定风压系统的遇节;根据高炉工艺生产运行情况，通过临控站画面完成定风压调节手/自动操作方式的选择和所雾风压值的设定，模拟量输出模块发出4-20mA的信号控制申液伺服阀，电液伺服阀通过油压来调整风机静叶的开度（21*-79″），从而实现高炉不同的风压值，控制过程如图2所示。
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