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某电厂联合循环汽轮机启动过程优化

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Keywords: 联合循环,汽轮机启动过程,暖机操作,转子应力,低周疲劳寿命损耗

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Abstract:

燃气/蒸汽联合循环机组中汽轮机启动时间较长,导致联合循环机组不能及时响应电网调峰需求。为此,通过数值实验和现场启动试验相结合的方法研究了汽轮机的启动过程。建立汽轮机转子二维轴对称有限元模型,确定非线性边界条件,通过数值模拟研究启动过程各暖机操作对转子应力的影响。基于数值实验分析结果,结合试验机组结构、运行特点,制定优化后的启动过程。温态启动时汽轮机转子最大应力降低11MPa,启动时间缩短36min,低周疲劳寿命损耗减少0;0008%;冷态启动时转子最大应力降低261MPa,启动时间缩短32min,低周疲劳寿命损耗减少0;0197%。

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