百万千瓦机组汽动引风机的控制策略

在国内燃煤机组大型化后，为降低机组的厂用电率，首次在百万千瓦机组中将锅炉引风机与脱硫增压风机合并，采用汽轮机来驱动。随着机组运行方式的改变，汽轮机驱动引风机的运行方式、顺序控制、自动调节(静叶控制与转速控制、RB控制)等方面出现很大的变化。因此，从工程应用的角度出发，必须对传统上的相关控制策略进行修改及现场试验，在满足上述控制的前提下，保证机组的安全稳定运行。在经过反复调试、优化并投入运行后，机组实现降低厂用电率127%的良好运行效果。文章着重对控制上的难点、关键点以及出现的问题和处理方法进行总结，为其他机组的节能降耗提供参考。

Control Strategy of Induced Draft Fan Drived by Steam Turbines in 1 000 MW Unit

With the coal-fired units large-scale in China and for reducing auxiliary power rate,the draft fan and the booster fan for desulfurization are combined firstly in 1 000 MW unit and driven by the steam turbine.The operation mode,sequential control and automatic adjustment(including stationary blade control,speed control and RB control) change for the turbine-driven fan under various operation conditions of units.Therefore,from the engineering application point of view,the traditional control strategies must be modified by field tests,for achieving the above control and ensuring the safe and stable operation of the units.After repeated trials and optimizations,the auxiliary power rate is reduced 1.27%.The difficulties,key points,problems and solutions during the control are summarized,providing references for other units saving energy.