JP4433869B2 - Steam turbine pressure calculation method, steam turbine efficiency calculation method, steam turbine pressure calculation program, and steam turbine efficiency calculation program - Google Patents

Description

  The present invention relates to a steam turbine pressure calculation method, a steam turbine efficiency calculation method, and a steam turbine in a steam turbine system that guides steam that has finished work in a high-pressure turbine to an intermediate-pressure turbine and guides steam that has finished work in an intermediate-pressure turbine to a low-pressure turbine. The present invention relates to a pressure calculation program and a steam turbine efficiency calculation program.

  Improving the thermal efficiency of thermal power plants is becoming increasingly important to save fuel and reduce power generation costs. For example, in a thermal power plant among thermal power plants, steam generated in a boiler is guided to a steam turbine, and the steam turbine is rotated to drive a generator. The work done by the steam in the steam turbine is converted into electrical energy by the generator. And the steam which finished work with the steam turbine is returned to water with a condenser, and water is supplied to a boiler with a water supply pump.

  Here, some steam turbine systems include a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine. The high-pressure turbine guides high-temperature and high-pressure steam from the boiler, and reheats the steam that has finished work in the high-pressure turbine. In order to increase the power generation efficiency, the steam that has been superheated at the intermediate pressure turbine is led to an intermediate pressure turbine, and the steam that has finished its work in the intermediate pressure turbine is guided to a low pressure turbine to effectively use high temperature and high pressure steam.

  As a thermal power plant, combined cycle power generation is a combination of a gas turbine and a steam turbine, and the exhaust heat from the gas turbine is guided to an exhaust heat recovery boiler, and the steam turbine is driven by the steam generated in the exhaust heat recovery boiler. There is a plant. Even in such a combined cycle power plant, some steam turbine systems include a high-pressure turbine, a medium-pressure turbine, and a low-pressure turbine. The high-temperature and high-pressure steam from the exhaust heat recovery boiler is effectively used to increase power generation efficiency. I am doing so.

  Managing the turbine efficiency of the steam turbine, which is one of the performance data of the thermal power plant, is important for improving the thermal efficiency of the thermal power plant. Here, the turbine efficiency E of the steam turbine is expressed by the following equation, where the turbine inlet steam enthalpy is H1, the turbine outlet steam enthalpy is H2, and the adiabatic enthalpy is H2a.

E = (H1-H2) / (H1-H2a)
The turbine inlet steam enthalpy H1, the turbine outlet steam enthalpy H2, and the heat insulation enthalpy H2a can be calculated from the turbine inlet steam pressure, the turbine outlet steam pressure, the turbine inlet steam temperature, and the turbine outlet steam temperature, respectively (for example, Patent Documents). 1).
JP-A-5-142001 ([0007])

  However, in a steam turbine system including a high pressure turbine, an intermediate pressure turbine, and a low pressure turbine, an inlet steam pressure detector, an outlet steam pressure detector, and an inlet steam temperature detection are respectively provided for the high pressure turbine, the intermediate pressure turbine, and the low pressure turbine. In some cases, the detector and the outlet steam temperature detector are not provided. For example, there are cases where a steam temperature detector and a steam pressure detector are not installed in the exhaust section of the intermediate pressure turbine. In this case, the outlet steam pressure and outlet steam temperature of the intermediate pressure turbine cannot be detected. The turbine efficiency of the turbine cannot be managed.

  It is possible to install a steam pressure detector or steam temperature detector in the exhaust section of this intermediate pressure turbine for the purpose of temporary measurement, but when these steam pressure detectors or steam temperature detectors are installed permanently Incurs installation costs and maintenance costs, and incurs costs for importing detected data into the computer.

  The object of the present invention is even when there is no installation of a steam pressure detector or a steam temperature detector at the inlet or outlet of any steam turbine of a steam turbine system including a high pressure turbine, an intermediate pressure turbine, and a low pressure turbine. To provide a steam turbine pressure calculation method, a steam turbine efficiency calculation method, a steam turbine pressure calculation program, and a steam turbine efficiency calculation program that can appropriately acquire the steam pressure and the steam temperature and obtain the efficiency of the steam turbine.

The steam turbine pressure calculation method according to the first aspect of the present invention is an inlet of a high-pressure turbine of a steam turbine system that guides steam that has finished work in a high-pressure turbine to an intermediate-pressure turbine and guides steam that has finished work in an intermediate-pressure turbine to a low-pressure turbine. Any three of the steam pressure, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine are detected, and the detected three steam pressures are converted into a steam pressure characteristic function {P (x) = A × b ^x + c} is substituted for P (x), and the number of turbine paragraphs at the steam pressure detection point position is substituted for x to obtain the constants a, b, and c of the steam pressure characteristic function. A steam pressure characteristic function is created by substituting the constants a, b, and c of the pressure characteristic function, and the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, and the low pressure turbine are added to x of the created steam pressure characteristic function. The steam pressure at the virtual detection point position is calculated by substituting the number of turbine stages at the virtual detection point position of the undetected steam pressure among the steam pressure at the inlet and the outlet steam pressure of the low-pressure turbine. .

A steam turbine pressure calculation method according to a second aspect of the invention is an inlet of a high-pressure turbine of a steam turbine system in which steam that has finished work in a high-pressure turbine is guided to an intermediate-pressure turbine and steam that has finished work in an intermediate-pressure turbine is guided to a low-pressure turbine. Any three of the steam pressure, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine are detected, and the detected three steam pressures are converted into a steam pressure characteristic function {P (x) = A × b ^x + c} is substituted for P (x), and the number of turbine paragraphs at the steam pressure detection point position is substituted for x to obtain the constants a, b, and c of the steam pressure characteristic function. A steam pressure characteristic function is created by substituting the constants a, b, and c of the pressure characteristic function, and x of the created steam pressure characteristic function expression is replaced with the high pressure turbine inlet steam pressure, the medium pressure turbine inlet steam pressure, and the low pressure turbine. By substituting the number of turbine stages at the virtual detection point position of the undetected steam pressure out of the inlet steam pressure of the bin and the outlet steam pressure of the low-pressure turbine, the steam pressure at the virtual detection point position is determined for the undetected steam pressure. Calculate and correct the steam pressure characteristic function so that the calculated steam pressure matches the steam pressure at the virtual detection point detected by the temporary steam pressure detector or the design value of the steam pressure, and use the corrected steam pressure characteristic function. Thus, the steam pressure at the virtual detection point position is calculated.

The steam turbine efficiency calculation method according to the invention of claim 3 is an inlet of a high-pressure turbine of a steam turbine system that guides steam that has finished work in a high-pressure turbine to an intermediate-pressure turbine and guides steam that has finished work in an intermediate-pressure turbine to a low-pressure turbine. Any three of the steam pressure, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine are detected, and the detected three steam pressures are converted into a steam pressure characteristic function {P (x) = A × b ^x + c} is substituted for P (x), and the number of turbine paragraphs at the steam pressure detection point position is substituted for x to obtain the constants a, b, and c of the steam pressure characteristic function. A steam pressure characteristic function is created by substituting the constants a, b, and c of the pressure characteristic function, and the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, and the low pressure turbine are added to x of the created steam pressure characteristic function. The steam pressure at the virtual detection point position is determined for the undetected steam pressure by substituting the number of turbine stages at the virtual detection point position of the undetected steam pressure among the steam pressure at the inlet and the outlet steam pressure of the low-pressure turbine. The efficiency of the steam turbine near the virtual detection point position is calculated based on the calculated metal temperature of the steam turbine near the virtual detection point position and the calculated steam pressure.

A steam turbine efficiency calculating method according to a fourth aspect of the invention is an inlet of a high-pressure turbine of a steam turbine system that guides steam that has finished work in a high-pressure turbine to an intermediate-pressure turbine and guides steam that has finished work in an intermediate-pressure turbine to a low-pressure turbine. Any three of the steam pressure, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine are detected, and the detected three steam pressures are converted into a steam pressure characteristic function {P (x) = A × b ^x + c} is substituted for P (x), and the number of turbine paragraphs at the steam pressure detection point position is substituted for x to obtain the constants a, b, and c of the steam pressure characteristic function. A steam pressure characteristic function is created by substituting the constants a, b, and c of the pressure characteristic function, and the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, and the low pressure turbine are added to x of the created steam pressure characteristic function. The steam pressure at the virtual detection point position is determined for the undetected steam pressure by substituting the number of turbine stages at the virtual detection point position of the undetected steam pressure among the steam pressure at the inlet and the outlet steam pressure of the low-pressure turbine. Calculate and correct the steam pressure characteristic function so that the calculated steam pressure matches the steam pressure at the virtual detection point detected by the temporary steam pressure detector or the design value of the steam pressure, and use the corrected steam pressure characteristic function. The steam pressure at the virtual detection point position is calculated for the undetected steam pressure, and the steam turbine near the virtual detection point position is calculated based on the metal temperature of the steam turbine near the virtual detection point position and the calculated steam pressure. It is characterized by calculating efficiency.

The steam turbine pressure calculation program according to the invention of claim 5 calculates the steam pressure of the steam turbine system that guides the steam that has finished the work in the high-pressure turbine to the intermediate-pressure turbine and guides the steam that has finished the work in the intermediate-pressure turbine to the low-pressure turbine. In order to do this, the computer inputs means for inputting three of the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine; Substituting the pressure into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the turbine stage number at the position of the steam pressure detection point into x, the constant a of the steam pressure characteristic function, Means for obtaining b, c, means for creating the steam pressure characteristic function by substituting the obtained values into a, b, c of the steam pressure characteristic function, and x for the created steam pressure characteristic function Substituting the number of turbine stages at the virtual detection point position of the steam pressure that was not input among the inlet steam pressure of the pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine, It is made to function as a means to calculate the steam pressure in the virtual detection point position about the steam pressure which was not input.

The steam turbine pressure calculation program according to claim 6 is for calculating the steam pressure of the steam turbine system that guides the steam that has finished the work in the high-pressure turbine to the medium-pressure turbine and guides the steam that has finished the work in the medium-pressure turbine to the low-pressure turbine. A computer for inputting three of the inlet steam pressure of the high-pressure turbine, the inlet steam pressure of the medium-pressure turbine, the inlet steam pressure of the low-pressure turbine and the outlet steam pressure of the low-pressure turbine; Substituting P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the turbine stage number at the position of the steam pressure detection point for x, constants a, b, means for obtaining c, means for substituting the obtained values into a, b, and c of the steam pressure characteristic function to create a steam pressure characteristic function, and x of the created steam pressure characteristic function Input by substituting the number of turbine stages at the virtual detection point position of the steam pressure that was not input among the inlet steam pressure of the bin, the inlet steam pressure of the medium pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine. Means for calculating the steam pressure at the virtual detection point position for the steam pressure that has not been performed, means for inputting the steam pressure at the virtual detection point position detected by the temporary steam pressure detector, and the calculated steam pressure is the temporary steam pressure Means for correcting the steam pressure characteristic function so as to match the steam pressure or the steam pressure design value at the virtual detection point position detected by the detector, and the steam pressure at the virtual detection point position using the corrected steam pressure characteristic function It is made to function as a means to calculate.

The steam turbine efficiency calculation program according to the invention of claim 7 is a steam turbine efficiency in a steam turbine system that guides steam that has finished work in a high-pressure turbine to an intermediate-pressure turbine and guides steam that has finished work in an intermediate-pressure turbine to a low-pressure turbine. The computer inputs a means for inputting any three of the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine. Substituting two steam pressures into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the number of turbine paragraphs at the steam pressure detection point position into x is a constant of the steam pressure characteristic function Means for obtaining a, b, c, means for creating a steam pressure characteristic function by substituting the obtained values into a, b, c of the steam pressure characteristic function, and the created steam pressure characteristic function The number of turbine paragraphs at the virtual detection point position of the steam pressure that was not input among the x steam of the high pressure turbine, the inlet steam pressure of the medium pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine Substituting, the means for calculating the steam pressure at the virtual detection point position for the steam pressure not input, and the virtual detection point position based on the metal temperature of the steam turbine near the virtual detection point position and the calculated steam pressure It functions as a means for calculating the efficiency of a nearby steam turbine.

The steam turbine efficiency calculation program according to the invention of claim 8 is an efficiency of a steam turbine in a steam turbine system that guides steam that has finished work in a high-pressure turbine to an intermediate-pressure turbine and guides steam that has finished work in an intermediate-pressure turbine to a low-pressure turbine. The computer inputs a means for inputting any three of the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine. Substituting two steam pressures into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the number of turbine paragraphs at the steam pressure detection point position into x is a constant of the steam pressure characteristic function Means for obtaining a, b, c, means for creating a steam pressure characteristic function by substituting the obtained values into a, b, c of the steam pressure characteristic function, and the created steam pressure characteristic function The number of turbine paragraphs at the virtual detection point position of the steam pressure that was not input among the x steam of the high pressure turbine, the inlet steam pressure of the medium pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine , Means for calculating the steam pressure at the virtual detection point position for the steam pressure not input, means for inputting the steam pressure at the virtual detection point position detected by the temporary steam pressure detector, and the calculated steam Means for correcting the steam pressure characteristic function so that the pressure coincides with the steam pressure at the virtual detection point position detected by the temporary steam pressure detector or the design value of the steam pressure, using the corrected steam pressure characteristic function, the virtual detection point Means for calculating the steam pressure at the position, and the steam pressure calculated using the steam turbine metal temperature near the virtual detection point position and the corrected steam pressure characteristic function. There are, characterized in that to function as means for calculating the efficiency of the steam turbine in the vicinity of the virtual detection point position.

  According to the present invention, even if there is no installation of a steam pressure detector or a steam temperature detector at the inlet or outlet of any steam turbine of a steam turbine system including a high pressure turbine, an intermediate pressure turbine, and a low pressure turbine. The steam pressure and steam temperature can be properly acquired, and the efficiency of the steam turbine can be obtained. Therefore, the efficiency of the steam turbine can be managed, which can be used for accurate maintenance and maintenance.

  FIG. 1 is a flowchart showing a steam turbine pressure calculation method according to the first embodiment of the present invention, and FIG. 2 shows a steam turbine system to which the steam turbine pressure calculation method according to the first embodiment of the present invention is applied. FIG. 3 is a block diagram of a computer that performs arithmetic processing of the steam turbine pressure calculation method.

  First, a steam turbine system to which the steam turbine pressure calculation method of the present invention is applied will be described. As shown in FIG. 2A, the steam turbine system includes a high pressure turbine 11, an intermediate pressure turbine 12, and a low pressure turbine 13, and a reheater 14 between the high pressure turbine 11 and the intermediate pressure turbine 12. ing. Steam generated by the steam generator is introduced into the high-pressure turbine 11, and the steam that has finished work in the high-pressure turbine 11 is superheated by the reheater 14 and guided to the intermediate-pressure turbine 12. The steam that has finished work in the intermediate pressure turbine 12 is guided to the low-pressure turbine 13, and after the work is completed in the low-pressure turbine 13, the steam is guided to the condenser.

  In such a steam turbine system, steam pressure detectors 15a to 15d and steam temperature detectors 16a to 16d are usually provided at the inlet of the high pressure turbine 11, the outlet of the high pressure turbine, the inlet of the intermediate pressure turbine 12, and the outlet of the low pressure turbine, respectively. The steam pressure detector and the steam temperature detector are not provided in the exhaust part of the intermediate pressure turbine 12. This is because the steam pressure and steam temperature in the exhaust section of the intermediate pressure turbine 12 are rarely used for monitoring control. Further, metal temperature detectors 17 a and 17 b are provided on the stationary blades of the high-pressure turbine 11 and the intermediate-pressure turbine 12.

  The turbine efficiency of the high-pressure turbine 11 is determined based on the inlet steam pressure of the high-pressure turbine 11 detected by the steam pressure detector 15a, the inlet steam temperature of the high-pressure turbine 11 detected by the steam temperature detector 16a, and the steam pressure detector 15b ′. Is calculated on the basis of the outlet steam pressure of the high-pressure turbine 11 detected in step S1 and the outlet steam temperature of the high-pressure turbine 11 detected by the steam temperature detector 16b ′.

  On the other hand, the turbine efficiency of the intermediate pressure steam turbine 12 is based on the inlet steam pressure of the intermediate pressure turbine 12, the inlet steam temperature of the intermediate pressure turbine 12, the outlet steam pressure of the intermediate pressure turbine 12, and the outlet steam temperature of the intermediate pressure turbine 12. As shown in FIG. 2A, the steam pressure detector for detecting the outlet steam pressure of the intermediate pressure turbine 12 and the steam for detecting the outlet steam temperature of the intermediate pressure turbine 12 are calculated. No temperature detector is provided. The steam temperature detector for detecting the outlet steam temperature of the intermediate pressure turbine 12 is detected by the metal temperature detector 17b because the stationary blade of the intermediate pressure turbine 12 is provided with the metal temperature detector 17b. The metal temperature can be used as the outlet steam temperature of the intermediate pressure turbine 12, but the outlet steam pressure of the intermediate pressure turbine 12 cannot be detected.

  Therefore, the steam turbine pressure calculation method according to the first embodiment of the present invention is a method in which the steam pressure detector in such a steam turbine system is not provided, for example, steam at the exhaust section of the intermediate pressure turbine 12. The pressure is calculated. In FIG. 2A, a reheater 14 is provided between the high-pressure turbine 11 and the intermediate-pressure turbine 12. However, for convenience of explanation, as shown in FIG. A steam turbine system that does not have the vessel 14 will be described. In the steam turbine system shown in FIG. 2B, the steam is not re-superheated by the reheater 14, so that the steam pressure at the exhaust portion of the high-pressure turbine 11 becomes the steam pressure at the inlet of the intermediate-pressure turbine 12. Moreover, in FIG.2 (b), illustration of the steam temperature detectors 16a-16c and the metal temperature detectors 17a and 17b is abbreviate | omitted. This is because the steam turbine pressure calculation method according to the first embodiment does not require the temperatures detected by the steam temperature detectors 16a to 16c and the metal temperature detectors 17a and 17b.

  In FIG. 2B, the inlet steam pressure of the high-pressure turbine 11 detected by the steam pressure detector 15a, the inlet steam pressure of the intermediate-pressure turbine 12 detected by the steam pressure detector 15b, and the steam pressure detector 15c. The outlet steam pressure of the low-pressure turbine 13 is input to the computer 18, and the steam pressure at the exhaust part of the intermediate-pressure turbine 12, which is a location where the steam pressure detector is not provided, is calculated by calculation processing of the computer 18. .

  FIG. 3 is a block diagram of the computer 18. The inlet steam pressure of the high pressure turbine 11 detected by the steam pressure detector 15a, the inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b, and the outlet steam of the low pressure turbine 13 detected by the steam pressure detector 15c. The pressure is input by the process input device 19 of the computer 18, arithmetically processed by the arithmetic processing device 20, and stored in the storage device 21.

  The arithmetic processing unit 20 is a turbine stage from the high pressure turbine 11 to the low pressure turbine 13 based on the inlet steam pressure of the high pressure turbine 11, the inlet steam pressure of the intermediate pressure turbine 12, and the outlet steam pressure of the low pressure turbine 13 stored in the storage device 21. The steam pressure curve for the number is obtained, the obtained steam pressure curve is stored in the storage device, and is output to the input / output device 23 via the input / output processing device 22 as necessary. And the steam pressure of the location where the steam pressure detector input from the input / output device 23 is not provided is calculated | required from a steam pressure curve, and it outputs to the input / output device 23 as needed.

  That is, as shown in FIG. 1, the arithmetic processing unit 20 includes an inlet steam pressure of the high pressure turbine 11 detected by the steam pressure detector 15a, an inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b, The steam pressure at the outlet of the low-pressure turbine 13 detected by the steam pressure detector 15c is input (S1), and the three steam pressures thus input are converted to P of the steam pressure characteristic function P (x) expressed by the following equation (1). Substituting for (x) and substituting the number of turbine paragraphs at the steam pressure detection point for x, the constants a, b, and c in equation (1) are determined (S2).

P (x) = a × b ^x + c (1)
Here, the number of turbine stages at the steam pressure detection point position to be substituted for x is as follows. For example, when the high-pressure turbine 11 has 12 stages, the intermediate-pressure turbine 12 has 9 stages, and the low-pressure turbine 13 has 5 stages, the high-pressure turbine 11 to the low-pressure turbine The number of turbine stages up to 13 is 26. Therefore, the number of stages corresponding to the inlet steam pressure of the high-pressure turbine 11 detected by the steam pressure detector 15a is 0, and the number of stages corresponding to the inlet steam pressure of the intermediate-pressure turbine 12 detected by the steam pressure detector 15b is 12 stages. The number of stages corresponding to the outlet steam pressure of the low-pressure turbine 13 detected by the steam pressure detector 15c is 26 stages.

  In this way, when these three input steam pressures are substituted into P (x) in the equation (1), and the turbine stage number corresponding to these three input steam pressures is substituted into x, three simultaneous equations are obtained. Therefore, the simultaneous equations are solved to obtain a, b, and c in the equation (1). Then, the steam pressure characteristic function P (x) is created by substituting the obtained values into the constants a, b, and c in the equation (1) (S3). In step S3, the constants a, b and c are determined from the three actually measured steam pressures to create the steam pressure characteristic function P (x) so that it can be applied to steam turbine systems having different steam conditions. It is to make it.

  Next, the steam pressure at the virtual detection point position is calculated by substituting the number of turbine stages where the steam pressure detector is not provided in x of the steam pressure characteristic function P (x) created in step S3. calculate. For example, in order to obtain the steam pressure of the exhaust part of the intermediate pressure turbine 12 where the steam pressure detector is not provided, the high pressure turbine 11 has 12 stages and the intermediate pressure turbine 12 has 9 stages. Since it has the number of paragraphs, 21 which is the number of last paragraphs of the intermediate pressure turbine 12 is substituted for x. Thereby, the steam pressure of the exhaust part of the intermediate pressure turbine 12 is calculated (S4).

  FIG. 4 is a characteristic diagram of a characteristic curve according to an example of the steam pressure characteristic function P (x) obtained in step S3. In FIG. 4, the detected steam pressure of the high pressure turbine 11 is about 252000 [hPa] in the steam turbine system having 26 stages of turbine stages from the high pressure turbine 11 to the low pressure turbine 13, and the input steam pressure of the intermediate pressure turbine 12. Is about 39000 [hPa], and the outlet steam pressure of the low-pressure turbine 13 is about 50 [hPa]. In addition, when the steam turbine system has the reheater 14 as shown in FIG. 2A, the pressure change accompanying the overheating by the reheater 14 is corrected. Since the correction is based on the inlet steam pressure of the intermediate-pressure turbine 12, the inlet steam pressure of the high-pressure turbine 11 is corrected.

  In order to calculate the steam pressure at the virtual detection point position from the steam pressure characteristic function P (x), the number of paragraphs at the virtual detection point position to be obtained is substituted into x. For example, in order to obtain the steam pressure of the exhaust part of the intermediate pressure turbine 12 where the steam pressure detector is not provided, 21 which is the final paragraph number of the intermediate pressure turbine 12 is substituted for x. Thereby, it can be calculated that the steam pressure in the exhaust part of the intermediate pressure turbine 12 is about 7500 [hPa].

  In the above description, the case where the steam pressure detector is not provided in the exhaust portion of the intermediate pressure turbine 12 has been described. However, as shown in FIG. 5, the steam pressure detector 15 d is provided in the exhaust portion of the intermediate pressure turbine 12. Even if the steam pressure detector is not provided in the exhaust part of the high-pressure turbine 11, the steam pressure in the exhaust part of the high-pressure turbine 11 can be calculated similarly. That is, a steam pressure characteristic function is created by detecting the inlet steam pressure of the high pressure turbine 11, the outlet steam pressure of the intermediate pressure turbine 12, and the outlet steam pressure of the low pressure turbine 13, and the detection position to be obtained from the created steam pressure characteristic function is determined. Specify the number of turbine paragraphs to find the steam pressure at that point.

  According to the first embodiment, when the steam pressure detector 15 is not installed at the inlet or outlet of any steam turbine of the steam turbine system including the high pressure turbine 11, the intermediate pressure turbine 12, and the low pressure turbine 13. Even if it exists, the steam pressure of the location can be acquired.

  Next, a second embodiment of the present invention will be described. FIG. 6 is a flowchart showing a steam turbine pressure calculating method according to the second embodiment of the present invention, and FIG. 7 is a diagram of a steam turbine system to which the steam turbine pressure calculating method according to the second embodiment of the present invention is applied. It is a system configuration | structure figure. This second embodiment is different from the first embodiment in that a temporary steam pressure detector is installed at a location where no steam pressure detector is installed, and the steam pressure calculated by the steam pressure characteristic function is temporarily set. The steam pressure characteristic function is corrected so that it matches the steam pressure detected by the steam pressure detector of, or the steam pressure design value, and the steam pressure at the virtual detection point position is calculated using the corrected steam pressure characteristic function. It is a thing.

Table 1 shows the steam pressure measured using a temporary steam pressure detector at a location where no steam pressure detector is installed in a thermal power plant, and the steam pressure calculated using the steam pressure characteristic function. It is a table | surface which shows the difference (measured value-calculated value) with a value. This shows the case where 32 measurements were taken over the course of one year. The steam pressure was measured at the location where the steam pressure detector was not installed, and the steam pressure at three locations where the steam pressure detector was installed. And the calculated value of the steam pressure at the location where the steam pressure detector is not installed is obtained from the steam pressure characteristic function, and (measured value−calculated value) is tabulated.

  As can be seen from Table 1, the average value of the difference between the measured value and the calculated value (measured value−calculated value) is 1228 [hPa], and its standard deviation is 22.6 [hPa]. When the difference between the measured value and the calculated value (measured value-calculated value) is not negligible, the steam pressure is calculated so that the steam pressure calculated by the steam pressure characteristic function matches the steam pressure detected by the temporary steam pressure detector. Correct the characteristic function. For example, the steam pressure value of paragraph number 21 of the steam pressure characteristic function shown in FIG. 4 is translated so as to coincide with the measured value.

  In FIG. 7, compared to FIG. 2B, a steam pressure detector 15 a that detects the inlet steam pressure of the high-pressure turbine 11, a steam pressure detector 15 b that detects the inlet steam pressure of the intermediate-pressure turbine 12, and the outlet of the low-pressure turbine 13. In addition to the steam pressure detector 15 c that detects the steam pressure, a temporary steam pressure detector 15 X is provided in the exhaust section of the intermediate pressure turbine 12. The temporary steam pressure detector 15X is temporarily attached during regular inspection of the steam turbine system, and is removed during normal operation. That is, when obtaining the steam pressure characteristic function, the inlet steam pressure of the high pressure turbine 11 detected by the steam pressure detector 15a, the inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b, and the steam pressure detector. In addition to the outlet steam pressure of the low-pressure turbine 13 detected at 15c, the steam pressure detected by the temporary steam pressure detector 15X is input to the computer 18.

  In the computer 18, as shown in FIG. 6, the inlet steam pressure of the high pressure turbine 11 detected by the steam pressure detector 15a, the inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b, and the steam pressure detector. The outlet steam pressure of the low-pressure turbine 13 detected in 15c is input (S1), and constants a, b, and b of the steam pressure characteristic function P (x) expressed by the equation (1) based on the three input steam pressures are input. c is obtained (S2). Then, a steam pressure characteristic function P (x) is created (S3), and based on the created steam pressure characteristic function P (x), the steam pressure of the exhaust section of the intermediate pressure turbine 12 where no steam pressure detector is installed. Is calculated (S4).

  Further, the steam pressure characteristic function is corrected so that the steam pressure calculated in step S4 matches the steam pressure at the virtual detection point position detected by the temporary steam pressure detector 15X (S5), and the corrected steam pressure characteristic function is By using this, the steam pressure in the exhaust part of the intermediate pressure turbine 12 without the steam pressure detector is calculated (S6).

  Here, the correction of the steam pressure characteristic function is performed, for example, by calculating the difference between the calculated steam pressure and the steam pressure detected by the temporary steam pressure detector 15X, and the steam pressure at the virtual detection point position in the steam pressure characteristic function. The characteristic curve determined by the steam pressure characteristic function is translated by the difference so that becomes the steam pressure detected by the temporary steam pressure detector 15X. Thereby, the steam pressure at the virtual detection point position determined by the steam pressure characteristic function matches the actual measurement value, so that the steam pressure can be calculated more accurately at the location where the steam pressure detector is not installed.

  In the above description, the steam pressure characteristic function is corrected so as to coincide with the steam pressure at the virtual detection point position detected by the temporary steam pressure detector 15X, but the steam pressure design value may be used. . Moreover, although the case where the steam pressure detector was not provided in the exhaust part of the intermediate pressure turbine 12 was demonstrated, as shown in FIG. 8, the steam pressure detector 15d is provided in the exhaust part of the intermediate pressure turbine 12. However, even when the steam pressure detector is not provided in the exhaust part of the high-pressure turbine 11, the steam pressure characteristic function can be corrected similarly by providing a temporary steam pressure detector 15 X in the exhaust part of the high-pressure turbine 11. .

  That is, a steam pressure characteristic function is created by detecting the inlet steam pressure of the high pressure turbine 11, the outlet steam pressure of the intermediate pressure turbine 12, and the outlet steam pressure of the low pressure turbine 13, and the detection position to be obtained from the created steam pressure characteristic function is determined. The steam pressure is determined by specifying the number of turbine stages, and the steam pressure is calculated so that the calculated steam pressure matches the steam pressure at the virtual detection point detected by the temporary steam pressure detector 15X or the steam pressure design value. The pressure characteristic function is corrected, and the steam pressure in the exhaust part of the high-pressure turbine 11 in which the steam pressure detector is not installed is calculated using the corrected steam pressure characteristic function.

  According to the second embodiment, the temporary steam pressure detector 15X is provided to correct the steam pressure characteristic function, and the corrected steam pressure characteristic function is used to correct the location where the steam pressure detector 15 is not installed. Since the vapor pressure is acquired, the vapor pressure at a location where the vapor pressure detector 15 is not installed can be calculated more accurately.

  Next, a third embodiment of the present invention will be described. FIG. 9 is a flowchart showing a steam turbine efficiency calculation method according to the third embodiment of the present invention, and FIG. 10 shows a steam turbine system to which the steam turbine efficiency calculation method according to the third embodiment of the present invention is applied. It is a system configuration | structure figure. In the third embodiment, the steam pressure detector 15 and the steam temperature detector 16 are not installed based on the steam pressure at the location where the steam pressure detector 15 calculated in the first embodiment is not installed. The efficiency of the steam turbine at the location is calculated.

  In FIG. 10, in contrast to FIG. 2B, the computer 18 includes an inlet steam pressure of the high-pressure turbine 11 detected by the steam pressure detector 15a and an inlet steam of the intermediate-pressure turbine 12 detected by the steam pressure detector 15b. In addition to the outlet steam pressure of the low-pressure turbine 13 detected by the pressure and steam pressure detector 15c, the metal temperature from the metal temperature detector 17b of the stationary blade of the intermediate-pressure turbine 12 is input.

  In the computer 18, as shown in FIG. 9, the inlet steam pressure of the high pressure turbine 11 detected by the steam pressure detector 15a, the inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b, and the steam pressure detector. The outlet steam pressure of the low-pressure turbine 13 detected at 15c and the metal temperature of the intermediate-pressure turbine 12 detected by the metal temperature detector 17b are input (S1), and the formula (1) is based on the input three steam pressures. The constants a, b, and c of the steam pressure characteristic function P (x) indicated by (2) are obtained (S2). Then, a steam pressure characteristic function P (x) is created (S3), and based on the created steam pressure characteristic function P (x), the steam pressure of the exhaust section of the intermediate pressure turbine 12 where no steam pressure detector is installed is determined. Calculate (S4). Furthermore, the metal temperature of the stationary blade of the intermediate pressure turbine 12 is acquired from the metal temperature detector 17b, and the metal temperature is used as the outlet steam temperature of the intermediate pressure steam turbine. That is, based on the metal temperature acquired from the metal temperature detector 17b and the steam pressure calculated in step S4, the efficiency of the intermediate pressure turbine 12 without the steam pressure detector and the steam temperature detector is calculated (S5).

  In the above description, the case where the steam pressure detector is not provided in the exhaust part of the intermediate pressure turbine 12 has been described. However, as shown in FIG. 11, the steam pressure detector 15 d is provided in the exhaust part of the intermediate pressure turbine 12. Although provided, the efficiency of the high-pressure turbine 11 can be calculated in the same manner even when the steam pressure detector is not provided in the exhaust portion of the high-pressure turbine 11. That is, a steam pressure characteristic function is created by detecting the inlet steam pressure of the high pressure turbine 11, the outlet steam pressure of the intermediate pressure turbine 12, and the outlet steam pressure of the low pressure turbine 13, and the detection position to be obtained from the created steam pressure characteristic function is determined. The steam pressure at that location is determined by designating the number of turbine stages, and the metal temperature from the metal temperature detector 17a of the high-pressure turbine 11 is obtained, and the efficiency of the high-pressure turbine 11 based on the metal temperature and the calculated steam pressure. Is calculated.

  According to the third embodiment, the steam pressure detector 15 or the steam temperature detector 16 is provided at the inlet or outlet of any steam turbine of the steam turbine system including the high pressure turbine 11, the intermediate pressure turbine 12, and the low pressure turbine 13. Even if there is no installation, the efficiency of the steam turbine in the vicinity of the location can be calculated.

  Next, a fourth embodiment of the present invention will be described. FIG. 12 is a flowchart showing a steam turbine efficiency calculation method according to the fourth embodiment of the present invention, and FIG. 13 shows a steam turbine system to which the steam turbine efficiency calculation method according to the fourth embodiment of the present invention is applied. It is a system configuration | structure figure. This fourth embodiment is different from the third embodiment in that a temporary steam pressure detector is installed at a location where no steam pressure detector is installed, and the steam pressure calculated by the steam pressure characteristic function is temporarily set. Correct the steam pressure characteristic function so that it matches the steam pressure detected by the steam pressure detector, calculate the steam pressure at the virtual detection point using the corrected steam pressure characteristic function, and use the steam pressure. In this way, the efficiency of the steam turbine is calculated.

  In FIG. 13, a temporary steam pressure detector 15 </ b> X is provided in the exhaust section of the intermediate pressure turbine 12 with respect to FIG. 10. The temporary steam pressure detector 15X is temporarily attached at the time of periodic inspection of the steam turbine system and is removed during normal operation.

  That is, when obtaining the steam pressure characteristic function, the computer 18 includes the inlet steam pressure of the high pressure turbine 11 detected by the steam pressure detector 15a and the inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b. In addition to the outlet steam pressure of the low pressure turbine 13 detected by the steam pressure detector 15c and the metal temperature from the metal temperature detector 17b of the stationary blade of the intermediate pressure turbine 12, the high pressure turbine 11 detected by the steam pressure detector 15a. In addition to the inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b, the outlet steam pressure of the low pressure turbine 13 detected by the steam pressure detector 15c, the temporary steam pressure detector 15X The steam pressure detected at is input.

  In the computer 18, as shown in FIG. 12, the inlet steam pressure of the high pressure turbine 11 detected by the steam pressure detector 15a, the inlet steam pressure of the intermediate pressure turbine 12 detected by the steam pressure detector 15b, and the steam pressure detector. The outlet steam pressure of the low-pressure turbine 13 detected at 15c and the metal temperature of the intermediate-pressure turbine 12 detected by the metal temperature detector 17b are input (S1), and the formula (1) is based on the input three steam pressures. The constants a, b, and c of the steam pressure characteristic function P (x) indicated by (2) are obtained (S2). Then, a steam pressure characteristic function P (x) is created (S3), and based on the created steam pressure characteristic function P (x), the steam pressure of the exhaust section of the intermediate pressure turbine 12 where no steam pressure detector is installed is determined. Calculate (S4).

  Further, the steam pressure characteristic function is corrected so that the steam pressure calculated in step S4 matches the steam pressure at the virtual detection point position detected by the temporary steam pressure detector 15X (S5), and the corrected steam pressure characteristic function is The steam pressure of the exhaust part of the intermediate pressure turbine 12 without the steam pressure detector is calculated (S6). And the metal temperature of the stationary blade of the intermediate pressure turbine 12 is acquired from the metal temperature detector 17b, and the metal temperature is used as the outlet steam temperature of the intermediate pressure steam turbine. That is, based on the metal temperature acquired from the metal temperature detector 17b and the steam pressure calculated by the steam pressure characteristic function corrected in step S6, the intermediate pressure turbine 12 without the steam pressure detector and the steam temperature detector installed. Is calculated (S7).

  In the above description, the steam pressure characteristic function is corrected so as to coincide with the steam pressure at the virtual detection point position detected by the temporary steam pressure detector 15X, but the steam pressure design value may be used. . Moreover, although the case where the steam pressure detector was not provided in the exhaust part of the intermediate pressure turbine 12 was demonstrated, as shown in FIG. 14, the steam pressure detector 15d is provided in the exhaust part of the intermediate pressure turbine 12. However, the efficiency of the high-pressure turbine 11 can be calculated in the same manner even when the steam pressure detector is not provided in the exhaust portion of the high-pressure turbine 11.

  That is, a steam pressure characteristic function is created by detecting the inlet steam pressure of the high pressure turbine 11, the outlet steam pressure of the intermediate pressure turbine 12, and the outlet steam pressure of the low pressure turbine 13, and the detection position to be obtained from the created steam pressure characteristic function is determined. The steam pressure is determined by specifying the number of turbine stages, and the steam pressure is calculated so that the calculated steam pressure matches the steam pressure at the virtual detection point detected by the temporary steam pressure detector 15X or the steam pressure design value. The pressure characteristic function is corrected, and the steam pressure in the exhaust section of the high-pressure turbine 11 in which the steam pressure detector is not installed is calculated using the corrected steam pressure characteristic function. And the metal temperature from the metal temperature detector 17a of the high pressure turbine 11 is acquired, and the efficiency of the high pressure turbine 11 is calculated based on the metal temperature and the calculated steam pressure.

  According to the fourth embodiment, the steam pressure detector 15 or the steam temperature detector 16 is provided at the inlet or outlet of any steam turbine of the steam turbine system including the high pressure turbine 11, the intermediate pressure turbine 12, and the low pressure turbine 13. Even if there is no installation, the efficiency of the steam turbine in the vicinity of the location can be calculated more accurately.

  The method described in each embodiment described above can be created as a program that can be executed by the computer 18. Then, the program can be stored in a storage medium and applied to each device, or transmitted by a communication medium and applied to various devices.

The flowchart which shows the steam turbine pressure calculation method concerning the 1st Embodiment of this invention. 1 is a system configuration diagram of a steam turbine system to which a steam turbine pressure calculation method according to a first embodiment of the present invention is applied. The block block diagram of the computer which arithmetically processes the steam turbine pressure calculation method of this invention. The characteristic view of the characteristic curve by an example of the steam pressure characteristic function P (x) used by this invention. The system configuration | structure figure of another example of the steam turbine system | strain with which the steam turbine pressure calculation method concerning the 1st Embodiment of this invention is applied. The flowchart which shows the steam turbine pressure calculation method concerning the 2nd Embodiment of this invention. The system block diagram of the steam turbine system | strain with which the steam turbine pressure calculation method concerning the 2nd Embodiment of this invention is applied. The system block diagram of another example of the steam turbine system | strain with which the steam turbine pressure calculation method concerning the 2nd Embodiment of this invention is applied. The flowchart which shows the steam turbine efficiency calculation method concerning the 3rd Embodiment of this invention. The system block diagram of the steam turbine system | strain with which the steam turbine efficiency calculation method concerning the 3rd Embodiment of this invention is applied. The system block diagram of another example of the steam turbine system | strain with which the steam turbine efficiency calculation method concerning the 3rd Embodiment of this invention is applied. The flowchart which shows the steam turbine efficiency calculation method concerning the 4th Embodiment of this invention. The system block diagram of the steam turbine system | strain with which the steam turbine efficiency calculation method concerning the 4th Embodiment of this invention is applied. The system configuration | structure figure of another example of the steam turbine system | strain with which the steam turbine efficiency calculation method concerning the 4th Embodiment of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... High pressure turbine, 12 ... Medium pressure turbine, 13 ... Low pressure turbine, 14 ... Reheater, 15 ... Steam pressure detector, 16 ... Steam temperature detector, 17 ... Metal temperature detector, 18 ... Computer

Claims (8)

Inlet steam pressure of the high-pressure turbine of the steam turbine system that guides steam that has finished work in the high-pressure turbine to an intermediate-pressure turbine and that directs steam that has finished work in the intermediate-pressure turbine to a low-pressure turbine, inlet steam pressure of the intermediate-pressure turbine, Detecting any three of the inlet steam pressure of the low-pressure turbine and the outlet steam pressure of the low-pressure turbine;
The detected three steam pressures are substituted into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c}, and the number of turbine stages at the steam pressure detection point position is substituted into x to obtain the steam pressure characteristics. Find the constants a, b, c of the function,
Substituting the obtained values into the constants a, b, and c of the steam pressure characteristic function to create a steam pressure characteristic function,
In the generated steam pressure characteristic function x, the steam pressure not detected among the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine. A steam turbine pressure calculation method, wherein the steam pressure at the virtual detection point position is calculated by substituting the number of turbine paragraphs at the virtual detection point position. Inlet steam pressure of the high-pressure turbine of the steam turbine system that guides steam that has finished work in the high-pressure turbine to an intermediate-pressure turbine and that directs steam that has finished work in the intermediate-pressure turbine to a low-pressure turbine, inlet steam pressure of the intermediate-pressure turbine, Detecting any three of the inlet steam pressure of the low-pressure turbine and the outlet steam pressure of the low-pressure turbine;
The detected three steam pressures are substituted into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c}, and the number of turbine stages at the steam pressure detection point position is substituted into x to obtain the steam pressure characteristics. Find the constants a, b, c of the function,
Substituting the obtained values into the constants a, b, and c of the steam pressure characteristic function to create a steam pressure characteristic function,
In the created steam pressure characteristic function expression x, the steam not detected among the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine Substituting the number of turbine stages at the virtual detection point position of pressure, and calculating the steam pressure at the virtual detection point position for the steam pressure that is not detected,
Correcting the steam pressure characteristic function so that the calculated steam pressure matches the steam pressure or steam pressure design value of the virtual detection point position detected by a temporary steam pressure detector;
A steam turbine pressure calculation method, wherein a steam pressure at a virtual detection point position is calculated using a corrected steam pressure characteristic function. Inlet steam pressure of the high-pressure turbine of the steam turbine system that guides steam that has finished work in the high-pressure turbine to an intermediate-pressure turbine and that directs steam that has finished work in the intermediate-pressure turbine to a low-pressure turbine, inlet steam pressure of the intermediate-pressure turbine, Detecting any three of the inlet steam pressure of the low-pressure turbine and the outlet steam pressure of the low-pressure turbine;
The detected three steam pressures are substituted into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c}, and the number of turbine stages at the steam pressure detection point position is substituted into x to obtain the steam pressure characteristics. Find the constants a, b, c of the function,
Substituting the obtained values into the constants a, b, and c of the steam pressure characteristic function to create a steam pressure characteristic function,
In the generated steam pressure characteristic function x, the steam pressure not detected among the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine. Substituting the number of turbine paragraphs at the virtual detection point position, and calculating the steam pressure at the virtual detection point position for the steam pressure not detected,
A steam turbine efficiency calculation method, comprising: calculating efficiency of a steam turbine near a virtual detection point position based on a metal temperature of the steam turbine near the virtual detection point position and the calculated steam pressure. Inlet steam pressure of the high-pressure turbine of the steam turbine system that guides steam that has finished work in the high-pressure turbine to the intermediate-pressure turbine and that directs steam that has finished work in the intermediate-pressure turbine to the low-pressure turbine, inlet steam pressure of the intermediate-pressure turbine, Detecting any three of the inlet steam pressure of the low-pressure turbine and the outlet steam pressure of the low-pressure turbine;
The detected three steam pressures are substituted into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c}, and the number of turbine stages at the steam pressure detection point position is substituted into x to obtain the steam pressure characteristics. Find the constants a, b, c of the function,
Substituting the obtained values into the constants a, b, and c of the steam pressure characteristic function to create a steam pressure characteristic function,
In the generated steam pressure characteristic function x, the steam pressure not detected among the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine. Substituting the number of turbine paragraphs at the virtual detection point position, and calculating the steam pressure at the virtual detection point position for the steam pressure not detected,
Correcting the steam pressure characteristic function so that the calculated steam pressure matches the steam pressure or steam pressure design value of the virtual detection point position detected by a temporary steam pressure detector;
Using the corrected steam pressure characteristic function, calculate the steam pressure at the virtual detection point position for the undetected steam pressure,
A steam turbine efficiency calculation method, comprising: calculating efficiency of a steam turbine near a virtual detection point position based on a metal temperature of the steam turbine near the virtual detection point position and the calculated steam pressure. A computer for calculating the steam pressure of the steam turbine system that directs the steam that has finished work in the high-pressure turbine to the medium-pressure turbine and directs the steam that has finished work in the medium-pressure turbine to the low-pressure turbine;
Means for inputting any three of the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine;
Substituting the three input steam pressures into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the turbine stage number at the steam pressure detection point position into x, the steam pressure characteristics Means for determining constants a, b, c of the function;
Means for creating a steam pressure characteristic function by substituting the obtained values into a, b, and c of the steam pressure characteristic function, and x of the created steam pressure characteristic function, the inlet steam pressure of the high pressure turbine, the intermediate pressure turbine Of the steam pressure at the virtual detection point position of the steam pressure that was not input among the inlet steam pressure of the low pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine. Means for calculating the vapor pressure at the detection point position;
Steam turbine pressure calculation program to function as A computer for calculating the steam pressure of the steam turbine system that directs the steam that has finished work in the high-pressure turbine to the medium-pressure turbine and directs the steam that has finished work in the medium-pressure turbine to the low-pressure turbine;
Means for inputting any three of the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine;
Substituting the three input steam pressures into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the turbine stage number at the steam pressure detection point position into x, the steam pressure characteristics Means for determining constants a, b, c of the function;
Means for creating a steam pressure characteristic function by substituting the obtained values into a, b and c of the steam pressure characteristic function;
And the steam pressure characteristic function x that has been created, the steam not input from the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine Means for substituting the number of turbine stages at the virtual detection point position of pressure and calculating the steam pressure at the virtual detection point position for the steam pressure not input;
Means for inputting steam pressure at the virtual detection point position detected by a temporary steam pressure detector, and steam pressure or steam pressure design at the virtual detection point position where the calculated steam pressure is detected by a temporary steam pressure detector Means for correcting the steam pressure characteristic function so as to match the value, and means for calculating the steam pressure at the virtual detection point position using the corrected steam pressure characteristic function;
Steam turbine pressure calculation program to function as A computer for calculating the efficiency of the steam turbine in the steam turbine system that directs the steam that has finished work in the high-pressure turbine to the medium-pressure turbine and directs the steam that has finished work in the medium-pressure turbine to the low-pressure turbine;
Means for inputting any three of the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine;
Substituting the three input steam pressures into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the turbine stage number at the steam pressure detection point position into x, the steam pressure characteristics Means for determining constants a, b, c of the function;
Means for creating a steam pressure characteristic function by substituting the obtained values into a, b and c of the steam pressure characteristic function;
The steam pressure that was not inputted among x of the created steam pressure characteristic function among the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine Substituting the number of turbine stages at the virtual detection point position and calculating the steam pressure at the virtual detection point position for the steam pressure that was not input, and the metal temperature of the steam turbine near the virtual detection point position and the calculated steam Means for calculating the efficiency of the steam turbine near the virtual detection point position based on the pressure;
Steam turbine efficiency calculation program to function as A computer for calculating the efficiency of the steam turbine in the steam turbine system that directs the steam that has finished work in the high-pressure turbine to the medium-pressure turbine and directs the steam that has finished work in the medium-pressure turbine to the low-pressure turbine;
Means for inputting any three of the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine;
Substituting the three input steam pressures into P (x) of the steam pressure characteristic function {P (x) = a × b ^x + c} and substituting the turbine stage number at the steam pressure detection point position into x, the steam pressure characteristics Means for determining constants a, b, c of the function;
Means for creating a steam pressure characteristic function by substituting the obtained values into a, b and c of the steam pressure characteristic function;
The steam pressure that was not inputted among x of the created steam pressure characteristic function among the inlet steam pressure of the high pressure turbine, the inlet steam pressure of the intermediate pressure turbine, the inlet steam pressure of the low pressure turbine, and the outlet steam pressure of the low pressure turbine Means for substituting the number of turbine stages at the virtual detection point position and calculating the steam pressure at the virtual detection point position for the steam pressure not input,
Means for inputting steam pressure at the virtual detection point position detected by a temporary steam pressure detector, and steam pressure or steam pressure design at the virtual detection point position where the calculated steam pressure is detected by a temporary steam pressure detector Means for correcting the steam pressure characteristic function to match the value,
Means for calculating the steam pressure at the virtual detection point position using the corrected steam pressure characteristic function, and the steam pressure calculated using the metal temperature of the steam turbine near the virtual detection point position and the corrected steam pressure characteristic function. A means for calculating the efficiency of the steam turbine near the virtual detection point position,
Steam turbine efficiency calculation program to function as

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