#TITLE_ALTERNATIVE#

• Main Author: WIJI WIDODO (NIM 23005003), SURAHMAD
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/9399
• Institution: Institut Teknologi Bandung

Urea plant is a petrochemical plant considered as one of strategic industries in Indonesia. Knowledge is important asset for the company that should be managed well in order to give the optimal profit. Without the adequate knowledge to operate the process plant, the process problems tend to be solved by trial-error effort in the field with unknown result and can cause the losses for the company. With the knowledge-based system, the knowledge can be stored, organized can be accessed again to solve the process problem and minimize the trial-error losses.<p> <br /> <br /> <br /> In this thesis knowledge-based sistem formulation for process problem solving in urea synthesis process unit done by study the heuristic knowledge, study the urea synthesis equilibrium model, study the urea tray reactor with CFD simulation and study of development of process knowledge-based system model.<p> <br /> <br /> <br /> Urea reaction equilibrium model used can explain the effects of temperature, NH3/CO2 molar ratio and H2O/CO2 molar ratio to the urea conversion. Calculation results of conversion and reactor outlet composition show the agreement with the reactor data. Results of CFD simulation show that the new tray configuration gives the better mixing effect of liquid and gas phase than the conventional tray. Expert system model for process troubleshooting of urea reactor operation has been developed successfully with CLIPS expert system shell. Heuristic knowledge based on the experience and the knowledge based on process model become the knowledge base for development of knowledge-based system model for process problem solving in urea synthesis process unit.