01

Multiplication Factor

FIG. 5.18.15 Cleaning efficiency as a function of the multiplication factor for log-normal particle distributions of various skewness.

DETERMINATION OF dac AS A FUNCTION OF SCRUBBER OPERATING PARAMETERS

A number of theoretical equations estimate scrubber performance with reasonable accuracy for a specific scrubber type.

Venturi

Calvert (1970) and Calvert et al. (1972) considered the venturi scrubber and developed the following equation for collection efficiency :

2QLuGpLdd

55Qg/g where:

Ql/Qg = the volumetric flow ratio of liquid to gas uG = the gas velocity in cm/sec fL = the density of the liquid in gm/cm3 /G = the viscosity of the liquid in poises dd = the drop diameter in cm f = an operational factor which ranges from 0.1 to 0.3, but is often taken as 0.25

The term f includes the influence of factors such as collection by means other than impaction, variation in drop sizes, loss of liquid to venturi walls, particle growth by condensation, and degree of utilization of the scrubbing liquid.

The following equation gives function F(Kpt, f):

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