Method, device and equipment for calculating power and heat rate of steam turbine generator unit and medium

Abstract

The application provides a steam turbine generator unit power and heat rate calculation method, device, equipment and medium, and belongs to the technical field of steam turbines. The method is based on the principle that the influence of back pressure change on the steam turbine itself is reflected on the change of low-pressure cylinder work amount, converts the correction coefficient of back pressure on power in the pure condensation condition into the correction coefficient of back pressure on power in the heat supply condition, then separates the low-pressure cylinder output of the steam extraction heat supply condition and corrects it, obtains the influence amount of back pressure change on the power of the steam turbine generator unit in the heat supply condition, and finally further obtains the influence amount of back pressure change on the heat rate through the inverse relationship between the power change and the heat rate change of the steam turbine generator unit. The application can accurately calculate the power and heat rate of the steam turbine generator unit in the heat supply condition, so that the user can judge the operation economy of the steam turbine generator unit in the heat supply condition.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, specifically to a method for calculating the power and heat rate of a steam turbine generator set, a device for calculating the power and heat rate of a steam turbine generator set, an electronic device, and a computationally readable storage medium. Background Technology

[0002] In recent years, with increasing environmental protection pressures in various countries, reducing carbon dioxide emissions and improving energy efficiency have become global concerns. Advanced and efficient steam turbine extraction for heating in thermal power plants has been recognized worldwide as an important means to improve energy efficiency and achieve energy conservation and emission reduction. Therefore, an increasing number of condensing units are being converted into heating units to meet the needs of local industrial heat users.

[0003] In actual operation, the initial and final parameters of steam turbine generator sets inevitably deviate from the design parameters. Both theoretical derivation and practical engineering applications demonstrate that back pressure variation is one of the most significant parameters affecting the unit's operational economy. Therefore, accurately determining the impact of back pressure variation on the operational economy of steam turbine generator sets is of great practical significance for comparing the economic performance of different types of units and for optimizing unit operation. Generally, for pure condensing units, the impact on the power and heat rate of the steam turbine generator set can be determined using the back pressure correction curve provided by the turbine manufacturer.

[0004] However, since the low-pressure cylinder's work ratio in heating operation is significantly lower than that in pure condensing operation, and the low-pressure cylinder's work ratio changes with the amount of steam extracted for heating, the above judgment method is only applicable to pure condensing operation and not to heating operation. Therefore, it is impossible to determine the impact of back pressure changes on the unit's operating economy under heating operation. Summary of the Invention

[0005] The purpose of this invention is to provide a method, apparatus, equipment, and medium for calculating the power and heat rate of a steam turbine generator set, in order to solve the problem of being unable to determine the economic efficiency of the steam turbine generator set under heating conditions.

[0006] To achieve the above objectives, embodiments of the present invention provide a method for calculating the power and heat rate of a steam turbine generator set, including:

[0007] The power of the steam turbine generator set and the power of the low-pressure cylinder corresponding to the heating and pure condensing conditions are obtained respectively, as well as the heat consumption rate of the steam turbine generator set under the heating condition.

[0008] Based on the turbine generator set power under the pure condensing condition and the correction coefficient of the turbine generator set power to the preset back pressure change, the change value of the turbine generator set power after the back pressure change under the pure condensing condition is obtained.

[0009] Based on the change value of the turbine generator set after the back pressure change under the pure condensing condition and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under the pure condensing condition, the change coefficient of the power of the turbine generator set corresponding to the work done by the low-pressure cylinder is obtained.

[0010] Based on the variation coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator corresponding to the work done by the low-pressure cylinder under heating conditions, the change value of the turbine generator power after the back pressure change under heating conditions is obtained.

[0011] Based on the change in the power of the steam turbine generator set after the back pressure change under the heating condition and the power of the steam turbine generator set under the heating condition, the power of the steam turbine generator set after the back pressure change under the heating condition is obtained.

[0012] Based on the change in power of the turbine generator set after the back pressure change under the heating condition, the power of the turbine generator set after the back pressure change under the heating condition, and the heat consumption rate of the turbine generator set under the heating condition, the heat consumption rate of the turbine generator set after the back pressure change under the heating condition is obtained.

[0013] Optionally, the step of obtaining the change in turbine generator power under pure condensing conditions based on the turbine generator power under the pure condensing condition and the correction coefficient for the turbine generator power under the preset back pressure change includes:

[0014] Using formula (1), the power of the steam turbine generator set under the pure condensing condition and the correction coefficient of the steam turbine generator set power due to the change of the preset back pressure are calculated to obtain the change value of the steam turbine generator set power after the change of the back pressure under the pure condensing condition.

[0015] ΔW=W e ×θ e / 100 (1);

[0016] Where ΔW represents the change in power of the turbine generator unit after the back pressure change under pure condensing conditions; W e θ represents the power output of the steam turbine generator unit under pure condensing conditions. e This represents the correction factor for the power output of the turbine generator set due to changes in the preset back pressure.

[0017] Optionally, the step of obtaining the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder based on the change value of the turbine generator unit after the back pressure change under the pure condensing condition and the turbine generator unit power corresponding to the work done by the low-pressure cylinder under the pure condensing condition includes:

[0018] Using formula (2), the change value of the turbine generator power after the back pressure change under the pure condensing condition and the turbine generator power corresponding to the work done by the low-pressure cylinder under the pure condensing condition are calculated to obtain the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder.

[0019]

[0020] Where, θ LP-e ΔW represents the power variation coefficient of the turbine generator set corresponding to the work done by the low-pressure cylinder; ΔW represents the power variation of the turbine generator set after the back pressure change under pure condensing conditions; W LP-e This indicates the turbine generator set power corresponding to the work done by the low-pressure cylinder under pure condensing conditions.

[0021] Optionally, obtaining the change value of the turbine generator set power under heating conditions based on the change coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder and the turbine generator set power corresponding to the work done by the low-pressure cylinder under heating conditions includes:

[0022] Using formula (3), the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator corresponding to the work done by the low-pressure cylinder under the heating condition are calculated to obtain the change value of the turbine generator power after the back pressure change under the heating condition.

[0023]

[0024] Wherein, ΔW gr This represents the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions. θ represents the turbine generator set power corresponding to the work done by the low-pressure cylinder under heating conditions; LP-e This represents the coefficient of variation of the turbine generator set power corresponding to the work done by the low-pressure cylinder.

[0025] Optionally, obtaining the turbine generator set power under the heating condition based on the change in turbine generator set power under the back pressure change and the turbine generator set power under the heating condition includes:

[0026] Using formula (4), the change in the power of the steam turbine generator set after the change in back pressure under the heating condition and the power of the steam turbine generator set under the heating condition are calculated to obtain the power of the steam turbine generator set after the change in back pressure under the heating condition.

[0027]

[0028] in, This indicates the power output of the steam turbine generator set after the back pressure changes under heating conditions. This indicates the power output of the steam turbine generator set under heating conditions; ΔW gr This indicates the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions.

[0029] Optionally, obtaining the heat rate of the turbine generator set after the back pressure change under the heating condition based on the change in the turbine generator set power after the back pressure change under the heating condition, the turbine generator set power after the back pressure change under the heating condition, and the heat rate of the turbine generator set under the heating condition includes:

[0030] Using formula (5), the change in power of the steam turbine generator set after the change in back pressure under the heating condition, the power of the steam turbine generator set under the heating condition, and the heat consumption rate of the steam turbine generator set under the heating condition are calculated to obtain the heat consumption rate of the steam turbine generator set after the change in back pressure under the heating condition.

[0031]

[0032] in, This indicates the heat consumption rate of the steam turbine generator set after the back pressure changes under heating conditions; This indicates the heat consumption rate of the steam turbine generator set under heating conditions; This indicates the power output of the steam turbine generator set under heating conditions.

[0033] Optionally, the correction factor for the power output of the turbine generator set due to the preset back pressure change is obtained in the following way:

[0034] Obtain the back pressure of the extraction unit under pure condensation conditions;

[0035] Based on the preset back pressure correction curve for pure condensing operation and the back pressure of the extraction turbine under pure condensing operation, the correction coefficient of the preset back pressure change on the power of the turbine generator set is obtained.

[0036] In a second aspect of the present invention, a device for calculating the power and heat rate of a steam turbine generator set is provided, comprising:

[0037] The data acquisition module is used to acquire the power of the steam turbine generator set and the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder under heating and pure condensing conditions, respectively, as well as the heat consumption rate of the steam turbine generator set under heating conditions.

[0038] The first power calculation module is used to obtain the change value of the turbine generator set power after the back pressure change under the pure condensing condition based on the turbine generator set power under the pure condensing condition and the correction coefficient of the turbine generator set power under the preset back pressure change.

[0039] The coefficient calculation module is used to obtain the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder based on the change value of the turbine generator set after the back pressure change under the pure condensing condition and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under the pure condensing condition.

[0040] The second power calculation module is used to obtain the change value of the turbine generator set power after the back pressure change under the heating condition based on the change coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under the heating condition.

[0041] The power correction module is used to obtain the power of the turbine generator set after the back pressure change under the heating condition based on the change value of the power of the turbine generator set after the back pressure change under the heating condition and the power of the turbine generator set under the heating condition.

[0042] The heat rate correction module is used to obtain the heat rate of the turbine generator set under the heating condition based on the change in power of the turbine generator set after the back pressure change, the power of the turbine generator set after the back pressure change, and the heat rate of the turbine generator set under the heating condition.

[0043] In a third aspect of the present invention, an electronic device is provided, characterized in that it includes: a processor and a memory, the memory storing machine-readable instructions executable by the processor, wherein the machine-readable instructions, when executed by the processor, perform the above-described method for calculating the power and heat rate of a steam turbine generator set.

[0044] In a fourth aspect of the present invention, a computer-readable storage medium is provided, storing computer instructions, characterized in that, when the computer instructions are executed on a computer, the computer causes the computer to execute the above-described method for calculating the power and heat rate of a steam turbine generator set.

[0045] In this embodiment of the invention, based on the principle that the impact of back pressure change on the turbine itself is reflected in the change of work done in the low-pressure cylinder, the correction coefficient of back pressure on power under pure condensing conditions is converted into the correction coefficient of back pressure on power under heating conditions. Then, the output of the low-pressure cylinder under extraction heating conditions is separated and corrected, thus obtaining the influence of back pressure change on the power of the turbine generator set under heating conditions. Finally, based on the inverse relationship between the change in power of the turbine generator set and the change in heat rate, the influence of back pressure change on heat rate is further obtained. This enables accurate calculation of the power and heat rate of the turbine generator set under heating conditions, allowing users to determine the impact of back pressure change on the economic operation of the unit under heating conditions.

[0046] 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

[0047] 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:

[0048] Figure 1 A flowchart illustrating the method for calculating the power and heat rate of a steam turbine generator set provided in an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the structure of a steam turbine generator set provided in an embodiment of the present invention;

[0050] Figure 3 A schematic diagram of the structure of the steam turbine generator set power and heat rate calculation device provided in an embodiment of the present invention;

[0051] Figure 4 A schematic diagram showing the relationship between back pressure and back pressure variation on the power correction coefficient of the steam turbine generator set;

[0052] Figure 5 This diagram illustrates the relationship between back pressure variation and the correction coefficient for the heat rate of a steam turbine generator set under different operating conditions. 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 scope of the present invention.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] Before introducing the present invention, the principles of the present invention will be explained:

[0057] When the turbine generator set operates under sliding pressure, the regulating valve opening remains constant, and the flow area and relative internal efficiency of the regulating stage remain essentially unchanged. The impact of back pressure changes on the turbine generator set is mainly reflected in the relative internal efficiency of the final stage and the change in the low-pressure heater extraction steam rate caused by the change in condensate temperature due to back pressure changes, thus affecting the economic efficiency of the turbine generator operation. Extensive practical experience shows that changes in the relative internal efficiency of the final stage and the low-pressure heater extraction steam rate both affect the amount of work done by the low-pressure cylinder in the entire turbine, while the work done by the high-pressure and intermediate-pressure cylinders can be ignored.

[0058] Therefore, based on the principle that the work done by the low-pressure cylinder can characterize the impact of back pressure changes on the turbine generator set, and then according to the power of the turbine generator set under pure condensing conditions and the correction coefficient for the generator power caused by back pressure changes under pure condensing conditions, the change value of the turbine generator set power after back pressure changes under pure condensing conditions is calculated. Then, the ratio of the change value of the turbine generator set power after back pressure changes under pure condensing conditions to the change coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder is calculated. This ratio characterizes the influence law of back pressure changes on the turbine generator set power corresponding to the work done by the low-pressure cylinder. Based on this law, the generator power corresponding to the work done by the low-pressure cylinder under heating conditions is calculated to obtain the change value of the turbine generator set power after back pressure changes under heating conditions. Finally, the change value of the turbine generator set power after back pressure changes under heating conditions is used to correct the power of the turbine generator set under heating conditions to obtain the power of the turbine generator set under heating conditions with corrected back pressure.

[0059] Please refer to Figure 1 , Figure 1 A flowchart illustrating the method for calculating the power and heat rate of a steam turbine generator set provided in an embodiment of the present invention. The method includes the following steps:

[0060] S100, respectively obtains the power of the steam turbine generator set and the power of the low-pressure cylinder under heating and pure condensing conditions, as well as the heat consumption rate of the steam turbine generator set under heating conditions.

[0061] To facilitate a better understanding of the concept of this invention, a structural schematic diagram of a steam turbine generator set is provided below. Figure 2 As shown, the steam turbine generator set includes: a high-pressure cylinder, a low-pressure cylinder, an intermediate-pressure cylinder, and a generator. Additionally... Figure 2 The steam flow direction in the high-pressure, intermediate-pressure, and low-pressure cylinders is also shown. This can be referenced in subsequent calculations. Figure 2 Perform a combined analysis.

[0062] Understandably, steam turbine generator sets operate under different conditions, including pure condensing and heating conditions. Each condition presents a series of thermodynamic performance parameters, including but not limited to: steam turbine generator set power, steam turbine generator set power corresponding to the work done in the low-pressure cylinder, and heat rate.

[0063] S200, based on the power of the steam turbine generator set under pure condensing conditions and the correction coefficient of the preset back pressure change on the power of the steam turbine generator set, obtains the change value of the power of the steam turbine generator set after the back pressure change under pure condensing conditions.

[0064] The preset back pressure change correction factor for turbine generator power refers to the impact of back pressure change on turbine generator power. For example, if the reference back pressure (design back pressure) is 5.88 kPa and the actual operating back pressure is 7.85 kPa, then according to the correction curve of back pressure on generator power under pure condensing conditions, the generator power correction factor corresponding to 7.85 kPa is -1.92%. That is to say, after the back pressure increases from 5.88 to 7.85, the generator power will decrease by 1.92 percentage points.

[0065] S300, based on the change value of the turbine generator set after the back pressure change under pure condensing condition and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under pure condensing condition, the change coefficient of the power of the turbine generator set corresponding to the work done by the low-pressure cylinder is obtained.

[0066] S400, based on the variation coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator corresponding to the work done by the low-pressure cylinder under heating conditions, the change value of the turbine generator power after the back pressure change under heating conditions is obtained.

[0067] In one embodiment, the turbine generator set power corresponding to the work done by the low-pressure cylinder under pure condensing and heating conditions can be calculated in the following way:

[0068] The following explanation uses the calculation process of the turbine generator power corresponding to the work done by the low-pressure cylinder under pure condensing conditions as an example. The calculation process of the turbine generator power corresponding to the work done by the low-pressure cylinder under heating conditions is the same as that under pure condensing conditions, and will not be repeated here.

[0069] I. Calculate the steam flow rate of each stage in the high-pressure and intermediate-pressure cylinders of the steam turbine unit:

[0070] (1) Using formula M z-t =M z -M hm The main steam flow rate and high-pressure valve leakage under pure condensing conditions are calculated to obtain the steam flow rate of the main steam to the regulating stage under pure condensing conditions.

[0071] (2) Using formula M t-1 =M z-t -M gq The steam flow rate from the main steam to the regulating stage and the steam leakage from the regulating stage to the intermediate pressure cylinder under pure condensing conditions are calculated to obtain the steam flow rate from the regulating stage to the first stage extraction steam.

[0072] (3) Using formula M 1-g =M t-1 -M1 calculates the steam flow rate from the regulating stage to the first stage extraction and the first stage extraction under pure condensing conditions, and obtains the steam flow rate from the first stage extraction to the high-pressure cylinder exhaust under pure condensing conditions.

[0073] (4) Using formula M zr-3 =M zr -M im +M gq The reheat steam flow rate, intermediate pressure valve stem leakage, and regulating stage leakage to intermediate pressure cylinder under pure condensing conditions are calculated to obtain the reheat steam flow rate to the third stage extraction steam under pure condensing conditions.

[0074] (5) Using formula M 3-ip =M zr-3 -M3 calculates the steam flow rate from reheat steam to the third stage extraction steam and the third stage extraction steam flow rate under pure condensing conditions, and obtains the steam flow rate from the third stage extraction steam to the intermediate pressure cylinder exhaust steam under pure condensing conditions.

[0075] II. Calculate the work done by steam in each stage of the high- and intermediate-pressure cylinders of the steam turbine:

[0076] (6) Using formula W z-t =M z-t ×(H z -H t ) / 3.6, calculate the main steam flow rate, main steam enthalpy and regulating stage enthalpy of the steam turbine under pure condensing conditions, and obtain the work done by the main steam after reaching the regulating stage under pure condensing conditions;

[0077] (7) Using formula W t-1 =M t-1 ×(H t -H1) / 3.6, calculate the steam flow rate, enthalpy of the regulating stage and the enthalpy of the first extraction stage under pure condensing conditions, and obtain the work done by the regulating stage to the first extraction stage under pure condensing conditions.

[0078] (8) Using formula W 1-g =M 1-g ×(H1-H g ) / 3.6, calculate the steam flow rate, enthalpy of the first extraction steam and the enthalpy of the high-pressure cylinder exhaust steam under pure condensing conditions, and obtain the work done by the first extraction steam to the high-pressure cylinder exhaust steam.

[0079] (9) Using formula W zr-3 =M zr-3 ×(H zr -H3) / 3.6, calculate the steam flow rate, reheat steam enthalpy and third-stage extraction enthalpy of reheat steam under pure condensing conditions, and obtain the work done by reheat steam to third-stage extraction under pure condensing conditions.

[0080] (10) Using formula W 3-ip =M 3-ip ×(H3-H ip ) / 3.6, calculate the steam flow rate, enthalpy of the three-stage extraction and the enthalpy of the intermediate-pressure cylinder exhaust under pure condensing conditions, and obtain the work done by the three-stage extraction to the intermediate-pressure cylinder exhaust under pure condensing conditions.

[0081] 3. Calculate the work done by the high-pressure, intermediate-pressure, and low-pressure cylinders of the steam turbine separately, and convert the work done by the low-pressure cylinder into the corresponding generator power:

[0082] (11) Using formula W HP =W z-t +W t-1 +W 1-g The work done by the main steam to the regulating stage, the work done by the regulating stage to the first stage extraction steam, and the work done by the first stage extraction steam to the high-pressure cylinder exhaust steam under pure condensing conditions are calculated to obtain the work done by the high-pressure cylinder under pure condensing conditions.

[0083] (12) Using formula W IP =W zr-3 +W 3-ip The work done by reheat steam to the third stage extraction and the work done by the third stage extraction to the intermediate pressure cylinder exhaust under pure condensing conditions are calculated to obtain the work done by the intermediate pressure cylinder under pure condensing conditions.

[0084] (13) Using formula W LP =W e / (η m ·η e )-W HP -W IP The work done by the high-pressure cylinder, the work done by the intermediate-pressure cylinder, the power of the steam turbine generator set, the efficiency of the steam turbine generator set, and the mechanical efficiency of the steam turbine generator set under pure condensing conditions are calculated to obtain the work done by the low-pressure cylinder under pure condensing conditions.

[0085] (14) Using formula W LP-e =W LP ×η m ×η eThe power output of the low-pressure cylinder, as well as the power, efficiency, and mechanical efficiency of the turbine generator set under pure condensing conditions, are calculated to obtain the power output of the turbine generator set corresponding to the power output of the low-pressure cylinder under pure condensing conditions.

[0086] Among them, W LP W represents the work done by the low-pressure cylinder under pure condensation conditions. e Indicates the power output of the steam turbine generator set under pure condensing conditions; η m η represents the mechanical efficiency of a steam turbine generator set under pure condensing conditions. e W represents the efficiency of a steam turbine generator set under pure condensing conditions. HP W represents the work done by the high-pressure cylinder under pure condensation conditions. IP W represents the work done by the intermediate-pressure cylinder under pure condensation conditions. LP-e This indicates the turbine generator set power corresponding to the work done by the low-pressure cylinder under pure condensing conditions; W z-t W represents the amount of work done by the main steam after it reaches the regulating stage under pure condensing conditions. t-1 This indicates the work done by the regulating stage to the first stage of steam extraction under pure condensing conditions; W 1-g This indicates the amount of work done in a section of steam extraction to the high-pressure cylinder exhaust; W zr-3 W represents the work done by reheat steam to the third stage extraction under pure condensing conditions; 3-ip This indicates the work done by the three-stage extraction steam to the intermediate-pressure cylinder exhaust under pure condensing conditions; M z-t H represents the main steam flow rate of the turbine under pure condensing conditions; z H represents the enthalpy of the main steam under pure condensation conditions. t M represents the enthalpy of the regulating stage under pure condensation conditions; t-1 H1 represents the steam flow rate from the regulating stage to the first extraction stage under pure condensing conditions; M represents the enthalpy of the first extraction stage under pure condensing conditions; 1-g H represents the steam flow rate from the extraction point to the high-pressure cylinder exhaust point; g Indicates the enthalpy of high-pressure cylinder exhaust; M zr-3 H represents the steam flow rate from reheat steam to the third-stage extraction steam under pure condensing conditions; zr H3 represents the enthalpy of reheat steam under pure condensing conditions; M represents the enthalpy of three-stage extraction steam under pure condensing conditions. 3-ip H represents the steam flow rate from the three-stage extraction to the intermediate-pressure cylinder exhaust under pure condensing conditions; ip M represents the enthalpy of the intermediate-pressure cylinder exhaust steam under pure condensation conditions; z M represents the main steam flow rate under pure condensing conditions; hm M represents the steam leakage of the high-pressure gantry under pure condensing conditions; z-t M represents the steam flow rate from the main steam to the regulating stage under pure condensing conditions; gq Indicates the flow rate of steam leakage from the regulating stage to the intermediate pressure cylinder under pure condensing conditions; M t-1M1 represents the steam flow rate from the regulating stage to the first stage extraction steam under pure condensing conditions; M represents the first stage extraction steam flow rate under pure condensing conditions; M zr M represents the reheat steam flow rate under pure condensation conditions; im M3 indicates the steam leakage of the medium-pressure valve under pure condensing conditions; M3 indicates the three-stage extraction steam flow rate under pure condensing conditions.

[0087] S500, based on the change in the power of the steam turbine generator set after the change in back pressure under heating conditions and the power of the steam turbine generator set under heating conditions, obtains the power of the steam turbine generator set after the change in back pressure under heating conditions.

[0088] S600, based on the change in power of the turbine generator set after the change in back pressure under heating conditions, the power of the turbine generator set after the change in back pressure under heating conditions, and the heat consumption rate of the turbine generator set under heating conditions, obtains the heat consumption rate of the turbine generator set after the change in back pressure under heating conditions.

[0089] It should be noted that the change in power output of a steam turbine generator set is inversely proportional to the change in heat rate.

[0090] In this embodiment of the invention, based on the principle that the impact of back pressure change on the turbine itself is reflected in the change of work done in the low-pressure cylinder, the correction coefficient of back pressure on power under pure condensing conditions is converted into the correction coefficient of back pressure on power under heating conditions. Then, the output of the low-pressure cylinder under extraction heating conditions is separated and corrected, thus obtaining the influence of back pressure change on the power of the turbine generator set under heating conditions. Finally, based on the inverse relationship between the power change of the turbine generator set and the heat rate change, the influence of back pressure change on the heat rate is further obtained. This enables accurate calculation of the power and heat rate of the turbine generator set under heating conditions, allowing users to judge the economic efficiency of the turbine generator set under heating conditions.

[0091] Optionally, step S200 may further include the following steps:

[0092] Using formula (1), the power of the steam turbine generator set under pure condensing conditions and the correction coefficient of the steam turbine generator set power under the preset back pressure change are calculated to obtain the change value of the steam turbine generator set power after the back pressure change under pure condensing conditions.

[0093] ΔW=W e ×θ e / 100 (1);

[0094] Where ΔW represents the change in power of the turbine generator unit after the back pressure change under pure condensing conditions; W e θ represents the power output of the steam turbine generator unit under pure condensing conditions. e This represents the correction factor for the power output of the turbine generator set due to changes in the preset back pressure.

[0095] To make it easier to understand, the following examples are provided:

[0096] Assuming the power of the steam turbine generator set under pure condensing conditions is 660014kW, and the preset correction coefficient for the back pressure change on the power of the steam turbine generator set is -1.92, then substituting into formula (1) for calculation: 660014*(-1.92 / 100)=-12672.27kW, the calculated change in the power of the steam turbine generator set after the back pressure change under pure condensing conditions is -12672.27kW. That is, under pure condensing conditions, the power of the steam turbine generator set decreases by 12672.27kW due to the increase in back pressure.

[0097] In this embodiment, by using formula (1) to calculate the correction coefficient of the turbine generator set power and back pressure change under pure condensing conditions, the change value of the turbine generator set power after the back pressure change under pure condensing conditions can be accurately calculated.

[0098] Optionally, step S300 may further include the following steps:

[0099] Using formula (2), the change value of the turbine generator power after the back pressure change under pure condensing conditions and the turbine generator power corresponding to the work done by the low-pressure cylinder under pure condensing conditions are calculated to obtain the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder.

[0100]

[0101] Where, θ LP-e ΔW represents the power variation coefficient of the turbine generator set corresponding to the work done by the low-pressure cylinder; ΔW represents the power variation of the turbine generator set after the back pressure change under pure condensing conditions; W LP-e This indicates the turbine generator set power corresponding to the work done by the low-pressure cylinder under pure condensing conditions.

[0102] To make it easier to understand, the following examples are provided:

[0103] Assuming the change in turbine generator power under pure condensing conditions due to back pressure variation is -12672.27 kW, and the turbine generator power corresponding to the low-pressure cylinder work under pure condensing conditions is 307052.34 kW, substituting into formula (2) for calculation: -12672.27 / 307052.34*100=-4.13%, the change coefficient of turbine generator power corresponding to low-pressure cylinder work is calculated to be -4.13%. That is, under heating conditions, the correction coefficient of back pressure on turbine generator power is -4.13%.

[0104] In this embodiment, by using formula (2) to calculate the change value of the turbine generator power after the back pressure change under pure condensing conditions and the turbine generator power corresponding to the work done by the low-pressure cylinder, the change coefficient of the generator power after the back pressure change relative to the generator power corresponding to the work done by the low-pressure cylinder can be accurately calculated.

[0105] Optionally, step S400 may further include the following steps:

[0106] Using formula (3), the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator corresponding to the work done by the low-pressure cylinder under heating conditions are calculated to obtain the change value of the turbine generator power after the back pressure change under heating conditions.

[0107]

[0108] Wherein, ΔW gr This represents the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions. θ represents the turbine generator set power corresponding to the work done by the low-pressure cylinder under heating conditions; LP-e This represents the coefficient of variation of the turbine generator set power corresponding to the work done by the low-pressure cylinder.

[0109] In this embodiment, the following examples illustrate the point:

[0110] Assuming the power output of the turbine generator set corresponding to the low-pressure cylinder under heating conditions is 221161.04 kW, and the coefficient of change of the turbine generator set power output corresponding to the low-pressure cylinder is -4.13%, then substituting into formula (3) for calculation: 221161.04 * (-4.13 / 100) = -9127.47 kW, the calculated change in power output of the turbine generator set after the change in back pressure under heating conditions is -9127.47 kW. That is, under heating conditions, the power output of the turbine generator set decreases by 9127.47 kW due to the increase in back pressure.

[0111] In this embodiment, by using formula (3) to calculate the change coefficient of the generator power corresponding to the work done by the low-pressure cylinder under the back pressure change and the power of the turbine generator corresponding to the work done by the low-pressure cylinder under the heating condition, the change value of the turbine generator power after the back pressure change under the heating condition can be accurately calculated.

[0112] Optionally, step S500 may further include the following steps:

[0113] Using formula (4), the change in the power of the steam turbine generator set after the change in back pressure under heating conditions and the power of the steam turbine generator set under heating conditions are calculated to obtain the power of the steam turbine generator set after the change in back pressure under heating conditions.

[0114]

[0115] in, This indicates the power output of the steam turbine generator set after the back pressure changes under heating conditions. This indicates the power output of the steam turbine generator set under heating conditions; ΔW gr This indicates the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions.

[0116] To make it easier to understand, the following examples are provided:

[0117] Assuming the power of the steam turbine generator set under heating conditions is 622958kW, the change in power of the steam turbine generator set after the change in back pressure under heating conditions is -9127.47kW. Then, substitute it into formula (4) for calculation: 622958+(-9127.47)=613830.53kW. The calculated power of the steam turbine generator set after the change in back pressure under heating conditions is 613830.53kW.

[0118] In this embodiment, by using formula (4) to calculate the change in the power of the turbine generator set after the change in back pressure under heating conditions, the power of the turbine generator set after the change in back pressure under heating conditions can be accurately calculated.

[0119] Optionally, step S600 may further include the following steps:

[0120] Using formula (5), the change in power of the steam turbine generator set after the change in back pressure under heating conditions, the power of the steam turbine generator set under heating conditions, and the heat consumption rate of the steam turbine generator set under heating conditions are calculated to obtain the heat consumption rate of the steam turbine generator set after the change in back pressure under heating conditions.

[0121]

[0122] in, This indicates the heat consumption rate of the steam turbine generator set after the back pressure changes under heating conditions; This indicates the heat consumption rate of the steam turbine generator set under heating conditions; This indicates the power output of the steam turbine generator set under heating conditions.

[0123] To make it easier to understand, the following examples are provided:

[0124] Assuming the heat consumption rate of the turbine generator set before the back pressure change under heating conditions is 7500 kJ / kWh, the power of the turbine generator set under heating conditions is 622958 kW, and the change in power of the turbine generator set after the back pressure change under heating conditions is -9127.47 kW, then substituting into formula (5) for calculation: 7500*(1-(-9127.47 / 622958))=7610 kJ / kWh, the heat consumption rate of the turbine generator set after the back pressure change under heating conditions is calculated to be 7610 kJ / kWh.

[0125] In this embodiment, by using formula (5) to calculate the change in power of the turbine generator set, the power of the turbine generator set, and the heat rate of the turbine generator set under heating conditions, the heat rate of the turbine generator set under heating conditions after the change in back pressure can be accurately calculated.

[0126] Optionally, the correction factor for the power output of the turbine generator set due to the preset back pressure change is obtained in the following way:

[0127] Step 1: Obtain the back pressure of the pump under pure condensing conditions;

[0128] Step 2: Based on the preset back pressure correction curve for pure condensing conditions and the back pressure of the extraction turbine under pure condensing conditions, obtain the preset correction coefficient for the power of the turbine generator set due to the change in back pressure.

[0129] The preset back pressure correction curve for pure condensing operation is used to characterize the relationship between back pressure and the correction coefficient of turbine generator power. After reading the preset back pressure correction curve for pure condensing operation, the relationship between back pressure and the correction coefficient of turbine generator power is shown in Table 1 below.

[0130]

[0131]

[0132] Table 1. Correction coefficient parameters for back pressure on power.

[0133] Specifically, after obtaining the back pressure of the extraction turbine, the correction coefficient for the power of the turbine generator set due to the change in back pressure can be found in Table 1.

[0134] In this embodiment, since the preset back pressure correction curve for pure condensing conditions is relatively complete and has a high accuracy, the correction coefficient of the back pressure change under pure condensing conditions on the power of the turbine generator set can be accurately found through the preset back pressure correction curve for pure condensing conditions, which provides an effective guarantee for the accuracy of the subsequent calculation process.

[0135] To facilitate a better understanding of the present invention, a specific embodiment is provided below for detailed description:

[0136] Taking a 660MW supercritical turbine generator unit of a thermal power plant in China as an example, as shown in Table 1, Table 1 shows the thermodynamic performance parameters of the turbine generator unit under pure condensing and heating conditions.

[0137]

[0138]

[0139] Table 2. Thermal performance parameters for pure condensation conditions.

[0140] Referring to Table 2, the specific calculation process is given:

[0141] I. Calculate the steam flow rate of each stage in the high-pressure and intermediate-pressure cylinders of the steam turbine unit:

[0142] (1) 1868.90-5.79=1863.11, that is: the steam flow rate of the main steam to the regulating stage under pure condensing conditions is 1863.11t / h;

[0143] (2) 1863-24.21=1838.9, that is: the steam flow rate from the regulating stage to the first stage of extraction is 1838.9t / h;

[0144] (3) 1838.9-121.20=1717.7, that is: the steam flow rate from the extraction section to the high-pressure cylinder exhaust under pure condensing conditions is 1717.7t / h;

[0145] (4) 1561.84-(-4.77)+24.21=1590.82, that is: the steam flow rate from reheat steam to the third stage extraction steam under pure condensing conditions is 1590.82t / h;

[0146] (5) 1590.82 - 68.23 = 1522.59, that is: the steam flow rate from the three-stage extraction to the intermediate pressure cylinder exhaust under pure condensing conditions is 1522.59 t / h;

[0147] II. Calculate the work done by steam in each stage of the high- and intermediate-pressure cylinders of the steam turbine:

[0148] (6) 1863.11*(3398.80-3334.93) / 3.6=33054.74, that is: the work done by the main steam after reaching the regulating stage under pure condensing conditions is 33054.74kW;

[0149] (7)1838.9*(3334.93-3081.80) / 3.6=129300.69, that is: the power output of the regulating stage to the first stage of steam extraction under pure condensing conditions is 129300.69kW;

[0150] (8) 1717.7*(3081.80-2991.20) / 3.6=43229.03, that is: the work done by the extraction of steam to the high-pressure cylinder is 43229.03kW;

[0151] (9)1590.82*(3596.00-3415.20) / 3.6=79894.42, that is: the work done by the reheat steam to the third stage extraction under pure condensing conditions is 79894.42kW;

[0152] (10)1522.59*(3415.20-3223.40) / 3.6=81120.38, that is: the power output of the three-stage extraction steam to the intermediate pressure cylinder exhaust steam under pure condensing conditions is 81120.38kW;

[0153] 3. Calculate the work done by the high-pressure, intermediate-pressure, and low-pressure cylinders of the steam turbine separately, and convert the work done by the low-pressure cylinder into the corresponding generator power:

[0154] (11)33054.74+129300.69+43229.03=205584.46, that is: the power output of the high-pressure cylinder under pure condensation conditions is 205584.46kW;

[0155] (12)79894.42+81120.38=161014.80, that is: the power output of the medium-pressure cylinder under pure condensing conditions is 161014.80kW;

[0156] (13)660014.00 / (98.900*99.700)-205584.46-161014.80=302763.74, that is: the power output of the low-pressure cylinder under pure condensing conditions is 302763.74kW;

[0157] (14)302763.74*98.900*99.700=307052.34, that is: the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder under pure condensing conditions is 307052.34kW;

[0158] IV. Calculate the generator power change after back pressure change based on the correction curve of back pressure to generator power under pure condensing conditions:

[0159] (15)660014*(-1.92 / 100)=-12672.27, that is: the change in power of the steam turbine generator set after the back pressure change under pure condensing conditions is -12672.27kW;

[0160] V. Convert the generator power change value after the back pressure change under pure condensing conditions into a change coefficient of generator power relative to the work done by the low-pressure cylinder:

[0161] (16)-12672.27 / 307052.34*100=-4.13%, that is: the power variation coefficient of the turbine generator set corresponding to the low-pressure cylinder doing work is -4.13%;

[0162] VI. Calculate the change in generator power under heating conditions after the back pressure changes, based on the change coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder:

[0163] (17)221161.04*(-4.14 / 100)=-9127.47, that is: the change in power of the steam turbine generator set after the change in back pressure under heating conditions is -9127.47kW;

[0164] VII. Calculate the generator power after back pressure correction for heating conditions:

[0165] (18)622958+(-9127.47)=613830.53, that is: the power of the steam turbine generator set after the back pressure change under the heating condition is 613830.53kW;

[0166] 8. Correction calculation for turbine heat rate under heating conditions after back pressure change:

[0167] (19)7500*(1-(-9127.47 / 622958))=7610kJ / kWh, that is: the heat consumption rate of the steam turbine generator set after the back pressure change under the heating condition is 7610kJ / kWh.

[0168] It should be noted that the calculations above are the power of the turbine generator set after the back pressure change and the heat consumption rate of the turbine generator set after the back pressure change under the maximum extraction heating condition. If there are other heating conditions that need to be calculated, you can refer to the above steps (1)-(19) for calculation. It will not be repeated here.

[0169] After calculating the power and heat rate of the turbine generator set under heating conditions after back pressure changes, the power correction coefficient for the turbine generator set under heating conditions is obtained by dividing the power difference under heating conditions by the power of the turbine generator set under heating conditions (613830.53-622958.00) / 622958.00 = -1.47%. Similarly, the heat rate correction coefficient for the turbine generator set under heating conditions is obtained by dividing the heat rate difference under heating conditions by the heat rate of the turbine generator set under heating conditions (7610-7500) / 7500 = 1.47%. Finally, the power correction coefficient and heat rate coefficient under different back pressure changes are calculated, thus constructing a system as follows: Figure 4 and Figure 5 The graph shown.

[0170] pass Figure 4 and Figure 5 It can be seen that after the back pressure changes, the correction coefficients for the power and heat rate of the turbine generator set under pure condensing conditions are the largest, followed by the rated extraction heating condition, and the correction coefficients for the maximum extraction heating condition are the smallest. This is because as the extraction heat supply increases, the power ratio of the low-pressure cylinder gradually decreases, thus making the impact of back pressure on the power and heat rate of the turbine generator set smaller and smaller.

[0171] Please refer to Figure 3 , Figure 3 This is a schematic diagram of a steam turbine generator set power and heat rate calculation device provided in an embodiment of this application.

[0172] Based on the same inventive concept, this invention also provides a turbine generator set power and heat rate calculation device 200, which includes:

[0173] The data acquisition module 210 is used to acquire the power of the steam turbine generator set and the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder under heating and pure condensing conditions, respectively, as well as the heat consumption rate of the steam turbine generator set under heating conditions.

[0174] The first power calculation module 220 is used to obtain the change value of the turbine generator set power after the back pressure change under pure condensing conditions based on the turbine generator set power under pure condensing conditions and the correction coefficient of the preset back pressure change on the turbine generator set power.

[0175] The coefficient calculation module 230 is used to obtain the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder based on the change value of the turbine generator set after the back pressure change under pure condensing conditions and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under pure condensing conditions.

[0176] The second power calculation module 240 is used to obtain the change value of the turbine generator set power after the back pressure change under the heating condition based on the change coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under the heating condition.

[0177] The power correction module 250 is used to obtain the power of the turbine generator set after the back pressure change under the heating condition based on the change value of the power of the turbine generator set after the back pressure change under the heating condition and the power of the turbine generator set under the heating condition.

[0178] The heat rate correction module 260 is used to obtain the heat rate of the turbine generator set under the heating condition based on the change in power of the turbine generator set after the change in back pressure under the heating condition, the power of the turbine generator set after the change in back pressure under the heating condition, and the heat rate of the turbine generator set under the heating condition.

[0179] It should be understood that this device corresponds to the above-described embodiment of the method for calculating the power and heat rate of a steam turbine generator set, and is capable of performing the various steps involved in the above-described method embodiment. The specific functions of this device can be found in the description above, and detailed descriptions are omitted here to avoid repetition. The device includes at least one software functional module that can be stored in memory or embedded in the device's operating system (OS) in the form of software or firmware.

[0180] Based on the same inventive concept, embodiments of the present invention also provide an electronic device, including: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the above-described method for calculating the power and heat rate of a steam turbine generator set is performed.

[0181] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0182] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0183] This invention also provides a computer-readable storage medium storing instructions that, when executed by a processor, are adapted to execute a program having the following steps: obtaining the turbine generator power and the turbine generator power corresponding to the low-pressure cylinder work quantity under heating and pure condensing conditions, respectively, and the turbine generator heat rate under heating conditions; obtaining the change value of the turbine generator power after the back pressure change under pure condensing conditions based on the turbine generator power under pure condensing conditions and a correction coefficient for the turbine generator power based on a preset back pressure change; and obtaining the low-pressure cylinder work quantity based on the change value of the turbine generator power after the back pressure change under pure condensing conditions and the turbine generator power corresponding to the low-pressure cylinder work quantity under pure condensing conditions. The variation coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder; based on the variation coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder and the turbine generator set power corresponding to the work done by the low-pressure cylinder under heating conditions, the change value of the turbine generator set power after the change of back pressure under heating conditions is obtained; based on the change value of the turbine generator set power after the change of back pressure under heating conditions and the turbine generator set power under heating conditions, the turbine generator set power after the change of back pressure under heating conditions is obtained; based on the change value of the turbine generator set power after the change of back pressure under heating conditions, the turbine generator set power after the change of back pressure under heating conditions, and the turbine generator set heat rate under heating conditions, the heat rate of the turbine generator set after the change of back pressure under heating conditions is obtained.

[0184] In one embodiment, the above-mentioned method for calculating the power and heat rate of the steam turbine generator set further includes: using formula (1), calculating the power of the steam turbine generator set under pure condensing conditions and the correction coefficient of the steam turbine generator set power due to the change in preset back pressure, to obtain the change value of the steam turbine generator set power after the change in back pressure under pure condensing conditions; ΔW=W e ×θ e / 100(1); where ΔW represents the change in power of the turbine generator set after the back pressure change under pure condensing conditions; W e θ represents the power output of the steam turbine generator unit under pure condensing conditions. e This represents the correction factor for the power output of the turbine generator set due to changes in the preset back pressure.

[0185] In one embodiment, the above-mentioned method for calculating the power and heat rate of the steam turbine generator set further includes: using formula (2), calculating the change value of the power of the steam turbine generator set after the back pressure change under pure condensing conditions and the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder under pure condensing conditions, and obtaining the change coefficient of the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder. Where, θ LP-e ΔW represents the power variation coefficient of the turbine generator set corresponding to the work done by the low-pressure cylinder; ΔW represents the power variation of the turbine generator set after the back pressure change under pure condensing conditions; W LP-eThis indicates the turbine generator set power corresponding to the work done by the low-pressure cylinder under pure condensing conditions.

[0186] In one embodiment, the above method for calculating the power and heat rate of the steam turbine generator set further includes: using formula (3) to calculate the change coefficient of the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder and the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder under the heating condition, so as to obtain the change value of the power of the steam turbine generator set after the change of back pressure under the heating condition. Wherein, ΔW gr This represents the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions. θ represents the turbine generator set power corresponding to the work done by the low-pressure cylinder under heating conditions; LP-e This represents the coefficient of variation of the turbine generator set power corresponding to the work done by the low-pressure cylinder.

[0187] In one embodiment, the above method for calculating the power and heat rate of the steam turbine generator set further includes: using formula (4) to calculate the change value of the power of the steam turbine generator set after the change of back pressure under the heating condition and the power of the steam turbine generator set under the heating condition, so as to obtain the power of the steam turbine generator set after the change of back pressure under the heating condition. in, This indicates the power output of the steam turbine generator set after the back pressure changes under heating conditions. This indicates the power output of the steam turbine generator set under heating conditions; ΔW gr This indicates the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions.

[0188] In one embodiment, the above-mentioned method for calculating the power and heat rate of the steam turbine generator set further includes: using formula (5) to calculate the change value of the power of the steam turbine generator set after the change of back pressure under heating conditions, the power of the steam turbine generator set under heating conditions and the heat rate of the steam turbine generator set under heating conditions, so as to obtain the heat rate of the steam turbine generator set after the change of back pressure under heating conditions. in, This indicates the heat consumption rate of the steam turbine generator set after the back pressure changes under heating conditions; This indicates the heat consumption rate of the steam turbine generator set under heating conditions; This indicates the power output of the steam turbine generator set under heating conditions.

[0189] In one embodiment, the above method for calculating the power and heat rate of the steam turbine generator set further includes: obtaining the back pressure of the extraction turbine under pure condensing conditions; and obtaining a preset correction coefficient for the power of the steam turbine generator set based on the preset back pressure correction curve under pure condensing conditions and the back pressure of the extraction turbine under pure condensing conditions.

[0190] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0191] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0192] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0193] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0194] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0195] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0196] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0197] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for calculating the power and heat rate of a steam turbine generator set, characterized in that, include: The power of the steam turbine generator set and the power of the low-pressure cylinder corresponding to the heating and pure condensing conditions are obtained respectively, as well as the heat consumption rate of the steam turbine generator set under the heating condition. Based on the turbine generator set power under the pure condensing condition and the correction coefficient of the turbine generator set power to the preset back pressure change, the change value of the turbine generator set power after the back pressure change under the pure condensing condition is obtained. Based on the change value of the turbine generator set after the back pressure change under the pure condensing condition and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under the pure condensing condition, the change coefficient of the power of the turbine generator set corresponding to the work done by the low-pressure cylinder is obtained. Based on the variation coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator corresponding to the work done by the low-pressure cylinder under heating conditions, the change value of the turbine generator power after the back pressure change under heating conditions is obtained. Based on the change in the power of the steam turbine generator set after the back pressure change under the heating condition and the power of the steam turbine generator set under the heating condition, the power of the steam turbine generator set after the back pressure change under the heating condition is obtained. Based on the change in power of the turbine generator set after the back pressure change under the heating condition, the power of the turbine generator set after the back pressure change under the heating condition, and the heat consumption rate of the turbine generator set under the heating condition, the heat consumption rate of the turbine generator set after the back pressure change under the heating condition is obtained.

2. The method for calculating the power and heat rate of a steam turbine generator set according to claim 1, characterized in that, The method for obtaining the change in turbine generator power under pure condensing conditions based on the turbine generator power under the pure condensing condition and the correction coefficient for the turbine generator power under the preset back pressure change includes: Using formula (1), the power of the steam turbine generator set under the pure condensing condition and the correction coefficient of the steam turbine generator set power due to the change of the preset back pressure are calculated to obtain the change value of the steam turbine generator set power after the change of the back pressure under the pure condensing condition. ΔW=W e ×θ e / 100(1); Where ΔW represents the change in power of the turbine generator unit after the back pressure change under pure condensing conditions; W e θ represents the power output of the steam turbine generator unit under pure condensing conditions. e This represents the correction factor for the power output of the turbine generator set due to changes in the preset back pressure.

3. The method for calculating the power and heat rate of a steam turbine generator set according to claim 1, characterized in that, The method for obtaining the turbine generator set power variation coefficient corresponding to the low-pressure cylinder work based on the back pressure change value under the pure condensing condition and the turbine generator set power corresponding to the low-pressure cylinder work under the pure condensing condition includes: Using formula (2), the change value of the turbine generator power after the back pressure change under the pure condensing condition and the turbine generator power corresponding to the work done by the low-pressure cylinder under the pure condensing condition are calculated to obtain the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder. Where, θ LP-e ΔW represents the power variation coefficient of the turbine generator set corresponding to the work done by the low-pressure cylinder; ΔW represents the power variation of the turbine generator set after the back pressure change under pure condensing conditions; W LP-e This indicates the turbine generator set power corresponding to the work done by the low-pressure cylinder under pure condensing conditions.

4. The method for calculating the power and heat rate of a steam turbine generator set according to claim 1, characterized in that, The method of obtaining the change value of the turbine generator set power after the back pressure change under heating conditions based on the change coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder and the turbine generator set power corresponding to the work done by the low-pressure cylinder under heating conditions includes: Using formula (3), the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator corresponding to the work done by the low-pressure cylinder under the heating condition are calculated to obtain the change value of the turbine generator power after the back pressure change under the heating condition. Wherein, ΔW gr This represents the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions. θ represents the turbine generator set power corresponding to the work done by the low-pressure cylinder under heating conditions; LP-e This represents the coefficient of variation of the turbine generator set power corresponding to the work done by the low-pressure cylinder.

5. The method for calculating the power and heat rate of a steam turbine generator set according to claim 1, characterized in that, The process of obtaining the turbine generator set power under the heating condition based on the change in back pressure under the heating condition and the turbine generator set power under the heating condition includes: Using formula (4), the change in the power of the steam turbine generator set after the change in back pressure under the heating condition and the power of the steam turbine generator set under the heating condition are calculated to obtain the power of the steam turbine generator set after the change in back pressure under the heating condition. in, This indicates the power output of the steam turbine generator set after the back pressure changes under heating conditions. This indicates the power output of the steam turbine generator set under heating conditions; ΔW gr This indicates the change in the power output of the steam turbine generator set after a change in back pressure under heating conditions.

6. The method for calculating the power and heat rate of a steam turbine generator set according to claim 1, characterized in that, The process of obtaining the turbine generator set heat rate under heating conditions based on the change in turbine generator set power after back pressure change, the turbine generator set power after back pressure change, and the turbine generator set heat rate under heating conditions includes: Using formula (5), the change in power of the steam turbine generator set after the change in back pressure under the heating condition, the power of the steam turbine generator set under the heating condition, and the heat consumption rate of the steam turbine generator set under the heating condition are calculated to obtain the heat consumption rate of the steam turbine generator set after the change in back pressure under the heating condition. in, This indicates the heat consumption rate of the steam turbine generator set after the back pressure changes under heating conditions; This indicates the heat rate of the steam turbine generator set under heating conditions; W e gr This indicates the power output of the steam turbine generator set under heating conditions.

7. The method for calculating the power and heat rate of a steam turbine generator set according to claim 1, characterized in that, The correction coefficient for the power output of the turbine generator set based on the preset back pressure change is obtained in the following way: Obtain the back pressure of the extraction unit under pure condensation conditions; Based on the preset back pressure correction curve for pure condensing operation and the back pressure of the extraction turbine under pure condensing operation, the correction coefficient of the preset back pressure change on the power of the turbine generator set is obtained.

8. A device for calculating the power and heat rate of a steam turbine generator set, characterized in that, include: The data acquisition module is used to acquire the power of the steam turbine generator set and the power of the steam turbine generator set corresponding to the work done by the low-pressure cylinder under heating and pure condensing conditions, respectively, as well as the heat consumption rate of the steam turbine generator set under heating conditions. The first power calculation module is used to obtain the change value of the turbine generator set power after the back pressure change under the pure condensing condition based on the turbine generator set power under the pure condensing condition and the correction coefficient of the turbine generator set power under the preset back pressure change. The coefficient calculation module is used to obtain the change coefficient of the turbine generator power corresponding to the work done by the low-pressure cylinder based on the change value of the turbine generator set after the back pressure change under the pure condensing condition and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under the pure condensing condition. The second power calculation module is used to obtain the change value of the turbine generator set power after the back pressure change under the heating condition based on the change coefficient of the turbine generator set power corresponding to the work done by the low-pressure cylinder and the power of the turbine generator set corresponding to the work done by the low-pressure cylinder under the heating condition. The power correction module is used to obtain the power of the turbine generator set after the back pressure change under the heating condition based on the change value of the power of the turbine generator set after the back pressure change under the heating condition and the power of the turbine generator set under the heating condition. The heat rate correction module is used to obtain the heat rate of the turbine generator set under the heating condition based on the change in power of the turbine generator set after the back pressure change, the power of the turbine generator set after the back pressure change, and the heat rate of the turbine generator set under the heating condition.

9. An electronic device, characterized in that, include: A processor and a memory, the memory storing machine-readable instructions executable by the processor, which, when executed by the processor, perform the method for calculating the power and heat rate of a steam turbine generator set as described in any one of claims 1-7.

10. A computer-readable storage medium storing computer instructions, characterized in that, When the computer instructions are executed on the computer, the computer performs the calculation method for the power and heat rate of the steam turbine generator set as described in any one of claims 1-7.

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