基于运行数据的汽轮机调节级变工况特性建模
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摘要
通过忽略汽轮机调节级的反动度,提出一种推算调节阀后压力和温度的方法,为利用汽轮机实际运行数据建立调节级变工况特性的数学模型奠定了基础。针对某电厂330 MW汽轮机,根据阀门的开闭状态进行分组,利用所提出的方法建立并验证了在顺序阀运行方式下调节级的主导因素模型,在全工况范围内计算了调节级变工况的流量特性参数和效率特性参数。结果表明:模型能够准确计算调节级后的压力和温度,验证了所提出方法的可靠性。
By neglecting the reaction degree of steam turbine control stage, an algorithm was proposed for estimating the pressure and temperature after control valve, which laid a foundation for establishing a mathematical model of the control stage under variable conditions using actual operating data of the turbine. For the 330 MW steam turbine of a power plant, according to the opening and closing state of the valve, a dominant factor model was established and verified for the control stage in the sequential valve operation mode based on the method proposed, and subsequently, the flow rate and efficiency characteristics of the control stage were calculated within the full condition range. Results show that the model can accurately calculate the pressure and temperature after the control stage, which proves the proposed method to be reliabile.
By neglecting the reaction degree of steam turbine control stage, an algorithm was proposed for estimating the pressure and temperature after control valve, which laid a foundation for establishing a mathematical model of the control stage under variable conditions using actual operating data of the turbine. For the 330 MW steam turbine of a power plant, according to the opening and closing state of the valve, a dominant factor model was established and verified for the control stage in the sequential valve operation mode based on the method proposed, and subsequently, the flow rate and efficiency characteristics of the control stage were calculated within the full condition range. Results show that the model can accurately calculate the pressure and temperature after the control stage, which proves the proposed method to be reliabile.
引文
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[2] 李勇,徐世明,单丽清.汽轮机调节级通用特性曲线计算方法分析与研究[J].汽轮机技术,2013,55(5):343-346.LI Yong,XU Shiming,SHAN Liqing.Analysis and research on the calculation method of universal characteristic curves of steam turbine's governing stage[J].Turbine Technology,2013,55(5):343-346.
[3] 李慧君,赵翔.汽轮机调节级特性曲线快速算法改进[J].热力发电,2016,45(10):94-98.LI Huijun,ZHAO Xiang.Improvement on fast algorithm of steam turbine governing stage's characteristic curve[J].Thermal Power Generation,2016,45(10):94-98.
[4] 马琳,胥建群.600 MW喷嘴配汽方式汽轮机调节阀特性研究[J].汽轮机技术,2013,55(5):373-376.MA Lin,XU Jianqun.Research on valve characteristics of 600 MW nozzle governing steam turbine[J].Turbine Technology,2013,55(5):373-376.
[5] XU Jianqun,MA Lin,SUN Youyuan,et al.Research on characteristics of varying conditions for nozzle governing stage based on dimensional analysis[J].Energy,2014,65:590-595.
[6] 孙美琪.基于实际运行数据的调节级变工况特性分析[D].北京:华北电力大学,2015.
[7] 仲晓波.用于在线监测的火电机组热力系统高精度建模技术研究[D].北京:清华大学,2014.
[8] 朱泓逻.基于Ebsilon的火电厂热力系统建模、监测及优化研究[D].北京:清华大学,2015.
[9] 肖增弘,盛伟.汽轮机设备及系统[M].北京:中国电力出版社,2008.