Design And Optimization On Two-stage Cavity Receivers Of Solar Power Tower System

Compared with several other solar thermal power technologies, solar thermal power tower technology is capable of heating working fluid to a hightemperature,have a high effciiency and is very promising, As a key conversion equipment of solar thermal power tower technology, receiver works in high changed heat flux. Its safety operational gets international great attention.The traditional solar thermal power tower system which use water as heat transfer fluid has been improved in this paper.This paper proposes a two-stage solar thermal power tower system.The system can solve the problem of two-phase flow instability and burning damage of overheating surface.This paper introduces the design method of the two-stage solar power tower system and two-stage saturated and superheatedreceiver system. The design include the shape and internal piping arrangement.The shape has connection with angular coefficient.Piping layout design has connection with the desired stats of the working fluid. By analyzing the steam and water process inside the heating surface of cavity receiver,the paper calculates the relationship between heat transfer coefficient、 pressure drop> wall temperature and tube diameter of This paper receiver I and receiver II.This paper calculates the amount of steam and thermodynamic dryness.Finally, build the radiation heat transfer model of the receiver, analyze the relation between the geometry size and heat transfer effect, determine the proper aspect ratio, the shape of the cavity receiver by the total amount of radiation and the average heat flux. the heat transfer pressure drop and pipe wall temperature calculation were carried out, determine the piping arrangement inside the heating surface based on the gas-liquid two-phase flow characteristics.