基于PLC控制的氯化钾—硫酸和氯化钾—磷酸比值控制系统分析

The potassium chloride-sulfate and potassium chloride-phosphate ratio control system based on the PLC

在自动控制系统中,经常遇到输出量是温度、压力、流量、液位、浓度、成分以及pH值等变量,这就是过程控制系统。而在过程控制系统中应用较为广泛的流量是比值控制系统。在本系统中,工艺上要求粉状的氯化钾分别与硫酸和磷酸自动地保持一定的比例关系,即分别构成氯化钾—硫酸比值控制系统和氯化钾—磷酸比值控制系统。

It is frequently encountered variables that temperatures, pressure, flow, liquid level, concentration, composition and the value of PH in the automatic control system. It is called Process Control System. Flow ratio control system is one of the widest applications in the Process Control System This paper is mainly introduced the flow ratio control system of powder of KCL which is proportional to sulfate and phosphorylation.