Numerical Simulation Of Auxiliary Heating On Solar Thermal Power Generation System

Due to the continuous development of social and economic, energy demand continues togrow. What’s more, petrochemical resources is limited on earth, accompanied by increasinglyserious environmental problems, which makes the demand of social and economic activities fornew energy and renewable energy is increasing. Solar energy as a clean energy has been widelyused in various forms, and the solar thermal power generation system is a new way to achievelarge-scale development and utilization of solar energy, also to solve the world’s energy crisisand environmental crisis one effective way. Assuming the solar thermal power generationtechnology is grown, will provide unlimited power energy for China’s western development,which can promote the development of solar energy industry.The solar thermal power generation system mainly consists of four major components ofdiversion chimney, collector shed, storage layer and turbine generator sets. Its running processis a storage layer absorbs solar radiation, at the same time the air of the upper surface of thestorage layer for heat exchange inside the collector shed, in order to raise the temperature of theair inside the collector shed and bring the air together to the bottom of the chimney. With theassistance of the chimney effect, forming a strong updraft and pushing the bottom chimneyturbine generators, the kinetic energy is converted into mechanical energy.The paper focuses on the optimization of the solar thermal power generation system inGolden Bay of Wuhai of Inner Mongolia in China. Increased heating element inside thechimney, reduced the height of the chimney without reducing the power generation efficiency,to save the initial investment cost. Three-dimensional models of structural and non-structuralmesh grid to build a physical model of this system. For three different variables, such astemperature of air of auxiliary heating, mass of air of auxiliary heating and location of auxiliaryheating, using FLUENT software simulation analysis. Studied the optimization of the positionof auxiliary heating of auxiliary heating on solar thermal power generation system, and by the enthalpy analysis for auxiliary heating gas temperature and the intake air mass is determined toprovide a reference. Through the paper to get some meaningful conclusions:①. Auxiliaryheating gas enthalpy change, there is a certain influence on the velocity field inside the chimney.Auxiliary heating position45m, the enthalpy change from50×103kJ/s to90×103kJ/s, theaverage speed of the bottom of the chimney than without auxiliary heating increased from52%to80%. And for every10m below the position of auxiliary heating, the bottom of the chimneyabout the relative speed will increase by7%to15%, thus improving the suction capacity of thesystem.②. When determining the position of the auxiliary heating, the enthalpy of the gas ofauxiliary heating has an optimal range, can increase the kinetic energy of the bottom of thechimney reaches an optimal value. When lowered position of auxiliary heating, enthalpy ofoptimal range and the ratio of enthalpy and kinetic are changed. Therefore, for every10m belowthe position of auxiliary heating, enthalpy decreases optimal range of about10×103kJ/s. Andconstants of the ratio of enthalpy and kinetic reduced by about200to250.③. Whendetermining the enthalpy of the gas into the chimney, the position of the auxiliary heating has asuitable height. Before the maximum kinetic energy of the bottom area of the chimney, will notdamage the pressure field in the work area of turbine unit.