Method and device for correcting the power reduction of a nuclear power plant under steam extraction

Abstract

The application discloses a correction calculation method and device for nuclear power main steam extraction energy supply and power reduction value of a unit, and belongs to the technical field of nuclear power unit operation and control.The method comprises the following steps: calculating the turbine power and the main steam flow under the pure condensation working condition and the measured state; calculating the corrected turbine power and the corrected main steam flow under the pure condensation working condition; calculating the turbine power and the main steam flow under the energy supply working condition and the measured state; calculating the corrected turbine power under the energy supply working condition; calculating the required main steam extraction flow under the design boundary condition of the energy station; calculating the required main steam extraction flow under the design main steam extraction enthalpy condition; calculating the main steam extraction flow under the design main steam extraction enthalpy condition; calculating the correction amount of the main steam extraction flow difference to the unit power; and calculating the corrected conventional island power reduction value under the design steam supply parameter and the design steam supply flow condition.The application can be used for evaluating the influence of the nuclear power main steam extraction energy supply on the conventional island power reduction.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power unit performance analysis, and specifically relates to a method and apparatus for correcting the power reduction value under the main steam extraction power supply of nuclear power plants. Background Technology

[0002] The petrochemical industry is one of China's six major energy-intensive industries. Its heat and electricity supply primarily relies on coal-fired combined heat and power (CHP) and centralized heating from large boilers, supplemented by decentralized coal-fired boilers and other clean energy sources. With the introduction of national "dual carbon" targets, energy consumption control targets, and rigid constraints on safety and environmental protection, the petrochemical industry's traditional energy consumption methods are facing significant challenges. At the same time, policies such as the international Carbon Boundary Adjustment Mechanism (CBAM) may affect the international competitiveness of petrochemical products. Accelerating the application of new energy sources such as nuclear power in the petrochemical industry is therefore imperative.

[0003] Currently, nuclear power and other new energy sources have been partially applied in the petrochemical industry in China. One project uses the secondary loop steam from the turbine system of a nuclear power unit as its heat source. The design incorporates multiple isolation layers, including the primary loop, secondary loop, and industrial steam loop of the nuclear power plant. Under these physically isolated conditions, multi-stage heat exchange technology is used to transport 1.8 MPa, 248 degrees Celsius, and 600 tons per hour of steam through the industrial steam network to the Lianyungang petrochemical industrial base via an independent isolation loop. The nuclear power unit is equipped with four safety barriers, ensuring the cleanliness and safety of the nuclear steam supply from the source.

[0004] However, there is currently no specific calculation method for the power reduction in the secondary circuit caused by the extraction of main steam from the secondary circuit. Summary of the Invention

[0005] The purpose of this invention is to provide a method and apparatus for correcting the power reduction value under the main steam extraction power supply of nuclear power plants. For the design of the thermal system of nuclear power turbines with steam power supply, this method can be used to correct the measured results to the relevant design boundaries of steam power supply during the steam power supply performance test of the turbine.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The method for correcting the power reduction under nuclear power main steam extraction power supply includes the following steps: Conduct conventional island thermal performance tests, record the recommended conventional turbine performance test measurement parameters in the regulations, and calculate the turbine electrical power under the measured conditions of pure condensing operation. P cn and main steam flow F cn ; Based on the measured turbine power under pure condensing conditions P cnand main steam flow F cn Corrected calculations were performed to obtain the turbine power under pure condensing conditions. P cn_cor and main steam flow F cn_cor ; Based on the corrected turbine power under pure condensing conditions P cn_cor and main steam flow F cn_cor The correction factor for the power output of the unit's main steam flow rate was calculated. φ ; A conventional island thermodynamic performance test was conducted under the design steam turbine power supply condition, and the turbine electrical power under the measured power supply condition was calculated. P gn ; The measured power of the steam turbine under actual power supply conditions P gn After correction, the corrected turbine power was calculated under the power supply condition. P gn_cor ; Based on the correction curves from the energy station equipment manufacturer, correction calculations are performed to obtain the main steam extraction flow rate required for the energy station to be corrected to the design boundary conditions under power supply conditions. F 1-抽需 According to the main steam extraction flow rate F 1-抽需 Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The required main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d-抽需 ; Based on the flow rate of the main steam extraction header of the energy station F 1. Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d ; The power correction factor based on the main steam flow rate φ The required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 and the main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step K. F1d The correction amount for the unit power due to the difference in main steam extraction flow rate was calculated. ΔP cor ; Turbine power corrected according to pure condensing operating conditions P cn_cor Corrected turbine power under power supply conditions P gn_cor Correction amount for unit power due to the difference between main steam extraction flow rate and main steam flow rate. ΔP cor The corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions was calculated. ΔP cor_d .

[0007] A further improvement of this invention lies in the corrected turbine power output under pure condensing conditions. P cn_cor The calculation method is shown in formula (1): (1) In the formula: P cn_cor The corrected power output under pure condensing conditions is expressed in MW. P cn The measured power of the steam turbine under pure condensing conditions is expressed in MW. C 1 is the correction factor for turbine power based on the main steam pressure before the main steam valve; C 2 is the correction factor for turbine power based on the main steam humidity before the main steam valve; C 3 represents the correction factor for turbine exhaust pressure on turbine power; C 4 represents the correction factor for reactor thermal power to turbine power; C 5 is the generator power factor correction factor for turbine power.

[0008] A further improvement of this invention lies in the corrected main steam flow rate under pure condensing conditions. F cn_cor The calculation method is shown in formula (2): (2) In the formula: F cn_cor The corrected main steam flow rate under pure condensing conditions is expressed in t / h. F cn The test main steam flow rate under pure condensing conditions is expressed in t / h. H cn The value is the enthalpy of the main steam under pure condensation conditions, in kJ / kg. H d The design value for the main steam enthalpy is given in kJ / kg.

[0009] A further improvement of this invention lies in the correction factor for the power output based on the main steam flow rate. φ The calculation method is shown in formula (3): (3) In the formula: φ The correction factor for power output based on main steam flow rate, J / kg; P cn_cor The corrected power output under pure condensing conditions is expressed in MW. F cn_cor The corrected main steam flow rate under pure condensing conditions is expressed in t / h.

[0010] A further improvement of this invention lies in the corrected turbine power output under power supply conditions. P gn_cor The calculation method is shown in formula (4): (4) In the formula: P gn_cor The corrected power output under power supply conditions is expressed in MW. P gn The measured power output of the steam turbine under actual power supply conditions is expressed in MW. C 1 is the correction factor for turbine power based on the main steam pressure before the main steam valve; C 2 is the correction factor for turbine power based on the main steam humidity before the main steam valve; C 3 represents the correction factor for turbine exhaust pressure on turbine power; C 4 represents the correction factor for reactor thermal power to turbine power; C 5 is the generator power factor correction factor for turbine power; C 6 represents the correction factor for the turbine power output based on the unit's heat supply; C 7 is the correction factor for turbine power based on heating return water temperature.

[0011] A further improvement of this invention lies in the main steam extraction flow rate under the designed main steam extraction enthalpy condition. F 1d The calculation method is shown in formula (5): (5) In the formula: F 1d The main steam extraction flow rate, t / h, is calculated under the design main steam extraction enthalpy condition. F 1 represents the flow rate of the main steam extraction header of the energy station, in t / h; H gn The enthalpy of the main steam was tested under power supply conditions, in kJ / kg. H d The design value for the main steam enthalpy is given in kJ / kg.

[0012] A further improvement of this invention lies in the main steam extraction flow rate required under the design main steam extraction enthalpy condition. F 1d-抽需 The calculation method is shown in formula (6): (6) In the formula: F 1d-抽需 The required main steam extraction flow rate (t / h) under the design main steam extraction enthalpy condition; F 1-抽需 The required main steam extraction flow rate (t / h) for adjusting the energy station to the design boundary conditions; H gn The enthalpy of the main steam was tested under power supply conditions, in kJ / kg. H d The design value for the main steam enthalpy is given in kJ / kg.

[0013] A further improvement of this invention lies in the correction amount for the unit power caused by the difference in main steam extraction flow rate. ΔP cor The calculation method is shown in formula (7): (7) In the formula: ΔP cor The correction amount for the unit power due to the difference in main steam extraction flow rate, in MW; F 1d The main steam extraction flow rate, t / h, is calculated under the design main steam extraction enthalpy condition. F 1d-抽需 The required main steam extraction flow rate (t / h) under the design main steam extraction enthalpy condition; φ This is the correction factor for the power output based on the unit's main steam flow rate.

[0014] A further improvement of this invention lies in the corrected power reduction value of the conventional island under the conditions of design steam supply parameters and design steam supply flow rate. ΔP cor_d The calculation method is shown in formula (8): (8) In the formula: ΔP cor_d Let MW be the corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions; P cn_cor The corrected electric power (MW) under pure condensing conditions. P gn_cor The corrected power output under power supply conditions is expressed in MW. ΔP corThe correction factor for the unit power due to the difference in main steam extraction flow rate, in MW.

[0015] A device for correcting the power reduction under nuclear power plant main steam extraction power supply includes: The first calculation unit conducts conventional island thermal performance tests, records the recommended conventional turbine performance test measurement parameters in the regulations, and calculates the turbine electrical power under the measured conditions of pure condensing operation. P cn and main steam flow F cn ; The second calculation unit is based on the measured turbine power under pure condensing operating conditions. P cn and main steam flow F cn Corrected calculations were performed to obtain the turbine power under pure condensing conditions. P cn_cor and main steam flow F cn_cor ; The third calculation unit calculates the corrected turbine power output under pure condensing conditions. P cn_cor and main steam flow F cn_cor The correction factor for the power output of the unit's main steam flow rate was calculated. φ ; The fourth calculation unit conducts conventional island thermal performance tests under the design steam turbine power supply condition, and calculates the turbine electrical power under the measured power supply condition. P gn and; The fifth calculation unit calculates the turbine electrical power under actual power supply conditions. P gn After correction, the corrected turbine power was calculated under the power supply condition. P gn_cor ; The sixth calculation unit performs correction calculations based on the correction curves provided by the energy station equipment manufacturer, obtaining the main steam extraction flow rate required for the energy station to be corrected to the design boundary conditions under the power supply operating conditions. F 1-抽需 According to the main steam extraction flow rate F 1-抽需 Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The required main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d-抽需 ; The seventh calculation unit calculates the flow rate of the main steam extraction header of the energy station. F 1. Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d ; The eighth calculation unit uses a correction factor for power based on the main steam flow rate. φ The required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 and the main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step K. F 1d The correction amount for the unit power due to the difference in main steam extraction flow rate was calculated. ΔP cor ; The ninth calculation unit calculates the turbine electrical power corrected for pure condensing conditions. P cn_cor Corrected turbine power under power supply conditions P gn_cor Correction amount for unit power due to the difference between main steam extraction flow rate and main steam flow rate. ΔP cor The corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions was calculated. ΔP cor_d .

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: In nuclear power systems, the main steam system serves as the core thermodynamic loop connecting the nuclear island and the conventional island. Its parameters (pressure, temperature, and flow rate) directly determine the unit's thermodynamic performance and safety boundaries. When some main steam is extracted due to auxiliary system requirements (such as feedwater heating, deaeration, and plant steam), the actual operating conditions will deviate from the design baseline conditions. It is necessary to quantify the impact of steam extraction on the main steam system parameters, turbine inlet conditions, and unit power through corrective calculations to ensure that the system operates within safety limits and to accurately assess its economic efficiency.

[0017] In nuclear power systems, the main steam extraction correction calculation is a key step in ensuring the safe and economical operation of the steam turbine and accurately assessing the efficiency of the thermal system. Its core is to correct the extraction steam flow rate, enthalpy value and corresponding thermal contribution based on the deviation between the actual operating parameters and the design reference parameters, so as to achieve accurate calculation of the unit's thermal economy (such as heat rate and electrical power).

[0018] However, there is currently no specific calculation method for the power reduction in the secondary loop caused by the extraction of main steam from the secondary loop. This invention proposes a corrected calculation method and apparatus for the power reduction under the power supply of nuclear power main steam extraction, in order to evaluate the impact of nuclear power main steam extraction on the power reduction of the conventional island. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating the method for correcting the power reduction value under the main steam extraction power supply of nuclear power plants, as described in this invention.

[0021] Figure 2 This is a structural block diagram of the calculation device for correcting the decrease in electrical power under the main steam extraction power supply of nuclear power plants, as per the present invention. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0023] In the description of this invention, it should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0024] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] Example 1 like Figure 1 As shown, the method for correcting the power reduction value under nuclear power main steam extraction power supply provided by the present invention includes the following steps: Conduct conventional island thermal performance tests, record the recommended conventional turbine performance test measurement parameters in the regulations, and calculate the turbine electrical power under the measured conditions of pure condensing operation. P cn and main steam flow F cn ; Based on the measured turbine power under pure condensing conditions P cn and main steam flow F cn Corrected calculations were performed to obtain the turbine power under pure condensing conditions. P cn_cor and main steam flow F cn_cor ; Based on the corrected turbine power under pure condensing conditions P cn_cor and main steam flow F cn_cor The correction factor for the power output of the unit's main steam flow rate was calculated. φ ; A conventional island thermodynamic performance test was conducted under the design steam turbine power supply condition, and the turbine electrical power under the measured power supply condition was calculated. P gn ; The measured power of the steam turbine under actual power supply conditions P gn After correction, the corrected turbine power was calculated under the power supply condition. P gn_cor ; Based on the correction curves from the energy station equipment manufacturer, correction calculations are performed to obtain the main steam extraction flow rate required for the energy station to be corrected to the design boundary conditions under power supply conditions.F 1-抽需 According to the main steam extraction flow rate F 1-抽需 Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The required main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d-抽需 ; Based on the flow rate of the main steam extraction header of the energy station F 1. Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d ; The power correction factor based on the main steam flow rate φ The required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 and the main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step K. F 1d The correction amount for the unit power due to the difference in main steam extraction flow rate was calculated. ΔP cor ; Turbine power corrected according to pure condensing operating conditions P cn_cor Corrected turbine power under power supply conditions P gn_cor Correction amount for unit power due to the difference between main steam extraction flow rate and main steam flow rate. ΔP cor The corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions was calculated. ΔP cor_d .

[0029] In this embodiment, the corrected turbine power under pure condensing conditions P cn_cor The calculation method is shown in formula (1): (1) In the formula: P cn_cor The corrected power output under pure condensing conditions is expressed in MW. P cn The measured power of the steam turbine under pure condensing conditions is expressed in MW. C1 is the correction factor for turbine power based on the main steam pressure before the main steam valve; C 2 is the correction factor for turbine power based on the main steam humidity before the main steam valve; C 3 represents the correction factor for turbine exhaust pressure on turbine power; C 4 represents the correction factor for reactor thermal power to turbine power; C 5 is the generator power factor correction factor for turbine power.

[0030] In this embodiment, the corrected main steam flow rate under pure condensing conditions F cn_cor The calculation method is shown in formula (2): (2) In the formula: F cn_cor The corrected main steam flow rate under pure condensing conditions is expressed in t / h. F cn The test main steam flow rate under pure condensing conditions is expressed in t / h. H cn The value is the enthalpy of the main steam under pure condensation conditions, in kJ / kg. H d The design value for the main steam enthalpy is given in kJ / kg.

[0031] In this embodiment, the correction factor for power output based on main steam flow rate is... φ The calculation method is shown in formula (3): (3) In the formula: φ The correction factor for power output based on main steam flow rate, J / kg; P cn_cor The corrected power output under pure condensing conditions is expressed in MW. F cn_cor The corrected main steam flow rate under pure condensing conditions is expressed in t / h.

[0032] In this embodiment, the corrected turbine power under power supply conditions P gn_cor The calculation method is shown in formula (4): (4) In the formula: P gn_cor The corrected power output under power supply conditions is expressed in MW. P gn The measured power output of the steam turbine under actual power supply conditions is expressed in MW. C 1 is the correction factor for turbine power based on the main steam pressure before the main steam valve; C 2 is the correction factor for turbine power based on the main steam humidity before the main steam valve;C 3 represents the correction factor for turbine exhaust pressure on turbine power; C 4 represents the correction factor for reactor thermal power to turbine power; C 5 is the generator power factor correction factor for turbine power; C 6 represents the correction factor for the turbine power output based on the unit's heat supply; C 7 is the correction factor for turbine power based on heating return water temperature.

[0033] In this embodiment, the main steam extraction flow rate is designed under the main steam extraction enthalpy condition. F 1d The calculation method is shown in formula (5): (5) In the formula: F 1d The main steam extraction flow rate, t / h, is calculated under the design main steam extraction enthalpy condition. F 1 represents the flow rate of the main steam extraction header of the energy station, in t / h; H gn The enthalpy of the main steam was tested under power supply conditions, in kJ / kg. H d The design value for the main steam enthalpy is given in kJ / kg.

[0034] In this embodiment, the required main steam extraction flow rate under the designed main steam extraction enthalpy condition is specified. F 1d-抽需 The calculation method is shown in formula (6): (6) In the formula: F 1d-抽需 The required main steam extraction flow rate (t / h) under the design main steam extraction enthalpy condition; F 1-抽需 The required main steam extraction flow rate (t / h) for adjusting the energy station to the design boundary conditions; H gn The enthalpy of the main steam was tested under power supply conditions, in kJ / kg. H d The design value for the main steam enthalpy is given in kJ / kg.

[0035] In this embodiment, the correction amount for the unit power due to the difference in main steam extraction flow rate. ΔP cor The calculation method is shown in formula (7): (7) In the formula: ΔP cor The correction amount for the unit power due to the difference in main steam extraction flow rate, in MW;F 1d The main steam extraction flow rate, t / h, is calculated under the design main steam extraction enthalpy condition. F 1d-抽需 The required main steam extraction flow rate (t / h) under the design main steam extraction enthalpy condition; φ This is the correction factor for the power output based on the unit's main steam flow rate.

[0036] In this embodiment, the corrected conventional island power reduction value under the design steam supply parameters and design steam supply flow conditions is... ΔP cor_d The calculation method is shown in formula (8): (8) In the formula: ΔP cor_d Let MW be the corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions; P cn_cor The corrected electric power (MW) under pure condensing conditions. P gn_cor The corrected power output under power supply conditions is expressed in MW. ΔP cor The correction factor for the unit power due to the difference in main steam extraction flow rate, in MW.

[0037] Example 2 like Figure 1 As shown, the method for correcting the power reduction value under nuclear power main steam extraction power supply provided by the present invention includes the following steps: A. Conduct thermodynamic performance tests on conventional island steam turbines under pure condensing conditions (steam supply flow rate is 0): Conduct thermodynamic performance tests on steam turbines with steam supply under pure condensing conditions (steam supply flow rate is 0) according to ASME PTC 6-2004 "Test Procedures for Steam Turbines". Record parameters such as main feedwater pressure, main feedwater temperature, main feedwater flow rate, evaporator outlet pressure, evaporator outlet humidity, main steam pressure, steam turbine exhaust pressure, generator outlet power, excitation power, and power factor during the test.

[0038] B. Calculate the turbine power under measured conditions of pure condensing operation. P cn and main steam flow F cn Calculate the turbine electrical power under the measured conditions of pure condensing operation, according to ASME PTC 6-2004 "Test Procedure for Steam Turbines". P cn and main steam flow F cn Among them, the measured turbine electrical power under pure condensing operating conditions. Pcn Equal to the generator output power P m_cn Subtract excitation power P exc _cn Main steam flow F cn Equal to main water supply flow rate F fw_cn_ Subtract the unspecified leakage amount allocated to the evaporator side F xl_cn .

[0039] C. Calculate the corrected turbine power under pure condensing conditions. P cn_cor According to ASME PTC6-2004 "Test Procedure for Steam Turbines", the electric power of the steam turbine under pure condensing operating conditions was measured. P cn Correction calculations are performed, and the correction items include (a) the main steam pressure in front of the main steam valve, (b) the main steam humidity in front of the main steam valve, (c) the turbine exhaust pressure, (d) the reactor thermal power, and (e) the generator power factor.

[0040] D. Calculate the corrected main steam flow rate under pure condensing conditions. F cn_cor Corrected main steam flow rate under pure condensing conditions F cn_cor Equal to the measured main steam flow rate of the steam turbine under pure condensing conditions F cn Multiply by the measured enthalpy of the turbine's main steam under pure condensing conditions. H cn Divide by the design main steam enthalpy value H d .

[0041] E. Correction factor for power output of main steam flow rate of computer unit φ Based on the corrected turbine electrical power obtained in steps C and D P cn_cor and main steam flow F cn_cor Correction factor for power output of main steam flow rate of computer unit φ Proceed to step F; F. Conduct conventional island thermal performance tests under the design steam turbine power supply condition: Conduct conventional island thermal performance tests under the design steam turbine power supply condition according to ASME PTC 6-2004 "Steam Turbine Performance Test Procedure". In addition to the conventional turbine performance test measurement parameters recommended in the procedure (main feedwater pressure, main feedwater temperature, main feedwater flow rate, evaporator outlet pressure, evaporator outlet humidity, main steam pressure, turbine exhaust pressure, generator outlet power, excitation power, power factor, etc.), it is also necessary to measure the flow rate of the main steam extraction header of the energy station. F 1. Temperature of the main steam extraction header of the energy station T 1. Pressure of the main steam extraction header of the energy station P 1. Flow rate of condensate return main pipe of energy station F 2. Temperature of the condensate return header of the energy station T 2. Pressure of the condensate return main pipe of the energy station P 2. Flow rate of industrial steam supply main pipe at energy station F 3. Temperature of the industrial steam supply header at the energy station T 3. Pressure of industrial steam supply main pipe at energy station P 3. Flow rate of demineralized water main pipe in the energy station F 4. Temperature of the demineralized water header in the energy station T 4. Pressure of the demineralized water main pipe of the energy station P 4. Proceed to step G; G. Calculate the turbine power under measured operating conditions. P gn and main steam flow F cn Calculate the turbine's electrical power under measured power supply conditions according to ASME PTC 6-2004 "Test Procedure for Steam Turbines". P gn and main steam flow F gn Among them, the measured power of the steam turbine under actual power supply conditions. P gn Equal to the generator output power P m_gn Subtract excitation power P exc _gn Main steam flow F gn Equal to main water supply flow rate F fw_gn Subtract the unspecified leakage amount allocated to the evaporator side F xl_gn Proceed to step H; H. Calculate the corrected turbine power under power supply conditions. P gn_corThe corrected turbine electrical power under power supply conditions was obtained by modifying the calculation according to ASME PTC 6-2004 "Test Procedure for Steam Turbines". P gn_cor The corrected items include: (a) main steam pressure before the main steam valve, (b) main steam humidity before the main steam valve, (c) turbine exhaust pressure, (d) reactor thermal power, (e) generator power factor, (f) unit heat supply, and (g) heat supply return water temperature. Proceed to step I. I. Calculate the main steam extraction flow rate required to correct the energy station to the design boundary conditions. F 1-抽需 Based on the correction curves provided by the energy station equipment manufacturer, correction calculations are performed to obtain the main steam extraction flow rate required to correct the energy station to the design boundary conditions. F 1-抽需 Proceed to step J; J. Calculate the required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 Based on the results obtained in step I F 1-抽需 Enthalpy of main steam extraction under test conditions H gn and design main steam enthalpy value H d The required main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d-抽需 Proceed to step K; K. Calculate the main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d Based on the main steam extraction header flow rate of the energy station obtained in step F. F 1. Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d Proceed to step L; L. Calculate the correction amount for the unit power caused by the difference in main steam extraction flow rate. ΔP cor The power correction factor based on the main steam flow rate obtained in step E. φ The required main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step J. F 1d-抽需 and the main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step K. F 1dThe correction amount for the unit power due to the difference in main steam extraction flow rate was calculated. ΔP cor Proceed to step M; M. Corrected power reduction value of the conventional island under the conditions of design steam supply parameters and design steam supply flow rate. Δ P cor_d The turbine power corrected based on the pure condensing operating condition obtained in step C. P cn_cor The corrected turbine power obtained in step H under the power supply condition P gn_cor The correction amount for the difference in main steam extraction flow rate obtained in step L on the unit power. ΔP cor The corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions was calculated. Δ P cor_d .

[0042] In this embodiment, in steps A and F, the allowable fluctuation range of the rated pressure of the main steam of the unit is ±3%, and the allowable fluctuation range of the humidity of the main steam of the unit is ±0.005.

[0043] In this embodiment, in steps A and F, the sampling period set for the experiment is less than or equal to 10 seconds.

[0044] In this embodiment, in steps A and F, the unit needs to strictly isolate the system according to the system isolation list.

[0045] In this embodiment, in steps D, J, K, and L, the enthalpy value of the evaporator outlet can be obtained based on the measured evaporator outlet pressure and outlet humidity. Then, based on the measured pressure in front of the turbine main steam valve and the isoenthalpic process, the humidity value of the turbine inlet main steam is calculated using the properties of water vapor.

[0046] Example 3 like Figure 2 As shown, the correction calculation device for the power reduction value under nuclear power main steam extraction power supply provided by the present invention includes: The first calculation unit conducts conventional island thermal performance tests, records the recommended conventional turbine performance test measurement parameters in the regulations, and calculates the turbine electrical power under the measured conditions of pure condensing operation. P cn and main steam flow F cn ; The second calculation unit is based on the measured turbine power under pure condensing operating conditions. P cn and main steam flow Fcn Corrected calculations were performed to obtain the turbine power under pure condensing conditions. P cn_cor and main steam flow F cn_cor ; The third calculation unit calculates the corrected turbine power output under pure condensing conditions. P cn_cor and main steam flow F cn_cor The correction factor for the power output of the unit's main steam flow rate was calculated. φ ; The fourth calculation unit conducts conventional island thermal performance tests under the design steam turbine power supply condition, and calculates the turbine electrical power under the measured power supply condition. P gn ; The fifth calculation unit calculates the turbine electrical power under actual power supply conditions. P gn After correction, the corrected turbine power was calculated under the power supply condition. P gn_cor ; The sixth calculation unit performs correction calculations based on the correction curves provided by the energy station equipment manufacturer, obtaining the main steam extraction flow rate required for the energy station to be corrected to the design boundary conditions under the power supply operating conditions. F 1-抽需 According to the main steam extraction flow rate F 1-抽需 Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The required main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d-抽需 ; The seventh calculation unit calculates the flow rate of the main steam extraction header of the energy station. F 1. Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d ; The eighth calculation unit uses a correction factor for power based on the main steam flow rate. φ The required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 and the main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step K.F 1d The correction amount for the unit power due to the difference in main steam extraction flow rate was calculated. ΔP cor ; The ninth calculation unit calculates the turbine electrical power corrected for pure condensing conditions. P cn_cor Corrected turbine power under power supply conditions P gn_cor Correction amount for unit power due to the difference between main steam extraction flow rate and main steam flow rate. ΔP cor The corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions was calculated. ΔP cor_d .

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for correcting the power reduction value under nuclear power main steam extraction power supply, characterized in that, Includes the following steps: Conduct conventional island thermal performance tests, record the recommended conventional turbine performance test measurement parameters in the regulations, and calculate the turbine electrical power under the measured conditions of pure condensing operation. P cn and main steam flow F cn ; Based on the measured turbine electrical power under pure condensing conditions P cn and main steam flow F cn Corrected calculations were performed to obtain the turbine power under pure condensing conditions. P cn_cor and main steam flow F cn_cor ; Based on the corrected turbine power under pure condensing conditions P cn_cor and main steam flow F cn_cor The correction factor for the power output of the unit's main steam flow rate was calculated. φ ; A conventional island thermodynamic performance test was conducted under the design steam turbine power supply condition, and the turbine electrical power under the measured power supply condition was calculated. P gn ; The measured power of the steam turbine under actual power supply conditions P gn After correction, the corrected turbine power was calculated under the power supply condition. P gn_cor ; Based on the correction curves from the energy station equipment manufacturer, correction calculations are performed to obtain the main steam extraction flow rate required for the energy station to be corrected to the design boundary conditions under power supply conditions. F 1-抽需 According to the main steam extraction flow rate F 1-抽需 Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The required main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d-抽需 ; Based on the flow rate of the main steam extraction header of the energy station F 1. Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d ; The power correction factor based on the main steam flow rate φ The required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 and the main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step K. F 1d The correction amount for the unit power due to the difference in main steam extraction flow rate was calculated. ΔP cor ; Turbine power corrected according to pure condensing operating conditions P cn_cor Corrected turbine power under power supply conditions P gn_cor Correction amount for unit power due to the difference between main steam extraction flow rate and main steam flow rate. ΔP cor The corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions was calculated. ΔP cor_d .

2. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, Corrected turbine power under pure condensing conditions P cn_cor The calculation method is shown in formula (1): （1） In the formula: P cn_cor The corrected power output under pure condensing conditions is expressed in MW. P cn The measured power of the steam turbine under pure condensing conditions is expressed in MW. C 1 is the correction factor for turbine power based on the main steam pressure before the main steam valve; C 2 is the correction factor for turbine power based on the main steam humidity before the main steam valve; C 3 represents the correction factor for turbine exhaust pressure on turbine power; C 4 represents the correction factor for reactor thermal power to turbine power; C 5 is the generator power factor correction factor for turbine power.

3. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, Corrected main steam flow rate under pure condensing conditions F cn_cor The calculation method is shown in formula (2): （2） In the formula: F cn_cor The corrected main steam flow rate under pure condensing conditions is expressed in t / h. F cn The test main steam flow rate under pure condensing conditions is expressed in t / h. H cn The value is the enthalpy of the main steam under pure condensation conditions, in kJ / kg. H d The design value for the main steam enthalpy is kJ / kg.

4. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, Correction factor for power output based on main steam flow rate φ The calculation method is shown in formula (3): （3） In the formula: φ The correction factor for power output based on main steam flow rate, J / kg; P cn_cor The corrected power output under pure condensing conditions is expressed in MW. F cn_cor The corrected main steam flow rate under pure condensing conditions is expressed in t / h.

5. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, Corrected turbine power under power supply conditions P gn_cor The calculation method is shown in formula (4): （4） In the formula: P gn_cor The corrected power output under power supply conditions is expressed in MW. P gn The measured power output of the steam turbine under actual power supply conditions is expressed in MW. C 1 is the correction factor for turbine power based on the main steam pressure before the main steam valve; C 2 is the correction factor for turbine power based on the main steam humidity before the main steam valve; C 3 represents the correction factor for turbine exhaust pressure on turbine power; C 4 represents the correction factor for reactor thermal power to turbine power; C 5 is the generator power factor correction coefficient for turbine power; C 6 represents the correction factor for the turbine power output based on the unit's heat supply; C 7 is the correction factor for turbine power based on heating return water temperature.

6. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, The main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d The calculation method is shown in formula (5): （5） In the formula: F 1d The design steam extraction flow rate (t / h) is given under the given enthalpy conditions. F 1 represents the flow rate of the main steam extraction header of the energy station, in t / h; H gn The enthalpy of the main steam was tested under power supply conditions, in kJ / kg. H d The design value for the main steam enthalpy is kJ / kg.

7. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, The required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 The calculation method is shown in formula (6): （6） In the formula: F 1d-抽需 The required main steam extraction flow rate (t / h) under the design main steam extraction enthalpy condition; F 1-抽需 The required main steam extraction flow rate (t / h) for adjusting the energy station to the design boundary conditions; H gn The enthalpy of the main steam was tested under power supply conditions, in kJ / kg. H d The design value for the main steam enthalpy is kJ / kg.

8. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, Correction amount for unit power due to main steam extraction flow rate difference ΔP cor The calculation method is shown in formula (7): （7） In the formula: ΔP cor The correction amount for the unit power due to the difference in main steam extraction flow rate, in MW; F 1d The design steam extraction flow rate (t / h) is given under the given enthalpy conditions. F 1d-抽需 The required main steam extraction flow rate (t / h) under the design main steam extraction enthalpy condition; φ This is the correction factor for the power output based on the unit's main steam flow rate.

9. The method for correcting the power reduction value under nuclear power main steam extraction power supply as described in claim 1, characterized in that, Corrected power reduction of the conventional island under design steam supply parameters and design steam supply flow conditions ΔP cor_d The calculation method is shown in formula (8): （8） In the formula: ΔP cor_d Let MW be the corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions; P cn_cor The corrected electric power (MW) under pure condensing conditions. P gn_cor The corrected power output under power supply conditions is expressed in MW. ΔP cor The correction factor for the unit power due to the difference in main steam extraction flow rate, in MW.

10. A device for correcting the decrease in electrical power under nuclear power plant main steam extraction power supply, characterized in that, include: The first calculation unit conducts conventional island thermal performance tests, records the recommended conventional turbine performance test measurement parameters in the regulations, and calculates the turbine electrical power under the measured conditions of pure condensing operation. P cn and main steam flow F cn ; The second calculation unit is based on the measured turbine power under pure condensing operating conditions. P cn and main steam flow F cn Corrected calculations were performed to obtain the turbine power under pure condensing conditions. P cn_cor and main steam flow F cn_cor ; The third calculation unit calculates the corrected turbine power output under pure condensing conditions. P cn_cor and main steam flow F cn_cor The correction factor for the power output of the unit's main steam flow rate was calculated. φ ; The fourth calculation unit conducts conventional island thermal performance tests under the design steam turbine power supply condition, and calculates the turbine electrical power under the measured power supply condition. P gn and; The fifth calculation unit calculates the turbine electrical power under actual power supply conditions. P gn After correction, the corrected turbine power was calculated under the power supply condition. P gn_cor ; The sixth calculation unit performs correction calculations based on the correction curves provided by the energy station equipment manufacturer, obtaining the main steam extraction flow rate required for the energy station to be corrected to the design boundary conditions under the power supply operating conditions. F 1-抽需 According to the main steam extraction flow rate F 1-抽需 Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The required main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d-抽需 ; The seventh calculation unit calculates the flow rate of the main steam extraction header of the energy station. F 1. Enthalpy of main steam extraction under power supply test conditions H gn and design main steam enthalpy value H d The main steam extraction flow rate under the design main steam extraction enthalpy condition was calculated. F 1d ; The eighth calculation unit uses a correction factor for power based on the main steam flow rate. φ The required main steam extraction flow rate under the design main steam extraction enthalpy condition. F 1d-抽需 and the main steam extraction flow rate under the design main steam extraction enthalpy condition obtained in step K. F 1d The correction amount for the unit power due to the difference in main steam extraction flow rate was calculated. ΔP cor ; The ninth calculation unit calculates the turbine power output corrected for pure condensing conditions. P cn_cor Corrected turbine power under power supply conditions P gn_cor Correction amount for unit power due to the difference between main steam extraction flow rate and main steam flow rate. ΔP cor The corrected power reduction value of the conventional island under the design steam supply parameters and design steam supply flow conditions was calculated. ΔP cor_d .

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