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FLC and PLC based process optimization and control of Batch digester in pulp and paper mill

Author Affiliations

  • 1 Department of Instrumentation, Kurukshetra University, Kurukshetra, INDIA

Res. J. Engineering Sci., Volume 1, Issue (2), Pages 51-62, August,26 (2012)


Optimization and control of a batch digester operation is necessary to improve the quality of pulp produced in the pulp and paper mill. The process involves controlling all the phases of the entire cooking cycle. Pulp and paper process is nonlinear and non stationary in nature. In such type of process it is difficult to derive and identify an appropriate dynamic model for traditional controllers due to less reliability of mathematical model of the process. So instead of conventional or advanced controller which totally depends on mathematical model of process, a fuzzy logic control strategy has been proven better option for controlling such processes. This scheme of control will evaluate certainty within uncertainty and handling the parameters within range of control the entire process continuously through fluctuations occurs. In present paper, programmable logic controller (PLC) and a fuzzy logic controller (FLC) based schemes for automation and control of pulp and paper mill batch digester has been purposed and implemented which show consistent results. The system design starts from identification of inputs, outputs and choosing the membership function for each condition from normal operation up to emergency operation of pulp and paper mill batch digester. PLC provides control of pulp digesters for the process of making pulp from wood chips. PLC are used to calculate and control the amount of chips, based on density and the digester volume; determine the quantity of cooking liquors and add the required amounts in sequence. Programmable controllers also control temperature till cooking is completed. Rs logic 500 based SLC 500 processors [CPU 1747-120 C/F] produces better stabilize and optimize operation of batch digester.


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