考虑冷-热端耦合因素的汽轮发电机组滑压运行综合优化

A Global Optimization Method for Turbineunits Sliding Pressure Operation Considering the Factors Coupling of Cold-hot End

当前,为了提高汽轮发电机组灵活运行时经济性,通常需要进行滑压运行控制曲线的优化。尽管汽轮机的高调阀进汽控制和运行背压是两个相对独立的过程,但两者会分别从冷、热两端影响其最优运行主汽压;尤其是在实际工程实施方面,难以实现对冷-热端耦合因素的全方位兼顾。本文在结合一台机组的实际运行情况、特点及需求的基础上,提出了一种考虑冷-热端因素耦合的汽轮发电机组滑压运行综合优化方法,依次对该机组的流量特性曲线、滑压运行控制曲线及运行背压控制曲线开展了相应的优化工作,取得了良好的实际应用效果。这对机组节能降耗的潜力得到最大程度挖掘,具有重要的工程应用价值。

Currently,in order to improve the economy of flexible operation of turbo-generator unit,it is usually necessary to optimize the control curve of sliding pressure operation.Although high profile valve inlet control and operating back pressure of steam turbine are two relatively independent processes,they will affect the optimal operating main steam pressure from the cold and hot ends respectively.Especially in the practical engineering implementation,it is difficult to realize the comprehensive consideration of cold-hot coupling factors.In this paper,based on the actual operation condition,characteristics and requirements of a unit,a comprehensive optimization method of sliding pressure operation of turbo-generator unit is proposed,which considers the coupling of cold and hot factors.The corresponding optimization work is carried out on the flow characteristic curve,sliding pressure operation control curve and running back pressure control curve of the unit in turn,and good practical application results are obtained.It has important engineering application value to tap the potential of energy saving and consumption reduction of the unit to the maximum extent.