Equipment Size Calculation

Agitated Columns. The size of an extraction column frequently can be estimated from a knowledge of the flow rates and physical properties, combined vdth some empirical generalizations. 

The maximum capacity (at zero stirrer speed or pulsation) is directly related to the terminal velocity of the dispersed phase through the minimum physical constriction in the column. 

The terminal velocity of the dispersed phase droplets is related to the physical properties of the system by the correlation shown in Fig. 15. 

For many systems, the effect of hindered settling can be approximated by  

Agitated columns are frequently operated so that the capacity is half what it would be at no agitation (zero rpm or pulsation). Agitation is used to reduce droplet diameter to this equivalent point to increase mass transfer rate and mass transfer area. 

---

Process design calculations including process simulations Hydraulic calculations Equipment sizing calculations Equipment, instrument and motor data sheets Eist of process alarms and interlock set points. Operating manual... 

Table 3.1 summarizes the economic parameters and the basis of the equipment sizing calculations. The capital costs of individual equipment and the energy cost are estimated using the following equations ... 

For many pieces of equipment, such as heat exchangers and distillation columns, stand-alone programs are available that calculate material and energy balances around that piece of equipment, size the equipment, and calculate or rate its performance. 

Since activated carbon lies to the left of the extractant and has a lower c, it will be used to remove the remaining load (0.0003 kg toluene/s, as shown by Fig. 3.19b). The flowrate of activated carbon is 0.015 kg/s. For 8000 operating hours per year, the annual operating cost of the system is 96,700/year. The annualized fixed cost can be calculated after equipment sizing (as shown in Example 2.1). 

For a single-product plant the calculation of equipment sizes is straightforward. First the limiting cycle time ti is determined using Eqn. (7.4-14) or Gantt charts. The batch size is then evaluated for an assumed production capacity Q and available production time H ... 

The relative sizes of batch equipment are specified by means of size factors Shj for a hypothetical product. The production requirements and characteristics of each product are converted to the equivalent data for the hypothetical product and the equipment sized to achieve the required production of the hypothetical product. The method proceeds in three steps (I) calculation of exact equipment sizes for a fixed number of units of the same size mj, (2) conversion of exact equipment sizes to standard sizes, and (3) choice of mj. 

Prepare an equipment schedule detailing all major items of equipment, including tanks and pumps. A specimen pipeline sizing calculation for the reactor inlet pipe should be given. All materials of construction should be specified. 

Together we need 3 reactors for MIPS and HIPS, making a total of 7 reactors needed. An eighth will be installed as a spare. This will allow full production to continue if cleaning out the reactors becomes more of a problem than expected. Obviously a standard size reactor will be chosen it may be somewhat below the size calculated. (A similar statement can be made for each piece of equipment listed.)... 

The column vapor loads (i.e. vapor flow rates up the columns) are calculated to determine the approximate equipment sizes. An approximate method for calculating the vapor flow V in a column is (Hurme, 1996). 

Sizing calculation method, 13 248-249 Sizing/crushing equipment, artificial graphite, 12 727-729 Sizing material... 

This kind of calculation is called a rating calculation (equipment size is fixed), as opposed to a design calculation in which equipment is sized. 

Equipment Sizing Before equipment costs can be obtained, it is necessary to determine equipment size from material and energy balances. For preliminary estimates, rules of thumb may be used but for definitive and detailed estimates, detailed equipment calculations must be made. 

Key concepts of the calculation of distillation are well illustrated by analysis of the distillation of binary mixtures. Moreover, many real systems are essentially binary or can be treated as binaries made up of two pseudo components, for which it is possible to calculate upper and lower limits to the equipment size for a desired separation. 

Screw conveyors, 76,79,80 sizing calculation, 80 sizing data, 79 types of screws, 80 Screw pumps, 134, 141 performance, 148 Segmentation behavior, 305-307 equipment, 319 equipment sketches, 320,338 Segregated flow, 560 volume ratio to CSTR, 561 volume ratio to maximum mixedness, 560... 

---