Lecture

Mechanical Processes: Grinding Operations and Energy Consumption

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In course

CH-334: Unit operation and process technology

L'étudiant sera en mesure de : -Identifier et définir les principales opérations unitaires. -Analyser et optimiser une opération unitaire selon les contraintes. - Proposer des améliorations techniques, économiques et durables. ...

Description

This lecture covers the mechanical processes involved in grinding operations, focusing on the types of grinders based on material hardness and product size. It discusses energy consumption, heat production, and the inefficiencies leading to low energy yields during fragmentation operations.

Instructor

Thierry Meyer

Thierry Meyer received in 1986 a diploma degree (MSc) in chemical engineering from the Swiss Federal Institute of Technology at Lausanne (EPFL). He was awarded in 1989 a PhD at EPFL for his thesis on micromixing in highly viscous polymeric media. He joined the Institute of Chemical Engineering from 1989 till 1993 as senior scientist in the field of polymerization reactions. In 1994 he joined Ciba-Geigy SA in the pigment division as successively development chemist, head of development a.i. and finally production manager for high performance pigments. Returning to the Institute of Chemical Engineering at EPFL in Lausanne by the end of 1998, he was nominated maître denseignement et de recherche (MER) for leading a new research group in the field of polymers and supercritical fluids, and teaching to chemists, chemical engineers and material sciences, disciplines as process development, introduction to chemical engineering, polymer and organic chemistry at master and bachelor program. In 2005 he owned the responsibility of the Occupational Health and Safety of the school of basic sciences on top of his research activities dealing with risk management and supercritical fluids. He is presently teaching introduction to chemical engineering at bachelor level, risk management at master level and specific courses on safety and engineering risk management in continuing education. He acts also as consultant and expert in risk assessment and chemical engineering matters by the ICC (International Chamber of Commerce) of the World Business Organization, by several consultancy companies and by major and SMEs chemical industries. Thierry Meyer is currently member of several international associations of the European Federation of Chemical Engineering, American institution of chemical engineering, American chemical society and senior member of the American Institute of Chemical Engineers. He was elected chairman of the European Working Party on Polymer Reaction Engineering from 2001 till 2006. He his currently the Swiss academic member of the European Working Party on Loss Prevention and Safety Promotion as well as of the European Working Party on Education. He is member of several editorial boards: Chemical Engineering Research and Design, Macromolecular Reaction Engineering, Chemical Engineering and Technology, Journal of Chemical Health and Safety.

Official source

Related concepts (32)

Liquid

A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a nearly constant volume independent of pressure. It is one of the four fundamental states of matter (the others being solid, gas, and plasma), and is the only state with a definite volume but no fixed shape. The density of a liquid is usually close to that of a solid, and much higher than that of a gas. Therefore, liquid and solid are both termed condensed matter.

Fluid dynamics

In physics, physical chemistry and engineering, fluid dynamics is a subdiscipline of fluid mechanics that describes the flow of fluids—liquids and gases. It has several subdisciplines, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moments on aircraft, determining the mass flow rate of petroleum through pipelines, predicting weather patterns, understanding nebulae in interstellar space and modelling fission weapon detonation.

Mixture

In chemistry, a mixture is a material made up of two or more different chemical substances which are not chemically bonded. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids. Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup.

Heat pump

A heat pump is a device that uses work to transfer heat from a cool space to a warm space by transferring thermal energy using a refrigeration cycle, cooling the cool space and warming the warm space. In cold weather a heat pump can move heat from the cool outdoors to warm a house; the pump may also be designed to move heat from the house to the warmer outdoors in warm weather. As they transfer heat rather than generating heat, they are more energy-efficient than other ways of heating a home.

Heat

In thermodynamics, heat is the thermal energy transferred between systems due to a temperature difference. In colloquial use, heat sometimes refers to thermal energy itself. An example of formal vs. informal usage may be obtained from the right-hand photo, in which the metal bar is "conducting heat" from its hot end to its cold end, but if the metal bar is considered a thermodynamic system, then the energy flowing within the metal bar is called internal energy, not heat.

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