Fuzzy switching control for sump level interval and hydrocyclone pressure in regrinding process

被引：0
|
作者：
Zhao, Da-Yong [1 ]
Chai, Tian-You [1 ,2 ]
机构：
[1] State Key Laboratory of Integrated Automation for Process Industry
[2] Research Center of Automation, Northeastern University
来源：
Zidonghua Xuebao/Acta Automatica Sinica | 2013年 / 39卷 / 05期
关键词：
Fuzzy control; Grinding particle size; Regrinding process; Switching control;
D O I：
10.3724/SP.J.1004.2013.00556
中图分类号：
学科分类号：
摘要：
In the mineral regrinding process of hematite beneficiation, the sump level (SL) fluctuates frequently due to some large disturbances. The pump speed inevitably changes in a wide range by adopting the existing setpoint control method for sump level, and the oscillations of hydrocyclone pressure (HP) can hardly be restricted in its desired range consequently. Hence, the classification efficiency of hydrocyclone is reduced remarkablely. In this paper, a two-layer hierarchical control structure based on fuzzy switching control method is proposed, which includes a switching controller of SL interval and a feedback controller of HP. By switching between a retainer of HP setpoint and a fuzzy compensator for HP setpoint, the controller of SL interval can guarantee the variations of HP setpoint within its desired range. In addition, the PI controller of HP can track its setpoint. Therefore, the sump level and the oscillations of HP can be limited in their target ranges respectively. The proposed method has been successfully applied to a large-scale domestic hematite beneficiation plant. The application results demonstrated that the fluctuations of SL and HP were significantly reduced. As a result, the safety operation of the regrinding process has been realized, and the improved classification efficiency of hydrocyclone has been achieved. Copyright © 2013 Acta Automatica Sinica. All rights reserved.
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页码：556 / 564
页数：8
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