燃气-蒸汽联合机组汽轮机润滑油温度控制优化

The Control Optimization of Turbine Lubricating Oil Temperature in Gas-Steam Combined Unit

在汽轮机发电机组中,润滑油温度对汽轮机系统的安全稳定运行具有重要影响。针对燃气蒸汽联合循环机组润滑油冷却系统冷却水控制品质差导致润滑油油温不稳定,降低了润滑油的油膜黏性及承载能力等问题,在对冷却系统设备进行相应改造后,利用现场试验获得冷却水系统调节阀的开度流量关系数据,采用K-means聚类算法从中筛选出表征阀门开度与流量特性的目标数据集,利用最小二乘算法对阀门流量特性进行拟合,在此基础上对润滑油温度控制策略进行优化并应用于控制系统。验证结果表明,经过阀门流量特性修正后的润滑油温控制系统,改善了温度控制品质,降低了运行人员的操作难度,有效提高了机组运行的安全性和稳定性。

In the steam turbine generator,the temperature oflubricating oil has an important influence on the safe and stable operation of steam turbine system.In order to solve the problems of unstablity of lubricating oil caused by poor cooling water control quality of lubricating oil cooling system of gas-steam combined cycle unit,which reduced the oil film viscosity and bearing capacity of lubricating oil,corresponding modification of the cooling system equipment was conducted.The field test was used to obtain the opening degree and flow rate relationship data of the regulating valve.The K-means clustering algorithm was used to excavate the target data set of the valve opening-flow characteristics.Based on this characteristic,the characteristics were fitted by the least squares algorithm.The control strategy of lubricating oil temperature was optimized and applied to the actual system.According to the verification results,the control system of lubricating oil temperature corrected by the valve flow characteristics improves the temperature control quality,reduces the operation of the operating personnel,and effectively improves the safety and stability of the unit operation.