Main steam flow calculation method, system, equipment and medium

Abstract

The invention discloses a main steam flow calculation method, system and device and a medium. The method comprises the steps that the monitoring section pressure of a turboset is obtained; according to the monitoring section pressure of the steam turbine set, the adjusting stage pressure before the actual operation condition stage set is obtained through an approximate corresponding relation function model of the monitoring section pressure and the adjusting stage pressure; the main steam flow is obtained through a main steam flow calculation equation according to the adjusting stage pressure before the actual operation condition stage group, and the method, the system, the equipment and the medium can accurately calculate the main steam flow on line.

Description

Technical Field

[0001] The invention belongs to the technical field of coal-fired power generation, and relates to a main steam flow calculation method, system, equipment and medium. Background Art

[0002] The main steam flow rate is a key parameter for the operation of thermal power units. In order to improve economy, the main steam flow rate of large steam turbines is generally not obtained through flow measurement devices, but through regulating stage pressure calculation.

[0003] At present, the Flugel formula is widely used to calculate the main steam flow:

[0004]

[0005] Among them, G0, P0, T0 represent the design values ​​of steam flow, pressure and temperature before the rated working condition stage group respectively; G1, P1, T1 represent the measured values ​​of steam flow, pressure and temperature before the actual operating condition stage group respectively; P j Indicates the design value of steam pressure after the rated working condition stage group; P j1 It indicates the measured value of steam pressure after the stage group under actual operating conditions; the pressure is the absolute pressure and the temperature is the absolute temperature. The above formula is transformed into:

[0006] G1=f(x1)f(x2)G0 (2)

[0007] in:

[0008]

[0009] It shows that when operating under variable conditions, the flow rate is proportional to the square root of the square difference of the pressure before and after the stage group.

[0010]

[0011] Indicates the correction of the temperature change before and after the stage group changes.

[0012] The conditions that must be met to apply the Flugel formula are:

[0013] a) None of the levels have reached critical status;

[0014] b) The number of levels is ≥ 4, the more the better;

[0015] c) The flow area of ​​each level remains unchanged under different working conditions;

[0016] d) The flow rates at each level under the same operating condition are the same.

[0017] Due to the frequent changes in the working conditions of the steam turbine generator set, the environment in which the regulating stage pressure measurement point is located is harsh, and the error of the regulating stage pressure measurement point after long-term operation is large. The main steam flow calculated based on this is inaccurate. If the regulating stage pressure measurement point fails during operation, it will affect the main feed water flow and the total air volume of the boiler, and increase the disturbance of various parameters. The accuracy of the main steam flow directly affects the accuracy of economic indicators such as heat consumption rate, coal consumption rate, and unit efficiency, as well as the safety of the unit. It is difficult to ensure its high online calculation accuracy and accuracy. Summary of the invention

[0018] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a main steam flow calculation method, system, equipment and medium, which can accurately calculate the main steam flow online.

[0019] To achieve the above object, the present invention discloses a main steam flow calculation method, comprising:

[0020] Obtain the monitoring section pressure of the steam turbine unit;

[0021] According to the monitoring section pressure of the steam turbine unit, the regulating stage pressure before the stage group in the actual operating condition is obtained by using the approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure;

[0022] According to the actual operating conditions, the stage pressure before the stage group is adjusted, and the main steam flow rate is obtained by using the main steam flow rate calculation equation.

[0023] The main steam flow calculation method of the present invention is further improved in that:

[0024] Furthermore, the method further includes:

[0025] Construct pressure data sets for each monitoring section and regulating level;

[0026] The outliers in each monitoring section pressure and regulating stage pressure data set are eliminated, and then an approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure is constructed according to the monitoring section pressure and regulating stage pressure data set.

[0027] Furthermore, for a non-heating condensing steam extraction and reheat recovery unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are regarded as a stage group, and the main steam flow calculation equation is:

[0028]

[0029] Among them, G1 is the main steam flow rate, G0 is the main steam flow rate of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, and T0 is the regulating stage temperature of the stage group under rated conditions.

[0030] Furthermore, for the heating unit, the pressure level between the regulating stage and the monitoring section in the high-pressure cylinder is regarded as a level group, and the main steam flow calculation equation is:

[0031]

[0032] Among them, G1 is the main steam flow, G0 is the main steam flow of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, T0 is the regulating stage temperature of the stage group under rated conditions, among which, P j P is the design value of the high pressure monitoring section pressure under rated working conditions, j1 It is the pressure measurement value of the high-pressure monitoring section under actual working conditions.

[0033] The present invention discloses a main steam flow calculation system, which is characterized by comprising:

[0034] An acquisition module, used for acquiring the monitoring section pressure of the steam turbine unit;

[0035] The first calculation module is used to obtain the regulating stage pressure before the stage group in the actual operating condition according to the monitoring stage pressure of the steam turbine group by using the approximate corresponding relationship function model between the monitoring stage pressure and the regulating stage pressure;

[0036] The second calculation module is used to adjust the stage pressure before the stage group according to the actual operating condition and obtain the main steam flow rate by using the main steam flow rate calculation equation.

[0037] The main steam flow calculation system of the present invention is further improved in that:

[0038] Furthermore, it also includes:

[0039] A construction module is used to construct a data set of pressure of each monitoring section and a pressure of a regulating stage;

[0040] The fitting module is used to remove outliers in the monitoring section pressure and regulating stage pressure data sets, and then construct an approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure according to the monitoring section pressure and regulating stage pressure data sets.

[0041] Furthermore, for a non-heating condensing steam extraction and reheat recovery unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are regarded as a stage group, and the main steam flow calculation equation is:

[0042]

[0043] Among them, G1 is the main steam flow rate, G0 is the main steam flow rate of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, and T0 is the regulating stage temperature of the stage group under rated conditions.

[0044] Furthermore, for the heating unit, the pressure level between the regulating stage and the monitoring section in the high-pressure cylinder is regarded as a level group, and the main steam flow calculation equation is:

[0045]

[0046] Among them, G1 is the main steam flow, G0 is the main steam flow of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, T0 is the regulating stage temperature of the stage group under rated conditions, among which, P j P is the design value of the high pressure monitoring section pressure under rated working conditions, j1 It is the pressure measurement value of the high-pressure monitoring section under actual working conditions.

[0047] The present invention discloses a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the main steam flow calculation method are implemented.

[0048] The present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the main steam flow calculation method are implemented.

[0049] The present invention has the following beneficial effects:

[0050] During specific operation, the main steam flow calculation method, system, equipment and medium described in the present invention establish a corresponding relationship between the regulating stage pressure and the monitoring section pressure that matches the actual operating conditions based on the design parameters of the steam turbine unit and historical operating data, and use the Flugel formula to finely calculate the main steam flow of the steam turbine, thereby avoiding various factors that affect the regulating stage pressure during actual operation, improving the accuracy and reliability of the thermal economic analysis of the power plant, and providing strong support for the optimization of power plant operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0052] Figure 1It is a schematic diagram of the main steam flow calculation model of the non-heating condensing extraction steam reheat unit;

[0053] Figure 2 It is a schematic diagram of the main steam flow calculation model of the heating unit;

[0054] Figure 3 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0056] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0057] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0058] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0059] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0060] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0061] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0062] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0063] Embodiment 1

[0064] In general, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are considered as a stage group. The exhaust pressure of the low-pressure cylinder of the existing large condensing steam turbine can be ignored relative to the pressure after the regulating stage. Therefore, the Flugel formula is simplified to:

[0065]

[0066] For non-heating condensing extraction and reheat recovery units, this formula (5) is widely used. However, the regulating stage pressure measurement point is located in a harsh environment. The error of the regulating stage pressure measurement point is large after long-term operation. The main steam flow based on the calculation is inaccurate. If the regulating stage pressure measurement point fails during operation, it will affect the main feed water flow and the total air volume of the boiler, and increase the disturbance of various parameters. Based on the accuracy and stability of the monitoring section pressure measurement point, the historical data of the DCS system is extracted, the stable working conditions are screened out, and the outlier data is eliminated. The approximate correspondence f(x3) between the pressure of each monitoring section and the regulating stage pressure is obtained through big data analysis. This function model is used to replace the regulating stage pressure to calculate the main steam flow. The main steam flow calculation model based on formula (5) is as follows Figure 1 shown.

[0067] For heating units, the heating extraction makes the flow rates of each stage of the steam turbine different, and the hot re-steam supply unit generally increases the steam supply through the middle regulating valve, and the flow area changes. At this time, the calculation error using the simplified Frugel formula is large. Re-divide the flow calculation stage group, and take the pressure stage from the regulating stage to a certain monitoring section of the high-pressure cylinder as a stage group. At this time, the stage group outlet pressure cannot be ignored. Combined with the above-mentioned non-heating condensing extraction reheat unit main steam flow calculation method, the main steam flow calculation model based on formula (1) is as follows Figure 2 , where the pressure at the stage group outlet is the high-pressure cylinder monitoring section pressure, and the pressure after the regulating stage can still be replaced by the approximate correspondence function between the pressure of each monitoring section of the steam turbine and the regulating stage pressure obtained by big data analysis.

[0068] The present invention has no strict requirements for the pressure measurement point after the regulating stage; the extraction unit has almost no effect on the function model established based on the high-pressure cylinder in the present invention; and because the function model is fixed, it can be updated at any time according to demand to adapt to changes in the flow part of the high-pressure cylinder due to scaling, corrosion, etc. In addition, this measurement method does not require the addition of any hardware equipment, and all data can be obtained from the existing measurement parameters. Only the calculation method needs to be modified, avoiding various factors that affect the pressure of the regulating stage during actual operation. It is simple and economical, taking into account the accuracy and reliability of the main steam flow, and has a wide range of applications. It effectively improves the reliability and accuracy of the thermal economic analysis of the power plant and provides support for the optimization of power plant operation.

[0069] Based on the above analysis, reference Figure 3 The main steam flow calculation method of the present invention comprises the following steps:

[0070] 1) Obtain the design parameters of the steam turbine unit, obtain the historical operation data of the DCS, and obtain the pressure data sets of each monitoring section and the regulating stage;

[0071] 2) Eliminate outliers in the data sets of each monitoring section pressure and regulating stage pressure to screen out stable operating condition data, and obtain an approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure through big data analysis based on the screened stable operating condition data;

[0072] 3) Construct the main steam flow calculation equation based on the steam turbine unit design parameters and Frugel's formula;

[0073] 4) Substitute the actual operating measurement point data into the main steam flow calculation equation to obtain the main steam flow.

[0074] Among them, for the non-heating condensing steam extraction and reheating unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are regarded as a stage group, and the main steam flow calculation equation in step 3) is:

[0075]

[0076] Among them, G1 is the main steam flow.

[0077] For the heating unit, the flow calculation stage group is re-divided, and the pressure stage between the regulating stage and the monitoring section in the high-pressure cylinder is taken as a stage group. The pressure of the high-pressure monitoring section cannot be ignored. At this time, the calculation equation of the main steam flow G1 in step 3) is:

[0078]

[0079] G0 is the main steam flow of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, T0 is the regulating stage temperature of the stage group under rated conditions, where P j P is the design value of the high pressure monitoring section pressure under rated working conditions, j1 It is the pressure measurement value of the high-pressure monitoring section under actual working conditions.

[0080] Embodiment 2

[0081] The main steam flow calculation system of the present invention comprises:

[0082] An acquisition module, used for acquiring the monitoring section pressure of the steam turbine unit;

[0083] The first calculation module is used to obtain the regulating stage pressure before the stage group in the actual operating condition according to the monitoring stage pressure of the steam turbine group by using the approximate corresponding relationship function model between the monitoring stage pressure and the regulating stage pressure;

[0084] The second calculation module is used to adjust the stage pressure before the stage group according to the actual operating condition and obtain the main steam flow rate by using the main steam flow rate calculation equation.

[0085] As an embodiment of the present invention, it also includes:

[0086] A construction module is used to construct a data set of pressure of each monitoring section and a pressure of a regulating stage;

[0087] The fitting module is used to remove outliers in the monitoring section pressure and regulating stage pressure data sets, and then construct an approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure according to the monitoring section pressure and regulating stage pressure data sets.

[0088] As an implementation mode of the present invention, for a non-heating condensing steam extraction and regeneration unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are regarded as a stage group, and the main steam flow calculation equation is:

[0089]

[0090] Among them, G1 is the main steam flow rate, G0 is the main steam flow rate of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, and T0 is the regulating stage temperature of the stage group under rated conditions.

[0091] As an implementation mode of the present invention, for a heating unit, the pressure level between the regulating stage and the monitoring section in the high-pressure cylinder is regarded as a level group, and the main steam flow calculation equation is:

[0092]

[0093] Among them, G1 is the main steam flow, G0 is the main steam flow of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, T0 is the regulating stage temperature of the stage group under rated conditions, among which, P j P is the design value of the high pressure monitoring section pressure under rated working conditions, j1 The pressure measurement value of the high pressure monitoring section under actual working conditions

[0094] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0095] Embodiment 3

[0096] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the main steam flow calculation method are implemented, for example, including: obtaining the monitoring section pressure of the steam turbine unit; obtaining the regulating stage pressure before the stage group under the actual operating condition by using the approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure; obtaining the main steam flow by using the main steam flow calculation equation according to the regulating stage pressure before the stage group under the actual operating condition. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0097] Embodiment 4

[0098] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the main steam flow calculation method are implemented, for example, including: obtaining the monitoring section pressure of the steam turbine unit; according to the monitoring section pressure of the steam turbine unit, using the approximate correspondence function model between the monitoring section pressure and the regulating stage pressure, obtaining the regulating stage pressure before the stage group under the actual operating condition; according to the regulating stage pressure before the stage group under the actual operating condition, using the main steam flow calculation equation, obtaining the main steam flow. Specifically, the computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0099] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0100] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0103] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0104] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0105] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A main steam flow calculation method, characterized in that: include: Obtain the monitoring section pressure of the steam turbine unit; According to the monitoring section pressure of the steam turbine unit, the regulating stage pressure before the stage group in the actual operating condition is obtained by using the approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure; According to the actual operating conditions, the stage pressure before the stage group is adjusted, and the main steam flow rate is obtained by using the main steam flow rate calculation equation.

2. The main steam flow calculation method according to claim 1, characterized in that: The method further includes: Construct pressure data sets for each monitoring section and regulating level; The outliers in each monitoring section pressure and regulating stage pressure data set are eliminated, and then an approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure is constructed according to the monitoring section pressure and regulating stage pressure data set.

3. The main steam flow calculation method according to claim 1, characterized in that: For a non-heating condensing extraction reheat unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are considered as a stage group, and the main steam flow calculation equation is: Among them, G1 is the main steam flow rate, G0 is the main steam flow rate of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, and T0 is the regulating stage temperature of the stage group under rated conditions.

4. The main steam flow calculation method according to claim 1, characterized in that: For the heating unit, the pressure stage from the regulating stage to the monitoring section in the high-pressure cylinder is regarded as a stage group, and the main steam flow calculation equation is: Among them, G1 is the main steam flow, G0 is the main steam flow of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, T0 is the regulating stage temperature of the stage group under rated conditions, among which, P j P is the design value of the high pressure monitoring section pressure under rated working conditions, j1 It is the pressure measurement value of the high-pressure monitoring section under actual working conditions.

5. A main steam flow calculation system, characterized in that: include: An acquisition module, used for acquiring the monitoring section pressure of the steam turbine unit; The first calculation module is used to obtain the regulating stage pressure before the stage group in the actual operating condition according to the monitoring stage pressure of the steam turbine group by using the approximate corresponding relationship function model between the monitoring stage pressure and the regulating stage pressure; The second calculation module is used to adjust the stage pressure before the stage group according to the actual operating condition and obtain the main steam flow rate by using the main steam flow rate calculation equation.

6. The main steam flow calculation system according to claim 5, characterized in that: Also includes: A construction module is used to construct a data set of pressure of each monitoring section and a pressure of a regulating stage; The fitting module is used to remove outliers in the monitoring section pressure and regulating stage pressure data sets, and then construct an approximate corresponding relationship function model between the monitoring section pressure and the regulating stage pressure according to the monitoring section pressure and regulating stage pressure data sets.

7. The main steam flow calculation system according to claim 5, characterized in that: For a non-heating condensing extraction reheat unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are considered as a stage group, and the main steam flow calculation equation is: Among them, G1 is the main steam flow rate, G0 is the main steam flow rate of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, and T0 is the regulating stage temperature of the stage group under rated conditions.

8. The main steam flow calculation system according to claim 5, characterized in that: For the heating unit, the pressure stage from the regulating stage to the monitoring section in the high-pressure cylinder is regarded as a stage group, and the main steam flow calculation equation is: Among them, G1 is the main steam flow, G0 is the main steam flow of the stage group under rated conditions, P1 is the regulating stage pressure, P0 is the regulating stage pressure of the stage group under rated conditions, T1 is the measured value of the regulating stage temperature, T0 is the regulating stage temperature of the stage group under rated conditions, among which, P j P is the design value of the high pressure monitoring section pressure under rated working conditions, j1 It is the pressure measurement value of the high-pressure monitoring section under actual working conditions.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the main steam flow calculation method according to any one of claims 1 to 4 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the main steam flow calculation method according to any one of claims 1 to 4 are implemented.

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