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大型燃煤电站机炉耦合热集成系统

DOI: 10.13334/j.0258-8013.pcsee.2014.02.015, PP. 375-382

Keywords: 燃煤电站,机炉耦合,热集成,综合优化,余热利用,热力学分析,技术经济性

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Abstract:

针对传统电站机炉两侧在热质传递过程中均存在的“能级不匹配”现象。文中提出一种新型机炉耦合热集成系统,该系统基于炉侧空气吸热过程、汽轮机回热过程的能量品位变化规律,提出将炉侧与汽机侧的吸热和放热过程充分交叉融合,通过机炉之间烟气、蒸汽、给水和空气等多工质传热过程间的充分集成,更好地实现空气预热过程和回热加热过程的能量梯级利用。结合某典型1000MW超超临界燃煤机组的实际运行数据,分析了新型热集成系统的传热特性和节能收益。结果表明:新型热集成系统可使机组供电煤耗降低4.02g/(kW?h),年节煤收益达1525.49万元,系统节能效益显著。

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