JP2805739B2 - Dust removal 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 dust removing device for removing dust from seawater or river water, and more particularly to a dust removing device for mitigating and improving a flow obstruction of a screen due to the attachment of dust to the screen.

[0002]

2. Description of the Related Art Conventionally, a dust removing device has been widely used in a water channel for taking cooling water such as an industrial water channel or a power plant. The most well-known type of dust remover is that a link chain is provided on both sides of the water channel, and a bar screen or a screen made of wire mesh is provided at each link of the link chain in a direction perpendicular to the water flow direction or at a predetermined inclination angle. And the screen is driven to rotate to remove dust adhering to the screen out of the water channel.

FIGS. 6 to 8 show examples of a conventional dust removing apparatus.
6 is an overall schematic view, FIG. 7 is a detailed sectional view of a screen frame having a bucket portion, and FIG. 8 is a front view.

[0004] As shown in the figure, the dust removing apparatus 100 has an upper sprocket wheel 1 installed at an upper portion of a water channel and a lower sprocket wheel 2 installed at a bottom of the water channel. It is mounted. The link chain 3 is provided with a screen frame 4 having a bucket portion for accommodating captured dust attached to a lower portion. The upper sprocket wheel 1 is rotated to move the screen frame 4 around, and a chain wheel 7 is connected via a transmission chain 6. Note that FIG.
Numeral 8 denotes a shaft of the upper sprocket wheel 1, 9 denotes a guide plate for guiding dust to the trough 10, 11 denotes a housing of the dust removing device, 12 denotes a flowing water channel, and an arrow F denotes a direction of flowing water.

As shown in FIG. 7, the screen frame 4 is attached at every pitch of the link chain 3, to which a screen body 14 composed of a plurality of bar members arranged in a wire mesh or plow shape is attached. Have been. The screen main body 14 is a member facing the running water and blocking the flow of dust and the like in the running water to collect the collected dust, and then scoops the collected dust upward by driving the link chain 3. An upper beam 15 is provided at the upper end of the screen main body 14, and the upper beam 15 is formed of a pipe having a diameter suitable for the width of the water channel.
The mounting plate 1 is set so that its center is located at the center of the roller 3b of the link chain 3, and protrudes below it.
6, the screen main body 14 is integrally fixed.

A lower beam 17 having a U-shaped cross section is provided at the lower end of the screen main body 14, and the lower beam 17 is rotatable above the upper beam 15 of the screen frame 4 adjacent to the lower portion. The screen main body 14 is integrally fixed via a mounting plate 18 provided so as to cover and protruding from the upper part thereof.

A side plate 19 for holding the side edge is provided at a side edge of the screen main body 14, and this side plate 19 has a width larger than the link width of the link chain 3 as shown in FIG. The upper beam 15 and the lower beam 17 are integrally fixed to left and right end surfaces, respectively. In other words, the side plate 19 and the upper beam 15 and the lower beam 17
Thus, a frame (screen frame 4) for holding the screen main body 14 is formed. Further, the side plate 19 extends to the bucket 21 described later and is joined to both ends of the bucket 21. The screen frame 4 is attached to the link chain 3 by fixing the side plate 19 to the side surface of the link 3a with bolts 20. A dust bucket 21 is provided on the lower beam 17 so as to obliquely cover the lower front of the screen main body 14, and the left and right ends thereof are integrally fixed to the projecting portion of the side plate 19. I have.

In FIG. 6, reference numeral 23 denotes a backwashing spray pipe disposed on the back side of the screen main body 14 which has been turned upside down through the upper sprocket wheel 1, and sprays spray water onto the back of the screen main body 14. By doing so, the attached dust is removed and removed.

According to such a dust removing device, the dust and the like floating in the flow are first blocked by the screen main body 14 and scooped up by the dust bucket 21 as the link chain 3 rises. Then, the ascending wheel 1 is turned upside down. As a result, the dust remaining in the dust bucket 21 falls and is discharged to the trough 10 via the inclined surface of the dust bucket 21 and the guide plate 9.

[0010]

By the way, in recent years, the width of a water channel has been widened with an increase in water intake, while the amount of dust floating in the water channel has tended to increase. In the case of flooding, the processing capacity of the installed dust remover is exceeded, the dust cannot be completely processed, and the screen main body 14 gradually closes, and eventually it becomes impossible to secure sufficient water flow. Caused a sudden rise in the water level difference. The processing capacity of the dust remover is determined by the volume of dust that can be scraped up by the volume of the screen body 14 and the dust bucket 21 and the operation speed thereof.
The actual situation is that, before reaching the capacity, an abnormal water level difference occurs on the screen due to water flow obstruction due to clogging of the screen, causing the screen to be inoperable.

For this reason, when the water level difference between before and after the dust remover exceeds a certain value, the flowing water pressure applied to the screen main body 14 and the screen frame 4 becomes excessively large. I was taking action. However, when such a situation occurs during the power demand period, there is a problem that the power supply at the power plant cannot keep up with the demand, and a power outage causes a serious public abnormal situation.

The present invention pays attention to the above-mentioned conventional problems, and can reduce the load on the dust removing device of the main body when a large amount of water is introduced and flow, minimize the difference in water level before and after the dust removing device, and continue safe operation. The purpose is to provide dust removal equipment.

[0013]

In order to achieve the above object, a dust removing apparatus according to the present invention comprises a dust removing device provided in a water channel and a pre-dust removing device provided upstream of the water channel of the dust removing device. The dust removing device comprises an endless link chain, a screen frame provided with a dust collecting screen, and an electric motor for driving the link chain through a pair of upper and lower sprocket wheels. The apparatus includes a perforated flat plate that crosses the waterway and a pair of left and right perforated flat plates and a perforated bottom plate connected at one end to an inner wall in front of the waterway and the other end to an intermediate portion of the perforated flat plate. It is arranged up and down freely.

[0014]

In the dust removing equipment of the present invention, when a large amount of dust such as a water carrier is generated and inflows, the dust is captured by the perforated flat plate of the pre-dust removing device installed in front of the water channel of the dust removing device, and the perforated flat plate crossing the water channel and the left and right. It is sequentially accumulated in a region surrounded by a pair of perforated flat plates. During this time, dust that is smaller than the water flow and the through-hole diameter of the perforated flat plate passes through the perforated flat plate on the upstream side of the accumulated debris and flows downstream to the dust removal device, where the debris is collected and removed from the water channel. You. Therefore, even in such abnormal situations, the load on the dust removal device is reduced,
The water level difference between upstream and downstream is kept within a certain limit. When the dust accumulated in the box is full, the box is lifted out of the water channel by a crane or crane truck installed outside the channel to remove the dust from the box.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dust removing apparatus according to an embodiment of the present invention. The dust removal equipment of the present invention
It is composed of a dust removal device 100 and a pre-dust removal device 200, and the pre-dust removal device 200 is disposed upstream of the water channel, and the dust removal device 100 is disposed downstream of the water channel. The dust removing device 100 is as described in the related art, and a description thereof will be omitted. 1 to 5 relate to an embodiment of the present invention, FIG. 1 is an overall plan view of a dust removing facility, FIG. 2 is an overall vertical sectional view of the dust removing facility, FIG.
4 is an explanatory diagram of a normal state and an abnormal state, and FIG. 5 is a schematic plan view showing various forms of the pre-dusting device 200. In the drawing, reference numeral 100 denotes a dust removing device, 200 denotes a pre-dust removing device, and a perforated flat plate 240 of the pre-dust removing device 200 is disposed so as to cross a water channel, and is disposed around a horizontal axis attached to side plates 220, 220 at both ends. Rotatable guide roller 22
Reference numerals 2 and 222 are disposed so as to abut the side surfaces of the column bases 210 and 210, respectively. On the other hand, a guide roller 252 attached to the edge of the perforated flat plate 240 is in contact with the side surface of the column base 230 provided on the inner wall of the water passage so as to be rollable, and the other end thereof is perforated. A pair of left and right perforated flat plates 250, 250 connected to the central portion of the slab are erected. The perforated flat plate 240 and a pair of left and right perforated flat plates 250 and 25
The 0 and the perforated bottom plate 260 form an integrated box 200A that is open only on the upstream side and the ceiling. And perforated plate 2
40 and the through-hole 250 of the perforated flat plate 250
a is larger than the size of the mesh of the screen 14 of the downstream dust remover 100, and usually has an opening diameter of about 2 to 5 times. Also, the perforated flat plate 240 is larger than the through hole 250a.
It is desirable to make the opening diameter of the through hole 240a at the center of the first portion somewhat smaller. Further, the perforated bottom plate 260 may be formed as a perforated flat plate, or may be provided with an opening and a wire mesh attached thereto. At the top of the edge of the box 200A is a hanging bracket 2
70 is mounted, and can be lifted and lowered by a crane device or a crane truck installed outside the waterway.

The operation of the dust removing equipment of the present invention configured as described above will be described. FIG. 3 shows a normal operation state in which the inflow of dust is relatively small. In this case, the dust A passes through the through holes 250a and 240a of the pre-dust removal device 200 and is collected by the dust removal device 100. On the other hand, when a large amount of refuse flows, that is, in the case of an abnormal condition, as shown in FIG.
Is difficult to pass through, and the dust is stopped by the perforated flat plate 240 and starts to accumulate. Such accumulated dust B gradually accumulates, and during this time, the dust A in the water stream and the water stream accumulates the accumulated dust B.
After passing through the through hole 250a of the perforated flat plate 250 on the more upstream side, the dust reaches the dust removal device 100 and is collected. As described above, the through holes 240a on both sides of the perforated flat plate 240 are holes for passing through, so that the through holes 2a at the center of the perforated flat plate 240 are formed.
It may be larger than 40a. Therefore, it is desirable that the through hole 240a at the center is the smallest, the through holes 240a on both sides are the smallest, and the through hole 250a has an intermediate size. Since the through holes and the wire mesh of the perforated bottom plate 260 are used for draining, the openings are somewhat finely opened.

The pre-dusting device of the present invention is basically
In the event of anomalies, trash is removed from three perforated plates 240, 250, 25
Since the water is to flow downstream while being captured and accumulated in the area surrounded by the zero and the perforated bottom plate 260, in addition to the perforated flat plate arrangement shown in FIG. 1, as shown in FIG. In
Almost isosceles triangular (Figure 5 (a)), perforated flat plate 2
50 is a bent portion having a portion parallel to the water channel and inclined (FIG. 5B), or a concave portion having a curved shape (FIG. 5B).
In any case, such as (c)), any storage area can be used as long as the storage area can be secured to some extent. Since a large amount of refuse is generated seasonally, and after that time, the amount of refuse returns to the normal refuse amount. At this point, it is necessary to lift the box from the channel to remove the refuse accumulated in the accumulation area. Is good. Also,
Conversely, it is desirable to set the length of the perforated flat plate 250 assuming the amount of dust accumulated in the accumulation area at this time.

[0018]

According to the dust removing equipment of the present invention, a pre-dust removing device is installed upstream of the dust removing device to accumulate dust when an abnormality occurs, so that an increase in water level difference before and after the dust removing device can be prevented. Therefore, stable and continuous operation is possible without causing damage to the equipment, and the maintainability is improved. Also,
The dust accumulated on the box can be easily removed from the water channel by the crane device or the crane truck, so that the work of removing the dust is easy.

[Brief description of the drawings]

FIG. 1 is an overall plan view of a dust removal facility showing an embodiment of the present invention.

FIG. 2 is an overall vertical sectional view of a dust removing facility showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a normal operation state of the present invention.

FIG. 4 is an explanatory diagram of an operation state at the time of abnormality according to the present invention.

FIG. 5 is a schematic plan view of the pre-dust device of the present invention.

FIG. 6 is an overall vertical sectional view of a conventional dust removing device.

FIG. 7 is a longitudinal sectional view of a main part of a conventional dust removing device.

FIG. 8 is a front view of a conventional dust removing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper sprocket wheel 2 Lower sprocket wheel 4 Screen 12 Waterway 14 Screen frame 15 Upper beam 17 Lower beam 19 Side plate 19a Through hole 100 Dust remover 200 Pre-dust remover 200A Box 210 Column base 220 Side plate 222 Guide roller 230 Column base 240 Hole Flat plate 240a Through hole 250 Perforated flat plate 250a Through hole 252 Guide roller 260 Perforated bottom plate 270 Hanging bracket 300 Crane device A Dust B Dust F Direction of flowing water

Claims (1)

(57) [Claims] 1. A dust removing apparatus comprising a dust removing device provided in a water channel and a pre-dust removing device installed upstream of the water channel of the dust removing device, wherein the dust removing device is provided with an endless link chain for collecting dust. A screen frame having a screen is joined, and an electric motor for driving the link chain through a pair of upper and lower sprocket wheels is provided. The pre-dusting device has a perforated flat plate crossing the water channel and one end connected to the inner wall in front of the water channel. Dust removal equipment comprising a box formed of a pair of left and right perforated flat plates and a perforated bottom plate whose ends are connected to an intermediate portion of the perforated flat plate so as to be vertically movable up and down a water channel.