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| CHIM0695-2 | Introduction to modeling of chemical systems
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| Duration : | 20h Th, 45h Pr |
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| Number of credits : |
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| Lecturer : | Georges Heyen |
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| Substitute(s) : | Marie-Noëlle Dumont, Grégoire Léonard |
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Language(s) of instruction :
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| French language |
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Organisation and examination :
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| Teaching in the first semester, examination in June with partial in January |
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Course contents :
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| The first part of the course deals with the analysis of the energy supply and demand in a chemical process and with their representation under the form of composite curves. Then, the course evaluates the objectives and the usefulness of models through examples with a special focus on chemical processes. The difference between conceptual models and simulation models is highlighted. Different model types are identified: static/dynamic, algebraic/differential... The key elements required for the development of a simulation model are discussed: balance equations, fundamental laws, constraints and specifications, degrees of freedom. The use of models for predicting thermodynamic properties within a process is also addressed. Finally, different solving approaches for chemical processes models are presented (equations oriented and sequential modular approaches). Basic methods for numerical equation solving are also described. |
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Learning outcomes of the course :
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| The first part of this course aims at gaining skills in the analysis of the performances of a heat exchanger network as well as in the synthesis and design of such system. Students will be able to represent the thermal energy requirement of a process under the form of composite curves. On that basis, they must be able to identify the potential of energy-saving technologies like: combustion air pre-heating, oxygen-enriched combustion, limitation of the excess air, pressure change in boilers and condensers, use of heat pumps or refrigeration cycles, integration of thermodynamic cycles (cogeneration). Based on the composite curves, students must be able to design efficient heat exchanger networks (selection of heat transfer fluids and decision about the amount of heat to be transferred) that maximize the energy re-use.
In the second part of the course, students will gain theoretical and practical knowledge in order to be able to develop, calibrate and efficiently use a mathematical model of a chemical and/or thermal process. They must learn to make the difference between the design of a model and its use. The main approaches for modelling an industrial process must be clearly identified and understood. Students must gain a good command of the building steps necessary to develop a model of a physical unit operation. They will be able to implement the sequential modular approach for building a model of an industrial process based on a given flowsheet, including the identification of tear streams. From the practical works, the students will learn to use the simulation tool Aspen Plus and they will get an introduction to Hysys. They will learn the basics of selecting a relevant thermodynamic model to predict the properties of a chemical system. Finally, at the end of the course, they will have the tools available for addressing the numerical solving of industrial processes models. |
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Prerequisites and co-requisites/ Recommended optional programme components :
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| Basics of heat exchangers, fuels use, thermodynamic cycles, refrigeration. Applied chemical thermodynamics and evaluation of pure component thermodynamic properties. Linear algebra, introduction to numerical analysis and algorithmics. Basics of chemical engineering in order to build mathematical models for common devices. |
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Planned learning activities and teaching methods :
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| During the first part of the lectures, the theoretical basics of energy integration are presented and illustrated through simple examples. Students must perform an individual work: design of a heat exchanger network to maximize the energy recovery for a process with known energy demand and supply.
The second part of the lectures will give the students an insight in the basics of modelling with particular application to the modelling of industrial processes. In parallel to the lectures, 9x4h of practical classes will be held with the objectives of evidencing and teaching the use of simulation software. Commercial simulation tools are used. During the practical classes, the model of a process loop for ammonia synthesis will be developed little by little and the model will be used to perform process optimization. |
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Mode of delivery (face-to-face ; distance-learning) :
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| Course held in the fall semester. Lectures and practical classes of energy integration from week 38 to week 41, 4h/week. Week 43: Process modelling seminars (4x3h lectures, 2x4hours practical classes).
From week 44: practical classes 4h/week. |
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Recommended or required readings :
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| Reference book : J. Vidal, Thermodynamique (éditions Technip 1997)
Lecture slides and applications available on eCampus.
Simulation software available in the IT room or to install on your own computer after discussion with the supervisor. |
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Assessment methods and criteria :
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| Practical classes reports (Energy integration and process modelling).
Written examination. |
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Work placement(s) :
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Organizational remarks :
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| The first part of the course will be held by Dr. Marie-Noëlle Dumont.
The second part will be held by Dr. Grégoire Léonard. |
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Contacts :
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| 1) Dr. Grégoire Léonard (G.Leonard@ulg.ac.be)
2) Dr. Marie-Noëlle Dumont (mn.dumont@ulg.ac.be) |
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