Identification of Moisture Content in Paper Industry Using PID Auto-Tuning

K.N. Baluprithviraj; K.M. Vasanthan

doi:10.3759/joise.v3i1.3512

Abstract

The maintenance of removal of moisture content in pulp is one of the major challenges in paper manufacturing process. In some paper industries, the above process is carried out using open loop method. This method uses more labor to monitor and control the process parameters such as moisture and temperature. Also the accurate maintenance is not possible and it takes more time for tuning the process parameter. So the closed loop method has to be introduced to remove moisture content of pulp in dry end section of paper machine by maintaining the temperature at the desired set point. A set of readings are obtained for various temperature processes depending upon the flow ratios, which are used to maintain the removal of moisture in paper machine. The transfer function is derived using empirical modeling and the closed loop PID controller is tuned using Ziegler-Nichols method and Tyreus-Luyben method. The moisture content of pulp is measured using HPIR sensor which measures the moisture content in dry end section of paper machine. The PID controller is used to maintain the temperature of the dry end section based on the pulp flow. Thus the closed loop control method of removal of moisture content is achieved by the proposed process. It increases the efficiency of maintenance of removal of moisture content in dry end section of paper machine and also reduces the work load of labors and is time efficient.