Storage and Flow of Particulate Solids
Transcription
Storage and Flow of Particulate Solids
Prof. Dr.-Ing. habil. J. Tomas – chair for Mechanical Process Engineering Winter semester 2015/16 Prof. Dr.-Ing. habil. J. Tomas, 10-237, phone: 58 783, [email protected] Substituted by M.Sc. M. Trüe, 10-225, phone: 54 910, [email protected] Lecture "Storage and Flow of Particulate Solids" Lecture: Tutorial: Handouts: 0. 1. 2. 3. 3.1 3.2 3.3 3.4 3.5 4. 4.1 4.2 4.3 4.4 4.5 4.6 5. 5.1 5.2 5.3 6. 7. 8. 8.1 8.2 Fri. 15:00 - 17:00 G 14 - 125 Thu. 11:00 - 13:00 G 15 - 25 (2nd week) not in winter semester http://www.mvt.ovgu.de/mvt/en/Lectures/Lecture+SFPS.html , chapters 0 – 7: *.pdf Introduction Tasks and problems of silo or bunker plant Design steps of silo or bunker equipment Introduction into mechanics of particulate solids Particle bonds, adhesion forces and contact mechanics Biaxial stress state, flow criteria, flow properties Powder test equipment and testing techniques Flow properties of cohesive particulate solids Permeation, fluidisation and deaeration behaviour Silo and bunker design for reliable flow Hopper mass flow design to avoid bridging Hopper funnel flow design to avoid channelling Hopper discharge rates Silo filling and level control devices Hopper locks and valves Standard silos Silo and bunker pressure calculation shaft pressures hopper pressures wall thickness of concrete and metal sheet silos Design and selection of flow promotion devices Design and selection of discharge devices Introduction into dosing Volumetric dosing Gravimetric dosing Literature Schulze, D. Powders and Bulk Solids: Behaviour, Characterization and Flow McGlinchey, D. (Ed.) Bulk Solids Handling: Equipment Selection and Operation Woodcock, C.R., Mason, Bulk Solids Handling - An Introduction to J.S. the Practice and Technology Levy, A., Kalman, H. Handbook of Conveying and Handling of Particulate Solids Gotoh, K. Powder Technology Handbook Perry, R.H., Green, D.W. Perry’s Chemical Engineers’ Handbook Nedderman, R.M. Statics and Kinematics of Granular Materials Molerus, O. Principles of Flow in Disperse Systems Springer, Berlin 2008 Blackwell Publishing, Oxford 2008 Springer, New York 1987 Elsevier, Amsterdam 2001 Marcel Dekker, New York McGraw-Hill, New York Cambridge University Press Chapman & Hall, London 1997 1999 1992 1993 Folien_SFPS_0 Lecture Storage and Flow of Particulate Solids, Introduction, Jürgen Tomas 13.09.2015 Prof. Dr.-Ing. habil. J. Tomas – chair for Mechanical Process Engineering Sommer semester 2015 Prof. Dr.-Ing. habil. J. Tomas, 10-237, phone: 58783, [email protected] Lecture: "Storage and Flow of Particulate Solids" No. Family name, first name Matriculation no. e-mail 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Folien_SFPS_0 Lecture Storage and Flow of Particulate Solids, Introduction, Jürgen Tomas 13.09.2015 Prof. Dr.-Ing. habil. J. Tomas – chair for Mechanical Process Engineering 22 23 24 25 26 27 28 29 30 31 32 33 Folien_SFPS_0 Lecture Storage and Flow of Particulate Solids, Introduction, Jürgen Tomas 13.09.2015 Prof. Dr.-Ing. habil. J. Tomas – chair for Mechanical Process Engineering Recommended literature to „Storage and Flow of Particulate Solids“: Editor Title Publishers Buhrke, H., Kecke, Strömungsförderer F. Vieweg Verlag, BraunH.J., Richter, H. schweig Hampe, E. Silos, Bd I Grundlagen Verlag für Bauwesen, Berlin Hesse, St., Handhabetechnik Dr. Alfred Hüthig Verlag, Mittag, G. Heidelberg Israelachvili, J.N. Academic Press London Intermolecular and surface forces Jenike, A. W. Gravity flow of bulk solids Eng. Exp. Station Bull. No. 108, Univ. Utah Jenike, A. W. Eng. Exp. Station Bull. No. Storage and flow bulk of solids 123, Univ. Utah Johnson, K.L. Contact Mechanics Cambridge University Press Kvapil, R. Schüttgutbewegungen in Bunkern Verlag Technik, Berlin Martens, P. Ernst & Sohn, Berlin Silo – Handbuch McGlinchey, D. Bulk Solids Handling: Equipment Selection and Blackwell Publishing, Ox(Ed.) Operation ford Molerus, O. Principles of Flow in Disperse Systems Chapman & Hall, London Molerus, O. Schüttgutmechanik - Grundlagen und Anwendun- Springer Verlag, Berlin - New gen in der Verfahrenstechnik York - Tokio Pahl, M. H., Ernst, Lagern, Fördern und Dosieren von Schüttgütern Verl. TÜV Rheinland Köln / R., Wilms, H. Fachbuchverlag Leipzig Pajer, G. Fördertechnik, Bd III Stetigförderer Verlag Technik, Berlin Reimbert, A. u. M. Silos - Berechnung, Betrieb und Ausführung Bauverlag, Wiesbaden, Berlin Reisner, W., v. Ei- Silos und Bunker für die Schüttgutspeicherung Trans. Tech. Publications, senhardt-Rothe, M. Konstruktion und Verfahrensablauf Clausthal-Zellerfeld Scheffler, M. Fördermittel und ihre Anwendung für Transport, Fachbuchverlag, Leipzig Umschlag und Lagerung Schubert, H. (Ed.) Handbuch der Mechanische Verfahrenstechnik Wiley-VCH Verlag, Weinheim Schubert, H. Aufbereitung fester mineralischer Rohstoffe, Bd. Deutscher Verlag für GrundIII stoffindustrie, Leipzig Schulze, D. Powders and Bulk Solids: Behaviour, CharacSpringer Berlin terization and Flow Schwedes, J. Fließverhalten von Schüttgütern in Bunkern Verlag Chemie, Weinheim Tomas, J. Modellierung des Fließverhaltens von Schüttgütern Habilitation, Bergakademie auf der Grundlage der Wechselwirkungskräfte zwi- Freiberg schen den Partikeln und Anwendung bei der Auslegung von Bunkeranlagen Vetter, G. Handbuch Dosieren Vulkan-Verlag, Essen Woodcock, C.R., Bulk Solids Handling - An Introduction to the Springer, New York Mason, J.S. Practice and Technology Journals: Aufbereitungs-Technik Bulk Solids Handling Bulk & Powder Handl. Sci. & Technol. Chemical Engineering Science Particulate Science & Technology Powder Handling & Processing Powder Technology Folien_SFPS_0 Lecture Storage and Flow of Particulate Solids, Introduction, Jürgen Tomas 13.09.2015 Year 1989 1987 1989 1992 1961 1964 1985 1959 1988 2008 1993 1985 1993 1983 1975 1971 1980 2003 1984 2008 1970 1991 1994 1987 Prof. Dr.-Ing. habil. J. Tomas – chair for Mechanical Process Engineering Prof. Dr.-Ing. J. Tomas Storage and flow of particulate solids 3 SWS The students are introduced into the fundamentals of physical product properties of cohesive, fine to ultra-fine powders. As the consequence, they should learn how to handle cohesive powders and to prevent flow problems by an improved apparatus and plant design for reliable flow and safe structure. Practical design examples are shown with respect to the trouble-free storage, conveying, transporttation and dosing. Prerequisite: Mechanical process engineering, Mechanics Content: • • • • • • • • • • • • • • • • introduction, tasks, goals , problems processing plant, general tasks safety and environmental relevant apparatus and plant design performance, practical problems general apparatus and plant design method, engineering experiences fundamentals, flow characteristics of particulate solids as essential physical product properties Microproperties: force-displacement behaviours of elastic, elastic-plastic, viscoplastic nanoparticle contacts with load-unload hysteresis and energy dissipation adhesion forces between fine to ultra-fine particles and their testing methods particle contact consolidation microprocesses (crystallisation, chem. reactions, sintering) Macroproperties: elastic, plastic behaviours of cohesive powders, time consolidation flow parameters of cohesive powders and their testing methods powder compressibility, compression and shear work apparatus design for reliable flow and safe structure silo design feeder design design examples and their practical performance demonstration of lab-equipment to investigate powder processing and handling characteristic Folien_SFPS_0 Lecture Storage and Flow of Particulate Solids, Introduction, Jürgen Tomas 13.09.2015 Prof. Dr.-Ing. habil. J. Tomas – chair for Mechanical Process Engineering Prof. Dr. Ing.-habil. J. Tomas summer semester 2008 Topics of Oral Examination "Storage and Flow of Particulate Solids" No. Topics and content 1 Purpose and tasks of material storage units; Funnel and mass flow, advantages, disadvantages, resulting problems of silo or bunker plant; Design steps of silo or bunker equipment 2 * Particle contact mechanics, elastic, plastic, elastic-plastic and viscoplastic constititive laws of particle contact deformations (explain typical force-displacement diagrams) 3 * Adhesion forces, particle contact forces and fundamental physical material parameters or functions; kinetics of solid bridge bonds, physical material parameters 4 Stress states, powder elasticity-plastcity-viscosity, constitutive models, yield loci and flow parameters; shear force - displacement diagram, incipient consolidation, yield and steady-state flow, linear equations of yield loci, diagram sketches necessary; physicals basics of cohesion 5 Operation principles of testing equipment (shear cells …), shear testing techniques and shear cell data evaluation of yield loci, time yield loci (explain physical basics), wall friction tests 6 Powder elasticity, derivation of compression functions of particulate solids; Compression and preshear work, specific power consumption 7 Yield loci and consolidation functions for hopper design; hopper design methods for mass and funnel flow; advantages, disadvantages of conical and wedge-shaped hoppers 8 Qualitative pressure curves in shaft and hopper; derive the differential equation of silo pressures in a vertical shaft, consequences of radial stress field in a convergent hopper 9 Critical mechanical stressing of silo walls; reinforcement of concrete; buckling stresses of sheet metals and their wall thickness 10 Priciples of flow promotion devices, survey and design for flow; recommendations for application with respect to ultrafine, compressible, cohesive and impermeable powders (very problematic and poor handling), ensuring trouble-free discharge 11 Principles of discharge devices, survey and design for flow; vertical pressures in hoppers and power consumption of discharge devices; recommendations for application with respect to ultrafine, compressible, cohesive and impermeable powders (very problematic and poor handling), adaption to mass flow *not 2008 Folien_SFPS_0 Lecture Storage and Flow of Particulate Solids, Introduction, Jürgen Tomas 13.09.2015