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This paper describes modeling and on-line optimization of a crude unit heat exchanger network at the Statoil Mongstad refinery. The objective is to minimize the energy input in the gas fired heater by optimally distributing the cold crude oil in the heat exchanger network. The steady state mass and energy balance of the 20 heat exchangers in the network(More)
The naphtha reforming process converts low-octane gasoline blending components to high-octane components for use in high-performance gasoline fuels. The reformer also has an important function as the producer of hydrogen to the refinery hydrotreaters. A process model based on a unit model structure, is used for estimation of the process condition using data(More)
This paper provides a case study on the selection of controlled variables for the implementation of real time optimization results in a crude unit heat exchanger network. Two different control strategies with 22 different control structures are evaluated. The idea is to select the controlled variables that give the best plant economic (smallest loss) when(More)
Applications for on-line data reconciliation and optimization must be efficient and numerically robust. The models in these applications are rarely changed and the same optimization problem is solved thousands of times with only minor changes in the parameters. This paper describes a suitable modeling framework for this type of applications that, with the(More)
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