Abstract
A chemical process simulation software, AspenPlus, is applied to simulate the ammonia synthesis in the ammonia production process. A reasonable unit operating model is selected, and the RKS-BM thermodynamic method is adopted for calculations. The simulation results are in favorable agreement with the actual operation results, and the simulation data has a guiding significance on the actual production. Meanwhile, this paper analyzes the influence of the changes in the synthesis pressure, the outlet gas temperature of the synthesis tower, the hydrogen/nitrogen ratio of fresh air and other operating parameters on the ammonia synthesis section. The net profit of the synthetic section is taken as the objective function to optimize the operating parameters. The optimal process operating parameters are obtained: the synthesis pressure is 20MPa, the convertor outlet temperature is 313°C, and the H2/N2 ratio of fresh air is 3.0.
