KR102059245B1 - System for Cooling Working Fluid Discharged from Turbine and Method for Controlling That System - Google Patents

Abstract

A discharge working fluid cooling system of a turbine according to an aspect of the present invention capable of predicting a degree of vacuum of a condenser changed according to a surrounding situation includes: a condenser for condensing the working fluid discharged from a turbine for driving a generator using cooling water; A driving device composed of a plurality of devices to operate the capacitor; Sensing values collected over a predetermined period of time for each of the first factors in the vacuum model including first factors that are dependent on the plurality of facilities and change according to the state of each facility and second factors that are independent of each facility. An optimum vacuum predicting unit which substitutes a reference value, which is any one of the values, and predicts an optimum vacuum degree of the condenser by substituting the sensing values of the second factors sensed at each point in time for each of the second factors; And a vacuum degree controller which adjusts the vacuum degree of the condenser using the optimum vacuum degree.

Description

System for Cooling Working Fluid Discharged from Turbine and Method for Controlling That System}

The present invention relates to a cooling system, and more particularly to a cooling system capable of cooling the working fluid discharged from the turbine.

The turbine is rotated by the working fluid to drive the generator, allowing the generator to generate energy. The working fluid discharged from the turbine after being used for the rotation of the turbine is condensed by a cooling device such as a condenser. As such, the condenser improves turbine efficiency by increasing heat drop held by the working fluid discharged from the turbine, and reduces system maintenance costs by allowing the condensed working fluid to be reused.

An example of a condenser is presented in Korean Patent Publication No. 10-2016-0059065 (name of the invention: a floating power generation line for recycling the waste heat of the condenser of the condenser steam turbine, hereinafter referred to as 'prior document 1'). In Prior Art 1, steam water is recovered using condenser introduced seawater, and high temperature (approximately 40 to 50 ° C) seawater discharged from the condenser is a facility for generating heat, a propulsion facility, a facility for generating fresh water, and the like. The contents of the offer are presented.

In general, when the pressure (vacuum degree) of the condenser is high, the working fluid of the turbine does not expand sufficiently, so that the rated output is lowered, which lowers the turbine efficiency. Therefore, the vacuum degree of the condenser is an important factor in determining the efficiency of the turbine. However, it is not easy to accurately calculate the vacuum degree of the condenser because the vacuum degree of the condenser changes according to the surrounding conditions. Therefore, a method of calculating a vacuum degree of a capacitor using a value of a theoretical correction curve provided by a capacitor manufacturer as shown in FIG. 1 has been proposed.

However, since the method of calculating the capacitor vacuum degree using the theoretical correction curve shown in FIG. 1 is to calculate the vacuum degree by the formula calculated under the ideal condition in which external conditions are fixed as constants, the capacitor calculated according to this method is calculated. The degree of vacuum is inevitably different from the actual degree of vacuum, which changes according to the current situation in real time. Therefore, the efficiency of the turbine is optimized by controlling the capacitor based on the degree of vacuum of the capacitor. .

Prior Document 1: Korean Patent Publication No. 10-2016-0059065 (Invention name: floating power generation line to recycle the waste heat of the condenser steam turbine)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a turbine operating fluid cooling system and a control method thereof capable of predicting a vacuum degree of a condenser that changes according to surrounding conditions.

In addition, another object of the present invention is to provide a turbine operating fluid cooling system and a control method thereof, which can calculate an improvement in vacuum degree compared to the current vacuum degree using sensing values of factors influencing the vacuum degree of a condenser. .

Another object of the present invention is to provide a discharge working fluid cooling system of a turbine capable of guiding adjustable factors to achieve a degree of vacuum improvement and a control method thereof.

According to an aspect of the present invention, there is provided a discharge working fluid cooling system for a turbine, including: a condenser for condensing working fluid discharged from a turbine for driving a generator using cooling water; A driving device composed of a plurality of devices to operate the capacitor; Sensing values collected over a predetermined period of time for each of the first factors in the vacuum model including first factors that are dependent on the plurality of facilities and change according to the state of each facility and second factors that are independent of each facility. An optimum vacuum predicting unit which substitutes a reference value, which is any one of the values, and predicts an optimum vacuum degree of the condenser by substituting the sensing values of the second factors sensed at each point in time for each of the second factors; And a vacuum degree controller which adjusts the vacuum degree of the condenser using the optimum vacuum degree.

According to another aspect of the present invention, there is provided a method for controlling a discharge working fluid cooling system of a turbine, the first factors being dependent on a plurality of facilities for performing a condensation function of a condenser and changed according to the state of each facility. In the vacuum model composed of second factors independent of each facility, the reference value selected from the sensing values collected for the first predetermined period for each of the first factors and the sensing values of the second factors sensed at the present time point are substituted. Predicting an optimum vacuum degree of the condenser; Selecting an adjustable target factor to achieve a degree of vacuum improvement determined based on the optimum degree of vacuum among the first factors; And adjusting the vacuum degree of the condenser by controlling the equipment on which the selected target factor depends.

A discharge working fluid cooling system of a turbine according to another aspect of the present invention for achieving the above object, the first factor is dependent on a plurality of equipment for the operation of the condenser for condensing the working fluid is changed according to the state of each equipment And a second factor independent of each of the installations, each of the first factors is substituted with a reference value, which is a value selected from one of the sensing values collected in the past for a predetermined period, and for each of the second factors. And an optimum vacuum degree predicting unit predicting an optimum vacuum degree of the capacitor by substituting the sensed value sensed at the time point.

Power generation system according to another aspect of the present invention for achieving the above object is a turbine for driving a generator; In the vacuum degree model consisting of a first factor that is dependent on a plurality of equipment for the operation of the condenser for condensing the working fluid discharged from the turbine changes according to the state of each equipment and the second factors independent of each equipment Cooling that predicts the optimum vacuum degree of the condenser by substituting a reference value, which is any one selected among sensing values collected for a predetermined period, for each one factor, and a sensing value sensed at the present time for each of the second factors. It characterized in that it comprises a device.

According to the present invention, it is possible to predict the current vacuum degree of a capacitor that changes according to surrounding conditions by using current sensing values of factors determined to affect the vacuum degree of the capacitor through big data analysis, and based on the predicted current vacuum degree of the capacitor. By controlling the furnace cooling system, the efficiency of the turbine can be maximized and the maintenance standard of the cooling system can be established.

In addition, according to the present invention by quantifying the degree of vacuum improvement compared to the current degree of vacuum by calculating the degree of vacuum improvement based on the optimum vacuum calculated based on the optimal sensing value of each factor and the current degree of vacuum calculated based on the current sensing value of each factor The effect can be provided to the user.

In addition, the present invention has the effect of maximizing the ease of control of the cooling system by guiding the user with an optimal factor for achieving the calculated degree of vacuum improvement among the plurality of factors.

1 is a graph showing the theoretical calibration curve used for the vacuum degree calculation.
Figure 2 is a block diagram schematically showing the configuration of the discharge working fluid cooling system of the turbine according to an embodiment of the present invention.
3 is a view showing the configuration of the turbine shown in FIG.
4 is a view showing the configuration of the capacitor shown in FIG.
5 is a view showing the configuration of the cooling water supply equipment shown in FIG.
6 is a block diagram showing the configuration of the control device shown in FIG.
7 is a flowchart showing a control method of the discharge working fluid cooling system of the turbine according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The meaning of the terms described herein will be understood as follows.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and the terms “first”, “second”, etc. are used to distinguish one component from another. The scope of the rights shall not be limited by these terms.

It is to be understood that the term "comprises" or "having" does not preclude the existence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof.

The term "at least one" should be understood to include all combinations which can be presented from one or more related items. For example, the meaning of "at least one of the first item, the second item, and the third item" means not only the first item, the second item, or the third item, but also two of the first item, the second item, and the third item, respectively. A combination of all items that can be presented from more than one.

Figure 2 is a block diagram schematically showing the configuration of the discharge working fluid cooling system of the turbine according to an embodiment of the present invention.

As shown in FIG. 2, the discharge working fluid cooling system 200 of the turbine according to an embodiment of the present invention includes a turbine 210, a condenser 220, a driving device 230, and a control device 240. Include.

At this time, the driving device 230 is composed of a plurality of equipment (250 ~ 295) to operate the condenser 220 so that the condenser 220 performs a condensation function, as shown in Figure 2, It may include at least one of the vacuum pump 250, the cooling water supply equipment 260, the filter 265, the cleaning equipment 270, the discharge pump 280, the water purification equipment 290, and the heat exchanger (295). .

The turbine 210 rotates by a high temperature working fluid supplied to the turbine 210 to operate a generator (not shown) connected to the turbine 210. Electric energy is generated by the operation of the generator. In one embodiment, the turbine 210 may be a steam turbine and may be composed of a high pressure steam turbine 212, a medium pressure steam turbine 214, and a low pressure steam turbine 216 as shown in FIG. 3. . At this time, since the low pressure steam turbine 216 is connected to the condenser 220 as shown in FIG. 3, a high temperature working fluid discharged from the low pressure steam turbine 216 is supplied to the condenser 220.

The condenser 220 condenses the hot working fluid discharged from the turbine 210 after the rotation of the turbine 210 using the coolant. The working fluid cooled by the condenser 220 is provided to other facilities through the discharge pump 280. In particular, since the condenser 220 according to the present invention is connected to the low pressure steam turbine 216 as shown in FIG. 3, the steam discharged from the low pressure steam turbine 216 is cooled and condensed to recover water.

As such, the condenser 220 increases the efficiency of the turbine 210 by increasing the heat drop retained by the working fluid and reduces the processing cost of the working fluid by allowing the condensed working fluid to be reused. In addition, the condenser 220 may serve to replenish the working fluid or may be used as various drain recovery sites.

An example of a condenser 220 is shown in FIG. 4. As shown in FIG. 4, the condenser 220 includes a fuselage 410, a plurality of tubes 420 disposed within the fuselage 410, and a coolant reservoir 430 disposed at the inlet and outlet sides of the fuselage 410. And a working fluid reservoir 440 disposed under the fuselage 410. At this time, the coolant reservoir 430 includes an inlet coolant reservoir 432 provided at the side into which the coolant is introduced and an outlet coolant reservoir 434 provided at the side at which the coolant is discharged.

According to the configuration as described above, the coolant supplied from the coolant supply facility 250 flows into the inlet coolant reservoir 432 provided at the inlet side of the fuselage 410, and the coolant introduced into the inlet coolant reservoir 432. Passes through the plurality of tubes 420 is discharged to the outlet coolant reservoir 434 provided on the outlet side of the body 410. At this time, when a high temperature working fluid is input from the turbine 210 to the upper portion of the body 410, the high temperature working fluid is condensed by passing latent heat to the coolant while passing through the outside of the tube 420 through which the coolant flows. Collected in the working fluid reservoir 440 provided at the bottom of the.

The vacuum pump 250 adjusts the internal pressure of the condenser 220 to make the inside of the condenser 220 in a vacuum state so that a high temperature working fluid flowing into the condenser 220 can be condensed into a low temperature working fluid. At this time, as the internal pressure of the condenser 220 is lowered by the vacuum pump 250, that is, as the degree of vacuum of the condenser 220 is increased, the pressure difference between the turbine 210 and the condenser 220 is increased so that the high temperature working fluid is low. The efficiency of condensation into the working fluid is improved, and accordingly the output of the turbine 210 is also improved. In one embodiment, the vacuum pump 250 may be redundant with two pumps.

The cooling water supply facility 260 supplies cooling water for condensing the high temperature working fluid to the condenser 220. In one embodiment, the cooling water supply facility 260 may supply seawater to the condenser 220 as the cooling water. Hereinafter, the configuration of the cooling water supply facility 260 according to the present invention will be described in detail with reference to FIG. 5.

5 is a view showing the configuration of the cooling water supply equipment according to an embodiment of the present invention. As shown in FIG. 5, the cooling water supply facility 260 according to the exemplary embodiment includes a water tank 510, a main cooling water supply pump 520, and a sub cooling water supply pump 530.

The water tank 510 stores the coolant to be supplied to the condenser 220.

The main cooling water supply pump 520 pumps the cooling water stored in the water tank 510 and supplies the cooling water stored in the water tank 510 to the condenser 220 and the heat exchanger 295 through the main stream 522. In one embodiment, the main coolant feed pump 520 may be redundant as shown in FIG. 5.

The sub cooling water supply pump 530 pumps the cooling water stored in the water tank 510 and supplies the cooling water stored in the water tank 510 to the heat exchanger 295 through the sub stream 524. In one embodiment, the sub coolant supply pump 530 may be redundant as shown in FIG. 5.

Specifically, in the normal state, since the main coolant supply pump 520 is on and the sub coolant supply pump 530 is off, the flow rate of the main coolant supply pump 520 is distributed to the condenser 220 and the heat exchanger 295. Supplied. When it is determined that the condenser 220 lacks the coolant, the sub coolant supply pump 530 is turned on, so that all of the coolant pumped by the main coolant supply pump 520 is supplied to the condenser 220, and the sub coolant supply pump 530. Cooling water pumped by) is supplied to the heat exchanger 295.

On the other hand, when seawater is used as the cooling water, the cooling water supply facility 260 according to the present invention may further include a seawater supply pump 540. The seawater supply pump 540 pumps seawater and supplies the seawater to the water tank 510. At this time, the seawater supply pump 540 may be doubled as two pumps as shown in FIG.

Referring back to FIG. 2, the filter 265 is disposed at the outlet side of the cooling water supply facility 260 to filter the cooling water discharged from the cooling water supply facility 260. Specifically, as illustrated in FIG. 5, the filter 265 may include a first filter 265a disposed at the outlet side of the main cooling water supply pump 520 and an outlet side of the sub coolant supply pump 530. It may include two filters (265b). The first filter 265a removes foreign substances (eg, shells or shells) included in the cooling water from the cooling water discharged from the main cooling water supply pump 520. The second peter 265b removes foreign matters contained in the cooling water from the cooling water discharged from the sub cooling water supply pump 530.

Since the coolant supplied to the condenser 220 and the heat exchanger 295 is filtered through the filter 265, contamination of the condenser 220 and the heat exchanger 295 may be prevented.

The cleaning facility 270 cleans the plurality of tubes 420 and the coolant reservoir 430 constituting the condenser 220. In one embodiment, the cleaning facility 270 may be a ball strainer.

The discharge pump 280 supplies the low temperature working fluid discharged from the condenser 220 to other facilities.

The water purification equipment 290 serves to maintain the working fluid in high purity by removing metal oxides and impurities such as iron or the like contained in the working fluid flowing into the condenser 220 or discharged from the condenser 220.

The heat exchanger 295 cools the high temperature cooling water discharged from the condenser 220. In one embodiment, the heat exchanger 295 cools the hot coolant discharged from the condenser 220 by using the coolant supplied from the main coolant supply pump 520 shown in FIG. 5, or the sub coolant supply pump. The high temperature cooling water discharged from the condenser 220 may be cooled using the cooling water supplied from the 530.

The controller 240 predicts the current vacuum degree and the optimal vacuum degree of the condenser 220 by using the sensing values sensed from the devices 240 to 295 constituting the driving device 230, and predicts the predicted current vacuum degree and the optimum vacuum degree. Each facility 240 to 295 is controlled to improve the degree of vacuum of the condenser 220 based on the degree of vacuum.

The lower the temperature of the cooling water and the higher the flow rate, the higher the vacuum degree of the condenser 220. However, when seawater is used as the cooling water, the temperature of the seawater is influenced by the seasons, which makes it impossible to control the seawater flow rate. Increasing the operating force of the (260) can increase the flow rate, but will increase the power consumption. In addition, even if the flow rate of the sea water is increased, the degree of vacuum cannot be improved when the facilities for removing impurities in the sea water do not operate normally or the opening ratio of the valves for moving the coolant in the condenser 220 is not appropriate or when maintenance is required. .

Therefore, in the present invention, not only the vacuum degree of the condenser 220 is controlled by merely controlling the flow rate or temperature of the cooling water, but also the current vacuum degree based on the sensing values sensed by the controller 240 from the facilities 240 to 295. And predicting the optimum vacuum degree and controlling the respective equipments 240 to 295 to improve the vacuum degree based on the prediction result.

Hereinafter, the configuration of the control device 240 according to the present invention with reference to FIG. 6 will be described in more detail.

6 is a block diagram showing the configuration of a control device 240 according to an embodiment of the present invention. As shown in FIG. 6, the control device 240 according to an embodiment of the present invention includes a data collector 610, a modeling unit 620, a current vacuum degree predictor 630, and an optimum vacuum degree predictor 640. , And a vacuum degree control unit 650.

The data collector 610 collects sensing values of factors required for calculating the degree of vacuum of the condenser 220 from sensors (not shown) installed in the exhaust working fluid cooling system 200 of the turbine. In this case, the factor to be sensed is dependent on the respective equipments 250 to 295 constituting the driving device 230 and the first factors and the respective equipments 250 to 295 changed under the control of each equipment 250 to 295. ) Are independent of the second factor and are uncontrolled.

In one embodiment, the first factors that are changed under the control of the vacuum pump 250 of the first factors, the pressure difference of the cooling water passing through the vacuum pump 250, the internal pressure of the condenser 220 and the vacuum pump 250 may include at least one of a pressure difference between the inlet pressures and a first set value set for each cleaning period of the vacuum pump 250.

At this time, the pressure difference of the cooling water passing through the vacuum pump 250 means a pressure difference of the cooling water passing through the heat exchanger (not shown) included in the vacuum pump 250, the heat exchanger included in the vacuum pump 250 It can be sensed using a pressure sensor installed on the inlet and outlet side of the. The pressure difference between the internal pressure of the condenser 220 and the inlet pressure of the vacuum pump 250 may be measured by using pressure sensors installed at the inlet and outlet sides of the vacuum pump 250.

The first set value set for each cleaning transition period of the vacuum pump 250 is a value for one day after the filter cleaning date of the heat exchanger included in the vacuum pump 250, a value for two days, and three days after curing. Value, after 4 days, after 5 days and after 1 day from the tube cleaning date of the heat exchanger included in the vacuum pump 250, after 2 days, after 3 days of curing For, after 4 days, and after 5 days.

Among the first factors, the first factors changed according to the control of the coolant supply facility 260 include a main coolant flow rate controlled by the main coolant supply pump 520, a square value of the main coolant flow rate, and a cube value of the main coolant flow rate. , At least one of a sub coolant flow rate controlled by the sub coolant supply pump 530, an inlet and outlet pressure difference of the main coolant supply pump 520, and an inlet and outlet pressure difference of the sub coolant supply pump 530.

In this case, the main coolant flow rate controlled by the main coolant supply pump 520 may be obtained by using a flow sensor or a pressure sensor installed in the main stream 522, and the sub coolant supplied by the sub coolant supply pump 530 may be obtained. The cooling water flow rate may be obtained by using a flow rate sensor or a pressure sensor installed in the sub stream 532. In addition, the inlet and outlet pressure difference of the main cooling water supply pump 520 can be obtained by using a pressure sensor installed at the inlet and outlet side of the main cooling water supply pump 520, the inlet and outlet pressure difference of the sub coolant supply pump 530 is It may be obtained by using a pressure sensor installed on the inlet side and the outlet side of the sub cooling water supply pump 530.

The first factor, which is changed under the control of the filter 265, among the first factors, may include the inlet / outlet pressure difference of the filter 265. At this time, the inlet and outlet pressure difference of the filter 265 can be obtained by a pressure sensor installed on the inlet and outlet side of the filter 265.

Among the first factors, the first factors changed according to the control of the condenser 220 and the cleaning facility 270 are included in the inlet / outlet pressure difference of the cleaning device 270, the inlet / outlet pressure difference of the tube 420, and the condenser 220. At least one of a degree of opening of the valves (not shown), and a temperature difference between the stream in which the valves are installed and the condenser 220. At this time, the inlet and outlet pressure difference of the cleaning equipment 270 can be obtained by a pressure sensor installed on the inlet and outlet side of the cleaning equipment 270, the inlet and outlet pressure difference of the tube 420 is the inlet side and It can be obtained by a pressure sensor installed on the outlet side.

Among the first factors, the first factors changed according to the control of the discharge pump 280 may include a pressure difference between the outlet pressure of the discharge pump 280 and the internal pressure of the condenser 220. At this time, the outlet pressure of the discharge pump 280 is obtained by a pressure sensor installed on the outlet side of the discharge pump 280, the internal pressure of the condenser 220 is obtained by a pressure sensor installed in the condenser 220. The data collector 610 may obtain a pressure difference between the outlet pressure of the discharge pump 280 and the internal pressure of the condenser 220 by calculating a difference between the pressure values obtained by the two pressure sensors.

Among the first factors, the first factors changed under the control of the water purification equipment 290 may include a pressure difference between the outlet pressure of the water purification equipment 290 and the internal pressure of the condenser 220. At this time, the outlet pressure of the water purification equipment 290 is obtained by a pressure sensor installed on the outlet side of the water purification equipment 290, the internal pressure of the condenser 220 is obtained by a pressure sensor installed in the condenser 220. The data collector 610 may obtain a pressure difference between the outlet pressure of the water purification equipment 290 and the internal pressure of the condenser 220 by calculating a difference between the pressure values obtained by the two pressure sensors.

On the other hand, the second factors independent and uncontrollable from each of the installations 250 to 295 include the coolant temperature, the square of the coolant temperature, the cube of the coolant temperature, the flow rate of the working fluid discharged from the turbine 210, and the turbine 210. It may include at least one of the output amount of. In this case, the cooling water temperature refers to the inflow temperature of the cooling water supplied to the cooling water supply facility 260, and may be obtained by sensing the temperature of the cooling water flowing into the cooling water supply facility 260 using a temperature sensor. The flow rate of the working fluid discharged from the turbine 210 may be obtained by measuring by using a flow sensor installed at the output end of the turbine 210.

On the other hand, the data collection unit 610 stores the sensing value collected for each factor. In this case, the data collection unit 610 may discard the sensing values that fall outside the predetermined upper and lower limits among the sensing values collected for each factor.

The modeling unit 620 models the vacuum model for predicting the vacuum of the condenser 220 by learning the sensing values of the first factors and the second factors obtained by the data collector 610 through big data analysis.

Specifically, the modeling unit 620 learns the sensing values of the first factors and the second factors obtained by the data collector 610 through big data analysis, thereby regression coefficients for each of the first and second factors. Then, to generate a vacuum model in the form of multiplying the calculated regression coefficient to each factor.

In one embodiment, the vacuum model modeled by the modeling unit 620 multiplies the regression coefficients calculated for each of the first factor and the second factor to the first factor and the second factor, and then adds up the multiplied results. It can be defined in the form. At this time, all of the above-described first factor and second factors may be included in the vacuum degree model, but some of the first factor and the second factor may not be applied to the vacuum degree model according to a user's selection.

As described above, according to the present invention, the vacuum degree model used for calculating the vacuum degree of the condenser 220 is not only a variable for the temperature or flow rate of the coolant but also a variable for a plurality of factors that affect the vacuum degree of the condenser 220. Since the factors are also reflected in the regression coefficient applied differently depending on the degree of influence on the degree of vacuum, it is possible to accurately predict the degree of vacuum of the condenser 220 that changes according to the surrounding situation.

The current vacuum degree predicting unit 630 detects a sensing value sensed at the present time among the sensing values of the first factors collected by the data collector 610 and a sensing value acquired at the present time among the sensing values of the second factors. The current vacuum degree of the condenser 220 is predicted by substituting the vacuum degree model.

The optimum vacuum predictor 640 estimates the optimum vacuum degree of the condenser 220 by substituting the sensing value obtained at the present time among the reference values selected for each of the first factors and the sensing values of the second factors into the vacuum model. In this case, the reference value selected for each of the first factors may be selected as one of the sensing values collected for each of the first factors by the data collector 610 for a predetermined period in the past.

In one embodiment, the optimum vacuum degree predicting unit 640 determines the sensing value at the time when the highest vacuum degree is achieved among the sensing values collected in the past for each of the first factors as a reference value for the first factor value. Can be.

The vacuum degree controller 650 adjusts the vacuum degree of the condenser 220 by using the current degree of vacuum predicted by the current degree of vacuum predictor 630 and the optimum degree of vacuum predicted by the optimum degree of vacuum predictor 640. As illustrated in FIG. 6, the vacuum degree controller 650 includes a vacuum degree improvement amount calculator 652 and a target factor selector 654.

The vacuum degree improvement amount calculator 652 calculates the difference between the current vacuum degree predicted by the current vacuum degree predictor 630 and the optimum vacuum degree predicted by the optimum vacuum degree predictor 640 to calculate the vacuum degree improvement amount.

The target factor selector 654 selects an adjustable target factor to achieve the degree of vacuum degree improvement among the first factors. The target factor selector 654 controls the facilities 250-295 on which the selected target factor depends so that the current vacuum degree of the condenser 220 follows the optimal vacuum degree of the condenser 220. In detail, when the target factor is selected, the target factor selector 654 performs maintenance or cleaning of the facilities 250 to 295 to which the selected target factor depends, or operates the facilities 250 to 295 to which the selected target factor depends. By changing the state (eg, change in pressure, etc.), the current vacuum degree of the condenser 220 can follow the optimum vacuum degree of the condenser 220.

For example, the target factor selector 654 may increase the flow rate of the main coolant by adjusting the pressure of the main coolant supply pump 520 when the main coolant flow rate is selected as the target factor.

As another example, the target factor selector 654 performs maintenance of the cleaning facility 270 when the inlet / outlet pressure difference of the cleaning facility 270 is selected as the target factor to thereby optimize the current vacuum degree of the condenser 220. It is possible to follow the degree of vacuum.

As another example, the target factor selector 654 may perform the cleaning of the tube 420 or the coolant reservoir 430 when the difference between the inlet and outlet pressures of the plurality of tubes 420 is selected as the target factor. May follow the optimum degree of vacuum of the condenser 220.

In the above-described embodiment, the target factor selector 654 selects a target factor and directly controls the equipments 250 to 295 to which the selected target factor depends. In another embodiment, the target factor selector ( 654 may provide the user with a target factor so that the user can directly control the facilities 250-295 to which the target factor depends. For example, the target factor selector 654 may guide the user of the filter cleaning of the heat exchanger included in the target factor and the vacuum pump 250 when the pressure difference of the coolant passing through the vacuum pump 250 is selected as the target factor. Can be.

In an exemplary embodiment, the target factor selector 654 may multiply the regression coefficient set for each first factor by the difference between the sensing value and the reference value at the current point in time for each of the first factors. Hereinafter, the "upgradable vacuum degree" may be calculated, and the target factors may be sequentially selected according to the order in which the increaseable vacuum degree calculated for each first factor is large.

According to this embodiment, the target factor selector 654 selects the first factor having the largest upliftable vacuum degree among the first factors as the target factor, and controls the equipment on which the first factor is dependent to improve the vacuum degree. Check whether it is achieved, and if not, select as the target factor the first factor whose ascendable vacuum degree is among the first factors and control whether the vacuum factor is achieved by controlling the equipment on which the first factor depends. Check it. The target factor selector 654 selects the target factor until the degree of vacuum improvement is achieved and controls the equipments to which the selected target factor depends.

As described above, according to the present invention, in addition to the coolant temperature or the coolant flow rate, it is possible to accurately predict the current vacuum degree of the condenser 220 which changes according to various operating condition changes, and the factor that the current vacuum degree can be controlled to follow the optimum vacuum degree. The efficiency of the turbine 210 may also be improved by selecting and guiding the user or directly controlling the factor dependent equipment so that the condenser 220 may be operated with the optimum degree of vacuum.

In addition, according to the present invention, the maintenance schedule of the facilities 250 to 295 may be adjusted so that the condenser 220 maintains an optimum degree of vacuum.

Hereinafter, a control method of a discharge working fluid cooling system of a turbine according to an embodiment of the present invention will be described with reference to FIG. 7.

7 is a flowchart showing a control method of the discharge working fluid cooling system of the turbine according to an embodiment of the present invention. The control method of the discharge working fluid cooling system of the turbine shown in FIG. 7 may be applied to the discharge working fluid cooling system of the turbine shown in FIG. 2, and may be performed by the control device shown in FIG. 2.

First, the control device 240 is dependent on a plurality of facilities (250 to 295) for performing the condensation function of the condenser 220 to the first factors and each equipment (250 to 295) changed according to the state of each equipment A vacuum degree model composed of independent second factors is modeled (S700).

In one embodiment, the first factors are the pressure difference of the cooling water passing through the vacuum pump 250 for adjusting the internal pressure of the condenser 220, the pressure of the internal pressure of the condenser 220 and the inlet pressure of the vacuum pump 250 The first set value set for each cleaning transition period of the vacuum pump 250, the main coolant flow rate supplied by the main coolant supply pump 520, the square value of the main coolant flow rate, the cubic value of the main coolant flow rate, and the sub coolant supply. Sub coolant flow rate supplied by the pump 530, inlet and outlet pressure difference of the main coolant supply pump 520, inlet and outlet pressure difference of the sub coolant supply pump 530, inlet and outlet pressure difference of the filter 265 to filter the coolant, condenser The inlet and outlet pressure difference of the cleaning equipment 270 for cleaning the 220, the inlet and outlet pressure difference of the tube 420 included in the condenser 220, the opening ratio of the valves included in the condenser 220, the condensed working fluid Of the discharge pump 280 to supply the facility The pressure difference between the inlet pressure and the internal pressure of the condenser 220 and the outlet pressure of the water purification equipment 290 which purifies the working fluid flowing into or out of the condenser 220 and the internal pressure of the condenser 220. It may include at least one of the pressure difference of.

The second factors may also include at least one of coolant temperature, square of coolant temperature, cube of coolant temperature, flow rate of working fluid discharged from the turbine, and output of the turbine.

Specifically, the control device 240 is a sensing value of the first factors and the second factors required for calculating the degree of vacuum of the condenser 220 from the sensors (not shown) installed in the discharge working fluid cooling system 200 of the turbine. When the collected first and second factors are sensed by learning through big data analysis, regression coefficients are calculated for each of the first and second factors, and the calculated regression coefficients are multiplied by the factors. Create a degree of vacuum model.

In one embodiment, the controller 240 multiplies the regression coefficients calculated for each of the first factor and the second factor to the first factor and the second factor, respectively, and generates a vacuum model of the sum of all the multiplication results. can do. In this case, although all of the collected first factor and second factors may be included in the vacuum degree model, some of the first factor and the second factor may not be applied to the vacuum degree model according to a user's selection.

As described above, according to the present invention, the vacuum degree model used for calculating the vacuum degree of the condenser 220 is not only a variable for the temperature or flow rate of the coolant but also a variable for a plurality of factors that affect the vacuum degree of the condenser 220. Since the factors are also reflected in the regression coefficient applied differently depending on the degree of influence on the degree of vacuum, it is possible to accurately predict the degree of vacuum of the condenser 220 that changes according to the surrounding situation.

Subsequently, the controller 240 predicts the current vacuum degree of the condenser 220 by substituting the sensing values of the first factors and the second factors sensed at the present time into the vacuum degree model (S710).

Subsequently, the controller 240 estimates the optimum vacuum degree of the condenser 220 by substituting the reference value selected from the sensing values collected during the predetermined period for each of the first factors and the sensing values of the second factors into a vacuum model. (S720).

In one embodiment, the reference value selected for each of the first factors may be determined as a sensing value at a time when the highest degree of vacuum has been achieved among the sensing values collected in the past for each of the first factors.

Thereafter, the control device 240 calculates the vacuum degree improvement amount based on the current vacuum degree and the optimum vacuum degree (S730). In one embodiment, the controller 240 may calculate the vacuum degree improvement amount by subtracting the current vacuum degree from the optimum vacuum degree.

Thereafter, the control device 240 selects an adjustable target factor to achieve the degree of vacuum improvement among the first factors (S740). In one embodiment, the control device 240 calculates the amount of riseable vacuum degree through the adjustment of the first factor for each first factor, and sequentially targets in order of increasing the degree of vacuum degree among the first factors You can choose a factor.

In this case, the increaseable vacuum degree for each first factor may be calculated by multiplying a regression coefficient set for each first factor by a difference between a sensing value and a reference value at the present time for each of the first factors.

According to this embodiment, the control device 240 selects a first factor having the largest upliftable vacuum degree among the first factors as a target factor, and controls whether the vacuum factor is improved by controlling the equipment on which the first factor depends. If it is not achieved, if it is not achieved, select the first factor whose ascendable vacuum degree is among the first factors as a target factor and control whether or not the vacuum degree improvement amount is achieved by controlling the equipment on which the first factor depends. . The controller 240 selects the target factor until the degree of vacuum improvement is achieved.

Thereafter, the controller 240 controls the facilities 250 to 295 on which the selected target factor depends, and adjusts the vacuum degree of the condenser (S750). Accordingly, the current degree of vacuum of the condenser 220 follows the optimum degree of vacuum of the condenser 220.

Specifically, when the target factor is selected, the control device 240 performs maintenance or cleaning of the facilities 250 to 295 on which the selected target factor is dependent, or the operation state of the equipment 250 to 295 on which the selected target factor depends. For example, by changing the pressure, etc.), the current vacuum degree of the condenser 220 can follow the optimum vacuum degree of the condenser 220.

For example, the controller 240 may increase the flow rate of the main coolant by adjusting the pressure of the main coolant supply pump 520 when the main coolant flow rate is selected as the target factor. As another example, when the difference between the inlet and outlet pressure of the cleaning equipment 270 is selected as the target factor, the control device 240 performs maintenance of the cleaning equipment 270 so that the current vacuum degree of the condenser 220 may be adjusted to the optimum vacuum degree of the condenser 220. You can follow. As another example, the controller 240 performs the cleaning of the tube 420 or the coolant reservoir 430 when the inlet / outlet pressure difference of the plurality of tubes 420 is selected as the target factor. The optimum vacuum degree of 220 may be followed.

In the above-described embodiment, the controller 240 selects the target factor, and it is described that the selected target factor directly controls the equipments 250 to 295 to which the selected target factor depends. In another embodiment, the controller 240 is selected. Providing the target factor to the user may allow the user to directly control the facilities 250 to 295 on which the target factor depends.

For example, when the pressure difference of the coolant passing through the vacuum pump 250 is selected as the target factor, the control device 240 may guide the user to clean the filter of the heat exchanger included in the target factor and the vacuum pump 250. .

Those skilled in the art to which the present invention pertains will understand that the above-described present invention can be implemented in other specific forms without changing the technical spirit or essential features.

For example, in the modified embodiment, the power generation system including the turbine 210, the condenser 220, and the control device 240 may be configured.

Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

200: turbine discharge working fluid cooling system 210: turbine
220: condenser 230: drive device
240: control device 250: vacuum pump
260: cooling water supply equipment 265: filter
270: cleaning equipment 280: discharge pump
290: water purification equipment 295: heat exchanger
610: data collector 620: modeling unit
630: current vacuum degree predicting unit 640: optimum vacuum degree Yetsbu
650: vacuum degree control unit 652: vacuum degree improvement amount calculation unit
654: target factor selector

Claims (20)

A condenser for condensing the working fluid discharged from the turbine for driving the generator with cooling water;
A driving device composed of a plurality of devices to operate the capacitor;
Sensing values collected over a predetermined period of time for each of the first factors in the vacuum model including first factors that are dependent on the plurality of facilities and change according to the state of each facility and second factors that are independent of each facility. An optimum vacuum predicting unit which substitutes a reference value, which is any one of the values, and predicts an optimum vacuum degree of the condenser by substituting the sensing values of the second factors sensed at each point in time for each of the second factors;
A current vacuum degree predicting unit predicting a current vacuum degree of the condenser by substituting the sensing values of the first factors and the second values sensed at the present time into the vacuum degree model; And
A vacuum degree control unit for adjusting the vacuum degree of the condenser using the optimum vacuum degree, The vacuum degree control unit,
A vacuum degree improving amount calculating part that calculates a difference between the current vacuum degree and the optimum vacuum degree and calculates a vacuum degree improving amount; And
Selecting an adjustable target factor to achieve the vacuum degree improvement amount of the first factor, and comprises a target factor selection unit for controlling the vacuum degree of the condenser by controlling the equipment dependent on the selected target factor Turbine exhaust working fluid cooling system. delete delete The method of claim 1,
The target factor selector calculates a riseable vacuum degree by adjusting the first factor, and selects the target factor according to the order in which the liftable vacuum degree is greater among the first factors. Working fluid cooling system. The method of claim 1,
The target factor selector may calculate a possible vacuum degree amount for each first factor by multiplying a regression coefficient set for each first factor by a difference between a sensing value and a reference value at the present time for each of the first factors. Turbine discharge working fluid cooling system. The method of claim 1,
And the vacuum degree model is a model in which a regression coefficient set for each of the first and second factors is added to multiply the results of the first factor and the second factor, respectively. The method of claim 1,
The plurality of facilities,
It includes a vacuum pump for adjusting the internal pressure of the condenser to make a vacuum inside the condenser,
The first factors include at least one of a pressure difference of the cooling water passing through the vacuum pump, a pressure difference between the internal pressure of the condenser and the inlet pressure of the vacuum pump, and a first set value set for each cleaning transition period of the vacuum pump. Discharge working fluid cooling system of the turbine, characterized in that. The method of claim 1,
The plurality of facilities include a main cooling water supply pump for supplying the cooling water to at least one of the condenser and a heat exchanger for cooling the cooling water through a main stream, and a sub cooling water supply pump for supplying the cooling water to the heat exchanger through a sub stream. Including a cooling water supply comprising a,
The first factors may include a main coolant flow rate controlled by the main coolant supply pump, a square value of the main coolant flow rate, a cubic value of the main coolant flow rate, a sub coolant flow rate controlled by the sub coolant supply pump, and the main coolant And at least one of an inlet and an outlet pressure difference of a feed pump, and an inlet and outlet pressure difference of the sub cooling water supply pump. The method of claim 1,
The plurality of facilities includes a filter for removing suspended solids from the cooling water,
And said first factors comprise inlet and outlet pressure differentials of said filter. The method of claim 1,
The condenser includes a plurality of tubes through which coolant passes, and a coolant reservoir in which coolant supplied to the plurality of tubes and coolant discharged from the plurality of tubes are stored.
The plurality of facilities includes a cleaning facility for cleaning the plurality of tubes,
And the first factors include at least one of an inlet and an outlet pressure difference of the cleaning equipment, an inlet and outlet pressure difference of the tube, and an opening ratio of valves included in the condenser. The method of claim 1,
The plurality of facilities may include at least one of a discharge pump for supplying the working fluid condensed by the condenser to another facility and the plurality of facilities for purifying the working fluid flowing into or out of the condenser. Including,
The first factors are discharge operation of the turbine, characterized in that at least one of the pressure difference between the inlet pressure of the discharge pump and the internal pressure of the condenser, the outlet pressure of the water purification equipment and the internal pressure of the condenser. Fluid cooling system. The method of claim 1,
Wherein the second factors include at least one of the coolant temperature, the square of the coolant temperature, the cube of the coolant temperature, the flow rate of the working fluid discharged from the turbine, and the output of the turbine. Working fluid cooling system. Predetermined period of time for each of the first factors in the degree of vacuum model consisting of a first factor that is dependent on a plurality of equipment for performing the condensation function of the condenser and changes according to the state of each equipment and the second factors independent of each equipment Predicting an optimum vacuum degree of the condenser by substituting the reference value selected from the sensing values collected during the detection and the sensing values of the second factors sensed at the present time;
Selecting an adjustable target factor to achieve a degree of vacuum improvement determined based on the optimum degree of vacuum among the first factors; And
And controlling the vacuum degree of the condenser by controlling the facility on which the selected target factor depends. The method of claim 13,
Predicting the current vacuum degree of the condenser by substituting the sensing values of the first factors and the second factors sensed at the present time into the vacuum degree model;
In the step of selecting the target factor, the vacuum degree improvement amount is controlled by the discharge working fluid cooling system of the turbine, characterized in that determined by the difference between the current vacuum degree and the optimum vacuum degree. The method of claim 13,
In the step of selecting the target factor, the riseable vacuum degree amount can be calculated by adjusting the first factor, and the target factor is selected according to the order in which the increaseable vacuum degree is greater among the first factors. Method for controlling the discharge working fluid cooling system of the turbine. The method of claim 13,
In the selecting of the target factor, a regression coefficient set for each first factor is multiplied by a difference between a sensing value and a reference value at the current time point for each of the first factors to calculate an increaseable vacuum degree for each first factor. A method for controlling the discharge working fluid cooling system of a turbine, characterized in that the. The method of claim 13,
The first factors are first set by the pressure difference of the cooling water passing through the vacuum pump for adjusting the internal pressure of the condenser, the pressure difference between the internal pressure of the condenser and the vacuum pump inlet pressure, and the cleaning period of the vacuum pump. Value, the main coolant flow rate supplied by the main coolant supply pump, the square value of the main coolant flow rate, the cubic value of the main coolant flow rate, the sub coolant flow rate supplied by the sub coolant supply pump, the inlet / outlet pressure of the main coolant supply pump The difference between the inlet and outlet pressure of the sub-cooling water supply pump, the inlet and outlet pressure difference of the filter for filtering the cooling water, the inlet and outlet pressure difference of the cleaning equipment for cleaning the condenser, the inlet and outlet pressure difference of the tube included in the condenser, the condenser Opening ratio of the valves used, discharge to supply the working fluid condensed by the condenser to other equipment At least one of the pressure difference between the inlet pressure of the pump and the internal pressure of the condenser, and the outlet pressure of the water purification equipment for purifying the working fluid flowing into or out of the condenser and the internal pressure of the condenser A method for controlling the discharge working fluid cooling system of a turbine, characterized in that the. The method of claim 13,
The second factors include at least one of a coolant temperature for cooling the working fluid supplied from the turbine, a square of the coolant temperature, a cube of the coolant temperature, a flow rate of the working fluid discharged from the turbine, and an output of the turbine. A method for controlling the discharge working fluid cooling system of a turbine, characterized in that the. Each of the first factors in the vacuum model consists of first factors that are dependent on a plurality of installations for the operation of the condenser to condense the working fluid and change according to the state of each installation and second factors independent of each installation. Including a reference value, which is any one selected from the sensing values collected for a predetermined period of time, and for each of the second factor includes an optimum vacuum predictor for predicting the optimum vacuum degree of the condenser by substituting the sensed value at the present time; ,
The vacuum model is a discharge fluid cooling of the turbine, characterized in that the model of the form of adding the regression coefficient set for each of the first factor and the second factor multiplied by the first factor and the second factor, respectively. system. A turbine for driving a generator; And
In the vacuum degree model consisting of a first factor that is dependent on a plurality of equipment for the operation of the condenser for condensing the working fluid discharged from the turbine changes according to the state of each equipment and the second factors independent of each equipment Cooling that predicts the optimum vacuum degree of the condenser by substituting a reference value, which is any one selected among sensing values collected for a predetermined period, for each one factor, and a sensing value sensed at the present time for each of the second factors. Including a device,
The vacuum model is a power generation system characterized in that the model of the form of adding the results of the regression coefficient set for each of the first factor and the second factor multiplied by the first factor and the second factor, respectively.

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