Steady-state Simulation And Dynamic Simulation Of Stripping Urea Production Process

Urea is a very important chemical product, which is widely used in agriculture and industry. At present, most people choose stripping urea process for urea production, in which carbon dioxide stripping urea process is the most common one. Urea stripping process includes raw material pretreatment, high-pressure synthesis and recovery, middle or low pressure recovery, evaporation and granulation, and hydrolysis and absorption, among which high-pressure synthesis and recovery is the most important part.In this paper, a detailed analysis on stripping urea process has been conducted, including each equipment unit and streams. After that, urea synthesis system has been in-depth studied, including urea reaction system, reaction heat, reaction equilibrium and reaction kinetics.Based on the knowledge on stripping urea process, a steady-state process simulation was performed. With the determination of the components, appropriate thermodynamic method and equipment unit models, as well as a proper algorithm, the steady-state simulation of stripping urea process was accomplished, and the results agreed with design values. Also results by different thermodynamic method were compared.Starting from the results of steady-state simulation, dynamic process simulation of stripping urea process was conducted. After the calculation of basic physical data, the establishment of topology model and pipe network model, and the setting of initial stream information, dynamic model was successfully established. With proper algorithm, the results of dynamic process simulation was obtained, which was very close to production data. After the completion of dynamic simulation, a simulator software for stripping urea process was developed.