基于储热的燃煤机组深度调峰规模化消纳可再生能源发电研究  

Research on large-scale renewable energy power consumption by peak shaving system of coal-fired power unit integrated with thermal energy storage

作　　者：魏海姣 鹿院卫[1,2] 刘金恺 吴玉庭[1,2] WEI Haijiao;LU Yuanwei;LIU Jinkai;WU Yuting(Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China;MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing 100124,China)

机构地区：[1]北京工业大学环境与生命学部,北京100124 [2]传热强化与过程节能教育部重点实验室及传热与能源利用北京市重点实验室,北京100124

出　　处：《热力发电》2023年第2期79-89,共11页Thermal Power Generation

基　　金：国家自然科学基金项目(52076006)。

摘　　要：随着可再生能源装机容量的不断增加,为减少可再生能源发电与燃煤机组发电间上网电量不匹配产生的“弃风弃光”现象,燃煤机组需实现深度调峰为可再生上网源提供空间,同时还应进一步提高消纳可再生能源的能力。利用再热蒸汽抽汽储热深度调峰系统将可再生能源发电、熔盐储热与燃煤机组降负荷调峰时的蒸汽抽汽储热耦合,研究基于储热的燃煤机组深度调峰规模化消纳可再生能源发电系统的可行性及可再生能源发电储热对深度调峰性能的影响,并分析系统的综合发电煤耗和碳排放的变化规律。研究结果表明:当再热蒸汽抽汽流量为270.70 t/h时,燃煤机组发电功率由300.03 MW降至210.07 MW,储热系统可消纳可再生能源发电的最大功率为187.26 MW;存热量释放时,燃煤机组发电功率由300.03 MW增加至348.68 MW;单位时间消纳可再生能源发电量为187.26 MWh时,综合发电煤耗降低了8.49 g/k Wh,减少的CO_(2)排放量为28.23 t。该研究为高比例可再生能源发电的消纳提供了指导思路。In order to reduce the phenomenon of “wind and solar energy power abandonment” caused by the mismatch between the on-grid electricity generated by renewable energy power and coal-fired power unit, the coalfired power unit needs to achieve the deep peak shaving to provide the grid space for renewable energy power with the continuous increase of the installed capacity of renewable energy. At the same time, the coal-fired power unit provides the ability to further consume renewable energy power. The utilization of coupling reheated steam extraction with thermal energy storage and molten salt thermal energy storage heated by renewable energy power in deep peak shaving system of coal-fired power unit is proposed. The research on large-scale renewable energy power consumption by peak shaving system of coal-fired power unit integrated with thermal energy storage is discussed. Moreover, the comprehensive coal consumption for power generation and the CO_(2)emission is analyzed. The results show that, the power output of the coal-fired unit decreases from 300.03 MW to 210.07 MW when the reheated steam extraction mass flowrate is 270.70 t/h, and the maximum power of renewable energy power consumption by thermal energy storage system is 187.26 MW. When the stored heat is released, the power output of coal-fired unit increases from 300.03 MW to 348.68 MW. When the renewable energy power consumption per unit time is 187.26 MWh, the comprehensive coal consumption for power generation is reduced by 8.49 g/k Wh and the CO_(2) emission is reduced by 28.23 t. This study provides a guiding idea for the absorption of high-proportion renewable energy power.

关 键 词：燃煤机组 抽汽 储热 深度调峰 消纳可再生能源发电 

分 类 号：TM621[电气工程—电力系统及自动化]