Mid and Low-temperature Solar-Coal Hybridization Mechanism and Validation
A higher solar-to-electricity conversion efficiency was one of the major advantages of the solar-fossil hybrid power generation systems compared to the solar-only power plants.In this paper,a new mechanism to reveal the reasons for the improved solar-to-electricity efficiency in a solar hybrid power plant was given based on the first and second law thermodynamics.A correlation was built to describe the main performance influencing factors with the higher collector efficiency,the higher turbine internal efficiency and the upgraded energy-level of the mid-temperature solar heat.This proposed mechanism can be used to effectively integrate solar-coal hybridization system with a high efficiency.A case study was taken as the typical 200 MW coal-fired power plant hybridized with solar heat at approximately 300°C,where the solar thermal energy was used to preheat the feed water before entering the boiler.Furthermore,simulation results of the net solar-to-electricity efficiency of the mid-and low-temperature solar hybridization system was conducted to prove the proposed mechanism.It is expected that the theoretical values have a good agreement with the simulation ones.The results obtained here indicate that the development of mid-and low-temperature solar-coal hybridization technology may provide a promising and new direction to efficient utilization of low-grade solar thermal energy,and provide the direction to enhance the system performances of this kind of solar–coal hybrid power plants.
Mechanism Validation Solar-Coal Hybridization Mid-and Low-Temperature Solar-to-Electricity Efficiency
Yawen Zhao Hui Hong Hongguang Jin
Institute of Engineering Thermophysics,Chinese Academy of Sciences P.O.BOX 2706,Beijing 100190,P.R.China
国际会议
桂林
英文
1-17
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）