吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (5): 1385-1391.doi: 10.7964/jdxbgxb201405026

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Improved operational pattern-PID based control of ORP in cobalt removal process using arsenic salt

WU Tie-bin1,2,YANG Chun-hua1,LI Yong-gang1,ZHU Hong-qiu1 ,GUI Wei-hua1,WANG Ya-lin1   

  1. 1.School of Information Science &Engineering, Central South University, Changsha 410083,China;
    2.Department of Electrical and Mechanical Engineering, Hu′nan Institute of Humanities Science and Technology, Loudi 417000,China
  • Received:2013-05-06 Online:2014-09-01 Published:2014-09-01

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Abstract: To solve the problem of stability control of Oxidation-Reduction Potential (ORP), which is caused by time variation, nonlinearity and time-delay in the process of cobalt removal using arsenic salt, an improved operational pattern based PID parameter tuning method is put forward. In order to improve the reliability and speed of operational pattern matching, first, an improved fuzzy C-mean clustering algorithm for operational pattern clustering is presented. Then, a two-step search method is used to match the similar operational patterns. Finally, since the system parameters of the cobalt removal process vary with time, to improve the reliability of the reused operational pattern solutions, which are PID parameters, different weighting values are assigned to the operational solutions in different times when the operational pattern is reused. A real industrial cobalt removal process control results show that the proposed method can effectively reduce the fluctuation of ORP degree and deal with complicated changing conditions.

Key words: automatic control technology, cobalt removal process using arsenic salt, oxidation-reduction potential, operational pattern

CLC Number: 

  • TP273
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