Condenser condition prediction device

Abstract

To provide a condenser state prediction device that enables recognition of state prediction information on performance of a condenser and reduction of pipe thickness based on an operating condition.SOLUTION: A condenser state prediction device includes a display information generation section that generates at least one of screen display information 300 displayed by a display section and comprising performance information indicating condenser performance predicted on the basis of measured measurement information or input input information and screen display information displayed by the display section and comprising remaining thickness information indicating a remaining rate of thickness of a pipe of the condenser predicted on the basis of the input information.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a condenser state prediction device. [Background technology]

[0002] A surface condenser is a type of condenser used in steam turbine equipment. 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. Hereinafter, the surface condenser will be simply referred to as the condenser.

[0003] 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. Among these, seawater is used in many facilities.

[0004] The inner surfaces of condenser tubes corrode and become dirty due to substances contained in the cooling water. Corrosion of the inner surface of the tubes causes the tube wall thickness to decrease (thinning). Furthermore, dirt on the inner surface of the tubes reduces the heat transfer coefficient, causing a decrease in the performance of the condenser. The decrease in tube wall thickness and the decrease in condenser performance progress over time.

[0005] Conventionally, the progression of condenser tube thinning can be detected during periodic inspections, which are conducted by shutting down steam turbine equipment. However, even if a periodic inspection reveals that condenser tube thinning exceeds a critical value, the steam turbine equipment must be shut down for an extended period of time, since it generally takes time to repair the condenser and procure parts. Furthermore, performance changes resulting from condenser tube replacement can only be identified by operating the condenser. Therefore, conventionally, it has been difficult to predict the impact of repairs on condenser performance and condition. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 135759 / 1983 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-145496 [Patent Document 3] Japanese Patent Application Publication No. 2019-79275 Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, conventionally, the progression of condenser wall thinning can only be detected by inspections that require shutdown of the plant. Even if the condenser is repaired as a result of the inspection, it is difficult to predict changes in its performance or condition.

[0008] The problem to be solved by the present invention is to provide a condenser state prediction device that can recognize state prediction information related to condenser performance based on operating conditions, tube thinning, etc. [Means for solving the problem]

[0009] The condenser state prediction device of the embodiment is a condenser state prediction device that predicts the state of a condenser based on measured measurement information or input information. Includes thermal conductivity Performance information In a condenser, cooling water is introduced into each tube bank. First screen display information to be displayed on the display unit and remaining wall information indicating the remaining ratio of the wall thickness of the pipe predicted based on the input information. By tube bank The display information generating unit generates at least one of the second screen display information to be displayed on the display unit. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a system diagram showing a configuration of a steam turbine facility equipped with a condenser state prediction device according to an embodiment; [Figure 2] 1 is a front view showing the configuration of a condenser targeted by a condenser state prediction device according to an embodiment. [Figure 3] 1 is a side view showing the configuration of a condenser targeted by a condenser state prediction device according to an embodiment; [Figure 4]1 is a side view showing the configuration of a condenser targeted by a condenser state prediction device according to an embodiment; [Figure 5] 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; [Figure 6] 1 is a block diagram showing a functional configuration of a condenser state prediction device according to an embodiment; [Figure 7] 3 is a diagram illustrating an example of screen display information generated by the condenser state prediction device according to the embodiment. FIG. [Figure 8] 3 is a diagram illustrating an example of screen display information generated by the condenser state prediction device according to the embodiment. FIG. [Figure 9] FIG. 10 is a diagram illustrating another example of screen display information generated by the condenser state prediction device according to the embodiment. [Figure 10] FIG. 10 is a diagram illustrating another example of screen display information generated by the condenser state prediction device according to the embodiment. [Figure 11] 4 is a flowchart showing the operation of a calculation unit of the condenser state prediction device according to the embodiment. [Figure 12] 4 is a flowchart showing the operation of a calculation unit of the condenser state prediction device according to the embodiment. [Figure 13] 3 is a flowchart showing the overall operation of the condenser state prediction device according to the embodiment. [Figure 14] 1 is a diagram illustrating an example of screen display information for receiving input to a condenser state prediction device according to an embodiment. FIG. [Figure 15] 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. [Figure 16] 1 is a diagram illustrating an example of screen display information for receiving input to a condenser state prediction device according to an embodiment. FIG. [Figure 17] 1 is a diagram illustrating an example of screen display information for receiving input to a condenser state prediction device according to an embodiment. FIG. [Figure 18] 1 is a diagram illustrating an example of screen display information for receiving input to a condenser state prediction device according to an embodiment. FIG. [Figure 19] FIG. 2 is a diagram illustrating an example of basic specification data of the condenser state prediction device according to the embodiment. [Figure 20] 1 is a diagram illustrating an example of screen display information for receiving input to a condenser state prediction device according to an embodiment. FIG. [Figure 21] FIG. 2 is a diagram illustrating an example of an inspection history of the condenser state prediction device according to the embodiment. [Figure 22] 1 is a diagram illustrating an example of screen display information for receiving input to a condenser state prediction device according to an embodiment. FIG. [Figure 23] 5A and 5B are diagrams illustrating an example of a calculation result of the condenser state prediction device according to the embodiment. [Figure 24] 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. [Figure 25] 4 is a flowchart illustrating an example of a user's operation of the condenser state prediction device according to the embodiment. [Figure 26A] 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. [Figure 26B] 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. [Figure 26C] 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. [Figure 26D] 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. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] Fig. 1 is a system diagram that schematically shows the configuration of a steam turbine facility 1 that includes a condenser state prediction device 18 according to an embodiment. As shown in Fig. 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 a facility that is the target of state prediction in the condenser state prediction device 18, such as performance and thinning of cooling water pipes.

[0013] The boiler 10 heats feedwater to generate steam and delivers the steam to a main steam pipe 20. The high-pressure turbine 11 is rotated by steam introduced from the main steam pipe 20 and discharges the steam to a low-temperature reheat pipe 21. The reheater 12 reheats the steam introduced from the low-temperature reheat pipe 21 and delivers the steam to a high-temperature reheat pipe 22.

[0014] The intermediate-pressure turbine 13 is rotated by steam introduced from the high-temperature reheat pipe 22 and discharges the steam into a crossover pipe 23. The low-pressure turbine 14 is rotated by steam introduced from the crossover pipe 23 and discharges the steam into an exhaust pipe 24. The generator 15 is driven by the high-pressure turbine 11, the intermediate-pressure turbine 13, and the low-pressure turbine 14 to generate electricity.

[0015] The condenser 16 condenses the steam introduced from 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. The configuration of the condenser 16 will be described in detail later.

[0016] 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, etc. The condenser state prediction device 18 can be realized by, for example, a computer device.

[0017] 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 (cooling water inlet temperature) T1 of the cooling water introduced into the tubes of the condenser 16. 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 an introduction box 16BinA and an introduction box 16BinB, as described below. Furthermore, the cooling water temperature detector 30 may be provided in each of multiple tubes through which cooling water flows, which are provided in the condenser 16, as described below.

[0018] 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 at a location that can detect the temperature of the cooling water discharged from a pipe provided in the condenser 16. A plurality of 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 port 16WoutA of the discharge box 16BoutA and the discharge port 16WoutB of the discharge box 16BoutB. Furthermore, the cooling water temperature detector 31 may be provided at each pipe provided in the condenser 16, for example.

[0019] 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 configured with, 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.

[0020] 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 perform a predictive calculation to evaluate the state 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.

[0021] Here, Fig. 2 is a front view showing the configuration of a condenser 16 whose performance and wall thinning are predicted by the condenser state prediction device 18 of the embodiment. Figs. 3 and 4 are side views showing the configuration of a condenser 16 whose performance and wall thinning are predicted by the condenser state prediction device 18 of the embodiment. As shown in Figs. 2 to 4, the condenser 16 has a housing 16cav having a substantially rectangular parallelepiped shape.

[0022] As shown in FIGS. 2 to 4, the housing 16cav has, on one side thereof, inlet boxes 16BinA and 16BinB into which cooling water is introduced. The inlet boxes 16BinA and 16BinB have inlet ports 16WinA and 16WinB, respectively, through which cooling water is introduced. The inlet ports 16WinA and 16WinB receive cooling water from the lower side of the housing 16cav. The housing 16cav also has, on its other side thereof, outlet boxes 16BoutA and 16BoutB into which cooling water discharged from each pipe 16P flows. The outlet boxes 16BoutA and 16BoutB have outlet ports 16WoutA and 16WoutB, respectively, through which cooling water is discharged. The outlet ports 16WoutA and 16WoutB discharge the cooling water via the outlet pipe 16Wout, for example, toward the front or rear of the housing 16cav. The housing 16cav has a plurality of pipes 16P disposed substantially horizontally therein between the inlet box 16BinA and the inlet box 16BinB and the outlet box 16BoutA and the outlet box 16BoutB.

[0023] 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) into a front-side group 16PA and a rear-side group 16PB in each divided area. Inlet box 16BinA and inlet box 16BinB correspond to group 16PA and group 16PB, respectively. That is, the cooling water introduced into inlet box 16BinA is sent to pipes 16P of group 16PA. Similarly, the cooling water introduced into inlet box 16BinB is sent to pipes 16P of group 16PB.

[0024] Discharge boxes 16BoutA and 16BoutB correspond to groups 16PA and 16PB, respectively. That is, the cooling water that has passed through pipes 16P of group 16PA is discharged from outlet 16WoutA via discharge box 16BoutA. Similarly, the cooling water that has passed through pipes 16P of group 16PB is discharged from outlet 16WoutB via discharge box 16BoutB.

[0025] Inlet box 16BinA and inlet box 16BinB are provided with cooling water temperature detectors 30, which detect cooling water inlet temperatures T1 of inlet box 16BinA and inlet box 16BinB. At least one cooling water temperature detector 30 is provided in each of inlet box 16BinA and inlet box 16BinB. Alternatively, multiple cooling water temperature detectors 30 may be provided in inlet box 16BinA and inlet box 16BinB. Instead of inlet box 16BinA and inlet box 16BinB, cooling water temperature detectors 30 may be provided in the piping that supplies cooling water to inlet box 16BinA and inlet box 16BinB.

[0026] Discharge box 16BoutA and discharge box 16BoutB are provided with cooling water temperature detectors 31, which detect 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. Alternatively, cooling water temperature detectors 31 may be provided for discharge pipes 16Wout that discharge cooling water from discharge outlets 16WoutA and 16WoutB instead of discharge outlets 16WoutA and 16WoutB.

[0027] FIG. 5 is a schematic diagram showing a cross section perpendicular to the longitudinal direction of a tube 16P of the condenser 16 shown in FIGS. 2 to 4, whose performance and wall thinning are predicted by the condenser state prediction device 18 according to an embodiment. FIG. 5 shows one of groups 16PA and 16PB divided within a 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 FIG. 5, the multiple tubes 16P of the condenser 16 are divided into multiple blocks (tube groups) and managed. In the example shown in FIG. 5, the upper tube groups 16A1 and 16A2, the lower tube groups 16A6 and 16A7, the tube groups 16A3, 16A4, and 16A5 arranged between the tube groups 16A1 and 16A2, and the tube groups 16A8, 16A9, and 16A10 arranged between the tube groups 16A6 and 16A7 are shown.

[0028] The cooling water introduced from inlet box 16BinA passes through pipes 16P of group 16PA, cools steam 16S, and is discharged to discharge box 16BoutA. The cooling water introduced from inlet box 16BinB passes through pipes 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.

[0029] Here, when one cooling water temperature detector 30 is provided in each of introduction boxes 16BinA and 16BinB, the cooling water inlet temperature T1 is the arithmetic mean value of the temperatures detected by each cooling water temperature detector 30. When 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 the multiple cooling water temperature detectors 30 is the cooling water inlet temperature T1.

[0030] Cooling water temperature detector 31 detects the temperature of the cooling water discharged from pipe 16P as cooling water outlet temperature T2. Here, if one cooling water temperature detector 31 is provided in each of discharge boxes 16BoutA and 16BoutB, the arithmetic mean value of the temperatures detected by each cooling water temperature detector 31 is taken as cooling water outlet temperature T2. Furthermore, if multiple cooling water temperature detectors 31 are provided in each of discharge boxes 16BoutA and 16BoutB, the arithmetic mean value of the temperatures detected by the multiple cooling water temperature detectors 31 is taken as cooling water outlet temperature T2.

[0031] The same applies when a coolant temperature detector 31 is provided at each of outlets 16WoutA and 16WoutB. The arithmetic mean value of the coolant temperatures at outlets 16WoutA and 16WoutB detected by coolant temperature detector 31 is defined as coolant outlet temperature T2. The same applies when multiple coolant temperature detectors 31 are provided at each of outlets 16Wout and 16WoutB, and the arithmetic mean value of the temperatures detected by each of the multiple coolant temperature detectors 31 is defined as coolant outlet temperature T2.

[0032] The casing 16cav has a steam inlet 16Sin on its top surface that is connected 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 accumulated at the bottom of the casing 16cav is discharged from the drain outlet 16Cout.

[0033] Next, the condenser state prediction device 18 will be described.

[0034] Fig. 6 is a block diagram showing the functional configuration of the condenser state prediction device 18 according to the embodiment. As shown in Fig. 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 realized by, for example, a computer device.

[0035] 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 (for example, one hour intervals). The measurement data acquisition unit 41 converts the acquired detection signal indicating the cooling water inlet temperature T1 and the acquired detection signal indicating the cooling water outlet temperature T2 into temperature information, and outputs the information to the storage unit 44. The measurement data acquisition unit 41 also acquires the accumulated operating time of the steam turbine equipment 1 and outputs the information to the storage unit 44.

[0036] The calculation unit 42 is a calculation block that evaluates the performance of the condenser and predicts tube thinning. The calculation unit 42 loads a predetermined program from the storage unit 44 into an internal storage area (not shown) and executes it to achieve a predetermined function. The 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.

[0037] The specification calculation unit 400 is a calculation block that calculates basic data of the condenser 16, such as the inner diameter, heat transfer area, and flow rate of the tubes. 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 ratio of the tubes 16P of the condenser 16. The specification calculation unit 400, the overall heat transfer coefficient calculation unit 410, and the wall-thinning rate calculation unit 420 output their calculation results to a calculation result storage unit 470 in 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 through 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 later). The display information generation unit 430 also outputs the screen display information to the user interface 43 and the display information storage unit 490.

[0038] 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 the screen display information is an HTML format, which allows easy preparation of a template in advance.

[0039] 7 shows an example of screen display information generated by the display information generator 430 of the condenser state prediction device 18 according to the embodiment. In the example shown in Fig. 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, as performance information indicating the performance of the condenser 16, two groups: Group A (first calculated data) including a cleanliness 332a, a condenser internal pressure 334a, and a contribution rate of overall heat transfer 336a; and Group B (second calculated data) including a cleanliness 332b, a condenser internal pressure 334b, and a contribution rate of overall heat transfer 336b. In group A, the cleanliness 332a, the condenser internal pressure 334a, and the overall heat transfer coefficient contribution rate 336a indicate predicted values based on data of initial values (design values), while in group B, the cleanliness 332b, the condenser internal pressure 334, and the 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 include the overall heat transfer coefficient.

[0040] The cleanliness levels 332a and 332b and the condenser internal pressures 334a and 334b are each displayed, for example, as a semicircular graph, with predicted values also displayed. In the example shown in Fig. 7, the values representing the cleanliness levels 332a and 332b are displayed as percentages. The contribution rates 336a and 336b of the heat transfer coefficient are shown, for example, as bar graphs, as the ratio (contribution rate) of the average heat transfer coefficient of each tube group to the average heat transfer coefficient of the entire group 16PA or 16PB of the tubes in the condenser 16. That is, the bar graphs show the contribution rate of the heat transfer coefficient as a percentage of the average heat transfer coefficient of each tube group within the group divided by the average heat transfer coefficient of the entire tubes in the condenser 16.

[0041] In the example shown in Fig. 7, the bar graphs of tube bundles whose contribution rate of the overall heat transmission coefficient exceeds 100% are shown in color (hatched areas in the figure). In this way, in the example of screen display information 300 shown in Fig. 7, the contribution rate of the overall heat transmission coefficient is shown in the form of a bar graph for each tube bundle, and is displayed in different colors depending on whether or not it exceeds the standard of 100%.

[0042] 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 contents.

[0043] 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 the group 16PA or the group 16PB divided inside the casing 16cav.

[0044] Here, Fig. 8 shows another example of screen display information generated by the display information generating unit 430 of the condenser state prediction device 18 according to the embodiment. In the example of the tube bank arrangement diagram 351 of the screen display information 301 shown in Fig. 8, tube banks whose contribution rate of the overall heat transfer coefficient exceeds 100% are colored (hatched areas in the diagram). In this case, for example, tube banks whose contribution rate of the overall heat transfer coefficient exceeds 100% based on the second calculation data are colored (hatched areas in the diagram). In this way, the tube bank arrangement diagram 351 may be displayed in different colors depending on whether the contribution rate exceeds 100% as a standard, similar to a bar graph display. Alternatively, it may simply function as a representation of the arrangement of the tube banks, as in the tube bank arrangement diagram 350.

[0045] 9 shows another example of screen display information generated by the display information generation unit 430 of the condenser state prediction device 18 according to the embodiment. The example shown in FIG. 9 shows a 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 bundle in a group to the tube wall thickness at the initial value (design value) for each tube bundle in 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.

[0046] 9, the screen display information 302 also includes group A (first calculation data) and group B (second calculation data), where group A shows a wall thickness remaining ratio 362a based on initial value (design value) data, and group B shows 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 allows the wall thickness remaining ratio to be displayed for each tube bank of the tubes 16P of the condenser 16. The screen display information 302 shown in FIG. 9 also includes, as display content, a state prediction result summary 340 that shows the data on which the predicted value is calculated and the calculation results. Furthermore, a condenser tube bank arrangement diagram 350 is included.

[0047] The remaining wall thickness ratios 362a and 362b shown in FIG. 9 are remaining wall thickness information represented 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 the tube 16P in the initial state (design value). Above and below the apex of the bar graph display, plots showing the maximum and minimum remaining wall thickness ratios within the tube group are displayed. In the example shown in FIG. 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 FIG. 9, a threshold line C indicating a predetermined value is displayed as the remaining wall thickness threshold at which replacing the tube or shutting off the tube is recommended.

[0048] 9, a tube group arrangement diagram 350 schematically shows 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 divided inside the casing 16cav.

[0049] Here, Fig. 10 shows another example of screen display information generated by the display information generating unit 430 of the condenser state prediction device 18 according to the embodiment. In the example of the tube bank arrangement diagram 352 of the screen display information 303 shown in Fig. 10, tube banks in which the wall thickness remaining ratio 362b based on the calculated wall thickness reduction rate exceeds the threshold line C are colored (hatched portions in the diagram). In this case, for example, tube banks in which the wall thickness remaining ratio exceeds the threshold line C based on the second calculation data are colored (hatched portions in the diagram). In this case, tube banks in which the wall thickness remaining ratio is below the threshold line C may be colored, or different colors may be used for cases in which the wall thickness remaining ratio exceeds the threshold line C. In this way, the tube bank arrangement diagram 352 may be displayed in different colors depending on whether the wall thickness remaining ratio is below the standard or exceeds it.

[0050] 7 to 10, the screen display information 300, 301, 302, and 303 further include a heat transmission coefficient display button 310, a wall thickness remaining rate 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 contribution rate of the heat transmission coefficient, and the wall thickness remaining rate display button 312 is a button that displays the screen display information 302 showing the calculation results of the wall thickness remaining rate.

[0051] The heat transmission coefficient display button 310 is highlighted in the screen display information 300. 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.

[0052] The calculation start button 314 is a button for instructing the start of calculation. The inspection history button 316 is a button for reflecting past inspection history data. The calculation start button 314 and the inspection history button 316 can also be selected with a mouse as the user interface 43, which will be described later.

[0053] 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 configured, for example, by a display device. The display unit may also be configured by a touch panel that functions as an input device that allows direct input to the screen as well as a display screen. Examples of the input device include a keyboard and a mouse.

[0054] The storage unit 44 is a storage medium that stores the temperature information and pressure information acquired by the measurement data acquisition unit 41, data and calculation results used in the calculations by the calculation unit 42, display data provided to the user via the user interface 43, display data templates, and the like. The storage unit 44 can be realized by, for example, a hard disk drive or a nonvolatile memory. The storage unit 44 may be physically separated from the condenser state prediction device 18, for example, via a network (not shown). The storage unit 44 has an input information storage unit 440, a measurement information storage unit 450, a program storage unit 460, a calculation result storage unit 470, a template storage unit 480, and a display information storage unit 490.

[0055] 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.

[0056] The measurement information storage unit 450 is a storage area that stores various pieces of 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, and the like.

[0057] 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. The display template is information that indicates the configuration of screen display information to be displayed on a display device (display unit) serving as the user interface 43, and, for example, the positions of graph display and numerical display 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.

[0058] (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.

[0059] The user interface 43 accepts input of parameters required for the calculation. Examples of the input parameters include the dimensions and material of the tubes 16P of the condenser 16, a tube correction coefficient CV that corrects the difference between the heat transfer coefficient of each tube 16P and the average heat transfer coefficient of the analysis result, the number of tubes 16P to which the supply of cooling water is 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 an input information storage unit 440 of the storage unit 44.

[0060] The measurement data acquisition unit 41 acquires, as measurement information, the cooling water inlet temperature T1, the cooling water outlet temperature T2, the condenser pressure P, the cooling water volume GW, and other operating data of the condenser 16 and the generator 15. When multiple cooling water temperature detectors 30 and multiple cooling water temperature detectors 31 are provided, 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 actual output data among the operating data using the following formula.

[0061]

number

[0062] 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.

[0063]

number

[0064] If the measurement data acquisition unit 41 cannot acquire the coolant outlet temperature T2, the specification calculation unit 400 may calculate the coolant outlet temperature T2 using the following formula.

[0065]

number

[0066] Here, an example is shown in which the tubes 16P of the condenser 16 are configured by two types of tubes, 16P1 and 16P2. The specification calculation unit 400 calculates the in-pipe flow velocity V1 of the tube 16P1 and the in-pipe flow velocity V2 of the tube 16P2 using the following equations based on the numbers N1 and N2 of the tubes 16P1 and 16P2 and the inner diameters di1 and di2 of the tubes 16P1 and 16P2, respectively (step S210).

[0067]

number

[0068]

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[0069] The overall heat transmission coefficient calculation unit 410 calculates the overall heat transmission 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 the pipes 16P1 and 16P2 in the HEI.

[0070] First, the heat transmission coefficient calculation unit 410 calculates the heat transmission coefficients Up1 and Up2 from a coolant flow velocity correction table based on the inner diameters di1 and di2 and in-pipe flow velocities V1 and V2 of pipes 16P1 and 16P2, respectively. The heat transmission coefficient calculation unit 410 also calculates a coolant temperature correction coefficient FW from an inlet temperature correction table based on the HEI. Furthermore, the heat transmission coefficient calculation unit 410 calculates a pipe material correction coefficient FM from the correction coefficient for the pipe material based on the HEI.

[0071] Next, the heat transmission coefficient calculation unit 410 uses the calculated heat transmission coefficients Up1 and Up2, the coolant temperature correction coefficient FW, and the pipe material correction coefficient FM to calculate corrected heat transmission coefficients U1 and U2 according to the following equations: Heat transmission coefficients U1 and U2 are the corrected heat transmission coefficients corresponding to pipes 16P1 and 16P2, respectively.

[0072]

number

[0073]

number

[0074] The overall heat transmission coefficient calculation unit 410 calculates the reference overall heat transmission coefficient Um from the overall heat transmission coefficients U1 and U2 using the following formula (step S220): The overall heat transmission coefficient Um is the theoretical reference overall heat transmission coefficient of the condenser 16 equipped with the two types of tubes 16P1 and 16P2.

[0075]

number

[0076] The heat transmission coefficient calculation unit 410 calculates the heat transmission coefficient U for each of the pipes 16P based on the calculated heat transmission coefficient Um and the pipe correction coefficient CV for each of the pipes 16P. Ai and the heat transfer coefficient U for each of the pipes 16P are calculated using the following formula (9) (step S230). Ai The total heat transfer coefficient is divided by the number of pipes in the 16P pipe to obtain the heat transfer coefficient U Ai The average value of these values is calculated (step S240).

[0077]

number

[0078]

number

[0079]

number

[0080]

number

[0081] Here, for example, the heat transmission coefficient of the tube group 16A1 (block A1 in the tube group layout diagram 350) shown in FIG. 5 is calculated by the formula (10) as follows: Ai The contribution rate of the heat transfer coefficient shown on the screen display information 300 in FIG. 7 is calculated by dividing the sum of the reference heat transfer coefficient U A This is the ratio of the thermal conductivity of each tube group (block) to the total heat transfer coefficient.

[0082] For example, the contribution rate of the heat transmission coefficient of the tube group 16A1 (block A1) shown in FIG. 7 is calculated by multiplying the heat transmission coefficient of the tube group 16A1 calculated by the formula (10) as described above by the reference heat transmission coefficient U A The contribution rate of the overall heat transmission coefficient for each tube group is calculated in a similar manner. As shown in Figures 7 and 8, the contribution rate of the overall heat transmission coefficient for each tube group is displayed as a bar graph. The contribution rate of the overall heat transmission coefficient is calculated by the overall heat transmission coefficient calculation unit 410.

[0083] Next, the heat transfer coefficient calculation unit 410 calculates the heat transfer coefficient K based on the actual measured value 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 ratio X.

[0084]

number

[0085]

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[0086] The heat transmission coefficient calculation unit 410 calculates the heat transmission coefficient K based on the actual measurement value of the actual device and the reference heat transmission coefficient U ABased on this, the cleanliness φ is calculated by the following formula: The overall heat transmission coefficient calculation unit 410 outputs the calculated cleanliness φ to the calculation result storage unit 470. As shown in Figs. 7 and 8, the cleanliness φ is displayed as a percentage in the condenser performance prediction result 330.

[0087]

number

[0088] Next, the heat transmission coefficient calculation unit 410 calculates a predicted value of the condenser internal pressure. The heat transmission coefficient calculation unit 410 calculates a theoretical reference heat transmission coefficient U AX Furthermore, the heat transmission coefficient calculation unit 410 calculates the reference heat transmission coefficient U AX Multiplying this by the cleanliness φ gives the predicted performance value of the heat transfer coefficient U A ' is calculated.

[0089]

number

[0090] Next, the heat transmission coefficient calculation unit 410 calculates the predicted performance value U A The logarithmic mean temperature difference θm' is calculated from the relational expression '. Then, the overall heat transmission coefficient calculation unit 410 calculates the saturation temperature TS' of the condenser using equation (19) based on the cooling water inlet temperature T1, the cooling water outlet temperature T2, and the calculated logarithmic mean temperature difference θm' (step S250).

[0091] Then, the overall heat transmission coefficient calculation unit 410 applies the calculated saturation temperature TS' to a steam table pre-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 transmission coefficient calculation unit 410 outputs the calculated internal pressure to the calculation result storage unit 470.

[0092]

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[0093]

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[0094]

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[0095] Next, the calculation operation of the metal thinning rate by the calculation unit 42 will be described in detail with reference to Fig. 12. Fig. 12 is a flowchart showing the calculation operation of the metal thinning rate calculation unit 420 of the condenser state prediction device 18 of the embodiment.

[0096] The wall-thickness reduction rate calculation unit 420 acquires the operating data from the measurement information storage unit 450 (step S270).

[0097] The wall-thinning rate calculation unit 420 calculates an integrated value of the plant operation time from the acquired operation data (step S280). Note that the wall-thinning rate calculation unit 420 may use a virtual operation time accepted via the user interface 43 as the integrated value.

[0098] The metal-reduction rate calculation unit 420 calculates the metal-reduction rate from the integrated value of the plant operating time using the following formula (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 approximated value (metal-reduction rate with respect to time) based on the results of an eddy current inspection test (ECT).

[0099]

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[0100]

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[0101] 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, as a percentage, the remaining proportion of the wall thickness of the tube 16P after the plant integrated 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.

[0102] (Overall operation of the 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.

[0103] The user interface 43 receives specification data for the condenser 16 from the user (step S110). Examples of the specification data received by the user interface 43 include dimensions, material, heat transfer coefficient data and the number of plugs, and a pipe material correction coefficient FM for the HEI, for the condenser tubes. 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.

[0104] Next, the measurement data acquisition unit 41 acquires temperature information relating 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, and the like, and outputs these to the measurement information storage unit 450 (step S120). The measurement data acquisition unit 41 may routinely store this information in the measurement information storage unit 450 and make it readable by the calculation unit 42.

[0105] In the initial state, the display information generating unit 430 generates screen display information 300 or 302 including initial values, values of the previous calculation, etc., and displays it on a display device or the like serving as the user interface 43. When the user selects, for example, the calculation start button 314 of the screen display information 300 with a mouse or the like serving as the user interface 43, the display information generating unit 430 generates screen display information that prompts the user to input or select calculation conditions for the calculation, and presents it to the user.

[0106] 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 Fig. 14, the user can input calculation conditions by selecting, with a mouse or the like, from among 100% load, 75% load, 50% load, and 25% load, which indicate the load on the steam turbine. Note that heat balance HB data, such as the cooling water inlet temperature T1, the cooling water outlet temperature T2, the amount of heat exchanged, and the amount of cooling water, are set in advance as input information based on the load on the steam turbine and stored in the input information storage unit 440.

[0107] Fig. 15 shows screen display information 304b that prompts the user to input calculation conditions based on past actual operation data. In the example shown in Fig. 15, the user can specify operation parameters for a specified date and time. Examples of operation 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.

[0108] Fig. 16 shows screen display information 305 that prompts the input of optional conditions when inputting calculation conditions based on the heat balance HB shown in Fig. 14 or calculation conditions based on past actual operation data shown in Fig. 15. In the example shown in Fig. 16, the data input based on the heat balance HB or past actual operation data can be corrected.

[0109] 17 shows screen display information 304c that prompts the user to input calculation conditions when arbitrarily setting the calculation conditions. In the example shown in FIG. 17, the calculation conditions can be input directly using the user interface 43 such as a keyboard.

[0110] Screen display information 304a prompting the user to input calculation conditions based on the existing heat balance HB value, screen display information 304b prompting the user to input calculation conditions based on past actual operation data, and screen display information 304c prompting the user to input calculation conditions as desired, each include a heat balance input button 320, a past data input button 322, and an optional setting button 324. By selecting any of these buttons through user interface 43, the user can display the selected screen display information and make the corresponding input or selection.

[0111] 18 shows screen display information 306a that prompts the user, after inputting the calculation conditions, to input whether or not there is a change in the specifications of the condenser 16. If the user selects Yes, the user can input basic specification data of the condenser 16 via a storage medium such as a USB memory as the user interface 43.

[0112] 19 is an example of basic specification data for the condenser 16. As shown in Fig. 19, the basic specification data 306b includes information for identifying the tubes 16P of the condenser 16 (tube bank symbol, tube bank number, tube bank row number, and tube bank row number), as well as information such as the presence or absence of a stopcock for stopping cooling water in the identified tube 16P, and the type of material used in re-tubing. The basic specification data 306b may be created as text data in CSV format, for example, and may be input via the user interface 43.

[0113] When the user selects, for example, the inspection history button 316 of the screen display information 302 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. Fig. 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.

[0114] An example of the inspection history data is shown in Fig. 21. As shown in Fig. 21, the inspection history data 308b includes a tube group symbol, a tube group number, a tube group row number, and a tube group row number that identify the tubes 16P of the condenser 16, as well as the wall remaining rate determined by ECT, the status of the shutoff valves, the status of recubing, and the like.

[0115] 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 the like as the user interface 43, the display information generation unit 430 generates screen display information that prompts the user to input or select calculation conditions for the calculation and presents it to the user.

[0116] 22 shows an example of screen display information 309 that prompts the user to input calculation conditions such as the time to predict wall thinning, the plant availability rate up to the prediction time, inspection records that serve as initial values for calculation, etc. The user can input these calculation conditions using a keyboard as the user interface 43 in accordance with the screen display information 309.

[0117] 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 the 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. by the calculation operation described above (step S130). The calculation unit 42 outputs the calculation results to the calculation result storage unit 470 of the storage unit 44.

[0118] FIG. 23 shows 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 FIG. 23, the calculation result 370, such as a predicted wall-thickness reduction rate, may include a tube bank symbol, a tube bank number, a tube bank row number, and a 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 a remaining wall-thickness ratio stored in the calculation result storage unit 470. The calculation result 370 may be generated as text data in, for example, CSV format. In this case, the user can output the calculation result 370 through the user interface 43.

[0119] Next, the display information generating unit 430 reads out the calculation results, such as the cleanliness level, the pressure inside the condenser, the contribution rate of the overall heat transmission coefficient, and the wall remaining rate, from the calculation result storing unit 470, and reads out a template of screen display information to be displayed on the display device serving as the user interface 43 from the template storing unit 480 (step S140). The display information generating unit 430 applies the calculation results to the template of screen display information to generate, for example, screen display information 300 or screen display information 302 (step S150).

[0120] The display information generation unit 430 sends any one of the generated screen display information 300-303 to a display device serving as the user interface 43 and outputs it to the user (step S160). The display information generation unit 430 also outputs any one of the generated screen display information 300-303 to the display information storage unit 490. The display unit serving as the user interface 43 reads out the generated screen display information from the display information storage unit 490 and displays it.

[0121] The user can obtain more detailed calculation results through a display device serving as user interface 43 on which screen display information 300 or screen display information 302 is displayed. FIG. 24 shows an example of screen display information 372 generated by display information generator 430 when, for example, the user selects, with a mouse or the like, the bar graph for tube group A2 showing wall thickness remaining ratio 362b in screen display information 302. In this embodiment, when, for example, the user selects a bar graph showing a wall thickness remaining ratio based on a wall thickness reduction rate in screen display information 302, display information generator 430 can generate screen display information 372 showing a distribution chart of the wall thickness remaining ratio of the corresponding tube group. As shown in FIG. 24, screen display information 372 includes a distribution chart of the wall thickness remaining ratio of each tube in tube group A2, with a reference value of 50%.

[0122] After outputting any one of screen display information 300 and screen display information 303, user interface 43 waits for input from the user (step S170). When the user selects 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), user interface 43 outputs the input information to input information storage unit 440. Furthermore, when input information is output from user interface 43, calculation unit 42 executes calculation processing based on the new calculation conditions, and display information generation unit 430 updates the screen display information (steps S130 to S160). Display information generation unit 430 outputs the updated screen display information to display information storage unit 490. The display unit serving as user interface 43 reads out the updated screen display information from display information storage unit 490 and displays it.

[0123] In the updated screen display information, the cleanliness 332b, condenser pressure 334b, and overall heat transfer coefficient contribution rate 336b, or wall thickness remaining rate 362b, which had previously been displayed for group B, are updated and displayed as cleanliness 332a, condenser pressure 334a, and overall heat transfer coefficient contribution rate 336a, or wall thickness remaining rate 362a for group A, and the calculation results calculated under the new calculation conditions are updated and displayed as cleanliness 332b, condenser pressure 334b, and overall heat transfer coefficient contribution rate 336b, or wall thickness remaining rate 362b for group B. In other words, the display for group A includes the calculation results under the calculation conditions (first calculation conditions) set before the calculation results updated with the new calculation conditions, and the display for group B includes the calculation results updated with the latest calculation conditions (second calculation conditions). The screen display using such screen display information makes it easy to visually compare the initial values or previous calculation results with the latest calculation results.

[0124] In this way, the condenser state prediction device 18 of the embodiment can calculate predicted values of the cleanliness of the condenser 16, the pressure inside the condenser, the overall heat transfer coefficient, the contribution rate of the overall heat transfer coefficient, the predicted wall thinning rate, and the 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 record, without undergoing a periodic inspection.

[0125] Furthermore, the condenser state prediction device 18 of the embodiment visually displays whether the contribution rate of the overall heat transfer coefficient and the wall remaining rate exceed the reference points, allowing the user to visually and easily grasp the number of tubes (tube bundles) that exceed the thresholds at any given time. This allows for smooth preparation of replacement parts for repairs of the condenser 16.

[0126] Furthermore, the condenser state prediction device 18 of the embodiment can display the contribution rate of overall heat transfer coefficient and the wall remaining rate while comparing them using any information or parameters. Therefore, by changing the information or parameters and repeating the calculations in the condenser state prediction device 18, the user can also understand the operating parameters for extending the life of the condenser 16 tubes.

[0127] Here, an example of the overall operation of the condenser state prediction device 18 of the embodiment will be described with reference to Fig. 25 and Figs. 26A to 26D. Fig. 25 is a flowchart showing an example of a user's operation for performance prediction using the condenser state prediction device 18 of the embodiment.

[0128] Here, an example will be described in which an operation is performed to predict the remaining wall thickness at a specific time point in the future by referring to the remaining wall thickness results based on past inspection data.

[0129] When the user specifies the actual machine to be predicted through the input device as the user interface 43 and selects the remaining wall rate display button 312 of the screen display information, the display information generating 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). Fig. 26A is an example of screen display information 302a showing the remaining wall rate 360 of a pipe.

[0130] 21 in accordance with the screen display information 308a shown in FIG. 20, the condenser state prediction device 18 imports the wall-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-remaining ratio included in the inspection history data 308b as wall-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-remaining information including the wall-remaining ratio of the inspection history data 308b.

[0131] Next, the user sets a period for predicting the wall thickness remaining rate (step S410). When the user inputs an estimated value for the plant operation cumulative time (period) through the input screen shown in screen display information 309 in Fig. 22 and selects calculation start button 314, wall thickness reduction rate calculation unit 420 calculates the wall thickness reduction rate (step S420). Display information generation unit 430 generates screen display information that includes, as wall thickness remaining rate 362b, the wall thickness remaining rate based on the wall thickness reduction rate calculated by wall thickness reduction rate calculation unit 420.

[0132] 26B shows screen display information 302b including wall thickness remaining ratio 362b calculated based on the plant operation cumulative time provided by the user. Screen display information 302b includes wall thickness remaining information including a wall thickness remaining ratio based on inspection history data 308b as wall thickness remaining ratio 362a, and wall thickness remaining information including a wall thickness remaining ratio based on a wall thickness thinning rate predicted based on the cumulative time provided by the user as wall thickness remaining ratio 362b. The user can learn the trend of wall thickness thinning of the pipe by referring to screen display information 302b, which compares the wall thickness remaining ratio at the time of inspection with the wall thickness remaining ratio based on the predicted wall thickness thinning rate.

[0133] The user can refer to the screen display information 302b, change the prediction period, and recalculate the metal-reduction rate under various conditions (Yes in step S430). When the user inputs a new assumed value through the input screen shown in the screen display information 309 of 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).

[0134] 22, the user inputs an estimated value for the accumulated time, and the wall-remaining rate calculation unit 420 calculates the wall-remaining rate based on the wall-remaining rate under the condition of the new estimated value. The display information generation unit 430 generates screen display information that includes the wall-remaining rate based on the wall-remaining rate based on the accumulated time given by the user in the previous prediction as wall-remaining rate 362a, and the wall-remaining rate based on the wall-remaining rate based on the accumulated time given by the user in the current prediction as wall-remaining rate 362b. This allows the user to compare and refer to the calculation results of the wall-remaining rate according to the given accumulated time.

[0135] The user can create a repair plan including a pipe closure plan based on the calculation result of the remaining wall thickness rate based on the wall thickness thinning rate of the pipe (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 wall thinning, or whether or not to retubing a pipe with advanced wall thinning, and includes the timing of application.

[0136] Next, an example of an operation for predicting the contribution rates of cleanliness, condenser pressure, and heat transfer coefficient when a planned repair plan is reflected will be explained, 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.

[0137] 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 contribution rate of the overall heat transmission coefficient, etc., based on the display template stored in the template storage unit 480 (step S450). Fig. 26C shows screen display information 302c showing the condenser state prediction result 330 based on the conditions at the time of design.

[0138] At this stage, the screen display information 302c initially includes cleanliness 332a, 332b, condenser internal pressure 334a, 334b, and overall heat transfer coefficient contribution rates 336a, 336b based on the design values of the condenser 16. In other words, the same graph is displayed for groups A and B.

[0139] Next, the user inputs parameters necessary 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. Furthermore, 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 necessary for the performance calculation include, for example, the heat balance HB and simulation data.

[0140] When the user selects the calculation start button 314 through the input device serving as the user interface 43, the overall heat transmission coefficient calculation unit 410 calculates the cleanliness, the condenser internal pressure, the overall heat transmission coefficient, and the contribution rate of the overall heat transmission coefficient (step S470). The display information generation unit 430 generates screen display information showing the performance information including the cleanliness, the condenser internal pressure, and the contribution rate of the overall heat transmission coefficient calculated by the overall heat transmission coefficient calculation unit 410.

[0141] 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, which are based on design values as initial values, and also includes cleanliness 332b, condenser pressure 334b, and overall heat transfer coefficient contribution rate 336b, which are calculated based on parameters including the number of shutoff valves and whether or not retubing is performed based on the planned shutoff plan. The user can refer to the screen display information 302d to 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 can learn the changes.

[0142] The user can refer to screen display information 302d and change the parameters to recalculate the cleanliness, condenser pressure, overall heat transmission coefficient, and overall heat transmission coefficient contribution rate under various conditions (Yes in step S480). When the user inputs new parameters through the input device serving as user interface 43 and selects calculation start button 314, overall heat transmission coefficient calculation unit 410 calculates the cleanliness, condenser pressure, overall heat transmission coefficient, and overall heat transmission coefficient contribution rate under the new conditions (steps S460 to S470).

[0143] In this way, users can visually grasp the changes in cleanliness, internal condenser pressure, and contribution rate of heat transfer coefficient that will accompany future tube repair plans, etc., and understand the impact that repair plans, etc. will have on the performance of the condenser.

[0144] According to the embodiment described above, it is 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.

[0145] 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 can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0146] 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 bundle, 16BinA, 16BinB...inlet box, 16BoutA, 16BoutB...exhaust box, 16WinA, 16WinB...inlet, 16WoutA, 16WoutB...exhaust, 16Wout...exhaust pipe, 16cav...casing, 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... memory 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 transfer 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 transfer coefficient Contribution rate of, 340...outline of condition prediction result, 350-352...pipe bank layout diagram, 360, 362a-362b...remaining wall thickness ratio, 370...calculation result, 372...screen display information, 400...specification calculation unit, 410...heat transfer coefficient 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

1. 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. 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.

3. 2. The condenser state prediction device according to claim 1, wherein 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.

4. 2. The condenser state prediction device according to claim 1, wherein 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.

5. 4. The condenser state prediction device according to claim 3, wherein the second calculation conditions are the latest calculation conditions, and the first calculation conditions are the calculation conditions that were set before the calculation result based on the second calculation conditions.

6. A measurement data acquisition unit that acquires at least one of the cooling water inlet temperature of the cooling water entering the pipe, the cooling water outlet temperature of the cooling water discharged from the pipe, and the accumulated 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.

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