Performance Research Of CPC Solar Energy Collectors And Analysis On Auxiliary Heat System Of Condensation Water

Solar energy as an inexhaustible, incessant use and renewable energy, will be at a crucial position as an alternative energy in the future. Solar energy collectors are key parts in solar thermal utilization. Compound parabolic solar energy collectors are used in the field of medium temperature, runing without a tracking device,will have more wider application prospect. In this paper, the performance of the CR-CPC solar energy collector and the FHR-CPC solar energy collector were analyzed and studied the solar collectors'application in the regenerative system of the power plant.This paper analyzed the operating rules of the sun and the parameters determined the radiation at the first. And established the solar radiation calculation model, calculated solar radiation intensity every hour on the four typical days a year in the western city of Lanzhou. Two collectors were given the parameters of equations, the structure of the collectors were analyzed. The sun rays inside the collector were tracked by the optical software TracePro. Optical path diagram inside the collectors and the energy flux density distribution on the collector absorbers were obtained every hour on four typical days, and they were compared. The results showed that the performance of the CR-CPC solar energy collector was better than the FHR-CPC solar energy collector.The heat transfer process inside the CR-CPC solar energy collector was analysised, and gived the formula of collector instantaneous thermal efficiency. Using Fluent software simulated the temperature distribution inside the collector and influencing factors of the flow working outlet temperature.The CR-CPC type solar energy collectors were used in the regenerative system of the generating units. Through theoretical analysis, the method of solar energy collectors auxiliary heating condensated water was studied. A 300MW unit was builded as an example of solar energy collectors assisted heating condensated water system, in order to realize partial substitution low-pressure steam extraction heating condensated water system. Thermal parameters of the system and thermal economic index of the auxiliary heating system were analysised and calculated in the original condition. Thermal economic of the solar energy assisted heating system were analysis. Energy conservation and carbon emission reduction of the solar energy assisted heating system were analyzed. This paper provided a reference for the research of the solar energy used in the regenerative system of the power plant, and had significance of engineering practice.