CN110909505A - Transient temperature field calculation method of nuclear power plant fatigue monitoring and life evaluation system - Google Patents
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Abstract
The invention discloses a transient temperature field calculation method for a nuclear power plant fatigue monitoring and life evaluation system, which reads primary loop system fluid temperature data T acquired by a digital control system of a power plant from a power plant database through a system interfacewAnd (t) as the input of transient temperature field calculation, calculating the temperature transient of the inner wall surface of the cylindrical shell or the spherical shell through a temperature field equation, and taking the temperature transient as the input of subsequent thermal stress calculation. Has the advantages that: the invention is suitable for solving the transient temperature field of nuclear power plant equipment and pipelines, and adopts the transient temperature field of a cylindrical shell or a spherical shellThe method does not need to take the temperature of the structural wall surface as calculation input, so that a temperature measuring instrument does not need to be added on the outer wall surface of loop equipment or a pipeline, the influence of a fatigue monitoring system on the design and field arrangement of a power plant is reduced, and the construction and maintenance cost of the system is reduced.
Description
Technical Field
The invention relates to the technical field of fatigue monitoring, service life assessment and operation maintenance of equipment and pipelines of a nuclear power plant, in particular to a transient temperature field calculation method of a fatigue monitoring and service life assessment system of the nuclear power plant.
Background
The nuclear power plant loop equipment and the pipeline are used as barriers for preventing reflex leakage, and the maintenance of structural integrity has important significance for ensuring the safe and stable operation of the reactor. The primary loop equipment and the pipeline work under the working conditions of high temperature and high pressure for a long time and experience complex pressure transient state and temperature transient state change, so the fatigue is one of the main failure mechanisms of the primary loop equipment and the pipeline.
The fatigue monitoring and life evaluating system for the nuclear power plant is an online monitoring system developed for monitoring the fatigue states of a loop device and a pipeline in real time, and calculates and provides a fatigue damage coefficient considering and not considering the influence of a coolant environment and a fatigue result of a sensitive part of the monitoring device and the pipeline through the acquired actual operation data information of the nuclear power plant, so that the fatigue lives of the device and the pipeline are evaluated.
For primary loop equipment and piping, thermal stress is one of the important factors that contribute to fatigue failure of the structure. Determining the transient temperature fields of the equipment and the pipeline is a key step for calculating the thermal stress in the structure, further carrying out fatigue analysis and evaluating the fatigue states of the equipment and the pipeline.
At present, a plurality of fatigue monitoring systems of the nuclear power plant are put into use abroad, wherein the fatigue monitoring systems which are used more frequently mainly comprise FatiguePro, WESTEMS, FAMOS and SACOR, and the FASTEMS is shown in a table 1. In China, except for the product (FAMOLES) for monitoring the fatigue and evaluating the service life of the nuclear power plant, the application of the same kind of product is not seen, and related patents and patent applications mainly comprise a nuclear power plant fatigue monitoring system and a method, a steam generator online fatigue life monitoring device and a method, a pipeline tee joint area online fatigue life monitoring device and a method, and a method for online monitoring the fatigue damage of nuclear-grade equipment and pipelines, which are shown in a table 2.
TABLE 1 foreign developed summary table of fatigue monitoring system of nuclear power plant
TABLE 2 domestic nuclear power plant fatigue monitoring system related patent summary table
In the applied monitoring system products abroad, both WESTEMSTM, FAMOS and SACOR need to be provided with thermocouples to acquire the temperature of the outer wall surface of the structure of the fatigue sensitive area, and the temperature of the outer wall surface of the structure and the temperature of the internal fluid medium are used as input to determine the structural temperature field of the fatigue evaluation position. The Fatiguepro can install thermocouples at the site of interest as required by the customer. For a power plant in service operation, a great deal of field upgrading and reconstruction are needed for installing the thermocouple, and the application cost of the fatigue monitoring system is greatly increased.
In the related patents of fatigue monitoring of the nuclear power plant in China, "a system and a method for monitoring the fatigue of the nuclear power plant" (patent 1), "a device and a method for monitoring the online fatigue life of a tee joint area of a pipeline" (patent application 3) need to arrange a temperature sensor/thermometer in a fatigue sensitive area of equipment or a pipeline, measure the temperature of the outer wall surface, and determine the temperature of the inner wall surface by taking the temperature of the outer wall surface as one of inputs.
"a steam generator online fatigue life monitoring device and method" (patent 2) need arrange the thermometer in the fatigue sensitive position of the steam generator, measure the metal wall temperature, and through the coolant temperature of primary side, secondary side saturated steam temperature and monitoring point stress component look-up table, a series of discrete temperature responses corresponding to time interval, the temperature difference between feedwater temperature and steam temperature is expanded into average temperature, linear temperature and non-linear temperature with Fourier series method to determine the thermal stress that the temperature load caused.
The patent application 4 discloses a method for monitoring fatigue damage of nuclear-grade equipment and pipelines on line, which takes fluid temperature and pressure data as input and applies a Green function and a high-dispersion temperature curve to obtain thermal stress.
The above patent 1, patent 2, and patent application 3 all relate to the arrangement of a temperature sensor/thermometer at a fatigue sensitive part of a device or a pipeline, which will change the original design, installation, and arrangement of a power plant device or a pipeline, and greatly increase the application cost of the fatigue monitoring system.
Patent 1 and patent application 3 use the metal outer wall surface temperature as one of the inputs and determine the metal inner wall surface temperature by calculation. The method needs to arrange a temperature sensor/thermometer to measure the temperature of the outer wall surface of the metal. This will change the original design, installation, arrangement of power plant equipment or pipeline, greatly increase fatigue monitoring system's application cost.
Patent 2, according to the structural characteristics of the steam generator, different methods are adopted for different fatigue sensitive parts to determine the thermal stress caused by the thermal load, and the method comprises the following steps: determining the thermal stress of the monitoring point through linear interpolation of the temperature and the stress component comparison table of the monitoring point; determining a stress of the temperature change using a series of discrete temperature responses corresponding to the time intervals; the temperature difference is decomposed into average temperature, linear temperature and nonlinear temperature by Fourier series, and then converted into corresponding thermal stress. In the methods, a temperature sensor/thermometer needs to be arranged to measure the temperature of the metal wall surface, the original design, installation and arrangement of power plant equipment need to be changed, and the application cost of the fatigue monitoring system is greatly increased. Further, none of these methods relates to a method of calculating the temperature of the metal inner wall surface.
Patent application 4 uses fluid temperature as input, and applies green's function and high-dispersion temperature curve to calculate thermal stress, and the method does not relate to a calculation method of metal inner wall surface temperature. Due to the inertia effect of heat transfer between the fluid and the metal, a certain difference exists between the temperature of the fluid and the temperature of the inner wall surface of the metal, the temperature of the fluid is directly applied to replace the temperature of the inner wall surface of the metal to calculate the thermal stress, and the accuracy of the stress calculation result is reduced.
In order to solve the problems, a transient temperature field calculation method of a nuclear power plant fatigue monitoring and life evaluation system is provided.
Disclosure of Invention
The invention aims to solve the problems in the background art and provides a transient temperature field calculation method of a nuclear power plant fatigue monitoring and life evaluation system.
In order to achieve the purpose, the invention adopts the following technical scheme: the transient temperature field calculation method of the nuclear power plant fatigue monitoring and life evaluation system comprises the following steps:
1) reading primary loop system fluid temperature data T acquired by a digital control system of a power plant from a power plant database through a system interfacew(t) storing in a system database as input for transient temperature field calculations;
2) reading a loop system fluid temperature data T from a system databasew(T) combining simulation analysis results of the design stage of the equipment and the pipeline to carry out temperature data T on the fluid of the loop system based on the positions of the equipment and pipeline fatigue monitoring evaluation points in the systemw(t) carrying out weighting processing to obtain the fluid at the fatigue monitoring and evaluating point of the equipment and the pipelineTemperature data Tw'(t)；
3) Reading preset geometric parameters, material parameters and thermal parameters of a structural model of the equipment and the pipeline from a system database, wherein the geometric parameters of the structural model comprise an inner diameter Ri and an outer diameter Ro of the shell, the material parameters comprise a thermal diffusion coefficient a and a thermal conductivity coefficient lambda of the structural material, and the thermal parameters comprise a heat exchange coefficient α;
4) 2) fluid temperature data Tw' (t) and 3) the geometric parameters Ri and Ro, the material parameters a and lambda and the thermal parameters α of the structural model of the equipment or the equipment are used as input, and the transient temperature field of the equipment or the pipeline and the transient temperature equation of the shell are calculated through the transient temperature field equation of the shell:
T＝T0 *(r) Ri≤r≤Ro,t＝0；
5) solving 4) a transient temperature field equation to obtain a structural transient temperature field T (r, T) of the shell;
6) and (4) taking r as Ri for the structure transient temperature T (r, T) to obtain a transient temperature Ti (T) for subsequent thermal stress calculation and fatigue evaluation of the system.
In the transient temperature field calculation method of the fatigue monitoring and life evaluation system of the nuclear power plant, the method for acquiring the temperature data of the fluid in the loop system in the step 1) is to actually measure the temperature of the fluid medium in the equipment or the pipeline through the thermocouple and deduce the temperature of the inner wall surface of the metal through the temperature of the fluid medium.
In the above method for calculating the transient temperature field of the fatigue monitoring and life evaluating system of the nuclear power plant, the shell structure in step 3) is a cylinder or a sphere.
In the above method for calculating the transient temperature field of the fatigue monitoring and life evaluating system of the nuclear power plant, the transient temperature in step 6) is the metal temperature of the corresponding equipment or the inner wall surface of the pipeline.
Compared with the prior art, the transient temperature field calculation method of the nuclear power plant fatigue monitoring and life evaluation system has the advantages that:
the method is suitable for solving the transient temperature field of the nuclear power plant equipment and the pipeline, adopts the transient temperature field equation of a cylindrical shell or a spherical shell, utilizes the fluid temperature data of a loop system to quickly calculate the transient temperature field, does not need the temperature of the structural wall surface as calculation input, does not need to add a temperature measuring instrument on the outer wall surface of the loop equipment or the pipeline, reduces the influence of a fatigue monitoring system on the design and the field arrangement of the power plant, and reduces the construction and maintenance cost of the system.
Drawings
FIG. 1 is a schematic flow chart of a method for calculating a transient temperature field of a fatigue monitoring and life assessment system for a nuclear power plant according to the present invention;
FIG. 2 is a schematic diagram comparing a transient temperature field calculation method and a temperature field calculation result of a finite element solution of the nuclear power plant fatigue monitoring and life evaluation system according to the present invention.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1-2, a method of calculating a transient temperature field of a nuclear power plant fatigue monitoring and life assessment system includes the steps of:
1) reading primary loop system fluid temperature data T acquired by a digital control system of a power plant from a power plant database through a system interfacew(t) storing in a system database as input for transient temperature field calculations;
2) reading a loop system fluid temperature data T from a system databasew(t) equipment and duct fatigue basedThe position of the labor monitoring evaluation point in the system is combined with the simulation analysis result of the equipment and pipeline design stage to carry out the simulation analysis on the temperature data T of the fluid in the loop systemw(T) carrying out weighting processing to obtain fluid temperature data T at the fatigue monitoring and evaluating points of the equipment and the pipelinew'(t)；
3) Reading preset geometric parameters, material parameters and thermal parameters of a structural model of the equipment and the pipeline from a system database, wherein the geometric parameters of the structural model comprise an inner diameter Ri and an outer diameter Ro of the shell, the material parameters comprise a thermal diffusion coefficient a and a thermal conductivity coefficient lambda of the structural material, and the thermal parameters comprise a heat exchange coefficient α;
4) 2) fluid temperature data Tw' (t) and 3) the geometric parameters Ri and Ro, the material parameters a and lambda and the thermal parameters α of the structural model of the equipment or the equipment are used as input, and the transient temperature field of the equipment or the pipeline and the transient temperature equation of the shell are calculated through the transient temperature field equation of the shell:
T＝T0 *(r) Ri≤r≤Ro,t＝0；
5) solving 4) a transient temperature field equation to obtain a structural transient temperature field T (r, T) of the shell;
6) and (4) taking r as Ri for the structure transient temperature T (r, T) to obtain a transient temperature Ti (T) for subsequent thermal stress calculation and fatigue evaluation of the system.
The method for collecting the fluid temperature data of the loop system in the step 1) comprises the steps of actually measuring the temperature of a fluid medium in equipment or a pipeline through a thermocouple, deducing the temperature of the inner wall surface of the metal through the temperature of the fluid medium, wherein the thermocouple is a temperature measuring element commonly used in a temperature measuring instrument, directly measures the temperature, converts a temperature signal into a thermal electromotive force signal, and converts the thermal electromotive force signal into the temperature of the measured medium through an electric instrument (a secondary instrument).
The shell structure in the step 3) is a cylinder or a sphere, and the primary equipment of a loop of the nuclear power plant, such as a reactor pressure vessel and a pipeline, basically belongs to a cylindrical barrel or a spherical shell structure.
The transient temperature in the step 6) is the metal temperature of the inner wall surface of the corresponding equipment or pipeline, and is approximately the same as the metal temperature of the outer wall surface of the equipment or pipeline.
In the invention, the primary equipment of a loop of the nuclear power plant, such as a reactor pressure vessel and a pipeline, basically belongs to a cylindrical barrel or spherical shell structure, so a transient temperature field can be deduced and solved by adopting a simplified structure model and an analytic method in a cylindrical coordinate system or a spherical coordinate system.
The temperature field calculation method of the nuclear power plant fatigue monitoring and service life evaluation system is different from a traditional method based on finite element numerical simulation, or a method for deducing the temperature of the inner wall surface by actually measuring the temperature of the outer wall surface of the metal through a thermocouple, and the transient temperature calculation of the inner wall surface of the structural metal is realized by adopting a transient temperature field equation of a cylindrical shell or a spherical shell.
By the aid of the method, the temperature of the inner wall surface of the metal of the equipment or pipeline fatigue monitoring evaluation point can be quickly and accurately calculated under the condition that a temperature measuring instrument of a loop system is not added, and the method can adapt to the quick online calculation criterion of an online monitoring system, and occupies less computer resources as much as possible.
By utilizing finite element numerical simulation, the temperature distribution of the cylindrical shell along the wall thickness direction can be calculated, the finite element solution is taken as a reference solution with higher precision, and the results of the calculation method and the finite element solution are compared as shown in figure 2, so that the difference between the two is very small.
The method is suitable for solving the transient temperature field of the nuclear power plant equipment and the pipeline, adopts the transient temperature field equation of a cylindrical shell or a spherical shell, utilizes the fluid temperature data of a loop system to quickly calculate the transient temperature field, does not need the temperature of the structural wall surface as calculation input, does not need to add a temperature measuring instrument on the outer wall surface of the loop equipment or the pipeline, reduces the influence of a fatigue monitoring system on the design and the field arrangement of the power plant, and reduces the construction and maintenance cost of the system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The transient temperature field calculation method of the nuclear power plant fatigue monitoring and life evaluation system comprises the following steps:
1) reading primary loop system fluid temperature data T acquired by a digital control system of a power plant from a power plant database through a system interfacew(t) storing in a system database as input for transient temperature field calculations;
2) reading a loop system fluid temperature data T from a system databasew(T) combining simulation analysis results of the design stage of the equipment and the pipeline to carry out temperature data T on the fluid of the loop system based on the positions of the equipment and pipeline fatigue monitoring evaluation points in the systemw(T) carrying out weighting processing to obtain fluid temperature data T at the fatigue monitoring and evaluating points of the equipment and the pipelinew'(t)；
3) Reading preset geometric parameters, material parameters and thermal parameters of a structural model of the equipment and the pipeline from a system database, wherein the geometric parameters of the structural model comprise an inner diameter Ri and an outer diameter Ro of the shell, the material parameters comprise a thermal diffusion coefficient a and a thermal conductivity coefficient lambda of the structural material, and the thermal parameters comprise a heat exchange coefficient α;
4) 2) fluid temperature data Tw' (t) and 3) the geometric parameters Ri and Ro, the material parameters a and lambda and the thermal parameters α of the structural model of the equipment or the equipment are used as input, and the transient temperature field of the equipment or the pipeline and the transient temperature equation of the shell are calculated through the transient temperature field equation of the shell:
T＝T0 *(r) Ri≤r≤Ro,t＝0；
5) solving 4) a transient temperature field equation to obtain a structural transient temperature field T (r, T) of the shell;
6) and (4) taking r as Ri for the structure transient temperature T (r, T) to obtain a transient temperature Ti (T) for subsequent thermal stress calculation and fatigue evaluation of the system.
2. The method for calculating the transient temperature field of the nuclear power plant fatigue monitoring and life evaluating system according to claim 1, wherein the method for collecting the temperature data of the fluid in the loop system in the step 1) is to actually measure the temperature of the fluid medium in the equipment or the pipeline through a thermocouple, and to deduce the temperature of the inner wall surface of the metal through the temperature of the fluid medium.
3. The method for calculating the transient temperature field of the nuclear power plant fatigue monitoring and life assessment system according to claim 1, wherein the shell structure in step 3) is a cylinder or a sphere.
4. The method for calculating the transient temperature field of the nuclear power plant fatigue monitoring and life span assessment system according to claim 1, wherein the transient temperature in the step 6) is the metal temperature of the corresponding equipment or the inner wall surface of the pipeline.
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