Design specification of the motor is then determined by. Design and implementation of differential agitators to. Agitator power requirement and mixing intensity calculator. Calculations for the slurry iron ore and water mixing agitator of a pre disilication tank of pellet plant in steel industry. As per the design calculation existing agitator gb is designed for max. Agitator design mechanical motor gearbox seal shaft impeller vineet. A general result for the form of the fluid force equation. Mechanical agitator power requirements for liquid batches. Basic guidelines for design of slurry mixing agitators hi friends, the major technological facilities for alumina refinery comprises of various types of stationery and rotating process equipment like crushers, conveyors, ball mills, tanks, pumps, piping, agitators, evaporators, heat exchangers, causticizers, filters and calciners. Review on design of agitator 1akash j patil, 2sachin b rajude 3mayur s thok, 4ajit r pawar be student.
The agitating mixer has high efficiency of comparable to those produced industrially. Design of turbines 6 5 4 3 2 1 4 1 12 1 5 1 1 3 1 3 1 s d l s d j s d w s d h s d e s d d a t a t t t a. Agitation and mixing fluid mechanics mechanics scribd. The second step in the design sequence is the mechanical design of the mixer components. All software provided asis with no warranty, expressed or implied, available. Pdf design of stirrer impeller with variable operational speed for. Agitator design spreadsheet reactor vessel youtube. Characteristic of application requiring minimum fluid velocities to produce a flat but moving fluid batch surface. Beyond the process requirements, a mixer must be designed mechanically to handle hydraulic forces within material limitations. Their method has enabled the calculation of a mixing time, which is the time needed for a. Calculation of power requirement for newtonian fluid c.
Different combinations of mixer power, impeller size, rotational speed, and shaft length make the mechanical design of most mixers unique. Introduction to nonnewtonian fluid and power requirement for nonnewtonian fluids d. In static mixer systems, we have used this information to calculate a. Mixing refers to the actual stirring of different liquids andor materials to blend them together into an end product or mixture. Anchor agitators operate within close proximity to the tank wall. Agitator shaft length should be calculated on which basis. In this article, learn about all the mechanical problems that may befall your mixing equipment.
Within the two classes of impellers there exist three main types of impeller design. Designing for anomalies the first step in assessing a design is to calculate the power and torque absorbed by the proposed agitator. Table 892 geometric proportions for a standard agitation system d d a t 1 3 h d t 1 j d t 12 e d a 1 w d a 1 5 l d a 1 4 b number of blades on impeller r number of baffles d a agitator diameter h liquid height d t tank diameter e height of the agitator from the bottom of the. For our case, the density is entered, and the media is. Introduction to selection, scaleup, and design issues for solidliquid mixing equipment the mixer shaft is located off center onefourth to onehalf the tank radius, the resulting flow. Mixing is accomplished by the rotating action of an impeller in the continuous fluid. Custom engineering of impeller design can be performed based on developed horsepower, viscosity, critical speed and other key factors associated with specific processes. Mixing of fluids is necessary for many chemical processes. Compact mixer measures only 3 3 8 w x 3 1 2 h x 6 7 8 d, yet it handles as much solution as most conventional mixers up to 1. Basic guidelines for design of slurry mixing agitators.
Special properties for the customers benefit calculation, design and manufacture in compliance with pressure equipment directive 9723eg orand asme pressure vessel code, section viii, with u application industry use. Propeller turbine mixer design calculator wastewater treatment mixing equations. Longer shafts and larger impellers cause more severe loads on topentering mixers than portable mixers. Agitation is the process of keeping a mixture that has been mixed in the proper mixed state required for the end product. Use this ms excel spreadsheet to calculation the power requirements and mixing intensity for a defined mixing application. After input of design data is completed, the program provides tables for entering of average properties of media. Proper and uniform mixing gives improved quality of the product. Ss304, ss304l, ss316, ss316l, c22, cs and custom to add bottom shaft support. Several standard designs materials to match the vessel. Cerebro mix light non pressurised tank and mixer design cerebromix is used for the calculation of agitated nonpressurised process tanks.
Agitator selection and scale up agitator selection depends on the viscosity of the liquid for specific time of mixing, the best mixer is the one that mixes in the required time with the smallest. These loads are dynamic and are transmitted from the impeller blades to the mixer shaft and gear reducer. Calculates agitator speed and power requirement for a given reactor geometry and mixture properties. The design of the 6rft is standardized, the blades and the disc can be described in correlations of d, stirrer diameter and d, inside tank diameter.
Type of fluid and its physical state, the degree of agitation and geometry of vessel continue reading agitator design. Pdf geometry and architecture of mixing agitator a. Design of multiple impeller stirred tanks for the mixing of highly viscous fluids using cfd. The fundamental approach is straightforward, design for power torque and speed, then shaft loads, and finally mixer dynamics. A centrifugal agitator with a single impeller that can develop a differential pressure of more than 150 psi between the suction and the discharge is difficult and costly to design and construct. It may include mixing of liquid with liquid, gas with a liquid, or solids with liquid. Description download agitator design calculation free in pdf format. Pdf a conceptualized impeller called kia is designed for impact.
Optimal mixer design 4 factors for optimal configuration getting the right mixer for the job involves so much more than simply purchasing a standard unit offtheshelf. Mixer agitator mixtank calculators white mountain process. There is an art to configuring a mixer that will optimize the results of an application. Before we discuss design parameters, let us look briefly at. Design of multiple impeller stirred tanks for the mixing. Anchors have successfully been used to mix liquids with dynamic. Scale of agitation 1 is quite mild, 3 is normal, 6 is vigorous and 10 is violent. It includes all of the features of cerebrotank, plus the complete design of tank agitators including impeller design and stirrer motor selection. Short term training programme on process engineering. Types of agitators, agitators design and significance. Calculation of agitated liquid batch power numbers. Mind mixer mechanical design while most mixers can provide a long service life for instance, some are still operating after more than 30 years mechanical problems can shorten life or even break parts.
Agitatormixers providing tools for research and industry at a glance. In this paper, we have mainly focused on different types of agitator used in industries to increase the mixing performance. Agitator is one of the important parts in the mixing process. Design of shaft length of agitator posted in industrial professionals. I am asking this because on low level alarm 20 % of tank, agitator is not getting immersed in liquid resulting in frequent damage to bearing due to vibration so we have changed alarm value to 50% instead of 20%. Mixer is blue in color to brighten your lab, and comes with a heavyduty stand. Once this mixture is mixed it may require agitation to keep the mixture in the proper mixed state. Agitation and mixing free download as powerpoint presentation. Our core business was and is the technical design and production. If an agitator is not correctly designed for these fluids, the mixture in regions near the walls can be completely stagnant. Design calculation of theoretical torque at slurry tank agitator. Designs based on a small range of traditional agitators. It provides for the optimisation of stirrer power consumption as well as the scaleup of lab scale processes to. The cost of construction of the agitator is however minimized due to the preferred choice of the raw material and method of fabrication.
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