JPH0321712A - Dust collector - Google Patents

Abstract

PURPOSE:To improve operating performance in an emergency by locating an ultrasonic transmitter-receiver or an optical sensor on the upstream side of a dust collector installed in a cooling water inlet channel, etc., and controlling the speed of a drive motor by signals therefrom. CONSTITUTION:An ultrasonic transmitter-receiver (sonar) 100 is installed on the upstream side of a screen frame 4 of a dust collector installed in a cooling water inlet channel in an electric power plant, etc., at a certain distance from the screen frame. A transducer 110, a comparator 120, a rotating speed setting device 130, an amplifier 140, and a controller 150 are installed between the sonar 100 and a variable speed motor 50 for driving the screen frame 4. An optical sensor can be used in place of the sonar 100. The quantity of dusts flowing into the water channel is before-hand detected, and when the quantity of dusts is large, the rotating speed of the motor 50 is increased to enlarge the travelling speed of the screen frame 4. The water level differential across the device can thus be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dust removal device for removing dust from seawater or river water, and particularly to a structure for minimizing the difference in water level before and after the dust removal device. [Prior Art] Conventionally, commonly used dust removal devices have been widely used in industrial water canals or waterways for taking cooling water in power plants, etc., and the most well-known type is A link chain is provided on both sides, and a screen or a screen made of wire mesh is installed perpendicularly or almost perpendicularly to the flow direction for each link of the link chain. There are structures that remove dust from the waterway. Figure 3,
Fig. 4 shows one embodiment of a conventional dust removal device, Fig. 3 is an overall schematic diagram, and Fig. 4 is a detailed longitudinal sectional view (a) and a detailed diagram (b) of a screen frame having a packet part. .

In FIG. 4, l is a two-part sprocket foil, 2 is a lower sprocket foil, 3 is a double sprocket foil, 1.
2 is a link chain mounted in an endless manner; 4 is a screen frame attached to the link chain 3 and has a bucket portion at the bottom for storing captured garbage; a variable speed electric motor that transmits power to the upper sprocket wheel 1; 8 is a shaft of the L sprocket wheel 1; 9 is a guide plate that guides dust to the trough 10;
11 indicates the housing of the dust removal device, 12 indicates the flow channel, and arrow F indicates the direction of the driftwood. As shown in FIG. 4, the frame body 4 is attached to each pitch of the link chain 3, and 14 is a screen body, which is made of a wire mesh or a large number of bars arranged in the shape of a plow.
In addition to preventing dust from entering the flowing water,
This is the part that will hold it up. Reference numeral 15 denotes an upper beam provided at the upper end of the screen main body 14. This upper beam 15 is made of a shaped steel such as a pipe or channel steel having a suitable diameter depending on the width of the waterway, and its center is located at the link chain. The screen main body 14 is integrally fixed via a mounting plate 16 which is provided so as to be located at the center of the roller 3b portion of the roller 3b and protrudes from the bottom of the mounting plate 16. Reference numeral 17 denotes a lower beam having a U-shaped cross section and provided at the lower end of the screen main body l4. The frame body l4 is integrally fixed via a mounting plate l8 which is provided so as to cover it and protrudes from the upper part thereof. Reference numeral 19 denotes a side plate that holds the frame l4 from its side, and this side plate 19 has a width wider than the link width of the link chain 3, as shown in FIG. 17
are integrally fixed to the left and right end faces of the In other words, the side plate 19, the upper beam 15, and the lower beam 17 form the frame 14. This frame body 4 has its side plate 19 connected to the link 3a by the port 20.
It is fixed to the link chain 3 by fixing it to the side of the link chain. Reference numeral 21 denotes a garbage bucket 7 protruding from the lower beam 17.
The garbage packet 21 is provided so as to diagonally cover the lower front part of the frame 14, and its left and right ends are integrally fixed to the side plate 19 via a support plate 22. Note that 23 is a spray pipe installed on the back of the descending screen 13, and is used to remove dust adhering to the frame 14 by spraying spray wood onto the back of the screen 13 as shown by the chain line. be. therefore,
The garbage floating in the flow is first blocked by the frame 14, and as the link chain 3 rises, it is scooped up by the garbage packet 21, and the garbage/hecket 21 containing the garbage further rises and reaches the upper sprocket. l
It becomes horizontal at the top, then turns around and descends.

Then, the garbage existing in the garbage packet 21 falls due to its gravity, is guided by the outer surface of the garbage bucket 21 of the lower screen and the guide plate 9, and is discharged into the trough 10. On the other hand, the dust adhering to the screen body 14 is removed by the spray water, and the dust on the lower screen and the outer surface of the heket 21 are discharged into the trough 10 via the id plate 9, as described above. The endless link chain 8 to which the frame body 4 constructed as described above is joined is usually driven by a seven-part sprocket wheel 1 having approximately six sections, as shown in FIG. In addition, L
The arrow indicates the link chain drive direction.

[Problem to be solved by the invention] In recent years, as the amount of water intake has increased, the width of waterways has become wider, and the amount of debris floating in waterways has tended to increase.
When a large amount of dust such as water matrix floods in, it exceeds the processing capacity of the installed dust removal equipment, and the dust cannot be processed completely. 1f! The water passage portion of the frame body, such as a single frame or a bar frame, gradually becomes blocked, and eventually it becomes impossible to ensure sufficient water passage, leading to a situation where the water level difference before and after the dust removal device rises suddenly.

For this reason, if the water level difference before and after the dust remover exceeds a certain value, the IL force of the running water applied to the frame such as the mesh frame or bar frame will overfire and cause structural damage to the device, so it is unavoidable. Measures were taken such as limiting the amount of water the factory could take.

However, if such a situation occurs during the electricity demand period,
At power plants, the supply of electricity could not keep up with the demand for electricity, resulting in power outages, a serious public emergency. [Means for Solving the Problems] The present invention solves the above-mentioned problems and temporarily prevents the VA of inflow of large amounts of dust such as water matrix (hereinafter referred to as "emergency"), before and after due to overload of dust removal equipment. In order to eliminate abnormal water level differences, a frame body equipped with a screen or bar for collecting dust is joined to an endless link chain, and the link chain is driven at variable speeds via a pair of upper and lower sprocket wheels. In the dust removal device, an ultrasonic transducer facing the waterway is disposed at a position separated from the frame upstream of the waterway, and between the ultrasonic transceiver and the variable speed electric motor for driving the sprocket wheel. , converter, comparator, speed setting device.
#1 The structure is equipped with an operation circuit consisting of a width switch and a controller. Further, in the second invention, an optical sensor consisting of an infrared emitter and an infrared receiver is used instead of the ultrasonic transducer. [Function] In the present invention, a sound sensor (ultrasonic receiver/transmitter) and a light sensor (
By using an infrared emitter and an infrared receiver), we can catch the influx of a large amount of water and garbage in advance, and remove the garbage in order to deal with it before a difference in standard before and after the dust removal equipment occurs due to the causes listed in L. Depending on the quantity, the number of four rotations of the sprocket/end wheel is increased in advance to prevent the occurrence of a water level difference. [Example] The following is a detailed explanation of an example of the wooden invention based on the drawings. explain.

Fig. 1 shows an overall system diagram showing an embodiment of the first invention of the present invention, and Fig. 2 shows a block diagram showing an embodiment of the second invention of the invention. In the figure, 100 is an ultrasonic receiver/transmitter (sonar). 11
0 is a converter, 120 is a comparator, 130 is a rotation speed setter, 140 is an amplifier, and 150 is a controller. The structure of the dust removal device body is exactly the same as that explained in Figs. 3 and 4, so the explanation will be omitted. The operation of the tree invention constructed as described above will be explained. Ultrasonic waves are transmitted continuously or intermittently (for example, 10 times/minute every 6 seconds) from the ultrasonic receiver/transmitter 100 toward the waterway, and when a large amount of water matrix or other debris flows into the waterway. Ultrasonic reflected waves (echoes) are received by the ultrasonic receiver/transmitter 100 faster than clear water. Transducer 1 converts this echo into
10, the degree of inflow of dust is determined by comparison 1120 based on the proportion of echoes due to intervening dust per projected area, and the turbidity of flowing water in the waterway (driftwood in the waterway) set in advance with the rotation speed setting device 130 is converted into an electric signal. An electrical signal is sent to the controller 150 via the amplifier 140 in accordance with the amount of dust contained in the motor, and the rotational speed of the variable speed electric motor 50 is increased. The variation rate of the rotation speed may be increased stepwise to 120%, 150%, 200% from the normal rotation speed of 100% depending on the turbidity, or it may be varied linearly in an analog manner. ．． By performing the above operations, once a large water level difference has occurred in the dust removal device, even if the rotation speed is increased afterwards, the running water in the waterway will be concentrated on the screen part of the frame that is not closed. This eliminates the drawback of the conventional method, which is that the water level difference cannot be easily resolved because the water flows into the water, and detects the onslaught of dust in advance and increases the rotation speed of the subrocket of the dust removal device to prevent the water level difference from occurring. can do. In the second invention, when infrared rays (or ultraviolet rays) are incident on flowing water, the intensity of transmitted light relative to the incident light changes depending on the turbidity of the flow.
(Lambert-Beer) (7) law, and has a configuration as shown in FIG. Since the speed is different, the rotation speed of the variable speed electric motor 50 is increased or decreased as described above according to this degree. Note that ultraviolet light may be used instead of infrared light.

In the present invention, signals from the sound sensor and optical sensor are directly sent to the variable speed motor, but in the middle of the drying circuit, the blood distribution status of the garbage in the waterway is monitored by image processing, and the degree of distribution is also evaluated. It is also possible to make a determination and send the signal to the variable speed motor.

[Effects of the Invention] With the above-described structure and action, the invention detects in advance that a large amount of dust has entered the flowing water in the waterway according to its degree, and increases or decreases the processing capacity of the dust removal device in advance. The water level difference before and after the device can be kept as small as possible. Therefore, the load on each component of the dust removal device can be reduced, and damage to the equipment can be prevented, improving safety. In addition, since the minimum necessary water intake can be secured even in an emergency, continuous and stable operation is possible, increasing the reliability of equipment use and improving equipment maintenance, management, and operational operability.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a second embodiment of the present invention.
Figures 3 and 4 show examples of conventional dust removal equipment;
The figure is an overall vertical sectional view, and Figure 4 is a partially enlarged view of the frame.
) is a side view, and (b) is a full view. l... Upper sprocket foil, 2...
・Lower sprocket wheel, 3...Link chain, 3a...Link 3b...Roller,
4...Screen frame, 5...Chain wheel,
6... Conduction chain, 7...
Chain wheel, l4...Screen body, 3
0...,<+,32...Exhaust port 34.
...Blank question, F ...Flow direction of water, L ...Driving direction of link chain, O.
...Variable speed electric motor, 00...Ultrasonic receiver/transmitter (sonar), 00a...Infrared emitter, oob...Infrared receiver, 10...Converter, 120...Comparison vessel, 30
...Rotation speed setting device, 40...Amplifier, 150...Controller.

Claims (2)

[Claims] (1) In a dust removal device in which a frame body equipped with a screen or bar for collecting dust is joined to an endless link chain, and the link chain is driven at variable speed via a pair of upper and lower sprocket wheels, the frame body is An ultrasonic receiver/transmitter facing the waterway is disposed at a position separated from the body upstream of the waterway, and a converter and a comparative A dust removal device characterized by comprising an operation circuit consisting of a speed setting device, a speed setting device, an amplifier, and a controller. (2) The dust removal device according to claim 1, wherein an infrared emitter and an infrared receiver are used in place of the ultrasonic transducer.