In most agitators, the actual relationship between torque and density is. The table for entering of viscosity is provided by the program fig. Program for design and drawing of agitator mixer gives all minor details even weight of each component and total weight at quotation stage itself and this helps to quote in most competitive manner. Try prodomixs online software for agitator design pro. Several standard designs materials to match the vessel. The first step in assessing a design is to calculate the power and torque absorbed by the proposed agitator. Review on design of agitator to optimize its performance. I need your help for estimating the power consumption of a waste recovery mixer. The joint between the front plate and mating flange is. The combination of the cfd investigations with conventional agitator software ensures maximum safety regarding the process engineering design for the agitator. Calculations for the slurry iron ore and water mixing agitator of a pre disilication tank of pellet plant in steel industry. To express and quantify the common characteristics of blending problems, terms such as size, difficulty, and dynamic response are used throughout this procedure.
Efforts have been made to confirm the accurracy of all calculations. For our case, the density is entered, and the media is defined as newtonian fig. Advanced programme pilots lack of experience is our proprietary agitator selection tool conceived to easily find out the most suitable agitator with a few tank and process data to be filled in. Generally agitator is centrally located for better flow pattern. Shaft speed scaling is done based on following relation. Although mixer design begins with a focus on process requirements, the mechanical design is essential for successful operation. It is a further advantage that the model is running using the actual dimensions and not the model dimensions. The alcohol solution, containing 30% alcohol by weight, enters the top.
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%. There is a bracket and a front plate between the motor and the welding flange. Substituting in equation 1, for the 1 mm particles, a. To find out how to calculate speed, we need the rotor diameter and rotational rate and then other curious information regarding rotor dynamics. Offered in two versions, allows the calculation of stirring and stirred systems with anchors, straight blade impellers, highefficiency turbines and.
For blending and motion problems, size is the equivalent volume, difficulty is the viscosity of the liquid, and dynamic response is the bulk fluid velocity. Download this app from microsoft store for windows 10 mobile, windows phone 8. Cerebro mix light non pressurised tank and mixer design cerebromix is used for the calculation of agitated nonpressurised process tanks. Therefore, descriptions, equations, and nomenclature will be given in both u. Calculates agitator speed and power requirement for a given reactor geometry and mixture properties. Agitatormixers providing tools for research and industry at a glance. Design calculation of theoretical torque at slurry tank agitator. Design of shaft length of agitator industrial professionals. Agitator design agitator systems stelzer ruhrtechnik. The design of agitator affects on the mixing process as proper design can increase the agitation and uniform distributions of all additives, chemicals, raw material presents in given agitator.
These relative proportions form the basis of the major correlations of agitation performance from various studies. Mixing solutions in fine chemical market field hasler group. Propeller turbine mixer design calculator calculate. Torque shaft power fluid density shaft speed2 impeller diameter5 2 pi. Alcohol is to be extracted from an aqueous solution by pure ether in an extraction column. The next step in the design series is the mechanical design of the agitator component. Agitation and mixing many operations depend upon effective agitation and mixing of components agitation. Custom engineering of impeller design can be performed based on developed horsepower, viscosity, critical speed and other key factors associated with specific processes. The viscosity of newtonian media is independent of the agitator shaft speed or shear rate.
Because the settling power and thus the agitator pow er are proportional to the hindered settling velocity, choosing the design. Vertical cylindrical vessel is the best type for installing an agitator. I offer design and drawing program which designs and draws a detailed drawing of agitator mixer, with user friendly dialog boxes, which is an addon for any cad program for designing and developing ga drawing for agitator mixer. Mixer agitator mixtank calculators white mountain process. The additional power required to circulate the liquid can be neglected for most technical applications. Basic guidelines for design of slurry mixing agitators. Relationship between torque and density in agitator. 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. In that case it could be useful trying prodomixs online software for agitator selection. We did something a little creative and unique at wnyc this past election night. Agitator is located offcenter if some part of vessel is occupied by internal coil or some other internal.
Calculation reference fundamentals of machine component design juvinall submitted by. Jan 18, 2009 design of shaft length of agitator posted in industrial professionals. How to calculate the power consumption of the agitator system given in the enclosed drawing. Design specification of the motor is then determined by. Short term training programme on process engineering. The welding flange is designed for welding into the tank. For different geometries same process results are obtained by. Design of shaft length of agitator posted in industrial professionals. Choosing the right anchor agitator for your multishaft mixer. Propeller turbine mixer design power requirement calculator turbulent flow in this calculator, the turbulent flow power requirement is calculated based on the mixing constant, fluid dynamic viscosity, revolution per second, impeller diameter.
Agitator design is often though as the application of two engineering disciplines. Chempute software nonpressurised tank and mixer design. The mixing arena is the boxing ring where chemist and chemical engineer fight in the work done. As per the design calculation existing agitator gb is designed for max.
The first step is process design from a chemical viewpoint and involves the specification of the impeller pattern, speed, temperature and blade angle etc. Our stelzer and jamix brands provide a total of 17 agitator series to choose from. The chemscale design procedure was developed to provide a logic for customers to quantify and define the agitation problem, specify required information for the design of an agitator, provide a communication tool for the customer and vendor to select a turbine agitator, and to optimize the agitator for the specific process at hand. This revealed the diversity of the vote across new york state from the cities to the suburbs, boom towns and service worker centers in real time, on the air and on the wnyc home page. Mixing can be versatile in the same tank, so mixers must be designed for many actions. To do this, it is necessary to know the local viscosity. A shaft between selfaligning bearing a and b is loaded through belt forces applied to a central sheave. We have our own experience and specific hydraulic and mechanical calculation software for the design of the agitators. However, the developer accepts no responsibility for the accuracy, use of or calculation results derived from herein. Impeller design for mixing of suspensions tomas jirout, frantisek rieger czech technical university in prague, faculty of mechanical engineering, department of process engineering, technicka 4, 166 07 prague 6, czech republic abstract this paper deals with effect of impeller type on offbottom particle suspension.
Agitator shaft length should be calculated on which basis. Agitator mixers providing tools for research and industry at a glance. To design calculations at different viscosities illustrate the typical effect of viscosity on the required agitator power. Introduction to nonnewtonian fluid and power requirement for nonnewtonian fluids d. It provides for the optimisation of stirrer power consumption as well as the scaleup of lab scale processes to.
Links for cadempvd download, help guide, sample calculation reports of pressure vessel, heat exchanger, storage tank, reactor with agitator shaft, mixing vessel, process column, chimney and more information on cadempvd and engineering services. The cerebromix program was developed using over 30 years of experience of researchers at the cerebro sa design, manufacture and deployment of agitators in brazil and throughout latin america. The following pages provide an overview of this viewpoint. Characteristic of application requiring minimum fluid velocities to produce a flat but moving fluid batch surface. This research is to design and implement a new kind of agitators called differential agitator. Note, that if the dynamic viscosity is entered, the. This means that the powertospeed ratio is typically a square function. Scale of agitation 1 is quite mild, 3 is normal, 6 is vigorous and 10 is violent. It is an outline of the chemical engineering discipline, related principles and calculation methods. Calculation for agitation scaleup and power requirement. Agitation free download as powerpoint presentation.
After input of design data is completed, the program provides tables for entering of average properties of media. Use this ms excel spreadsheet to calculation the power requirements and mixing intensity for a defined mixing application. The differential agitator is an electro mechanic set consists of two shafts. Propeller turbine mixer design calculator mixing reynolds. Designing for anomalies the first step in assessing a design is to calculate the power and torque absorbed by the proposed agitator. Agitator power requirement and mixing intensity calculator. Propeller turbine mixer design calculator wastewater treatment mixing equations. Design and implementation of differential agitators to. Impeller welded on the shaft or hub with special design pour eviter retention areas. Agitator design and agitator systems about us we have figured it out stelzer ruhrtechnik is one of the leading companies in agitation technology and a soughtafter solutions partner for projectspecific process technology solutions. Dear sir, i want to design a agitator drive with tank dia 3. In both cases a twostage ekato viscoprop agitator system with an impeller diameter d 2 1100mm serves as basis for the calculations. Ss304, ss304l, ss316, ss316l, c22, cs and custom to add bottom shaft support.
Standard design agitator lkr5 is fitted with a standard motor and the agitator shaft is directly coupled to the motor shaft. Food for thought you wanted to stir things up but, your mixing gave only agitation. Handbook of chemical engineering calculations, fourth edition. Propeller turbine mixer design calculator solving for reynolds number given impeller diameter, fluid dynamic viscosity, revolution per second and liquid mass density. There are cases where a 18 and jd wd t 110 for some agitator correlations. Basic sizing calculations are based on square batch i. Agitator design and selection standard engineers vineet. It includes all of the features of cerebrotank, plus the complete design of tank agitators including impeller design and stirrer motor selection. The blending and motion chemscale design procedure is broken down as follows. Mechanical agitator power requirements for liquid batches. Agitator components mainly include impeller, shaft, gear box and.
Thank you for clarifying the method of calculation of the power consumption of an anchor agitator. The value of n, called the scaling exponent, depends on the physical result to be scaled. The first shaft is the bearing axis while the second shaft is the axis of the quartet upper bearing impellers group and the triple lower group which are called as agitating group. A low speed anchor compliments one or two high shear devices, such as a sawtooth discstyle disperser blade or a rotorstator assembly. The chemscale design procedure emphasizes the common elements or turbine agitator design, but also does not neglect unique features of some applications. All software provided asis with no warranty, expressed or implied, available. 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.
568 530 483 1509 682 511 486 1133 1305 219 309 533 1191 1600 74 1289 360 626 997 547 381 984 456 1565 540 518 1134 1047 950 986 1024 157 1115 1318