Design Optimization Of Parameter In Nuclear Power Plant

Compared with the fossil fuel power plant, the nuclear power plants have many unmatchable advantages such as higher concentration of energy, oxygen unneeded. However, the nuclear power plants always take relatively bulky dimension and occupy larger space, which have been one of the major problems that limit the development of nuclear power plants. At present, as far as the volume, the weight and compact layout are concerned, how to reduce the weight and the dimension has become one of the most important guidelines to evaluate the design rationality of nuclear power plant. Furthermore, in this paper, in order to minimize the volume or the weight of nuclear power plant, the research on reducing the weight and the volume are carried out by optimizing the parameters of the nuclear power plants based on the optimization theory. The main contents are:1,Considering the characteristics of optimization problems in nuclear power plant, the complex algorithm is improved based on the complex algorithm which can bring about the localized optimization. And the modified complex algorithm is presented in this paper.2,A method, combined with optimization theory and heat transfer enhancement technology, is presented for achieving the miniaturization of heat transfer equipments in nuclear power plant. Based on experimental research, the optimal size which minimizes the single-tube volume of flat tube is calculated in the same heat transfer quantum and pump power. The results show that the volume of flat-tube with the optimal size can be reduced by 46.4% in comparison with circular tube under same conditions.3,The mathematical models of reactor thermal-hydraulic and pressurizer weight-volume calculation are presented, and the assessment codes are developed with C# language. The verification and the validation of mathematical model are proved through the comparison between the results from the evaluation codes and the reference model, which also show that the codes satisfy accuracy requirements.4,The differences of optimization design results between coupled-devices and single component are discussed. The result indicates that the components have their own functions and a considerable coupling degree simultaneously, which means that the components affect each other. In order to achieve global optimization, the optimization of each component should be actualized simultaneously.5,The sum of the weight of the core pressure vessels, pressurizer, two steam generators, four main coolant pumps, steam turbine and two condensers and their volumes are set as the total weights and volumes of a nuclear power plant.Firstly, five system parameters are selected as the optimization variables, including primary loop operating pressure, reactor coolant inlet temperature, core coolant flow rate, saturated steam pressure of the stream generator and condenser pressure. The improved complex algorithm is used to optimize the total weight and volume respectively under the given constrained conditions. Compared with the reference, the results show that the total weight and total volume can be reduced by 5.61% and 8.09% respectively. Above five operating parameters and other three structure parameters (pressurizer inner diameter, heat transfer tube outer diameter of steam generator and heat transfer tube outer diameter of condenser) are tried to set as the optimization variables. And the optimal designs of system's total weight and volume are carried out. The optimized results indicate that the total weight and the total volume of the system are reduced by 9.16% and 12.15% respectively. The optimal combination of system parameters can be obtained by optimizing nuclear power system's parameters, which can reduce the weight and volume of the power plants effectively and realize the miniaturization.