Page 348 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

316 Applied Process Design for Chemical and Petrochemical Plants

100
Equal heat transfer 0 • IMPEUER DIAMETER
per unit volume - L,..,,- I/ T•TANK DIAMETER (Co.lSTANT)
I/ v v 20 IMPELLER TYPE CONSTANT----.11�---+-�
1/
v 1,/ time-T 101--��i---�t---+.,..,....-i�- �- �-+--+-1
T• Turbulent flow
- v �qualblend
L• Laminar flow
......
......
10 - - !,, ..... 8t--��+-��-+--7''+---+--+--. ....... �+-.,,,-.�+-�+--+--t
- 61--����.....,C.-+-�+-'1""+-�-.,.c+-��-+-�+--+--t
� ./ ./ (/)
� v (/) 4t--��'4-��-4-. ....... -+---+ ........ ;.._��+-��-+-�-+--+--t
v ... Equal N r, . er equal heat 1ransfer coetficient uJ
(.)
� on i"ti•ivl 'i"['•:.::.+--+-t-tr i
� v v"" - a.
i g ...... ..... - ... - ..--- ........--r II I I I I I I I I
,,/'
.ii ,...-- / - Equal bubble and drop diameter - T
,..-Equal heat transfer coefficient - L
£ 1.0 «'. ... .u
l ' - - ...... � .. Equal mass and heat transfer coefficient: 1...._��"--��.1--......1.�1......J'-----'��--'� ....... ��
Equal blend time
L
'\. ....
l '\. "\. ....... "'- .... - � particles bubbles, drops T QI Q2 0.4 0.6 I 2 4 6 10
I
I I I
I
I
HORSEPOWER
0 I\. -- ..... ......... -,.... "1-N
.2 \ '� Solids suspension - T Figure 5-30. Effect of power on process result with constant D/T
l \ <, . "'±-. ratio. By permission, Fluid Mixing, Lightnin (formerly Mixing Equip-
[\ <, Equal tip speed·- T r--. ........ ment Co.), a unit of General Signal.
0.1
.....
Equal 11p speed - L
\. <, Oitiign test equipment to mo<al proceu
� <,
Equal NR• (land T) ....
11 I\ ......... .... � Operate equrpmanT for r&q�irod prrn:..u ruult
0.01
1 10 100 1,000
Ratio of mixed volumes, V 2 I V 1 or of impeller diameters cubed, (0 1 I 0 1) 1
Figure 5-28. Mixing scale-up factors referenced to experienced Geomeiric �imilerity for larfl(! scale equipment
ratios of power per unit volume. By permission, Penny, W. A., Chem.
Engr., Mar. 22, 1971, McGraw-Hill, Inc., p. 88 [31]. S�le ratio
Determine imp�lier drameler
Scwle-up upononr
Calcula1e agitator spee�
Compu!e ho""po,..,,
Standard sstect.nns forhor�power/speed
lmpellerl lor standard ,election

Shalt desrgn
Sear desrgn

Cost estimation

0 Q2 0.4 0.8 0.8 1.0
D/T RATIO
Design procedure for agitator scale-up Fig. 1
Figure 5-29. Effect of Off on power requirement for a given process
result. By permission, Fluid Mixing, Lightnin (formerly Mixing Equip- Figure 5-31. Design procedure for agitator scale-up. By permission,
ment Co.), a unit of General Signal. Rautzen, A. A., et al., Chem. Engr., Oct. 25, 1976, p. 119 [32].