JP7721590B2 - Condenser condition prediction device - Google Patents

Description

An embodiment of the present invention relates to a condenser state prediction device.

One type of condenser installed in steam turbine equipment is a surface condenser. This surface condenser has multiple tubes through which cooling water flows. The steam discharged from the turbine is cooled by coming into contact with these tubes. Note that, hereafter, surface condensers will be simply referred to as condensers.

Condensers use large amounts of cooling water to cool the steam. For this reason, seawater, lake water, river water, etc. are generally used as cooling water. Of these, seawater is used in many facilities.

The inner surfaces of condenser tubes corrode and become dirty due to substances contained in the cooling water. Corrosion of the inner surfaces of the tubes causes the tube wall thickness to decrease (thinning). In addition, dirt on the inner surfaces of the tubes reduces the heat transfer coefficient, resulting in a decrease in condenser performance. The decrease in tube wall thickness and the decrease in condenser performance progress over time.

Traditionally, the progression of condenser tube thinning could be detected during periodic inspections, which require the shutdown of steam turbine equipment. However, even if a periodic inspection reveals that condenser tube thinning has exceeded a critical value, the steam turbine equipment must be shut down for an extended period of time, as it generally takes time to repair the condenser and procure parts. Furthermore, changes in performance resulting from condenser tube replacement can only be identified by operating the condenser. For this reason, it has traditionally been difficult to predict the impact of repairs on condenser performance and condition.

Japanese Unexamined Patent Publication No. 135759/1983 Japanese Patent Application Laid-Open No. 2004-145496 Japanese Patent Application Laid-Open No. 2019-79275

As such, in the past, the progression of condenser wall thinning could only be detected by inspection, which required shutting down operations. Furthermore, even if the condenser was repaired as a result of the inspection, it was difficult to predict changes in performance or condition.

The problem that this invention aims to solve is to provide a condenser state prediction device that can recognize state prediction information related to condenser performance and tube thinning based on operating conditions.

The condenser state prediction device of the embodiment includes a display information generation unit that generates at least one of first screen display information that displays performance information including the heat transfer coefficient of the condenser predicted based on measured measurement information or input information on a display unit for each tube group of tubes into which cooling water is introduced in the condenser , and second screen display information that displays remaining wall thickness information indicating the remaining percentage of the wall thickness of the tubes predicted based on the input information on a display unit for each tube group .

1 is a system diagram showing a configuration of a steam turbine facility equipped with a condenser state prediction device according to an embodiment; 1 is a front view showing the configuration of a condenser targeted by a condenser state prediction device according to an embodiment. 1 is a side view showing the configuration of a condenser targeted by a condenser state prediction device according to an embodiment; 1 is a side view showing the configuration of a condenser targeted by a condenser state prediction device according to an embodiment; 1 is a schematic diagram showing a cross section of a tube bank of a condenser targeted by a condenser state prediction device according to an embodiment; 1 is a block diagram showing a functional configuration of a condenser state prediction device according to an embodiment; 3 is a diagram illustrating an example of screen display information generated by the condenser state prediction device according to the embodiment. FIG. 3 is a diagram illustrating an example of screen display information generated by the condenser state prediction device according to the embodiment. FIG. 10 is a diagram illustrating another example of screen display information generated by the condenser state prediction device according to the embodiment. FIG. 10 is a diagram illustrating another example of screen display information generated by the condenser state prediction device according to the embodiment. FIG. 4 is a flowchart showing the operation of a calculation unit of the condenser state prediction device according to the embodiment. 4 is a flowchart showing the operation of a calculation unit of the condenser state prediction device according to the embodiment. 3 is a flowchart showing the overall operation of the condenser state prediction device according to the embodiment. 3 is a diagram illustrating an example of screen display information for receiving input to the condenser state prediction device according to the embodiment. FIG. 3 is a diagram illustrating an example of screen display information for receiving input to the condenser state prediction device according to the embodiment. FIG. 3 is a diagram illustrating an example of screen display information for receiving input to the condenser state prediction device according to the embodiment. FIG. 3 is a diagram illustrating an example of screen display information for receiving input to the condenser state prediction device according to the embodiment. FIG. 3 is a diagram illustrating an example of screen display information for receiving input to the condenser state prediction device according to the embodiment. FIG. FIG. 2 is a diagram illustrating an example of basic specification data of the condenser state prediction device according to the embodiment. 3 is a diagram illustrating an example of screen display information for receiving input to the condenser state prediction device according to the embodiment. FIG. FIG. 2 is a diagram illustrating an example of an inspection history of the condenser state prediction device according to the embodiment. 3 is a diagram illustrating an example of screen display information for receiving input to the condenser state prediction device according to the embodiment. FIG. 5A and 5B are diagrams illustrating an example of a calculation result of the condenser state prediction device according to the embodiment. 10 is a diagram illustrating an example of screen display information of a calculation result of the condenser state prediction device according to the embodiment. FIG. 4 is a flowchart illustrating an example of a user's operation of the condenser state prediction device according to the embodiment. 10 is a diagram illustrating an example of screen display information indicating a wall remaining rate generated by a condenser state prediction device according to an embodiment. FIG. 10 is a diagram illustrating an example of screen display information indicating a wall remaining rate generated by a condenser state prediction device according to an embodiment. FIG. 10 is a diagram showing an example of screen display information showing the contribution rate of overall heat transfer coefficient generated by the condenser state prediction device of the embodiment; FIG. 10 is a diagram showing an example of screen display information showing the contribution rate of overall heat transfer coefficient generated by the condenser state prediction device of the embodiment; FIG.

The following describes an embodiment of the present invention with reference to the drawings.

Figure 1 is a system diagram that schematically illustrates the configuration of a steam turbine facility 1 equipped with a condenser state prediction device 18 according to an embodiment. As shown in Figure 1, the steam turbine facility 1 includes a boiler 10, a high-pressure turbine 11, a reheater 12, an intermediate-pressure turbine 13, a low-pressure turbine 14, a generator 15, a condenser 16, a feedwater pump 17, and a condenser state prediction device 18. Here, the condenser 16 is the facility for which the condenser state prediction device 18 predicts the performance and state of the condenser, such as thinning of the cooling water pipes.

The boiler 10 heats feedwater to generate steam and outputs the steam to the main steam pipe 20. The high-pressure turbine 11 is rotated by steam introduced from the main steam pipe 20 and outputs the steam to the low-temperature reheat pipe 21. The reheater 12 reheats the steam introduced from the low-temperature reheat pipe 21 and outputs the steam to the high-temperature reheat pipe 22.

The intermediate-pressure turbine 13 is rotated by steam introduced from the high-temperature reheat pipe 22 and discharges the steam into the crossover pipe 23. The low-pressure turbine 14 is rotated by steam introduced from the crossover pipe 23 and discharges the steam into the exhaust pipe 24. The generator 15 generates electricity by being driven by the high-pressure turbine 11, the intermediate-pressure turbine 13, and the low-pressure turbine 14.

The condenser 16 condenses the steam introduced through the exhaust pipe 24 to produce condensed water. The feedwater pump 17 supplies the condensed water from the condenser 16 as feedwater to the boiler 10 via the feedwater pipe 25. The condenser 16 is a surface condenser. Details of the configuration of the condenser 16 will be described later.

The condenser state prediction device 18 is a computing device that evaluates the state of the condenser, such as its performance and the degree of wall thinning. The condenser state prediction device 18 can be realized, for example, by a computer device.

The steam turbine equipment 1 further includes a cooling water temperature detector 30 and a cooling water temperature detector 31 so that the condenser state prediction device 18 can evaluate the state of the condenser 16 and predict thinning of its tubes. The cooling water temperature detector 30 is a temperature sensor that detects the temperature T1 of the cooling water introduced into the tubes of the condenser 16 (cooling water inlet temperature). The cooling water temperature detector 30 is provided at a location where it can detect the temperature of the cooling water introduced into each tube. Multiple cooling water temperature detectors 30 may be provided. For example, the cooling water temperature detector 30 may be provided in introduction box 16BinA and introduction box 16BinB, as described below. Furthermore, the cooling water temperature detector 30 may be provided in each of the multiple tubes through which cooling water flows, which are provided in the condenser 16, as described below.

The cooling water temperature detector 31 is a temperature sensor that detects the temperature T2 of the cooling water discharged from the condenser 16 (cooling water outlet temperature). The cooling water temperature detector 31 is provided in a location that can detect the temperature of the cooling water discharged from the pipes provided in the condenser 16. Multiple cooling water temperature detectors 31 may be provided. For example, as described below, the cooling water temperature detector 31 may be provided at the discharge outlet 16WoutA of the discharge box 16BoutA and the discharge outlet 16WoutB of the discharge box 16BoutB. Furthermore, the cooling water temperature detector 31 may be provided, for example, in each pipe provided in the condenser 16.

The cooling water temperature detector 30 outputs a detection signal indicating the detected cooling water inlet temperature T1 to the condenser state prediction device 18. In addition, the cooling water temperature detector 31 outputs a detection signal indicating the detected cooling water outlet temperature T2 to the condenser state prediction device 18. The cooling water temperature detector 30 and the cooling water temperature detector 31 are composed of, for example, a thermocouple. The cooling water inlet temperature T1 and the cooling water outlet temperature T2 are measurement information measured by the cooling water temperature detector 30 and the cooling water temperature detector 31.

The steam turbine equipment 1 also includes a condenser pressure detector 32 that detects the condenser pressure P of the condenser 16 so that the condenser state prediction device 18 can predict the state evaluation of the condenser 16. The condenser pressure detector 32 outputs a detection signal indicating the detected condenser pressure P to the condenser state prediction device 18.

Here, Figure 2 is a front view showing the configuration of a condenser 16 whose performance and wall thinning are predicted by a condenser state prediction device 18 according to an embodiment. Figures 3 and 4 are side views showing the configuration of a condenser 16 whose performance and wall thinning are predicted by a condenser state prediction device 18 according to an embodiment. As shown in Figures 2 to 4, the condenser 16 has a housing 16cav that is approximately rectangular.

As shown in Figures 2 to 4, the housing 16cav has on one side thereof inlet boxes 16BinA and 16BinB into which cooling water is introduced. Inlet boxes 16BinA and 16BinB have inlet ports 16WinA and 16WinB, respectively, through which cooling water is introduced. Inlet ports 16WinA and 16WinB receive cooling water from the lower side of the housing 16cav. In addition, the housing 16cav has on its other side outlet boxes 16BoutA and 16BoutB into which cooling water discharged from each pipe 16P flows. Outlet boxes 16BoutA and 16BoutB have outlet ports 16WoutA and 16WoutB, respectively, through which cooling water is discharged. The outlets 16WoutA and 16WoutB discharge cooling water via the discharge pipe 16Wout, for example, toward the front or rear of the housing 16cav. Inside the housing 16cav, multiple pipes 16P are arranged approximately horizontally between the inlet boxes 16BinA and 16BinB and the outlet boxes 16BoutA and 16BoutB.

As shown in Figures 3 and 4, the interior of the housing 16cav is divided into a front side and a rear side, and multiple pipes 16P are grouped (grouped) in each partitioned area into a front-side group 16PA and a rear-side group 16PB. Inlet box 16BinA and inlet box 16BinB correspond to groups 16PA and 16PB, respectively. That is, cooling water introduced into inlet box 16BinA is sent to pipes 16P of group 16PA. Similarly, cooling water introduced into inlet box 16BinB is sent to pipes 16P of group 16PB.

Discharge boxes 16BoutA and 16BoutB correspond to groups 16PA and 16PB, respectively. That is, cooling water that passes through pipe 16P of group 16PA is discharged from discharge port 16WoutA via discharge box 16BoutA. Similarly, cooling water that passes through pipe 16P of group 16PB is discharged from discharge port 16WoutB via discharge box 16BoutB.

Inlet box 16BinA and inlet box 16BinB are equipped with cooling water temperature detectors 30, which detect the cooling water inlet temperatures T1 of inlet box 16BinA and inlet box 16BinB. At least one cooling water temperature detector 30 is provided for each of inlet box 16BinA and inlet box 16BinB. Multiple cooling water temperature detectors 30 may also be provided for inlet box 16BinA and inlet box 16BinB. Instead of inlet box 16BinA and inlet box 16BinB, cooling water temperature detectors 30 may also be provided on the piping that supplies cooling water to inlet box 16BinA and inlet box 16BinB.

Discharge box 16BoutA and discharge box 16BoutB are equipped with cooling water temperature detectors 31, which detect the cooling water outlet temperatures T2 of discharge box 16BoutA and discharge box 16BoutB. At least one cooling water temperature detector 31 is provided for each of discharge box 16BoutA and discharge box 16BoutB. Alternatively, multiple cooling water temperature detectors 31 may be provided for discharge box 16BoutA and discharge box 16BoutB. Cooling water temperature detectors 31 may be provided for discharge outlets 16WoutA and 16WoutB instead of discharge box 16BoutA and discharge box 16BoutB. Furthermore, the coolant temperature detector 31 may be provided in the discharge pipe 16Wout, which discharges the coolant from each of the discharge ports 16WoutA and 16WoutB, instead of the discharge ports 16WoutA and 16WoutB.

Figure 5 is a schematic diagram showing a cross section perpendicular to the longitudinal direction of a tube 16P of the condenser 16 shown in Figures 2 to 4, whose performance and wall thinning are predicted by the condenser state prediction device 18 of an embodiment. Figure 5 shows one of groups 16PA and 16PB divided within the housing 16cav. The condenser 16 has a configuration in which multiple tubes 16P, through which cooling water flows in parallel, are arranged, for example, horizontally. As shown in Figure 5, the multiple tubes 16P of the condenser 16 are divided, arranged, and managed into multiple blocks (tube groups). The example shown in Figure 5 shows tube groups 16A1 and 16A2 at the top of Figure 5, tube groups 16A6 and 16A7 at the bottom, tube groups 16A3, 16A4, and 16A5 located between tube groups 16A1 and 16A2, and tube groups 16A8, 16A9, and 16A10 located between tube groups 16A6 and 16A7.

Cooling water introduced from inlet box 16BinA passes through pipe 16P of group 16PA, cools steam 16S, and is discharged to discharge box 16BoutA. Cooling water introduced from inlet box 16BinB passes through pipe 16P of group 16PB, cools steam 16S, and is discharged to discharge box 16BoutB. The cooling water temperature detector 30 detects, for example, the temperature of the cooling water introduced into inlet box 16BinA and inlet box 16BinB as the cooling water inlet temperature T1.

Here, if one cooling water temperature detector 30 is provided in each of introduction boxes 16BinA and 16BinB, the arithmetic mean value of the temperatures detected by each cooling water temperature detector 30 is taken as the cooling water inlet temperature T1. Furthermore, if multiple cooling water temperature detectors 30 are provided in each of introduction boxes 16BinA and 16BinB, the arithmetic mean value of the temperatures detected by each cooling water temperature detector 30 is taken as the cooling water inlet temperature T1.

The cooling water temperature detector 31 detects the temperature of the cooling water discharged from the pipe 16P as the cooling water outlet temperature T2. Here, if one cooling water temperature detector 31 is provided in each of the discharge boxes 16BoutA and 16BoutB, the arithmetic mean value of the temperatures detected by each cooling water temperature detector 31 is taken as the cooling water outlet temperature T2. Furthermore, if multiple cooling water temperature detectors 31 are provided in each of the discharge boxes 16BoutA and 16BoutB, the arithmetic mean value of the temperatures detected by the multiple cooling water temperature detectors 31 is taken as the cooling water outlet temperature T2.

The same applies when a coolant temperature detector 31 is provided at each of the outlets 16WoutA and 16WoutB. The arithmetic mean value of the coolant temperatures at the outlets 16WoutA and 16WoutB detected by the coolant temperature detector 31 is taken as the coolant outlet temperature T2. The same applies when multiple coolant temperature detectors 31 are provided at each of the outlets 16Wout and 16WoutB, and the arithmetic mean value of the temperatures detected by each of the multiple coolant temperature detectors 31 is taken as the coolant outlet temperature T2.

The casing 16cav has a steam inlet 16Sin on its top surface that connects to the exhaust pipe 24 of the steam turbine equipment 1, and a drain outlet 16Cout on its bottom surface that drains water condensed from the steam 16S. The steam 16S introduced from the exhaust pipe 24 is cooled by contact with the surfaces of the multiple pipes 16P, and condenses into water that accumulates at the bottom of the casing 16cav. The water that has accumulated at the bottom of the casing 16cav is discharged from the drain outlet 16Cout.

Next, we will explain the condenser state prediction device 18.

Figure 6 is a block diagram showing the functional configuration of the condenser state prediction device 18 according to an embodiment. As shown in Figure 6, the condenser state prediction device 18 includes a measurement data acquisition unit 41, a calculation unit 42, a user interface 43, and a storage unit 44. The condenser state prediction device 18 can be implemented, for example, by a computer device.

The measurement data acquisition unit 41 is an interface that acquires a detection signal indicating the cooling water inlet temperature T1 output from the cooling water temperature detector 30 and a detection signal indicating the cooling water outlet temperature T2 output from the cooling water temperature detector 31. The measurement data acquisition unit 41 acquires these detection signals at predetermined time intervals (e.g., one-hour intervals). The measurement data acquisition unit 41 converts the acquired detection signal indicating the cooling water inlet temperature T1 and the detection signal indicating the cooling water outlet temperature T2 into temperature information, and outputs this to the memory unit 44. The measurement data acquisition unit 41 also acquires the accumulated operating time of the steam turbine equipment 1 and outputs this to the memory unit 44.

Calculation unit 42 is a calculation block that evaluates condenser performance and predicts tube thinning. Calculation unit 42 loads a specified program from memory unit 44 into an internal memory area (not shown) and executes it to achieve its specified functions. Calculation unit 42 has a specification calculation unit 400, a heat transfer coefficient calculation unit 410, a thinning rate calculation unit 420, and a display information generation unit 430.

The specification calculation unit 400 is a calculation block that calculates basic data for the condenser 16, such as the tube inner diameter, heat transfer area, and flow rate. The overall heat transfer coefficient calculation unit 410 is a calculation block that calculates the overall heat transfer coefficient, cleanliness, and internal condenser pressure of the condenser 16. The wall-thinning rate calculation unit 420 is a calculation block that calculates the wall-thinning rate and remaining wall-thinning rate of the tubes 16P of the condenser 16. The specification calculation unit 400, overall heat transfer coefficient calculation unit 410, and wall-thinning rate calculation unit 420 output their calculation results to the calculation result storage unit 470 of the storage unit 44. The display information generation unit 430 is a calculation block that generates screen display information to be provided to the user via the user interface 43 based on the calculation results of the various calculation units and display templates stored in the template storage unit 480 (described below). The display information generation unit 430 also outputs the screen display information to the user interface 43 and the display information storage unit 490.

The screen display information may be in any format that can be displayed on the display unit serving as the user interface 43. An example of screen display information is HTML format, which makes it easy to prepare templates in advance.

Figure 7 shows an example of screen display information generated by the display information generation unit 430 of the condenser state prediction device 18 of an embodiment. In the example shown in Figure 7, the screen display information 300 includes a condenser state prediction result 330, a state prediction result summary 340, and a condenser tube bank layout diagram 350. The condenser state prediction result 330 includes two groups of performance information indicating the performance of the condenser 16: Group A (first calculated data) including cleanliness 332a, condenser internal pressure 334a, and overall heat transfer coefficient contribution rate 336a, and Group B (second calculated data) including cleanliness 332b, condenser internal pressure 334b, and overall heat transfer coefficient contribution rate 336b. In group A, the cleanliness 332a, condenser internal pressure 334a, and overall heat transfer coefficient contribution rate 336a indicate predicted values based on initial value (design value) data, while in group B, the cleanliness 332b, condenser internal pressure 334, and overall heat transfer coefficient contribution rate 336b indicate predicted values calculated based on newly input or acquired information. Note that the performance information of the condenser 16 may also include the overall heat transfer coefficient.

The cleanliness levels 332a, 332b and the condenser internal pressures 334a, 334b are each displayed, for example, as semicircular graphs, with predicted values also displayed. In the example shown in Figure 7, the values indicating the cleanliness levels 332a, 332b are displayed as percentages. The overall heat transfer coefficient contribution rates 336a, 336b are shown, for example, as bar graphs, and represent the ratio (contribution rate) of the average overall heat transfer coefficient for each tube group 16PA or 16PB of the condenser 16. In other words, the bar graphs show the average overall heat transfer coefficient for each tube group within a group divided by the average overall heat transfer coefficient for all tubes in the condenser 16, expressed as a percentage, as the overall heat transfer coefficient contribution rate.

In the example shown in Figure 7, the bar graphs for tube groups whose contribution rate to the overall heat transfer coefficient exceeds 100% are shown in color (shaded areas in the figure). In this way, in the example of screen display information 300 shown in Figure 7, the contribution rate to the overall heat transfer coefficient is shown in bar graph form for each tube group, and colors are used to indicate whether or not the contribution rate exceeds the standard of 100%.

The status prediction result summary 340 includes the data on which the prediction value was calculated and the numerical value of the prediction result as display content.

The tube group layout diagram 350 shows a schematic representation of the arrangement of the tube groups. The tube group layout diagram 350 shows the arrangement of the tube groups of the condenser. The tube group layout diagram 350 is configured to be able to selectively display either group 16PA or group 16PB, which are divided within the housing 16cav.

Here, Figure 8 shows another example of screen display information generated by the display information generation unit 430 of the condenser state prediction device 18 of this embodiment. In the example of the tube bank arrangement diagram 351 of the screen display information 301 shown in Figure 8, tube banks whose contribution rate of overall heat transfer coefficient exceeds 100% are colored (shaded areas in the diagram). In this case, for example, based on the second calculation data, tube banks whose contribution rate of overall heat transfer coefficient exceeds 100% are colored (shaded areas in the diagram). In this way, the tube bank arrangement diagram 351 may be color-coded to indicate whether or not the standard of 100% is exceeded, similar to a bar graph display. Alternatively, it may simply function as a representation of the tube bank arrangement, like the tube bank arrangement diagram 350.

Figure 9 shows another example of screen display information generated by the display information generation unit 430 of the condenser state prediction device 18 of this embodiment. The example shown in Figure 9 displays the tube remaining wall thickness ratio 360 as screen display information 302. The remaining wall thickness ratio is the ratio of the remaining tube wall thickness for each tube group within the group to the tube wall thickness at the initial value (design value) for each tube group within the group. In other words, the remaining wall thickness ratio is a value expressed as a percentage obtained by dividing the remaining wall thickness calculated based on the wall thickness reduction rate by the tube wall thickness at the initial value.

In the example shown in FIG. 9, the screen display information 302 also includes group A (first calculated data) and group B (second calculated data), with group A showing a wall thickness remaining ratio 362a based on initial value (design value) data, and group B showing a wall thickness remaining ratio 362b as a predicted value calculated based on newly input or acquired information. The screen display information 302 shown in FIG. 9 also makes it possible to display the wall thickness remaining ratio for each tube group of tubes 16P of the condenser 16. The screen display information 302 shown in FIG. 9 also includes, as display content, a status prediction result summary 340 that shows the data on which the predicted value is calculated and the calculation results. Furthermore, a condenser tube group layout diagram 350 is included.

The remaining wall thickness ratios 362a and 362b shown in Figure 9 are remaining wall thickness information displayed on a bar graph as a percentage of the average remaining wall thickness ratio for each tube group based on the calculated wall thickness reduction rate relative to the wall thickness of tube 16P in the initial state (design value). Plots showing the maximum and minimum remaining wall thickness ratios within the tube group are displayed above and below the apex of the bar graph. In the example shown in Figure 9, a circle plot indicates the maximum remaining wall thickness ratio, and a diamond plot indicates the minimum remaining wall thickness ratio. Also, in the example shown in Figure 9, a threshold line C indicating a predetermined value is displayed as the remaining wall thickness threshold at which replacing a tube or shutting off a tube is recommended.

In Figure 9, the tube group arrangement diagram 350 shows a schematic representation of the arrangement of the tube groups. The tube group arrangement diagram 350 shows the arrangement of the tube groups of the condenser. The tube group arrangement diagram 350 is configured to be able to selectively display either group 16PA or group 16PB, which are divided within the casing 16cav.

Here, Figure 10 shows another example of screen display information generated by the display information generation unit 430 of the condenser state prediction device 18 of this embodiment. In the example of the tube bank layout diagram 352 of the screen display information 303 shown in Figure 10, tube banks whose remaining wall thickness ratio 362b based on the calculated wall thickness reduction rate exceeds the threshold line C are colored (shaded areas in the diagram). In this case, for example, tube banks whose remaining wall thickness ratio exceeds the threshold line C based on the second calculation data are colored (shaded areas in the diagram). In this case, tube banks whose remaining wall thickness ratio is below the threshold line C may be colored, or different colors may be used for cases where the remaining wall thickness ratio exceeds the threshold line C. In this way, the tube bank layout diagram 352 may be displayed in different colors depending on whether the remaining wall thickness ratio is below the standard or above it.

As shown in Figures 7-10, the screen display information 300, 301, 302, and 303 further includes a heat transmission coefficient display button 310, a wall thickness remaining display button 312, a calculation start button 314, and an inspection history button 316. The heat transmission coefficient display button 310 is a button that displays the screen display information 300 showing the calculation results of the heat transmission coefficient contribution rate, and the wall thickness remaining display button 312 is a button that displays the screen display information 302 showing the calculation results of the wall thickness remaining rate.

The heat transmission coefficient display button 310 in the screen display information 300 is highlighted. When the wall thickness remaining display button 312 is selected with a mouse or the like, the display information generation unit 430 switches the screen display information to be displayed from the screen display information 300 to the screen display information 302. Similarly, the wall thickness remaining display button 312 in the screen display information 302 is highlighted. When the heat transmission coefficient display button 310 is selected with a mouse or the like, the display information generation unit 430 switches the screen display information to be displayed from the screen display information 302 to the screen display information 300.

The calculation start button 314 is a button that instructs the start of calculation. The inspection history button 316 is a button that reflects past inspection history data. The calculation start button 314 and the inspection history button 316 can also be selected using a mouse as the user interface 43, which will be described later.

The user interface 43 includes a display unit that displays various information to the user (administrator) and an input device through which the user inputs various information. The display unit is, for example, a display device. The display unit may also be configured as a touch panel that functions as both a display screen and an input device that allows direct input to the screen. Examples of input devices include a keyboard and a mouse.

The memory unit 44 is a storage medium that stores temperature and pressure information acquired by the measurement data acquisition unit 41, data and calculation results used in the calculations of the calculation unit 42, display data provided to the user via the user interface 43, display data templates, and the like. The memory unit 44 can be realized, for example, by a hard disk drive or non-volatile memory. The memory unit 44 may be physically separated from the condenser state prediction device 18, for example, via a network (not shown). The memory unit 44 has an input information memory unit 440, a measurement information memory unit 450, a program memory unit 460, a calculation result memory unit 470, a template memory unit 480, and a display information memory unit 490.

The input information storage unit 440 is a storage area that stores various information input through the user interface 43. Examples of information input through the input information storage unit 440 include various operating conditions, various setting conditions, and periodic inspection records.

The measurement information storage unit 450 is a storage area that stores various information acquired by the measurement data acquisition unit 41. The program storage unit 460 is a storage area that stores programs that execute the functions of various calculation units, mathematical formula information, etc.

The calculation result storage unit 470 is a storage area that stores the calculation results calculated by the various calculation units. The template storage unit 480 is a storage area that stores display templates used by the display information generation unit 430 when generating display information. A display template is information that indicates the configuration of screen display information to be displayed on the display device (display unit) serving as the user interface 43, and for example, the positions of graph displays and numerical display displays are set in advance. The display template may also include information that indicates the configuration of screen display information that prompts the user to input data and parameters. The display information storage unit 490 is a storage area that stores screen display information generated by the display information generation unit 430. The display unit serving as the user interface 43 reads out the screen display information generated by the display information generation unit 430 from the display information storage unit 490 and displays it.

(Calculation operation of the calculation unit)
Next, the calculation operation of the calculation unit 42 for the predicted values of the cleanliness, the condenser internal pressure, the overall heat transmission coefficient, and the contribution rate of the overall heat transmission coefficient will be described in detail with reference to Fig. 11. Fig. 11 is a flowchart showing the calculation operation of the specification calculation unit 400 and the overall heat transmission coefficient calculation unit 410 of the condenser state prediction device 18 of the embodiment.

The user interface 43 accepts input of parameters required for the calculation. Examples of input parameters include the dimensions and material of the tubes 16P of the condenser 16, a tube correction coefficient CV that corrects for the difference between the heat transfer coefficient of each tube 16P and the average heat transfer coefficient of the analysis results, the number of tubes 16P to which the supply of cooling water has been stopped (number of shut-off valves), and a pipe material correction coefficient FM determined by the Heat Exchange Institute (HEI) for each material of the tubes 16P. The parameters accepted by the user interface 43 may be stored in advance in the input information storage unit 440 of the storage unit 44.

The measurement data acquisition unit 41 acquires the cooling water inlet temperature T1, cooling water outlet temperature T2, condenser pressure P, cooling water volume GW, and other operating data of the condenser 16 and generator 15 as measurement information. When multiple cooling water temperature detectors 30 and multiple cooling water temperature detectors 31 are provided, the average values of the multiple detected data are used as the cooling water inlet temperature T1 and the cooling water outlet temperature T2. In addition, the specification calculation unit 400 calculates the heat exchange duty from the actual output data among the operating data using the following formula.

If the measurement data acquisition unit 41 cannot acquire the cooling water volume GW, the specification calculation unit 400 may calculate the cooling water volume GW using the following formula:

Here, Cp is the specific heat of the cooling water (kJ/kgK), and γ is the density of the cooling water (kg/m ³ ).

If the measurement data acquisition unit 41 is unable to acquire the coolant outlet temperature T2, the specification calculation unit 400 may calculate the coolant outlet temperature T2 using the following formula:

The various parameters acquired by the measurement data acquisition unit 41 may be input from the user interface 43 .

Here, we will explain an example in which the tubes 16P of the condenser 16 are composed of two types of tubes: 16P1 and 16P2. The specification calculation unit 400 calculates the internal flow velocity V1 of tube 16P1 and the internal flow velocity V2 of tube 16P2 using the following formulas based on the numbers N1 and N2 of tubes 16P1 and 16P2, respectively, and the internal diameters di1 and di2 (step S210).

The overall heat transfer coefficient calculation unit 410 calculates the overall heat transfer coefficient. The program storage unit 460 stores in advance a cooling water flow rate correction table, a cooling water inlet temperature correction table, and correction coefficients for the materials of pipes 16P1 and 16P2 for the HEI.

First, the overall heat transmission coefficient calculation unit 410 calculates the overall heat transmission coefficients Up1 and Up2 from a cooling water flow velocity correction table based on the inner diameters di1 and di2 of pipes 16P1 and 16P2 and the internal pipe flow velocities V1 and V2, respectively. The overall heat transmission coefficient calculation unit 410 also calculates the cooling water temperature correction coefficient FW from an inlet temperature correction table based on the HEI. Furthermore, the overall heat transmission coefficient calculation unit 410 calculates the pipe material correction coefficient FM from the correction coefficient for the pipe material based on the HEI.

The overall heat transmission coefficient calculation unit 410 then uses the calculated overall heat transmission coefficients Up1 and Up2, the coolant temperature correction coefficient FW, and the pipe material correction coefficient FM to calculate corrected overall heat transmission coefficients U1 and U2 using the following formula. Overall heat transmission coefficients U1 and U2 are the corrected overall heat transmission coefficients corresponding to pipes 16P1 and 16P2, respectively.

The overall heat transfer coefficient calculation unit 410 calculates the reference overall heat transfer coefficient Um from the overall heat transfer coefficients U1 and U2 using the following formula (step S220). The overall heat transfer coefficient Um is the theoretical reference overall heat transfer coefficient for the condenser 16, which is equipped with the two types of tubes 16P1 and 16P2.

The overall heat transmission coefficient calculation unit 410 calculates the overall heat transmission coefficient _UAi for each tube 16P using the calculated overall heat transmission coefficient Um and the tube correction coefficient CV for each tube 16P using the following equation (9) (step S230). Furthermore, the overall heat transmission coefficient calculation unit 410 adds up the overall heat transmission coefficient _UAi for each tube 16P using equation (10), and divides this total by the number of tubes 16P to calculate the average overall heat transmission coefficient _UAi taking the tube correction coefficient into account (step S240).

The heat transmission coefficient calculation unit 410 uses the average heat transmission coefficient _UAi to calculate the theoretical reference heat transmission coefficient _UA , taking into account the heat transfer coefficient due to the plugging rate, according to the following formula.

Here, f(X) is a correction coefficient for the plugging rate determined from flow analysis. When the number of plugged pipes is N/ _X , the plugging rate X is calculated using the following formula:

Here, for example, the overall heat transmission coefficient of the tube group 16A1 (block A1 in the tube group layout diagram 350) shown in Fig. 5 can be calculated by dividing the sum of the overall heat transmission coefficients _UAi of the tubes 16P included in block A1 by the number of tubes in the block A1 using equation (10). The contribution rate of the overall heat transmission coefficient shown in the screen display information 300 shown in Fig. 7 is the ratio of the overall heat transmission coefficient UA of each tube group (block) to the reference overall heat transmission coefficient _UA of the condenser 16.

For example, the overall heat transmission coefficient contribution rate of the tube group 16A1 (block A1) shown in Figure 7 is calculated by dividing the overall heat transmission coefficient of the tube group 16A1 calculated using equation (10) by the reference overall heat transmission coefficient _UA , expressed as a percentage. The overall heat transmission coefficient contribution rate of each tube group is calculated in a similar manner. As shown in Figures 7 and 8, the overall heat transmission coefficient contribution rate of each tube group is displayed as a bar graph. The overall heat transmission coefficient contribution rate is calculated by the overall heat transmission coefficient calculation unit 410.

Next, the heat transfer coefficient calculation unit 410 calculates the heat transfer coefficient K based on the actual measured values of the actual device using the following formula, based on the heat exchange duty of the condenser 16, the heat transfer area A of the entire tube 16P, and the plugging rate X.

Here, TS is the saturation temperature of the condenser pressure P.

The overall heat transmission coefficient calculation unit 410 calculates the cleanliness factor φ using the following formula based on the overall heat transmission coefficient K, which is based on the actual measurement value of the actual equipment, and the reference overall heat transmission coefficient _UA . The overall heat transmission coefficient calculation unit 410 outputs the calculated cleanliness factor φ to the calculation result storage unit 470. As shown in Figures 7 and 8, the cleanliness factor φ is displayed as a percentage in the condenser performance prediction result 330.

Next, the overall heat transmission coefficient calculation unit 410 calculates a predicted value of the condenser internal pressure. The overall heat transmission coefficient calculation unit 410 calculates a theoretical standard overall heat transmission coefficient U _AX using equations (9)-(12) based on the new parameters (for example, the shut-off plug ratio X') received by the user interface 43. Furthermore, the overall heat transmission coefficient calculation unit 410 multiplies the standard overall heat transmission coefficient U _AX by the cleanliness level φ using the following equation to calculate a predicted overall heat transmission coefficient performance value U _A '.

Next, the overall heat transmission coefficient calculation unit 410 calculates the logarithmic mean temperature difference θm' from the relational expression for the predicted overall heat transmission coefficient performance value U _A ' as shown in the following equations (17) and (18).Then, the overall heat transmission coefficient calculation unit 410 calculates the saturation temperature TS' of the condenser using equation (19) based on the coolant inlet temperature T1, the coolant outlet temperature T2, and the calculated logarithmic mean temperature difference θm' (step S250).

The overall heat transfer coefficient calculation unit 410 then applies the calculated saturation temperature TS' to a steam table previously stored in the program storage unit 460 to calculate the condenser internal pressure P' (step S260). The condenser internal pressure P' becomes the predicted internal pressure. The overall heat transfer coefficient calculation unit 410 outputs the calculated internal pressure to the calculation result storage unit 470.

Next, the metal thinning rate calculation operation by the calculation unit 42 will be described in detail with reference to Figure 12. Figure 12 is a flowchart showing the calculation operation of the metal thinning rate calculation unit 420 of the condenser state prediction device 18 of this embodiment.

The wall-thickness reduction rate calculation unit 420 acquires operating data from the measurement information storage unit 450 (step S270).

The metal reduction rate calculation unit 420 calculates the integrated value of the plant operating time from the acquired operating data (step S280). Note that the metal reduction rate calculation unit 420 may also use a virtual operating time, etc., received via the user interface 43 as the integrated value.

The metal-reduction rate calculation unit 420 calculates the metal-reduction rate using the following formula from the integrated value of the plant operating time (step S290). The metal-reduction rate calculation unit 420 outputs the calculated metal-reduction rate data to the calculation result storage unit 470. The metal-reduction rate is calculated as a statistically approximate value (metal-reduction rate versus time) based on the results of an eddy current testing (ECT).

Here, T is the plant cumulative operating time, y is the predicted wall-thinning rate, and g(T) is a function of the plant cumulative operating time T. The plant cumulative operating time may be stored in advance in the storage unit 44 via the user interface 43, or may be output in advance to the storage unit 44 via the measurement data acquisition unit 41.

The wall-thickness reduction rate calculation unit 420 calculates the remaining wall thickness rate of the tube 16P of the condenser 16 based on the predicted wall-thickness reduction rate y as the remaining wall thickness rate 360 in the screen display information 302 and the screen display information 303. The remaining wall thickness rate indicates the remaining proportion of the wall thickness of the tube 16P as a percentage after the plant's cumulative operating time T has elapsed, based on the initial value (design value) of the tube 16P. The remaining wall thickness rate may also be expressed as an average value for each tube group. The wall-thickness reduction rate calculation unit 420 outputs the calculated remaining wall thickness rate data to the calculation result storage unit 470 of the storage unit 44.

(Overall Operation of Condenser State Prediction Device 18)
Next, the operation of the condenser state prediction device 18 of the embodiment will be described with reference to Fig. 13. Fig. 13 is a flowchart showing the overall operation of the condenser state prediction device 18 of the embodiment.

The user interface 43 receives specification data for the condenser 16 from the user (step S110). Examples of specification data received by the user interface 43 include the dimensions, material, heat transfer coefficient data and number of plugs for the condenser tubes, and the pipe material correction coefficient FM for the HEI. The specification data may be stored in advance in the input information storage unit 440. The user interface 43 outputs the received information to the input information storage unit 440.

Next, the measurement data acquisition unit 41 acquires temperature information related to the cooling water inlet temperature T1 and the cooling water outlet temperature T2 detected by the cooling water temperature detector 30 and the cooling water temperature detector 31, the condenser pressure P detected by the condenser pressure detector 32, the actual output of the generator 15, the amount of cooling water supplied to the condenser 16, etc., and outputs these to the measurement information storage unit 450 (step S120). The measurement data acquisition unit 41 may store this information in the measurement information storage unit 450 on a daily basis, and make it readable by the calculation unit 42.

In the initial state, the display information generation unit 430 generates screen display information 300 or 302 including initial values and previous calculation values, and displays this on a display device or the like serving as a user interface 43. When the user selects, for example, the calculation start button 314 on the screen display information 300 using a mouse or the like serving as a user interface 43, the display information generation unit 430 generates and presents to the user screen display information that prompts the user to input or select calculation conditions for the calculation.

Figure 14 shows screen display information 304a that prompts the user to input calculation conditions based on existing heat balance HB values. In the example shown in Figure 14, the user can input calculation conditions by using a mouse or other device to select from 100% load, 75% load, 50% load, and 25% load, which indicate the load on the steam turbine. Based on the load on the steam turbine, heat balance HB data such as cooling water inlet temperature T1, cooling water outlet temperature T2, heat exchange amount, and cooling water amount are pre-set as input information and stored in the input information storage unit 440.

Figure 15 shows screen display information 304b, which prompts the user to enter calculation conditions based on past actual machine operating data. In the example shown in Figure 15, operating parameters for a specified date and time (Date, Time) can be specified. Examples of operating parameters include the cooling water inlet temperature T1, the cooling water outlet temperature T2, the amount of heat exchanged, and the amount of cooling water.

Figure 16 shows screen display information 305 that prompts the user to enter optional conditions when entering calculation conditions based on the heat balance HB shown in Figure 14 or calculation conditions based on past actual operation data shown in Figure 15. In the example shown in Figure 16, the data entered based on the heat balance HB or past actual operation data can be modified.

Figure 17 shows screen display information 304c that prompts the user to input calculation conditions when arbitrarily setting them. In the example shown in Figure 17, calculation conditions can be input directly using a keyboard or the like as the user interface 43.

Screen display information 304a prompts the user to enter calculation conditions based on the existing heat balance HB value, screen display information 304b prompts the user to enter calculation conditions based on past actual operation data, and screen display information 304c prompts the user to enter calculation conditions as desired. Each screen display information includes a heat balance input button 320, a past data input button 322, and an optional setting button 324. By selecting one of these buttons through the user interface 43, the user can display the selected screen display information and make the corresponding input or selection.

Figure 18 shows screen display information 306a, which prompts the user to input whether or not there are any changes to the specifications of the condenser 16 after the calculation conditions have been entered. If the user selects Yes (specification changes), the user can enter basic specification data for the condenser 16 via a storage medium such as a USB memory as the user interface 43.

Figure 19 is an example of basic specification data for the condenser 16. As shown in Figure 19, the basic specification data 306b includes information identifying the tubes 16P of the condenser 16 (tube group symbol, tube group number, tube group row number, tube group row number), as well as information such as the presence or absence of a stopcock to stop the cooling water from the identified tube 16P, and the type of material used for re-tubing. The basic specification data 306b can be created as text data in CSV format, for example, and can be input via the user interface 43.

When the user selects the inspection history button 316 on the screen display information 302, for example, using a mouse or the like as the user interface 43, the display information generation unit 430 generates screen display information that prompts the user to select an inspection history and presents it to the user. Figure 20 shows an example of screen display information 308a that prompts the user to input an inspection history. In response to the display of the screen display information 308a, the user can input inspection history data, created as text data in CSV format, for example, through the user interface 43.

Figure 21 shows an example of inspection history data. As shown in Figure 21, the inspection history data 308b includes a tube group symbol, tube group number, tube group row number, and tube group row number that identify the tubes 16P of the condenser 16, as well as the remaining wall rate determined by ECT, the status of the shutoff valves, the status of recubing, etc.

After inputting the inspection history data, when the user selects the calculation start button 314 on the screen display information 302 using a mouse or other user interface 43, the display information generation unit 430 generates and presents screen display information to the user that prompts the user to input or select calculation conditions for the calculation.

Figure 22 shows an example of screen display information 309 that prompts the user to enter calculation conditions such as the time to predict wall thinning, the plant availability rate up to the prediction time, and inspection records that serve as initial values for the calculation. The user can enter these calculation conditions using a keyboard as the user interface 43 in accordance with the screen display information 309.

When the user enters calculation conditions in accordance with the screen display information exemplified in Figures 14 to 22, the specification calculation unit 400, overall heat transmission coefficient calculation unit 410, and wall thinning rate calculation unit 420 of the calculation unit 42 acquire various information from the input information storage unit 440 and measurement information storage unit 450, and calculate the cleanliness, condenser internal pressure, overall heat transmission coefficient, contribution rate of overall heat transmission coefficient, predicted wall thinning rate, remaining wall rate, etc. through the calculation operations described above (step S130). The calculation unit 42 outputs the calculation results to the calculation result storage unit 470 of the storage unit 44.

Figure 23 is an example of a calculation result including a predicted wall-thickness reduction rate calculated by the wall-thickness reduction rate calculation unit 420. As shown in Figure 23, the calculation result 370, such as a predicted wall-thickness reduction rate, may include a tube bank symbol, tube bank number, tube bank row number, and tube bank row number that identify the tubes of the condenser 16, as well as the status of the shutoff valve, a predicted wall-thickness reduction rate, and a wall-thickness reduction ratio. The calculation result 370 may also include the remaining wall-thickness ratio stored in the calculation result storage unit 470. Such calculation result 370 may be generated as text data in CSV format, for example. In this case, the user can output it through the user interface 43.

The display information generation unit 430 then reads the calculation results, such as cleanliness, condenser internal pressure, overall heat transmission contribution rate, and wall remaining rate, from the calculation result storage unit 470, and reads a template for screen display information to be displayed on the display device serving as the user interface 43 from the template storage unit 480 (step S140). The display information generation unit 430 applies the calculation results to the template for screen display information to generate, for example, screen display information 300 or screen display information 302 (step S150).

The display information generation unit 430 sends either the generated screen display information 300 or 303 to the display device serving as the user interface 43, outputting it to the user (step S160). The display information generation unit 430 also outputs either the generated screen display information 300 or 303 to the display information storage unit 490. The display unit serving as the user interface 43 reads the generated screen display information from the display information storage unit 490 and displays it.

The user can obtain more detailed calculation results through a display device serving as a user interface 43 on which screen display information 300 or screen display information 302 is displayed. Figure 24 shows an example of screen display information 372 generated by the display information generation unit 430 when, for example, the user selects the bar graph for tube group A2 with remaining wall thickness 362b in screen display information 302 using a mouse or the like. In this embodiment, when the display information generation unit 430 selects, for example, a bar graph showing a remaining wall thickness based on a wall thickness reduction rate in screen display information 302, it can generate screen display information 372 showing a distribution chart of the remaining wall thickness of the corresponding tube group. As shown in Figure 24, screen display information 372 includes a distribution chart of the remaining wall thickness of each tube in tube group A2, with a reference value of 50%.

After outputting either screen display information 300 or screen display information 303, the user interface 43 waits to receive input from the user (step S170). When the user selects the calculation start button 314 with a mouse or the like, and input of information or parameters as new calculation conditions is detected (Yes in step S170), the user interface 43 outputs the input information to the input information storage unit 440. Furthermore, when input information is output from the user interface 43, the calculation unit 42 executes calculation processing based on the new calculation conditions, and the display information generation unit 430 updates the screen display information (steps S130 to S160). The display information generation unit 430 outputs the updated screen display information to the display information storage unit 490. The display unit serving as the user interface 43 reads the updated screen display information from the display information storage unit 490 and displays it.

The updated screen display information updates the cleanliness 332b, condenser pressure 334b, and overall heat transfer coefficient contribution rate 336b, or remaining wall rate 362b, previously displayed as Group B, to Group A's cleanliness 332a, condenser pressure 334a, and overall heat transfer coefficient contribution rate 336a, or remaining wall rate 362a. The calculation results calculated using the new calculation conditions are updated to Group B's cleanliness 332b, condenser pressure 334b, and overall heat transfer coefficient contribution rate 336b, or remaining wall rate 362b. In other words, the display for Group A includes the calculation results based on the calculation conditions (first calculation conditions) set before the calculation results updated with the new calculation conditions, while the display for Group B includes the calculation results updated with the latest calculation conditions (second calculation conditions). This screen display information makes it easy to visually compare the initial values or previous calculation results with the latest calculation results.

In this way, the condenser state prediction device 18 of this embodiment can calculate predicted values for the condenser 16 cleanliness, internal condenser pressure, overall heat transfer coefficient, contribution rate of the overall heat transfer coefficient, predicted wall thinning rate, and remaining wall rate of the tubes, and output the calculation results as screen display information. This allows the user to visually grasp the current or future remaining wall condition, taking into account the latest records, without having to undergo periodic inspections.

In addition, the condenser state prediction device 18 of this embodiment visually displays whether the contribution rate of the overall heat transfer coefficient and the remaining wall rate exceed the reference point, allowing the user to easily visually grasp the number of tubes (tube groups) that exceed the threshold at any given time. This allows for smooth preparation of replacement parts for repairs to the condenser 16.

Furthermore, the condenser state prediction device 18 of the embodiment can display and compare the contribution rate of heat transfer coefficient and the remaining wall rate using any information or parameters. Therefore, by changing the information or parameters and repeating calculations in the condenser state prediction device 18, the user can also understand the operational parameters for extending the life of the condenser 16 tubes.

Here, an example of the overall operation of the condenser state prediction device 18 of this embodiment will be described with reference to Figure 25 and Figures 26A to 26D. Figure 25 is a flowchart showing an example of a user's operation for performance prediction using the condenser state prediction device 18 of this embodiment.

Here, we will explain the example of how to predict the remaining material rate at a specific point in the future by referencing the remaining material rate results based on past inspection data.

When the user specifies the actual machine to be predicted through the input device serving as the user interface 43 and selects the remaining wall rate display button 312 in the screen display information, the display information generation unit 430 generates screen display information including the remaining wall rate based on the display template stored in the template storage unit 480 (step S400). Figure 26A shows example screen display information 302a showing the remaining wall rate 360 of a pipe.

When the user further inputs the inspection history data 308b shown in FIG. 21 in response to the screen display information 308a shown in FIG. 20, the condenser state prediction device 18 imports the wall thickness remaining ratio included in the inspection history data 308b into the input information storage unit 440 of the storage unit 44. The display information generation unit 430 generates screen display information 302a that includes the wall thickness remaining ratio included in the inspection history data 308b as wall thickness remaining ratios 362a and 362b. As shown in FIG. 26A, at this stage, groups A and B of the screen display information 302a both display the same graph showing wall thickness remaining information including the wall thickness remaining ratio of the inspection history data 308b.

Next, the user sets the period for predicting the remaining wall thickness rate (step S410). When the user inputs the estimated value for the cumulative plant operation time (period) via the input screen shown in screen display information 309 in FIG. 22 and selects the calculation start button 314, the wall thickness reduction rate calculation unit 420 calculates the wall thickness reduction rate (step S420). The display information generation unit 430 generates screen display information that includes the remaining wall thickness rate based on the wall thickness reduction rate calculated by the wall thickness reduction rate calculation unit 420 as remaining wall thickness rate 362b.

Figure 26B shows screen display information 302b including a wall thickness remaining rate 362b calculated based on the accumulated plant operation time provided by the user. Screen display information 302b includes wall thickness remaining rate 362a, which is wall thickness remaining information including a wall thickness remaining rate based on inspection history data 308b, and wall thickness remaining rate 362b, which is wall thickness remaining information including a wall thickness remaining rate based on a predicted wall thickness reduction rate based on the accumulated time provided by the user. The user can learn the wall thickness reduction trend of the pipe by referring to screen display information 302b, which compares the wall thickness remaining rate at the time of inspection with the wall thickness remaining rate based on the predicted wall thickness reduction rate.

The user can refer to the screen display information 302b to change the prediction period and recalculate the metal reduction rate under various conditions (Yes in step S430). When the user inputs new estimated values through the input screen shown in the screen display information 309 in FIG. 22 and selects the calculation start button 314, the metal reduction rate calculation unit 420 calculates the metal reduction rate under the new conditions (steps S410 to S420).

When the user inputs a new estimated value for the cumulative time through the input screen shown in screen display information 309 in FIG. 22 and the wall thickness reduction rate calculation unit 420 calculates the remaining wall thickness rate based on the wall thickness reduction rate under the conditions of the new estimated value, the display information generation unit 430 generates screen display information that includes the remaining wall thickness rate based on the wall thickness reduction rate based on the cumulative time provided by the user in the previous prediction as remaining wall thickness rate 362a, and the remaining wall thickness rate based on the wall thickness reduction rate based on the cumulative time provided by the user in the current prediction as remaining wall thickness rate 362b. This allows the user to compare and refer to the calculation results of the remaining wall thickness rate according to the provided cumulative time.

The user can create a repair plan, including a pipe closure plan, based on the calculation results of the remaining wall thickness rate based on the pipe wall thickness thinning rate (No in step S430, step S440). For example, a plan can be created that considers whether or not to close a pipe depending on the progress of pipe wall thinning, or whether or not to re-tube a pipe with advanced wall thinning, and includes the timing of when to apply these measures.

Next, we will explain an example of how to predict the contribution rates of cleanliness, condenser pressure, and heat transfer coefficient when a proposed repair plan is reflected, by referring to the calculation results of the contribution rates of cleanliness, condenser pressure, and heat transfer coefficient based on the design values of the condenser 16 as the initial state.

The user can calculate a performance prediction for the condenser 16 based on the repair plan drawn up in step S440. When the user selects the overall heat transmission coefficient display button 310 via the input device serving as the user interface 43, the display information generation unit 430 generates screen display information showing performance information including the overall heat transmission coefficient contribution rate, etc., based on the display template stored in the template storage unit 480 (step S450). Figure 26C shows screen display information 302c representing the condenser state prediction result 330 based on the conditions at the time of design.

At this stage, the screen display information 302c initially includes cleanliness, condenser internal pressure, and overall heat transfer coefficient contribution rates based on the design values of the condenser 16 as cleanliness 332a, 332b, condenser internal pressure 334a, 334b, and overall heat transfer coefficient contribution rates 336a, 336b. In other words, the same graph is displayed for groups A and B.

Next, the user inputs parameters required for calculating the performance of the condenser 16, including the number of shut-off valves based on the proposed shut-off plan and whether or not re-tubing is required (step S460). The number of shut-off valves can be input into the input device serving as the user interface 43, for example, by checking the "Shut-off valve installation" item in the basic specification data for the condenser 16 shown in FIG. 19. The presence or absence of re-tubing can be input into the input device serving as the user interface 43, for example, by checking the "Re-tubing" item in the basic specification data for the condenser 16 shown in FIG. 19. Other parameters required for performance calculation include, for example, heat balance HB and simulation data.

When the user selects the calculation start button 314 via the input device serving as the user interface 43, the overall heat transmission coefficient calculation unit 410 calculates the cleanliness, condenser pressure, overall heat transmission coefficient, and overall heat transmission coefficient contribution rate (step S470). The display information generation unit 430 generates screen display information showing performance information including the cleanliness, condenser pressure, and overall heat transmission coefficient contribution rate calculated by the overall heat transmission coefficient calculation unit 410.

Figure 26D shows screen display information 302d including cleanliness 332b, condenser pressure 334b, and overall heat transfer coefficient contribution rate 336b calculated based on parameters including the number of shutoff valves and whether or not retubing is performed based on the planned shutoff plan. Screen display information 302d includes cleanliness 332a, condenser pressure 334a, and overall heat transfer coefficient contribution rate 336a based on the initial design values for cleanliness, condenser pressure, and overall heat transfer coefficient, and also includes cleanliness 332b, condenser pressure 334b, and overall heat transfer coefficient contribution rate 336b calculated based on parameters including the number of shutoff valves and whether or not retubing is performed based on the planned shutoff plan. By referring to the screen display information 302d, the user can compare the performance information of the condenser 16 at the time of design with the performance information of the condenser 16 based on the set parameters and see any changes.

The user can refer to the screen display information 302d and change parameters to recalculate the cleanliness, condenser pressure, overall heat transfer coefficient, and overall heat transfer coefficient contribution rate under various conditions (Yes in step S480). When the user inputs new parameters through the input device serving as the user interface 43 and selects the start calculation button 314, the overall heat transfer coefficient calculation unit 410 calculates the cleanliness, condenser pressure, overall heat transfer coefficient, and overall heat transfer coefficient contribution rate under the new conditions (steps S460 to S470).

In this way, users can visually grasp changes in cleanliness, condenser internal pressure, and heat transfer coefficient contribution rates that accompany future tube repair plans, etc., and understand the impact that repair plans, etc. will have on condenser performance.

The above-described embodiment makes it possible to provide a condenser state prediction device that can recognize state prediction information related to condenser performance and tube thinning based on operating conditions.

Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in a variety of other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their variations are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as set forth in the claims.

1...Steam turbine equipment, 10...Boiler, 11...High-pressure turbine, 12...Reheater, 13...Intermediate-pressure turbine, 14...Low-pressure turbine, 15...Generator, 16...Condenser, 16A1 to 16A10...Tube group, 16BinA, 16BinB...Inlet box, 16BoutA, 16BoutB...Outlet box, 16WinA, 16WinB...Inlet, 16WoutA, 16WoutB...Outlet, 16Wout...Outlet pipe, 16cav...Housing, 16Cout...Drain outlet, 16 PA, 16PB... group, 16S... steam, 16Sin... steam inlet, 17... feedwater pump, 18... condenser state prediction device, 20... main steam pipe, 21... low-temperature reheat pipe, 22... high-temperature reheat pipe, 23... crossover pipe, 24... exhaust pipe, 25... feedwater pipe, 30, 31... cooling water temperature detector, 32... condenser pressure detector, 41... measurement data acquisition unit, 42... calculation unit, 43... user interface, 44... storage unit, 300 to 303, 304a to 304c, 305, 306 a, 308a, 309...screen display information, 306b...basic specification data, 308b...inspection history data, 310...heat transmission coefficient display button, 312...remaining wall ratio display button, 314...calculation start button, 316...inspection history button, 320...heat balance input button, 322...past data input button, 324...arbitrary setting button, 330...condenser state prediction result, 332a, 332b...cleanliness, 334a, 334b...condenser internal pressure, 336a, 336b...heat transmission coefficient Contribution rate, 340...state prediction result summary, 350-352...pipe bank layout diagram, 360, 362a-362b...wall remaining ratio, 370...calculation result, 372...screen display information, 400...specification calculation unit, 410...heat transmittance calculation unit, 420...wall thinning rate calculation unit, 430...display information generation unit, 440...input information storage unit, 450...measurement information storage unit, 460...program storage unit, 470...calculation result storage unit, 480...template storage unit, 490...display information storage unit, A, B...group.

Claims (6)

A condenser state prediction device comprising: a display information generation unit that generates at least one of: first screen display information that causes a display unit to display performance information including the heat transfer coefficient of a condenser predicted based on measured measurement information or input input information, for each tube group of tubes into which cooling water is introduced in the condenser; and second screen display information that causes the display unit to display remaining wall thickness information indicating the remaining percentage of the wall thickness of the tubes predicted based on the input information, for each tube group . 2. The condenser state prediction device according to claim 1, wherein the performance information further includes at least one of the cleanliness of the condenser and the internal pressure of the condenser. The condenser state prediction device described in claim 1, characterized in that the first screen display information includes first calculation data indicating the performance information calculated based on first calculation conditions, and second calculation data indicating the performance information calculated based on second calculation conditions different from the first calculation conditions. The condenser state prediction device described in claim 1, characterized in that the second screen display information includes first calculated data indicating the remaining wall information predicted based on the input information, and second calculated data indicating the remaining wall information predicted based on input information different from the input information. A condenser state prediction device as described in claim 3, characterized in that the second calculation conditions are the most recent calculation conditions, and the first calculation conditions are calculation conditions that were set before the calculation results based on the second calculation conditions. a measurement data acquisition unit that acquires at least one of a cooling water inlet temperature of the cooling water entering the tubes , a cooling water outlet temperature of the cooling water discharged from the tubes , and an integrated operating time of the condenser;
2. The condenser state prediction device according to claim 1, further comprising: a calculation unit that executes at least one of calculation of the performance information based on the cooling water inlet temperature and the cooling water outlet temperature, and calculation of the remaining wall information based on an accumulated operating time of the condenser.