Steady state and Dynamic simulation of atmospheric distillation unit of Shiraz Refinery

Atmospheric distillation unit of Shiraz Refinery has been simulated in steady state and converted to dynamic state and results are verified. To study and control a refinery unit in order to investigate in heat integration, optimization, etc., simulation is unavoidable. Steady state simulation is not useful due to ideal conditions and not inclusion of transient responses. So the unit needs to be simulated in dynamic conditions inevitably. In dynamic simulation, parameters variations and applied disturbances are controllable and getting data are closer to the actual data. So the effects of particular conditions on amount and quality of products can investigate with little cost and no need of physical available structure variation and primary design. As some assumptions in steady state simulation, e.g. the assumed but not real pressure profile in the column, the simulated results in steady state are different from dynamic simulation. Because of calculating all the profiles in the column based on the geomery, the results from dynamic simulation are more reliable and closer to real data. The simulation of our case study confirms these facts.