నైరూప్య

Production Of Ultra Low Sulfur Diesel: Simulation And Software Development

Saeid Shokri, Mahdi Ahmadi Marvast, MortezaTajerian

One of the recent challenges in the petroleum refineries is the reduction of sulfur content of gas oil to the new lower limits. The specification for the sulfur content of gas oil has been reduced from 500 ppm to 50 ppm in 2006. At present, the necessity of even deeper desulfurization is being discussed in Europe and the United States. The simulators are useful tools to manage hydrodesulfurization operation and to improve the profitability of the process. In this regard, software was developed to simulate Hydrodesulfurization process (HDS) in trickle bed reactors. The simulation was based on HYSYS environment, in which the HDS reactor model results (based on Fortran codes) were implemented in it through HYSYS Customization Capability. The multiphase reactor was simulated with a one-dimensional heterogeneous model. The reactor model was validated with the pilot data. By the use of simulation results, the effects of some pertinent operating parameters such as reactor temperature and pressure and H2/oil ratio in gas oil feed on the performance capability of the HDS plant were investigated. Based on these results the optimum operating conditions were determined .The simulation results have been used to estimate the optimum operating conditions for the HDS pilot plant to be operated in RIPI.