【摘要】 近年可再生能源并网数量激增，对电力系统灵活性提出严峻挑战，使用熔盐储热辅助电力系统调峰被许多学者重点研究。本文基于德国STEAG电力集团开发的Ebsilon 16.4版本软件，通过数值模拟的方法，耦合熔盐储热与超临界二氧化碳热力循环系统。研究该模型在50%热耗率验收（turbine heat acceptance,THA）工况时，不同抽气位置下，抽气比例变化对机组负荷的影响，最终使系统达到锅炉负荷50%，机组负荷30%的调峰目标。结果表明：抽取主流工质对系统负荷影响较大，但是不能满足调峰要求；抽取再热工质对系统负荷影响较小；单独抽取主流工质或再热工质都不能满足调峰要求，需要将两者结合，共同抽气；超临界二氧化碳循环与蒸汽循环方式不同，释热工况下无法提升机组负荷，但是可以利用熔盐热量节省燃煤消耗。总结得出：超临界二氧化碳与熔盐储热耦合，在储热工况下，可以有效调节机组负荷，增大调峰深度；释热工况下降低煤耗，提升经济性；但是由于超临界二氧化碳的循环温度较高，释热过程会造成能量损失。更多还原

【Abstract】 In recent years, the number of renewable energy connected to the grid has increased rapidly, which poses a severe challenge to the flexibility of power system. The use of molten salt heat storage assisted power system peak balancing has been focused on by many scholars. In this paper, based on Ebsilon 16.4 software developed by STEAG electric Power Group in Germany, through numerical simulation, fused salt heat storage and supercritical carbon dioxide thermal cycle system were coupled. This paper studied the effect of pumping ratio change on unit load under different pumping position under 50%THA condition, and finally made the system reach the peak load of 50% boiler load and30% unit load. The results showed that the extraction of mainstream working medium had a great influence on the system load, but it could not meet the requirements of peak regulation. Extraction reheat quality has little effect on system load. Extraction of main stream working medium or reheat working medium alone can not meet the requirements of peak regulation, it is necessary to combine the two to pump gas together. The supercritical carbon dioxide cycle is different from the steam cycle, and the load of the unit cannot be increased under the heat release condition, but the heat of molten salt can be used to save coal consumption. It is concluded that the coupling of supercritical carbon dioxide and molten salt can effectively adjust the unit load and increase the peak load depth under the heat storage condition. Reduce coal consumption and improve economy under heat release condition. However, due to the high circulating temperature of supercritical carbon dioxide, the heat release process will cause energy loss.更多还原