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Edit Comment Close By: mpshah298 (42 month(s) ago) i like this presentation and it would be heldful to my graduate students. Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Comparative study of Scaba 6SRGT, Prochem Maxflo, Intermig and Rushton turbine : Comparative study of Scaba 6SRGT, Prochem Maxflo, Intermig and Rushton turbine Presented by : Megh Raj Bhatt (micromega) Slide 2: Objectives Introduction and definition Comparison Conclusion Acknowledgement References Presentation outline Slide 3: To fulfill the requirement of assignment To Define different agitators To make comparison of Scaba -6SRGT, Prochem Maxflo, Intermig and Rushton Agitators based on literature review Objectives Slide 4: Fermentation Biochemical Industrial Bioreactor A vessel in which fermentation process is carried out to produce desirable product Introduction Introduction Contd…. : Introduction Contd…. Structural components of bioreactor Agitator Glands & Bearings Baffles Sparger Introduction Contd…. : Agitator Instrument used to agitate the media Purpose of agitation Bulk fluid and gas phase mixing Air dispersion Oxygen transfer Heat transfer Suspension of solid particles Maintain uniform environment Introduction Contd…. Introduction Contd…. : Types of Agitators Disc turbine Vaned disc Open turbine (variable pitch) Marine impeller Introduction Contd…. Introduction Contd…. : Vaned disc Disc turbine(Rushton) Introduction Contd…. Introduction Contd…. : Open turbine Marine propeller Introduction Contd…. Slide 10: Agitation with vortexing Agitation without vortexing Slide 11: 1. flow pattern (bottom CD-6 - radially, and top HE-3 impeller - downwards. ) 2. flow pattern in the same vessel by means of moving filled color contours. Red - high velocity, and blue - low velocity. 3.rectangular stirred vessel equipped with two up-pumping HE-3 impellers. 4.local velocity magnitude in the same vessel by means of moving filled contours. Introduction Contd…. : Modern turbines Scaba -6SRGT Prochem maxflo Intermig (Ekato) Conventional turbine Rushton Introduction Contd…. Introduction Contd…. : Design Asymmetrical structure exists in the up and the down of the disc Blade curvature is different on top and bottom and the blade is longer on top. Scaba 6SRGT agitator Introduction Contd…. Slide 14: Deeper concave blades Sharp back edge of blade With or without disks Fine mesh is used at the impeller blades. Introduction Contd…. Scaba 6SRGT agitator Slide 15: SHPD SLRT Varieties Introduction Contd…. Scaba 6SRGT agitator Slide 16: Function (strength) All of the gas chamber behind the impeller is disappeared The decentralization capability is improved Asymmetric blade makes gas flow asymmetric Upper portion of blade capture rising gas and disperse from inside the deep blades. Flow Pattern in Vessel Introduction Contd…. Scaba 6SRGT agitator Slide 17: Function(Strength) Latest innovation in radial aflow gas dispersion Disperses more gas than all other designs. Effect of gas flow rate on power draw is reduced Can handle high flow rate before flooding in tanks ofdiameters up to 1.53m Flow Around Impeller Blades Introduction Contd…. Scaba 6SRGT agitator Slide 18: Weakness May create lower concentration of O2 in broth away from agitator. May create higher concentration of nutrients near the feed point Does not give good top to bottom blending in large fermenter Scaba 6SRGT agitator Introduction Contd…. Slide 19: Design Consists of 4 to 6 hydrofoil blades Set on a critical angle on central hollow hub High hydrodynamic thrust Increased downward pumping capacity Designed to minimize drag forces to reduce the power consumption Prochem Maxflo Introduction Contd…. Slide 20: Design Contd… Recommended agitator to vessel ratio is 0.3 to 0.4 Agitation speed of 50 to 200 rpm can be achieved Available with up to 400 hp and output speeds ranging to 480 rpm Prochem Maxflo Introduction Contd…. Slide 21: Varieties Smooth line Maxflo W Maxflo W Maxflo WSE Maxflo Y Introduction Contd…. Prochem Maxflo Slide 22: Function (Stength) Oxygen transfer efficiency is improved Suitable for bulk mixing Ideal for applications requiring high output speeds at medium torques Used at high speeds to promote rapid dispersion Used at low speeds for keeping solids in suspension. Less shear damage to the cell so can be used in animal cell culture Prochem Maxflo Introduction Contd…. Slide 23: Fluid flow pattern Prochem Maxflo Introduction Contd…. Slide 24: Weakness Flooded early Unable to give good mixing away from agitator Prochem Maxflo Introduction Contd…. Slide 25: Design Possess Two units Made originally by Ekato Germany More complex in design Generally 4 Intermig impellers used Intermig agitator Introduction Contd…. Slide 26: Design Agitator/vessel ratio ≈ 0.6 to 0.7 Impellers, commonly used in pairs, each rotated 900 on the shaft Larger air sparger is used Air dispersed from cavities on the wing Intermig agitator Introduction Contd…. Slide 27: Strength Commonly used in fermentation processes for oxygen distribution Modern device Creates strong vertical flow Power number is low Intermig agitator Introduction Contd…. Slide 28: Strength Areas of highest magnitude form a complex S-shaped region between impellers Air dispersed from cavities on the wing Holds up higher amount of air flow before flooding Intermig agitator Introduction Contd…. Slide 29: Intermig agitator Fluid flow process Introduction Contd…. Slide 30: Weakness Top to bottom mixing less efficient Vibrational problem Intemig agitator Introduction Contd…. Slide 31: Design J.H. Rushton invented an impeller he called a flat bladed turbine 3 to 6 flat blades on a disc with central shaft Sometimes curved blade 1/3 of vessel diameter Radial flow impeller Rushton turbine Introduction Contd…. Slide 32: Fluid flow pattern Rushton turbine Introduction Contd…. Slide 33: RT 3 RT 4 RT 5 RT 6 RT 12 RT 8 Types Rushton turbine Introduction Contd…. Slide 34: Variations Bar Turbine Pitched blade RT Rushton turbine Curved plate Introduction Contd…. Slide 35: Strength Most widely used Too strong cutting capablity which can make liquid and gas decentrilize behind each leaf. Suitable for gas dispersion and liquid-liquid dispersion Flow vortices are formed both below and above of the agitator results in high dispersion effect Rushton turbine Introduction Contd…. Slide 36: Strength Optimum design for many fermentation Can break up fast air stream without flooding Can withstand high superficial velocity(120m/h) Produces high degree of turbulence Simple structure for easy maintenance Rushton turbine Introduction Contd…. Slide 37: Weakness Easily flooded especially in the case of high gas load Unable to disperse gas completely Rushton turbine Introduction Contd…. Fig: a) unmixed zone b) flooding c) mechnism of flooding Slide 38: Comparison Comparison -1 Slide 39: Comparison Contd… Comparison-2 Slide 40: Comparison Contd… Comparison-3 Slide 41: Comparison Contd… Comparison-4 Slide 42: Comparison Contd… Comparison-6 Slide 43: Comparison Contd… Comparison-7 Slide 44: Comparison Contd… Comparison-8 Slide 45: Comparison Comparison-9 Conclusion : Conclusion Rushton turbine gives radial flow and highly suitable for dispersing,suitable for blending and less suitable for suspending For highly viscous fluid axial flow impeller are suited and Scaba-6SRGT, Prochem maxflo and Intermig agitator can be used Scaba-6SRGT, Prochem maxflo and Intermig agitator perform optimally with low power consumption than others Acknowledgement : Acknowledgement I wish to thank RBS sir Friends All of the faculty members Slide 48: Books • Stanbury, P.F., A. Whitaker, and S. J. Hall, Principles of Fermentation Technology, 2nd ed., Butterworth Heinemann, Oxford,2000. • Shuler, M. L. and F. Kargi. Bioprocess Engineering Basic Concepts, 2nd ed., Prentice Hall, Upper Saddle River, NJ,2002. References References : Websites http://www.clevelandmixer.com/products/impellers/default.html http://www.biotec.or.th/biotechnology-en/en/index.asp http://www.ritai-fermenter.com/products.htm http://www.mofilco.com/impeller.html http://www.academicjournals.org/AJB/manuscripts/manuscripts2003/augustmanuscripts2003/Gueguim-Kana/Gueguin-Kana%20et%20al.htm www.pressureproductsindustries.com http://www.postmixing.com/mixing%20forum/impellers/impellers.htm http://www.directindustry.com/industrial-manufacturer/mixer-68768-_121.html References Slide 50: Thanks Slide 51: Transfer of Gas from air bubble to cell Transfer of Gas from air bubble to cell You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.