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Control Method and Its Application of Differential Pressure of Dryer Condensate Discharge of Paper Machine Based on Fuzzy Immune PID Algorithm
  
DOI：10.11980/j.issn.0254-508X.2018.10.010
Key Words:differential pressure of dryer condensate discharge  immune feedback mechanism  fuzzy control
Fund Project:陕西省重点科技创新团队计划项目（项目编号：2014KCT-15）；陕西省科技统筹创新工程计划项目（2016KTCQ01-35）。
Author NameAffiliation
TANG Wei1 1.College of Electrical and Information Engineering， Shaanxi University of Science & Technology， Xi′an， Shaanxi Province， 710021 
WANG Shuai1，* 1.College of Electrical and Information Engineering， Shaanxi University of Science & Technology， Xi′an， Shaanxi Province， 710021 
TONG Yong-liang1 1.College of Electrical and Information Engineering， Shaanxi University of Science & Technology， Xi′an， Shaanxi Province， 710021 
SUN Xiao-le2 2.College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi′an， Shaanxi Province， 710021 
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Abstract:Differential pressure control of dryer condensate discharge is of great significance for reducing energy consumption of the drying section and improving the quality of the paper. Aiming at drawbacks that PID control does not meet the natural law of dryer draining off water and fuzzy PID control has a certain adaptation limit， fuzzy immune PID control algorithm was applied to control differential pressure of dryer condensate discharge.Principle of fuzzy immune PID algorithm and design method of controller were introduced.Simulations were carried based on.m program in MATLAB.The simulation results showed that the control system under fuzzy immune PID algorithm had no overshoot and the adjustment time was 46.5 s.When interference was added， the overshoot was 7.46% and the fluctuation time was 30 s.When model mismatched， the overshoot was 2.8% and the adjustment time was 48 s.When model mismatched and interference added， the overshoot was 7.6% and the fluctuation time was 39 s.Application result showed that the differential pressure of dryer condensate discharge was controlled within the allowable range of the process 30～50 kPa， consumption of steam per ton of paper decreased by 9.09%， and the dryer was in a state without accumulated water．
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