The so-called process control system refers to the realization of automatic control of production process of system. As stated in the introduction, in petroleum, chemical production process, generally includes the content of automatic detection, automatic protection, automatic regulation and automatic controlling. Automatic detection system can complete "understanding" production task; Signal interlocking protection system could only take safety measures when process conditions are into some kind of limit state to provent production accidents. Automatic control system can be only predefined procedures in accordance with the operation of a cyclical or regularity, only automatic adjustment system can automatically eliminate all sorts of interference factors on the influence of process parameters, that they remain in prescribed numerical to ensure production in normal or the best maintain process operation condition.%所谓过程控制系统是指对生产过程实现自动控制的系统.如绪论中所述,在石油、化工生产过程中,一般包括自动检测、自动保护、自动操纵和自动调节等方面的内容.自动检测系统只能完成"了解"生产情况的任务;信号联锁保护系统只能在工艺条件下进入某种极限状态时,采取安全措施,以免发生生产事故,自动操纵系统也只能按照预先规定好的程序进行某种周期性或规律性的操作,只有自动调节系统才能自动地排除各种干扰因素对工艺参数的影响,使它们始终保持在预先规定的数值上,以保证生产维持在正常或最佳的工艺操作状态.
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