Control device for wash water pump bearing lubrication water of dust device and control method therefor

Abstract

To provide a control device for wash water pump bearing lubrication water of a dust device and a control method therefor capable of keeping continuous operation of a device without stopping a wash water pump even when water pressure of bearing lubrication water of the wash water pump decreases.SOLUTION: A control device for wash water pump bearing lubrication water of a dust device is provided with: a screen repeatedly immersed in and lifted up from a water inlet channel; a pressure sensor measuring water pressure in a supply pipe of bearing lubrication water supplied to a bearing of a wash water pump of wash means for removing dust of the dust device provided with the wash means; a flow rate sensor measuring a flow rate of bearing lubrication water of the supply pipe; a flow rate adjustment valve attached on the supply pipe or a drain pipe between the pressure sensor and the flow rate sensor and the bearing to allow adjustment of its opening; and a control section electrically connecting the pressure sensor, the flow rate sensor, and the flow rate adjustment valve, to control continuous operation of the dust device while keeping a measured value of the pressure sensor equal to or higher than the lower limit of normal pressure by throttling the opening of the flow rate adjustment valve when the measured value does not satisfy the lower limit of the normal pressure of the wash water pump.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a control device and a control method for lubricating water for bearings of a cleaning water pump for a dust removal device that removes foreign matter such as dust from water when taking water from the sea or river or when purifying the water. [Background technology]

[0002] In power plants such as thermal power plants, water intakes are installed to use water from rivers and oceans as cooling water. However, the water taken in can contain dust and aquatic organisms, and cannot be used as is. For this reason, dust removal equipment is installed at the water intake to capture dust and aquatic organisms in the water. The dust removal equipment is installed perpendicular or at an angle to the water flow so as to cross the width of the intake channel. In power plants and other facilities with large water intake volumes, a rotary screen is used, which has a wire mesh screen that rotates to continuously capture dust and other foreign objects and pull them above the water.

[0003] Rotating the screen with dust remaining on the wire mesh attached to it reduces the water permeability and dust removal function, and also puts a load on it, which leads to deterioration of the parts. Therefore, the dust collector forcibly removes dust from the wire mesh attached to the screen in accordance with continuous operation. Specifically, in a water-surface housing that houses the upper sprocket wheel, cleaning water is sprayed from a cleaning nozzle onto the back of the wire mesh (when the surface that captures dust is considered the front) to wash and remove the trapped dust, etc. (see, for example, Patent Document 1).

[0004] This cleaning water is supplied to the cleaning means from the cleaning water pump. Figure 4 is an explanatory diagram of a conventional cleaning water pump. The cleaning water pump 5 is connected to a motor unit 7 via a bearing 6, and pumps up water from the water intake channel after dust collection and supplies it to the cleaning means as cleaning water. The bearing 6 requires bearing lubricating water to lubricate and cool its operation, and a supply pipe 6a and a drain pipe 6b for the bearing lubricating water are provided to the bearing 6. Conventional bearing lubricating water may use industrial water from the on-site facility depending on the specifications. Industrial water is often shared with other equipment in the on-site facility, and the supply is unstable. If the pressure (main pressure) of the bearing lubricating water supplied to the cleaning water pump 5 is insufficient, problems such as seizure of the bearing 6 will occur. Therefore, a pressure sensor 8 is installed in the supply pipe 6a for the bearing lubricating water to measure the water pressure, and if the normal pressure of the cleaning water pump 5 (the pressure at which the pump can operate steadily, which varies depending on the pump specifications and specifications) of the cleaning water pump 5 is not reached, the cleaning water pump 5 is stopped until the water pressure is restored to avoid problems with the bearing 6. If the wash water pump 5 is stopped, wash water will no longer be supplied to the wire mesh, the dust removal function will decrease, and continuous operation of the dust removal device will no longer be possible. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2021-181743 A Summary of the Invention [Problem to be solved by the invention]

[0006] In consideration of the problems of the prior art described above, the problem to be solved by the present invention is to provide a cleaning water pump bearing lubricating water control device for a dust removal device, and a control method thereof, which maintains continuous operation of the device without stopping the cleaning water pump even if the water pressure of the cleaning water pump's bearing lubricating water drops. [Means for solving the problem]

[0007] As a first means for solving the above problems, the present invention provides a dust removal device equipped with a screen that is repeatedly immersed in and pulled out of a water intake channel and a cleaning means for removing dust adhering to the screen, the dust removal device comprising: a pressure sensor for measuring the water pressure of a supply pipe of bearing lubricating water that is supplied to bearings of a cleaning water pump of the cleaning means; a flow rate sensor for measuring a flow rate of the bearing lubricating water in the supply pipe; a flow rate control valve that is attached to the supply pipe or the drain pipe between the pressure sensor and the flow rate sensor and the bearing and has an adjustable opening degree; The object of the present invention is to provide a control unit for controlling lubrication water for a bearing of a cleaning water pump of a dust removal apparatus, which is characterized by being electrically connected to the pressure sensor, the flow rate sensor, and the flow rate adjustment valve, and which, when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump, reduces the opening of the flow rate adjustment valve to maintain the normal pressure at or above the lower limit, thereby continuing the operation of the dust removal apparatus. According to the first means, even if the water pressure of the bearing lubricating water of the wash water pump drops, the water pressure can be restored to the normal pressure of the wash water pump to avoid the pump stopping, and therefore the continuous operation of the dust removal device can be maintained.

[0008] As a second means for solving the above problem, the present invention provides a cleaning water pump bearing lubricating water control device for a dust removal device, which is characterized in that in the first means, the control unit is electrically connected to the motor unit of the cleaning water pump, and performs control to reduce the discharge volume of the cleaning water pump when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump. According to the second means, the load on the bearings is reduced and a small amount of wash water can be supplied to the washing means without stopping the operation of the wash water pump, so that the dust remover can be operated continuously.

[0009] As a third means for solving the above problems, the present invention provides a cleaning water pump bearing lubricating water control device for a dust removal device, characterized in that in the second means, the control unit is electrically connected to a motor unit of the screen, and performs control to decelerate the rotational speed of the screen when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump. According to the third means, it is possible to prevent the screen from being submerged in water without removing the dust adhering to the screen, and the dust from flowing to the water intake side. Therefore, the dust removal device can be operated continuously without stopping.

[0010] As a fourth means for solving the above problems, the present invention provides a dust removal device including a screen that is repeatedly immersed in and pulled out of a water intake channel and a cleaning means for removing dust adhering to the screen, the dust removal device comprising: a step of measuring, with a pressure sensor, the water pressure in a supply pipe of bearing lubricating water that is supplied to bearings of a cleaning water pump of the cleaning means; and measuring, with a flow rate sensor, the flow rate of the bearing lubricating water in the supply pipe. The object of the present invention is to provide a method for controlling lubricating water for a cleaning water pump bearing of a dust removal device, comprising the step of controlling, when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump, to reduce the opening of a flow control valve installed on the supply pipe or drain pipe between the pressure sensor and the flow sensor and the bearing, thereby maintaining the normal pressure above the lower limit and continuing operation of the dust removal device. According to the fourth aspect, even if the water pressure of the bearing lubricating water for the wash water pump drops, the water pressure can be restored to the normal pressure of the wash water pump to prevent the pump from stopping, thereby maintaining continuous operation of the dust removal device.

[0011] As a fifth means for solving the above problems, the present invention provides a cleaning water pump bearing lubricating water control device for a dust removal device, which is characterized in that, in the fourth means, it further comprises a step of performing control to reduce the discharge volume of the cleaning water pump when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump. According to the fifth means, the load on the bearings can be reduced and a small amount of wash water can be supplied to the wash means without stopping the operation of the wash water pump, allowing the dust remover to continue operating.

[0012] As a sixth means for solving the above-mentioned problems, the present invention provides a method for controlling lubricating water for a washing water pump bearing of a dust removal device, which is characterized in that, in the fifth means, it further comprises a step of performing control to decelerate the rotational speed of the screen when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the washing water pump. According to the sixth aspect, it is possible to prevent the screen from being submerged in water without removing the dust adhering to the screen, and to prevent the dust from flowing to the water intake side. Therefore, the dust removal device can be operated continuously without stopping.

[0013] As a seventh means for solving the above-mentioned problems, the present invention provides a method for controlling lubricating water for a cleaning water pump bearing of a dust removal device, characterized in that, in any one of the fourth to sixth means, the control process is performed by remote operation at a location away from the dust removal device. According to the seventh aspect, the dust remover can be monitored and controlled from a remote location. Effect of the Invention

[0014] According to the present invention, even if the water pressure of the bearing lubricating water for the wash water pump drops, the water pressure can be restored to the normal pressure of the wash water pump to prevent the pump from stopping, and therefore the continuous operation of the dust removal device can be maintained. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing the configuration of a cleaning water pump bearing lubricant water control device of a dust removal apparatus according to the present invention. [Diagram 2] FIG. 2 is a flow chart of a method for controlling lubricating water for a bearing of a cleaning water pump of a dust removal device according to the present invention. [Diagram 3] FIG. 4 is an explanatory diagram of operation control by a control unit. [Figure 4] FIG. 1 is an explanatory diagram of a conventional flush water pump. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lubricating water control device for a wash water pump bearing of a dust remover and a control method thereof will be described in detail below with reference to the drawings.

[0017] [Dust removal equipment cleaning water pump bearing lubricating water control device 10] FIG. 1 is a schematic diagram showing the configuration of a cleaning water pump bearing lubricating water control device for a dust remover according to the present invention. The dust removal device 1 to which this device is to be installed is a rotary screen equipped with a screen 2 (for convenience, only one screen is shown in Figure 1) that is repeatedly immersed in and pulled out of the water intake channel, and a cleaning means 3 that removes dust and debris adhering to the screen 2.

[0018] The cleaning water pump bearing lubricating water control device 10 of the dust remover of the present invention is equipped with a screen 2 that is repeatedly immersed in and pulled out of a water channel, and a dust remover 1 equipped with cleaning means 3 that removes dust adhering to the screen 2, a pressure sensor 20 that measures the water pressure of a supply pipe 6a of bearing lubricating water supplied to a bearing 6 of a cleaning water pump 5 of the cleaning means 3 of the dust remover 1, a flow rate sensor 30 that measures the flow rate of the bearing lubricating water in the supply pipe 6a, a flow rate control valve 40 that is attached on the supply pipe 6a or on the drain pipe 6b between the pressure sensor 20 and the flow rate sensor 30 and the bearing 6 and has an adjustable opening, and a control unit 50 that is electrically connected to the pressure sensor 20, the flow rate sensor 30 and the flow rate control valve 40 and controls the operation of the dust remover 1 to continue by narrowing the opening of the flow rate control valve 40 to maintain the normal pressure above the lower limit when the measurement value of the pressure sensor 20 is below the lower limit of the normal pressure of the cleaning water pump 5, thereby maintaining the normal pressure above the lower limit.

[0019] The pressure sensor 20 is a sensor that is connected to the bearing lubricating water supply pipe 6a and measures the water pressure of the water flowing through the pipe. The flow rate sensor 30 is a sensor that is connected to the bearing lubricating water supply pipe 6a and measures the flow rate of water flowing through the pipe. The flow rate regulating valve 40 is an adjusting valve installed between the bearing 6 and the pressure sensor 20 and flow rate sensor 30 on the bearing lubricating water supply pipe 6a, and can adjust the supply pipe 6a to a predetermined opening. The flow rate regulating valve 40 can be installed not only on the upstream side of the supply pipe 6a (see FIG. 1) but also on the downstream side (on the drain pipe 6b) relative to the bearing 6, and may be installed on either the upstream or downstream side. By placing the flow rate regulating valve 40 in this position, the water pressure and water volume before the supply pipe 6a is adjusted by the valve can be measured.

[0020] The control unit 50 is a PLC (Programmable Logic Controller) that is electrically connected to the pressure sensor 20, the flow rate sensor 30, and the flow rate adjustment valve 40, and when the measured value of the pressure sensor 20 is below the lower limit of the normal pressure of the cleaning water pump 5, narrows the opening of the flow rate adjustment valve 40 to restore the water pressure of the bearing lubricating water to the normal pressure, thereby continuing the operation of the dust removal device 1. The normal pressure of the cleaning water pump 5 is the water pressure in the supply pipe 6a at which the pump can operate steadily, and varies depending on the specifications and specs of the pump. The normal pressure is a pressure with a predetermined upper and lower width (range). Specific control by the control unit 50 is performed as shown in the flow chart in FIG. 2, which will be described later. The remote control unit 60 is a PC (Personal Computer) installed at a location away from the dust removal device 1, and is electrically connected to the pressure sensor 20, the flow sensor 30, and the control unit 50 via wired or wireless communication lines. The remote control unit 60 monitors the pressure sensor 20 and the flow sensor 30 to perform monitoring and control from a remote location.

[0021] [Method for controlling lubricating water for bearings of cleaning water pumps in dust removal equipment] Fig. 2 is a flow chart of the method for controlling lubricating water for the bearings of the cleaning water pump of the dust remover of the present invention. Fig. 3 is an explanatory diagram of the operation control of the control unit. The method for controlling bearing lubricating water for a wash water pump of a dust remover of the present invention measures the water pressure in the bearing lubricating water supply pipe 6a with a pressure sensor 20 during normal operation of the dust remover 1. Also, the flow rate sensor 30 measures the flow rate in the bearing lubricating water supply pipe 6a. (Step 1) The control unit 50 determines whether the measurement value of the pressure sensor 20 is below the lower limit of the normal pressure of the cleaning water pump 5. If it is not below that limit (NO), the pressure of the bearing lubricating water is stable and does not interfere with the operation of the cleaning water pump 5, so normal operation of the dust removal device 1 continues. If it is below that limit (YES), proceed to step 2. (Step 2) A warning is issued from the control unit 50. Specifically, the warning is issued by displaying text such as "Pressure is dropping" on the control panel of the control unit 50 and the monitor of the control panel of the remote control unit 60, turning on a lamp, and issuing a sound.

[0022] (Step 3) The control unit 50 transmits a control signal to the flow rate adjustment valve 40 to narrow the opening of the supply pipe 6a and reduce the flow rate. (Step 4) The control unit 50 determines whether the measurement value of the pressure sensor 20 is equal to or greater than the lower limit of the normal pressure of the wash water pump 5. If it is equal to or greater than the lower limit of the normal pressure (YES), proceed to step 5. If it has not reached the lower limit of the normal pressure (NO), proceed to step 6. (Step 5) The control unit 50 determines whether the measurement value of the flow rate sensor 30 has reached the lower limit of the set flow rate of the bearing lubricating water. In this embodiment, the lower limit of the set flow rate of the bearing lubricating water refers to a flow rate below which there is a high possibility of operational problems, such as bearing seizure, occurring. If it has not been reached (NO), the flow rate adjustment valve 40 is returned to full open (return process), and steady-state operation of the dust removal device 1 is started. If it has been reached (YES), proceed to step 7.

[0023] (Step 6) The control unit 50 determines whether the measurement value of the pressure sensor 20 is the lowest pressure limit of the wash water pump 5. The lowest pressure limit of the wash water pump 5 in this embodiment refers to the water pressure at which continued operation of the pump is likely to cause a malfunction of the bearings 6. If the pressure is not at the lowest limit (NO), proceed to step 3. If the pressure is at the lowest limit (YES), proceed to step 7. (Step 7) The control unit 50 sends a control signal to the wash water pump 5 to stop operation.

[0024] (Step 8) After the wash water pump 5 is stopped, the control unit 50 judges whether or not the measured value of the pressure sensor 20 exceeds the lower limit of the normal pressure of the wash water pump 5. If it exceeds the lower limit (YES), the pressure of the bearing lubricating water is stable and does not interfere with the operation of the wash water pump 5, so the flow rate adjustment valve 40 is returned to full open (return process) and normal operation of the dust removal device 1 is started. If it does not exceed the lower limit (NO), proceed to step 7 and stop operation of the wash water pump 5 until the water pressure is restored. Such a wash water pump bearing lubricating water control method can be performed by a remote control unit 60 located away from the dust removal device 1, making it possible to monitor and control without having to station an operator on-site.

[0025] [Variations] The control unit 50 may be electrically connected to the motor unit 7 of the wash water pump 5, and may perform control to reduce the discharge volume of the wash water pump 5 when the measurement value of the pressure sensor 20 is below the lower limit of the normal pressure of the wash water pump 5. This reduces the load on the bearings 6, making it possible to supply a small amount of wash water to the washing means 3 without stopping the operation of the wash water pump 5, and allowing the operation of the dust removal device 1 to continue. When the control unit 50 controls to reduce the discharge rate of the cleaning water pump 5, it may be electrically connected to the motor unit 4 of the screen 2, and control to decelerate the rotation speed of the screen 2 when the measured value of the pressure sensor 20 is below the lower limit of the normal pressure of the cleaning water pump 5. This makes it possible to prevent the screen from being submerged in water without removing the dust adhering to it, causing the dust to flow to the water intake side. Therefore, the dust removal device can be operated continuously without stopping.

[0026] As shown in Fig. 3, conventionally, when the normal pressure of the wash water pump 5 falls below the lower limit, the wash water pump 5 is immediately stopped. However, according to the present invention, even if the normal pressure of the bearing lubricating water of the wash water pump 5 falls below the lower limit (even if the water pressure drops), the opening of the flow rate regulating valve 40 is narrowed to restore the water pressure to the normal pressure of the wash water pump 5, thereby avoiding the pump from stopping. Therefore, the dust removal device 1 can be maintained in continuous operation. Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and various modifications can be made without departing from the spirit and scope of the present invention. Furthermore, the present invention is not limited to the combinations shown in the embodiments, but can be implemented in various combinations. [Explanation of symbols]

[0027] 1 Dust removal device 2 Screens 3. Cleaning Methods 4 Motor section 5. Washing water pump 6 Bearings 6a Supply pipe 6b Drain pipe 7 Motor section 8 Pressure Sensors 10 Dust removal equipment cleaning water pump bearing lubricating water control device 20 Pressure Sensor 30 Flow Sensor 40 Flow control valve 50 Control section 60 Remote control unit

Claims

1. a pressure sensor for measuring the water pressure in a supply pipe of bearing lubricating water supplied to bearings of a washing water pump of a cleaning means of a dust removing apparatus equipped with a screen that is repeatedly immersed in and pulled out of a water intake channel and a cleaning means for removing dust adhering to the screen; a flow rate sensor for measuring a flow rate of the bearing lubricating water in the supply pipe; a flow rate control valve that is attached to the supply pipe or the drain pipe between the pressure sensor and the flow rate sensor and the bearing and has an adjustable opening degree; A control unit is electrically connected to the pressure sensor, the flow rate sensor, and the flow rate control valve, and when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump, the control unit reduces the opening of the flow rate control valve to maintain the normal pressure above the lower limit and continue operation of the dust removal device.

2. 2. A cleaning water pump bearing lubricating water control device for a dust remover according to claim 1, The control unit is electrically connected to the motor unit of the cleaning water pump, and controls the cleaning water pump to reduce the discharge volume when the measurement value of the pressure sensor is lower than the lower limit of the normal operating pressure of the cleaning water pump.

3. 3. A cleaning water pump bearing lubricating water control device for a dust remover according to claim 2, The control unit is electrically connected to a motor unit of the screen, and performs control to reduce the rotational speed of the screen when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump.

4. a step of measuring the water pressure in a supply pipe of bearing lubricating water supplied to bearings of a washing water pump of a cleaning means of a dust removing apparatus equipped with a screen that is repeatedly immersed in and pulled out of a water intake channel and a cleaning means for removing dust adhering to the screen, using a pressure sensor, and measuring the flow rate of the bearing lubricating water in the supply pipe with a flow rate sensor; A method for controlling lubricating water for a cleaning water pump bearing of a dust removal device, comprising a step of controlling, when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the cleaning water pump, to reduce the opening of a flow control valve installed on the supply pipe or drain pipe between the pressure sensor and the flow sensor and the bearing to maintain the normal pressure above the lower limit and continue operation of the dust removal device.

5. A method for controlling lubricating water for a bearing of a cleaning water pump of a dust remover according to claim 4, comprising the steps of: A method for controlling lubricating water for a wash water pump bearing of a dust removal device, comprising a step of performing control to reduce the discharge volume of the wash water pump when the measurement value of the pressure sensor is lower than the lower limit of the normal operating pressure of the wash water pump.

6. A method for controlling lubricating water for a bearing of a cleaning water pump of a dust remover according to claim 5, comprising the steps of: A method for controlling lubricating water for a bearing of a wash water pump in a dust removal device, comprising a step of performing control to reduce the rotation speed of the screen when the measurement value of the pressure sensor is lower than the lower limit of the normal pressure of the wash water pump.

7. A method for controlling lubricating water for a bearing of a cleaning water pump of a dust remover according to any one of claims 4 to 6, comprising the steps of: A method for controlling lubricating water for a bearing of a cleaning water pump for a dust remover, wherein the control step is performed by remote control at a location away from the dust remover.

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