Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
This study aims to achieve high-accuracy exergy distribution analysis of the NPP thermal system, providing a more reasonable reference for optimizing devices and conserving energy. Firstly, by using the first and second law of thermodynamics, the modular model of each component in NPP is established. To improve the accuracy, an elaborate model is built to calculate the reactor core's efficiency; the type of steam generator is innovatively in consideration (the natural recirculating steam generator and once-through steam generator); the turbine’s seal leakage which corresponds to section area of seal radial clearance, throttles number is in consideration; the extraction pipe’s steam parameters under off-design conditions are confirmed by the modified flugel formula. Also, for the pipeline, the equation of exergy loss which only needs the inlet pressure and temperature is derived. The overall model of the whole system can be obtained through a regular combination of these component models. Secondly, a simple and efficient model is established using C++ programming, the input parameters for each device are operating pressure, temperature, inlet, and outlet flow rate, and thermodynamic equilibrium quality. Then, a typical pressured water reactor is applied for simulation, the main parameters of NPP streamlines are determined and the exergy destruction coefficient and exergy efficiency of each component are obtained. This paper laid a foundation for establishing the general system exergy analysis model of pressured power reactors and the results show that the model is accurate and efficient.
