust remover.

In the dustproof equipment disclosed in Patent Document 1, a plurality of vertically movable weirs are continuously arranged diagonally to the left and right in the downstream direction from the center of the waterway with respect to the waterway, and a screen for collecting dust is placed close to the front of the vertically movable weir. And are arranged. With such a configuration, the water channel is partially closed, the flow direction in the vicinity of the screen is changed, and the middle and lower layers of the water channel are flown down to remove the dust trapped by the screen and flow in the direction of the water flow.

However, when the dust captured by the screen is flushed, the flow of water is stopped by the movable weir, and the screen is continuously clogged until the movable weir is operated, resulting in large fluctuations in the amount of water intake and stability. do not do. In addition, it takes a long time to remove dust and the water intake efficiency is poor.

Jikkenhei 11-131450 Gazette

In view of the above-mentioned problems of the prior art, the present invention is to provide a dust removing device capable of preventing a decrease in dust removing ability for a long period of time. Further, the present invention is to provide a dust removing device capable of realizing efficient screen cleaning.

In the present invention, as a first means for solving the above problems, a dust removing device in which a net frame provided with a dust collecting screen is joined to an endless carrying chain and the carrying chain is driven by upper and lower sprocket wheels. In
The dust collection screen is arranged near the center in the width direction of the waterway with the longitudinal direction in the horizontal direction at predetermined intervals, and has a slit portion in which the collection surface is projected toward the upstream side.
It is an object of the present invention to provide a dust removing device characterized in that a mesh portion for collecting dust is provided at both ends of the dust collecting screen with the slit portion sandwiched between them.
According to the first means, dust is less likely to collect in the center of the screen, a sufficient water flow passage can be secured, and the load and friction on the dust removing device can be reduced.
In addition, the screen protruding to the upstream side increases the water flow area, and the processing capacity of the entire device can be improved.
In addition, the ability to collect dust is enhanced, and it can be easily washed and disposed of from both ends of the screen (both ends of the waterway).

According to the present invention, as a third means for solving the above-mentioned problems, in the first or second means, the slit portion has a wedge shape or an airfoil whose cross-sectional shape is tapered from the upstream side to the downstream side. It is an object of the present invention to provide a dust removing device characterized by being formed in.
According to the third means, the water flow resistance of the screen to the water flow can be reduced. In addition, dust and the like that are in contact with the surface on the upstream side can be easily flowed to the end side of the water channel, and the opening area on the back surface on the downstream side is large (compared to the surface on the upstream side) to secure a water flow passage and improve the water intake capacity. can.

The present invention provides, as a fourth means for solving the above-mentioned problems, a cleaning means for cleaning dust collected by the dust collection screen in any one of the first to third means.
The cleaning means is to provide a dust removing device characterized in that the cleaning water amount and / or the water pressure of the mesh portion is higher than that of the slit portion.
According to the fourth means, the amount of washing water in the central part of the screen can be reduced. It is also possible to reduce or delete the number of cleaning nozzles installed in the center of the screen.

According to the present invention, since the dust in the center of the screen is slid to both ends of the water channel by the water flow and collected, clogging in the center of the screen can be reduced and a sufficient water passage area is secured. The processing capacity of the entire device can be improved, and the dust removal capacity can be prevented from deteriorating. In addition, efficient screen cleaning can be realized.

It is a top view of the screen for collecting dust. It is a perspective view of the screen for collecting dust. It is a cross-sectional perspective view which enlarged a part of the slit part. It is explanatory drawing of the cleaning means. It is a perspective view of a dust remover.

The dust remover of the present invention will be described in detail below with reference to the accompanying drawings.
[Dust remover]
FIG. 1 is a plan view of a screen for collecting dust. FIG. 2 is a perspective view of a dust collecting screen (left half seen from the upstream side). FIG. 3 is an enlarged cross-sectional perspective view of a part of the slit portion. As shown in the figure, the dust collecting screen 10 of the dust removing device of the present invention includes a slit portion 20 and a mesh portion 30.

[Slit portion 20]
A plurality of slit portions 20 are provided by arranging a plurality of the longitudinal directions of the bars in the vertical direction along the horizontal direction. Each bar is provided at a predetermined interval (in the vertical direction).
The slit portion 20 is formed in a convex shape (mountain shape) in a plan view by projecting the center to the upstream side near the center of the dust collecting screen and making an angle symmetrically to the left and right (FIGS. 1 and 2). reference).
Further, the slit portion 20 is formed in a wedge shape (inverted triangular shape) or an airfoil (cross-sectional shape of the wing) in which the cross-sectional shape tapers from the front surface on the upstream side to the back surface on the downstream side (see FIG. 3). ..
As an example, a wedge wire screen or a slit type screen plate can be applied to such a slit portion 20.
Due to the action of the shape of the slit portion, dust is less likely to get entangled with the bar of the slit portion 20, and the water flow resistance can be reduced. In addition, dust and the like that are in contact with the surface on the upstream side can be easily flowed to the end side of the water channel, and the opening area on the back surface on the downstream side is large (compared to the surface on the upstream side) to secure a water flow passage and improve the water intake capacity. can.

[Mesh portion 30]
The mesh portions 30 are provided at both ends of the dust collecting screen 10. As an example, the mesh portion 30 can be applied with a flat net that can secure a wider water passage area than the slit type screen plate, and the main surface is arranged perpendicular to the water flow direction.
With such a configuration, dust from the entire screen can be collected by the mesh portions 30 at both ends.
In addition to the flat net, the mesh portion 30 may be fitted with a screen of the same type as the slit portion 20.

[Washing means 40]
FIG. 4 is an explanatory diagram of the cleaning means. The cleaning means 40 pressurizes and sprays cleaning water from the inside of the casing of the dust removing device (the back surface of the dust collecting screen 10) toward the screen.
As described above, dust is unevenly accumulated on the screen or wire mesh depending on the flow velocity, the type and amount of dust. Therefore, the amount of washing water and the water pressure are adjusted according to the position of the screen. This adjustment method can be realized by changing the size, number, etc. of the injection nozzles. In this embodiment, the amount of dust at both ends is larger than that near the center of the screen. Therefore, the number of spray nozzles installed in the slit portion 20 (near the center of the screen) is reduced or deleted, and both ends are set to the normal number of installations (similar to the conventional one).
The specific configuration of the cleaning means 40 is such that a predetermined interval is provided along the longitudinal direction of the dust collecting screen 10, and the cleaning water amount and / or water pressure of the mesh portion 30 is set higher than that of the slit portion 20. .. As a result, the number of injection nozzles installed in the entire device can be reduced, and the amount of water sprayed can also be reduced.

[Action]
The operation of the dust remover of the present invention according to the above configuration will be described below.
In the dust collecting screen 10 of the present invention, a slit portion 20 protruding upstream is provided in the center of the screen, and mesh portions 30 are provided at both ends of the screen so as to sandwich the slit portion 20. When the dust comes into contact with the slit portion 20 due to the water flow, it slides on the surface and is flown toward the mesh portions 30 at both ends and can be accumulated. The cleaning means 40 sets the amount of water sprinkled on the mesh portions 30 at both ends and / and the water pressure higher than that of the slit portion 20, and can efficiently separate (drop) dust from the mesh portions 30.

According to such a dust remover of the present invention, the dust in the center of the screen is slid to both ends of the water channel by the water flow to collect the dust, so that clogging in the center of the screen can be reduced and sufficient water flow can be performed. It is possible to secure an area, improve the processing capacity of the entire device, and prevent a decrease in dust removal capacity. In addition, the screen installation structure can control the flow of dust, and dust can be collected at both ends in the width direction of the waterway. Therefore, it is possible to secure a sufficient water passage area for the cooling water, improve the cleaning efficiency of the screen, and reduce clogging.

INDUSTRIAL APPLICABILITY The present invention is particularly useful as a dust removing device provided with a rotary net frame for collecting dust in a water intake facility such as a plant.

1 Dust remover 2 Carrying chain 3B Lower sprocket wheel 4 Net frame 10 Dust collection screen 20 Slit part 30 Mesh part 40 Cleaning means

Claims (3)

In a dust remover in which a net frame equipped with a dust collecting screen is joined to an endless carrying chain and the carrying chain is driven by upper and lower sprocket wheels.
The dust collection screen is arranged near the center in the width direction of the waterway with the longitudinal direction in the horizontal direction at predetermined intervals, and has a slit portion in which the collection surface is projected toward the upstream side.
A dust removing device characterized in that a mesh portion for collecting dust is provided at both ends of the dust collecting screen with the slit portion sandwiched between them . In the dust removing device according to claim 1 ,
The slit portion is a dust removing device characterized in that the cross-sectional shape is formed in a wedge shape or an airfoil shape that tapers from the upstream side to the downstream side. In the dust removing device according to claim 1 or 2 .
A cleaning means for cleaning the dust collected by the dust collection screen is provided.
The cleaning means is a dust removing device characterized in that the cleaning water amount and / or the water pressure of the mesh portion is higher than that of the slit portion.

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