احمد آذری

In this project, Hydrodynamic and internal flow numerical modeling of ammonia oxidation and absorption tower simulation for Karun petrochemical company (Mahshahr, Iran) have been done. Purpose of this research is to provide an interpretation to justify mal-distribution of the flow, and subsequently, to improve the process of ammonia oxidation, increase Nitrogen di-oxide absorption in the tower, and increase nitric acid production. The solver model used in the ammonia oxidation reactor modeling is 3D based on the finite volume method (FVM). Equations solving of the model have been done by applying different geometry for reactor head, different kinetics for reactions and changes the reactor geometry by using Computational Fluid Dynamics (CFD). Catalyst which used for oxidation made from Platinum, Rhodium and Palladium respectively 90, 5 and 5 percent. The reactions speed is written in programming language C and is applied to Ansys in the form of UDF . Also absorption tower simulation is done by Aspen Plus software. Investigation and Interpretation for temperature, pressure, components mole fraction, ammonia conversion percentage, nitrogen oxide and nitrogen di-oxide produce percentage curves in all moods have been done. Also results of main reactor and reactor which its geometry changed, investigated for attain to equal flow distribution in rector. In the first step, the purpose is validation of modeling results by real data for reactor and tower. The second step is investigation the results to found a manner for equal flow distribution and improve reactor efficiency. The exhibited manner for reactor head was increase length of inlet line to reactor. In the third step, in order to investigate the effect of the change in reactor on the tower’s performance, in order to simplify the simulation, assumed that, in the distance between the reactor output to the tower entrance, there is a plug reactor instead of the equipment and lines located at this interface, which after t