Journal article
An algorithm for gradient-based dynamic optimization of UV flash processes
Center for Energy Resources Engineering, Centers, Technical University of Denmark1
Scientific Computing, Department of Applied Mathematics and Computer Science, Technical University of Denmark2
Department of Applied Mathematics and Computer Science, Technical University of Denmark3
CITIES - Centre for IT-Intelligent Energy Systems, Centers, Technical University of Denmark4
This paper presents a novel single-shooting algorithm for gradient-based solution of optimal control problems with vapor-liquid equilibrium constraints. Such optimal control problems are important in several engineering applications, for instance in control of distillation columns, in certain two-phase flow problems, and in operation of oil reservoirs.
The single-shooting algorithm uses an adjoint method for the computation of gradients. Furthermore, the algorithm uses either a simultaneous or a nested approach for the numerical solution of the dynamic vapor-liquid equilibrium model equations. Two numerical examples illustrate that the simultaneous approach is faster than the nested approach and that the efficiency of the underlying thermodynamic computations is important for the overall performance of the single-shooting algorithm.
We compare the performance of different optimization software as well as the performance of different compilers in a Linux operatingsystem. These tests indicate that real-time nonlinear model predictive control of UV flash processes is computationally feasible.
Language: | English |
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Year: | 2018 |
Pages: | 281-295 |
ISSN: | 18734375 and 00981354 |
Types: | Journal article |
DOI: | 10.1016/j.compchemeng.2017.10.007 |
ORCIDs: | Ritschel, Tobias Kasper Skovborg , Gaspar, Jozsef and Jørgensen, John Bagterp |