JP2021075912A - Dust collector and operation method of dust collector - Google Patents

Abstract

To provide a dust collector and an operation method of the dust collector capable of diagnosing a state of a spray cleaning a wire net attached on a screen and clog of the wire net.SOLUTION: The dust collector provide with a screen 4 subjected to be dipped and pulled out in/out of an inlet channel and cleaning means 12 removing dust attached on the screen 4 comprises: a pressure sensor 20 detecting hydraulic pressure of cleaning water in piping of the cleaning means 12 taking water from the inlet channel after the dust has been removed; a pressure-sensitive sensor 30 at a position which the washing water injected from a spray nozzle 18 of the washing means 12 hits, detecting hydraulic pressure when the injected washing water hits by arranging a space where the screen 4 vertically moves therebetween; and a determination section 40 determining clog of the spray nozzle 18 or the wire net of the screen 4 when one or more detected values of the pressure sensor 20 and the pressure-sensitive sensor 30 is abnormal.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dust remover and an operation method of the dust remover for removing foreign substances such as dust in water when water is taken from the sea or river or when water is purified.

In power plants such as thermal power plants, water intakes for use as cooling water from rivers and the sea are arranged. However, the water taken in may contain dust and aquatic organisms and cannot be used as it is. Therefore, a dust remover that works to capture underwater dust and aquatic organisms is installed at the water intake.
The dust remover is installed vertically or at an angle with respect to the water flow so as to cross the intake channel in the width direction, and in a power plant or the like with a large amount of water intake, the screen to which the wire mesh is attached is continuously rotated. A continuously rotating traveling screen that captures foreign matter such as dust and pulls it up onto the water is adopted.

FIG. 6 is an explanatory diagram of the dust remover. As shown in the figure, the dust remover 10a rotates a pair of left and right endless carrying chains 2 from a drive device via sprocket wheels on the top, bottom, left, and right, and a screen 4 having a wire mesh joined to the carrying chain 2 is an intake channel. It is installed so as to cross. The upper sprocket wheel (not shown) is installed in the housing 5 on the ground, and the lower sprocket wheel 3B is installed in the bottom of the waterway. In these pair of left and right upper and lower sprocket wheels, left and right sprocket wheels are installed so as to sandwich the intake channel, and rotation axes (head axis and tail axis) are provided so as to cross the water channel between the left and right sprocket wheels. ing.
In addition, as the power consumption of thermal power plants increases, more cooling water is required, so the dust remover must continuously capture dust. Especially in the summer when power consumption is high, its function becomes important, but in the summer, the amount of dust tends to increase because it coincides with the time when jellyfish occur. If the wire mesh attached to the screen rotates with dust remaining, the water flow rate is lowered, so that the dust removing function of the dust remover is lowered and a load is applied, which causes deterioration of parts. Therefore, the dust remover removes dust from the wire mesh attached to the screen in accordance with continuous operation. Specifically, in the housing 5 on the water where the upper sprocket wheel is stored, cleaning water was sprayed from the spray to clean the wire mesh from the back surface (when the surface that captures dust etc. is the front surface) and captured. Removes dust and the like.

In the technique disclosed in Patent Document 1 as an operation method of a conventional dust remover, water level gauges are installed on the upstream side and the downstream side of the device, and the water flow rate is lowered due to the difference in water level between the two water level gauges (dust amount). The pump of the washing water and the rotation speed motor are controlled by detecting whether or not dust or the like is attached to the screen by judging (increase).
However, according to Patent Document 1, it is possible to overlook the problem that dust and the like could not be removed because the spray cleaning did not function due to problems such as clogging of the spray nozzle. Here, clogging of the spray nozzle occurs when the cleaning water of the cleaning means is taken from the downstream side of the dust removing device, but fine dust that cannot be captured by the wire mesh of the screen is mixed in and the nozzle is clogged. If you overlook the problem caused by this spray nozzle, it is considered that the amount of dust trapped in the wire net is the cause, and the dust remover will be repeatedly operated unnecessarily continuously in order to eliminate the threshold of the water level difference. Since a large load is applied to the cleaning water pump and the rotary speed motor that make up the dust removing device, the dust removing device may be damaged or damaged. In such a situation, the operation of the dust remover must be stopped for repair and maintenance, which hinders the power supply of the power plant.
At present, the spray nozzles can be seen from the check door for inspecting the inside of the upper housing, but the clogging of multiple spray nozzles that clean the wire mesh of the screen can be visually observed from the appearance of the cleaning water being sprayed. It is difficult to judge. Therefore, there has been a demand for a method for diagnosing the condition of the spray nozzle.

Japanese Patent No. 4808112

The problem to be solved by the present invention is, in view of the above-mentioned problems of the prior art, a dust removing device and an operating method of the dust removing device capable of diagnosing the state of the spray for cleaning the wire mesh attached to the screen and the clogging of the wire mesh. Is to provide.

The present invention provides, as a first means for solving the above problems, a dust removing device including a screen in which immersion and pulling up in an intake channel are repeated, and a cleaning means for removing dust adhering to the screen.
A pressure sensor that detects the water pressure of the cleaning water in the piping of the cleaning means that takes in water from the intake channel after removing the dust, and a pressure sensor.
A pressure-sensitive sensor that detects the water pressure of the sprayed cleaning water by installing a space between the locations where the cleaning water sprayed from the spray nozzle of the cleaning means hits and the screen moves up and down. ,
When the detection value of any one or more of the pressure sensor and the pressure sensor is abnormal, the determination unit for determining that the spray nozzle is clogged or the wire mesh of the screen is clogged.
It is an object of the present invention to provide a dust removing device characterized by having.
According to the first means, it is possible to clearly determine from the two sensors whether the abnormality generated is the clogging of the spray nozzle or the clogging of the wire mesh of the screen.

According to the present invention, as a second means for solving the above-mentioned problems, in the first means, the cleaning means includes a spray pipe arranged so as to cross the intake channel on the back surface of a screen supplemented with dust. It has a plurality of spray nozzles that alternately spray the washing water in the vertical direction along the longitudinal direction of the spray pipe.
It is an object of the present invention to provide a dust removing device characterized in that a plurality of pressure-sensitive sensors are provided at each location where the spray nozzle hits.
According to the second means, when the spray nozzle is clogged, the position of the clogged spray nozzle can be easily specified, and the maintenance work can be performed in a short time and efficiently.

The present invention is characterized in that, as a third means for solving the above-mentioned problems, in the first or second means, the pressure-sensitive sensor uses an elastic member for the pressure-sensitive portion to which the washing water hits. To provide a dust remover.
According to the third means, since the portion of the inner wall surface of the housing that is exposed to the cleaning water is covered with an elastic member such as rubber, the impact noise of the cleaning water hitting the wall surface is reduced and the noise can be reduced.

In the present invention, as a fourth means for solving the above-mentioned problems, in any one of the first to third means, the detection value of the pressure-sensitive sensor is stored and the accumulated detection value is used. An object of the present invention is to provide a dust removing device having a guessing unit for estimating deterioration of the spray nozzle.
According to the fourth means, the position of the abnormal spray nozzle can be specified, and the deteriorated state of the nozzle can be estimated.

The present invention provides, as a fifth means for solving the above-mentioned problems, in an operation method of a dust removing device including a screen in which immersion and pulling up in an intake channel are repeated and a cleaning means for removing dust adhering to the screen.
A step of detecting the water pressure of the washing water in the piping of the washing means taking water from the intake channel after removing the dust, and a step of detecting the water pressure of the washing water.
A step of detecting the water pressure of the sprayed washing water by installing a space where the screen moves up and down at a place where the washing water sprayed from the spray nozzle of the washing means hits.
When the detected value of any one or more of the pressure sensor and the pressure sensor is abnormal, the step of determining that the spray nozzle is clogged or the wire mesh of the screen is clogged.
It is an object of the present invention to provide a method of operating a dust removing device, which comprises the above.
According to the fifth means, it is possible to clearly determine from the two sensors whether the abnormality generated is the clogging of the spray nozzle or the clogging of the wire mesh of the screen.

According to the present invention, as a sixth means for solving the above-mentioned problems, in the fifth means, a plurality of steps for detecting the water pressure of the sprayed washing water are detected at each location where the spray nozzle hits. It is an object of the present invention to provide a method of operating a dust removing device as a feature.
According to the sixth means, when the spray nozzle is clogged, the position of the clogged spray nozzle can be easily specified, and the maintenance work can be performed in a short time and efficiently.

According to the present invention, as a seventh means for solving the above-mentioned problems, in the fifth or sixth means, the detection value of the pressure-sensitive sensor is stored, and the accumulated detection value of the spray nozzle is used. It is an object of the present invention to provide a method of operating a dust removing device, which comprises a step of estimating deterioration.
According to the seventh means, the position of the abnormal spray nozzle can be specified, and the deteriorated state of the nozzle can be estimated.

According to the present invention, it is possible to clearly determine from the two sensors whether the abnormality generated is the clogging of the spray nozzle or the clogging of the wire mesh of the screen. Further, in the case of clogging of the spray nozzle, the position of the spray nozzle can be easily specified, and the maintenance work can be performed in a short time and efficiently.

It is a structural schematic diagram of the dust removal device of this invention. It is explanatory drawing of a spray pipe. It is explanatory drawing of a spray nozzle. It is explanatory drawing of the pressure sensitive sensor. It is a processing flow diagram of the operation method of the dust removal device of this invention. It is explanatory drawing of the dust remover.

An embodiment of the dust remover and the operation method of the dust remover of the present invention will be described in detail below with reference to the drawings.
[Dust remover 10]
FIG. 1 is a schematic configuration diagram of the dust remover of the present invention. As shown in the figure, the dust remover 10 of the present invention is a dust remover 10 including a screen 4 in which immersion and pulling up in an intake channel are repeated, and a cleaning means 12 for removing dust adhering to the screen 4, and removes dust. The pressure sensor 20 that detects the water pressure of the cleaning water in the piping of the cleaning means 12 that takes in water from the subsequent intake channel and the cleaning water sprayed from the spray nozzle 18 of the cleaning means 12 hit the screen 4 between them. The spray nozzle 18 or the spray nozzle 18 or when the detection values of the pressure sensor 20 and / and the pressure sensor 30 are abnormal, the pressure sensor 30 that detects the water pressure of the injected washing water is installed with a space for moving up and down. It has a determination unit 40 for determining that the wire mesh of the screen 4 is clogged.

(Cleaning means 12)
The cleaning means 12 has an intake pipe 13, an intake pump 14, a spray pipe 16, and a spray nozzle 18, and injects cleaning water taken from the downstream side of the apparatus onto the screen 4 for cleaning. The water intake pipe 13 is a pipe having one end connected to the intake channel on the downstream side of the apparatus from which dust has been removed by the screen 4 and the other end connected to the spray pipe 16.
FIG. 2 is an explanatory view of the spray pipe. FIG. 3 is an explanatory view of the spray nozzle.
The spray pipe 16 is installed below the axis of the upper sprocket wheel 3A in the longitudinal direction along the axis, passes through the upper sprocket wheel 3A, and faces the inner wall of the facing housing from the back surface of the inverted screen 4. It is configured to be able to supply wash water (see FIGS. 1 and 2).
A plurality of spray nozzles 18 are installed in the spray pipe 16 (see FIGS. 2 and 3). The spray nozzles 18 are arranged alternately (zigzag) along the longitudinal direction of the spray pipe 16 at equal intervals. The injection angles of the spray nozzles 18 are upward predetermined angles a ° and b ° (a> b) and downward predetermined angles c ° and d ° (c>) with respect to the horizontal plane s passing through the axis of the spray pipe 16. As d), they are repeatedly arranged in the order of d °, a °, c °, and b °. The cleaning water sprayed in such an arrangement of the spray nozzles 18 passes through the wire mesh of the screen 4 and hits the inner wall surface of the housing facing each other in the shape of two upper and lower broken points (see FIG. 4). According to such a cleaning means 12, it is possible to uniformly inject the cleaning water onto the wire net without overlapping.

(Pressure sensor 20)
The pressure sensor 20 is a sensor that detects the pressure of the cleaning water of the cleaning means 12. The pressure sensor 20 is attached to the intake pipe 13 between the intake pump 14 and the spray pipe 16 to detect the pressure of the washing water in the pipe. The pressure sensor 20 sets the pressure of the washing water in the intake pipe at the time of initial setting (when the water level is steady) as a set value. Then, when fine dust adheres to the spray nozzle 18, it becomes clogged. At this time, the detected value of the pressure sensor 20 becomes higher than the set value, and it can be determined that the spray nozzle 18 is clogged or the like.
The pressure of the washing water of the washing means 20 changes depending on the level of the water level in the intake channel. For example, using the steady water level as a reference value, the pressure also increases when the water level is higher than this reference value. Also, when the water level is lower than the standard value, the pressure is also low.
Therefore, the water level on the downstream side of the intake pipe (intake pump) of the intake channel is measured, and based on the water level data, when the water level is higher than the reference value, -xMPa is corrected, and when the water level is lower than the reference value. The correction of + xMPa is performed.

(Pressure sensor 30)
The pressure-sensitive sensor 30 uses a pressure-sensitive rubber sensor that is installed at a location where the cleaning water sprayed from the spray nozzle 18 hits the inner wall of the housing 5 and detects a load, that is, the pressure when the sprayed cleaning water hits. .. FIG. 4 is an explanatory diagram of the pressure sensitive sensor. As shown in the figure, one pressure sensor 30 is attached to each of the spray nozzles 18 at a location where the sprayed cleaning water hits the inner wall of the housing 5.
In the pressure sensor 30, the pressure of the washing water is high at the time of initial setting (steady state), and this value is set as the set value. Then, when the dust adhering to the wire mesh of the screen 4 cannot be removed by the washing water, it becomes clogged. At this time, the striking force of the washing water is weakened, the detected value of the pressure-sensitive sensor 30 becomes lower than the set value, and it can be determined that the wire mesh is clogged. During operation, the pressure sensitivity may be temporarily weakened by the frame of the screen 4, the captured dust, etc., but the sensing interval is widened so that such noise can be ignored.
Each pressure-sensitive sensor 30 is associated with a spray nozzle 18 that injects cleaning water at the time of installation, and records position information. Therefore, the position of the spray nozzle 18 can be specified from the pressure sensor 30 having a low detection value.

(Judgment unit 40)
The determination unit 40 is electrically connected to the pressure sensor 20 and the pressure sensor 30 so that the detection values of the respective sensors can be received, and the detection value of any one or more of the pressure sensor 20 and the pressure sensor 30 is abnormal. Occasionally, it is determined that the spray nozzle 18 or the screen 4 is clogged.
The specific determination method of the determination unit 40 is as follows.
(A) In the case of clogging of the spray nozzle 18, if the detection value of the pressure sensor 20 is higher than the set value, the nozzle is clogged with dust and the pressure of the washing water in the intake pipe is increased, so that the eyes of the spray nozzle 18 are clogged. Determine that clogging has occurred. At this time, since the amount of washing water injected from the spray nozzle 18 is weakened, the detected value of the pressure sensor 30 is also lower than the set value (see Table 1 (A)). From the detection result of the pressure sensor 30, the position of the clogged spray nozzle 18 can be specified.
(B) In the case of clogging of the wire mesh, the detection value of the pressure sensor 20 is normal, but if the detection value of the pressure sensor 30 is lower than the set value, dust that cannot be removed by the washing water adheres to the wire mesh and the mesh. It is determined that the wire mesh is clogged because the wire mesh is blocked (see Table 1 (B)). At this time, the position of which part of the wire mesh is clogged can be specified from the detection result of the pressure sensor 30. The clogging of the wire mesh may be caused not only by dust but also by the paint covering the wire mesh due to painting during maintenance of the screen frame, and this location can also be specified.
(C) The opposite of (B), that is, when the detection value of the pressure sensor 30 is normal but the detection value of the pressure sensor 20 is higher or lower than the set value, the water intake pipe, piping, or water intake pump It is determined that an abnormality in the intake pipe or piping, or a failure in the intake pump has occurred due to damage such as, deterioration over time, etc. (see Table 1 (C)).

(Guessing part 50)
The estimation unit 50 has a memory for accumulating the detected values of the pressure-sensitive sensor 30, and can estimate the aged deterioration of the spray nozzle 18 by using the accumulated detected values. Specifically, we have confirmed the secular change of the pressure that the sprayed washing water hits. If an abnormality in the detected value (higher or lower than the set value) is shown in the long term, the hole becomes smaller (higher than the set value) due to enlargement of the hole of the spray nozzle 18 (lower than the set value) or deposits. It is possible to estimate the deterioration of the nozzle.
The determination unit 40 and the estimation unit 50 are provided in a room away from the present device such as the operation control room of the power plant so that the detection values from the two sensors can be received to control diagnosis, management, and the like. You can also try to do. As a result, proper maintenance of the dust remover can be realized.

[How to operate the dust remover]
FIG. 5 is a processing flow chart of the operation method of the dust remover of the present invention.
The screen 4 is cleaned by the cleaning means 12 (step 1). Immersion of the screen 4 in the intake channel and pulling up from the intake channel are repeated, and cleaning water is sprayed by the cleaning means 12 to remove dust adhering to the screen 4.
At this time, the pressure sensor 20 senses the pressure of the washing water in the intake pipe 13. Further, the pressure sensor 30 senses the pressure when the washing water ejected from the spray nozzle 18 hits. The determination unit 40 that has received the detected value of the pressure sensor 20 compares the detected value with a predetermined set value (pressure of the washing water when the water level is steady), and determines whether or not the detected value is abnormal (step 2).
As a result, when the pressure sensor 20 shows a normal value (NO), the determination unit 40 which has received the detected value of the pressure sensor 30 further sets a predetermined set value (pressure of washing water in a steady state) and the detected value. Is compared, and it is determined whether or not the detected value is abnormal (step 3).
If the detected value of the pressure sensor 30 is not abnormal, the process returns to step 1 and the steps 1 and subsequent steps are repeated.
When the striking force of the washing water is weakened and the detection value of the pressure sensor 30 is lower than the set value (YES), dust that cannot be removed by the washing water adheres to the wire mesh and the mesh is blocked, so that the mesh of the wire mesh of the screen 4 is blocked. It is determined that the blockage ((B) above) is clogged (step 4).

On the other hand, when the detected value of the pressure sensor 20 is higher or lower than the set value (YES), the determination unit 40 that has received the detected value of the pressure sensor 30 has set a predetermined value (pressure of washing water in a steady state). And the detected value are compared with each other, and it is determined whether or not the detected value is abnormal (step 5).
When the detection value of the pressure sensor 30 is normal (the detection value of the pressure sensor 20 is abnormal), the intake pipe or piping, the intake pump 14 or the like is damaged, or the intake pump 14 is deteriorated over time. It is determined that a failure ((C) above) has occurred (step 6).
When the detected value of the pressure sensor 30 is low (YES), it is determined that the spray nozzle 18 is clogged ((A) above) (step 7). At this time, since the amount of washing water injected from the spray nozzle 18 is weakened, the detection value of the pressure sensor 30 is also lower than the set value. From the detection result of the pressure sensor 30, the position of the clogged spray nozzle 18 can be specified.
In the case of steps 4, 6 and 7, maintenance and water intake are stopped (step 8).
Further, the estimation unit 50 accumulates the detected values of the pressure-sensitive sensor, and estimates the aged deterioration of the spray nozzle 18 (expansion of holes, blockage of holes by deposits, etc.).

According to the present invention as described above, it is possible to clearly determine whether the generated abnormality is the clogging of the spray nozzle or the clogging of the wire mesh from the two sensors. Further, in the case of clogging of the spray nozzle, the position of the spray nozzle can be easily specified, and the maintenance work can be performed in a short time and efficiently.
Further, by using an elastic member (made of rubber) for the pressure-sensitive portion of the pressure-sensitive sensor arranged at a position where the jetted washing water hits the inner wall of the housing, the striking sound can be alleviated and the noise can be reduced.
The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, and can be implemented by various combinations.

2 Carrying chain 3A Upper sprocket wheel 3B Lower sprocket wheel 4 Screen 5 Housing 10, 10a Dust removal device 12 Cleaning means 13 Intake pipe 14 Intake pump 16 Spray pipe 18 Spray nozzle 20 Pressure sensor 30 Pressure sensor 40 Judgment unit 50 Estimator

Claims (7)

In a dust removing device provided with a screen in which immersion and pulling up in an intake channel are repeatedly performed and a cleaning means for removing dust adhering to the screen.
A pressure sensor that detects the water pressure of the cleaning water in the piping of the cleaning means that takes in water from the intake channel after removing the dust, and a pressure sensor.
A pressure-sensitive sensor that detects the water pressure of the sprayed cleaning water by installing a space between the locations where the cleaning water sprayed from the spray nozzle of the cleaning means hits and the screen moves up and down. ,
When the detection value of any one or more of the pressure sensor and the pressure sensor is abnormal, the determination unit for determining that the spray nozzle is clogged or the wire mesh of the screen is clogged.
A dust remover characterized by having. The dust remover according to claim 1.
The cleaning means includes a spray pipe arranged so as to cross the intake channel on the back surface of the screen that captures the dust, and a plurality of sprays that alternately spray the cleaning water in the vertical direction along the longitudinal direction of the spray pipe. Has a nozzle,
The pressure-sensitive sensor is a dust removing device, characterized in that a plurality of pressure-sensitive sensors are provided at each location where the spray nozzle hits. The dust removing device according to claim 1 or 2.
The pressure-sensitive sensor is a dust removing device characterized in that an elastic member is used for the pressure-sensitive portion that is exposed to the washing water. The dust removing device according to any one of claims 1 to 3.
A dust removing device comprising a estimation unit that stores the detected value of the pressure-sensitive sensor and estimates the deterioration of the spray nozzle by using the accumulated detected value. In the operation method of a dust removing device including a screen in which immersion and pulling up in an intake channel are repeatedly performed and a cleaning means for removing dust adhering to the screen.
A step of detecting the water pressure of the washing water in the piping of the washing means taking water from the intake channel after removing the dust, and a step of detecting the water pressure of the washing water.
A step of detecting the water pressure of the sprayed washing water by installing a space where the screen moves up and down at a place where the washing water sprayed from the spray nozzle of the washing means hits.
When the detected value of any one or more of the pressure sensor and the pressure sensor is abnormal, the step of determining that the spray nozzle is clogged or the wire mesh of the screen is clogged.
A method of operating a dust remover, which comprises. The method of operating the dust remover according to claim 5.
The step of detecting the water pressure of the sprayed washing water is a method of operating a dust removing device, which comprises detecting a plurality of steps at each location where the spray nozzle hits. The method of operating the dust remover according to claim 5 or 6.
A method for operating a dust removing device, which comprises a step of storing the detected value of the pressure-sensitive sensor and estimating the deterioration of the spray nozzle by using the accumulated detected value.

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