A steel ladle bottom blowing argon system based on PLC

In order to enhance the automatic level of ladle bottom blowing argon process,a novel scheme is put forward which combines fuzzy control theory and traditional PID controller together.It uses PLC as controller and pressure,flow of blowing argon are detected to calculate control deviation.Fuzzy reasoning engine is employed to adjust PID parameters according to the control deviation and then to drive PCM device,so that the argon flow can be controlled accurately on-line.Furthermore,the scheme is able to change control strategies to adapt variant working conditions,which provides much more flexibility.The scheme has been applied in several steel factories successfully and proved meeting blowing argon technique in great range.