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【多选题】
3 # 在储罐 氮气压力分程控制方案中 ,下列正确的说法有 ( )。A.
调节器：具有反作用，采用 PI 控制规律；
B.
调节阀：充氮阀为气开式，排空阀为气；
C.
针对储罐顶部空隙较大 、 压力对象时间常数大 、而 氮气压力控制精度要求不高的情况， 设置 一个间歇区是允许的；
D.
设计间歇区的好处是避免两只阀的频繁开闭，以有效地节省氮气。
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