以PLC为核心的催化剂自动加料控制系统，可以提高催化裂化装置的自动控制水平。
The PLC is the core of the catalyst automatic feed control system. It can improve the FCCU automation control level.
采取自动连续补加方式，可以使催化剂保持高性能，从而获得稳定的丙烯腈收率，实现反应器平稳优化操作。
The results showed that the catalyst maintained high characteristics, stationary acrylonitrile yield was obtained and the operation of fluidized bed reactor was optimized.
简要述说了催化剂喷雾干燥系统的工艺流程，装置改造前后对比情况，自动控制水平，以及改造后的效果。
The process of catalyst spraying dryer system are simply introduced in the paper, the comparison results, control level and effects are described as well.
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