A Structure-Based Refined Simulation Method for High Pressure Feedwater Heater in Nuclear Power Plant

Abstract

The invention provides a structure-based fine simulation method for a high-pressure water supply heater in a nuclear power plant. The high-pressure water supply heater in the nuclear power plant is divided into eight sub-model areas according to an actual physical structure, and the steam condensation area and the drainage cooling area in the sub-model areas are divided into a plurality of segments in a more detailed mode according to the actual pipe row and partition forms; simulation sub-module programs of the areas are established correspondingly according to the heat transfer and flowing characteristics in the segments; model input parameters are combined, and checking, feedback and correcting are conducted; and combination and dispatching are conducted through a main program to generate a corresponding calculation sequence and a calling sequence, and thus a structure-based fine simulation model of the high-pressure water supply heater in the nuclear power plant is built. The structure-based fine simulation method does not need to depend on the specific parameters of any high-pressure water supply heater equipment in the nuclear power plant, can be applied to the high-pressurewater supply heater equipment with the various parameters and forms in the nuclear power plants under general conditions, and has good universality.

Description

technical field [0001] The invention relates to a simulation method based on an actual physical structure, in particular to a simulation method for a high-pressure feed water heater in a secondary circuit system of a pressurized water reactor nuclear power plant. Background technique [0002] The high-pressure feed water heater of a nuclear power plant is an important part of the secondary circuit system. The feed water of the feed water heater is heated by the saturated steam discharged from the steam turbine. The presence of feedwater heaters allows the efficiency of nuclear power plants to be increased. The commonly used heaters in nuclear power plants are shell-and-tube dual-flow feedwater heaters. The structure of the high-pressure feedwater heater is relatively complex, and there is wet saturated steam on the shell side, and there is a two-phase flow and heat transfer, and single-phase unsaturated water on the tube side. Generally, the simulation modeling research o...

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Problems solved by technology

Generally, the simulation modeling research of nuclear power plant feedwater heaters is often conducted using the lumped parameter method. The feedwater heater area is divided less, and the parameters in each area are calculated uniformly. For the feedwater heater heat transfer tube, the tube bundle is simplified. Modeling and simulating a pipe makes it difficult to guarantee the accuracy of the calculation

In this simulation model, only the parameters of the required positions are often calculated, and the parameters of other positions in the feed water heater are simplified, which cannot reflect the overall parameter distribution of the feed water heater

Moreover, it is often necessary to carry out separate simulations for nuclear power plant high-pressure feedwater heaters of different forms, types, and parameters. The established simulation models have poor versatility and are difficult to apply to different equipment objects after modification. The simulation model needs to be rebuilt

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