Design Of Advanced Process Control And Application In The Polypropylene Plant Of Dual-loop

The advanced process control is different from the conventional single loop control,and has a better control strategy than the conventional PID control.It is found that advanced control is an effective technical means for tapping potential and increasing efficiency on the basis of existing equipment and DCS control.It has the characteristics of less investment and quick effect,and is beneficial to improve the comprehensive utilization rate of resources.According to the characteristics of Qingdao petrochemical pipe polypropylene production process,the design and implementation of advanced control system adapting to the device,the design includes the main catalyst feed accurate measurement and control part of the loop tube polymerization reaction and hydrogen control optimization and quality control of melt index.It is found that the application of the main catalyst instantaneous flow equation of the catalyst amount is more accurate,and the heat of polymerization reactor accurately calculate the yield of polymerization reactor,the reaction process of the stability of the loop reactor of the two reactor advanced control put into use before and after the variance fell by about 55%.The quality controller is put into use,and the product quality stability is improved remarkably.The quality closed-loop control is realized.The variance drops about 56% before and after the application.In terms of economic efficiency,improve the target product yield per hour capacity of the unit increased by about 0.5t/h,and increase the efficiency of about 2 million 400 thousand yuan per year;unit in terms of energy consumption,energy consumption per ton polypropylene decreased about 5.5 kg of standard oil per ton polypropylene production cost about 11 yuan.After the implementation of advanced control,the device has achieved results in the grade switching and the acquisition of the experience data of the process parameters,and reduced the transition material produced during the product switching.The use of advanced control greatly reduces the labor intensity of the operator,and improves the automatic control level and overall economic benefits of the device.