Investigation On The Performance Of Cascade Integrated Solar Combined Cycle System

With the rapid development of society,the level of energy consumption has exploded and the problem of energy shortage has become increasingly serious.Therefore,it is imperative to change the traditional ways of energy utilization and accelerate the development and utilization of green energy.Compared with fossil fuels,solar energy has the advantages of great potential for development,environmental protection and sustainable utilization.However,the utilization of solar energy is greatly influenced by the environment itself,resulting in higher costs of solar thermal power generation and more favorable conditions for building.Solar power plant construction conditions are more stringent.This paper focuses on the new combined cycle system,starting with the matching of energy grade,studing the integration mechanism of the new classification system and the system operating conditions under changing conditions,in order to improve the system conversion efficiency,providing a new idea of the integrated solar combined cycle.The details are as follows:(1)Research on the integrated solar combined cycle system’s Variable operating conditions.Based on the principle of energy cascade,the solar collector is coupled with each subsystem of conventional combined cycle according to the solar collector temperature and grade,and a new scheme of ISCC is put forward to realize the conversion of solar thermal efficiently.Based on the hierarchical integrated solar combined cycle,through the establishment of the calculation model,for time-varying characteristics of the solar energy,researching the operation of the system under varying working conditions,putting forward a variety of integration methods and optimizing the share of solar collector field water.Improve the heat exchange performance of the waste heat boiler and achieve efficient conversion of the heat power,providing theoretical guidance for the calculation of the variable working condition of the integrated solar-gas steam cycle system.(2)Thermoeconomics is the combination of analytical methods and economic analysis methods,to more three-dimensional analysis and solve complex problems in complex systems.The flow of energy and exergy herein of solar energy with the cost of conventional energy sources combined,from the two aspects of energy environment and economic environment,this paper analyzes the flow distribution,energy utilization and economic cost of each subsystem in the integrated system.In order to determine the direction of optimization of integrated systems to achieve optimal integration of system operation and improve efficiency.