Analysis Of Trough Solar Collector Aided Coal-fired Power Generation System

Because of the traditional energy shortage and the intensified Environmental pollution,the utilization of solar energy has been paid more and more attention.However,considering the instability of solar energy and the huge investment and low efficiency of solar thermal power plant,while the traditional coal-fired power generation system is not friendly to the environment,sothis paper puts forward that the solar collector field aided traditional coal power generation,and the thermal performance of the cooperative system is studied.The thesis contained the following sections:In the first part,a system model of solar economizer aided coal power generationbased on the Matlab / Simulink simulation model of trough solar collectors and coal-fired power plant system is established.The influence of the input energy of the solar field on the performance of the boiler under the supercritical and subcritical conditions of steady-state operating conditions was studied by simulation.The simulation results are as follows: when the solar input reached 132014 kw and 64601 kw,respectively,the boiler supercritical and subcritical conditions changed into a dangerous state.The operating efficiency of the boiler decreases with the increase of the input energy of the solar field.Under the supercritical and subcritical conditions,the maximum descending rate is 2.48% and 3.12% respectively.The decline rate of boiler efficiency in subcritical steady state is higher than that in supercritical steady state.In the second part,the simulation model of the solar secondary reheater adied coal power plant system is established.The limit value of the secondary reheat temperature of the synergistic system is judged by the characteristic flow area method.Then,according to the thermodynamic performance index,The thermal performance of the whole cooperative system under different working conditions is calculated and the following conclusions are obtained:the rise of the secondary reheat temperature should not exceed 100℃ in order to ensure the safe operation of the cooperative system.Under different conditions,the solar photoelectric conversion efficiency of the whole synergistic system is more than 25% and increases with the increase of secondary reheating temperature.The research results of this paper have some reference significance for the study of solar aided coal power generation system,which laid a foundation for the future application of solar energy adied conventional coal-fired generating units.