The use of the mathematical programming approach for synthesis of heat exchanger networks with the objective to provide globally optimal solutions. The contribution reveals ability of the advanced systems synthesizer MIPSYN, the successor of the process synthesizer PROSYN (Kravanja and Grossmann, 1994) in solving hard combinatorial non-convex optimization problems.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 14396438This report represents the development of mathematical model for heat and energy integration of biogas processes and service facilities. The superstructural approach is applied for optimal selection of processes, and composition of input substrates. The model is formulated as a mixed-integer nonlinear problem (MINLP) for economic evaluation of optimal heat integrated process. The optimal process scheme includes the anaerobic fermentation under thermophilic conditions, poultry farm wastes, fresh water in closed water system with waste water regeneration, and production of organic fertilizer.
F.23 Development of new system-wide, normative and programme solutions, and methods
COBISS.SI-ID: 14031126This report presents the application of the mathematical modelling and optimization within the programme tool MIPSYN. That was performed for different raw material and technological alternatives of bioethanol production via the biological and thermochemical approach. Synthesis problems contain 2000 to 14000 constraints. Profitability of production is maximized including depreciation and other expenses. Heat integration is also performed.
F.23 Development of new system-wide, normative and programme solutions, and methods
COBISS.SI-ID: 14030614An overall kinetic model of sodium benzoate synthesis from ethyl benzoate and sodium hydroxide was developed in this study. A series of experiments were performed for this purpose in an automated RC1 reactor system (Mettler Toledo). Ethyl benzoate and sodium benzoate molar concentration profiles were monitored using the reaction calorimetry measurements. The proposed second order kinetic model provides a very accurate prediction of the experimental data. The obtained results were compared to previously published data1 obtained using FTIR based analysis system.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 14370838Three economic criteria were applied in the objective function when optimizing chemical processes: profit, net present value, and internal rate of return. It was shown that economic, operational, and environmental performances of optimal designs obtained are different. The main cause of the differences is the shape of the cash flow function vs investment, which is strongly dependent on the level of details incorporated in the mathematical model. Only those models with sufficient trade-offs between investment and cash flow generate proper optimal solutions with the correct economic criterion.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 14360854