300 MW机组过热器喷水减温控制研究与改进

某电站300 MW机组在过热器主蒸汽温度喷水减温控制中,存在喷水不均匀、现场设备故障频发和面对扰动温度失调等现象,严重影响了机组运行的可靠性和经济性。为了改善对过热器主蒸汽温度的控制调节,通过应用温差控制和自适应控制,增加抗积分饱和功能和微分前馈逻辑,以及改进现场设备等方法,使喷水减温控制取得了良好的效果。机组实际运行结果表明,优化改进达到了预期目的,从而保证了机组运行的安全高效。

Research and Improvement of Superheater Spray Desuperheating Control in 300-MW Units

During the spray desuperheating control of the main steam temperature of a 300-MW unit, uneven spraying, frequent equipment faults and control failure on temperature disturbance exist, which severely affects the reliability and economy of the unit operation. In order to improve the control level of the main steam temperature, the temperature difference control and the self-adaptation control are applied, integral saturation resistance function and derivative feedforward logic are enhanced and the field equipment is improved. The adoption of these methods results in better spray desuperheating control. The unit operation indicates that the optimization and improvement have reached the expected goal and made the whole unit safer and more efficient.