A main steam flow calculation method, system, device and medium

Abstract

The application discloses a kind of main steam flow calculation method, system, equipment and medium, comprising: obtaining the monitoring section pressure of steam turbine unit;According to the monitoring section pressure of steam turbine unit, using the approximate corresponding relationship function model of monitoring section pressure and regulation stage pressure, actual operation condition stage group front regulation stage pressure is obtained;According to the actual operation condition stage group front regulation stage pressure, using main steam flow calculation equation, main steam flow is obtained, the method, system, equipment and medium can accurately calculate main steam flow on line.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal-fired power generation and relates to a main steam flow calculation method, system, device and medium. BACKGROUND

[0002] The main steam flow is a key parameter for operation of a thermal power unit. In order to improve economy, the main steam flow of a large steam turbine is generally not obtained through a flow measurement device but is obtained through calculation of a governing stage pressure.

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

[0004]

[0005] wherein G0, P0 and T0 respectively represent design values of the rated operating condition stage group front steam flow, pressure and temperature; G1, P1 and T1 respectively represent measured values of the actual operating condition stage group front steam flow, pressure and temperature; P j represents a design value of the rated operating condition stage group rear steam pressure; P j1 represents a measured value of the actual operating condition stage group rear steam pressure; in the formula, the pressure is an absolute pressure and the temperature is an absolute temperature. The above formula is transformed as:

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

[0007] wherein:

[0008]

[0009] It is shown that, in a variable operating condition, the flow is proportional to the square root of the square difference of the stage group front and rear pressures.

[0010]

[0011] It is shown that the correction of the front temperature change of the stage group before and after the variable operating condition.

[0012] Conditions to be met for application of the Flugel formula:

[0013] a) each stage does not reach a critical state;

[0014] b) the stage number is ≥4, and the more the stage number is, the better;

[0015] c) the through-flow area of each stage is unchanged under different operating conditions;

[0016] d) the flow of each stage is the same under the same operating condition.

[0017] Due to frequent changes in working conditions of a steam turbine generator unit, the environment of the regulating stage pressure measuring point is poor, the error of the regulating stage pressure measuring point is large after long time operation, the main steam flow calculated based on this is inaccurate, if the regulating stage pressure measuring point fails during operation, the main feed water flow and the total air volume of the boiler will be affected, and the disturbance of each parameter is increased. Whether the main steam flow is accurate or not directly affects the accuracy of economic indicators such as heat rate, coal consumption rate, unit efficiency and unit safety, and it is difficult to ensure high online calculation precision and accuracy. SUMMARY

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

[0019] To achieve the above-mentioned purpose, the present application discloses a main steam flow calculation method, comprising:

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

[0021] According to the monitoring section pressure of the steam turbine unit, the approximate corresponding relationship function model of the monitoring section pressure and the regulating stage pressure is used to obtain the actual operating condition stage group front regulating stage pressure;

[0022] According to the actual operating condition stage group front regulating stage pressure, the main steam flow calculation equation is used to obtain the main steam flow.

[0023] The further improvement of the main steam flow calculation method of the present application is that:

[0024] Further, before the step of obtaining the actual operating condition stage group front regulating stage pressure according to the monitoring section pressure of the steam turbine unit, the approximate corresponding relationship function model of the monitoring section pressure and the regulating stage pressure is used, the step further comprises:

[0025] constructing the data set of each monitoring section pressure and regulating stage pressure;

[0026] removing outliers in the data set of each monitoring section pressure and regulating stage pressure, and then constructing the approximate corresponding relationship function model of the monitoring section pressure and the regulating stage pressure according to the data set of each monitoring section pressure and regulating stage pressure.

[0027] Further, for a non-heating condensing steam extraction regenerative 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] Wherein, G1 is the main steam flow, G0 is the main steam flow of the level group under the rated condition, P1 is the adjusting level pressure, P0 is the adjusting level pressure of the level group under the rated condition, T1 is the measured value of the adjusting level temperature, and T0 is the adjusting level temperature of the level group under the rated condition.

[0030] Further, for the heat supply unit, the pressure level between the monitoring section after the adjusting level and the high-pressure cylinder is taken as a level group, and the main steam flow calculation equation is as follows:

[0031]

[0032] Wherein, G1 is the main steam flow, G0 is the main steam flow of the level group under the rated condition, P1 is the adjusting level pressure, P0 is the adjusting level pressure of the level group under the rated condition, T1 is the measured value of the adjusting level temperature, and T0 is the adjusting level temperature of the level group under the rated condition. j P0 is the design value of the high-pressure monitoring section pressure under the rated condition, and P1 is the measured value of the actual high-pressure monitoring section pressure. j1

[0033] The application discloses a main steam flow calculation system, characterized by comprising:

[0034] An acquisition module is configured to acquire the monitoring section pressure of a steam turbine unit.

[0035] A first calculation module is configured to acquire the adjusting level pressure before the level group under the actual operation condition by using an approximate corresponding relation function model of the monitoring section pressure and the adjusting level pressure according to the monitoring section pressure of the steam turbine unit.

[0036] A second calculation module is configured to acquire the main steam flow by using a main steam flow calculation equation according to the adjusting level pressure before the level group under the actual operation condition.

[0037] The main steam flow calculation system is further improved in the application, and the further improvement is characterized by comprising:

[0038] Further, the application further comprises:

[0039] A construction module is configured to construct a data set of the monitoring section pressure and the adjusting level pressure.

[0040] A fitting module is configured to remove outliers in the data set of the monitoring section pressure and the adjusting level pressure, and to construct an approximate corresponding relation function model of the monitoring section pressure and the adjusting level pressure according to the data set.

[0041] Further, for the non-heat-supply condensing type extraction regenerative unit, all the pressure levels between the adjusting level and the low-pressure cylinder exhaust are taken as a level group, and the main steam flow calculation equation is as follows:

[0042] ​

[0043] Wherein, G1 is the main steam flow, G0 is the main steam flow of the level group under the rated working condition, P1 is the adjusting level pressure, P0 is the adjusting level pressure of the level group under the rated working condition, T1 is the measured value of the adjusting level temperature, and T0 is the adjusting level temperature of the level group under the rated working condition.

[0044] Further, for the heat supply unit, the pressure level between the adjusting level and the monitoring section in the high pressure cylinder is taken as a level group, and the main steam flow calculation equation is as follows:

[0045]

[0046] Wherein, G1 is the main steam flow, G0 is the main steam flow of the level group under the rated working condition, P1 is the adjusting level pressure, P0 is the adjusting level pressure of the level group under the rated working condition, T1 is the measured value of the adjusting level temperature, and T0 is the adjusting level temperature of the level group under the rated working condition. j P0 is the design value of the high pressure monitoring section pressure under the rated working condition, and P1 is the measured value of the actual working condition high pressure monitoring section pressure. j1 P0 is the design value of the high pressure monitoring section pressure under the rated working condition, and P1 is the measured value of the actual working condition high pressure monitoring section pressure.

[0047] The application discloses a computer device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the main steam flow calculation method when executing the computer program.

[0048] The application discloses a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program implements the steps of the main steam flow calculation method when executed by a processor.

[0049] The application has the following beneficial effects:

[0050] The main steam flow calculation method, system, device and medium have the following beneficial effects: according to the design parameters and historical operation data of the steam turbine unit, the corresponding relationship between the adjusting level pressure and the monitoring section pressure matched with the actual operation condition is established, the main steam flow of the steam turbine is calculated in detail by using the Frugal formula, various factors affecting the adjusting level pressure in the actual operation process are avoided, the accuracy and reliability of the thermal economic analysis of the power plant are improved, and powerful support is provided for the operation optimization of the power plant. BRIEF DESCRIPTION OF DRAWINGS

[0051] The drawings constituting a part of the specification of the application are used to provide further understanding of the application, the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitation on the application. In the drawings:

[0052] Figure 1A schematic diagram of a main steam flow calculation model for a non-heat-supply condensing extraction regenerative unit;

[0053] Figure 2 A schematic diagram of a main steam flow calculation model for a heat-supply unit;

[0054] Figure 3 A flow chart of the method of the present application. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the protection scope of the present application.

[0056] In the description of the present application, it should be understood that the terms "comprising" and "including" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or sets thereof.

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

[0058] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

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

[0060] Depending on the context, the word "if" as used herein can be interpreted to mean "when" or "while" or "in response to determining" or "in response to detecting." Similarly, the phrase "if it is determined" or "if [a stated condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the stated condition or event]" or "in response to detecting [the stated condition or event]."

[0061] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Generally, the components of the embodiments of the present application described here and shown in the accompanying drawings can be arranged and designed in various different configurations. 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 claimed application, but merely represents a selection of the described embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments disclosed in the present application without creative work fall within the scope of the present application.

[0062] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These diagrams are not drawn to scale, in which some details are exaggerated for the purpose of clarity, and some details can be omitted. The shapes of various regions, layers, and the relative size and positional relationship therebetween shown in the diagrams are merely exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0063] Embodiment One

[0064] Generally, all pressure stages between the governing stage and the exhaust of the low-pressure cylinder are taken as a stage group, and the exhaust pressure of the low-pressure cylinder of the existing large condensing steam turbine is negligible relative to the pressure after the governing stage, so the Frunze formula is simplified as:

[0065]

[0066] For non-heating condensing extraction regenerative unit, formula (5) is widely used. However, the environment of the regulating stage pressure measuring point is poor, the error of the regulating stage pressure measuring point is large after long time operation, the calculated main steam flow is inaccurate, and if the regulating stage pressure measuring 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 each parameter. Based on the accurate and stable monitoring section pressure measuring point, the historical data of the DCS system is extracted, the stable working conditions are selected from the data, the outlier data is removed, and the approximate corresponding relationship f(x3) between each monitoring section pressure and the regulating stage pressure is obtained through big data analysis. The function model is used to replace the regulating stage pressure to calculate the main steam flow, and the main steam flow calculation model based on formula (5) is as shown in Figure 1

[0067] For heating unit, the heating extraction makes the flow of each stage of the steam turbine different, and the heat re-supply unit generally increases the steam supply through the intermediate adjusting door, so that the flow area changes. At this time, the error of the simplified Frigal formula is large. The flow calculation stage group is re-divided, and the pressure stage between the regulating stage and the monitoring section of the high pressure cylinder is taken as a stage group. At this time, the outlet pressure of the stage group cannot be ignored. Combined with the main steam flow calculation method of the non-heating condensing extraction regenerative unit, the main steam flow calculation model based on formula (1) is as shown in Figure 2 , wherein the outlet pressure of the stage group is the monitoring section pressure of the high pressure cylinder, and the pressure after the regulating stage can be replaced by the approximate corresponding relationship function between the monitoring section pressure of the steam turbine and the regulating stage pressure obtained by big data analysis.

[0068] The present application does not have strict requirements for the pressure measuring point after the regulating stage; the extraction unit has little effect on the function model established based on the high pressure cylinder in the present application; and since the function model is fixed, it can be updated at any time according to the demand to adapt to the changes caused by scaling, corrosion and the like in the flow part of the high pressure cylinder. In addition, this measurement method does not need to increase any hardware equipment, all data can be obtained from the existing measurement parameters, only the calculation method needs to be modified, various factors affecting the regulating stage pressure in the actual operation process are avoided, the accuracy and reliability of the main steam flow are considered, the scope of application is wide, the reliability and accuracy of the thermal economic analysis of the power plant are effectively improved, and support is provided for the operation optimization of the power plant.

[0069] Based on the above analysis, referring to Figure 3 , the main steam flow calculation method of the present application 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 data set of each monitoring section pressure and the regulating stage pressure;

[0071] ​2) removing outliers in each monitoring section pressure and adjusting stage pressure data set to screen out stable working condition data, and obtaining an approximate corresponding relationship function model of monitoring section pressure and adjusting stage pressure through big data analysis according to the screened stable working condition data;

[0072] 3) constructing a main steam flow calculation equation according to the design parameters of the steam turbine unit and the Froude formula;

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

[0074] Among them, for the non-heating condensing type extraction regenerative unit, all pressure stages from the adjusting 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 stages from the adjusting stage to the high-pressure cylinder monitoring section are regarded as a stage group, and the high-pressure monitoring section pressure cannot be ignored, so the main steam flow G1 calculation equation in step 3) is:

[0078]

[0079] G0 is the main steam flow of the stage group under the rated working condition, P1 is the adjusting stage pressure, P0 is the adjusting stage pressure of the stage group under the rated working condition, T1 is the measured value of the adjusting stage temperature, and T0 is the adjusting stage temperature of the stage group under the rated working condition, wherein P j is the design value of the high-pressure monitoring section pressure under the rated working condition, and P j1 is the measured value of the actual working condition high-pressure monitoring section pressure.

[0080] Example two

[0081] The main steam flow calculation system provided by the application comprises:

[0082] An acquisition module is configured to acquire the monitoring section pressure of the steam turbine unit.

[0083] A first calculation module is configured to acquire the adjusting stage pressure before the stage group under the actual working condition by using the approximate corresponding relationship function model of the monitoring section pressure and the adjusting stage pressure according to the monitoring section pressure of the steam turbine unit.

[0084] A second calculation module is configured to acquire the main steam flow by using the main steam flow calculation equation according to the adjusting stage pressure before the stage group under the actual working condition.

[0085] As an embodiment of the application, the application further comprises:

[0086] a constructing module, configured to construct the pressure data set of each monitoring stage and the pressure data set of the adjusting stage;

[0087] a fitting module, configured to eliminate outliers in the pressure data set of each monitoring stage and the pressure data set of the adjusting stage, and to construct an approximate corresponding function model of the pressure of each monitoring stage and the pressure of the adjusting stage according to the pressure data set of each monitoring stage and the pressure data set of the adjusting stage.

[0088] As an embodiment of the present application, for a non-heat-supply condensing steam extraction regenerative unit, all pressure stages from the adjusting stage to the exhaust of the low-pressure cylinder are taken as a stage group, and the main steam flow calculation equation is:

[0089]

[0090] wherein G1 is the main steam flow, G0 is the main steam flow of the stage group under the rated working condition, P1 is the adjusting stage pressure, P0 is the adjusting stage pressure of the stage group under the rated working condition, T1 is the measured value of the adjusting stage temperature, and T0 is the adjusting stage temperature of the stage group under the rated working condition.

[0091] As an embodiment of the present application, for a heat-supply unit, the pressure stages from the adjusting stage to the monitoring stage in the high-pressure cylinder are taken as a stage group, and the main steam flow calculation equation is:

[0092]

[0093] wherein G1 is the main steam flow, G0 is the main steam flow of the stage group under the rated working condition, P1 is the adjusting stage pressure, P0 is the adjusting stage pressure of the stage group under the rated working condition, T1 is the measured value of the adjusting stage temperature, and T0 is the adjusting stage temperature of the stage group under the rated working condition, wherein P j is the design value of the high-pressure monitoring stage pressure under the rated working condition, and P j1 is the measured value of the actual working condition high-pressure monitoring stage pressure

[0094] The division of the modules in the embodiments of the present application is illustrative, and is merely a logical function division. In actual implementation, another division manner can be used. In addition, the function modules in each embodiment of the present application can be integrated in one processor, or can be physically separated, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module.

[0095] Embodiment three

[0096] The computer device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the main steam flow calculation method when executing the computer program, for example, comprising: acquiring a monitoring section pressure of a steam turbine unit; obtaining an actual operating condition stage group front governing stage pressure by using a monitoring section pressure and governing stage pressure approximate corresponding relationship function model according to the monitoring section pressure of the steam turbine unit; and obtaining the main steam flow by using a main steam flow calculation equation according to the actual operating condition stage group front governing stage pressure. The memory can comprise a memory, for example, a high-speed random memory, and can also comprise a non-volatile memory, for example, at least one disk memory and the like; the processor, the network interface, and the memory are connected to each other through an internal bus, which can be an industry standard architecture bus, a peripheral component interconnect standard bus, an extended industry standard structure bus, and the like, and the bus can be divided into an address bus, a data bus, a control bus, and the like. The memory is used for storing a program, and specifically, the program can comprise program code, and the program code comprises computer operation instructions. The memory can comprise a memory and a non-volatile memory, and provides instructions and data for the processor.

[0097] Embodiment four

[0098] A computer readable storage medium stores a computer program, and the computer program implements the steps of the main steam flow calculation method when executed by a processor, for example, comprising: acquiring a monitoring section pressure of a steam turbine unit; obtaining an actual operating condition stage group front governing stage pressure by using a monitoring section pressure and governing stage pressure approximate corresponding relationship function model according to the monitoring section pressure of the steam turbine unit; and obtaining the main steam flow by using a main steam flow calculation equation according to the actual operating condition stage group front governing stage pressure. Specifically, the computer readable storage medium comprises but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory can comprise a random access memory (RAM) and / or a cache memory, and the like. The non-volatile memory can comprise a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, and the like.

[0099] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt a computer program product in the form of being implemented on one or more computer usable storage media (including but not limited to a disk memory, a CD-ROM, an optical memory, and the like) containing computer usable program codes.

[0100] The present application is described in reference to the flow diagrams and / or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the present application. It will be understood that each block of the flow diagrams and / or block diagrams, and combinations of blocks in the flow diagrams and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flow diagrams and / or block diagrams block or blocks. Figure 1 The flow diagram and / or block diagram in which the flow diagram and / or block diagram and combinations of blocks in the flow diagrams and / or block diagrams Figure 1 The flow diagram and / or block diagram in which the flow diagram and / or block diagram and combinations of blocks in the flow diagrams and / or block diagrams

[0101] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flow diagrams and / or block diagrams block or blocks. Figure 1 The flow diagram and / or block diagram in which the flow diagram and / or block diagram and combinations of blocks in the flow diagrams and / or block diagrams Figure 1 The flow diagram and / or block diagram in which the flow diagram and / or block diagram and combinations of blocks in the flow diagrams and / or block diagrams

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow diagrams and / or block diagrams block or blocks. Figure 1 The flow diagram and / or block diagram in which the flow diagram and / or block diagram and combinations of blocks in the flow diagrams and / or block diagrams Figure 1 The flow diagram and / or block diagram in which the flow diagram and / or block diagram and combinations of blocks in the flow diagrams and / or block diagrams

[0103] Other embodiments of the present application will be apparent to those of ordinary skill in the art from the disclosure and description of the application. The present application is intended to cover any and all modifications and changes of the present application which follow within the scope and spirit of the present application. The above description and examples are intended to be illustrative and not restrictive. The scope of the application should be determined with reference to the appended claims.

[0104] It is to be understood that the application is not limited to the precise construction described in the specification above and shown in the accompanying drawings; various modifications and changes can be made thereunto without departing from the scope thereof. The scope of the application is to be defined by the appended claims rather than by the description preceding them.

[0105] The above description is only the preferred embodiment of the present application, not any limitation to the present application, any simple modification, change and equivalent structure change of the above embodiment according to the technical essence of the present application are still within the protection scope of the technical solution of the present application.

Claims

1. A method for calculating main steam flow rate, characterized in that, include: Obtain the pressure of the monitored section of the steam turbine unit; Based on the monitoring section pressure of the turbine unit, the pressure of the regulating stage before the turbine unit under actual operating conditions is obtained by using the approximate correspondence function model between the monitoring section pressure and the regulating stage pressure. By analyzing big data, an approximate correspondence between the pressure of each monitoring section and the pressure of the regulating stage is obtained. This function model is then used to replace the regulating stage pressure in calculating the main steam flow. Before using the approximate correspondence function model between the monitoring section pressure and the regulating stage pressure based on the monitoring section pressure of the turbine unit, the following steps are also included: Construct datasets for the pressure of each monitoring segment and the pressure of the regulating stage; Outliers in the pressure datasets of each monitoring segment and the regulating stage are removed, and then an approximate correspondence function model between the pressure of the monitoring segment and the pressure of the regulating stage is constructed based on the pressure datasets of each monitoring segment and the regulating stage.

2. The main steam flow calculation method according to claim 1, characterized in that, For a non-heating condensing extraction regenerative turbine unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are considered as a single stage group. The main steam flow calculation equation is then: in, Main steam flow rate, This refers to the main steam flow rate of the stage under rated operating conditions. P 1 represents the regulating stage pressure. P 0 represents the regulating stage pressure of the unit under rated operating conditions. .

3. The method for calculating main steam flow rate according to claim 1, characterized in that, For heating units, if the pressure stages from the regulating stage to the monitoring section in the high-pressure cylinder are considered as a single stage group, then the main steam flow calculation equation is: in, Main steam flow rate, This refers to the main steam flow rate of the stage under rated operating conditions. P 1 represents the regulating stage pressure. P 0 represents the regulating stage pressure of the unit under rated operating conditions. ,in, P j This is the design value for the pressure of the high-pressure monitoring section under rated operating conditions. P j1 The pressure measurement value is for the high-pressure monitoring section under actual working conditions.

4. A main steam flow calculation system, characterized in that, include: The acquisition module is used to acquire the pressure of the monitoring section of the steam turbine unit; The first calculation module is used to obtain the pressure of the regulating stage before the turbine unit under actual operating conditions by using the approximate correspondence function model between the monitoring stage pressure and the regulating stage pressure based on the monitoring stage pressure of the turbine unit. The second calculation module is used to obtain the approximate correspondence between the pressure of each monitoring section and the pressure of the regulating stage through big data analysis, and to use this function model to replace the regulating stage pressure to calculate the main steam flow. Before using the approximate correspondence function model between the monitoring section pressure and the regulating stage pressure based on the monitoring section pressure of the turbine unit, the following steps are also included: Construct datasets for the pressure of each monitoring segment and the pressure of the regulating stage; Outliers in the pressure datasets of each monitoring segment and the regulating stage are removed, and then an approximate correspondence function model between the pressure of the monitoring segment and the pressure of the regulating stage is constructed based on the pressure datasets of each monitoring segment and the regulating stage.

5. The main steam flow calculation system according to claim 4, characterized in that, Also includes: The module is used to build pressure datasets for each monitoring segment and regulation stage. The fitting module is used to remove outliers from the pressure datasets of each monitoring segment and the pressure of the regulating stage, and then construct an approximate correspondence function model between the pressure of the monitoring segment and the pressure of the regulating stage based on the pressure datasets of each monitoring segment and the pressure of the regulating stage.

6. The main steam flow calculation system according to claim 4, characterized in that, For a non-heating condensing extraction regenerative turbine unit, all pressure stages from the regulating stage to the low-pressure cylinder exhaust are considered as a single stage group. The main steam flow calculation equation is then: in, Main steam flow rate, This refers to the main steam flow rate of the stage under rated operating conditions. P 1 represents the regulating stage pressure. P 0 represents the regulating stage pressure of the unit under rated operating conditions. .

7. The main steam flow calculation system according to claim 4, characterized in that, For heating units, if the pressure stages from the regulating stage to the monitoring section in the high-pressure cylinder are considered as a single stage group, then the main steam flow calculation equation is: in, Main steam flow rate, This refers to the main steam flow rate of the stage under rated operating conditions. P 1 represents the regulating stage pressure. P 0 represents the regulating stage pressure of the unit under rated operating conditions. ,in, P j This is the design value for the pressure of the high-pressure monitoring section under rated operating conditions. P j1 The pressure measurement value is for the high-pressure monitoring section under actual working conditions.

8. 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, it implements the steps of the main steam flow calculation method as described in any one of claims 1-3.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the main steam flow calculation method as described in any one of claims 1-3.

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