Repsol uses HDS simulation to meet new EU sulfur specs

The new European Union 10-ppm sulfur fuel regulations present various challenges for operating and controlling refinery desulfurization units. Repsol-YPF, Madrid, has been using simulation to mitigate some of these challenges.In a joint project with AspenTech, Burlington, Mass., the two companies developed a rigorous steady state-dynamic model of Repsol's Puertollano refinery's hydrodesulfurization (HDS) unit. This model was further integrated with the unit multivariable predictive controller (MPC), which helped investigations of reactor conditions and operations to establish better control strategies. This article presents an account of the project and some lessons learned.New fuel specs...

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