| In order to save the fossil energy and protect the environment,the solar aided coal-fired power generation system has developed rapidly.The integration scheme of solar power tower and conventional 660 MW coal-fired power plant in Dunhuang is proposed.Based on the simulation platform TRNSYS,the model of the solar-hybrid coal-fired power generation system is established.According to the meteorological database in TRNSYS software,the simulation and analysis of the hybrid system under different solar radiation intensity and different turbine loads are carried out with the operating mode of coal saving.The thermodynamic performances of typical days and typical year are obtained,and the characteristics of the hybrid system are revealed.Finally,the scale of the solar island is optimized.The results show that the annual solar-to-electric efficiency of the hybrid system up to 16.97%,which with lower cost has a significant advantage over the existing solar-only thermal power generation systems.In this paper,we put forward a new molten salt tower integrated scheme of heating superheated steam and reheat steam.Not only the solar tower heat collector can increase the heat collecting temperature of the solar energy,the integration scheme of two sections of overheated and reheat can avoid the case that the fluctuation of solar heat into coal-fired units affect the normal operation of steam turbine.In this paper,the high temperature utilization of solar energy is more advantageous than the traditional integration method.This paper aims to find a new way to retrofit the existing conventional coal-fired power plants,to provide some theoretical reference as well. |
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