A method for calculating the maximum winter output of a nuclear power steam turbine generator set

Abstract

The present invention relates to the field of nuclear power technology, and in particular to a method for calculating the maximum output of a nuclear power steam turbine generator set in winter. The speed measurement method is as follows: find the boundary limit conditions affecting the output of the nuclear power steam turbine generator set in the reactor following mode: the thermal power limit Q of the reactor primary loop t , the opening limit η of the high-pressure inlet steam control valve t , and the generator power limit W3; determine the seawater temperature T of the state to be measured, and find the relevant operating parameters when the seawater temperature was T in the most recent time; calculate the maximum output W when the seawater temperature is T T1 ; calculate the maximum output W when the seawater temperature is T T2 ; when the winter seawater temperature is T, the calculated value W of the maximum output of the steam turbine generator set is the minimum value among W T1 , W T2 , and W3. Without sacrificing the measurement accuracy, the present invention makes the measurement method more convenient and simple, and can be completed by general power plant technicians.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and particularly to a method for calculating the maximum output of a nuclear power steam turbine generator set in winter. Background Art

[0002] Nuclear power steam turbine generator sets are widely used in China's nuclear power construction. The output capacity of the steam turbine generator set directly affects the economic benefits of nuclear power plants.

[0003] With the decrease in seawater temperature in winter, it will affect the maximum output value of the steam turbine generator set. Therefore, there is an urgent need for a method that can simply and quickly calculate the maximum output value of the unit in winter, providing a theoretical basis for estimating the annual power generation of the unit and guiding the improvement of the winter output of nuclear power units.

[0004] Traditional calculation methods are to calculate through methods such as heat balance, equivalent enthalpy drop, matrix, and cycle function, or to establish a simulation model using digital simulation technology for calculation. The results calculated by these two methods are relatively accurate, but the workload is huge, the calculation cycle is long, and the difficulty is large, which is not suitable for power plant technicians. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for calculating the maximum output of a nuclear power steam turbine generator set in winter, which makes the calculation method more convenient and simple without sacrificing the calculation accuracy, and can be completed by general power plant technicians.

[0006] The present invention provides a method for calculating the maximum output of a nuclear power steam turbine generator set in winter, including the following steps:

[0007] Step S1: Find the boundary limit conditions that affect the output of the nuclear power steam turbine generator set in the reactor following mode. The boundary limit conditions include: the thermal power limit Q of the reactor primary loop t , the opening limit η of the high-pressure inlet steam control valve t , and the electric power limit W3 of the generator;

[0008] Step S2: Determine the seawater temperature T of the state to be calculated, and find the relevant operating parameters at the time when the seawater temperature was T last time. The relevant operating parameters include: the thermal power Q of the reactor primary loop when the seawater temperature is T T , the opening η of the high-pressure inlet steam control valve when the seawater temperature is T T , and the electric power W of the generator when the seawater temperature is T T ;

[0009] Step S3: Calculate the maximum output W when the seawater temperature is T T1 ;

[0010] Step S4: Calculate the maximum output W when the seawater temperature is T T2 ;

[0011] Step S5: When the winter seawater temperature is T, the measured value W of the maximum output of the steam turbine generator set is W T1 , W T2 , the minimum value among W T1 , W T2 , W3, that is, W = MIN{W

[0012] Preferably, in the said step S3, based on the reactor primary loop thermal power limit Q t Measure the maximum output W when the seawater temperature is T T1 .

[0013] Preferably, the method for measuring the maximum output W when the seawater temperature is T T1 is specifically as follows:

[0014] According to the reactor primary loop thermal power correction factor calculation function, calculate the thermal power correction factor C of the unit when the seawater temperature is T T ;

[0015] According to the correction factor, calculate the maximum output when measuring the seawater temperature of T based on the reactor primary loop thermal power limit Q t

[0016] Preferably, the calculation method of the thermal power correction factor C T is as follows:

[0017] According to the proportion of the reactor primary loop thermal power Q T to the reactor primary loop thermal power limit Q t at the most recent seawater temperature of T:

[0018] According to the reactor primary loop thermal power correction factor calculation function C = f(Q'), calculate the thermal power correction factor C of the unit when the seawater temperature is T T = f(Q T '-1).

[0019] Preferably, in the said step S4, based on the high-pressure admission throttle valve opening limit η t Measure the maximum output W when the seawater temperature is T T2 .

[0020] Preferably, in the said step S4, the method for measuring the maximum output W when the seawater temperature is T T2 is specifically as follows:

[0021] According to the steam flow K1 corresponding to the maximum empty stroke opening of the high-pressure throttle valve and the high-pressure admission throttle valve opening limit η t , measure the maximum output when the seawater temperature is T​

[0022] Preferably, in step S4, the method for measuring the maximum output W when the seawater temperature is T is as follows: T2 is specifically:

[0023] According to the steam flow - high - pressure regulating valve opening function, calculate the steam flow K when the seawater temperature is T T = f1(η T ), and the steam flow K when the high - pressure regulating valve is at the opening limit η t is t = f1(η t );

[0024] According to the above function, find the steam flow K1 corresponding to the maximum dead - band opening of the high - pressure regulating valve;

[0025] Based on the opening limit η t of the high - pressure steam inlet regulating valve, measure the maximum output when the seawater temperature is T

[0026] Preferably, the steam flow - high - pressure regulating valve opening function is determined by the opening action test of the high - pressure regulating valve during commissioning.

[0027] Compared with the prior art, the method for measuring the winter maximum output of the nuclear power steam turbine generator set of the present invention has a simple calculation method without going through cumbersome iterative calculations or modeling calculations, saving labor costs. After being verified by tests on a million - kilowatt - class nuclear power unit, when using this method to measure the maximum output of the unit at a seawater temperature of 14 °C in winter, it is 1097 MWe, and the actual maximum output of the unit at the same water temperature is 1096.3 MWe, with a difference of about 1 MWe, having a high accuracy and good overall effect. Specific Embodiments

[0028] To further understand the present invention, the following describes the implementation scheme of the present invention in combination with embodiments. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the present invention.

[0029] An embodiment of the present invention discloses a method for measuring the winter maximum output of a nuclear power steam turbine generator set, including the following steps:

[0030] Step S1: Find the boundary limit conditions affecting the output of the nuclear power steam turbine generator set in the reactor - following operation mode. The boundary limit conditions include: the reactor primary loop thermal power limit Q t , the opening limit η t of the high - pressure steam inlet regulating valve, and the generator power limit W3;

[0031] ​Step S2: Determine the seawater temperature T of the state to be measured, and search for the relevant operating parameters when the seawater temperature was T for the last time. The relevant operating parameters include: the thermal power Q of the primary loop of the reactor when the seawater temperature is T T , the opening η of the high-pressure inlet steam control valve when the seawater temperature is T T , the electric power W of the generator when the seawater temperature is T T ;

[0032] Step S3: Measure the maximum output W when the seawater temperature is T T1 ;

[0033] Step S4: Measure the maximum output W when the seawater temperature is T T2 ;

[0034] Step S5: When the seawater temperature in winter is T, the measured value W of the maximum output of the steam turbine generator set is the minimum value among W T1 , W T2 , W3, that is, W = MIN{W T1 , W T2 , W3}.

[0035] The following is a detailed description according to the steps:

[0036] Step S1: Search for the boundary limit conditions that affect the output of the nuclear power steam turbine generator set in the reactor following mode. The boundary limit conditions include: the thermal power limit Q of the primary loop of the reactor t , the opening limit η of the high-pressure inlet steam control valve t , the electric power limit W3 of the generator;

[0037] Step S2: Determine the seawater temperature T of the state to be measured, and search for the relevant operating parameters when the seawater temperature was T for the last time. The relevant operating parameters include: the thermal power Q of the primary loop of the reactor when the seawater temperature is T T , the opening η of the high-pressure inlet steam control valve when the seawater temperature is T T , the electric power W of the generator when the seawater temperature is T T ;

[0038] Step S3: Measure the maximum output W when the seawater temperature is T T1 ;

[0039] Based on the thermal power limit Q of the primary loop of the reactor t Measure the maximum output W when the seawater temperature is T T1 .

[0040] According to the proportion of the thermal power Q of the primary loop of the reactor when the seawater temperature was T for the last time T to the thermal power limit Q of the primary loop of the reactor t :

[0041] Calculate the thermal power correction factor C of the unit at seawater temperature T according to the function C = f(Q’) of the thermal power correction factor of the primary loop of the reactor T = f(Q T ’ - 1);

[0042] The calculation functions of the correction factors for different models of units are also different, and this function is provided by the steam turbine generator manufacturer before the acceptance test

[0043] Calculate the maximum output at seawater temperature T based on the primary loop thermal power limit Q of the reactor according to the correction factor t

[0044] Step S4: Measure the maximum output W at seawater temperature T T2 ;

[0045] Measure the maximum output W at seawater temperature T based on the opening limit η of the high - pressure inlet steam control valve t T2 .

[0046] The method for measuring the maximum output W at seawater temperature T T2 is specifically as follows:

[0047] Calculate the steam flow rate K at seawater temperature T according to the steam flow rate - high - pressure control valve opening function T = f1(η T ), and the steam flow rate K when the high - pressure control valve is at the opening limit η t t = f1(η t );

[0048] Find the steam flow rate K1 corresponding to the maximum idle stroke opening of the high - pressure control valve according to the above function

[0049] Measure the maximum output at seawater temperature T based on the opening limit η of the high - pressure inlet steam control valve t

[0050] The steam flow rate - high - pressure control valve opening function is determined by the high - pressure control valve opening action test during commissioning

[0051] Step S5: When the seawater temperature in winter is T, the measured value W of the maximum output of the steam turbine generator set is the minimum value among W T1 , W T2 , W3, that is, W = MIN{W T1 , W T2 , W3}.

[0052] ​​​​The method of the present invention can simply and quickly calculate the maximum output value of the unit in winter according to the current operating state of the unit, providing a theoretical basis for predicting the annual power generation of the unit and guiding the improvement of the winter output of the nuclear power unit.

[0053] To further understand the present invention, the following describes in detail the method for calculating the winter maximum output of the nuclear power steam turbine generator set provided by the present invention in combination with embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0054] Embodiment 1

[0055] Step 1: Find the boundary limit conditions affecting the output of the nuclear power steam turbine generator set in the reactor following mode: 1. The thermal power limit of the reactor primary loop (Q t ); 2. The opening limit of the high-pressure inlet steam control valve (η t ); 3. The electric power limit of the generator (W3);

[0056] Step 2: Determine the seawater temperature (T) of the state to be measured, and find the relevant operating parameters when the seawater temperature was (T) last time: 1. The thermal power of the reactor primary loop when the seawater temperature is (T) (Q T ); 2. The opening of the high-pressure inlet steam control valve when the seawater temperature is (T) (η T ); 3. The electric power of the generator when the seawater temperature is (T) (W T );

[0057] Step 3: Calculate the maximum output (W t ) at the seawater temperature of (T) based on the thermal power limit of the reactor primary loop (Q T1 ):

[0058] 1. The ratio of the thermal power of the reactor primary loop (Q T ) to the thermal power limit of the reactor primary loop (Q t ) when the seawater temperature was T last time

[0059] 2. Calculate the thermal power correction factor C of the unit at the seawater temperature of T according to the reactor primary loop thermal power correction factor calculation function C = f(Q’) T = f(Q T ’ - 1);

[0060] Note: The calculation functions of the correction factors for different models of units are also different, and this function is provided by the steam turbine generator set manufacturer before the acceptance test.

[0061] 3. Calculate the maximum output at the seawater temperature of (T) based on the thermal power limit of the reactor primary loop (Q t ) according to the correction factor

[0062] Step Four: Calculate the maximum output (W t ) when the seawater temperature is (T) based on the opening limit of the high-pressure steam admission control valve (η T2 ):

[0063] 1. According to the steam flow - high-pressure control valve opening function K = f1(η), calculate the steam flow K when the seawater temperature is (T) T = f1(η T ), and the steam flow K when the high-pressure control valve is at the opening limit (η t ): t = f1(η t );

[0064] Note: The steam flow - high-pressure control valve opening function is determined by the high-pressure control valve opening action test during commissioning;

[0065] 2. Find the steam flow (K1) corresponding to the maximum dead band opening of the high-pressure control valve;

[0066] 3. Calculate the maximum output when the seawater temperature is (T) based on the opening limit of the high-pressure steam admission control valve (η t )

[0067] Step Five: When the winter seawater temperature is (T), the measured value W of the maximum output of the steam turbine generator set is the minimum value among W T1 , W T2 , W3, that is, W = MIN{W T1 , W T2 , W3}.

[0068] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0069] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for calculating the maximum winter output of a nuclear power steam turbine generator set, characterized in that Including the following steps: Step S1: Search for the boundary limit conditions that affect the output of the nuclear power steam turbine generator set in the operation mode of the reactor coolant pump, and the boundary limit conditions include: the limit value Q of the primary loop thermal power of the reactor t , the limit value η of the opening of the high-pressure inlet steam regulating valve t , and the limit value W3 of the generator power; Step S2: Determine the seawater temperature T of the state to be measured, and find the relevant operating parameters when the seawater temperature was T last time. The relevant operating parameters include: the thermal power Q of the primary loop of the reactor when the seawater temperature is T T , the opening η of the high-pressure steam inlet control valve when the seawater temperature is T T , the electric power W of the generator when the seawater temperature is T T ; Step S3: Measure the maximum output W when the seawater temperature is T T1 ; Based on the limit value Q of the primary loop thermal power of the reactor t Measure the maximum output W when the seawater temperature is T T1 ; The method for measuring the maximum output power W when the measured seawater temperature is T T1 is specifically as follows: According to the calculation function of the thermal power correction factor of the primary loop of the reactor, calculate the thermal power correction factor C of the unit when the seawater temperature is T T ; Calculate the reactor primary loop thermal power limit Q based on the correction factor t Measure the maximum output when the seawater temperature is T The calculation method of the thermal power correction factor C T is as follows: According to the primary loop thermal power Q of the reactor when the recent seawater temperature is T T occupying the limit value Q of the primary loop thermal power of the reactor t ratio: Calculate the thermal power correction factor C of the unit at seawater temperature T according to the function C = f(Q') for calculating the thermal power correction factor of the primary loop of the reactor T = f(Q T '-1); Step S4: Measure the maximum output W when the seawater temperature is T T2 ; Based on the opening limit η of the high-pressure inlet steam control valve t Measure the maximum output W when the seawater temperature is T T2 ; The method for calculating the maximum output power W when the measured seawater temperature is T T2 is specifically as follows: Calculate the steam flow rate K at the seawater temperature T according to the steam flow rate - high-pressure regulating valve opening function T = f1(η T ), and the steam flow rate K when the high-pressure regulating valve is at the opening limit η t ; t = f1(η t ); According to the above function, find the steam flow rate K1 corresponding to the maximum dead band opening of the high-pressure regulating valve; Based on the opening limit η of the high-pressure admission control valve t , calculate the maximum output when the seawater temperature is T Step S5: When the winter seawater temperature is T, the measured maximum output of the steam turbine generator set W is W T1 , W T2 , the minimum value among W T1 , W T2 , W3}, that is, W = MIN{W 2. The measurement method according to claim 1, wherein The steam flow rate - high-pressure regulating valve opening function is determined by the high-pressure regulating valve opening action test during commissioning.

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