OPTIMIZE NITRIC ACID INJECTION PID CONTROL LOOP IN AMMONIUM NITRATE – FINAL SCRUBBER SYSTEM TO REDUCE ENVIRONMENTAL AND HUMAN RISK OF NH3 AND HNO3 FUME
Dr. Cuk Supriyadi Ali Nandar ST, M. Eng.
Dena Hendriana, B. Sc., S.M., Sc,D.
Keywords: Ammonium Nitrate, pH Control, PID, PID Tuning, Auto Tune PID, Long deadtime, Process Response Test, Siemens PCS 7
pH value in the Ammonium Nitrate (AN) manufacturing is one of the key aspects to control, since acidic condition is one of the catalysts that can lead to AN decomposition and explosion. Uncontrolled pH in AN manufacturing also can lead to various environment and human risk. This research purpose is to control pH in Ammonium Nitrate solution specifically in the Final Scrubber System using PID control to prevent risk on environment and human. Several setting using methods from Ziegler Nichols, Cohen-Coon, and Auto-Tune using Siemens PCS 7 DCS are implemented in this research. Throughout the research, it was found that the Final Scrubber System pH Control introduce a long dead time. Four from six PID setting successfully maintain the pH in the Final Scrubber System. The final PID setting that used in the system is from Cohen-Coon with PI only.