Method and device for determining load correction curve of steam turbine generator set

Abstract

The application provides a kind of determination method and device of steam turbine generator set load correction curve, belong to steam turbine generator set control technical field.Method includes: obtaining the load value, regulated stage rear steam pressure value, main steam temperature value and reheat steam temperature value when regulated stage rear steam pressure of unit is in preset interval under different back pressure value in the state of thermal system isolation and main steam valve opening unchanged;Based on regulated stage rear steam pressure value, main steam temperature value and reheat steam temperature value, the corresponding load value is corrected to obtain the corresponding load correction value;With the load correction value corresponding to any end value of back pressure value as reference value, the load change rate of each load correction value is determined;Based on back pressure value and load change rate, the steam turbine generator set load correction curve is determined.The application has the advantages of less data acquisition, less data processing workload, simple calculation process, low test cost, high work efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of steam turbine generator set control technology, specifically to a method for determining a load correction curve for a steam turbine generator set, a device for determining a load correction curve for a steam turbine generator set, an electronic device, and a readable storage medium. Background Technology

[0002] During daily operation, the back pressure of steam turbines in thermal power generating units varies greatly due to factors such as significant changes in circulating cooling water temperature caused by seasonal variations. Among all operating thermodynamic parameters of steam turbine generator units, operating back pressure is one of the main parameters that has the greatest impact on the unit's economic performance. This results in a significant impact on the unit load and the steam turbine heat rate. Therefore, accurately obtaining the correction curve of steam turbine operating back pressure on unit load is of great significance for the economic diagnosis and operation adjustment of steam turbine units.

[0003] For steam turbines with different parameters and types, the impact of the same change in back pressure on the unit load varies. However, obtaining a correction curve through theoretical calculations is complex, requires a large amount of data, and is easily affected by the cumulative measurement errors of various parameters in the thermodynamic system, thus impacting calculation accuracy. Currently, the industry commonly uses high-precision experimental measurements to determine the correction curve of back pressure on the unit load. This requires thermodynamic performance testing of the steam turbine, the installation of numerous test measurement points, and detailed calculations according to relevant steam turbine test procedures, making the process quite complex. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for determining the load correction curve of a steam turbine generator set, so as to at least solve the above-mentioned problems that require high-precision experimental measurement of the back pressure to the unit load correction curve, which necessitates thermal performance testing of the steam turbine, the installation of numerous test measurement points, and the complex calculation process that requires detailed calculation according to relevant steam turbine test procedures.

[0005] To achieve the above objectives, a first aspect of the present invention provides a method for determining a load correction curve for a steam turbine generator set, wherein the load correction curve is used to correct the operating parameters of the steam turbine generator set, and the method includes:

[0006] Under the conditions of thermal system isolation and constant main steam valve opening, the load value, the steam pressure value after the regulating stage of the unit is within the preset range under different back pressure values, the main steam temperature value and the reheat steam temperature value are obtained.

[0007] The corresponding load value is corrected based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value to obtain the corresponding load correction value;

[0008] Using the load correction value corresponding to any one of the back pressure values ​​as a reference value, determine the load change rate for each load correction value;

[0009] Based on the back pressure value and the load change rate, the load correction curve of the steam turbine generator set is determined.

[0010] Optionally, the load value is corrected based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value to obtain a corresponding load correction value, including:

[0011] For each load value:

[0012] The load value is corrected based on the corresponding steam pressure value after the regulating stage to obtain the first corrected load value corresponding to the load value.

[0013] Based on the corresponding main steam temperature value, the first corrected load value corresponding to the load value is corrected to obtain the corresponding second corrected load value;

[0014] The second corrected load value corresponding to the load value is corrected based on the reheat steam temperature value to obtain the corresponding load correction value.

[0015] Optionally, the load value is corrected based on the corresponding regulating stage downstream steam pressure value to obtain a first corrected load value, including:

[0016] Calculate the average steam pressure value after all regulating stages;

[0017] Using the average value as a reference value, the steam pressure change rate of the steam pressure value after each regulation stage is calculated;

[0018] Based on the first preset curve or the first preset table, the load change rate corresponding to each steam pressure change rate is determined. The first preset curve or the first preset table is used to characterize the relationship between the steam pressure change rate of the steam pressure value after different regulation stages of the unit and the load change rate of the corresponding load value.

[0019] Based on the load change rate and the load value, the corresponding first corrected load value is obtained.

[0020] Optionally, based on the corresponding main steam temperature value, the first corrected load value corresponding to the load value is corrected to obtain the corresponding second corrected load value, including:

[0021] Based on the second preset curve or the second preset table, the first load correction coefficient corresponding to the main steam temperature value is determined. The second preset curve or the second preset table is used to characterize the relationship between different main steam temperature values ​​of the unit and the corresponding first load correction coefficient.

[0022] Based on the first load correction factor and the first corrected load value, the corresponding second corrected load value is obtained.

[0023] Optionally, based on the reheat steam temperature value, a second corrected load value corresponding to the load value is applied to obtain a corresponding load correction value, including:

[0024] Based on the third preset curve or the third preset table, the second load correction coefficient corresponding to the reheat steam temperature value is determined. The third preset curve or the third preset table are used to characterize the relationship between different reheat steam temperature values ​​of the unit and the corresponding second load correction coefficient.

[0025] Based on the second load correction factor and the second corrected load value, the corresponding load correction value is obtained.

[0026] Optionally, using the load correction value corresponding to any one of the back pressure values ​​as a reference value, the load change rate of each load correction value is determined, including:

[0027] Using the load correction value corresponding to the minimum back pressure value as the benchmark value, the load change rate of each load correction value is calculated.

[0028] A second aspect of the present invention provides an apparatus for determining a load correction curve for a steam turbine generator set, wherein the load correction curve is used to correct the operating parameters of the steam turbine generator set, and the apparatus includes:

[0029] The parameter acquisition module is used to acquire the load value, the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value of the unit when the back pressure value is within the preset range under different back pressure values, with the thermal system isolated and the main steam regulating valve opening unchanged.

[0030] The load correction value determination module is used to correct the corresponding load value based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value to obtain the corresponding load correction value.

[0031] The load change rate determination module is used to determine the load change rate of each load correction value based on the load correction value corresponding to any end value of the back pressure value.

[0032] The load correction curve determination module is used to determine the load correction curve of the steam turbine generator set based on the back pressure value and the load change rate.

[0033] Optionally, the load correction value determination module is specifically used for:

[0034] For each load value:

[0035] The load value is corrected based on the corresponding steam pressure value after the regulating stage to obtain the first corrected load value corresponding to the load value.

[0036] Based on the corresponding main steam temperature value, the first corrected load value corresponding to the load value is corrected to obtain the corresponding second corrected load value;

[0037] The second corrected load value corresponding to the load value is corrected based on the reheat steam temperature value to obtain the corresponding load correction value.

[0038] A third aspect of the present invention provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for determining the load correction curve of a steam turbine generator set.

[0039] A fourth aspect of the present invention provides a readable storage medium storing instructions for causing a machine to perform the above-described method for determining the load correction curve of a steam turbine generator set.

[0040] This technical solution corrects the corresponding load values ​​based on the steam pressure, main steam temperature, and reheat steam temperature after the regulating stage to obtain the corresponding load correction values. Using the load correction value corresponding to the end value in the back pressure range as the benchmark, the corrected load change rate for each load correction value is determined. Then, based on the back pressure value and the unit load change rate, the turbine generator set load correction curve is determined. The calculation process requires less online data acquisition, is simple, significantly reduces the workload of data processing, improves work efficiency, lowers testing costs, and yields a high-accuracy turbine generator set load correction curve.

[0041] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0042] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0043] Figure 1 This is a flowchart of the method for determining the load correction curve of a steam turbine generator set provided by the present invention;

[0044] Figure 2 This is a flowchart for determining load correction values ​​provided by the present invention;

[0045] Figure 3 This is a schematic diagram of the load correction curve provided by the present invention;

[0046] Figure 4 This is a schematic diagram of the device for determining the load correction curve of a steam turbine generator set provided by the present invention;

[0047] Figure 5 This is a schematic diagram of the second preset curve in Embodiment 5 provided by the present invention;

[0048] Figure 6 This is a schematic diagram of the third preset curve in Embodiment 5 provided by the present invention;

[0049] Figure 7 This is a schematic diagram of the load correction curve in Embodiment 5 provided by the present invention.

[0050] Explanation of reference numerals in the attached figures

[0051] 10 - Parameter acquisition module; 20 - Load correction value determination module;

[0052] 30 - Load change rate determination module; 40 - Load correction curve determination module. Detailed Implementation

[0053] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0054] Figure 1 This is a flowchart of the method for determining the load correction curve of a steam turbine generator set provided by the present invention; Figure 2 This is a flowchart for determining load correction values ​​provided by the present invention; Figure 3 This is a schematic diagram of the load correction curve provided by the present invention; Figure 4 This is a schematic diagram of the device for determining the load correction curve of a steam turbine generator set provided by the present invention; Figure 5 This is a schematic diagram of the second preset curve in Embodiment 5 provided by the present invention;

[0055] Figure 6 This is a schematic diagram of the third preset curve in Embodiment 5 provided by the present invention; Figure 7 This is a schematic diagram of the load correction curve in Embodiment 5 provided by the present invention.

[0056] Example 1

[0057] like Figure 1 As shown, an embodiment of the present invention provides a method for determining a load correction curve for a steam turbine generator set. The load correction curve is used to correct the operating parameters of the steam turbine generator set. By adjusting the operating parameters of the steam turbine generator set using the obtained load correction curve, the unit can be ensured to operate under optimal economic conditions. The method includes:

[0058] Step 1: Obtain the load value, steam pressure value, main steam temperature value, and reheat steam temperature value of the unit when the steam pressure after the regulating stage is within the preset range under different back pressure values, with the unit in a state of thermal system isolation and main steam regulating valve opening unchanged.

[0059] Specifically, in step one, before obtaining the parameters, the following is also included:

[0060] Step 101: In accordance with the requirements of the steam turbine performance test procedure, the steam turbine generator set is thermally isolated to ensure that the actual operating thermal system is consistent with the heat balance diagram;

[0061] Step 102: Select the unit load point to be tested (the unit load point can be the rated power generation load of the unit, or it can be determined according to the actual situation), and keep the unit load stable, the main steam regulating valve opening unchanged, and the steam pressure after the regulating stage stable. Record the current unit load value, the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value.

[0062] Step 103: Keep the main steam regulating valve opening unchanged, adjust the unit back pressure value (by gradually increasing or decreasing it), and adjust the boiler combustion to make the steam pressure value after the regulating stage as close as possible to the steam pressure value after the regulating stage mentioned above, so that the deviation is within the preset range (e.g., the deviation does not exceed 0.2MPa). After the unit has been running stably for 20-30 minutes, record the unit load value, the steam pressure value after the regulating stage, the main steam temperature value, the reheat steam temperature value, and other parameters.

[0063] Step 104: Repeat step 103 above to obtain no less than 3 sets of variable back pressure test data. The arithmetic mean of all test data is taken.

[0064] The steam pressure value after the regulating stage is the same as the pressure value after the speed stage, which is the steam pressure value measured after the steam is regulated by the turbine. As an impulse stage, the speed stage has a strong work capacity. Simply put, it can reduce the number of subsequent high-pressure blades, reduce the length of the high-pressure cylinder, save precious metals, and reduce costs. Generally, the speed stage is set in a double row.

[0065] Step 2: Based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value, correct the corresponding load value to obtain the corresponding load correction value;

[0066] Specifically, in step one, since at least three sets of variable back pressure test data were collected, the load value in each set of data needs to be corrected when correcting the load value. Therefore, for each load value, such as Figure 2 As shown, it includes:

[0067] Step 201: Correct the load value based on the corresponding regulating stage steam pressure value to obtain the first corrected load value corresponding to the load value;

[0068] Specifically, step 201 includes:

[0069] Step 2011: Calculate the average value of all collected steam pressure values ​​after the regulating stage. The following calculation formula is used for the calculation:

[0070]

[0071] Where Ptav is the average value of the steam pressure after all regulating stages; Pt1, ..., Ptm are the steam pressure values ​​after m regulating stages.

[0072] Step 2012: Using the average value as a reference value, calculate the steam pressure change rate of the steam pressure value after each regulating stage. Specifically, the following calculation formula is used:

[0073]

[0074] Where θj is the rate of change of steam pressure after the regulating stage; Ptj is the load value of the unit; Ptav is the average value of steam pressure after all regulating stages; j represents the test data of group 1-m.

[0075] Step 2013: Based on the first preset curve or the first preset table, determine the load change rate corresponding to each steam pressure change rate. The first preset curve or the first preset table is used to characterize the relationship between the steam pressure change rate of the steam pressure value after different regulation stages of the unit and the load change rate of the corresponding load value.

[0076] Specifically, the first preset curve or the first preset table is used to characterize the relationship between different steam pressure change rates of the unit and the corresponding load change rates, and it is obtained through the following steps:

[0077] First, based on the heat balance diagram of the steam turbine generator set, the theoretical load data of the unit corresponding to the theoretical steam pressure value after the regulating stage are obtained, as shown in Table 1 below:

[0078] Table 1. Relationship between theoretical steam pressure after regulating stage and theoretical load value of the unit.

[0079] 1 P1 L1 2 P2 L2 … … … n Pn Ln

[0080] Secondly, based on the data correspondence in Table 1, the theoretical steam pressure value P0 after the regulating stage corresponding to the unit load point L0 to be tested in step 102 is calculated using an interpolation algorithm.

[0081] Then, using the unit load point L0 and the corresponding theoretical steam pressure P0 after the regulating stage as the benchmark values, the load change rate αi of the unit theoretical load value corresponding to the steam pressure change rate θi of the theoretical steam pressure value after each regulating stage is calculated, resulting in the first preset table (the first preset curve can be fitted based on the data in the first preset table), as shown in Table 2 below. Specifically, the calculation is performed using the following formula:

[0082]

[0083]

[0084] Where θi is the steam pressure change rate of the theoretical steam pressure value after the regulating stage, %; Pi is the theoretical steam pressure value after the regulating stage, Pa; Li is the theoretical load value of the unit, Pa; αi is the load change rate of the theoretical load value of the unit, %; i represents the data in 1-n, that is, the change rate of 1-n groups is calculated.

[0085] Table 2. Relationship between the theoretical steam pressure change rate after regulating stage and the theoretical load change rate of the unit.

[0086] 1 θ1 α1 2 θ2 α2 … … … n θn αn

[0087] Finally, based on the data in Table 2, the load change rate αj of the unit corresponding to the steam pressure change rate θj after the regulating stage was calculated using an interpolation algorithm.

[0088] Step 2014: Based on the load change rate and the load value, obtain the corresponding first corrected load value, specifically calculated using the following formula:

[0089] Ltjc=Ltj×(1-αj / 100)

[0090] Where Ltjc is the first corrected load value after the steam pressure value is corrected after the regulating stage, in kW; Ltj is the load value of the unit in the j-th group of test data, in kW; j represents the test data of groups 1-m; αj is the load change rate of the unit in the j-th group of test data.

[0091] Step 202: Based on the corresponding main steam temperature value, correct the first corrected load corresponding to the load value to obtain the corresponding second corrected load value;

[0092] In this embodiment, step 202 specifically includes:

[0093] Step 2021: Based on the second preset curve or the second preset table, determine the first load correction coefficient corresponding to the main steam temperature value. The second preset curve or the second preset table is used to characterize the relationship between different main steam temperature values ​​of the unit and the corresponding first load correction coefficient.

[0094] The second preset curve or table is a correction curve or table provided by the turbine manufacturer regarding the relationship between the main steam temperature value and the unit's load value. Therefore, the first load correction factor is the correction factor used to adjust the unit load value corresponding to the main steam temperature value to the unit load value corresponding to the rated main steam temperature value. That is, the smaller the difference between the collected main steam temperature value and the rated main steam temperature value, the smaller the corresponding first load correction factor; the larger the difference between the collected main steam temperature value and the rated main steam temperature value, the larger the corresponding first load correction factor; if the collected main steam temperature value is equal to the rated main steam temperature value, then the first load correction factor is 0.

[0095] Step 2022: Based on the first load correction coefficient and the first corrected load value, obtain the corresponding second corrected load value.

[0096] Specifically, it is calculated using the following formula:

[0097] Ltjc1=Ltjc×(1+βj / 100)

[0098] Where Ltjc1 is the second corrected load value after correction for main steam temperature, in kW; Ltjc is the first corrected load value after correction for steam pressure after regulating stage, in kW; j represents the test data of group 1-m; βj is the first load correction coefficient corresponding to the main steam temperature value deviating from the rated value in the j-th test data.

[0099] Step 203: Based on the reheat steam temperature value, correct the second corrected load corresponding to the load value to obtain the corresponding load correction value.

[0100] In this embodiment, step 203 specifically includes:

[0101] Step 2031: Based on the third preset curve or the third preset table, determine the second load correction coefficient corresponding to the reheat steam temperature value. The third preset curve or the third preset table is used to characterize the relationship between different reheat steam temperature values ​​of the unit and the corresponding second load correction coefficient.

[0102] The third preset curve or table is a correction curve or table provided by the turbine manufacturer regarding the relationship between the reheat steam temperature value and the unit load value. Therefore, the second load correction factor is the correction factor that adjusts the unit load value corresponding to the reheat steam temperature value to the unit load value corresponding to the rated reheat steam temperature value. That is, the smaller the difference between the collected reheat steam temperature value and the rated reheat steam temperature value, the smaller the corresponding second load correction factor; the larger the difference between the collected reheat steam temperature value and the rated reheat steam temperature value, the larger the corresponding first load correction factor; if the collected reheat steam temperature value is equal to the rated reheat steam temperature value, then the second load correction factor is 0.

[0103] Step 2032: Based on the second load correction coefficient and the second corrected load value, obtain the corresponding load correction value.

[0104] Specifically, it is calculated using the following formula:

[0105] Ltjc2=Ltjc1×(1+εj / 100)

[0106] Where Ltjc2 is the load correction value after reheat steam temperature correction, in kW; Ltjc1 is the second corrected load value after main steam temperature correction, in kW; j represents the test data of groups 1-m; εj is the second load correction coefficient corresponding to the reheat steam temperature value deviating from the rated value in the j-th test data.

[0107] Through the above correction steps, the load correction values ​​corresponding to the load values ​​of the units in each group are finally obtained, as shown in Table 3 below, where Pb1 <Pb2<...<Pbm:

[0108] Table 3. Relationship between turbine back pressure value and corresponding load value and load correction value.

[0109] 1 Pb1 Lt1 Lt1c2 2 Pb2 Lt2 Lt2c2 … … … … m Pbm Ltm Ltmc2

[0110] Step 3: Using the load correction value corresponding to any one of the back pressure values ​​as the benchmark value, determine the load change rate for each load correction value;

[0111] Specifically, step three includes:

[0112] Using the load correction value corresponding to the minimum back pressure value as the benchmark, the corrected load change rate for each load correction value is calculated using the following formula:

[0113]

[0114] Where λj is the load change rate of the load correction value; Ltjc2 is the load correction value; and Lt1c2 is the load correction value corresponding to the minimum value among the back pressure values.

[0115] Step 4: Based on the back pressure value and the unit load change rate, determine the turbine generator unit load correction curve.

[0116] Specifically, in this embodiment, a graph is plotted with the back pressure value on the horizontal axis and the load change rate of the load correction value on the vertical axis, resulting in the following: Figure 3 The load correction curve for the steam turbine generator set is shown.

[0117] Example 2

[0118] A second aspect of the present invention provides an apparatus for determining a load correction curve for a steam turbine generator set, wherein the load correction curve is used to correct the operating parameters of the steam turbine generator set, such as... Figure 4 As shown, the device includes:

[0119] The parameter acquisition module 10 is used to acquire the load value, the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value of the unit when the unit is in a state of thermal system isolation and the main steam regulating valve opening is unchanged, under different back pressure values.

[0120] The load correction value determination module 20 is used to correct the corresponding load value based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value to obtain the corresponding load correction value.

[0121] The load change rate determination module 30 is used to determine the load change rate of each load correction value based on the load correction value corresponding to any end value of the back pressure value;

[0122] The load correction curve determination module 40 is used to obtain the turbine generator set load correction curve based on the back pressure value and the unit load change rate.

[0123] Optionally, the load correction value determination module 20 is specifically used for:

[0124] For each load value:

[0125] The load value is corrected based on the corresponding regulating stage steam pressure value to obtain the load value for...

[0126] The first corrected load value should be;

[0127] Based on the corresponding main steam temperature value, the first corrected load value corresponding to the load value is corrected to obtain the corresponding second corrected load value;

[0128] The second corrected load value corresponding to the load value is corrected based on the reheat steam temperature value to obtain the corresponding load correction value.

[0129] Example 3

[0130] A third aspect of the present invention provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for determining the load correction curve of a steam turbine generator set.

[0131] Example 4

[0132] A fourth aspect of the present invention provides a readable storage medium storing instructions for causing a machine to perform the aforementioned method for determining the load correction curve of a steam turbine generator set.

[0133] Example 5

[0134] In this embodiment, a steam turbine generator unit of a thermal power plant is used as a 330MW subcritical unit. A variable back pressure test is conducted at a 300MW load point. During the test, parameters such as unit load, back pressure, steam pressure after the regulating stage, main steam temperature, and reheat steam temperature are collected online. The arithmetic mean of the data collected during the test is taken. Three sets of variable back pressure test data are shown in Table 4 below:

[0135] Table 4. Test data of variable back pressure test

[0136] Unit load kW 300897.70 295184.99 287262.42 back pressure kPa 7.57 9.80 11.99 Steam pressure after regulating stage MPa 13.18 13.16 13.13 Main steam temperature ℃ 542.82 545.20 544.17 Reheat steam temperature ℃ 538.43 538.74 536.89

[0137] The method described in this scheme is used to correct the load values ​​of these three sets of variable back pressure test data, including:

[0138] 1. Obtain the unit load value corresponding to the steam pressure value after different regulating stages according to the turbine design heat balance diagram, and convert it into two columns of data: the load change rate corresponding to the pressure change rate of the steam pressure value after the regulating stage. The first preset curve is obtained, as shown in Tables 5 and 6 below:

[0139] Table 5. Relationship between unit load values ​​corresponding to steam pressure values ​​after regulating stage.

[0140] — MPa kW 1 13.2 320000 2 12.4 300000 3 10 250000

[0141] Table 6. Relationship between the rate of change of steam pressure after regulating stage and the rate of change of unit load.

[0142] 1 6.4516 6.6667 2 0.0000 0.0000 3 -19.3548 -16.6667

[0143] 2. First, based on the first preset curve (the relationship curve between pressure change rate and load change rate), correct the steam pressure after the regulating stage in each group of variable back pressure test data to the unit load corresponding to an average load value of 13.16 MPa. Second, based on the data provided by the turbine manufacturer, such as... Figure 5 The second preset curve shown (the correction curve of main steam temperature value to unit load value) corrects the main steam temperature value in each group of variable back pressure test data to the unit load corresponding to the rated main steam temperature of 540℃; then, according to the data provided by the turbine manufacturer, such as... Figure 6 The third preset curve shown (the correction curve of reheat steam temperature value to unit load value) corrects the reheat steam temperature value in each group of variable back pressure test data to the unit load corresponding to the rated reheat steam temperature value of 540℃.

[0144] The load values ​​are corrected by using the steam pressure, main steam temperature, and reheat steam temperature values ​​after the regulating stage, as shown in Table 7 below:

[0145] Table 7 shows the relationship between back pressure values ​​and corresponding load values ​​and load correction values.

[0146]

[0147]

[0148] 3. Among the various sets of back pressure test data, the set with the lowest turbine back pressure (7.57 kPa) was used as the baseline. The corrected unit load change rate was calculated for each set, as shown in Table 8 below, which displays the relationship between different back pressure values ​​and the unit load change rate. Based on the data in Table 8, a correction curve was plotted, as shown below. Figure 7 The load correction curve for the steam turbine generator set is shown.

[0149] Table 8. Relationship between unit load change rate for different back pressure values.

[0150] — kPa ％ 1 7.57 0.00 2 9.80 -1.74 3 11.99 -4.28

[0151] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0152] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application.

[0153] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0154] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A method for determining a load correction curve for a steam turbine generator set, wherein the load correction curve is used to correct the operating parameters of the steam turbine generator set, characterized in that, The method includes: Under the conditions of thermal system isolation and constant main steam valve opening, the load value, the steam pressure value after the regulating stage of the unit is within the preset range under different back pressure values, the main steam temperature value and the reheat steam temperature value are obtained. The corresponding load value is corrected based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value to obtain the corresponding load correction value; Using the load correction value corresponding to any one of the back pressure values ​​as a reference value, determine the load change rate for each load correction value; Based on the back pressure value and the load change rate, determine the load correction curve of the steam turbine generator set; Specifically, the load value is corrected based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value to obtain the corresponding load correction value, including: For each load value: The load value is corrected based on the corresponding steam pressure value after the regulating stage to obtain the first corrected load value corresponding to the load value. Based on the corresponding main steam temperature value, the first corrected load value corresponding to the load value is corrected to obtain the corresponding second corrected load value; Based on the reheat steam temperature value, the second corrected load value corresponding to the load value is corrected to obtain the corresponding load correction value; The load value is corrected based on the corresponding regulating stage steam pressure value to obtain the first corrected load value, including: Calculate the average steam pressure value after all regulating stages; Using the average value as a reference value, the steam pressure change rate of the steam pressure value after each regulation stage is calculated; Based on the first preset curve or the first preset table, the load change rate corresponding to each steam pressure change rate is determined. The first preset curve or the first preset table is used to characterize the relationship between the steam pressure change rate of the steam pressure value after different regulation stages of the unit and the load change rate of the corresponding load value. Based on the load change rate and the load value, the corresponding first corrected load value is obtained.

2. The method according to claim 1, characterized in that, Based on the corresponding main steam temperature value, the first corrected load value corresponding to this load value is corrected to obtain the corresponding second corrected load value, including: Based on the second preset curve or the second preset table, the first load correction coefficient corresponding to the main steam temperature value is determined. The second preset curve or the second preset table is used to characterize the relationship between different main steam temperature values ​​of the unit and the corresponding first load correction coefficient. Based on the first load correction factor and the first corrected load value, the corresponding second corrected load value is obtained.

3. The method according to claim 1, characterized in that, Based on the reheat steam temperature value, the second corrected load value corresponding to the load value is corrected to obtain the corresponding load correction value, including: Based on the third preset curve or the third preset table, the second load correction coefficient corresponding to the reheat steam temperature value is determined. The third preset curve or the third preset table are used to characterize the relationship between different reheat steam temperature values ​​of the unit and the corresponding second load correction coefficient. Based on the second load correction factor and the second corrected load value, the corresponding load correction value is obtained.

4. The method according to claim 1, characterized in that, Using the load correction value corresponding to any one of the back pressure values ​​as a reference value, determine the load change rate for each load correction value, including: Using the load correction value corresponding to the minimum back pressure value as the benchmark value, the load change rate of each load correction value is calculated.

5. A device for determining the load correction curve of a steam turbine generator set, characterized in that, The turbine generator set load correction curve is used to correct the operating parameters of the turbine generator set, characterized in that the device includes: The parameter acquisition module is used to acquire the load value, the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value of the unit when the back pressure value is within the preset range under different back pressure values, with the thermal system isolated and the main steam regulating valve opening unchanged. The load correction value determination module is used to correct the corresponding load value based on the steam pressure value after the regulating stage, the main steam temperature value, and the reheat steam temperature value to obtain the corresponding load correction value. The load change rate determination module is used to determine the load change rate of each load correction value based on the load correction value corresponding to any end value of the back pressure value. The load correction curve determination module is used to determine the load correction curve of the steam turbine generator set based on the back pressure value and the load change rate. The load correction value determination module is specifically used for: For each load value: The load value is corrected based on the corresponding steam pressure value after the regulating stage to obtain the first corrected load value corresponding to the load value. Based on the corresponding main steam temperature value, the first corrected load value corresponding to the load value is corrected to obtain the corresponding second corrected load value; Based on the reheat steam temperature value, the second corrected load value corresponding to the load value is corrected to obtain the corresponding load correction value; The load value is corrected based on the corresponding regulating stage steam pressure value to obtain the first corrected load value, including: Calculate the average steam pressure value after all regulating stages; Using the average value as a reference value, the steam pressure change rate of the steam pressure value after each regulation stage is calculated; Based on the first preset curve or the first preset table, the load change rate corresponding to each steam pressure change rate is determined. The first preset curve or the first preset table is used to characterize the relationship between the steam pressure change rate of the steam pressure value after different regulation stages of the unit and the load change rate of the corresponding load value. Based on the load change rate and the load value, the corresponding first corrected load value is obtained.

6. An electronic 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 method for determining the load correction curve of the steam turbine generator set as described in any one of claims 1-4.

7. A readable storage medium storing instructions for causing a machine to perform the method for determining the load correction curve of a steam turbine generator set as described in any one of claims 1-4.

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