JP2677715B2 - Power plant performance diagnostic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plant performance diagnosing device for diagnosing the performance of a power plant.

[0002]

2. Description of the Related Art Conventionally, in power plant performance diagnosis, for example, a unit efficiency during operation is calculated, and the calculation result is compared with a reference efficiency at the time of plant design to determine deterioration factor of the power plant related measurement data. It was carried out by investigating the condition of. Or turbine, feed water heater,
The efficiency of typical equipment such as boilers and air preheaters (gas air heaters) is calculated, and the results of this calculation are compared with the respective standard efficiencies to investigate the condition of plant constituent equipment that affects the deterioration of unit efficiency. The power plant performance diagnosis was carried out.

[0003]

However, in order to investigate the cause of deterioration of the unit efficiency, there are the following problems.

That is, in order to investigate the cause of the deterioration of the unit efficiency, it is necessary to make an effort to investigate the state of all measurement data used for calculating the unit efficiency. In particular, there has been a problem that a great deal of labor is required to investigate the deterioration factor from the measurement data of several tens of points. Further, when a plurality of measurement data are abnormal at the same time and the unit efficiency is deteriorated, it is not easy to identify the factor. Furthermore, it is difficult to find out the true deterioration factor only from the state of the representative plant constituent auxiliary equipment, because it is difficult to obtain information data.

Therefore, an object of the present invention is to provide a power plant performance diagnosing device capable of easily identifying a factor of fluctuation in unit efficiency fluctuation.

[Configuration of the Invention]

According to the present invention, there is provided a measurement data file for inputting and storing measurement data, and a unit for calculating a unit efficiency of a power plant and a unit efficiency correction term of a power plant device based on the measurement data. Efficiency calculation means, an efficiency calculation result file that stores the calculated values of the calculated unit efficiency and the unit efficiency correction term, and unit efficiency reference value data that stores the unit efficiency and the reference value of the unit efficiency correction term of the power plant equipment A file, a measurement / performance data reference value file that stores reference values such as measurement data and performance data around the power plant equipment, and unit efficiency and unit efficiency correction term calculation values calculated by the unit efficiency calculation means. Unit efficiency and unit efficiency stored in the unit efficiency reference value data file. A unit efficiency deterioration factor determination means for determining which device has a unit efficiency variation deterioration factor by comparing with the reference value of the efficiency correction term, an efficiency deterioration determination result file storing the determination result, and a unit efficiency variation deterioration The measurement data and performance data value of the equipment determined to have the factor are compared with the corresponding measurement data and the reference value of the performance data in the measurement / performance data reference value file, and which of the factors causing deterioration in unit efficiency fluctuation is Measurement / performance data variation determination means for determining whether or not there is measurement data and performance data, measurement / performance data determination result file for storing the determination result, and unit efficiency based on the measurement data saved in the measurement data file A sensor state determination means for determining whether or not the state of the sensor related to the device determined to have the fluctuation deterioration factor is normal, and this determination result. Set the sensor state judgment result file that stores the data, the display means for displaying each data of each file on the display device, and the reference value saved in the unit efficiency reference value data file and the measurement / performance data reference value file. The display device is provided with an input device that uses a screen display command as a display device, and a display device for displaying which measurement data of which device has the unit efficiency fluctuation deterioration factor by the display device. Is.

[0007]

With the above configuration, when it is found that the unit efficiency fluctuations are deteriorated, in addition to the fluctuation status of each unit efficiency and its correction term, the allowable deviation from the reference value of the measurement / performance data and the surroundings of the equipment It is possible to display an abnormality or the like of the measurement sensor of the above on the display device. Therefore, the unit efficiency variation and the deterioration factor can be easily specified from these displays.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a power plant performance diagnostic apparatus showing an embodiment of the present invention. The power plant performance diagnostic device 1 is connected to the sensors 3 installed in each part of the power plant 2. The power plant performance diagnostic device 1 includes a unit efficiency calculation means 4, a unit efficiency deterioration factor determination means 5, a measurement / performance data variation determination means 6, a sensor state determination means 7, a display means 8, an input means 9, a display device 10 and the following. It is composed of each file.

That is, the power plant performance diagnostic device 1 includes a measurement data file 11a, a unit efficiency reference value data file 11b, and a measurement / performance data reference value file 11.
c, measurement / performance data determination result file 11d, efficiency deterioration determination result file 11e, efficiency calculation result file 11
f and the sensor state determination result file 11g.

Here, the unit efficiency calculation means 4 reads the measurement data from the measurement data file 11a, and calculates the unit efficiency (actual measurement value), the unit efficiency correction term, and the unit efficiency (correction value) from the fuel flow rate, the generator power, etc. Calculate each. These calculation results are the efficiency calculation result file 11
stored in f.

The unit efficiency deterioration factor judging means 5 compares the calculation result of the unit efficiency calculating means 4 with the unit efficiency reference value of the unit efficiency reference value data file 11b to judge the deterioration of the unit efficiency. This judgment result is
It is saved in the efficiency deterioration determination result file 11e.

The measurement / performance data variation judging means 6 compares the measurement / performance data used for performance diagnosis with the reference value of the measurement / performance data reference value file 11c, and is within an allowable range with respect to the reference value. Or not. The determination result is saved in the measurement / performance data determination result file 11d.

The sensor state determining means 7 is used for the power generation plant 2
It is determined whether or not the state of the sensor 3 is normal. This determination result is stored in the sensor state determination result file 11g.

The display means 8 displays on the display device 10 each of the calculation result and the judgment result of the measurement / performance data judgment result file 11d, the efficiency deterioration judgment result file 11e, the efficiency calculation result file 11f, and the sensor state judgment result file 11g. To do.

The input means 9 arbitrarily changes the reference value data of the unit efficiency reference value data file 11b and the reference value data of the measurement / performance data reference value file 11c. Further, the input means 9 includes the unit efficiency reference value data file 11b and the measurement / performance data reference value file 1
The data stored in 1c is displayed by the operator on the display device 1
It is a console for displaying 0.

The display device 10 includes a measurement / performance data reference value file 11c and a measurement / performance data determination result file 1
1d, the efficiency deterioration determination result file 11e, the efficiency calculation result file 11f, and the sensor state determination result file 11g are displayed on the display screen according to the request of the input means 9.

The measurement data file 11a stores the measurement data transmitted from the sensor 3 installed in the power plant 2. In addition, the measurement data file 11a secures an area for storing the measurement data necessary for the unit efficiency calculation a plurality of times performed within a certain fixed period. The oldest measurement data on the measurement data file 11a is erased and rewritten as the measurement data when the unit efficiency calculation is performed after this fixed period.

Unit efficiency reference value data file 11b
The unit efficiency deterioration factor determination means 5 stores reference values for comparison with the performance calculation results of the unit efficiency (actual measurement value), the unit efficiency correction term, and the unit efficiency (correction value).

Measurement / performance data reference value file 11c
Is stored with each reference value for comparison with the measurement data and the performance data calculation result by the measurement / performance data variation judging means 6.

Measurement / performance data determination result file 11d
Stores the determination result of the measurement / performance data variation determination means 6.

The efficiency deterioration judgment result file 11e stores the judgment result of the unit efficiency deterioration factor judging means 5.

The efficiency calculation result file 11f stores the performance calculation result of the unit efficiency calculation means 4. The efficiency calculation result file 11f secures an area for storing the calculation results of the unit efficiency calculation performed a plurality of times within a certain fixed period. The calculation result when the unit efficiency calculation is carried out after this fixed period of time is rewritten as the oldest calculation result on the efficiency calculation result file 11f.

The sensor state determination result file 11g stores the determination result of the sensor state determining means 7. The sensor state determination result file 11g secures an area for storing the determination results of performance diagnosis performed a plurality of times within a certain fixed period. The determination result when the performance diagnosis is performed after this fixed period of time is rewritten as the oldest determination result on the sensor state determination result file 11g.

With the above configuration, the operation of the present embodiment will be described with reference to the processing procedure shown in FIG.

First, the measurement data file 11a stores the measurement data d1 transmitted from the sensor 3 installed in the power plant 2 (101). This measurement data file 11a secures an area in which the measurement data for one month can be stored even if the power plant performance diagnosis is performed twice a day.

Next, the unit efficiency calculation means 4 calculates the unit efficiency (actual measurement value) from the measurement data d2 such as the fuel flow rate and the generator power stored in the measurement data file 11a. At the same time, the unit efficiency correction term is calculated from the measured data around the power plant equipment such as condenser vacuum degree, atmospheric temperature, main steam temperature, etc., and added to the unit efficiency (actual measurement value) to calculate the unit efficiency. Calculate (correction value) (1
02).

The unit efficiency correction term is, for example, a generator power factor, a condenser vacuum degree, an atmospheric temperature, a fuel hydrogen content, a fuel oil inlet fuel temperature, a steam type air preheater steam flow rate, a high temperature hot water heater steam. Flow rate, low-temperature hot water heater steam flow rate, turbine inlet main steam pressure, turbine inlet main steam temperature, reheater outlet steam temperature, reheater steam pressure drop, boiler exhaust gas temperature,
Steam-type air preheater Steam drain condenser Determined based on destination measurement and performance data.

For example, the unit efficiency correction term ΔηPP based on the generator power factor PR is obtained by the following calculation formula.

[0030]

## EQU1 ## ΔηPP = (ηG0−ηG) × (ηT0 / ηG0) × ηB0 × 100

Here, ΔηPP: unit efficiency correction term based on generator power factor [%] ηG: ηG = f (PR) generator efficiency based on power factor PR [%] PR: generator power factor ηG0: boiler efficiency (plan Value) [%] ηT0: Turbine efficiency (planned value) [%] ηB0: Generator efficiency (planned value) [%]

FIG. 3 shows the unit efficiency (actual measurement value), the unit efficiency (correction value), the unit efficiency correction term, and the calculation result d3 of each device generated in the calculation process obtained by the unit efficiency calculation means 4. The data is stored in the efficiency calculation result file 11f having the above structure (103).

Further, the unit efficiency calculation means 4 calculates the standard deviation of each unit from the calculation result d3 of the efficiency calculation result file 11f and the measurement data d2 of the measurement data file 11a as follows, and the result is the efficiency calculation result. Save to file 11f. That is, the efficiency calculation result file 11
The unit efficiency (measured value) for the past one month, each unit efficiency correction term, unit efficiency (correction value), and calculation result d3 are read from f, and the past 1 is read from the measurement data file 11a.
The measurement data d2 for a month is read. Then, the unit efficiency (actual measurement value), each unit efficiency correction term is calculated through a calculation process such as squaring the difference between each of these average values and the measurement data d2 or the calculation result d3, and calculating the square root of the sum of squares. , The standard deviation d03 of the unit efficiency (correction value) with respect to the performance data and the calculation data is calculated. Then, these standard deviations d03 are stored in the efficiency calculation result file 11f.

Here, the structure of the efficiency calculation result file 11f shown in FIG. 3 will be specifically described. The area F1 is an area for storing the first unit efficiency calculation result. Similarly, the area F2 stores the second unit efficiency calculation result, and the area F3 stores the third unit efficiency calculation result, and the same file format is provided with repeated areas thereafter.

Assuming that the unit efficiency calculation is performed twice a day, the area number is set to 62 and the area is secured in the efficiency calculation result file 11f so that the calculation result d3 for one month is stored. The unit efficiency calculation execution date and time are stored at the beginning of each area, and the display unit 8 can display the unit efficiency calculation date and time on the display device 10 by using these data. Calculation result No. 1 and No. The calculation results of the unit efficiency (actual measurement value) and the unit efficiency (correction value) are stored in the portion 2 and the calculation result No. 3-No. The calculation result of each unit efficiency correction term is stored in the 16th part. Also, the calculation result N
o. After 17, the calculation result of the performance data of each device is saved.

Next, in the unit efficiency deterioration factor determining means 5, each of the unit efficiency (actual measurement value) and the unit efficiency (correction value) of the calculation result d3 of the unit efficiency calculating means 4 and the unit efficiency reference value data file 11b are stored. The reference value d4 stored in advance is compared (104).

Here, the permissible range of the difference from the reference value d4 used for determining whether or not the unit efficiency has deteriorated is the unit efficiency (measured value) calculated by the unit efficiency calculation means 4, the unit efficiency ( Correction value) standard deviation d03
Value. In this determination, if the calculation result d3 of the unit efficiency (correction value) is lower than the allowable range compared with the reference value d4, it is determined that the unit efficiency is deteriorated (105). The determination result d5 by the unit efficiency deterioration factor determination means 5
Is saved in the efficiency deterioration determination result file 11e (1
06).

In the following procedure, the unit efficiency deterioration factor judging means 5 calculates the unit efficiency calculation means 4 which stores the calculation result d3 stored in the unit efficiency reference value data file 11b.
Each unit efficiency correction term of is compared with the reference value d4 previously stored in the unit efficiency reference value data file 11b corresponding to each of them (107).

Here, the reference value d4 for determining whether or not there is a change is the value of the standard deviation d03 of the unit efficiency correction term calculated by the unit efficiency calculation means 4. In this case, the calculation result d3 is the reference value d of the unit efficiency correction term.
When the value fluctuates from 4 to the allowable range, it is determined that the unit efficiency correction term is out of the allowable range (108). The judgment result d5 of the unit efficiency deterioration factor judging means 5 is stored in the efficiency deterioration judgment result file 11e (109).

Subsequently, the measurement / performance data variation judging means 6
Then, the reference value d6 stored in the measurement / performance data reference value file 11c is compared with the measurement data d2 and the calculation result d3 calculated by the unit efficiency calculation means 4 stored in the measurement data file 11a (110). .

Here, the reference value d6 used for determining whether or not there is a change is the value of the standard deviation d03 of the measurement / performance data obtained by the unit efficiency calculation means 4. When the measurement data and the performance data are outside the permissible range, that is, outside the reference value d6 in the determination of the performance diagnosis, it is determined that the abnormality is outside the permissible range of the measurement / performance data (111). This determination result d7 by the measurement / performance data variation determination means 6 is saved in the measurement / performance data determination result file 11d (112).

Subsequently, the sensor state judging means 7 reads the measurement data d2 of the measurement data file 11a and judges whether or not the state of the sensor 3, that is, the state of disconnection, deviation of the measuring range, etc. (113). As a result, when a state such as disconnection or deviation from the measurement range occurs, the measurement data d2
Is determined to be abnormal (114). This determination result d8 is saved in the sensor state determination result file 11g (11
5).

Next, the display means 8 sends each data stored in the following files to the display device 10 in response to the screen display request d9 from the input means 9.

That is, these data include the measurement data d2 of the measurement data file 11a and the reference value d of the unit efficiency correction term of the unit efficiency reference value data file 11b.
4. There is a measurement / performance data reference value d6 in the measurement / performance data reference value file 11c. Furthermore, in addition to the above, the performance data of the efficiency calculation result file 11f, the unit efficiency (actual measurement value), the unit efficiency (correction value) and the calculation result d10 of each unit efficiency correction term, the determination result d11 of the sensor state determination result file 11g, There are a determination result d12 of the efficiency deterioration determination result file 11e, a determination result d13 of the measurement / performance data determination result file 11d, and the like.

The input means 9 uses the unit efficiency (actually measured value) and the unit efficiency (correction value) stored in the unit efficiency reference value data file 11b as the reference value d4 of each unit efficiency correction term to be an arbitrary reference value. Change to d15 with setting. Further, the input means 9 changes the reference value d6 of the measurement / performance data stored in the measurement / performance data reference value file 11c to the reference value d16 of an arbitrary numerical value together with the setting, and changes the screen display request d9 to the display means 8. Give to.

The display device 10 displays the unit efficiency correction result as shown in FIG. 4 according to the screen display command d14 of the display means 8 (116).

This unit efficiency correction result display screen example 41
In the unit efficiency numerical value display portion 42 on the left side of, the unit efficiency (actual measurement value) and the unit efficiency (correction value) calculation result d10 stored in the efficiency calculation result file 11f are displayed numerically. Further, in the center and right unit efficiency correction term bar graphs 43, the calculation result d10 of each unit efficiency correction term and the unit efficiency reference value data file 1 stored in the efficiency calculation result file 11f are shown.
Reference value d of each unit efficiency correction term stored in 1b
4 is displayed as a bar graph. In this case, if the determination result d12 of each unit efficiency correction term stored in the efficiency deterioration determination result file 11e is out of the allowable range, it is determined that the display means 8 receiving the determination result d12 is abnormal. The color of the bar graph of the unit efficiency correction term is changed and displayed. For example, in the unit efficiency correction result display screen example 41 of FIG. 4, the unit efficiency correction term bar graph 43 has a power factor
The correction value of the degree of vacuum or the like, that is, the correction value is displayed as a bar graph with an efficiency correction term and a reference correction term, and the main steam temperature is changed in color because the correction term is abnormal. Reference numeral 44 is a fixed display for showing a display example of the unit efficiency correction term bar graph 43.

Next, the display means 8 causes the display device 10 to display the determination result of the unit efficiency correction term as shown in FIG. 5 (117).

This unit efficiency correction term judgment result display screen example 45 shows the calculation result d3 of the unit efficiency calculation means 4, the judgment result d5 of the unit efficiency deterioration factor judgment means 5, the measurement / measurement
This is an example of displaying based on the determination result d7 of the performance data variation determination means 6 and the determination result d8 of the sensor state determination means 7.

In the figure, the unit efficiency numerical value display section 46 on the upper right side displays numerically the unit efficiency (actual measurement value) and the unit efficiency (correction value) calculation result d10 stored in the efficiency calculation result file 11f. ing.

Further, the block flow chart display section 4 on the lower right side
In FIG. 7, the measurement data d2 stored in the measurement data file 11a, the performance data stored in the efficiency calculation result file 11f, and the calculation result d of each unit efficiency correction term are shown.
10, the reference value d6 stored in the measurement / performance data reference value file 11c and the reference value d4 of each unit efficiency correction term stored in the unit efficiency reference value data file 11b are displayed numerically. In addition, the determination result d13 stored in the measurement / performance data determination result file 11d
If the judgment result d12 stored in the efficiency deterioration judgment result file 11e is an abnormality judgment or deterioration judgment, the block of the measurement data d2 or the performance data calculation result d10 of the unit efficiency correction term is displayed by the display means 8.
The color can be changed and displayed.

The power plant equipment on the lower left side in the figure is shown in FIG.
8, the determination result d11 stored in the sensor state determination result file 11g and the determination result d12 stored in the efficiency deterioration determination result file 11e are displayed on the display unit 8.
Is displayed. In this case, when the determination result d11 stored in the sensor state determination result file 11g is abnormal measurement data, the display color of the sensor of the measurement data is changed and displayed by the display unit 8. further,
When the determination result d12 stored in the efficiency deterioration determination result file 11e is an abnormality outside the unit efficiency correction term allowable range, the display means 8 changes the display color of the device associated with the unit efficiency correction term. Is displayed. Note that although 49 is a fixed display showing a display example of the block flow chart display unit 47 and the power plant equipment diagram 48, blocks 47 a, 47 b, 47 c of the block flow chart display unit 47 are shown.
The display of abnormalities outside the reference value permissible range is omitted in the figure.

As described above, according to the present embodiment, when the unit efficiency is deteriorated at the time of performing the power plant performance diagnosis, the sensor state is determined, the unit efficiency is compared with the reference value of the correction term, and the measurement / calculation / performance data is collected. While it can be confirmed by comparing it with each reference value, etc., the factor of deterioration in unit efficiency fluctuation can be clarified.

For example, in the display screen example described with reference to FIG.
It is easy to see how much each unit efficiency correction term differs from each reference value. Also, in the display screen example of FIG.
It is easy to see if there is a sensor error, a measurement data out-of-range error, a performance data out-of-range error, or a unit efficiency correction term out-of-range error. Therefore, when the unit efficiency fluctuates and deteriorates, this power plant performance diagnosis device determines, in which part of the unit efficiency calculation process, or in which part of the power plant equipment, the cause of the efficiency deterioration,
It is possible to easily confirm the presence or absence of abnormality in each sensor of the power plant.

In this embodiment, the turbine overall efficiency and the boiler efficiency are calculated by adding the respective correction terms obtained from the measurement / calculation / performance data of the equipment in the same manner as the unit efficiency. As a result, although the present embodiment estimates the fluctuation factor of the unit efficiency, the means for estimating the deterioration factor is applied in the same procedure as that of the present embodiment when the deterioration of the turbine efficiency and the boiler efficiency is judged. be able to. In addition, when estimating factors such as deterioration of internal efficiency of high-pressure / medium-pressure / low-pressure turbines, deterioration of feed water heater performance, deterioration of exhaust gas air preheater temperature, increase of leak rate, unit efficiency of this embodiment It can be implemented by the same means as the estimation of the deterioration factor.

[0056]

As described above, according to the present invention, it is possible to display whether or not each device of the power plant deviates from the permissible range to the level of the measurement data and the sensor state at the time of power plant performance diagnosis. . Therefore, the factor of performance deterioration of the power plant can be easily estimated.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of a power plant performance diagnosis apparatus showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of main parts of the apparatus.

FIG. 3 is an explanatory diagram showing a configuration of an efficiency calculation result file of the device.

FIG. 4 is an explanatory diagram showing an example of a unit efficiency correction result display screen of the same apparatus.

FIG. 5 is an explanatory view showing an example of a unit efficiency correction term determination result display screen by the same device.

[Explanation of symbols]

 1 Power Plant Performance Diagnosis Device 2 Power Plant 3 Sensor 4 Unit Efficiency Calculation Means 5 Unit Efficiency Deterioration Factor Judgment Unit 6 Measurement / Performance Data Variation Judgment Unit 7 Sensor State Judgment Unit 8 Display Means 9 Input Means 10 Display Device

Claims (1)

(57) [Claims] 1. A measurement data file for inputting and storing measurement data from a sensor, and a unit efficiency of a power plant and a unit efficiency correction term of a power plant device are calculated based on the measurement data stored in the measurement data file. A unit efficiency calculation means for storing, and an efficiency calculation result file for storing the calculated values of the unit efficiency and the unit efficiency correction term calculated by the unit efficiency calculation means,
A unit efficiency reference value data file that stores the reference values of the unit efficiency and the unit efficiency correction term, and a measurement / performance data reference value file that stores the reference values of the measurement data and performance data around the power plant equipment, The unit efficiency and unit efficiency correction term calculation values calculated by the unit efficiency calculation means are compared with the unit efficiency and unit efficiency correction term reference values stored in the unit efficiency reference value data file to deteriorate unit efficiency fluctuation. A unit efficiency deterioration factor determining unit that determines which device has a factor, an efficiency deterioration determination result file that stores the determination result of this unit efficiency deterioration factor determining unit, and a unit efficiency fluctuation factor determining unit. Measurement data of equipment determined to have deterioration factors
Data and performance data values are compared with the corresponding measurement data and performance data reference values in the measurement / performance data reference value file to determine which measurement data and performance data cause the deterioration in unit efficiency. Unit efficiency based on the measurement / performance data variation determination means for determination, the measurement / performance data determination result file that stores the determination result obtained by this measurement / performance data variation determination means, and the measurement data stored in the measurement data file A sensor state determination unit that determines whether or not the state of a sensor related to a device determined to have a fluctuation deterioration factor is normal, a sensor state determination result file that stores the determination result obtained by this sensor state determination unit, and the measurement・ Performance data judgment result file,
Display means for displaying each data of the efficiency deterioration determination result file, the efficiency calculation result file and the sensor state determination result file on a display device, the unit efficiency reference value data file and the measurement / performance data reference value file In order to display the input value that sets the reference value stored in the display device and the display command of the screen on the display device as the display means, and which measurement data of which device has the unit efficiency deterioration factor is displayed by the display means. A power plant performance diagnostic device, comprising: