JPH11230684A - Apparatus for cleaning cooling water tube of condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an apparatus for cleaning a cooling water tube of a condenser for efficiently cleaning the tube in response to a scale adhered state of the tube. SOLUTION: A cleaning controller 24 selects cooling water tubes (8a to 8n) of a condenser to be cleaned based on detection signals of scale detectors 10 (10a to 10n), closes inlet valves 6 (6a to 6n) of the condenser to be cleaned to stop supply of cooling water, and starts supply of the water by opening cleaning valves 23 (23a to 23n). And, a cooling water amount regulating valve 3 regulates a cleaning water pressure regulating valve 20 at a pressure of the cleaning water to the tubes 8 (8a to 8n) while regulating a flow rate of the cooling water so that a condensate temperature of a condenser hot well 14 becomes a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a condenser cooling water pipe cleaning apparatus for cleaning a condenser cooling water pipe of a thermal power plant or a nuclear power plant.

[0002]

2. Description of the Related Art A power plant such as a thermal power plant or a nuclear power plant is provided with a condenser for returning steam (turbine exhaust), which has completed work in a turbine, to water. In this condenser, seawater, river water, and the like are passed through a condenser cooling water pipe to exchange heat with turbine exhaust and return to water. In such condensers, in which seawater and river water flow through the condenser cooling water pipe to return turbine exhaust to water, seawater and river water contain impurities. Adhere to.

[0003] Removal of deposits (hereinafter referred to as scale) adhering to the inner surface of the condenser cooling water pipe is often performed while the turbine is stopped, but is also performed during normal operation of the turbine. The descaling that takes place during normal operation of the turbine will not adversely affect the operation of the turbine,
In a short time, the flow of the cooling water supplied to the condenser cooling water pipe is reversed. By this back washing, a simple blockage attached to the inner surface of the condenser cooling water pipe is removed. In addition, an operation of continuously circulating sponge balls in the narrow pipe of the condenser cooling water pipe to prevent the scale from adhering is performed.

[0004]

However, in such a method of removing scale, it is inevitable that scale adheres to the inner surface of the condenser cooling water pipe, so that when the turbine is stopped, the scale that cannot be removed during turbine operation is removed. Removal is in progress. That is, the water chamber of the condenser is emptied and rubber bullets or brushes are driven into the condenser cooling water pipe by compressed air or pressure water, thereby removing scale.

[0005] This scale removing operation is periodically performed irrespective of dirt on the inner surface of the condenser cooling water pipe. Therefore, the scale removal operation is performed even when there is almost no scale adhesion. This is because the monitoring technology for monitoring the scale adhesion state of the condenser cooling water pipe has not been established.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a condenser cooling water pipe cleaning apparatus capable of efficiently cleaning the condenser cooling water pipe in accordance with the scale adhesion condition.

[0007]

A condenser cooling water pipe cleaning device according to the first aspect of the present invention supplies cooling water to each condenser cooling water pipe through each condenser inlet water chamber, and supplies cooling water to each condenser cooling water pipe. When washing the condenser cooling water pipe of the condenser cooling water pipe system that is merged through the condenser outlet water chamber and flows to the water discharge channel, the condensing temperature of the condenser hot well reaches a predetermined value. The cooling water flow to the condenser cooling water pipe is adjusted by the washing water pressure control valve while the flow rate of the cooling water is adjusted by the cooling water flow control valve so that the condenser cooling water pipe is washed. In the condenser cooling water pipe cleaning device, a scale detector that detects scale deposited on each condenser cooling water pipe, and a condenser cooling water pipe provided on the inlet side of the condenser inlet water chamber and to be cleaned. A cleaning valve for supplying cleaning water, and a cooling target for cooling provided at the inlet side of the condenser inlet water chamber Condenser water chamber inlet valve to supply cooling water to the condenser cooling water pipe and prevent supply of cooling water to the condenser cooling water pipe to be cleaned, and to be cleaned based on the detection signal of the scale detector Select the condenser cooling water pipe, close the condenser water chamber inlet valve to be cleaned and open the cleaning valve,
A washing control device that adjusts the washing water pressure adjusting valve while adjusting the cooling water amount adjusting valve.

In the condenser cooling water pipe cleaning device according to the first aspect of the present invention, the cleaning control device selects a condenser cooling water pipe to be cleaned based on a detection signal of the scale detector, and condenses the water to be cleaned. Close the water supply chamber inlet valve to stop the supply of cooling water, open the cleaning valve and start supplying the cleaning water, and adjust the flow rate of the cooling water so that the condensing temperature of the condenser hot well becomes a predetermined value. The pressure of the washing water to the condenser cooling water pipe is adjusted by the washing water pressure adjusting valve while being adjusted by the cooling water amount adjusting valve. Therefore, the condenser cooling water pipe whose scale exceeds a predetermined value can be selected and washed.

According to a second aspect of the present invention, there is provided a condenser cooling water pipe cleaning apparatus according to the first aspect of the present invention, wherein the cleaning control device is configured to perform cleaning based on the scale detected by each scale detector. Select the condenser cooling water pipe to be cleaned, block the supply of cooling water to the condenser cooling water pipe to be cleaned by closing the condenser water chamber inlet valve, and open the cleaning valve to cool the condenser to be cleaned. A cleaning valve switching control system for supplying cleaning water to the water pipe;
A washing water pressure control system that controls the opening of the washing water pressure control valve based on the pressure deviation so that the pressure of the washing water becomes the pressure set value, and cooling so that the condensate temperature becomes the temperature set value. A cooling water amount control system for controlling an opening degree of the water flow control valve.

In the condenser cooling water pipe cleaning apparatus according to the second aspect of the present invention, in addition to the operation of the condenser cooling water pipe cleaning apparatus of the first aspect, each scale is detected by the cleaning valve switching control system of the cleaning control apparatus. Selects the condenser cooling water pipe to be cleaned based on the scale detected by the condenser, and shuts off the condenser water chamber inlet valve to block the supply of cooling water to the condenser cooling water pipe to be cleaned. Is opened to supply cleaning water to the condenser cooling water pipe to be cleaned. Then, the washing water pressure control system controls the opening degree of the washing water pressure control valve based on the pressure deviation so that the pressure of the washing water becomes the pressure set value, and the condensate water temperature is controlled by the cooling water amount control system. The opening of the cooling water flow control valve is controlled so as to reach the temperature set value.

According to a third aspect of the present invention, there is provided a condenser cooling water pipe cleaning apparatus according to the second aspect, wherein the cleaning valve switching control system is configured to preset a scale detected by the scale detector. A scale comparator that calculates a scale deviation signal in each condenser cooling water pipe by comparing with the set value, and extracts a high value of the scale deviation signal in each condenser cooling water pipe calculated by the scale comparator. A high value priority circuit, a cleaning valve selection circuit for selecting a condenser cooling water pipe to be cleaned based on the high value obtained by the high value priority circuit, and a condenser cooling water pipe corresponding to the high value obtained by the cleaning selection circuit A washing valve opening / closing command circuit that selects an object and outputs an open command to the corresponding washing valve, and a condenser cooling water pipe corresponding to the high value obtained by the washing selection circuit is selected as an object to be washed and a corresponding condenser water. Characterized by comprising a condenser water chamber inlet valve closing command circuit which outputs a closing command to the inlet valve.

In the condenser cooling water pipe cleaning apparatus according to the third aspect of the present invention, in addition to the operation of the condenser cooling water pipe cleaning apparatus of the second aspect, in the cleaning valve switching control system, scale detection is performed by a scale comparator. A scale deviation signal in each condenser cooling water pipe is calculated by comparing the scale detected by the condenser with a preset set value, and a scale deviation signal in each condenser cooling water pipe calculated by the scale comparator is calculated. The high value is taken out by the high value priority circuit, and the condenser cooling water pipe to be cleaned is selected by the cleaning valve selection circuit based on the high value obtained by the high value priority circuit. And the washing valve opening / closing command circuit is
The condenser cooling water pipe corresponding to the high value obtained by the washing selection circuit is selected as a washing target, and an open command is output to the corresponding washing valve.The condenser water chamber inlet valve opening / closing command circuit is obtained by the washing selection circuit. The condenser cooling water pipe corresponding to the obtained high value is selected as a washing target, and a close command is output to the corresponding condenser water chamber inlet valve.

According to a fourth aspect of the present invention, there is provided a condenser cooling water pipe cleaning apparatus according to the second aspect, wherein the cleaning valve switching control system is configured to preset a scale detected by a scale detector. A scale comparator that calculates a scale deviation signal in each condenser cooling water pipe by comparing with the set value, and extracts a high value of the scale deviation signal in each condenser cooling water pipe calculated by the scale comparator. A high value priority circuit, a cleaning valve selection circuit for selecting a condenser cooling water pipe to be cleaned based on the high value obtained by the high value priority circuit, and a condenser cooling water pipe corresponding to the high value obtained by the cleaning selection circuit A washing valve opening / closing command circuit that selects an object and outputs an open command to the corresponding washing valve, and a condenser cooling water pipe corresponding to the high value obtained by the washing selection circuit is selected as an object to be washed and a corresponding condenser water. A condenser water chamber inlet valve opening / closing command circuit for outputting a closing command to the inlet valve, wherein the washing water pressure control system compares the pressure of the washing water with the set pressure value and calculates a pressure deviation signal thereof. A pressure comparator, an adder for adding the high value obtained by the high value priority circuit of the cleaning valve switching control system to the cleaning pressure deviation signal from the cleaning pressure comparator as a bias signal, and washing water based on the signal from the adder. A PID controller for calculating an opening command signal for the pressure control valve.

According to a fourth aspect of the present invention, in addition to the operation of the condenser cooling water pipe cleaning device of the third aspect, in the cleaning water pressure control system, the cleaning water comparator uses a cleaning pressure comparator. Calculates the pressure deviation signal by comparing the pressure with the pressure set value, and adds the high value obtained by the high value priority circuit of the cleaning valve switching control system to the cleaning pressure deviation signal from the cleaning pressure comparator as a bias signal. , And based on the signal from the adder, the opening degree command signal of the washing water pressure control valve is PI
Calculate with the D adjuster.

According to a fifth aspect of the present invention, there is provided a condenser cooling water pipe cleaning apparatus according to the second aspect, wherein the cleaning valve switching control system is preset with a scale detected by a scale detector. A scale comparator that calculates a scale deviation signal in each condenser cooling water pipe by comparing with the set value, and extracts a high value of the scale deviation signal in each condenser cooling water pipe calculated by the scale comparator. A high value priority circuit, a cleaning valve selection circuit for selecting a condenser cooling water pipe to be cleaned based on the high value obtained by the high value priority circuit, and a condenser cooling water pipe corresponding to the high value obtained by the cleaning selection circuit A washing valve opening / closing command circuit that selects an object and outputs an open command to the corresponding washing valve, and a condenser cooling water pipe corresponding to the high value obtained by the washing selection circuit is selected as an object to be washed and a corresponding condenser water. A condenser water chamber inlet valve opening / closing command circuit for outputting a closing command to the inlet valve, wherein the washing water pressure control system compares the pressure of the washing water with the set pressure value and calculates a pressure deviation signal thereof. A pressure comparator, an adder for adding the high value obtained by the high value priority circuit of the cleaning valve switching control system to the cleaning pressure deviation signal from the cleaning pressure comparator as a bias signal, and washing water based on the signal from the adder. A cooling water flow rate control system for comparing the condensed water temperature with the set temperature value and calculating a condensed water temperature deviation signal; And the temperature deviation between the condensed water temperature and the cooling water temperature is added as a bias signal to the condensed water temperature deviation signal obtained by the condensed water temperature comparator, and the washing water pressure is adjusted from the PID controller of the washing water pressure control system. The opening command signal to the valve is also a bias signal. Characterized by comprising an adder for adding the condensate temperature deviation signal, and a PID controller for calculating a degree of opening command signal of the cooling water amount adjusting valve based on a signal from the adder Te.

In the condenser cooling water pipe cleaning apparatus according to the fifth aspect of the present invention, in addition to the operation of the condenser cooling water pipe cleaning apparatus of the fourth aspect, in the cooling water amount control system, the condensing water temperature and its temperature set value The condensate temperature deviation signal is calculated by the condensate temperature comparator, and the condensate temperature obtained by the condensate temperature comparator using the temperature deviation between the condensate temperature and the cooling water temperature as a bias signal by the adder. In addition to the deviation signal, P
The opening command signal from the ID controller to the washing water pressure control valve is also added to the condensed water temperature deviation signal as a bias signal. Then, the PID adjuster calculates an opening command signal of the cooling water amount adjusting valve based on the signal from the adder. This prevents the performance of the condenser from deteriorating due to washing of the condenser cooling water pipe.

[0017]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram of a condenser cooling water pipe cleaning device according to an embodiment of the present invention.

The cooling water to the condenser 9 is pumped from the water intake tank 1 by the circulating water pump 2, and the flow rate of the cooling water is adjusted by controlling the opening of the cooling water flow control valve 3 by the washing control device 24. The cooling water is sent to the cooling water supply path 5, and the cooling water temperature Tw is detected by a cooling water temperature detector 4 provided in the cooling water supply path 5. The cooling water temperature Tw detected by the cooling water temperature detector 4 is input to the cleaning control device 24. The cooling water sent out to the cooling water supply passage 5 passes through each of the condenser water chamber inlet valves 6a to 6n provided on the inlet side of each of the condenser inlet water chambers 7a to 7n, and flows through the condenser. After entering the inlet water chambers 7a to 7n, the cooling water is guided to respective condenser cooling water pipes 8a to 8n inside the condenser 9.

Each of the condenser cooling water pipes 8 is provided with scale detectors 10a to 10n for detecting scale attached to the pipes. The condenser cooling water pipes 8a to 8n have a large number of thousands to tens of thousands, and enormous costs are required to install a detector or the like in each of the condenser cooling water pipes. 10 to 10n are arranged on typical pipes belonging to the condenser water chambers in the condenser cooling water pipes 8a to 8n. Scale detectors 10a-1
The scale detection signals Sa to Sn detected at 0n are input to the cleaning control device 24. Here, each of the condenser water chamber inlet valves 6a to 6n is opened and closed by an opening and closing operation command from the washing control device 24.

The cooling water passing through the condenser cooling water pipes 8a to 8n is supplied to the condenser outlet water chamber 11a provided at the outlet of the condenser 9.
To 11n, and through a drain passage 12 to a drain 13
Led to.

In the condenser 9, the condenser cooling water pipes 8a to 8
The cooling water flowing through n and the turbine exhaust exchange heat, and the turbine exhaust is condensed. This is because the condensate accumulates in the condenser hot well 14. A condenser temperature detector 15 is installed in the condenser hot well 14, and the condenser temperature detector 1
The condensate temperature Tf detected at 5 is input to the cleaning control device 24. The condensate in the condenser hot well 14 is pressurized by the condensate pump 17 and supplied to the boiler through the condensate passage 16.

The washing water for washing the condenser cooling water pipes 8a to 8n is taken from the washing water tank 18 and boosted by the washing pump 19, and the opening degree of the washing water pressure control valve 20 is controlled by the washing control device 24. Thereby, the washing water jetting pressure of the washing header 21 is adjusted. The cleaning pressure Ph of the cleaning header 21 is detected by the cleaning pressure detector 22 and input to the cleaning control device 24.

The flow of the washing water from the washing header 21 is selected by the open washing valve 23 in accordance with the opening / closing operation command of the washing valves 23a to 23n by the washing control device 24.
It flows into any one of the condenser inlet water chambers 7a to 7n to wash any of the condenser cooling water pipes 8a to 8n.

The cleaning controller 24 compares each of the inputted scale detection signals Sa to Sn with its set value S0, takes out the high value of the deviation signal ΔS, and cleans the condenser cooling water pipe 8j for cleaning. Select That is, the condenser cooling water pipe 8j to which the scale is most adhered is selected, the condenser water chamber inlet valve 6j of the condenser cooling water pipe 8j to be cleaned is closed, and the cleaning valve 23j is opened. Then, the cleaning pump 19 is started to start cleaning the condenser cooling water pipe 8j.

At this time, the cleaning control device calculates the target opening degree of the cleaning water pressure control valve 20 based on the cleaning pressure Ph of the cleaning header and the scale detection signals Sa to Sb, thereby obtaining the cleaning water ejection pressure. Control. Further, the cooling water temperature Tw
The target opening of the cooling water flow control valve 3 is calculated based on the condensate temperature Tf, and the condensate temperature is controlled thereby to keep the performance of the condenser 9 constant.

Therefore, the cleaning control device 24 sequentially cleans the condenser cooling water pipes 8 whose scale exceeds the set value, in order of decreasing scale adhesion, while keeping the performance of the condenser 9 constant. Will be done.

FIG. 2 is an explanatory diagram of the scale detector 10. The scale detector 10 is provided with a laser beam projecting section 25a above the condenser cooling water pipe 8, a laser beam receiving section 25b below the condenser cooling water pipe 8, and a laser beam projecting section 25a.
The laser beam is projected from the laser beam, the laser beam is received by the laser beam receiving section 25b, and the amount of the received laser beam is measured to detect the adhesion of the scale. That is, since the amount of the laser light received by the laser light receiving unit 25b changes according to the amount of the scale 25c attached to the laser light receiving unit 25b, the amount of the attached scale 25c is detected based on the amount of the laser light. Become.

FIG. 3 is a block diagram of the cleaning control device 24 according to the embodiment of the present invention. Cleaning control device 2
Reference numeral 4 denotes a cleaning valve switching control system that outputs an opening / closing operation command to the cleaning valve 23 and the condenser water chamber inlet valve 6, a cleaning water pressure control system that controls the opening degree of the cleaning water pressure control valve, and a cooling water flow rate. A cooling water amount control system for controlling the opening of the control valve.

The cleaning valve switching control system selects the condenser cooling water pipe 8j to be cleaned based on the scales Sa to Sn detected by the scale detectors 10a to 10n, and the condenser cooling water pipe to be cleaned. 8j. That is, the condenser water chamber inlet valve 6j is closed to prevent the supply of the cooling water, and the cleaning valve 23j is opened to supply the cleaning water to the condenser cooling water pipe 8j to be cleaned.

Further, the washing water pressure control system supplies the washing water to the condenser cooling water pipe 8j to be washed based on the pressure deviation ΔP so that the washing water pressure Ph becomes the set pressure value P0. It controls the opening of the cleaning water pressure control valve 8j for supplying. In this case, the cleaning pressure Ph is compensated for in advance by the size of the scale Sj.

The cooling water amount control system controls the opening of the cooling water flow control valve 3 so that the condensed water temperature Tf becomes the set temperature value T0.
Is compensated for in advance.

First, in the cleaning valve switching control system, the scales Sa to Sn detected by the respective scale detectors 10a to 10n are input to the scale comparator 38. In the scale comparator 38, each of the scale detectors 10a to 10a-1
0n is compared with a preset set value S0, and the condenser cooling water pipes 8a to 8n are compared.
Are calculated.

The scale deviation signals ΔSa to ΔSn are input to the high value priority circuit 39, and the scale deviation signals ΔSa to
The high value ΔSj of ΔSn is extracted. That is, the scale deviation signal ΔS of the condenser cooling water pipe 8j having the largest amount of scale in each of the condenser cooling water pipes 8a to 8n.
j is calculated, and in the cleaning valve selection circuit 42, the high-value scale deviation signal ΔSj obtained by the high-value priority circuit 39.
, The condenser cooling water pipe 8j to be cleaned is selected.

The washing valve opening / closing command circuit 43 outputs an opening command to the washing valve 23j corresponding to the condenser cooling water pipe 8j corresponding to the high-level scale deviation signal ΔSj obtained by the washing selecting circuit 42. The condenser water chamber inlet valve opening / closing command circuit 44 is connected to the condenser water chamber inlet valve 6j corresponding to the condenser cooling water pipe 8j corresponding to the high-level scale deviation signal ΔSj obtained by the washing selection circuit 42. Outputs the close command. As a result, the supply of the cooling water to the condenser cooling water pipe 8j to be cleaned is stopped, and the condenser water can be supplied to the condenser cooling water pipe 8j.

In the washing valve switching control system, the scale detection signal Sj is constantly monitored even during washing, and the condenser cooling water pipe 8j
When the scale adhering to the surface becomes equal to or less than the set value S0, the washing valve opening / closing command circuit 43 outputs a closing command of the washing valve 23j to close the washing valve 23j, and simultaneously sets a condenser water chamber outlet valve opening / closing command. The circuit 44 outputs a command to close the condenser water chamber outlet valve 6j, opens the condenser water chamber outlet valve 6j, resumes the supply of cooling water, and ends the washing of the condenser cooling water pipe 8j.

Next, in the cleaning pressure adjusting system, the cleaning pressure P of the cleaning header 21 detected by the cleaning pressure detector 22 is determined.
h is input to the cleaning pressure comparator 32. The cleaning pressure comparator 32 compares the cleaning pressure Ph with its set pressure value P0, and calculates a cleaning pressure deviation signal ΔP. Then, the cleaning pressure deviation signal ΔP is input to the adder 37.
The adder 37 is also supplied with a bias signal obtained through the bias unit 40 from the high-value scale deviation signal ΔSj obtained by the high-value priority circuit 39 of the cleaning valve switching control system.
That is, the adder 37 adds the scale deviation signal ΔSj to the cleaning pressure deviation signal ΔP from the cleaning pressure comparator 32 as a bias signal. Thereby, the cleaning pressure Ph
Is controlled in advance.

That is, the PID controller 33 calculates the opening command signal of the washing water pressure control valve 20 based on the signal from the adder 37 taking into account the bias signal based on the scale deviation signal ΔSj, The opening of the washing water pressure control valve 20 is adjusted via the converter 41 to control the washing pressure.

In the cooling water amount control system, the condensed water temperature Tf detected by the condensed water temperature detector 15 is converted into an electric signal by the temperature / electrical converter 26, and the condensed water temperature comparator 2
7 and input to the adder 30. Condensate temperature comparator 27
Then, the condensed water temperature Tf is compared with the temperature set value T0 to calculate a condensed water temperature deviation signal ΔTf, and the condensed water temperature deviation signal ΔTf is input to the adder 28.

On the other hand, the cooling water temperature Tw detected by the cooling water temperature detector 4 is converted into an electric signal by the temperature / electrical converter 29 and input to the adder 30. Is compared with the condensate temperature Tf converted to That is, the adder 30 calculates the temperature deviation ΔT between the condensed water temperature Tf and the cooling water temperature Tw, and inputs the bias signal obtained via the bias unit 31 to the adder 28.

In the adder 28, the bias signal is added to the condensate temperature deviation signal ΔTf obtained by the condensate temperature comparator, and the wash water pressure control valve 20 from the PID controller 33 of the wash water pressure control system. Is also added to the condensate temperature deviation signal ΔT as a bias signal. And PI
The D adjuster 35 calculates an opening command signal for the cooling water flow control valve 3 based on the signal obtained by the adder 28, and determines the opening of the cooling water flow control valve 3 via the electropneumatic converter 36. Adjust and control the amount of cooling water. This prevents the condenser performance from deteriorating during cleaning of the condenser cooling water pipe 8j.

As described above, in the condenser cooling water pipe cleaning apparatus according to the embodiment of the present invention, the condenser water chamber to be cleaned and the condenser cooling water pipes 8a to 8b are selected by selecting the condenser cooling water pipe. The scale detection signal for each of 8a to 8b is compared with a set value, the high value of the scale deviation signal ΔS is extracted, and the corresponding condenser cooling water pipe 8j is selected. Then, since the selected condenser cooling water pipe 8j is washed, the water chamber to which the scale is most attached and the condenser cooling water pipe 8j can be sequentially washed, and efficient washing can be performed.

In the cleaning of the scale adhering to the inside of the condenser cooling water pipe of the condenser 9, the jet pressure of the cleaning header 21 is changed to the cleaning pressure deviation signal ΔP of the cleaning header 21 by the scale deviation signal ΔS. Is controlled as a bias signal, so that the condenser water chamber and the condenser cooling water pipes 8a to 8n can be efficiently cleaned.

When the condenser cooling water pipes 8a to 8n are washed during the operation of the plant, the cooling water flow control valve 3 is controlled so that the condenser temperature Tf of the condenser 9 maintains its set value.
, The deterioration of the performance of the condenser 9 can be prevented even during the cleaning of the condenser cooling water pipes 8a to 8n.

[0044]

As described above, according to the present invention, in the condenser cooling water pipe system for cooling the turbine exhaust with the condenser, the scale attached to the inside of the condenser cooling water pipe is constantly monitored to generate power. Since the cleaning can be performed during the operation of the plant, the scale can be efficiently removed. This eliminates the need for cleaning work at the time of regular inspection of the power plant, thereby reducing periodic inspection periods and cleaning costs.

Further, since the amount of cooling water is controlled so that the condensate temperature is maintained at a predetermined value even during the washing operation, the condenser can be operated efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram of a condenser cooling water pipe cleaning device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a scale detector according to the embodiment of the present invention.

FIG. 3 is a block diagram of a cleaning control device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake tank 2 Circulating water pump 3 Cooling water flow control valve 4 Cooling water temperature detector 5 Cooling water supply path 6 Condenser water chamber inlet valve 7 Condenser inlet water chamber 8 Condenser cooling water pipe 9 Condenser 10 Scale detector 11 Condenser outlet water chamber 12 Drainage channel 13 Drainage channel 14 Condenser hot well 15 Condensate temperature detector 16 Condensate channel 17 Condensate pump 18 Wash water tank 19 Wash water pump 20 Wash water pressure control Valve 21 Cleaning Header 22 Cleaning Pressure Detector 23 Cleaning Valve 24 Cleaning Controller 25a Laser Beam Projector 25b Laser Beam Receiver 25c Scale 26 Temperature / Electrical Converter 27 Adder 28 Adder 29 Temperature / Electric Converter 30 Adder Reference Signs List 31 bias unit 32 cleaning pressure comparator 33 PID adjuster 34 bias unit 35 PID adjuster 36 electropneumatic converter 37 adder 38 scale comparator 39 Value preference circuit 40 bias 41 electropneumatic transducer 42 flush valve selection circuit 43 flush valve switching command circuit 44 condenser water chamber outlet valve switching command circuit

Claims (5)

[Claims] 1. A condenser in which cooling water is supplied to each condenser cooling water pipe through each condenser inlet water chamber and merged through each condenser outlet water chamber to flow to a discharge channel. When cleaning the condenser cooling water pipe of the condenser cooling water pipe system, the flow rate of the cooling water is adjusted by a cooling water amount control valve so that the condensing temperature of the condenser hot well becomes a predetermined value. In the condenser cooling water pipe cleaning device in which the pressure of the cleaning water to the condenser cooling water pipe is adjusted by a cleaning water pressure control valve to wash the condenser cooling water pipe, each of the condenser cooling water pipes A scale detector for detecting scale deposited on the condenser; a cleaning valve provided on the inlet side of the condenser inlet water chamber for supplying cleaning water to a condenser cooling water pipe to be cleaned; Cooling water is supplied to the condenser cooling water pipe provided at the inlet side of the A condenser water chamber inlet valve for preventing supply of cooling water to a condenser cooling water pipe to be washed, and selecting a condenser cooling water pipe to be washed based on a detection signal of the scale detector; A washing control device for closing the condenser water chamber inlet valve to be washed, opening the washing valve, and adjusting the washing water pressure adjusting valve while adjusting the cooling water amount adjusting valve. Condenser cooling water pipe cleaning device. 2. The condenser cooling water pipe cleaning device according to claim 1, wherein the cleaning control device selects a condenser cooling water pipe to be cleaned based on a scale detected by each of the scale detectors. Cleaning for supplying cooling water to the condenser cooling water pipe to be cleaned by closing the condenser water chamber inlet valve and opening the cleaning valve to supply cleaning water to the condenser cooling water pipe to be cleaned A valve switching control system, a washing water pressure control system that controls the opening of a washing water pressure control valve based on the pressure deviation such that the pressure of the washing water becomes the pressure set value, and the condensate temperature is A condenser cooling water pipe cleaning device, comprising: a cooling water amount control system that controls an opening degree of the cooling water flow control valve so as to be a temperature set value. 3. The condenser cooling water pipe cleaning device according to claim 2, wherein the cleaning valve switching control system compares each of the condensers detected by the scale detector with a preset set value to each condenser condenser. A scale comparator for calculating a scale deviation signal in the cooling water pipe; a high value priority circuit for extracting a high value of the scale deviation signal in each condenser cooling water pipe calculated by the scale comparator; and a high value priority circuit. A cleaning valve selection circuit for selecting a condenser cooling water pipe to be cleaned based on the high value obtained, and a condenser cooling water pipe corresponding to the high value obtained in the cleaning selection circuit selected as a cleaning target and a corresponding cleaning valve. A washing valve opening / closing command circuit that outputs an opening command, and a condenser cooling water pipe corresponding to the high value obtained by the washing selection circuit are selected as washing targets, and a closing command is output to a corresponding condenser water chamber inlet valve. And a condenser water chamber inlet valve opening / closing command circuit. 4. The condenser cooling water pipe cleaning device according to claim 2, wherein the cleaning valve switching control system compares the scale detected by the scale detector with a preset set value, and sets each of the condensers. A scale comparator for calculating a scale deviation signal in the cooling water pipe; a high value priority circuit for extracting a high value of the scale deviation signal in each condenser cooling water pipe calculated by the scale comparator; and a high value priority circuit. A cleaning valve selection circuit for selecting a condenser cooling water pipe to be cleaned based on the high value obtained, and a condenser cooling water pipe corresponding to the high value obtained in the cleaning selection circuit selected as a cleaning target and a corresponding cleaning valve. A washing valve opening / closing command circuit that outputs an opening command, and a condenser cooling water pipe corresponding to the high value obtained by the washing selection circuit are selected as washing targets, and a closing command is output to a corresponding condenser water chamber inlet valve. A washing water pressure control system, wherein the washing water pressure control system compares the pressure of the washing water with a pressure set value thereof and calculates a pressure deviation signal thereof; An adder for adding, as a bias signal, a high value obtained by the high value priority circuit of the cleaning valve switching control system to a cleaning pressure deviation signal from the cleaning pressure comparator; and a cleaning water pressure based on a signal from the adder. A condenser cooling water pipe cleaning device, comprising: a PID controller for calculating an opening command signal of a control valve. 5. The condenser cooling water pipe cleaning device according to claim 2, wherein the cleaning valve switching control system compares each of the condensers detected by the scale detector with a preset set value to each condenser. A scale comparator for calculating a scale deviation signal in the cooling water pipe; a high value priority circuit for extracting a high value of the scale deviation signal in each condenser cooling water pipe calculated by the scale comparator; and a high value priority circuit. A cleaning valve selection circuit for selecting a condenser cooling water pipe to be cleaned based on the high value obtained, and a condenser cooling water pipe corresponding to the high value obtained in the cleaning selection circuit selected as a cleaning target and a corresponding cleaning valve. A washing valve opening / closing command circuit that outputs an opening command, and a condenser cooling water pipe corresponding to the high value obtained by the washing selection circuit are selected as washing targets, and a closing command is output to a corresponding condenser water chamber inlet valve. A washing water pressure control system, wherein the washing water pressure control system compares the pressure of the washing water with a pressure set value thereof and calculates a pressure deviation signal thereof; An adder for adding, as a bias signal, a high value obtained by the high value priority circuit of the cleaning valve switching control system to a cleaning pressure deviation signal from the cleaning pressure comparator; and a cleaning water pressure based on a signal from the adder. A cooling water amount control system for comparing the condensed water temperature with a set temperature value thereof and calculating a condensed water temperature deviation signal; A temperature deviation between the condensate temperature and the cooling water temperature as a bias signal to a condensate temperature deviation signal obtained by the condensate temperature comparator, and a P value of the washing water pressure control system.
An adder for adding an opening command signal from the ID controller to the washing water pressure control valve to the condensed water temperature deviation signal as a bias signal; and an opening of the cooling water flow control valve based on the signal from the adder. A condenser cooling water pipe cleaning device, comprising: a PID controller for calculating a command signal.