Two-stage Solar Power Tower System And Cavity Receiver Design

Solar power Tower technology is a very promising application technology, due to high temperature in the solar concentrating tower, can obtain higher thermo-electric conversion efficiency than the other several kinds of solar thermal power generation. At the same time, the technology is also a kind of promising technology suitable for large capacity power generation equipment.At present, Solar power Tower generation technology has been close to the mass and widely application.Firstly, this paper proposes a two-stage solar power tower on the basis of solar power tower research at home and abroad. The system mainly includes the heliostat field, heat absorber â… , water-steam separation device, heat absorber â…¡, gas afterburning device, heat storage system and power generation system. The subsystems are introduced, and the analysis method to calculate the energy of the system is given.Then, analyze the operation of two-stage solar power tower system. solar power tower system should consider the influence of sunlight and working conditions at running time, divides the operation of system into four kinds of operating modes. Further analyses the water-steam process and calculation methods of each operating mode, and calculate the relationship between flow rate and sunlight condition, the medium dry degree of recriver I exit and heat storage change under different sunlight condition and heat load. It is concluded that different operation mode distribution in different sunlight and working conditions, making the adjustment of the system more intuitive.Finally,build the radiation heat transfer model of the receiver, analyze the relation between the geometry size and heat transfer effect, discuss the method for determining the heat absorber geometry size. By analyzing the heat absorber Angle coefficient, average heat load and the windowing theory conversion temperature, the influence of the heat absorber size is determined. Analyzing the characteristics of the gas-liquid two phase flow and the hydrodynamic calculation of receiver,, determine the pipeline arrangement optimization of heating surface.