Abstract:
This thesis presents the application of the plantwide control design procedure of Wongsri (2012) to the ammonia production process. Two new control structures obtained are evaluated and compared with the control structure of Skogestad (2008).The disturbances used in the evaluation are gas feed flowrate, feed temperature, and methane composition in feed changes. The new control structure, CS2, resulted in good dynamic performance for the feed flowrate and feed temperature changes. For methane composition in feed change, all control structures give comparable good performances.