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EQE038 – Simulação e Otimização de Processos Químicos

EQE038 – Simulação e Otimização de Processos Químicos. – Aula 3 – Advanced modeling capabilities in the EMSO model editor. Argimiro R. Secchi. EQ/UFRJ 29 de agosto de 2014. Other features in the modeling language. Plug-ins – External Routines Termodynamics – VRTherm EML – Streams

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EQE038 – Simulação e Otimização de Processos Químicos

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  1. EQE038 – Simulação e Otimização de Processos Químicos – Aula 3 – Advanced modeling capabilities in the EMSO model editor. Argimiro R. Secchi EQ/UFRJ 29 de agosto de 2014

  2. Other features in the modeling language • Plug-ins – External Routines • Termodynamics – VRTherm • EML – Streams • IF-THEN-ELSE • Switching models (switcher) • FOR

  3. Using External Routines - Plugins • EMSO is a simulator based on equations and its modeling language allows to directly express the equation of the equipment. • However, there are some cases that the description directly in the form of equations is not convenient, typical examples include: • Some parameters of the model require initialization procedures (routines); • The mathematical relationships require a high number of data; • The user already has its own routine calculations; • EMSO solution: plug-in system that allows any routine written in C, C++ or FORTRAN to be used within the models. • The plug-in interface is open, anyone can implement a new plug-in.

  4. Using the Plugins To use an external procedure in the models the user needs to declare a special parameter calledPlugin: Once the Plugin has been declared, the user can call its methods using the notation: Variable = Plugin.method(args) • Before running a simulation, EMSO will check: • If all methods used in the models were properly implemented in the plugin. • If the number of arguments and the units of measure are correct.

  5. Using the Plugins • Example: • Routine calculations developed by the user: Plugin propterm.dll Rankine cycle: thermodynamic properties in FORTRAN 90

  6. Using the Plugins Applying in a thermoelectric power plant File: sample/water_steam/sample_power_plant.mso

  7. VRTherm – Methods Main Thermodynamic Models Flash Calculation Pure component Properties

  8. VRTherm – Methods Properties of mixtures

  9. Standard EML Streams The development of a basic material stream is the starting point for a library of models.In order to made compatible with each other, the models created ​​by many different people need to be directly connected.That is, it should be possible the output calculated by a model be connected to the input of another model.For this goal to be reached, all models should use standard streams, which enable integration of different models featuring a library.

  10. Using EML Streams • Inlet material streams should be of type stream • Outlet material streams should be of type: • liquid_stream: liquid phase • vapour_stream: vapor phase • streamPH: when the vaporized fraction of the stream is unknown. It made ​​a flash calculation to determine the thermodynamic state of this stream.

  11. Example – Flash Model Models/flash.mso

  12. Flash Steady – Simulation Example: run the flowsheet of the file sample_flashPH.mso. The original problem is an adiabatic flash. Consider also the results specifying the pairs (T, P) and (T, Q) instead of (P, Q). Test the problem of calculating the feed temperature or feed pressure specifying T, P and Q.

  13. Distributed Models – Heat Exchanger Models/HeatExchanger.mso A heat exchanger may be represented by a system formed by two ducts. Description of the duct

  14. Heat Exchanger – Duct Modeling

  15. Heat Exchanger Modeling Aggregation in the heat exchanger

  16. Heat Exchanger Modeling Using IF THEN ELSE END

  17. Heat Exchanger – Distributed Model

  18. Heat Exchanger – Distributed Model

  19. Heat Exchanger – Simulation Example: run the flowsheets HeatX and HeatX_Discretized in the file Sample_HeatExchanger.mso. Compare the temperature of the output stream. Export the results of the discrete to Excel or LibreOffice building the temperature profiles of the heat exchanger:

  20. Switcher – textual parameters

  21. Switcher – textual parameters Decisions independent of the user's choice

  22. Distributed Models– pipe model

  23. Distributed Models– pipe model FOR command Vectors Matrices

  24. Exercise 1) Build a model of a pressure pan with a relief valve (with constant equal to 0.07 cm2) which opens when the pressure is greater than 5 times atmospheric pressure, and closes when less than four times this pressure. Consider a 5 L pan with 20 cm in diameter containing only water with an initial level of 10 cm and a temperature of 25 °C. The heating is done at a rate of 10 kW. Simulate the pan for 10 minutes. Consider the phases in thermodynamic equilibrium model and use the Peng-Robinson model.

  25. Special thanks to Prof. Rafael de Pelegrini Soares, D.Sc. Eng. Gerson BalbuenoBicca, M.Sc. Eng. Euclides Almeida Neto, D.Sc. Eng. Eduardo Moreira de Lemos, D.Sc. Eng. Marco Antônio Müller For helping in the preparation of this material For supporting the ALSOC Project.

  26. EP 2013 ... thank you for your attention! http://www.enq.ufrgs.br/alsoc • Process Modeling, Simulation and Control Lab • Prof. ArgimiroResendeSecchi, D.Sc. • Phone: +55-21-2562-8307 • E-mail: arge@peq.coppe.ufrj.br • http://www.peq.coppe.ufrj.br/Areas/Modelagem_e_simulacao.html Solutions for Process Control and Optimization

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