Method of Lines within the Simulation Environment Diva for ChemicalProcesses

Köhler, R.; Mohl, K. D.; Schramm, H.; Zeitz, Μ.; Kienle, Achim; Mangold, Michael; Stein, Erik; Gilles, Ernst Dieter

doi:10.1201/9781420035612.ch13

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…Altogether this leads to significant savings of computational time. For example, the model has been solved with the simulator DIVA [17], where the reduced model requires only 70% of the computational time compared to the reference model. This improvement is a major advantage for extensive simulation studies and optimisations where the model has to be solved consecutively many times.…”

Section: Resultsmentioning

confidence: 99%

Physically Motivated Reduction of a 2D Dynamic Model for Molten Carbonate Fuel Cells (MCFC)

2008

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The reduction of a molten carbonate fuel cell (MCFC) model is presented. It starts from a reference model, which includes direct and indirect internal reforming as well as a catalytic combustion and a reversal chamber between anode and cathode channels. The reference model is dynamic, spatially distributed and strictly based on balances of mass, enthalpy and charges. In order to reduce the numerical effort of the model simulations and to retain as much detailed information on the system behaviour as possible, the model is systematically reduced by identifying negligible physical and chemical processes. All model reductions are discussed in detail. To evaluate the effects of the applied changes, the reduced model is compared to the reference model.

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Section: Resultsmentioning

confidence: 99%

Physically Motivated Reduction of a 2D Dynamic Model for Molten Carbonate Fuel Cells (MCFC)

2008

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“…The dynamic simulation of the SMB systems are performed using the simulation environment with DIVA [23,24]. For the periodic switching a Petri net routine is implemented.…”

Section: Mathematical Model and Optimizationmentioning

confidence: 99%

Integrated Simulated Moving Bed Processes for Production of Single Enantiomers

2011

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Based on the assumption of true moving bed processes it was demonstrated that integration of a racemization reaction into a continuous chromatographic process can improve the production of single enantiomers. In view of possible practical implementations, the analysis is extended to more realistic simulated moving bed (SMB) processes. Superstructures of SMB-based systems are defined that reflect the three general concepts of flow sheet, partial, and total process integration. Process candidates are generated by simultaneously optimizing process structure and operating conditions. Optimal process setups are determined under idealized conditions as a function of the purity requirement. The best performance is achieved by fully integrated processes. These are compared under more realistic conditions to units with side reactors. The results indicate that a simple fully integrated SMB system with three zones is a particularly promising new process option. The new concept is investigated in detail to identify relevant practical aspects.

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“…A finite volume method is used for the spatial discretization of the partial differential equations. The resulting differential algebraic system is solved by the simulation tool DIVA [15]. Typical simulation results for the temperature and current density profiles are shown in Figure 2 and Figure 3.…”

Section: Simulation Resultsmentioning

confidence: 99%

Nonlinear Model Reduction of a Two‐Dimensional MCFC Model with Internal Reforming

Mangold¹,

Sheng

2004

Fuel Cells

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A reduced nonlinear model of a planar molten carbonate fuel cell is presented. The model is derived from a spatially distributed dynamic model of the cell by applying the Karhunen Loève Galerkin procedure. The reduced model is of considerably lower order than the original one and requires much less computation time. The comparison between the two models shows that the reduced model can describe the dynamics of the temperature field with sufficient accuracy and has good extrapolation qualities with respect to changes in the model parameters.

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Method of Lines within the Simulation Environment Diva for ChemicalProcesses

Cited by 18 publications

References 23 publications

Physically Motivated Reduction of a 2D Dynamic Model for Molten Carbonate Fuel Cells (MCFC)

Physically Motivated Reduction of a 2D Dynamic Model for Molten Carbonate Fuel Cells (MCFC)

Integrated Simulated Moving Bed Processes for Production of Single Enantiomers

Nonlinear Model Reduction of a Two‐Dimensional MCFC Model with Internal Reforming

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