Research On Thermal Economic Analysis And Optimization Of Secondary Loop System In Nuclear Power Plant

In order to achieve the goal of "carbon peak and carbon neutralization",we need to pay attention to the transformation of energy production and consumption structure,especially the development and utilization of new energy.Nuclear energy,as a clean energy,is an indispensable energy choice.Although nuclear energy is a carbon free energy and has the advantages of high energy density,the economy of nuclear power plants is still a very important indicator,so the thermal economy of the nuclear power unit also needs to be considered.Therefore,the research on the calculation,analysis and optimization of thermal economy of the secondary thermal system of nuclear power plant is of great significance.In this paper,the secondary loop system of 900 MW PWR nuclear power plant is selected as the research object.The calculation method of thermal economy matrix method,and the optimization design calculation method of thermal economy of the secondary loop system are studied.Firstly,based on the investigation of relevant literature at home and abroad,this paper summarizes the research status of thermal economy analysis,optimization methods and the application status of optimization methods in the field of nuclear energy,analyzes and expounds the shortcomings of relevant research,and puts forward the main research content of this paper.Secondly,from the most basic heat balance equation,the thermal economy analysis model of constant flow matrix method and the thermal economy analysis model of constant power matrix method are deduced in detail,the mathematical relationship between constant flow matrix method and constant flow matrix method is expounded,and the convenient conversion method of the two method matrix methods is given.Then,the internal relationship and correctness of the models of constant flow matrix method and constant power matrix method are verified by calculation.Then,the application calculation of the model is carried out by using the matrix method.The economic analysis of isolated operation of high-pressure heater and the economic comparison of different driving schemes of feed pump are analyzed by using the constant flow method.Finally,the new Harris Hawks Optimization is described and programmed.Using this algorithm,the optimal design and calculation of the maximization of circulating thermal efficiency under the condition of constant power and the dual objective optimal design and calculation of circulating power and circulating thermal efficiency under the condition of constant flow are carried out respectively.The relevant optimization objectives after the two optimization calculations have been improved accordingly.