CN112651088A - Modeling method for dynamic characteristic analysis of pilot operated safety valve and obtained model - Google Patents

Modeling method for dynamic characteristic analysis of pilot operated safety valve and obtained model Download PDF

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CN112651088A
CN112651088A CN202011058481.3A CN202011058481A CN112651088A CN 112651088 A CN112651088 A CN 112651088A CN 202011058481 A CN202011058481 A CN 202011058481A CN 112651088 A CN112651088 A CN 112651088A
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piston
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CN112651088B (en
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袁晟毅
王宇翔
臧金光
李朋洲
郭松
罗世洪
田孝帅
张冬林
谭曙时
李晓钟
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Nuclear Power Institute of China
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Abstract

The invention discloses a modeling method and a model for analyzing dynamic characteristics of a pilot operated safety valve, wherein the step M1 is to build an overall simulation model sketch: building simulation models of sub-valves of the pilot-operated safety valve according to a pilot-operated safety valve schematic diagram, and assembling and connecting the simulation models of the sub-valves according to the pilot-operated safety valve principle to form a complete pilot-operated safety valve model; the establishing process of the simulation model of each sub-valve comprises the following steps: selecting a sub-model required by each sub-valve, wherein the sub-model is a one-dimensional numerical simulation model; establishing a corresponding valve cavity finite element numerical simulation model aiming at the valve cavity of each sub-valve, wherein the valve cavity finite element numerical simulation model is a two-dimensional or three-dimensional numerical simulation model; and butting the boundary condition data interaction channel interface of the valve cavity finite element numerical simulation model with the sub-model data interaction channel interface connected with the valve cavity finite element numerical simulation model to realize the conversion and interactive coupling of the one-dimensional data and the two-dimensional or three-dimensional data.

Description

Modeling method for dynamic characteristic analysis of pilot operated safety valve and obtained model
Technical Field
The invention relates to the technical field of simulation of a pilot operated safety valve and the technical field of simulation of the pilot operated safety valve in a primary circuit of a nuclear reactor, in particular to a modeling method and a model for dynamic characteristic analysis of the pilot operated safety valve.
Background
The pilot operated safety valve is an important device installed on fluid pressure systems such as equipment, containers or pipelines and used for overpressure protection, and particularly, a nuclear safety level safety valve used in a nuclear reactor primary circuit system is a key device for ensuring the safety of the pipelines and equipment of the nuclear reactor primary circuit system. The pilot operated safety valve mainly comprises a main valve and a pilot valve, and the main valve and the pilot valve can be connected in series or in parallel by other valves according to different action principles; meanwhile, for the modularized pilot operated safety valve, other types of valves can be mounted according to different application scenes.
As a safety valve consisting of a plurality of sub-valves, each sub-valve has obvious influence on the dynamic characteristic thereof; meanwhile, the internal structure of the pilot operated safety valve is complex, and the change of the structural parameters of the pilot operated safety valve has obvious influence on the dynamic characteristics of the pilot operated safety valve. Therefore, a large number of tests are required to obtain the dynamic characteristics of the pilot operated safety valve, so as to guide the product design, production, manufacture, installation and debugging of the pilot operated safety valve.
At present, the acquisition of dynamic characteristic data of a pilot operated safety valve is mainly carried out by tests, and a mature and available modeling analysis method is not available for a while. The test needs to consume a large amount of manpower, financial resources and time cost, and meanwhile, after the structural parameters are changed, the dynamic characteristics of the pilot operated safety valve are correspondingly changed, and the test needs to be carried out again.
Due to the diversity and the particularity of the pilot operated safety valve on the action principle, the composition form and the application scene, the traditional test method cannot accurately measure the dynamic characteristics of all the detail positions, and meanwhile, the common system modeling analysis method cannot carry out system modeling of the pilot operated safety valve.
Disclosure of Invention
The invention aims to provide a modeling method and a model for analyzing the dynamic characteristics of a pilot operated safety valve.
The invention is realized by the following technical scheme:
the modeling method for analyzing the dynamic characteristics of the pilot operated safety valve comprises the following processes:
step M1, building an overall simulation model sketch: building simulation models of sub-valves of the pilot-operated safety valve according to a pilot-operated safety valve schematic diagram, and assembling and connecting the simulation models of the sub-valves according to the pilot-operated safety valve principle to form a complete pilot-operated safety valve model;
the method is characterized in that the establishing process of the simulation model of each sub-valve comprises the following steps:
selecting a sub-model required by each sub-valve, wherein the sub-model is a one-dimensional numerical simulation model;
establishing a corresponding valve cavity finite element numerical simulation model aiming at the valve cavity of each sub-valve, wherein the valve cavity finite element numerical simulation model is a two-dimensional or three-dimensional numerical simulation model;
and butting the boundary condition data interaction channel interface of the valve cavity finite element numerical simulation model with the sub-model data interaction channel interface connected with the valve cavity finite element numerical simulation model to realize the conversion and interactive coupling of the one-dimensional data and the two-dimensional or three-dimensional data.
Also comprises the following steps of (1) preparing,
step M2, determining the simulation type of each sub-model: configuring a submodel solving type for a submodel in a pilot operated safety valve model;
step M3, determining parameters and boundary conditions: setting boundary condition parameters of a pilot operated safety valve model according to external given parameters of the pilot operated safety valve;
step M4, forming a simulation model file: compiling a pilot safety valve model with a sub-model solving type and boundary condition parameters to form a simulation model file;
step M5, setting a simulation solver: setting parameters of a simulation solver for the simulation model file;
step M6, obtaining a dynamic characteristic curve of the pilot operated safety valve through simulation: and D, performing simulation calculation by using the simulation solver obtained in the step M5, and drawing a dynamic characteristic curve of the pilot operated safety valve according to a simulation real-time output result.
The required submodel is selected from the determined required model base, and the required model base determines the model base required by modeling according to the application scene and the discharge medium of the pilot operated safety valve;
the sub-model library comprises: hydraulic sub-model library, pneumatic sub-model library, two-phase flow sub-model library, heat transfer sub-model library, mechanical sub-model library and signal/logic control sub-model library.
Establishing a corresponding valve cavity finite element numerical simulation model comprises the following steps:
step 2.1: determining a valve cavity for establishing finite element analysis;
step 2.2: drawing a two-dimensional or three-dimensional valve cavity geometric model according to a schematic diagram of a pilot operated safety valve and the calculation precision requirement;
step 2.3: discretizing the valve cavity geometric model according to the valve cavity flowing state and the flowing medium calculation precision requirement to generate a grid file;
step 2.4: setting initial conditions, and establishing a boundary condition data interaction channel interface of the valve cavity finite element numerical simulation model.
The sub-valve includes: pilot valves and main valves and auxiliary valves or/and functional valves fitted on the pilot operated safety valves and having different purposes.
Step M3, determining parameters and boundary conditions includes:
step M3.1: determining the relevant values of all mechanical structures and movable parts in the model according to a principle diagram of a pilot operated safety valve, wherein the relevant values comprise: valve flap mass, spring force, valve cavity volume, hole or flow channel size.
Step M3.2: setting initialization state parameters according to the pre-test state, comprising: temperature/pressure of each valve cavity, initial sealing force of the valve clack and initial condition of a discharge medium source.
Step M3.3: setting test boundary conditions according to the capability of the test device to be simulated and test data acquired by a field test, wherein the test boundary conditions comprise: a source condition of the discharge medium, an outlet ambient condition of the main and pilot valves, and other sub-valve boundary conditions.
Step M3.4: in special cases, logic control signal setting is performed: because the model library is incomplete, part of the structure needs to be simulated by a logic control signal, and the control signal is set according to a physical model formula of the structure.
And M5, setting solving parameters of the sub-model and the valve cavity finite element numerical simulation model in the simulation solver, and ensuring that resolving nodes of the two solvers are consistent, effective and synchronous.
Step M6, obtaining dynamic characteristic curve of the pilot operated safety valve through simulation: the dynamic characteristic curve of the pilot operated safety valve at least comprises a curve of a parameter C changing along with time, wherein the parameter C comprises: the pressure of the discharge medium source, the pressure in front of the pilot safety valve, the opening height of the main valve/pilot valve of the pilot safety valve, the displacement of the main valve/pilot valve of the pilot safety valve, and the opening height and the chamber pressure of other sub-valves.
Therefore, the complete description of the steps M1-M6 is as follows:
a modeling method for analyzing dynamic characteristics of a pilot operated safety valve mainly comprises the following steps:
step 1: a required model library is determined. And determining a model base required by modeling according to the application scene and the discharge medium of the pilot operated safety valve.
Step 2: establishing a finite element numerical simulation model of the key flow passage (valve cavity). According to the principle diagram of the pilot operated safety valve, a two-dimensional or three-dimensional numerical simulation model is established for the flow passage structure which is concerned seriously.
And step 3: and (5) building a draft of the overall simulation model. According to a principle diagram of the pilot safety valve and a selected model library, selecting a required sub-model, building a simulation model of each sub-valve, and assembling and connecting the sub-valves according to the principle diagram to form a complete pilot safety valve model.
And 4, step 4: and determining the simulation type of each sub-model. And comprehensively considering the requirements of the structure, such as the flow state, the simulation precision and the like, and selecting the sub-model solving type meeting the requirements.
And 5: parameters and boundary conditions are determined. And setting boundary condition parameters of the simulation model according to external given parameters such as equipment parameters of the pilot operated safety valve, performance parameters of the test device and the like.
Step 6: and finishing the modeling work, and compiling to form a simulation model file.
And 7: and setting parameters of the simulation solver.
And 8: and performing simulation calculation, and drawing a dynamic characteristic curve of the pilot operated safety valve according to a simulation real-time output result.
The sub-model library in the step 1 comprises: hydraulic sub-model library, pneumatic sub-model library, two-phase flow sub-model library, heat transfer sub-model library, mechanical sub-model library, signal/logic control sub-model library, etc.
The establishment of the finite element analysis model in step 2 should be determined according to actual requirements, and this step can be skipped for the flow channel structure without special attention.
The establishing of the finite element analysis model in the step 2 comprises the following steps:
step 2.1: and determining the flow channel required to establish the finite element analysis.
Step 2.2: and drawing a two-dimensional or three-dimensional flow channel geometric model according to a principle drawing of the pilot operated safety valve, a design drawing and calculation precision requirements.
Step 2.3: discretizing the geometric model of the flow channel according to the flow state of the flow channel, the calculation precision of the flow medium and other requirements to generate a grid file.
Step 2.4: setting initial conditions and establishing a boundary condition data interaction channel interface.
The sub-valve in step 3 comprises: the pilot valve, the main valve and the auxiliary valve and the functional valve which are assembled on the pilot safety valve and have different purposes.
And 3, in the process of building the complete simulation model sketch, if a finite element analysis model exists, a boundary condition data interaction channel interface of the finite element analysis model needs to be in butt joint with a sub-model data interaction channel interface connected with the finite element analysis model, so that conversion and interaction of one-dimensional data and two-dimensional/three-dimensional data are realized.
The determining parameters and boundary conditions in step 5 include:
step 5.1: determining relevant values of all mechanical structures and movable parts in the model according to a design drawing of a pilot operated safety valve, wherein the relevant values comprise: valve flap mass, spring force, cavity volume, hole or flow channel size, etc.
Step 5.2: according to the pre-test state, setting model initialization state parameters, comprising: the respective chamber temperature/pressure, the flap initial sealing force, the discharge medium source initial conditions, etc.
Step 5.3: setting test boundary conditions according to the capability of the test device to be simulated and test data acquired by a field test, wherein the test boundary conditions comprise: a discharge medium source condition, a main valve/pilot valve outlet ambient condition, and other sub-valve boundary conditions.
Step 5.4: and setting a logic control signal. In a special case, because the model library is incomplete, part of the structure needs to be simulated by logic control signals, and the control signals are set according to a physical model formula of the structure.
In the step 7, if a finite element analysis model exists in the set solver parameters, the solution parameters of the model need to be set at the same time, and the solution nodes of the two solvers are ensured to be consistent, effective and synchronous.
The physical quantity related to the dynamic characteristic curve in step 8 is different from the pilot operated safety valves with different principles, but at least comprises the following curve of the parameters changing along with time: the pressure of the discharge medium source, the pressure in front of the pilot safety valve, the opening height of the main valve/pilot valve of the pilot safety valve, the displacement of the main valve/pilot valve of the pilot safety valve, and the opening height and the chamber pressure of other sub-valves.
A dynamic characteristic analysis model of a pilot operated safety valve,
the dynamic characteristic analysis model of the pilot operated safety valve is arranged in a loop of the nuclear reactor according to the layout of the pilot operated safety valve; the dynamic characteristic analysis model of the pilot operated safety valve is a two-phase flow simulation model at the moment;
the layout of the pilot operated safety valve in a nuclear reactor primary circuit is as follows: the pilot operated safety valve comprises a main valve and a pilot valve, wherein the pilot valve comprises an auxiliary valve and a driving valve, a voltage stabilizer in a loop of the nuclear reactor is communicated with a valve inlet of the main valve, and the voltage stabilizer is communicated with a pressure sensing end of the auxiliary valve through a pilot valve pressure sensing pipe; the pressure relief end of the main valve is communicated with an inner chamber of the driving valve through a main valve upper cavity pressure relief pipeline, the inner chamber of the driving valve is communicated with a pressure relief box in a loop of the nuclear reactor, and a valve outlet of the main valve is communicated with the pressure relief box through a main valve pressure relief pipeline;
the analysis model for the dynamic characteristics of the pilot operated safety valve comprises the following steps: the system comprises a voltage stabilizer simulation system corresponding to a voltage stabilizer, a pressure relief tank simulation system corresponding to a pressure relief tank, and a pilot safety valve simulation model corresponding to a pilot safety valve for communicating the voltage stabilizer and the pressure relief tank;
the pilot operated safety valve simulation model comprises: a simulation model of a main valve sub-valve corresponding to a main valve, a simulation model of a driven valve sub-valve corresponding to a driven valve, a simulation model of an auxiliary valve sub-valve corresponding to an auxiliary valve; the simulation model of the main sub-valve comprises: the system comprises a main valve action simulation subsystem, a main valve additional backpressure balance structure, a main valve flow simulation subsystem and a main valve self-tightening sealing subsystem; the simulation model for driving the valve of the valve comprises: the simulation subsystem of driving valve action, the extra backpressure balanced structure of driving valve, the simulation subsystem that drives valve flow, the sealed subsystem of driving valve self-tightening formula, the simulation model who assists the valve sub-valve includes: the auxiliary valve operation simulation subsystem, the auxiliary valve additional backpressure balance structure and the auxiliary valve flow simulation subsystem;
the additional back pressure balance structure of the main valve is coupled with a valve module with a valve seat and a valve clack in the main valve action simulation subsystem in a back pressure mode, the additional back pressure balance structure of the driving valve is coupled with a valve module with the valve seat and the valve clack in the driving valve action simulation subsystem in a back pressure mode, and the additional back pressure balance structure of the auxiliary valve is coupled with a valve module with the valve seat and the valve clack in the auxiliary valve action simulation subsystem in a back pressure mode; the back pressure coupling is designed by coupling the pressure direction of a valve module with a valve seat valve clack and the pressure direction of an additional back pressure balance structure of a main valve together, so as to balance and make up the calculation deviation caused by a special use mode of the structure;
the valve clacks of the main valve and the driving valve adopt a self-tightening sealing structure, the forced sealing is realized by using the system pressure in the closing state of the valve, a signal/logic control sub-model library is used for establishing a main valve self-tightening sealing subsystem and a driving valve self-tightening sealing subsystem, and the main valve self-tightening sealing subsystem is in data interactive coupling with a main valve flow simulation subsystem and a main valve action simulation subsystem; the driving valve self-tightening sealing subsystem is in data cross coupling with the driving valve flow simulation subsystem and the driving valve action simulation subsystem; the self-tightening sealing force of the main valve is determined by the main valve self-tightening sealing subsystem through calculation of a physical model formula according to pressure data of the main valve flow simulation subsystem and the valve clack opening and closing state of the main valve action simulation subsystem; the self-tightening sealing force of the driving valve is determined by the self-tightening sealing subsystem of the driving valve through calculation of a physical model formula according to pressure data of the flow simulation subsystem of the driving valve and the opening and closing state of a valve clack of the motion simulation subsystem of the driving valve.
The flow directions of the medium in the main valve flow simulation subsystem, the driven valve flow simulation subsystem and the auxiliary valve flow simulation subsystem are arranged in a loop of the nuclear reactor according to the layout of a pilot safety valve;
at this time, the actual flow direction of the medium is not in accordance with the default flow direction of the medium in the simulation model of the main valve sub-valve, the simulation model of the driving valve sub-valve, and the simulation model of the sub-valve, and the extra back pressure balance structure of the main valve, the extra back pressure balance structure of the driving valve, and the extra back pressure balance structure of the sub-valve, which do not correspond to the solid structure, are respectively added to the simulation model of the main valve sub-valve, the simulation model of the driving valve sub-valve, and the simulation model of the sub-valve, and the extra back pressure balance structure is used to eliminate the influence of extra back pressure generated in.
The main valve action simulation subsystem and the driving valve action simulation subsystem both comprise:
a valve module with a valve seat and a valve clack, a mass block, a piston cavity module without a spring, and a piston cavity module with a spring;
the auxiliary valve action simulation subsystem comprises: the piston cavity module comprises a valve module with a valve seat valve clack, a mass block and a piston cavity module with a spring;
the piston cavity module without the spring and the piston cavity module with the spring are jointly formed and used for simulating a piston structure with a pre-tightening spring, and the piston structure with the pre-tightening spring comprises; the piston cavity, a pre-tightening spring arranged in the piston cavity and a piston; the piston cavity module with the spring is used for simulating a piston cavity part above the piston, and the piston cavity part above the piston is provided with a pre-tightening spring; the piston cavity module without the spring is used for simulating a piston cavity part below the piston, and the piston cavity part below the simulated piston is not provided with a pre-tightening spring;
the mass block is used for simulating the mass sum of all moving parts in the opening and closing process of the valve, and the mass sum of all the moving parts comprises the mass sum of the valve clack, the valve rod and the piston;
the valve module with the valve seat valve clack is used for simulating a combined structure of the valve seat valve clack;
the parameters of the pre-tightening spring can be set in a piston cavity module with a spring, and the self-tightening sealing force is generated by a piston structure and finally acts on the valve clack through the valve rod to form sealing with the valve seat.
The main valve flow simulation subsystem and the driven valve flow simulation subsystem both comprise:
a piston upper cavity interface module, a piston upper cavity module, a gap or pore channel module between the piston upper cavity and the piston lower cavity, a piston lower cavity and valve cavity module, a valve outlet module and a valve inlet module,
the auxiliary valve flow simulation subsystem comprises:
the piston upper cavity interface module, the piston upper cavity module, a gap or pore channel module between the upper cavity and the lower cavity of the piston, the valve outlet module and the valve inlet module;
the piston upper cavity interface module is used for simulating a piston cavity connected with the pilot valve and the main valve;
the piston upper cavity module is used for simulating a piston cavity part above the piston;
the gap or pore canal between the upper cavity and the lower cavity of the piston is used for simulating the gap between the piston and the side wall or is used for simulating a piston hole on the piston for adjusting the pressure of the upper cavity and the lower cavity of the piston; the number of gaps or pore passages between the upper and lower cavities of the piston in the main valve flow simulation subsystem and the driven valve flow simulation subsystem is set according to the actual condition of equipment; the number of gaps or pore passages between the upper cavity and the lower cavity of the piston in the auxiliary valve flow simulation subsystem is 1;
the piston lower cavity and the valve cavity module are used for simulating the part of the piston cavity below the piston, which is connected with the valve cavity;
the valve outlet module is an open container model or a discharge medium receiving container and adopts pressure identification;
the valve inlet module is a pressure source model or a discharge medium source module and adopts pressure identification.
The model is built according to a modeling method aiming at the state that the pilot operated safety valve is arranged in a loop of the nuclear reactor, so that the characteristic analysis of the pilot operated safety valve is conveniently carried out in the loop of the nuclear reactor; more particularly: the pilot safety valve in the invention is characterized in that the pilot safety valve is connected in a loop of the nuclear reactor in a special manner, so that an output port of a traditional main valve is inverted into an input port, and an input port of the traditional main valve is inverted into an output port, therefore, the medium flow direction in the main valve flows from the upper side of the valve flap to the lower side of the valve seat, and the default flow direction in the model flows from the lower side of the valve seat to the upper side of the valve flap, namely the actual flow direction is opposite to the default flow direction, therefore, extra back pressure influence calculation is generated on the valve flap, and therefore, an extra back pressure balance structure. The drive valve and the auxiliary valve are similar to the main valve, and similar structures are added to eliminate the influence.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic flow chart of a modeling method for analyzing dynamic characteristics of a pilot operated safety valve.
FIG. 2 is a schematic diagram of a main valve structure of a pressure-relief open-type pilot operated safety valve
FIG. 3 is a simulation model diagram of a main valve of a pressure-relief open-type pilot operated safety valve
FIG. 4 is a schematic diagram of a main valve structure of another pressure relief open type pilot operated safety valve
FIG. 5 is a simulation model of the main valve of another pressure-relief open-type pilot operated safety valve
FIG. 6 is a schematic diagram of a pilot operated safety valve
FIG. 7 is a diagram of a two-phase flow-down simulation model of a pilot operated safety valve
Reference numerals in the drawings denote:
1-valve inlet, 2-valve seat, 3-valve flap, 4-valve rod, 5-piston, 6-pre-tightening spring, 7-piston cavity, 8-valve outlet,
9-a valve module with a valve seat and a valve flap, 10-a mass block, 11-a piston cavity module without a spring, 12-a piston cavity module with a spring, 13-a piston upper cavity interface module, 14-a piston upper cavity, 15-a gap or pore channel module between the piston upper cavity and the piston lower cavity, 16-a piston lower cavity and a valve cavity module, 17-a valve outlet module, 18-a valve inlet module,
19-main valve pressure relief pipeline, 20-main valve, 21-main valve upper cavity pressure relief pipeline, 22-pilot valve pressure sensing pipe, 23-pressure sensing end, 24-auxiliary valve discharge port, 25-auxiliary valve, 26-driving valve, 27-pilot valve, 28-voltage stabilizer, 29-pressure relief box,
30-main valve flow simulation subsystem, 31-voltage stabilizer simulation system, 32-main valve self-tightening sealing subsystem, 33-driving valve self-tightening sealing subsystem, 34-auxiliary valve action simulation subsystem, 35-auxiliary valve flow simulation subsystem, 36-driving valve action simulation subsystem, 37-driving valve flow simulation subsystem, 38-main valve action simulation subsystem, 39-main valve extra backpressure balance structure, 40-driving valve extra backpressure balance structure, 41-auxiliary valve extra backpressure balance structure and 42-pressure relief box simulation system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in figure 1 of the drawings, in which,
the modeling method for analyzing the dynamic characteristics of the pilot operated safety valve comprises the following processes:
step M1, building an overall simulation model sketch: building simulation models of sub-valves of the pilot-operated safety valve according to a pilot-operated safety valve schematic diagram, and assembling and connecting the simulation models of the sub-valves according to the pilot-operated safety valve principle to form a complete pilot-operated safety valve model;
the method is characterized in that the establishing process of the simulation model of each sub-valve comprises the following steps:
selecting a sub-model required by each sub-valve, wherein the sub-model is a one-dimensional numerical simulation model;
establishing a corresponding valve cavity finite element numerical simulation model aiming at the valve cavity of each sub-valve, wherein the valve cavity finite element numerical simulation model is a two-dimensional or three-dimensional numerical simulation model;
and butting the boundary condition data interaction channel interface of the valve cavity finite element numerical simulation model with the sub-model data interaction channel interface connected with the valve cavity finite element numerical simulation model to realize the conversion and interactive coupling of the one-dimensional data and the two-dimensional or three-dimensional data.
Also comprises the following steps of (1) preparing,
step M2, determining the simulation type of each sub-model: configuring a submodel solving type for a submodel in a pilot operated safety valve model;
step M3, determining parameters and boundary conditions: setting boundary condition parameters of a pilot operated safety valve model according to external given parameters of the pilot operated safety valve;
step M4, forming a simulation model file: compiling a pilot safety valve model with a sub-model solving type and boundary condition parameters to form a simulation model file;
step M5, setting a simulation solver: setting parameters of a simulation solver for the simulation model file;
step M6, obtaining a dynamic characteristic curve of the pilot operated safety valve through simulation: and D, performing simulation calculation by using the simulation solver obtained in the step M5, and drawing a dynamic characteristic curve of the pilot operated safety valve according to a simulation real-time output result.
The required submodel is selected from the determined required model base, and the required model base determines the model base required by modeling according to the application scene and the discharge medium of the pilot operated safety valve;
the sub-model library comprises: hydraulic sub-model library, pneumatic sub-model library, two-phase flow sub-model library, heat transfer sub-model library, mechanical sub-model library and signal/logic control sub-model library.
Establishing a corresponding valve cavity finite element numerical simulation model comprises the following steps:
step 2.1: determining a valve cavity for establishing finite element analysis;
step 2.2: drawing a two-dimensional or three-dimensional valve cavity geometric model according to a schematic diagram of a pilot operated safety valve and the calculation precision requirement;
step 2.3: discretizing the valve cavity geometric model according to the valve cavity flowing state and the flowing medium calculation precision requirement to generate a grid file;
step 2.4: setting initial conditions, and establishing a boundary condition data interaction channel interface of the valve cavity finite element numerical simulation model.
The sub-valve includes: pilot valves and main valves and auxiliary valves or/and functional valves fitted on the pilot operated safety valves and having different purposes.
Step M3, determining parameters and boundary conditions includes:
step M3.1: determining the relevant values of all mechanical structures and movable parts in the model according to a principle diagram of a pilot operated safety valve, wherein the relevant values comprise: valve flap mass, spring force, valve cavity volume, hole or flow channel size.
Step M3.2: setting initialization state parameters according to the pre-test state, comprising: temperature/pressure of each valve cavity, initial sealing force of the valve clack and initial condition of a discharge medium source.
Step M3.3: setting test boundary conditions according to the capability of the test device to be simulated and test data acquired by a field test, wherein the test boundary conditions comprise: a source condition of the discharge medium, an outlet ambient condition of the main and pilot valves, and other sub-valve boundary conditions.
Step M3.4: in special cases, logic control signal setting is performed: because the model library is incomplete, part of the structure needs to be simulated by a logic control signal, and the control signal is set according to a physical model formula of the structure.
And M5, setting solving parameters of the sub-model and the valve cavity finite element numerical simulation model in the simulation solver, and ensuring that resolving nodes of the two solvers are consistent, effective and synchronous.
Step M6, obtaining dynamic characteristic curve of the pilot operated safety valve through simulation: the dynamic characteristic curve of the pilot operated safety valve at least comprises a curve of a parameter C changing along with time, wherein the parameter C comprises: the pressure of the discharge medium source, the pressure in front of the pilot safety valve, the opening height of the main valve/pilot valve of the pilot safety valve, the displacement of the main valve/pilot valve of the pilot safety valve, and the opening height and the chamber pressure of other sub-valves.
Example 2
As shown in fig. 1, when a main valve connection relationship needs to be considered during modeling and specific application-oriented modeling is implemented, a modeling method for analyzing dynamic characteristics of a pilot operated safety valve includes the following steps:
step 1: a required model library is determined. And determining a model base required by modeling according to the application scene and the discharge medium of the pilot operated safety valve.
Step 2: and establishing a finite element numerical simulation model of the key flow channel. According to the principle diagram of the pilot operated safety valve, a two-dimensional or three-dimensional numerical simulation model is established for the flow passage structure which is concerned seriously.
And step 3: and (5) building a draft of the overall simulation model. According to a principle diagram of the pilot safety valve and a selected model library, selecting a required sub-model, building a simulation model of each sub-valve, and assembling and connecting the sub-valves according to the principle diagram to form a complete pilot safety valve model.
And 4, step 4: and determining the simulation type of each sub-model. And comprehensively considering the requirements of the structure, such as the flow state, the simulation precision and the like, and selecting the sub-model solving type meeting the requirements.
And 5: parameters and boundary conditions are determined. And setting boundary condition parameters of the simulation model according to external given parameters such as equipment parameters of the pilot operated safety valve, performance parameters of the test device and the like.
Step 6: and finishing the modeling work, and compiling to form a simulation model file.
And 7: and setting parameters of the simulation solver.
And 8: and performing simulation calculation, and drawing a dynamic characteristic curve of the pilot operated safety valve according to a simulation real-time output result.
The sub-model library in the step 1 comprises: hydraulic sub-model library, pneumatic sub-model library, two-phase flow sub-model library, heat transfer sub-model library, mechanical sub-model library, signal/logic control sub-model library, etc.
The establishment of the finite element analysis model in step 2 should be determined according to actual requirements, and this step can be skipped for the flow channel structure without special attention.
The establishing of the finite element analysis model in the step 2 comprises the following steps:
step 2.1: and determining the flow channel required to establish the finite element analysis.
Step 2.2: and drawing a two-dimensional or three-dimensional flow channel geometric model according to a principle drawing of the pilot operated safety valve, a design drawing and calculation precision requirements.
Step 2.3: discretizing the geometric model of the flow channel according to the flow state of the flow channel, the calculation precision of the flow medium and other requirements to generate a grid file.
Step 2.4: setting initial conditions and establishing a boundary condition data interaction channel interface.
The sub-valve in step 3 comprises: the pilot valve, the main valve and the auxiliary valve and the functional valve which are assembled on the pilot safety valve and have different purposes.
And 3, in the process of building the complete simulation model sketch, if a finite element analysis model exists, a boundary condition data interaction channel interface of the finite element analysis model needs to be in butt joint with a sub-model data interaction channel interface connected with the finite element analysis model, so that conversion and interaction of one-dimensional data and two-dimensional/three-dimensional data are realized.
The determining parameters and boundary conditions in step 5 include:
step 5.1: determining relevant values of all mechanical structures and movable parts in the model according to a design drawing of a pilot operated safety valve, wherein the relevant values comprise: valve flap mass, spring force, cavity volume, hole or flow channel size, etc.
Step 5.2: according to the pre-test state, setting model initialization state parameters, comprising: the respective chamber temperature/pressure, the flap initial sealing force, the discharge medium source initial conditions, etc.
Step 5.3: setting test boundary conditions according to the capability of the test device to be simulated and test data acquired by a field test, wherein the test boundary conditions comprise: a discharge medium source condition, a main valve/pilot valve outlet ambient condition, and other sub-valve boundary conditions.
Step 5.4: and setting a logic control signal. In a special case, because the model library is incomplete, part of the structure needs to be simulated by logic control signals, and the control signals are set according to a physical model formula of the structure.
In the step 7, if a finite element analysis model exists in the set solver parameters, the solution parameters of the model need to be set at the same time, and the solution nodes of the two solvers are ensured to be consistent, effective and synchronous.
The physical quantity related to the dynamic characteristic curve in step 8 is different from the pilot operated safety valves with different principles, but at least comprises the following curve of the parameters changing along with time: the pressure of the discharge medium source, the pressure in front of the pilot safety valve, the opening height of the main valve/pilot valve of the pilot safety valve, the displacement of the main valve/pilot valve of the pilot safety valve, and the opening height and the chamber pressure of other sub-valves.
In particular:
the simulation model subsystem comprises a pilot valve subsystem, a main valve subsystem, an auxiliary valve subsystem, a test loop subsystem and the like. According to the functional division, the simulation model subsystem comprises an action simulation subsystem, a flow simulation subsystem, a signal/logic control subsystem and the like. Each subsystem is composed of sub-model components in a sub-model library, wherein the sub-model library comprises but is not limited to a hydraulic sub-model library, a pneumatic sub-model library, a two-phase flow sub-model library, a heat transfer sub-model library, a mechanical sub-model library, a signal/logic control sub-model library and the like.
In the step 3, if the finite element analysis structure does not exist, the solving process is directly calculated and solved by the system simulation platform; if the finite element analysis structure exists, the finite element solution tool or the commercial software is called by the system simulation platform to calculate and solve the submodel of the finite element analysis, and the rest submodels are directly calculated and solved by the system simulation platform. The finite element analysis structure can adopt commercial numerical simulation software to establish a finite element analysis model aiming at a specific object independently, can also directly use a two-dimensional or three-dimensional sub model preset in a sub model library and carry out actual solution, a solution data access is connected with a component data access associated with the upstream and downstream of the component in a system simulation model, and data conversion and interaction can be realized, so that the modeling and solution method for carrying out system simulation integrally and finite element numerical simulation locally is provided. And (4) uniformly setting the physical parameters of the finite element analysis model and the parameters of the solver through system simulation software.
When the actual flowing direction of the medium is consistent with the default flowing direction of the module, modeling can be directly carried out through module construction, and the simulation calculation of the self-tightening sealing force is realized by utilizing the piston structure. When the actual flowing direction of the medium is not consistent with the default flowing direction of the modules, unrealistic balance modules can be added in the model, factors influencing the simulation correctness are offset, and the logic control subsystem is used for realizing the simulation calculation of the self-tightening seal.
When the flowing working medium is two-phase flow or multi-directional flow, flow simulation and action simulation can be respectively adopted for modeling, and simulation of medium discharge and opening and closing actions of the pilot operated safety valve is realized in a model coupling mode.
The dynamic simulation model system is composed of different subsystems by adopting a hierarchical division mode, each subsystem is composed of a sub-model, and the sub-models are selected from a plurality of sub-models in a model library. The visual mode of pulling and building is adopted, so that visual modeling can be directly carried out by utilizing the structural model of the corresponding model base through simple structural division according to the structural principle sketch of the pilot safety valve, and the modeling inspection and the structural understanding are facilitated.
Example 3:
for a pilot operated safety valve with a pressure relief opening principle, as shown in fig. 2, after the upper piston chamber 7 is relieved, the valve clack 3, the valve rod 4 and the piston 5 move under the action of the pressure difference between the upper and lower piston chambers to open the main valve. The method for constructing the model sketch can be carried out in a mode as shown in figure 3.
The default flow direction of the valve module with valve clack 9 is that the default flow direction of the medium flows from the valve outlet 17 of the model default, passes through the piston lower cavity and the valve cavity 16, and then flows out from the valve inlet 18 of the model default after passing through the valve module with valve clack 9. This flow direction is opposite to the media flow direction in fig. 3, and the flow direction in the model is reversed, resulting in no additional back pressure being generated.
After the flow direction of the model is reversed, the valve module 9 with the valve clack is always influenced by back pressure, which is not consistent with the actual situation, and the influence of the back pressure is eliminated by a back pressure balance structure 39 with the same area.
Because the pilot operated safety valve of the pressure relief open type principle has the characteristic of self-tightening sealing, the force value is set and calculated through the main valve self-tightening sealing subsystem 32, including the magnitude and direction of the self-tightening sealing force and the existence condition of the self-tightening sealing force.
The mass 10 represents the sum of the masses of all moving parts in the opening and closing process of the valve, namely the sum of the masses of the valve clack 3, the valve rod 4 and the piston 5.
The piston chamber module 11 without spring and the piston chamber module 12 with spring together form a piston arrangement with pretensioning spring, the relevant parameters of the pretensioning spring 6 of which can be set in the piston chamber module 12 with spring.
The gap or duct module 15 between the upper and lower chambers of the piston is used to simulate the gap between the piston and the sidewall, or to simulate the piston bore in the piston for adjusting the pressure of the upper and lower chambers of the piston. The number of the gaps or the pore channel modules 15 between the upper and the lower cavities of the piston is not fixed, and can be increased or decreased according to the number of the gaps or the pore channels. For structures without gaps and tunnels, the relevant parameters can be set to zero, or the dummy structure can be eliminated.
The valve inlet 18 and the valve outlet 17 are pressure source models, and can be changed into other containers or discharge medium modules according to the actual simulation structure.
The piston upper chamber interface module 13 represents the piston chamber pressure of the pilot valve connected to the main valve, and is replaced by a pilot valve model in the modeling process.
Example 4:
for the main valve of another pilot operated safety valve with pressure relief open principle, as shown in fig. 4, the lower piston cavity is of a bellows structure, the pressure of the lower piston cavity is consistent with the valve outlet, and the pressure of the upper piston cavity is consistent with the valve inlet. After the upper cavity of the piston cavity 7 is relieved, the pressure difference between the upper cavity and the lower cavity of the piston disappears, the self-tightening sealing force disappears at the same time, and the valve clack 3 drives the valve rod 4 and the piston 5 to move under the action of a valve inlet medium, so that the opening of the main valve is realized. The method for constructing the model sketch can be carried out in a mode as shown in figure 5.
In the valve module 9 with valve seat flaps, the default is that the medium flow direction flows in from the valve inlet module 18, passes through the piston lower cavity and the valve cavity module 16, and flows out from the valve outlet module 17. This flow direction coincides with the direction in which the medium flows from the lower side of the valve seat to the upper side of the valve seat in fig. 4, and no additional back pressure is generated, so that no additional back pressure balancing structure is required.
The mass 10 represents the sum of the masses of all moving parts during the opening and closing of the valve, i.e. the sum of the masses of the valve flap 3, the valve stem 4 and the piston 5.
The piston chamber module 11 without springs and the piston chamber module 12 with springs together form a piston structure with preloaded springs, and the relevant parameters of the preloaded springs 6 can be set in the piston chamber module 12 with springs. A self-tightening sealing force is generated by the piston structure and ultimately acts on the valve module 9 with the valve seat flap.
The valve inlet 18 and the valve outlet 17 are pressure source models, and can be changed into other containers or discharge medium modules according to the actual simulation structure.
The pressure of the piston upper chamber interface module 13 represents the pilot valve chamber pressure and corresponds to the piston chamber pressure of the pilot valve connected to the main valve, and this module is replaced by the pilot valve model in the modeling process.
Example 5:
for a pilot operated safety valve, as shown in fig. 6, when the discharge medium involves two-phase flow (such as water and steam), the model sketch construction method can be carried out in the way shown in fig. 7. The modeling mode is mainly characterized in that a flow sub-model is used for simulating a flow field, a motion sub-model is used for simulating the action of a valve, the two sub-models are used for carrying out real-time interaction by using simulation data mutually, the motion and flow simulation coupling of the whole safety valve is realized, meanwhile, a balance structure is used for eliminating the influence of extra back pressure, and the logic control is used for realizing the simulation calculation of self-tightening sealing.
When the medium pressure in the voltage stabilizer simulation system 31 rises to a set value in the closed state of the safety valve, the moving part of the auxiliary valve action simulation subsystem 34 pushes the valve flap to open under the action of the medium pressure, and an opening signal is synchronously transmitted to the auxiliary valve action simulation subsystem 35 to simulate the auxiliary valve flow field.
Along with the discharge of the medium in the auxiliary valve, the medium pressure in the driving valve flow simulation subsystem 37 changes, so that the valve clack of the driving valve action simulation subsystem 36 is opened under the action of the medium pressure, and an opening signal is synchronously transmitted to the driving valve flow simulation subsystem 37 to simulate a driving valve flow field. With the discharge of the medium in the driving valve, the medium pressure in the main valve flow simulation subsystem 30 changes, which causes the valve flap of the main valve motion simulation subsystem 38 to open under the action of the medium pressure, and the opening signal is synchronously transmitted to the main valve flow simulation subsystem 30 to simulate the main valve flow field.
When the medium pressure in the voltage stabilizer simulation system 31 is reduced to a set value in the opened state of the safety valve, the moving part of the auxiliary valve action simulation subsystem 34 is acted by the sealing force, the valve clack is closed, the closing signal is synchronously transmitted to the auxiliary valve flow simulation subsystem 35, and the auxiliary valve flow field is simulated. Along with the end of the discharge of the medium in the auxiliary valve, the medium pressure in the driving valve flow simulation subsystem 37 rises, so that the valve clack of the driving valve action simulation subsystem 36 is closed under the action of sealing force, the closing signal is synchronously transmitted to the driving valve flow simulation subsystem 37, and the driving valve flow field is simulated. With the end of the discharge of the medium in the driven valve, the medium pressure in the main valve flow simulation subsystem 30 rises, causing the valve flap of the main valve motion simulation subsystem 38 to close under the sealing force, and the closing signal is synchronously transmitted to the main valve flow simulation subsystem 30 to simulate the main valve flow field.
In fig. 6, the medium flow direction in the main valve action simulation subsystem is from the valve upper side to the valve seat lower side, and the default flow direction in the model is from the valve seat lower side to the valve flap upper side, i.e. the actual flow direction is opposite to the default flow direction, which will generate an additional back pressure influence calculation on the valve flap, thereby adding an additional back pressure balance structure which does not really exist to eliminate the additional pressure influence. The driven valve flow simulation subsystem is similar to the auxiliary valve action simulation subsystem, and an additional back pressure balance structure is added to eliminate the influence.
The main valve and the valve clack of the driving valve of the safety valve shown in fig. 7 adopt a self-tightening sealing design, and the forced sealing is realized by using the system pressure in the valve closing state, and a self-tightening sealing subsystem of the main valve and the driving valve needs to be established by using a signal/logic control submodel library related submodel: the self-tightening sealing force of the main valve is determined by the main valve self-tightening sealing subsystem 32 through calculation according to the pressure data of the main valve flow simulation subsystem 30 and the valve clack opening and closing state of the main valve action simulation subsystem 38; the self-tightening sealing force of the driving valve is determined by calculation of the self-tightening sealing subsystem 33 of the driving valve according to pressure data of the flow simulation subsystem 37 of the driving valve and the valve clack opening and closing state of the motion simulation subsystem 36 of the driving valve.
In fig. 2, the pressure of the lower cavity of the main valve piston is consistent with that of the outlet, the pressure of the upper cavity 6 of the main valve piston is relieved, the pressure difference between the upper cavity and the lower cavity of the piston is reduced, the sealing force is lost, and the valve clack 3 is jacked up by the medium at the inlet 1 of the valve to realize opening. In the model, this flow direction is the conventional flow direction and there is no additional back pressure to affect the calculation, so there is no structure below the valve module 9 with the valve seat flap in fig. 3 to balance the additional back pressure.
As shown in fig. 6 (wherein the main valve portion in fig. 6 adopts the main valve principle structure of fig. 2), the main valve inlet 1 and the main valve outlet 8 of the main valve. Fig. 6 and 4 are two different types and principles of main valves. In the main valve of fig. 6, the pressure in the upper piston chamber is relieved, and the pressure difference is generated between the upper and lower piston chambers, so that the main valve is opened under the action of the pressure difference. This flow direction is opposite to the conventional direction, and there is an influence of the additional back pressure in the modeling, and therefore, there is a structure (the main valve additional back pressure balancing structure 39, the driven valve additional back pressure balancing structure 40, the auxiliary valve additional back pressure balancing structure 41) of fig. 7 that balances the additional back pressure.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The modeling method for analyzing the dynamic characteristics of the pilot operated safety valve comprises the following processes:
step M1, building an overall simulation model sketch: building simulation models of sub-valves of the pilot-operated safety valve according to a pilot-operated safety valve schematic diagram, and assembling and connecting the simulation models of the sub-valves according to the pilot-operated safety valve principle to form a complete pilot-operated safety valve model;
the method is characterized in that the establishing process of the simulation model of each sub-valve comprises the following steps:
selecting a sub-model required by each sub-valve, wherein the sub-model is a one-dimensional numerical simulation model;
establishing a corresponding valve cavity finite element numerical simulation model aiming at the valve cavity of each sub-valve, wherein the valve cavity finite element numerical simulation model is a two-dimensional or three-dimensional numerical simulation model;
and butting the boundary condition data interaction channel interface of the valve cavity finite element numerical simulation model with the sub-model data interaction channel interface connected with the valve cavity finite element numerical simulation model to realize the conversion and interactive coupling of the one-dimensional data and the two-dimensional or three-dimensional data.
2. The modeling method for analysis of the dynamic characteristics of a pilot operated safety valve according to claim 1, further comprising,
step M2, determining the simulation type of each sub-model: configuring a submodel solving type for a submodel in a pilot operated safety valve model;
step M3, determining parameters and boundary conditions: setting boundary condition parameters of a pilot operated safety valve model according to external given parameters of the pilot operated safety valve;
step M4, forming a simulation model file: compiling a pilot safety valve model with a sub-model solving type and boundary condition parameters to form a simulation model file;
step M5, setting a simulation solver: setting parameters of a simulation solver for the simulation model file;
step M6, obtaining a dynamic characteristic curve of the pilot operated safety valve through simulation: and D, performing simulation calculation by using the simulation solver obtained in the step M5, and drawing a dynamic characteristic curve of the pilot operated safety valve according to a simulation real-time output result.
3. The modeling method for analysis of dynamic characteristics of a pilot operated safety valve according to claim 1, characterized in that,
the required submodel is selected from the determined required model base, and the required model base determines the model base required by modeling according to the application scene and the discharge medium of the pilot operated safety valve;
the sub-model library comprises: hydraulic sub-model library, pneumatic sub-model library, two-phase flow sub-model library, heat transfer sub-model library, mechanical sub-model library and signal/logic control sub-model library.
4. The modeling method for analysis of dynamic characteristics of a pilot operated safety valve according to claim 1, characterized in that,
establishing a corresponding valve cavity finite element numerical simulation model comprises the following steps:
step 2.1: determining a valve cavity for establishing finite element analysis;
step 2.2: drawing a two-dimensional or three-dimensional valve cavity geometric model according to a schematic diagram of a pilot operated safety valve and the calculation precision requirement;
step 2.3: discretizing the valve cavity geometric model according to the valve cavity flowing state and the flowing medium calculation precision requirement to generate a grid file;
step 2.4: setting initial conditions, and establishing a boundary condition data interaction channel interface of the valve cavity finite element numerical simulation model.
5. The modeling method for analysis of dynamic characteristics of a pilot operated safety valve according to claim 1, characterized in that,
the sub-valve includes: pilot valves and main valves and auxiliary valves or/and functional valves fitted on the pilot operated safety valves and having different purposes.
6. The modeling method of the dynamic characteristic analysis of the pilot operated safety valve according to claim 2, characterized in that,
step M3, determining parameters and boundary conditions includes:
step M3.1: determining the relevant values of all mechanical structures and movable parts in the model according to a principle diagram of a pilot operated safety valve, wherein the relevant values comprise: valve flap mass, spring force, valve cavity volume, hole or flow channel size;
step M3.2: setting initialization state parameters according to the pre-test state, comprising: the temperature/pressure of each valve cavity, the initial sealing force of the valve clack and the initial condition of a discharge medium source;
step M3.3: setting test boundary conditions according to the capability of the test device to be simulated and test data acquired by a field test, wherein the test boundary conditions comprise: a discharge medium source condition, outlet environmental conditions of the main and pilot valves, and other sub-valve boundary conditions;
step M3.4: in special cases, logic control signal setting is performed: because the model library is incomplete, part of the structure needs to be simulated by a logic control signal, and the control signal is set according to a physical model formula of the structure.
7. The modeling method of the dynamic characteristic analysis of the pilot operated safety valve according to claim 2, characterized in that,
m5, setting solving parameters of the sub-model and the valve cavity finite element numerical simulation model in the simulation solver, and ensuring that resolving nodes of the two solvers are consistent, effective and synchronous;
step M6, obtaining dynamic characteristic curve of the pilot operated safety valve through simulation: the dynamic characteristic curve of the pilot operated safety valve at least comprises a curve of a parameter C changing along with time, wherein the parameter C comprises: the pressure of the discharge medium source, the pressure in front of the pilot safety valve, the opening height of the main valve/pilot valve of the pilot safety valve, the displacement of the main valve/pilot valve of the pilot safety valve, and the opening height and the chamber pressure of other sub-valves.
8. The dynamic characteristic analysis model of the pilot operated safety valve is characterized in that,
the analysis model of the dynamic characteristics of the pilot operated safety valve is arranged according to the layout of the pilot operated safety valve in a loop of the nuclear reactor; the dynamic characteristic analysis model of the pilot operated safety valve is a two-phase flow simulation model at the moment;
the layout of the pilot operated safety valve in a nuclear reactor primary circuit is as follows: the pilot operated safety valve comprises a main valve (20) and a pilot valve (27), wherein the pilot valve comprises an auxiliary valve (25) and a driving valve (26), a voltage stabilizer (28) in a loop of the nuclear reactor is communicated with a valve inlet (1) of the main valve (20), and the voltage stabilizer (28) is communicated with a pressure sensing end (23) of the auxiliary valve (25) through a pilot valve pressure sensing pipe (22); the pressure relief end of the main valve (20) is communicated with an inner chamber of the driving valve through a main valve upper cavity pressure relief pipeline (21), the inner chamber of the driving valve is communicated with a pressure relief box (29) in a nuclear reactor loop, and a valve outlet (8) of the main valve (20) is communicated with the pressure relief box (29) through a main valve pressure relief pipeline (19);
the analysis model for the dynamic characteristics of the pilot operated safety valve comprises the following steps: a voltage stabilizer simulation system (31) corresponding to the voltage stabilizer, a pressure relief tank simulation system (42) corresponding to the pressure relief tank, and a pilot safety valve simulation model corresponding to a pilot safety valve for communicating the voltage stabilizer and the pressure relief tank;
the pilot operated safety valve simulation model comprises: a simulation model of a main valve sub-valve corresponding to a main valve, a simulation model of a driven valve sub-valve corresponding to a driven valve, a simulation model of an auxiliary valve sub-valve corresponding to an auxiliary valve; the simulation model of the main sub-valve comprises: a main valve action simulation subsystem (38), a main valve additional backpressure balance structure (39), a main valve flow simulation subsystem (30) and a main valve self-tightening sealing subsystem (32); the simulation model for driving the valve of the valve comprises: drive valve action simulation subsystem (36), drive valve extra back pressure balanced structure (40), drive valve flow simulation subsystem (37), drive valve self-tightening sealing subsystem (33), the simulation model of assisting valve sub-valve includes: an auxiliary valve action simulation subsystem (34), an auxiliary valve extra backpressure balance structure (41) and an auxiliary valve flow simulation subsystem (35);
the main valve extra back pressure balance structure (39) is in back pressure coupling with a valve module (9) with a valve seat and a valve clack in the main valve action simulation subsystem (38), the driving valve extra back pressure balance structure (40) is in back pressure coupling with the valve module (9) with the valve seat and the valve clack in the driving valve action simulation subsystem, and the auxiliary valve extra back pressure balance structure (41) is in back pressure coupling with the valve module (9) with the valve seat and the valve clack in the auxiliary valve action simulation subsystem; the back pressure coupling is that the pressure direction of a valve module (9) with a valve seat valve clack is opposite to the pressure direction of an additional back pressure balancing structure (39) of a main valve and is coupled together;
the valve clacks of the main valve and the driving valve adopt a self-tightening sealing structure, the forced sealing is realized by using the system pressure in the closing state of the valve, a main valve self-tightening sealing subsystem (32) and a driving valve self-tightening sealing subsystem (33) are established by using a signal/logic control sub-model library, and the main valve self-tightening sealing subsystem (32) is in data interactive coupling with a main valve flow simulation subsystem (30) and a main valve action simulation subsystem (38); the driving valve self-tightening sealing subsystem (33) is in data cross coupling with the driving valve flow simulation subsystem (37) and the driving valve motion simulation subsystem (36); the self-tightening sealing force of the main valve is determined by the main valve self-tightening sealing subsystem (32) through calculation according to the pressure data of the main valve flow simulation subsystem (30) and the valve clack opening and closing state of the main valve action simulation subsystem (38); the self-tightening sealing force of the driving valve is determined by calculation through a driving valve self-tightening sealing subsystem (33) according to pressure data of a driving valve flow simulation subsystem (37) and the valve clack opening and closing state of a driving valve action simulation subsystem (36);
the flow directions of the medium in the main valve flow simulation subsystem (30), the drive valve flow simulation subsystem (37) and the auxiliary valve flow simulation subsystem (35) are arranged in a loop of the nuclear reactor according to the pilot type safety valve;
at this time, the actual flow direction of the medium is not in accordance with the default flow direction of the medium in the simulation model of the main valve sub-valve, the simulation model of the driving valve sub-valve, and the simulation model of the sub-valve, and the main valve extra back pressure balance structure (39), the driving valve extra back pressure balance structure (40), and the sub-valve extra back pressure balance structure (41) which do not correspond to the solid structure are added to the simulation model of the main valve sub-valve, the simulation model of the driving valve sub-valve, and the simulation model of the sub-valve, respectively, so as to eliminate the influence of extra back pressure generated in the valve flap.
9. The pilot operated safety valve dynamics analysis model of claim 8,
the main valve operation simulation subsystem (38) and the driven valve operation simulation subsystem (36) each include:
a valve module (9) with a valve seat flap, a mass (10), a piston chamber module (11) without a spring, a piston chamber module (12) with a spring;
the auxiliary valve action simulation subsystem (34) comprises: a valve module (9) with a valve seat and a valve clack, a mass block (10) and a piston cavity module (12) with a spring;
the piston cavity module (11) without the spring and the piston cavity module (12) with the spring are jointly formed and used for simulating a piston structure with a pre-tightening spring, and the piston structure with the pre-tightening spring comprises; a piston cavity (7), a pre-tightening spring (6) arranged in the piston cavity (7) and a piston (5); the piston cavity module (12) with the spring is used for simulating the piston cavity (7) part above the piston (5), and the piston cavity (7) part above the piston (5) is provided with a pre-tightening spring (6); the piston cavity module (11) without the spring is used for simulating the piston cavity (7) part below the piston (5), and the piston cavity (7) part below the simulated piston (5) is not provided with the pre-tightening spring (6);
the mass block (10) is used for simulating the mass sum of all moving parts in the opening and closing process of the valve, and the mass sum of all moving parts comprises the mass sum of the valve clack (3), the valve rod (4) and the piston (5);
the valve module 9 with the valve seat and the valve clack is used for simulating the combined structure of the valve seat (2) and the valve clack (3);
the parameters of the pre-tensioning spring (6) can be set in a piston chamber module (12) with a spring, and the self-tensioning sealing force is generated by the piston structure and finally acts on a valve module (9) with a valve seat and a valve clack.
10. The pilot operated safety valve dynamics analysis model of claim 8,
the main valve flow simulation subsystem (30) and the driven valve flow simulation subsystem (37) each include:
a piston upper cavity interface module (13), a piston upper cavity module (14), a gap or pore channel module (15) between the piston upper cavity and the piston lower cavity, a piston lower cavity and valve cavity module (16), a valve outlet module (17) and a valve inlet module (18),
the auxiliary valve flow simulation subsystem (35) includes:
the piston upper cavity interface module (13), the piston upper cavity module (14), a gap or pore channel module (15) between the upper cavity and the lower cavity of the piston, a valve outlet module (17) and a valve inlet pressure module (18);
the piston upper cavity interface module (13) is used for simulating a piston cavity formed by connecting a pilot valve and a main valve;
the piston upper cavity module (14) is used for simulating a piston cavity part above the piston;
a gap or a pore passage (15) between the upper cavity and the lower cavity of the piston is used for simulating a gap between the piston and the side wall or is used for simulating a piston hole for adjusting the pressure of the upper cavity and the lower cavity of the piston on the piston; the number of gaps or pore passages (15) between the upper and lower cavities of the piston in the main valve flow simulation subsystem (30) and the driven valve flow simulation subsystem (37) is 2;
the piston lower cavity and valve cavity module (16) is used for simulating the part of the piston cavity part below the piston, which is connected with the valve cavity;
the valve outlet module (17) is an open container model or a discharge medium receiving container and adopts pressure identification;
the valve inlet module (18) is a pressure source model or a vented media source module, and is identified by pressure.
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