Steam-gas combined cycle generator set power plant monitoring system for performing multi-term evaluation display

Abstract

The invention relates to the technical field of power plant monitoring, in particular to a steam-gas combined cycle generator set power plant monitoring system for multi-term evaluation display. The system comprises an analysis and comparison unit, a judgment control unit and an evaluation display unit. A judgment control unit receives unstable data in an analysis and comparison unit and obtains gas turbine equipment parameter data, waste heat boiler equipment parameter data, steam turbine equipment parameter data, generator equipment parameter data and auxiliary system equipment parameter data from the analysis and comparison unit; the monitoring unit is used for monitoring the steam-gas combined cycle generator set equipment, judging the stability of the steam-gas combined cycle generator set equipment by using an artificial intelligence algorithm, transmitting the data to the evaluation display unit according to an established evaluation rule, and transmitting unstable equipment data to the detection alarm unit; therefore, the reliability of the steam-gas combined cycle generator set is improved, and safe operation of equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of power plant monitoring panel, and in particular to a power plant monitoring panel system for a steam-gas combined cycle generator set capable of performing multiple evaluation displays. Background Art

[0002] In the steam-gas combined cycle generator set, natural gas enters the gas turbine and burns to generate chemical energy, which is then converted into mechanical energy. The mechanical energy is then used to drive the gas turbine to rotate, and the gas turbine drives the generator to generate electricity. Since the exhaust temperature of the gas turbine is very high, the waste heat boiler is heated, and the waste heat boiler generates steam, which is used to drive the steam turbine, and the steam turbine continues to drive the generator to generate electricity. Therefore, by monitoring the operating status of the steam-gas combined cycle generator set in the power plant, it is found that the ambient temperature data will have an unstable effect on the performance of the gas turbine during the operation of the gas turbine in the steam-gas combined cycle generator set, and the monitoring status data is used to find that the ambient temperature data will have an unstable effect on the performance of the gas turbine, causing the generator speed to fluctuate, resulting in a decrease in the generator's power generation efficiency, and at the same time causing a decrease in the overall operating efficiency of the steam-gas combined cycle generator set. Therefore, we provide a steam-gas combined cycle generator set power plant monitoring system that performs multiple evaluation displays. Summary of the invention

[0003] The object of the present invention is to provide a steam-gas combined cycle power generation unit power plant monitoring system that performs multiple evaluation displays to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides a steam-gas combined cycle power plant monitoring system for performing multiple evaluation and display, comprising an analysis and comparison unit, a judgment and control unit, and an evaluation and display unit;

[0005] The analysis and comparison unit is used to monitor the operating status of the steam-gas combined cycle generator set in the power plant, obtain historical data, and analyze the influence of temperature difference based on the monitored operating status data, and then compare the analyzed influence temperature data with the set standard influence difference temperature range value, and judge whether the gas engine has unstable performance according to the comparison result;

[0006] The judgment control unit is used to receive the command data of the combustion engine not having unstable performance in the analysis and comparison unit, and the judgment control unit takes data from the analysis and comparison unit and calculates the main steam flow rate in the steam turbine, and then uses the calculated main steam flow rate value data and the set main steam flow rate value data to judge the unstable situation of the steam turbine output frequency, and performs control and adjustment according to the judgment result;

[0007] The evaluation and display unit is used to judge the command data in the control unit. The evaluation and display unit takes data from the analysis and comparison unit and performs effect evaluation, and then displays the evaluated effect data.

[0008] As a further improvement of the technical solution, the analysis and comparison unit includes an acquisition analysis module and a data comparison module;

[0009] The acquisition and analysis module is used to monitor the operating status of the steam-gas combined cycle generator set in the power plant and obtain historical data, then obtain the ambient temperature data and the exhaust temperature data of the gas turbine around the steam-gas combined cycle generator set from the operating status data of the monitoring panel, and then analyze the ambient temperature trend of the ambient temperature data;

[0010] The steam-gas combined cycle power generation unit includes main equipment and auxiliary equipment;

[0011] The main equipment includes gas turbines, waste heat boilers, steam turbines, and generators;

[0012] Auxiliary equipment includes natural gas pressure regulating station, air compressor, high and medium pressure water pump, circulating water pump, condensate pump;

[0013] The historical data includes two different pressures in the steam turbine pipeline, main steam temperature, steam turbine pipeline radius, sealing performance, historical steam utilization efficiency in the steam turbine, gas turbine equipment parameter data, waste heat boiler equipment parameter data, and generator equipment parameter data;

[0014] The data comparison module is used to receive the engine exhaust temperature data, the analyzed ambient temperature trend data and the ambient temperature data in the acquisition analysis module, and use the correlation analysis technology to analyze the temperature difference impact on the engine exhaust temperature data according to the analyzed ambient temperature trend data, and then use the analyzed impact temperature data to compare with the set standard impact difference temperature range value.

[0015] As a further improvement of the technical solution, the specific comparison conditions in the data comparison module include:

[0016] Case ①: When the analyzed impact temperature data exceeds the set standard impact difference temperature range value, it means that the ambient temperature has a temperature difference with the exhaust temperature of the gas turbine, and the gas turbine has unstable performance. The environmental data of the steam-gas combined cycle generator set is adjusted to the set standard combustion temperature range value and stopped;

[0017] Case ②: When the analyzed impact temperature data is within the set standard impact difference temperature range, it indicates that the engine does not have unstable performance, and the engine does not have unstable performance command data is transmitted to the judgment control unit.

[0018] As a further improvement of the technical solution, the judgment control unit includes a calculation judgment module and a control adjustment module;

[0019] The calculation and judgment module is used to receive the data comparison module indicating that the combustion engine does not have unstable performance command data, and the calculation and judgment module obtains the main steam temperature data, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline from the acquisition and analysis module, and calculates the main steam flow in the steam turbine according to the main steam temperature, the two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline by using the flow algorithm, and then uses the calculated main steam flow value data and the set main steam flow value data to judge the unstable situation of the steam turbine output frequency;

[0020] The control and regulation module is used to receive the command data indicating that the steam turbine output frequency is unstable in the calculation and judgment module. The control and regulation module obtains the calculated main steam flow value data and the set main steam flow value data from the calculation and judgment module, and uses the steam flow absolute difference algorithm to calculate the absolute difference of the main steam flow of the steam turbine according to the calculated main steam flow value data and the set main steam flow value data, and then controls and regulates according to the calculated absolute difference of the main steam flow of the steam turbine, adjusts to be consistent with the set main steam flow value data and stops, and transmits the control and regulation command data to the evaluation and display unit.

[0021] As a further improvement of the technical solution, the specific judgment situations in the calculation judgment module include:

[0022] Case 1: When the calculated main steam flow value data is less than the set main steam flow value data, it indicates that the steam turbine output frequency is unstable, and the steam turbine output frequency unstable command data is transmitted to the control and regulation module;

[0023] Case 2: When the calculated main steam flow value data is greater than the set main steam flow value data, it indicates that the steam turbine frequency is unstable, and the unstable command data of the steam turbine output frequency is transmitted to the control and regulation module;

[0024] Case three: when the calculated main steam flow value data is consistent with the set main steam flow value data, it indicates that there is no instability in the steam turbine output frequency, and the steam turbine output frequency no instability command data is transmitted to the evaluation display unit.

[0025] As a further improvement of the present technical solution, the evaluation and display unit is used to receive the command data of the steam turbine output frequency not being unstable in the calculation and judgment module or the command data of the control and regulation in the control and regulation module. The evaluation and display unit takes the sealing performance, the operating status of the monitoring panel, and the historical steam utilization efficiency data of the steam turbine into the acquisition and analysis module, and performs effect evaluation based on the sealing performance, the operating status of the monitoring panel, and the historical steam utilization efficiency data of the steam turbine. The evaluation effect is divided into low effect and good effect, and then the evaluation effect data is displayed.

[0026] As a further improvement of the technical solution, the implementation steps of calculating the main steam flow rate using the flow algorithm in the calculation and judgment module are as follows:

[0027] Step ①, firstly obtain the main steam temperature data, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline, the two different pressure data in the steam turbine pipeline include the main steam pressure data and the reheat steam pressure data;

[0028] Step ②: Reuse the main steam pressure data DY yl With reheat steam pressure data DE yl Subtract and get the absolute pressure difference YL c =|DY yl -DE yl |, and then use the steam turbine pipe radius GD r The square of the value is multiplied by π to obtain the area of ​​the steam flow cross section in the steam turbine.

[0029] Step ③, according to the main steam temperature data YX rqwd , absolute pressure difference YL c , the cross-sectional area A is used to calculate the main steam flow rate in the steam turbine, and the calculated main steam flow value data JS is obtained ll , the specific algorithm formula is:

[0030]

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. In the monitoring system of the steam-gas combined cycle power plant unit that has been evaluated and demonstrated, the data comparison module is used to receive the exhaust temperature data of the gas turbine in the analysis module, the analyzed ambient temperature trend data and the ambient temperature data, and use the correlation analysis technology to analyze the influence of temperature difference on the exhaust temperature data of the gas turbine according to the analyzed ambient temperature trend data, and then use the analyzed influence temperature data to compare with the set standard influence difference temperature range value, and judge whether the gas turbine has unstable performance according to the comparison result. By analyzing the temperature data, abnormal temperature problems can be identified, and more accurate maintenance decision support can be provided, which is convenient for optimizing the performance of the gas turbine and improving the overall operating efficiency.

[0033] 2. In the power plant monitoring system of the steam-gas combined cycle generator set that has been subjected to multiple evaluations and demonstrations, the calculation and judgment module is used to receive the data of the unstable performance command of the gas turbine in the data comparison module. The calculation and judgment module obtains the main steam temperature data, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline from the acquisition and analysis module, and uses the flow algorithm to calculate the main steam flow in the steam turbine according to the main steam temperature, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline. The calculated main steam flow value data and the set main steam flow value data are then used to judge the instability of the steam turbine output frequency. By judging the instability of the steam turbine output frequency and adjusting the main steam flow in the steam turbine in time, the stability of the output frequency can be maintained, and the overall reliability of the steam-gas combined cycle generator set can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is an overall block diagram of the present invention;

[0035] Figure 2 It is a block diagram of the analysis and comparison unit of the present invention;

[0036] Figure 3 It is a block diagram of the judgment control unit of the present invention.

[0037] The meaning of each number in the figure is:

[0038] 1. Analysis and comparison unit; 11. Acquisition and analysis module; 12. Data comparison module;

[0039] 2. Judgment control unit; 21. Calculation and judgment module; 22. Control and adjustment module; 3. Evaluation and display unit. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] The present invention provides a steam-gas combined cycle power plant monitoring system for multiple evaluation displays. Figure 1-Figure 3 , including an analysis and comparison unit 1, a judgment and control unit 2, and an evaluation and display unit 3;

[0043] The analysis and comparison unit 1 is used to monitor the operating status of the steam-gas combined cycle generator set in the power plant, obtain historical data, and analyze the influence of temperature difference based on the monitored operating status data, and then compare the analyzed influence temperature data with the set standard influence difference temperature range value, and judge whether the gas engine has performance instability according to the comparison result; the judgment control unit 2 is used to receive the command data of the gas engine not having performance instability in the analysis and comparison unit 1, and the judgment control unit 2 takes data from the analysis and comparison unit 1 and calculates the main steam flow in the steam turbine, and then uses the calculated main steam flow value data and the set main steam flow value data to judge the instability of the steam turbine output frequency, and controls and adjusts according to the judgment result; the evaluation and display unit 3 is used to judge the command data in the control unit 2, and the evaluation and display unit 3 takes data from the analysis and comparison unit 1 and evaluates the effect, and then displays the evaluated effect data.

[0044] The following is a refinement of the above units, see Figure 1-Figure 3 ;

[0045] The analysis and comparison unit 1 includes an acquisition and analysis module 11 and a data comparison module 12;

[0046] The acquisition and analysis module 11 is used to monitor the operating status of the steam-gas combined cycle generator set in the power plant and obtain historical data, and then obtain the ambient temperature data and the exhaust temperature data of the gas turbine around the steam-gas combined cycle generator set from the operating status data of the monitoring panel, and then analyze the ambient temperature trend of the ambient temperature data;

[0047] The steam-gas combined cycle power generation unit includes main equipment and auxiliary equipment;

[0048] The main equipment includes gas turbines, waste heat boilers, steam turbines, and generators;

[0049] Auxiliary equipment includes natural gas pressure regulating station, air compressor, high and medium pressure water pump, circulating water pump, condensate pump;

[0050] The natural gas pressure regulating station usually monitors and controls the natural gas inlet pressure, natural gas inlet flow rate and natural gas inlet temperature parameters;

[0051] The main function of the air compressor is to compress the air into a high-pressure state and obtain the compressed air pressure parameters;

[0052] High and medium pressure feed water pumps usually monitor the feed water flow and pressure;

[0053] The circulating water pump is a kind of equipment used for circulating water delivery;

[0054] Condensate pump refers to a pump device used to collect and discharge condensate produced in boilers and steam generators;

[0055] The historical data includes two different pressures in the steam turbine pipeline, main steam temperature, steam turbine pipeline radius, sealing performance, historical steam utilization efficiency in the steam turbine, gas turbine equipment parameter data, waste heat boiler equipment parameter data, and generator equipment parameter data;

[0056] The data comparison module 12 is used to receive the engine exhaust temperature data, the analyzed ambient temperature trend data and the ambient temperature data in the acquisition analysis module 11, and use the correlation analysis technology to analyze the temperature difference impact on the engine exhaust temperature data according to the analyzed ambient temperature trend data, and then use the analyzed impact temperature data to compare with the set standard impact difference temperature range value;

[0057] The specific comparison situations in the data comparison module 12 include:

[0058] Case ①: When the analyzed impact temperature data exceeds the set standard impact difference temperature range value, it means that the ambient temperature has a temperature difference with the exhaust temperature of the gas turbine, and the gas turbine has unstable performance. The environmental data of the steam-gas combined cycle generator set is adjusted to the set standard combustion temperature range value and stopped;

[0059] Case ②: When the analyzed impact temperature data is within the set standard impact difference temperature range, it indicates that the engine does not have unstable performance, and the engine does not have unstable performance command data is transmitted to the judgment control unit 2.

[0060] The judgment control unit 2 includes a calculation judgment module 21 and a control adjustment module 22;

[0061] The calculation and judgment module 21 is used to receive the data comparison module 12 indicating that the combustion engine does not have unstable performance command data. The calculation and judgment module 21 obtains the main steam temperature data, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline from the acquisition and analysis module 11, and uses the flow algorithm to calculate the main steam flow in the steam turbine according to the main steam temperature, the two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline, and then uses the calculated main steam flow value data and the set main steam flow value data to judge the unstable situation of the steam turbine output frequency. By real-time monitoring of the steam flow, the operating parameters can be adjusted in time to ensure that the steam turbine operates under the best working conditions, thereby improving the energy conversion efficiency;

[0062] The steps for calculating the main steam flow rate using the flow rate algorithm in the calculation and judgment module 21 are as follows:

[0063] Step ①, firstly obtain the main steam temperature data, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline, the two different pressure data in the steam turbine pipeline include the main steam pressure data and the reheat steam pressure data;

[0064] Step ②: Reuse the main steam pressure data DY yl With reheat steam pressure data DE yl Subtract and get the absolute pressure difference YL c =|DY yl -DE yl |, and then use the steam turbine pipe radius GD r The square of the value is multiplied by π to obtain the area of ​​the steam flow cross section in the steam turbine.

[0065] Step ③, according to the main steam temperature data YX rqwd , absolute pressure difference YL c , the cross-sectional area A is used to calculate the main steam flow rate in the steam turbine, and the calculated main steam flow value data JS is obtained ll , the specific algorithm formula is:

[0066]

[0067] This formula is used to calculate the main steam flow in the steam turbine. By calculating the main steam flow in the steam turbine, its changing trend can be monitored. When it is found that the main steam flow in the steam turbine fluctuates violently in a short period of time, it will affect the overall stability of the steam-gas combined cycle generator set, and timely measures should be taken to adjust the steam turbine equipment parameter data to ensure that the output frequency of the steam turbine remains stable and avoid adverse effects on the steam-gas combined cycle generator set;

[0068] The specific judgment situations in the calculation judgment module 21 include:

[0069] Case 1: when the calculated main steam flow value data is less than the set main steam flow value data, it indicates that the steam turbine output frequency is unstable, and the steam turbine output frequency unstable command data is transmitted to the control and regulation module 22;

[0070] Case 2: When the calculated main steam flow value data is greater than the set main steam flow value data, it indicates that the steam turbine frequency is unstable, and the steam turbine output frequency is unstable command data is transmitted to the control and regulation module 22;

[0071] Case 3: When the calculated main steam flow value data is consistent with the set main steam flow value data, it indicates that the steam turbine output frequency is not unstable, and the steam turbine output frequency is not unstable command data is transmitted to the evaluation display unit 3;

[0072] The control and regulation module 22 is used to receive the command data indicating that the steam turbine output frequency is unstable in the calculation and judgment module 21. The control and regulation module 22 obtains the calculated main steam flow value data and the set main steam flow value data from the calculation and judgment module 21, and uses the steam flow absolute difference algorithm to calculate the absolute difference of the main steam flow of the steam turbine according to the calculated main steam flow value data and the set main steam flow value data, and then controls and regulates according to the calculated absolute difference of the main steam flow of the steam turbine, adjusts to be consistent with the set main steam flow value data and stops, and transmits the control and regulation command data to the evaluation and display unit 3;

[0073] The implementation principle of calculating the absolute difference of steam flow using the absolute difference algorithm of steam flow:

[0074] First collect the calculated main steam flow value data JS ll And the set main steam flow value data BZ ll , and use the calculated main steam flow value data JS ll And the set main steam flow value data BZ ll The absolute value of the steam turbine main steam flow is subtracted and the absolute difference data JD is obtained. cz , the specific algorithm formula is:

[0075] JD cz =|JS ll _BZ ll |;

[0076] This formula is used to calculate the absolute difference of the main steam flow of the steam turbine. By calculating the absolute difference, the effect of steam flow regulation control can be evaluated more accurately to improve the overall response speed and control accuracy of the steam-gas combined cycle generator set, thereby more effectively achieving stable control of the steam flow.

[0077] The evaluation and display unit 3 is used to receive the command data of the steam turbine output frequency not being unstable in the calculation and judgment module 21 or the command data of the control and regulation in the control and regulation module 22. The evaluation and display unit 3 obtains the sealing performance, the operating status of the monitoring panel, and the historical steam utilization efficiency data in the steam turbine from the acquisition and analysis module 11, and evaluates the effect based on the sealing performance, the operating status of the monitoring panel, and the historical steam utilization efficiency data in the steam turbine. The evaluation effect is divided into low effect and good effect, and then the evaluation effect data is displayed.

[0078] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A steam-gas combined cycle power plant monitoring system for multiple evaluation displays, characterized in that: It comprises an analysis and comparison unit (1), a judgment and control unit (2), and an evaluation and display unit (3); The analysis and comparison unit (1) is used to monitor the operating status of the steam-gas combined cycle generator set in the power plant, obtain historical data, and analyze the influence of temperature difference based on the monitored operating status data, and then compare the analyzed influence temperature data with the set standard influence difference temperature range value, and judge whether the gas engine has performance instability based on the comparison result; The judgment control unit (2) is used to receive the command data indicating that the combustion engine does not have unstable performance in the analysis and comparison unit (1), the judgment control unit (2) takes data from the analysis and comparison unit (1) and calculates the main steam flow rate in the steam turbine, and then uses the calculated main steam flow rate value data and the set main steam flow rate value data to judge the unstable output frequency of the steam turbine, and performs control and adjustment according to the judgment result; The evaluation and display unit (3) is used to judge the command data in the control unit (2). The evaluation and display unit (3) takes data from the analysis and comparison unit (1) and performs effect evaluation, and then displays the evaluated effect data.

2. The steam-gas combined cycle power plant monitoring system for performing multiple evaluation displays according to claim 1 is characterized in that: The analysis and comparison unit (1) comprises an acquisition and analysis module (11) and a data comparison module (12); The acquisition and analysis module (11) is used to monitor the operating status of the steam-gas combined cycle generator set in the power plant and obtain historical data, then obtain the ambient temperature data and the exhaust temperature data of the gas turbine around the steam-gas combined cycle generator set from the monitored operating status data, and then analyze the ambient temperature trend of the ambient temperature data; The steam-gas combined cycle power generation unit includes main equipment and auxiliary equipment; The main equipment includes gas turbines, waste heat boilers, steam turbines, and generators; Auxiliary equipment includes natural gas pressure regulating station, air compressor, high and medium pressure water pump, circulating water pump, condensate pump; The historical data includes two different pressures in the steam turbine pipeline, main steam temperature, steam turbine pipeline radius, sealing performance, historical steam utilization efficiency in the steam turbine, gas turbine equipment parameter data, waste heat boiler equipment parameter data, and generator equipment parameter data; The data comparison module (12) is used to receive the combustion engine exhaust temperature data, the analyzed ambient temperature trend data and the ambient temperature data in the acquisition analysis module (11), and to analyze the influence of temperature difference on the combustion engine exhaust temperature data according to the analyzed ambient temperature trend data using correlation analysis technology, and then to compare the analyzed influence temperature data with a set standard influence difference temperature range value.

3. The steam-gas combined cycle power plant monitoring system for performing multiple evaluation displays according to claim 2 is characterized in that: The specific comparison conditions in the data comparison module (12) include: Case ①: When the analyzed impact temperature data exceeds the set standard impact difference temperature range value, it means that the ambient temperature has a temperature difference with the exhaust temperature of the gas turbine, and the gas turbine has unstable performance. The environmental data of the steam-gas combined cycle generator set is adjusted to the set standard combustion temperature range value and stopped; Case ②: When the analyzed impact temperature data is within the set standard impact difference temperature range, it indicates that the engine does not have unstable performance, and the engine does not have unstable performance command data is transmitted to the judgment control unit (2).

4. The steam-gas combined cycle power plant monitoring system for performing multiple evaluation displays according to claim 2 is characterized in that: The judgment control unit (2) comprises a calculation judgment module (21) and a control adjustment module (22); The calculation and judgment module (21) is used to receive the data indicating that the combustion engine does not have unstable performance command data in the data comparison module (12), and the calculation and judgment module (21) obtains the main steam temperature data, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline from the acquisition and analysis module (11), and uses the flow algorithm to calculate the main steam flow in the steam turbine according to the main steam temperature, the two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline, and then uses the calculated main steam flow value data and the set main steam flow value data to judge the unstable situation of the steam turbine output frequency; The control and regulation module (22) is used to receive the command data indicating that the steam turbine output frequency is unstable in the calculation and judgment module (21). The control and regulation module (22) obtains the calculated main steam flow value data and the set main steam flow value data from the calculation and judgment module (21), and uses the steam flow absolute difference algorithm to calculate the absolute difference of the main steam flow of the steam turbine based on the calculated main steam flow value data and the set main steam flow value data, and then controls and regulates the calculated main steam flow according to the absolute difference of the main steam flow of the steam turbine, adjusts the flow until it is consistent with the set main steam flow value data and stops, and transmits the control and regulation command data to the evaluation and display unit (3).

5. The steam-gas combined cycle power plant monitoring system for performing multiple evaluation displays according to claim 4 is characterized in that: The specific judgment situations in the calculation judgment module (21) include: Case 1: when the calculated main steam flow value data is less than the set main steam flow value data, it indicates that the steam turbine output frequency is unstable, and the steam turbine output frequency is unstable command data is transmitted to the control and regulation module (22); Case 2: When the calculated main steam flow value data is greater than the set main steam flow value data, it indicates that the steam turbine frequency is unstable, and the steam turbine output frequency is unstable command data is transmitted to the control and regulation module (22); Case 3: When the calculated main steam flow value data is consistent with the set main steam flow value data, it indicates that there is no instability in the steam turbine output frequency, and the steam turbine output frequency no instability command data is transmitted to the evaluation display unit (3).

6. The steam-gas combined cycle power plant monitoring system for performing multiple evaluation displays according to claim 4 is characterized in that: The evaluation and display unit (3) is used to receive the command data indicating that the steam turbine output frequency does not exist instability in the calculation and judgment module (21) or the command data of the control and regulation in the control and regulation module (22). The evaluation and display unit (3) obtains the sealing performance, the operating status of the monitoring panel, and the historical steam utilization efficiency data in the steam turbine from the acquisition and analysis module (11), and performs effect evaluation based on the sealing performance, the operating status of the monitoring panel, and the historical steam utilization efficiency data in the steam turbine. The evaluation effect is divided into low effect and good effect, and the evaluation effect data is then displayed.

7. The steam-gas combined cycle power plant monitoring system for performing multiple evaluation displays according to claim 4 is characterized in that: The calculation and judgment module (21) includes the following steps for calculating the main steam flow rate using a flow rate algorithm: Step ①, firstly obtain the main steam temperature data, two different pressure data in the steam turbine pipeline, and the radius of the steam turbine pipeline, the two different pressure data in the steam turbine pipeline include the main steam pressure data and the reheat steam pressure data; Step ②: Reuse the main steam pressure data DY yl With reheat steam pressure data DE yl Subtract and get the absolute pressure difference YL c =|DY yl -DE yl |, and then use the steam turbine pipe radius GD r The square of the value is multiplied by π to obtain the area of ​​the steam flow cross section in the steam turbine. Step ③, according to the main steam temperature data YX rqwd , absolute pressure difference YL c , the cross-sectional area A is used to calculate the main steam flow rate in the steam turbine, and the calculated main steam flow value data JS is obtained ll , the specific algorithm formula is:

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