| Considering a large share of coal in China's energy consumption structure,research on coal-fired thermal power plants is particularly important.In order to reach high-efficiency working condition,discuss the influence of solar energy and its operating characteristics in supercritical state,solar system and supercritical steam thermal system(SSTS)are combined to.In this paper,the solar aided coal-fired supercritical steam thermal system(SACSSTS)uses a double-tank heat storage system to increase the stability of solar tower system,and two heat exchangers to transfer heat from molten salt in solar tower system to steam in supercritical coal-fired thermal system.TRNSYS is applied as a platform to establish the model of SACSSTS.After verification of this integration scheme,local weather data is imported to simulate one year's operation of SACSSTS under design and off-design working conditions.The variation of heat transferred from solar system to supercritical steam thermal system,generated power from SSTS,solar-electrical generation capacity,efficiency and proportion are compared and analyzed.In conclusion,solar tower steam generation system will increase the capacity of SSTS while reduce its thermal electrical efficiency.When boiler steam flow rate is maintained at less than reference flow rate,after joining by solar steam flow rate,total steam flow rate exceeds the reference flow rate,while solar steam flow rate increases,thermal electrical efficiency might increase but doesn't exceed reference efficiency. |
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