Agitated vessel design(basic)

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Information about Agitated vessel design(basic)

Published on March 16, 2014

Author: dipakbabu


Agitated vessels:  Agitated vessels Dipak gangapatnam 13042016 M tech part 1 IIT(BHU) Varanasi seminar Mixing Agitation: Mixing Agitation Basic definitions : Basic definitions Agitation : Induced motion of a material in a specified way ,usually in a circulatory pattern inside some sort of a container. Mixing : Random distribution into and through one another ,of two or more initially separate phases . A simple example:  A simple example Gas A Gas B blending Sample A Sample B Same composition = Agitation Rotating drum: Rotating drum Different compositions = Mixing Where is it used….??: B lending of two miscible liquids ( ethyl alcohol and water ). D issolving solids in liquid ( salt in water ). liquid-liquid dispersion (dispersion of pigment in solvents ). S uspending of fine solid particles in a liquid ( catalytic hydrogenation of a liquid). A gitation of the fluid to increase heat transfer between the fluid and a coil or jacket in the vessel wall. dispersing a gas in a liquid as fine bubbles, such as oxygen from air in a suspension of microorganisms for fermentation or for the activated sludge process in waste treatment. Where is it used….?? The basic design : The basic design Influencing factors for achieving a needed amount of mixture or quality of mixing : 1) Dimensions of the liquid content of the vessel. 2) Dimensions and arrangement of the impellers , baffles . Design factors : The vessel shape . The type , size , position and speed of the impeller. Flow patterns. Vortex formation. Baffles. Power correlations. Design factors The vessel : The vessel Rounded to eliminate sharp corners or regions into which fluid currents would not penetrate . Height of fluid = diameter of the vessel “The impeller”: “The impeller” Types …..!!!: Types …..!!! PowerPoint Presentation:     Vessel illuminated with a number of thin light sheets with different colors. PowerPoint Presentation: Pitched blade turbine Three blade marine propeller Straight blade turbine Concave blade impeller Disc turbine PowerPoint Presentation: Image source : Double flight helical ribbon impeller PowerPoint Presentation: Impeller location : 1/6 the liquid level from the bottom Impeller speed : standard speeds are 37, 45, 56, 68, 84, 100, 125, 155, 190, and 320rpm. Power requirements usually are not great enough to justify the use of continuously adjustable steam turbine drives. Impeller size : the ratio of diameters of impeller and vessel falls in the range, d/D,= 0.3-0.6 . Another rule is that a second impeller is needed when the liquid must travel more than 4 ft before deflection. Flow patterns : Depend upon : The type of the impeller The characteristics of the liquid(especially viscosity ) The size and proportions of : 1) tanks 2) baffles 3) impeller Flow patterns PowerPoint Presentation: V r V t V l PowerPoint Presentation: Vortex elimination: Vortex elimination Small tank : Small tank PowerPoint Presentation: Angle with the radius “Baffles”: “Baffles” Power consumption : Power consumption Pumping number Power number Reynolds number Power correlations A simple numerical : A simple numerical For a vessel containing 5000 gal of liquid with specific gravity = 0.9 and viscosity of lOOcP , find size and speed of a pitched turbine impeller to deliver 2 hp/1000 gal . Check also the superficial linear velocity Solution : Size : d = 0.40 = 0.4(9.5)(12) = 45.6 in , say 46 in . P= 2V = 2(5) = lO hp. (1 hp = 0.74 kW) = 7.4 kW . PowerPoint Presentation: Standard speeds Developed formulae Above 1000 Formulae source : Chemical processes equipment James R. Couper , W. Roy Penney, James R. Fair and Stanley M. Walas PowerPoint Presentation: 1.3 PowerPoint Presentation: N = 84 Rotations per minute PowerPoint Presentation: I fps = .308 m/sec So 0.68 fps = 0.207 m/sec 1 cubic foot per second = 0.0283168466 cubic meters / second 48.1 cfs = 1.362 cubic meters / second New developments : New developments PowerPoint Presentation: Input parameters PowerPoint Presentation: identical identical Conclusion : The performance of a particular agitator usually cannot be predicted quantitatively. Agitator design is largely in exercise of judgment so a considerable variety has been put forth by various manufacturers. Developing software . Conclusion Bibliography : Unit Operations of Chemical Engineering (7th edition)(McGraw Hill Chemical Engineering Series) Warren McCabe    Julian Smith    Peter Harriott Chemical processes equipment James R. Couper , W. Roy Penney, James R. Fair and Stanley M. Walas Bibliography

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