CN113255246A - Opening pressure setting method for main steam safety valve in main steam valve station - Google Patents
Opening pressure setting method for main steam safety valve in main steam valve station Download PDFInfo
- Publication number
- CN113255246A CN113255246A CN202110571466.7A CN202110571466A CN113255246A CN 113255246 A CN113255246 A CN 113255246A CN 202110571466 A CN202110571466 A CN 202110571466A CN 113255246 A CN113255246 A CN 113255246A
- Authority
- CN
- China
- Prior art keywords
- main steam
- pressure
- valve
- value
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000012530 fluid Substances 0.000 claims abstract description 46
- 238000002955 isolation Methods 0.000 claims abstract description 40
- 238000009826 distribution Methods 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims description 20
- 238000002360 preparation method Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- FWEOQOXTVHGIFQ-UHFFFAOYSA-N 8-anilinonaphthalene-1-sulfonic acid Chemical compound C=12C(S(=O)(=O)O)=CC=CC2=CC=CC=1NC1=CC=CC=C1 FWEOQOXTVHGIFQ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims 6
- 238000004088 simulation Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Geometry (AREA)
- Evolutionary Computation (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Computer Hardware Design (AREA)
- Fluid Mechanics (AREA)
- Mathematical Physics (AREA)
- Computing Systems (AREA)
- Algebra (AREA)
- Computer Graphics (AREA)
- Software Systems (AREA)
- Computational Mathematics (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a method for setting the opening pressure of a main steam safety valve in a main steam valve station, which comprises the following steps: establishing a three-dimensional model of the normal working condition of the valve, and obtaining a pressure value before an inlet of the preposed isolating valve as an opening pressure of the preposed isolating valve; establishing a three-dimensional model of opening a preposed isolation valve and closing a main steam isolation valve under the overpressure working condition of the valve, and checking pressure field distribution by utilizing post-processing software; if the inlet pressure is lower than the maximum normal working pressure, the inlet pressure is continuously increased until the result after the post-treatment is approximately equal to the maximum normal working pressure; and finally, taking the inlet pressure value at the moment as the opening pressure of the main steam safety valve. The method is based on a numerical simulation method, and by checking fluid pressure fields in the main steam valve station under the maximum normal working pressure and the pressure exceeding the normal working pressure, approximate values selected by the opening pressure of each overpressure protection valve in the valve station under different application working conditions are effectively determined, so that the main steam valve station is ensured to have good overpressure protection capability to a certain extent.
Description
Technical Field
The invention belongs to the field of main steam valve stations, and particularly relates to a method for setting the opening pressure of a main steam safety valve in a main steam valve station.
Background
With the rapid development of economy in China, the demand for energy is increasing day by day, and energy transformation becomes a consensus day by day. Nuclear power is one kind of new forms of energy, and is clean high-efficient, is the important direction that realizes energy structure adjustment and guarantee the energy demand in the future. The main steam valve station is used as one of key overpressure protection devices in a main steam system of a secondary loop of the nuclear power plant, is located outside a containment vessel, and has important significance for safe and reliable operation of the main steam system. In the event of a failure, such as a pipe rupture, both upstream (towards the steam generator) and downstream (towards the steam turbine), this process may raise the steam pressure at the inlet of the valve station above the allowable value, the main steam valve station is closed by pilot control of the main steam quick isolation valve, which simultaneously opens the pre-isolation valve or main steam safety valve to bleed steam to atmospheric pressure, and closes the bleed function when the system pressure returns to normal.
The main steam valve station is a valve group system formed by mutually welding a main steam isolating valve, a preposed isolating valve and two main steam safety valves. Each valve in the valve station is in a multi-stage pilot control mode, namely, a plurality of valves with smaller volumes are used for controlling the flow of fluid on the upper part of a valve core of the main valve, so that the opening and closing of the main valve are automatically controlled. When the system pressure exceeds a safe value, a preposed isolation valve in the main steam valve station is opened firstly, and if the system pressure is continuously increased to a certain value, the main steam safety valve is opened subsequently. Therefore, the opening pressure of the valve is an important parameter for controlling the operation of the main steam valve station. If the opening pressures of the pre-isolation valve and the main steam safety valve are not properly selected, the safety of a secondary loop of the nuclear power station cannot be guaranteed by the main steam valve station, and even the emergency shutdown of the system may be caused. While less research is currently being conducted on the main steam valve station, the selection of the respective overpressure opening valve opening pressures within the valve station has not been addressed.
Therefore, it is of great importance to investigate the choice of how to reduce the opening pressure of the individual overpressure opening valves of the main steam valve station.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for setting the opening pressure of a main steam safety valve in a main steam valve station. The method is based on a numerical simulation method, the flow of the fluid in the valve is visualized, the approximate value of the selection of the opening pressure of each overpressure protection valve in the valve station under different application working conditions is effectively determined by checking the fluid pressure fields in the main steam valve station under the maximum normal working pressure and the fluid pressure fields in the main steam valve station under the pressure exceeding the normal working pressure, and the main steam valve station is ensured to have good overpressure protection capability to a certain extent.
The invention adopts the following specific technical scheme:
the invention provides a method for setting the opening pressure of a main steam safety valve in a main steam valve station, which comprises the following steps:
s1: modeling a main steam valve station in three-dimensional modeling software, and prolonging an inlet runner and an outlet runner of a main steam isolating valve in the main steam valve station;
s2: determining the inlet flow and the maximum normal working pressure P of the main steam valve station according to the practical application working condition of the main steam valve station1And an ideal maximum allowable overpressure time t;
s3: on the basis of S1, extracting a first flow channel model of the main steam valve station; importing the first flow channel model into mesh division software to carry out mesh discrete division to obtain a first mesh discrete model; importing the first grid discrete model into computational fluid dynamics software, defining an inlet as a first flow inlet or a first pressure inlet, and defining an outlet as a first pressure outlet; inputting flow rate values or P to the inlet in turn according to the result of S21Inputting an atmospheric pressure value to the outlet; determining parameters of working fluid in a main steam valve station according to the working pressure, and inputting the parameters into fluid mechanics software; obtaining a first grid discrete preparation model; selecting a turbulence model through computational fluid dynamics software to solve a flow field of the first grid discrete preparation model; after the calculation is converged, processing the calculation result through post-processing software to obtain a pressure distribution cloud chart at the sections of the main steam isolation valve, the preposed isolation valve and the first main steam safety valve; obtaining the average pressure value at the front section of the inlet of the front isolating valve through the pressure distribution cloud chart, and taking the average pressure value as the opening pressure of the front isolating valve;
s4: on the basis of S1, setting the valve core of the preposed isolation valve to be in a full-open state through three-dimensional modeling software, prolonging the outlet flow channel of the preposed isolation valve, and overlapping the valve core of the main steam isolation valve and the valve seat to close the valve core;
s5: on the basis of S4, extracting a second flow channel model of the main steam valve station through three-dimensional modeling software; importing the second flow channel model into mesh division software to carry out mesh discrete division to obtain a second mesh discrete model;
s6: introducing the second grid discrete model into computational fluid dynamics software, solving a transient fluid pressure field of the main steam valve station in an opening state, repeating the S3 process, and obtaining pressure distribution values of all areas in the flow channel after calculation convergence;
s7: on the basis of S2, the method comprises the following stepsSaid maximum normal operating pressure P1Adding delta P/n to obtain pressure P under the overpressure working conditionn(ii) a Wherein, the value of delta P is arbitrarily selected between 0 and 1Mpa, and the initial value of n is 1;
s8: on the basis of S6, defining the inlet as a second pressure inlet through computational fluid dynamics software, wherein the pressure at the second pressure inlet is the pressure P under an overpressure conditionn(ii) a Defining the outlet as a second pressure outlet, and inputting an atmospheric pressure value; according to PnDetermining the parameters of the working fluid in the main steam valve station by the values, and inputting the parameters into fluid mechanics software; obtaining a second grid discrete preparation model; selecting a turbulence model through computational fluid dynamics software, and selecting a transient solver to solve so as to obtain a flow field of the second grid discrete preparation model;
s9: on the basis of S2 and S8, stopping calculation after the calculation time passes through the ideal maximum allowable overpressure time, and processing the calculation result by using post-processing software to obtain an inlet pressure value P1n；
S10: will P1nValue and P1Comparing the values; if P1nValue less than P1Value, then order Pn＝Pn+ (Δ P/n); repeating steps S8 and S9 until P1nValue greater than P1If so, go to S11;
s11: adding one to the value of n to make Pn＝Pn- (Δ P/n); repeating steps S8 and S9 until P1nValue less than P1If so, go to S12;
s12: adding one to the value of n, repeating steps S10 and S11 until P1nValue is approximately equal to P1Value, end loop; p at this timenThe value is the opening pressure of the main steam safety valve in the main steam valve station.
Preferably, in S1, the length of the inlet flow path in the main steam isolation valve is increased to 5 times the inner diameter of the inlet flow path, and the length of the outlet flow path is increased to 10 times the inner diameter of the outlet flow path.
Preferably, the first flow passage is a limited closed space surrounded by the inlet of the main steam valve station, the outlet of the main steam valve station and the inner wall surface of the main steam valve.
Preferably, in S7, the length of the outlet flow path in the pre-isolation valve is extended to 10 times the inner diameter of the outlet flow path.
Preferably, the second flow channel model is a limited closed space surrounded by the inlet of the main steam valve station, the outlet of the main steam isolation valve of the main steam valve station, the outlet of the front isolation valve and the inner wall surface of the main steam valve.
Preferably, the three-dimensional modeling software is one of Solidworks, Creo, Inventor, UG/NX, CATIA, DesignModelr and SpaceClaim.
Preferably, the Mesh division software is one of ICEM, Hypermesh, TGrid, PointWise, ANSA, GridPro or ANSYS Workbench Mesh.
Preferably, the computational fluid dynamics software is one of ANSYS Fluent, ANSYS CFX, STAR-CD, STAR-CCM, NUMCA or OpenFOAM.
Preferably, the Post-processing software is one of ANSYS Fluent, Tecplot or CFD-Post.
Preferably, in S12, P is1nValue is approximately equal to P1Value of P1nValue and P1The difference between the values is 0.1 or 0.01.
Compared with the prior art, the invention has the following beneficial effects:
the method provided by the invention selects the opening pressure of each overpressure protection valve in the valve according to different working conditions applied to the main steam valve station, and is wide in application range. Compared with the theoretical derivation, the solving process of the invention is simple, the calculation cost is low, and the calculation result has high precision. The method is based on a numerical simulation method, the flow of the fluid in the valve is visualized, the approximate value of the selection of the opening pressure of each overpressure protection valve in the valve station under different application working conditions is effectively determined by checking the fluid pressure fields in the main steam valve station under the maximum normal working pressure and the fluid pressure fields in the main steam valve station under the pressure exceeding the normal working pressure, and the main steam valve station is ensured to have good overpressure protection capability to a certain extent.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional model structure of a main steam valve station under normal working conditions in the embodiment;
FIG. 2 is a schematic diagram of a first mesh discrete model under normal operating conditions in the embodiment;
FIG. 3 is a schematic view of the distribution of the pressure field in the XY section of the main steam valve station under normal working conditions in the embodiment;
FIG. 4 is a schematic diagram of a three-dimensional model structure of a main steam valve station under an overpressure condition in the embodiment;
FIG. 5 is a schematic diagram of a second grid discrete model under an overpressure condition in an embodiment;
FIG. 6 is a schematic diagram of the distribution of the pressure field in the XY section of the main steam valve station under the overpressure condition in the embodiment.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
The invention provides a method for setting the opening pressure of a main steam safety valve in a main steam valve station, which comprises the following steps:
s1: the valves in the main steam valve station are modeled separately in three-dimensional modeling software and assembled according to a valve design file. The inlet and outlet flow paths of the main steam isolation valve in the main steam valve station are then extended. The reason for prolonging the inlet channel and the outlet channel of the main steam isolation valve is to enable the fluid to flow more uniformly in the main steam isolation valve, so that a more accurate flow field value can be obtained subsequently, and a larger deviation of the obtained flow field value from an actual value is avoided. The three-dimensional modeling software can adopt one of Solidworks, Creo, Inventor, UG/NX, CATIA, DesignModelr or SpaceClaim.
As shown in fig. 1, which is an assembled structural schematic diagram of a main steam valve station provided in this embodiment, the length of the inlet flow channel in the main steam isolation valve is extended to be 5 times of the inner diameter of the inlet flow channel, and the length of the outlet flow channel is extended to be 10 times of the inner diameter of the outlet flow channel.
S2: determining the inlet of the main steam valve station according to the practical application condition of the main steam valve stationFlow rate, maximum normal operating pressure P1The value and the ideal maximum allowable overpressure time t. Wherein, the inlet flow of the main steam valve station refers to the flow value in the pipeline; maximum normal operating pressure P1The value refers to the operating pressure of the entire process system and is related to the valve. The values can be obtained according to the actual valve condition.
In this example, t is 1s, the inlet flow is 38kg/s, and P is1＝6.5MPa。
S3: and on the basis of S1, extracting a first flow channel model of the main steam valve station, wherein the first flow channel is a limited closed space surrounded by an inlet of the main steam valve station, an outlet of the main steam valve station and the inner wall surface of the main steam valve. And importing the first flow channel model into mesh division software to carry out mesh discrete division to obtain a first mesh discrete model. In the present embodiment, the first mesh discrete model is as shown in fig. 2. The grid division software can adopt one of ICEM, Hypermesh, TGrid, PointWise, ANSA, GridPro or ANSYS Workbench Mesh.
The first mesh discrete model is imported into computational fluid dynamics software, defining the inlet as a first flow inlet, or a first pressure inlet, and the outlet as a first pressure outlet. The computational fluid dynamics software may employ one of ANSYS flow, ANSYS CFX, STAR-CD, STAR-CCM, NUMCA, or OpenFOAM.
Inputting flow rate values or P to the inlet in turn according to the result of S21And inputting an atmospheric pressure value to the outlet. And determining parameters of the working fluid in the main steam valve station according to the working pressure, and inputting the parameters into fluid mechanics software. And obtaining a first grid discrete preparation model. The turbulence model is selected by computational fluid dynamics software to solve the flow field of the first mesh discrete preliminary model. In this embodiment, the turbulence model is a standard k-epsilon turbulence model.
And after the calculation is converged, processing the calculation result through post-processing software to obtain a pressure distribution cloud chart at the sections of the main steam isolation valve, the preposed isolation valve and the first main steam safety valve. The cloud of the pressure distribution obtained in this example is shown in fig. 3. And obtaining the average pressure value of a certain section in front of the inlet of the front isolation valve through a pressure distribution cloud chart, and taking the average pressure value as the opening pressure of the front isolation valve. The Post-processing software may employ one of ANSYS Fluent, Tecplot, or CFD-Post. In the embodiment, the Post-processing software adopts CFD-Post.
S4: on the basis of S1, the valve core of the preposed isolation valve is set to be in a full-open state through three-dimensional modeling software, the outlet flow channel of the preposed isolation valve is prolonged, and the valve core of the main steam isolation valve is overlapped with the valve seat to be closed.
In this embodiment, the length of the outlet flow channel in the pre-isolation valve is extended to 10 times of the inner diameter of the outlet flow channel, and meanwhile, the valve core of the main steam quick isolation valve is overlapped with the valve seat to close the main steam quick isolation valve, so as to avoid the inlet and outlet effect, as shown in fig. 4.
S5: and on the basis of S4, extracting a second flow channel model of the main steam valve station through three-dimensional modeling software, wherein the second flow channel model is a limited closed space surrounded by an inlet of the main steam valve station, an outlet of a main steam isolation valve of the main steam valve station, an outlet of a front isolation valve and the inner wall surface of the main steam valve. And importing the second flow channel model into meshing software to carry out mesh discrete division to obtain a second mesh discrete model. The second mesh discrete model in this embodiment is shown in fig. 5.
S6: and (4) introducing the second grid discrete model into computational fluid dynamics software, solving the transient fluid pressure field of the main steam valve station in an opening state, repeating the S3 process, and obtaining the pressure distribution value of each area in the flow channel after calculation convergence.
S7: on the basis of S2, the maximum normal working pressure P is set1Adding delta P/n to obtain pressure P under the overpressure working conditionn. Wherein, the delta P is a user-defined value, and the delta P is generally any value between 0 and 1 Mpa; n is the number of iteration steps, the initial value of which is 1.
In this example, Δ P is 0.5 MPa.
S8: on the basis of S6, the inlet is defined as a second pressure inlet through computational fluid dynamics software, and the inlet pressure is changed into the pressure P under the overpressure conditionn. The outlet is defined as the second pressure outlet and the atmospheric pressure value is input. According to PnValue determinationAnd (4) parameters of working fluid in the main steam valve station are input into the fluid mechanics software. And obtaining a second grid discrete preparation model. And selecting a turbulence model through computational fluid dynamics software, and selecting a transient solver to solve so as to solve the flow field of the second grid discrete preparation model.
In this embodiment, the turbulence model is a standard k-epsilon turbulence model.
S9: on the basis of S2 and S8, stopping calculation after the calculation time passes through the ideal maximum allowable overpressure time, and processing the calculation result by using post-processing software to obtain an inlet pressure value P1n。
S10: will P1nValue and P1The values are compared. If P1nValue less than P1Value, then order Pn＝Pn+ (Δ P/n). Repeating steps S8 and S9 until P1nValue greater than P1Value, S11 is executed.
S11: adding one to the value of n to make Pn＝Pn- (Δ P/n). Repeating steps S8 and S9 until P1nValue less than P1Value, S12 is executed.
S12: adding one to the n value, and repeating the steps S10-S11 until P1nValue is approximately equal to P1And ending the loop. P at this timenThe value is the opening pressure of the main steam safety valve in the main steam valve station.
In this embodiment, P1nValue is approximately equal to P1Value of P1nValue and P1The difference between the values is 0.1 or 0.01. The structure of the main steam safety valve of the embodiment after optimization and post-processing software is shown in fig. 6, and corresponding P is obtainednA value of 8MPa, PnThe value is the opening pressure of the main steam safety valve in the main steam valve station.
The method is based on a numerical simulation method, the flow of the fluid in the valve is visualized, the approximate value of the selection of the opening pressure of each overpressure protection valve in the valve station under different application working conditions is effectively determined by checking the fluid pressure fields in the main steam valve station under the maximum normal working pressure and the fluid pressure fields in the main steam valve station under the pressure exceeding the normal working pressure, and the main steam valve station is ensured to have good overpressure protection capability to a certain extent.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (10)
1. A method for setting the opening pressure of a main steam safety valve in a main steam valve station is characterized by comprising the following steps:
s1: modeling a main steam valve station in three-dimensional modeling software, and prolonging an inlet runner and an outlet runner of a main steam isolating valve in the main steam valve station;
s2: determining the inlet flow and the maximum normal working pressure P of the main steam valve station according to the practical application working condition of the main steam valve station1And an ideal maximum allowable overpressure time t;
s3: on the basis of S1, extracting a first flow channel model of the main steam valve station; importing the first flow channel model into mesh division software to carry out mesh discrete division to obtain a first mesh discrete model; importing the first grid discrete model into computational fluid dynamics software, defining an inlet as a first flow inlet or a first pressure inlet, and defining an outlet as a first pressure outlet; inputting flow rate values or P to the inlet in turn according to the result of S21Inputting an atmospheric pressure value to the outlet; determining parameters of working fluid in a main steam valve station according to the working pressure, and inputting the parameters into fluid mechanics software; obtaining a first grid discrete preparation model; selecting a turbulence model through computational fluid dynamics software to solve a flow field of the first grid discrete preparation model; after the calculation is converged, processing the calculation result through post-processing software to obtain a pressure distribution cloud chart at the sections of the main steam isolation valve, the preposed isolation valve and the first main steam safety valve; obtaining the average pressure value at the front section of the inlet of the front isolating valve through the pressure distribution cloud chart, and taking the average pressure value as the opening pressure of the front isolating valve;
s4: on the basis of S1, setting the valve core of the preposed isolation valve to be in a full-open state through three-dimensional modeling software, prolonging the outlet flow channel of the preposed isolation valve, and overlapping the valve core of the main steam isolation valve and the valve seat to close the valve core;
s5: on the basis of S4, extracting a second flow channel model of the main steam valve station through three-dimensional modeling software; importing the second flow channel model into mesh division software to carry out mesh discrete division to obtain a second mesh discrete model;
s6: introducing the second grid discrete model into computational fluid dynamics software, solving a transient fluid pressure field of the main steam valve station in an opening state, repeating the S3 process, and obtaining pressure distribution values of all areas in the flow channel after calculation convergence;
s7: on the basis of S2, the maximum normal working pressure P is set1Adding delta P/n to obtain pressure P under the overpressure working conditionn(ii) a Wherein, the value of delta P is arbitrarily selected between 0 and 1Mpa, and the initial value of n is 1;
s8: on the basis of S6, defining the inlet as a second pressure inlet through computational fluid dynamics software, wherein the pressure at the second pressure inlet is the pressure P under an overpressure conditionn(ii) a Defining the outlet as a second pressure outlet, and inputting an atmospheric pressure value; according to PnDetermining the parameters of the working fluid in the main steam valve station by the values, and inputting the parameters into fluid mechanics software; obtaining a second grid discrete preparation model; selecting a turbulence model through computational fluid dynamics software, and selecting a transient solver to solve so as to obtain a flow field of the second grid discrete preparation model;
s9: on the basis of S2 and S8, stopping calculation after the calculation time passes through the ideal maximum allowable overpressure time, and processing the calculation result by using post-processing software to obtain an inlet pressure value P1n；
S10: will P1nValue and P1Comparing the values; if P1nValue less than P1Value, then order Pn＝Pn+ (Δ P/n); repeating steps S8 and S9 until P1nValue greater than P1If so, go to S11;
s11: n is equal toPlus one, let Pn＝Pn- (Δ P/n); repeating steps S8 and S9 until P1nValue less than P1If so, go to S12;
s12: adding one to the value of n, repeating steps S10 and S11 until P1nValue is approximately equal to P1Value, end loop; p at this timenThe value is the opening pressure of the main steam safety valve in the main steam valve station.
2. The opening pressure setting method as claimed in claim 1, wherein in S1, the length of the inlet flow path in the main steam isolation valve is extended to be 5 times the inner diameter of the inlet flow path, and the length of the outlet flow path is extended to be 10 times the inner diameter of the outlet flow path.
3. The cracking pressure setting method according to claim 1, wherein the first flow path is a confined space surrounded by an inlet of the main steam valve station, an outlet of the main steam valve station, and an inner wall surface of the main steam valve.
4. The cracking pressure setting method according to claim 1, wherein in S7, the length of the outlet flow passage in the pre-isolation valve is extended to 10 times the inner diameter of the outlet flow passage.
5. The cracking pressure setting method according to claim 1, wherein the second flow channel model is a confined space surrounded by an inlet of the main steam valve station, an outlet of the main steam isolation valve of the main steam valve station, an outlet of the pre-isolation valve and an inner wall surface of the main steam valve.
6. The cracking pressure setting method of claim 1, wherein the three-dimensional modeling software is one of Solidworks, Creo, Inventor, UG/NX, CATIA, designnmodel, or spacecollaim.
7. The cracking pressure setting method according to claim 1, wherein the Mesh division software is one of ICEM, Hypermesh, TGrid, Pointwise, ANSA, GridPro, or ANSYS Workbench Mesh.
8. The cracking pressure setting method of claim 1, wherein the computational fluid dynamics software is one of ANSYS fluid, ANSYS CFX, STAR-CD, STAR-CCM, NUMECA, or OpenFOAM.
9. The opening pressure setting method according to claim 1, wherein the Post-processing software is one of ANSYS Fluent, Tecplot, or CFD-Post.
10. The opening pressure setting method according to claim 1, wherein in S12, P is1nValue is approximately equal to P1Value of P1nValue and P1The difference between the values is 0.1 or 0.01.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571466.7A CN113255246B (en) | 2021-05-25 | 2021-05-25 | Method for setting opening pressure of main steam safety valve in main steam valve station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571466.7A CN113255246B (en) | 2021-05-25 | 2021-05-25 | Method for setting opening pressure of main steam safety valve in main steam valve station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113255246A true CN113255246A (en) | 2021-08-13 |
| CN113255246B CN113255246B (en) | 2023-10-27 |
Family
ID=77184258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110571466.7A Active CN113255246B (en) | 2021-05-25 | 2021-05-25 | Method for setting opening pressure of main steam safety valve in main steam valve station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113255246B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210313082A1 (en) * | 2020-04-01 | 2021-10-07 | Korea Atomic Energy Research Institute | Steam generator accident mitigation system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011057503A1 (en) * | 2009-11-10 | 2011-05-19 | 成都盛特石油装备模拟技术开发有限公司 | Portable drilling simulation system |
| US20150292297A1 (en) * | 2014-04-11 | 2015-10-15 | Ge Oil & Gas Pressure Control Lp | Safety Systems for Isolating Overpressure During Pressurized Fluid Operations |
| CN112096958A (en) * | 2020-09-29 | 2020-12-18 | 核电运行研究(上海)有限公司 | Comprehensive online detection method for valves of nuclear power station |
| CN112613134A (en) * | 2020-12-09 | 2021-04-06 | 浙江大学 | Valve body structure optimization method based on vortex distribution |
-
2021
- 2021-05-25 CN CN202110571466.7A patent/CN113255246B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011057503A1 (en) * | 2009-11-10 | 2011-05-19 | 成都盛特石油装备模拟技术开发有限公司 | Portable drilling simulation system |
| US20150292297A1 (en) * | 2014-04-11 | 2015-10-15 | Ge Oil & Gas Pressure Control Lp | Safety Systems for Isolating Overpressure During Pressurized Fluid Operations |
| CN112096958A (en) * | 2020-09-29 | 2020-12-18 | 核电运行研究(上海)有限公司 | Comprehensive online detection method for valves of nuclear power station |
| CN112613134A (en) * | 2020-12-09 | 2021-04-06 | 浙江大学 | Valve body structure optimization method based on vortex distribution |
Non-Patent Citations (1)
| Title |
|---|
| 张佳;周浩;: "双调节环蒸汽安全阀开启高度对排放能力影响的研究", 阀门, no. 04 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210313082A1 (en) * | 2020-04-01 | 2021-10-07 | Korea Atomic Energy Research Institute | Steam generator accident mitigation system |
| US11823804B2 (en) * | 2020-04-01 | 2023-11-21 | Korea Atomic Energy Research Institute | Steam generator accident mitigation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113255246B (en) | 2023-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113255246A (en) | Opening pressure setting method for main steam safety valve in main steam valve station | |
| CN111723450A (en) | Safety analysis method and system for nuclear power plant | |
| CN103104811B (en) | A kind of pressure regulation air supply method of gas distributing system | |
| CN108763809B (en) | Method for stopping transmission of complex oil pipeline system in case of leakage accident | |
| CN115458193A (en) | Helium system broken pipe protection device and test method | |
| CN113494678A (en) | Hydrogen filling control method and system | |
| CN117514375A (en) | Steam flow determining method and device for steam turbine steam inlet valve | |
| CN105156159A (en) | Turbine flow characteristic optimization method based on optimal overlapping degree of control valves | |
| CN217496563U (en) | Multi-runner adjustable air injection system | |
| CN115167151A (en) | Compressor unit grid-connected combined air supply method, device and system based on dynamic simulation and intelligent control strategy | |
| CN102676713A (en) | Feedforward feedback simulation method for TRT (Top Gas Pressure Recovery Turbine unit) blast furnace top pressure control stamping process and system therefor | |
| CN115935566A (en) | Simulation method and system for natural gas pipeline network, storage medium and electronic equipment | |
| CN104779615B (en) | A kind of net frequency modulation adjusting method of generating set fast cutback | |
| CN110704935B (en) | Automatic debugging and outputting method of SPS software | |
| CN114023471A (en) | Pressurized water reactor nuclear power station simulation experiment bench | |
| CN102789517B (en) | Method for changing flow-displacement nonlinearity of water inlet valve core of hydraulic press | |
| Chen et al. | A new algorithm of GO methodology based on minimal path set | |
| Liu et al. | Effect of Pilot Solenoid Valve Throat Diameter on Dynamic Response Time in Main Steam Valve Set | |
| Jharko | Flexible Modeling System: Steam Generator Model | |
| CN114087536B (en) | Steam pipe network interlocking control method for turbine jump | |
| Zhou et al. | The preliminary research of pressure control system danymic simulation for Ap1000 pressurizer based on parameter adaptive fuzzy pid control algorithm | |
| CN219826794U (en) | A pair of multi-combination type injection device | |
| CN203628278U (en) | Double-cut-off double-pressure-regulating device | |
| Liu et al. | Data Analysis and Discussion on the Reliability of the Control Principle of a Sealed Crude Oil Pipeline | |
| CN217928288U (en) | Temperature and pressure reducing system for accident |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |