CN110765561A - Three-dimensional simulation calculation method and system for internal flow field of condenser of nuclear power unit - Google Patents
Three-dimensional simulation calculation method and system for internal flow field of condenser of nuclear power unit Download PDFInfo
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Abstract
The invention provides a three-dimensional simulation calculation method for the analysis of the internal flow field of a condenser of a nuclear power unit, which is characterized in that a three-dimensional geometric model of the condenser is established according to the actual structure and the size of the condenser; analyzing steam parameters at each position in the three-dimensional geometric model of the condenser by using a computer discrete analysis method to analyze an internal flow field and generate simulation calculation data of the internal flow field of the condenser; the generated simulation calculation data has important significance for unit operation mode evaluation, equipment transformation, fault analysis and the like; therefore, a method with high reliability and low cost is provided for researching the internal flow field of the CPR1000 nuclear power unit condenser.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a three-dimensional simulation calculation method and a three-dimensional simulation calculation system for an internal flow field of a CPR1000 nuclear power unit condenser.
Background
The condenser is used as major equipment of a nuclear power plant, and mainly has the main functions of condensing various exhaust steam in a steam turbine exhaust steam and a thermodynamic system in the condenser and continuously emitting the latent heat of the exhaust steam condensation to the environment through circulating cooling water, and the operation reliability of the condenser directly influences the safety and the efficiency of a unit. The condenser has large volume and complex internal structure, comprises a large number of cooling water pipes, and has small gaps among the cooling water pipes. According to a typical structure diagram of a CPR1000 nuclear power unit condenser, the condenser mainly comprises an upper throat part, a lower throat part, a low-pressure heater, a steam pipeline, a partition plate, a pipe bundle and the like. Meanwhile, the flow field in the condenser has complex components including phase change of steam and non-condensable gases such as air. At present, a CPR1000 nuclear power unit condenser generates the problem of overlarge titanium tube vibration for many times, the main reason of the overlarge titanium tube vibration is the elastic excitation problem caused by steam in the condenser impacting a titanium tube, and whether the titanium tube generates fluid elastic excitation depends on whether the actual flow rate of internal steam and the critical flow rate of the titanium tube are close to each other according to the design criteria in the industry. At present, a nuclear power unit lacks a method for accurately researching the distribution of a flow field inside a condenser and the vibration magnitude of a titanium pipe, so that the dangerous working condition of the condenser operation is difficult to accurately identify, the unit operation power limit value for preventing the titanium pipe of the condenser from vibrating too much is difficult to formulate, and the influence of different improvement measures on the flow field inside the condenser is difficult to research and evaluate.
Disclosure of Invention
The invention aims to provide a three-dimensional simulation calculation method and a three-dimensional simulation calculation system for an internal flow field of a condenser of a CPR1000 nuclear power unit, aiming at the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the three-dimensional simulation calculation method for constructing the internal flow field of the condenser of the nuclear power unit comprises the following steps:
s1, establishing a nuclear power unit condenser three-dimensional geometric model;
s2, solving simulation calculation data of the internal flow field of the condenser at each position in the three-dimensional geometric model of the condenser by using a computer discrete analysis method according to set operation condition data of the condenser;
step S3, generating a simulation calculation result when the simulation calculation data meets the convergence condition;
step S4, judging whether the conditions of safe operation of the condenser are met according to the simulation calculation result of the internal flow field of the condenser; if not, revising inlet working condition data or the three-dimensional geometric model of the condenser until the internal flow field of the condenser meets the safe operation condition.
In the three-dimensional simulation calculation method for the internal flow field of the condenser of the nuclear power unit, which is provided by the invention, the three-dimensional geometric model of the condenser established in the step S1 comprises an upper/lower throat part of the condenser, a low-pressure heater, a titanium tube bundle area, an internal partition plate and a steam flow channel.
According to the three-dimensional simulation calculation method for the internal flow field of the nuclear power unit condenser, the influence of a large number of tube bundles in the condenser on the steam side flow field is simulated through the porous medium model.
In the three-dimensional simulation calculation method for the internal flow field of the condenser of the nuclear power unit, the operation condition data of the condenser comprises steam flow rate, steam temperature, steam pressure, steam humidity, circulating water flow, circulating water temperature and circulating water pressure.
In the three-dimensional simulation calculation method for the internal flow field of the condenser of the nuclear power unit, in step S4, when the steam flow rate obtained through simulation calculation of the internal flow field of the condenser is greater than the critical flow rate threshold of steam, the operation condition data of the condenser or the three-dimensional geometric model of the condenser is revised.
According to another aspect of the present invention, there is also provided a three-dimensional simulation calculation system for an internal flow field of a condenser of a nuclear power plant, including:
the geometric model establishing unit is used for establishing a nuclear power unit condenser three-dimensional geometric model;
the simulation data calculation unit is used for solving simulation calculation data of the internal flow field of the condenser at each position in the three-dimensional geometric model of the condenser by using a computer discrete analysis method according to set operation condition data of the condenser;
the simulation result analysis unit is used for comparing and analyzing simulation calculation data inside the condenser and the critical flow rate threshold requirement and judging whether the simulation calculation result under the calculation condition meets the safe operation condition of the condenser;
and the simulation model revision unit is used for revising the set condenser operation condition data or the condenser three-dimensional geometric model according to the simulation calculation result.
In the three-dimensional simulation system for the internal flow field of the condenser of the nuclear power unit, the three-dimensional geometric model of the condenser established by the geometric model establishing unit comprises an upper throat part/lower throat part of the condenser, a low-pressure heater, a titanium tube bundle area, an internal partition plate and a steam flow channel.
In the three-dimensional simulation system for the internal flow field of the nuclear power unit condenser, the influence of a large number of tube bundles in the condenser on the steam side flow field is simulated through the porous medium model.
In the three-dimensional simulation system for the internal flow field of the condenser of the nuclear power unit, provided by the invention, the operation condition data of the condenser comprises steam flow rate, steam temperature, steam pressure, steam humidity, circulating water flow, circulating water temperature and circulating water pressure.
In the three-dimensional simulation system for the internal flow field of the condenser of the nuclear power unit, the simulation model revision unit revises the set condenser operation condition data or the condenser three-dimensional geometric model when the steam flow rate of the simulation data of the internal flow field of the condenser is greater than the steam flow rate threshold value.
The three-dimensional simulation calculation method and the system for the internal flow field of the condenser of the nuclear power unit have the following beneficial effects: the invention provides a three-dimensional simulation method for an internal flow field of a condenser of a nuclear power plant, which is characterized in that a three-dimensional geometric model is established according to the actual structure and the size of the condenser; analyzing steam flow field parameters at each position in the established three-dimensional geometric model of the condenser by using a computer discrete analysis method to research the internal flow field of the condenser and generate simulation calculation data; the generated simulation calculation data has important significance for unit operation mode evaluation, equipment transformation, fault analysis and the like; therefore, a method with high reliability and low cost is provided for researching the internal flow field of the condenser of the nuclear power plant.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
fig. 1 is a flowchart of a three-dimensional simulation calculation method for an internal flow field of a condenser of a nuclear power generating unit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a three-dimensional simulation computing system for an internal flow field of a condenser of a nuclear power generating unit according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Example one
Fig. 1 is a flowchart of a three-dimensional simulation calculation method for an internal flow field of a condenser in a nuclear power plant according to an embodiment of the present invention, and as shown in fig. 1, the three-dimensional simulation calculation method for the internal flow field of the condenser in the nuclear power plant according to the present invention includes the following steps:
s1, establishing a nuclear power unit condenser three-dimensional geometric model;
specifically, in an embodiment of the invention, according to a condenser drawing, geometric model building is performed on relevant equipment on a condenser body by combining with overall dimension data measured by a three-dimensional measuring instrument on site. Due to the fact that the internal structure of the condenser is complex, the method and the device carry out targeted treatment on each region of the condenser so as to research the influence of the internal complex structure of the condenser on a steam flow field. The condenser mainly comprises a throat part, a heat exchange module, a hot well, a water collecting tank, a flash evaporation tank, a water chamber, a duplex low-pressure heater, a temperature/pressure reducer, a condensed water filtering device, a condenser air extractor and the like, wherein the heat exchange module is core equipment. Further, the three-dimensional geometric model of the condenser established in the step S1 includes upper/lower throats of the condenser, a low-pressure heater, a titanium tube bundle region, an internal partition plate and a steam flow channel.
Specifically, in one embodiment of the invention, the condenser is provided with 4 heat exchange modules, and each module is composed of 14643 titanium tubes with the outer diameter of 25mm and the length of 16541 mm. The middle of each titanium tube is provided with 22 support plates, the span of each support plate is 707mm, and the aperture of each support plate is 25.5 mm. The tube bundle is arranged into a fir-type tube bundle and is divided into a main condensation area and an air cooling area. The tube bundle is divided into a plurality of small steam chambers by the baffle plates along the axial direction, and steam flows in each steam chamber. With the continuous cooling of the steam, the steam outside the pipe is gradually condensed into water by the condensed water inside the pipe. Because the number of the tube bundles is large, the tube bundles are difficult to be modeled in a full three-dimensional mode, and the influence of a large number of tube bundles in the porous medium model condenser on a steam flow field is adopted in the invention.
S2, solving simulation calculation data of the internal flow field of the condenser at each position in the three-dimensional geometric model of the condenser by using a discrete analysis method according to set operation condition data (namely boundary conditions) of the condenser;
specifically, in an embodiment of the present invention, the condenser operation condition data includes a steam flow rate, a steam temperature, a steam pressure, a steam humidity, a circulating water flow rate, a circulating water temperature, and a circulating water pressure. And the flow field distribution in the condenser can be reflected through the steam flow field parameters. Initially, condenser operation condition data are set according to actual condenser operation conditions, wherein the condenser operation condition data refer to steam flow velocity, steam temperature, steam pressure, steam humidity, circulating water flow, circulating water temperature and circulating water pressure at an inlet of a condenser. After the gas enters the condenser, the operation condition data of each position in the three-dimensional geometric model established above can be obtained by a computer discrete analysis method. Here, the flow field distribution in the three-dimensional geometric model may be subjected to discrete analysis using computer technology in combination with a momentum equation and a pressure correction equation in fluid mechanics. It should be noted that the process of obtaining simulation calculation result data by the discrete analysis method belongs to the technical means known to those skilled in the art, and the present invention is not described herein again.
Step S3, generating a simulation calculation result when the simulation calculation data meets the convergence condition;
specifically, in an embodiment of the present invention, convergence determination is performed during the discrete analysis, and when a certain convergence condition is satisfied, steam flow field simulation result data at each position of the three-dimensional geometric model is generated.
Step S4, judging whether the conditions of safe operation of the condenser are met according to the simulation calculation result of the internal flow field of the condenser; if not, revising inlet working condition data or the three-dimensional geometric model of the condenser until the internal flow field of the condenser meets the safe operation condition.
Specifically, in an embodiment of the present invention, the initially set operating condition data and the three-dimensional geometric model are adjusted according to the steam flow rate at each position of the three-dimensional geometric model obtained through the discrete analysis. Specifically, when the steam flow rate obtained through simulation is too large and exceeds a certain standard requirement (ASME) or a critical flow rate required by a condenser designer, a working condition (i.e., researching an optimized unit operation mode) or a model (i.e., researching condenser improvement measures) needs to be revised, so that the steam flow rate inside the condenser meets the requirement of a design criterion. No matter the model or the working condition is revised, the requirement of the internal flow field of the condenser is met. The revision working condition is mainly that the three-dimensional geometric model is unchanged, the parameters of the working condition are reduced, for example, when the condenser is operated in a single row, the operation power of a unit can be reduced, the steam parameters are reduced, and whether the steam flow rate is analyzed again is acceptable. If the power is acceptable, the power of the unit at the moment can be used for a long time without causing damage to the titanium pipe; the revision of the model mainly means that the working condition is not changed, and the flow rate of steam is reduced to an acceptable level by changing the size of a condenser or adding a uniform grid at an inlet and other measures. The model revision is to research how to improve the structure of the condenser by changing the original design of the condenser and provide guidance for the modification scheme of the condenser. The operating condition revision is that under the condition that the design of the condenser is not changed, the steam parameters are low by changing the operating power of the unit, and the method is a mode for optimizing the operating condition of the unit.
Furthermore, various severe operation conditions of the condenser can be identified through steam flow field data obtained through simulation, wherein the severe operation conditions comprise a single-row operation condition of the condenser, a load shedding condition and a low circulating cooling water temperature condition (such as operation of the condenser in winter). The power operation limit value allowed by the condenser under the severe working condition is researched, so that the condenser is prevented from exceeding the design limit value of the condenser under the severe working condition.
The invention provides a three-dimensional simulation calculation method for an internal flow field of a condenser of a nuclear power plant, which is characterized in that a three-dimensional geometric model is established according to the actual structure and the size of the condenser; analyzing the operating condition data at a plurality of positions in the established three-dimensional geometric model by using a discrete analysis method to analyze the internal flow field and generate simulation calculation data; the generated simulation calculation data has important significance for unit operation mode evaluation, equipment transformation, fault analysis and the like. Therefore, a method with high reliability and low cost is provided for researching the internal flow field of the condenser of the nuclear power plant.
Example two
Based on the same inventive concept, as shown in fig. 2, the invention further provides a three-dimensional simulation computing system for an internal flow field of a condenser of a nuclear power plant, which comprises:
the geometric model establishing unit 210 is used for establishing a three-dimensional geometric model of the nuclear power unit condenser;
specifically, in an embodiment of the invention, according to a condenser drawing, geometric model building is performed on relevant equipment on a condenser body by combining with overall dimension data measured by a three-dimensional measuring instrument on site. Due to the fact that the internal structure of the condenser is complex, the method and the device carry out targeted treatment on each region of the condenser so as to research the influence of the internal complex structure of the condenser on a steam flow field. The condenser mainly comprises a throat part, a heat exchange module, a hot well, a water collecting tank, a flash evaporation tank, a water chamber, a duplex low-pressure heater, a temperature/pressure reducer, a condensed water filtering device, a condenser air extractor and the like, wherein the heat exchange module is core equipment. Further, the three-dimensional geometric model of the condenser established by the model establishing unit comprises an upper throat/lower throat of the condenser, a low-pressure heater, a titanium tube bundle area, an internal partition plate and a steam flow channel.
Specifically, in one embodiment of the invention, the condenser is provided with 4 heat exchange modules, and each module is composed of 14643 titanium tubes with the outer diameter of 25mm and the length of 16541 mm. The middle of each titanium tube is provided with 22 support plates, the span of each support plate is 707mm, and the aperture of each support plate is 25.5 mm. The tube bundle is arranged into a fir-type tube bundle and is divided into a main condensation area and an air cooling area. The tube bundle is divided into a plurality of small steam chambers by the baffle plates along the axial direction, and steam flows in each steam chamber. With the continuous cooling of the steam, the steam outside the pipe is gradually condensed into water by the condensed water inside the pipe. Because the number of the tube bundles is large, the tube bundles are difficult to be modeled in a full three-dimensional mode, and the influence of a large number of tube bundles in the condenser on a steam flow field is simulated by adopting a porous medium model.
The simulation data calculation unit 220 is used for solving simulation calculation data of the internal flow field of the condenser at each position in the three-dimensional geometric model of the condenser by using a computer discrete analysis method according to set operation condition data of the condenser;
specifically, in an embodiment of the present invention, the condenser operation condition data includes a steam flow rate, a steam temperature, a steam pressure, a steam humidity, a circulating water flow rate, a circulating water temperature, and a circulating water pressure. And the flow field distribution inside the condenser can be reflected through the working condition data. Initially, condenser operation condition data are preset, wherein the condenser operation condition data refer to steam flow rate, steam temperature, steam pressure, steam humidity, circulating water flow, circulating water temperature and circulating water pressure at an inlet of a condenser. After the gas enters the condenser, simulation data of the internal flow field of the condenser at a plurality of positions in the three-dimensional geometric model established above can be obtained by a discrete analysis method. Here, the flow field distribution in the three-dimensional geometric model may be subjected to discrete analysis in combination with a momentum equation and a pressure correction equation in fluid mechanics. It should be noted that the process of obtaining the operating condition data by the discrete analysis method belongs to the technical means known to those skilled in the art, and the present invention is not described herein again.
The simulation result analysis unit 230 is configured to compare and analyze simulation calculation data inside the condenser with a critical flow rate threshold requirement, and determine whether a simulation calculation result under the calculation condition meets a safe operation condition of the condenser;
and the simulation model revision unit 240 is used for revising the set condenser operation condition data or the condenser three-dimensional geometric model according to the simulation calculation result.
Specifically, in an embodiment of the present invention, the initially set operating condition data and the three-dimensional geometric model are adjusted according to the steam flow rate at each position of the three-dimensional geometric model obtained through the discrete analysis. Specifically, when the steam flow rate obtained by simulation is too large and exceeds a certain standard requirement (such as ASME) or a critical flow rate required by a condenser manufacturer, the operating condition or the model needs to be revised so that the steam flow rate inside the condenser meets the requirement of the design criterion. No matter the model or the working condition is revised, the requirement of safe and reliable operation of the condenser is met by the internal flow field of the condenser. The revision working condition is mainly that the three-dimensional geometric model of the condenser is unchanged, the parameters of the operation working condition of the condenser are reduced, for example, when the condenser is operated in a single row, the operation power of a unit can be reduced, namely, the steam parameters are reduced, and the flow velocity is analyzed again, which is not acceptable. If the power of the unit is acceptable, the power of the unit at the moment is indicated, and the unit can run for a long time without causing damage to the titanium pipe; the revised model mainly means that the operation condition of the condenser is unchanged, the flow velocity of steam is reduced and is as uniform as possible by changing the structure or the size of the condenser (for example, a guide grid is additionally arranged at an inlet), and finally the steam flow field in the condenser reaches an acceptable level. The model revision is to change the original design of the condenser, so that the structure of the condenser can be improved by researching the throat, and guidance is provided for the modification scheme of the condenser. The operating condition revision is that under the condition that the design of the condenser is not changed, the operating power of the unit is changed, so that the steam parameters are reduced, and the method is a mode for optimizing the operating condition of the unit.
It will be understood by those skilled in the art that all or part of the processes of the above embodiments may be implemented by hardware instructions of a computer program, and the computer program may be stored in a computer-readable storage medium, and when executed, may include processes of the above embodiments of the methods. The storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A three-dimensional simulation calculation method for an internal flow field of a condenser of a nuclear power unit is characterized by comprising the following steps:
s1, establishing a nuclear power unit condenser three-dimensional geometric model;
s2, solving simulation calculation data of the internal flow field of the condenser at each position in the three-dimensional geometric model of the condenser by using a computer discrete analysis method according to set operation condition data of the condenser;
step S3, generating a simulation calculation result when the simulation calculation data meets the convergence condition;
step S4, judging whether the conditions of safe operation of the condenser are met according to the simulation calculation result of the internal flow field of the condenser; if not, revising inlet working condition data or the three-dimensional geometric model of the condenser until the internal flow field of the condenser meets the safe operation condition.
2. The three-dimensional simulation calculation method for the internal flow field of the condenser of the nuclear power generating unit according to claim 1, wherein the three-dimensional geometric model of the condenser established in the step S1 includes upper/lower throats of the condenser, a low-pressure heater, a titanium tube bundle region, an internal partition plate and a steam flow channel.
3. The three-dimensional simulation calculation method for the internal flow field of the condenser of the nuclear power unit as claimed in claim 2, wherein the influence of a titanium tube bundle region on the steam side flow field is simulated through a porous medium model.
4. The three-dimensional simulation calculation method for the internal flow field of the condenser of the nuclear power unit according to claim 1, wherein the operation condition data of the condenser comprises steam flow rate, steam temperature, steam pressure, steam humidity, circulating water flow, circulating water temperature and circulating water pressure.
5. The three-dimensional simulation calculation method for the internal flow field of the condenser of the nuclear power generating unit according to claim 1, wherein in step S4, when the steam flow rate obtained through simulation calculation of the internal flow field of the condenser is greater than the critical steam flow rate threshold value, the operation condition data of the condenser or the three-dimensional geometric model of the condenser is revised.
6. The utility model provides a three-dimensional emulation computational system that is used for nuclear power unit's condenser internal flow field which characterized in that includes:
the geometric model establishing unit is used for establishing a nuclear power unit condenser three-dimensional geometric model;
the simulation data calculation unit is used for solving simulation calculation data of the internal flow field of the condenser at each position in the three-dimensional geometric model of the condenser by using a computer discrete analysis method according to set operation condition data of the condenser;
the simulation result analysis unit is used for comparing and analyzing simulation calculation data inside the condenser and the critical flow rate threshold requirement and judging whether the simulation calculation result under the calculation condition meets the safe operation condition of the condenser;
and the simulation model revision unit is used for revising the set condenser operation condition data or the condenser three-dimensional geometric model according to the simulation calculation result.
7. The three-dimensional simulation calculation system for the internal flow field of the condenser of the nuclear power unit according to claim 6, wherein the three-dimensional geometric model of the condenser established by the geometric model establishing unit comprises an upper/lower throat part of the condenser, a low-pressure heater, a titanium tube bundle area, an internal partition plate and a steam flow channel.
8. The three-dimensional simulation calculation system for the internal flow field of the condenser of the nuclear power unit as claimed in claim 7, wherein the influence of a titanium tube bundle region on the steam side flow field is simulated through a porous medium model.
9. The three-dimensional simulation calculation system for the internal flow field of the condenser of the nuclear power unit as claimed in claim 6, wherein the operation condition data of the condenser comprises steam flow rate, steam temperature, steam pressure, steam humidity, circulating water flow, circulating water temperature and circulating water pressure.
10. The three-dimensional simulation computing system for the internal flow field of the condenser of the nuclear power generating unit according to claim 6, wherein the simulation model revision unit revises the set condenser operation condition data or the condenser three-dimensional geometric model when the steam flow rate of the simulation data of the internal flow field of the condenser is greater than a steam flow rate threshold value.
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| US20180174490A1 (en) * | 2016-12-15 | 2018-06-21 | The Brigham And Women's Hospital, Inc. | Methods and systems for generating fluid simulation models |
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