Near-far zone coupling numerical simulation method suitable for thermal drainage and deepwater discharge in nuclear power plant

A numerical simulation and temperature drainage technology, which is applied in CAD numerical modeling, general water supply saving, electrical digital data processing, etc., can solve the problems that the near area and far area cannot be simulated at the same time, so as to ensure the conservation of water flow quality and improve the simulation accuracy Effect

Active Publication Date: 2017-02-22
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

The method described aims at the research object of thermal power and nuclear power plant temperature and drainage near and far zone dilution and diffusion, establishes a three-dimensional mathematical model of temperature and drainage in the far zone and an empirical mathematical mod

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  • Near-far zone coupling numerical simulation method suitable for thermal drainage and deepwater discharge in nuclear power plant
  • Near-far zone coupling numerical simulation method suitable for thermal drainage and deepwater discharge in nuclear power plant
  • Near-far zone coupling numerical simulation method suitable for thermal drainage and deepwater discharge in nuclear power plant

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Embodiment 1

[0039] This embodiment is a near-far area coupling simulation method for power plant thermal drainage and deep water discharge. The process is as follows figure 1 shown. This embodiment is an algorithm process that can be compiled as a computer program, and the hardware used for calculation can be a general computer workstation or other electronic digital computing systems with digital storage and computing capabilities.

[0040] In this embodiment, different models are used to simulate the jet dilution process in the near area of ​​warm water and the environmental flow dilution process in the far area. The jet integral model is used in the near area, and the three-dimensional hydrodynamic mathematical model is used in the far area. The calculation environment parameters in the far area transfer parameters to the near area, and the near area transfers the parameters to the far area through the form of source terms, and realizes the dynamic coupling simulation of the dilution a...

Embodiment 2

[0079] This embodiment is an improvement of the first embodiment, and it is a refinement of the model in the first embodiment. The near zone model described in this embodiment is a Corjet model, and the far zone model is a Delft3D three-dimensional hydrodynamic model.

[0080] The Corjet model obtains the jet trajectory and the dilution along the jet by solving the integral equation of the jet in infinite water. For the outflow of a single nozzle, it is easier to obtain the distribution of dilution along the near-zone model; for the outflow of multiple nozzles, since each nozzle has its own trajectory at the initial outflow, there is cross influence after a certain distance. Generally, there are two processing methods for area simulation: one is to ignore the jets that do not intersect with each other, and the outflow is equivalent to a line source outflow, which is suitable for the case of small momentum and large density difference; the other is to discharge multiple jets I...

Embodiment 3

[0082] This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the model of the above-mentioned embodiment. The solution time step of the far zone model described in this embodiment is 15 seconds, and the calling time interval of the near zone model is 5 minutes.

[0083] The time step for solving the far zone model is the discrete step length in time when the model equation is solved, which is a parameter to ensure the stability and accuracy of the numerical solution. If the time step is too large, the calculation may diverge, and if the time step is too small, the calculation cost will increase. The calling time interval of the near-area model is the length of the interval for the near-area model to solve the source item and transmit it to the far-area model. This interval reflects the impact of changes in far-area environmental parameters on the calculation of the near-area model. The capture of time-varying characteristics of parameters ...

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Abstract

The invention relates to a near-far zone coupling numerical simulation method suitable for thermal drainage and deepwater discharge in a nuclear power plant. The near-far zone coupling numerical simulation method comprises the following steps: establishing a far zone model; starting the far zone model; calculating the far zone model; invoking and judging a near zone model; performing model conversion; generating a near zone jet on-way flow rate and a concentration source term; finishing the judgment of the far zone model. The near-far zone coupling numerical simulation method provided by the invention has the benefits that the near zone floating jet dilution process is stimulated by adopting a near zone jet integral model, a source term calculation formula for converting a near zone model calculation result into an input far zone model through a decentralized convergence method is provided, and a method of dynamic coupling of the near-far zone mathematical models is provided. The degree of dilution in the hot water rising process and at the final rising height as well as the source term can be more reasonably reflected through the provided near-far zone coupling model method; meanwhile, the water flow quality conservation can be ensured, the simulation precision within a surface high-temperature rise affecting range is obviously improved, and a useful scientific basis is provided for accurate evaluation on the environmental impact of thermal drainage and discharge in the nuclear power plant.

Description

technical field [0001] The invention relates to a near-far area coupling numerical simulation method for thermal drainage and deep water discharge of a power plant. It is suitable for the simulation calculation method of the temperature rise diffusion range of nuclear power plant and thermal power plant warm water and deep water discharge. Background technique [0002] The rise of water temperature in local sea areas caused by thermal drainage is an important environmental problem faced by thermal and nuclear power plants. Dilution of warm drainage in receiving waters is divided into near-zone dilution and far-zone dilution processes. The two processes are very different in space and time scales. It is very difficult to use the same model to simulate both near and far zones. The method used in the past is to use model tests or empirical jet models in the near area to solve the problem of initial dilution in the near area. The model cannot accurately simulate the dilution an...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10Y02A20/152
Inventor 陈小莉纪平张强刘彦赵懿珺袁珏张海文曾利梁洪华
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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