Method and system for acquiring cold and hot start times of steam turbine and program product

Abstract

The invention belongs to a data acquisition method, aims to solve the technical problems of high production cost, low data utilization rate, high human input and easy misjudgment of the existing steam turbine cold and hot start frequency acquisition method, and provides a steam turbine cold and hot start frequency acquisition method and system and a program product, which are used for acquiring data on a DCS (Distributed Control System) side of a power plant in real time to obtain real-time data. Storing the real-time data into a database; according to preset measuring points, effective condition judgment is conducted on the real-time data, and all starting and stopping states of the steam turbine on the current day are obtained; and according to a preset time interval, performing statistics on the start-stop states according to days, months and years, storing statistical results into a database, and sending the statistical results to the outside through an interface. The method can solve the problems of a method for manually judging and counting the cold and hot start times of the steam turbine, improves the data reliability, avoids the complicated data statistics work, improves the working efficiency, and provides data support for the safe, reliable and economical operation of a unit.

Description

Technical Field

[0001] The present application relates to a data acquisition method, and specifically to a method, system and program product for acquiring the number of cold and hot starts of a steam turbine. Background Art

[0002] As one of the most important basic equipment in thermal power plants, steam turbines are likely to cause serious safety hazards if problems occur. In addition, the maintenance and downtime costs of steam turbines are also huge. Therefore, it is particularly important to monitor the status of steam turbines.

[0003] The number of cold and hot starts of steam turbines is an important data for steam turbine detection, providing data support for steam turbine life prediction and fault diagnosis.

[0004] At present, the method used by thermal power generation companies to obtain the number of cold and hot starts of steam turbines is relatively complicated. On-site statistics are mainly reported by manual comparison and recording. The data is not easy to store in the database, so it is difficult to develop and mine the data. At the same time, most DCS systems (Distributed Control System) have almost no corresponding functions, or require a large number of sensor equipment, which increases the production costs of power plants.

[0005] In summary, the above acquisition method has the following main defects: 1. It requires a lot of manpower, which restricts productivity; 2. Manual judgment of the effective status of the fan is required, which is prone to misjudgment; 3. Low data utilization; 4. A large number of sensor devices are required, which increases production costs. Summary of the invention

[0006] The present application aims to solve the technical problems of the existing method for obtaining the number of cold and hot starts of a steam turbine, which has high production cost, low data utilization, high manpower investment and easy misjudgment, and provides a method, system and program product for obtaining the number of cold and hot starts of a steam turbine.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions: In a first aspect, the present application proposes a method for obtaining the number of cold and hot starts of a steam turbine, comprising: Collect data from the power plant DCS side in real time, obtain real-time data, and store the real-time data in the database; According to the preset measuring points, the real-time data is judged for effective conditions to obtain all start and stop states of the steam turbine on that day; According to the preset time interval, the start and stop status are counted by day, month and year, the statistical results are stored in the database, and sent to the outside through the interface.

[0008] Further, the real-time data includes the steam turbine speed and the temperature of the first-stage metal blade of the high-pressure cylinder.

[0009] Further, the acquisition period for collecting the data on the DCS side of the power plant in real time is 1000 ms; When storing the real-time data into the database, the database compression ratio is less than or equal to 0.001.

[0010] Further, based on the preset measuring points, an effective condition judgment is made on the real-time data to obtain all the start-stop states of the steam turbine on the current day, including: A plurality of real-time measuring points are established in the database, which are respectively used to judge whether the steam turbine speed is greater than the preset speed and record the start-up mode of the steam turbine on the current day; among them, the real-time measuring points for recording the start-up mode of the steam turbine on the current day include the corresponding cold start mode, warm start mode, hot start mode, and extremely hot start mode, which are respectively denoted as the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point; The real-time measuring point for judging whether the steam turbine speed is greater than the preset speed is denoted as the speed measuring point, and it is set that if it is greater than the preset speed, the value of this real-time measuring point is assigned as X, otherwise, it is assigned as Y; Before 24:00 every night, the historical data of the speed measuring point on the current day is extracted from the database; Trace back the record when the speed measuring point on the current day is 1 for the first time in the order from the latest time to the earliest time. If it does not exist, the steam turbine has no start on the current day. Otherwise, judge whether the time stamp T1 of this record is the current day; If the time stamp T1 is the current day, the steam turbine starts on the current day. Otherwise, the steam turbine has no start on the current day; Under the condition that the steam turbine starts on the current day, the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 is used to assign values to the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point to obtain all the start-stop states of the steam turbine on the current day.

[0011] Further, using the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 to assign values to the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point includes: Denote the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 as HPTC_T1; denote the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point as STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot respectively; If HPTC_T1 < 240 °C, then STATUS cold = 1; If 240 °C < HPTC_T1 < 360 °C, then STATUS warm = 1; If 360 °C < HPTC_T1 < 480 °C, then STATUS hot = 1; If 480°C < HPTC_T1, then STATUS extremely hot = 1.

[0012] Further, the interface adopts the OPC communication protocol and the 104 communication protocol, and the data refresh period is 1000 ms.

[0013] In a second aspect, the present application proposes a system for obtaining the number of cold and hot starts of a steam turbine, including: An acquisition module, configured to collect the data on the DCS side of the power plant in real time, obtain real-time data, and store the real-time data in a database; A judgment module, configured to perform an effective condition judgment on the real-time data according to preset measuring points, and obtain all the start-stop states of the steam turbine on the current day; A statistics module, configured to respectively perform statistics on the start-stop states by day, month, and year according to a preset time interval, store the statistical results in a database, and send them out through an interface.

[0014] Further, the real-time data includes the steam turbine speed and the temperature of the first-stage metal blade of the high-pressure cylinder.

[0015] Further, the performing an effective condition judgment on the real-time data according to preset measuring points to obtain all the start-stop states of the steam turbine on the current day includes: Establish a plurality of real-time measuring points in the database, respectively used to judge whether the steam turbine speed is greater than a preset speed and record the start-up mode of the steam turbine on the current day; among them, the real-time measuring points used to record the start-up mode of the steam turbine on the current day include the corresponding cold start mode, warm start mode, hot start mode, and extremely hot start mode, which are respectively denoted as cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point; Denote the real-time measuring point used to judge whether the steam turbine speed is greater than a preset speed as the speed measuring point, and set it as: if it is greater than the preset speed, assign the value X to this real-time measuring point, otherwise, assign the value Y; Before 24:00 every night, extract the historical data of the speed measuring point on the current day from the database; Trace back the record of the first time the speed measuring point is 1 on the current day in the order from the back to the front in time. If it does not exist, the steam turbine has no start on the current day. Otherwise, judge whether the time stamp T1 of this record is the current day; If the time stamp T1 is the current day, the steam turbine starts on the current day. Otherwise, the steam turbine has no start on the current day; Under the condition that the steam turbine starts on the current day, denote the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 as HPTC_T1; denote the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point as STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot respectively; If HPTC_T1 < 240°C, then STATUS cold = 1; If 240°C < HPTC_T1 < 360°C, then STATUS_warm = 1; If 360°C < HPTC_T1 < 480°C, then STATUS_hot = 1; If 480°C < HPTC_T1, then STATUS_extremely_hot = 1; Based on STATUS_cold, STATUS_warm, STATUS_hot, and STATUS_extremely_hot, obtain all start-stop statuses of the steam turbine on the current day.

[0016] In a third aspect, the present application proposes a computer program product, which contains instructions that, when executed by a processor, implement the above-mentioned method for obtaining the number of cold and hot starts of a steam turbine.

[0017] Compared with the prior art, the present application has the following beneficial effects: The present application proposes a method for obtaining the number of cold and hot starts of a steam turbine, which collects real-time data on the DCS side of the power plant and stores it in a database. According to preset measuring points, effective condition judgments are made on the collected real-time data to obtain all start-stop statuses of the steam turbine on the current day. Then, according to a preset time interval, the start-stop statuses are respectively statistically analyzed by day, month, and year, and the statistical results are stored in the database. The present application can solve the problems existing in the method of manually judging and counting the number of cold and hot starts of a steam turbine, improve data reliability, avoid complicated data statistical work, improve work efficiency, solve the data storage problem, and provide a more concise judgment method, saving production costs, and providing data support for the safe, reliable, and economic operation of the unit.

[0018] The present application also proposes a system and a computer program product for obtaining the number of cold and hot starts of a steam turbine, which have all the advantages of the above-mentioned method for obtaining the number of cold and hot starts of a steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a first flow diagram of the method for obtaining the number of cold and hot starts of a steam turbine according to the present application; Figure 2 It is a first flow diagram of the method for obtaining the number of cold and hot starts of a steam turbine according to the present application; Figure 3 It is a topology diagram for real-time automatic collection and storage in the embodiments of the present application; Figure 4 A schematic diagram of a system for acquiring the number of cold and hot starts of a steam turbine in this application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The cold and hot start of the steam turbine is a key operation to ensure the safe operation of the steam turbine. The classification of cold and hot start is mainly based on the metal temperature of the steam turbine components. Among them, cold start refers to the start of the steam turbine when it has not been started for a long time or the metal temperature is lower than a certain level. Hot start refers to the start of the steam turbine when it has just been started and the cylinder body still has residual temperature.

[0028] Recording the cold and hot starts of steam turbines can be used for unit design and life assessment, rationally arranging the startup plan, ensuring operational safety and stability, setting maintenance and overhaul plans, and performing corresponding performance analysis and optimization. Therefore, statistics on the number of cold and hot starts of steam turbines are of great significance. However, the existing methods for obtaining the number of cold and hot starts of steam turbines have technical problems such as high production cost, low data utilization, high manpower investment, and easy misjudgment.

[0029] Based on the above reasons, the present application proposes a method, system and program product for obtaining the number of cold and hot starts of a steam turbine. The present application is described in detail below in conjunction with embodiments and drawings.

[0030] like Figure 1 As shown, it is a first flow chart of a method for obtaining the number of cold and hot starts of a steam turbine in the present application, which may include: S101, collecting data from the DCS side of the power plant in real time, obtaining real-time data, and storing the real-time data in a database.

[0031] In practical applications, the data on the DCS side of a power plant mainly involves monitoring and controlling the production process of the power plant, such as temperature, pressure, flow rate, concentration, etc. Adaptive selection and adjustment can be made according to the specific solutions in the subsequent application.

[0032] S102, based on the preset measuring points, effective condition judgment is performed on the real-time data to obtain all start and stop states of the steam turbine on that day.

[0033] In practical applications, preset measurement points refer to key parameter points that are set in advance in the DCS system to monitor the production process. These measurement points can usually include key production indicators such as temperature, pressure, flow, and liquid level. The specific selection of preset measurement points is based on the requirements of the production process and the need for safe operation. In addition, effective condition judgments can be threshold judgments, trend analysis, and logical judgments, which can be adjusted according to specific judgment methods.

[0034] S103, according to the preset time interval, the start and stop status are counted by day, month and year, the statistical results are stored in the database, and sent to the outside through the interface.

[0035] It should be noted that the length of the preset time interval can be set according to statistical requirements.

[0036] like Figure 2 As shown, it is a second flow chart of a method for obtaining the number of cold and hot starts of a steam turbine in the present application, which may include: S201, real-time automatic acquisition of DCS system measurement points The power industry standard OPC transmission protocol and 104 transmission protocol are applied to send data from the DCS interface machine to the acquisition interface machine. The data is then stored in the real-time database through the forward network gate. The forward network gate uses a network gate that meets the requirements of power production, and the data acquisition frequency is 1000ms. The real-time data acquisition includes the turbine speed and the temperature of the first-stage metal blade of the high-pressure cylinder.

[0037] S202, performing effective condition judgment on the collected data to obtain various start and stop states of the steam turbine on that day.

[0038] The turbine speed measurement point is extracted from the database and recorded as TS, and the first-stage metal blade temperature measurement point is extracted and recorded as HPTC.

[0039] Take a 600MW unit as an example: First, the real-time measurement points STATUS, STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot are established in the database.

[0040] In actual applications, the STATUS data type is digital, and the database compression setting is 0; the STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot data types are int32, and the database compression setting is 0.001. The measuring point STATUS is used to determine in real time whether the turbine speed is greater than 2800rpm. If it is greater than 2800rpm, STATUS is assigned 1; if it is less than 2800rpm, STATUS is assigned 0.

[0041] The measuring points STATUS cold, STATUS warm, STATUS hot and STATUS extremely hot respectively record the start-up mode of the steam turbine on that day, corresponding to the cold start-up mode, warm start-up mode, hot start-up mode and extremely hot start-up mode.

[0042] At 23:50 on the same day, extract the full-day historical data of the STATUS measurement point on the same day from the database, and trace back to the record of the first time the STATUS value on the same day is 1. If the record of the first time the STATUS value on the same day is 1 does not exist, the unit will not be started on that day. If the record of the first time the STATUS value on the same day is 1 exists, get the timestamp of this record, record it as T1, and then determine whether T1 is the zero point of the day: If T1 is zero o'clock on the day, the unit will not be started on that day; if T1 is greater than zero o'clock on the day, the unit will be started on that day.

[0043] Extract the first-stage metal blade temperature measurement points (HPTC) at time T1 from the database, and judge the value of HPTC at time T1, denoted as HPTC_T1: If HPTC_T1 < 240°C, then STATUS cold = 1; STATUS warm = 0; STATUS hot = 0; STATUS extremely hot = 0; The unit startup mode for today is the cold startup mode; If 240°C < HPTC_T1 < 360°C, then STATUS cold = 0; STATUS warm = 1; STATUS hot = 0; STATUS extremely hot = 0; The unit startup mode for today is the warm startup mode; If 360°C < HPTC_T1 < 480°C, then STATUS cold = 0; STATUS warm = 0; STATUS hot = 1; STATUS extremely hot = 0; The unit startup mode for today is the hot startup mode; If 480°C < HPTC_T1, then STATUS cold = 0; STATUS warm = 0; STATUS hot = 0; STATUS extremely hot = 1; The unit startup mode for today is the extremely hot startup mode.

[0044] S203, perform statistics by day, month, and year respectively. Store the statistical results in the database and send them out through the standard interface.

[0045] In practical applications, accumulate STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot by month and year respectively to obtain the monthly cumulative measurement points and annual cumulative measurement points of the startup times of the four startup modes, and store them in the database. Both the real-time data acquisition and the standard external data sending interface can adopt the OPC communication protocol and the 104 communication protocol, and the data refresh period is 1000 ms.

[0046] As Figure 3 shown is the topology diagram for real-time automatic acquisition and storage. Through the acquisition interface machine, the DCS data is transferred from the production area through the firewall and the forward network gateway, and the data is stored in the database server. After the calculation server extracts the rotational speed measurement points and the first-stage metal blade temperature measurement points of the high-pressure cylinder from the database, through the judgment shown in step S202 of this embodiment, the statistical measurement points of the cold and hot startup times are finally obtained and stored in the database. The OPC server uses the standard OPC DA or UA protocol to send the final statistical value to the third party.

[0047] Based on the above method for obtaining the cold and hot startup times of the steam turbine, as Figure 4 shown, this application also proposes a system for obtaining the cold and hot startup times of the steam turbine, which may include: An acquisition module, configured to acquire the data on the DCS side of the power plant in real time, obtain real-time data, and store the real-time data in the database; A judgment module is used to judge the effective conditions of the real-time data according to the preset measuring points, and obtain all the start and stop states of the steam turbine on that day; The statistics module is used to collect statistics on the start and stop status by day, month and year according to the preset time interval, store the statistical results in the database, and send them to the outside through the interface.

[0048] It should be noted that in other embodiments of the system for obtaining the number of cold and hot starts of a steam turbine of the present application, the specific functions in each module may also adopt the embodiments of the method for obtaining the number of cold and hot starts of a steam turbine as described above, which will not be repeated here.

[0049] It should be noted that in the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each module is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules can be combined or integrated into another device, or some features can be ignored or not executed. The module described as a separate component may or may not be physically separated. The component displayed as a module may be a physical unit or multiple physical units, that is, it may be located in one place, or it may be distributed in multiple different places. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0050] In addition, each module in each embodiment of the present invention may be integrated into a processing unit, each module may exist physically separately, or two or more modules may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0051] The present application also proposes a computer program product, which includes instructions, and when the instructions are executed by a processor, the steps in the above-mentioned method for obtaining the number of cold and hot starts of a steam turbine are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in the above-mentioned system embodiment are implemented.

[0052] The computer program may be divided into one or more modules / units, which are stored in a memory and executed by the processor to complete the present application.

[0053] The carrier for implementing the above-mentioned computer program product may be a computer device, or the computer program product may be stored in a computer storage medium.

[0054] The computer device may be a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The computer device may include, but is not limited to, a processor and a memory.

[0055] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0056] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0057] If the module / unit integrated in the computer device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0058] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for obtaining the number of cold and hot starts of a steam turbine, characterized in that: Including: Real-time collect data on the DCS side of the power plant to obtain real-time data, and store the real-time data in the database; According to preset measuring points, judge the effective conditions of the real-time data to obtain all start-stop states of the steam turbine on the current day; According to a preset time interval, statistically analyze the start-stop states by day, month, and year respectively, store the statistical results in the database, and send them out through the interface.

2. The method for obtaining the number of cold and hot starts of a steam turbine according to claim 1, characterized in that: The real-time data includes the steam turbine speed and the temperature of the first-stage metal blade of the high-pressure cylinder.

3. The method for obtaining the number of cold and hot starts of the steam turbine according to claim 2, characterized in that: The acquisition period of the real-time collection of data on the DCS side of the power plant is 1000 ms; When storing the real-time data in the database, the database compression ratio is less than or equal to 0.

001.

4. The method for obtaining the number of cold and hot starts of a steam turbine according to claim 3, characterized in that: The judging the effective conditions of the real-time data according to preset measuring points to obtain all start-stop states of the steam turbine on the current day includes: Establish multiple real-time measuring points in the database, which are respectively used to judge whether the steam turbine speed is greater than the preset speed and record the start-up mode of the steam turbine on the current day; among them, the real-time measuring points used to record the start-up mode of the steam turbine on the current day include the corresponding cold start mode, warm start mode, hot start mode, and extremely hot start mode, which are respectively denoted as cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point; Denote the real-time measuring point used to judge whether the steam turbine speed is greater than the preset speed as the speed measuring point, and set it as: if it is greater than the preset speed, assign the value X to this real-time measuring point, otherwise, assign the value Y; Before 24:00 every night, extract the historical data of the speed measuring point on the current day from the database; Trace back the first record with the value of 1 of the speed measuring point on the current day in the order from the back to the front in time. If it does not exist, the steam turbine has no start on the current day. Otherwise, judge whether the time stamp T1 of this record is the current day; If the time stamp T1 is the current day, the steam turbine starts on the current day. Otherwise, the steam turbine has no start on the current day; Under the condition that the steam turbine starts on the current day, assign values to the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point through the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 to obtain all start-stop states of the steam turbine on the current day.

5. The method for obtaining the number of cold and hot starts of a steam turbine according to claim 4, characterized in that: The assigning values to the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point through the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 includes: Denote the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 as HPTC_T1; denote the cold measuring point, warm measuring point, hot measuring point, and extremely hot measuring point as STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot respectively; If HPTC_T1 < 240 °C, then STATUS cold = 1; If 240 °C < HPTC_T1 < 360 °C, then STATUS warm = 1; If 360 °C < HPTC_T1 < 480 °C, then STATUS hot = 1; If 480 °C < HPTC_T1, then STATUS extremely hot = 1.

6. The method for obtaining the number of cold and hot starts of a steam turbine according to claim 5, characterized in that: The interface adopts the OPC communication protocol and the 104 communication protocol, and the data refresh period is 1000 ms.

7. A system for obtaining the number of cold and hot starts of a steam turbine, characterized in that: Including: An acquisition module, which is used to collect data on the DCS side of the power plant in real time to obtain real-time data, and store the real-time data in the database; A judgment module, configured to perform an effective condition judgment on the real-time data according to preset measurement points, and obtain all start-stop states of the steam turbine on the current day; A statistics module, configured to perform statistics on the start-stop states by day, month, and year respectively according to a preset time interval, store the statistical results in a database, and send them out through an interface.

8. The system for obtaining the number of cold and hot starts of a steam turbine according to claim 7, characterized in that: The real-time data includes the steam turbine speed and the temperature of the first-stage metal blade of the high-pressure cylinder.

9. The system for acquiring the number of cold and hot starts of a steam turbine according to claim 8, characterized in that: The performing an effective condition judgment on the real-time data according to preset measurement points, and obtaining all start-stop states of the steam turbine on the current day includes: Establish a plurality of real-time measurement points in the database, which are respectively used to judge whether the steam turbine speed is greater than a preset speed and record the start-up mode of the steam turbine on the current day; among them, the real-time measurement points used to record the start-up mode of the steam turbine on the current day include the corresponding cold start mode, warm start mode, hot start mode, and extremely hot start mode, which are respectively denoted as cold measurement point, warm measurement point, hot measurement point, and extremely hot measurement point; Denote the real-time measurement point used to judge whether the steam turbine speed is greater than the preset speed as the speed measurement point, and set it as: if it is greater than the preset speed, assign the value X to this real-time measurement point, otherwise, assign the value Y. Before 24:00 every night, extract the historical data of the speed measurement point on the current day from the database. Trace back the record when the speed measurement point on the current day is 1 for the first time in the order from the back to the front in time. If it does not exist, the steam turbine has no start on the current day. Otherwise, judge whether the time stamp T1 of this record is the current day. If the time stamp T1 is the current day, the steam turbine starts on the current day. Otherwise, the steam turbine has no start on the current day. Under the condition that the steam turbine starts on the current day, denote the temperature of the first-stage metal blade of the high-pressure cylinder at the time stamp T1 as HPTC_T1; denote the cold measurement point, warm measurement point, hot measurement point, and extremely hot measurement point as STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot respectively; If HPTC_T1 < 240°C, then STATUS cold = 1; If 240°C < HPTC_T1 < 360°C, then STATUS warm = 1; If 360°C < HPTC_T1 < 480°C, then STATUS hot = 1; If 480°C < HPTC_T1, then STATUS extremely hot = 1; Obtain all start-stop states of the steam turbine on the current day according to STATUS cold, STATUS warm, STATUS hot, and STATUS extremely hot.

10. A computer program product, characterized in that: The computer program product contains instructions, and when the instructions are executed by a processor, the method for obtaining the number of cold and hot starts of a steam turbine as described in any one of claims 1-6 is implemented.

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