Particle Collection and Pressure Drop in Venturi Scrubbers

Abstract

An a priori mathematical model of venturi scrubber performance is developed and compared with experimental data on pressure drop and particle collection. It comprises simultaneous differential equations of drop motion, momentum exchange, and particle impaction on drops. These are readily integrated by computer for the whole venturi, given its configuration and operating conditions. Provided liquor distribution is reasonably uniform, pressure drop prediction is quite good for a wide variety of venturi sizes and shapes. Accuracy of prediction of particle collection is only fair. Discrepancies are thought to be due to either maldistribution of spray liquor or condensation of water vapor. Thus, provided these conditions are avoided, the model can be used to optimize design and operating conditions for specific applications.

Pressure Loss in Venturi Scrubbers

“…Correlations by Matrozov, 1 Yamauchi, et al, 2 Volgin, et al, 3 Gleason, et al, 4 10 Behie and Beeckmans 11 are theoretical correlations. All of the equations were derived from the equations of motion and momentum balance.…”

“…Geiseke's equation accounts for the mass transfer between liquid and gas. Boll's equation 10 is similar to that of Geiseke's except Boll had neglected the mass transfer between phases. Equations by Tohata, et a/., 9 Yoshida, et al, 6 ' 7 and Boll 10 contain terms attributed to wall friction.…”

“…Equations by Tohata, et a/., 9 Yoshida, et al, 6 ' 7 and Boll 10 contain terms attributed to wall friction. While Tohata, et al, 9 and Yoshida, et al, 6 ' 7 have used different values for the friction factors in the convergent, throat and divergent sections, Boll 10 suggested a single value, 0.027, for all sections.…”

Study of Venturi Scrubber Efficiency for Pesticide Industry

“…The drag coefficient, C D for droplets with Reynolds numbers, Re, from 10 to 500 can be obtained by Equation 6 [9]. The Reynolds number can be calculated using Equation 7 (where ρ G the gas density, in g/cm 3 ).…”

“…This is due to human population increasing for only a small part of recorded history, and the bulk of human-made produced air pollution is intimately related to industrialization [2]. With rapidly expanding industry, ever more urbanized lifestyles, and an increasing population, concern over the control of man-made air pollutants is now clearly a necessity [3]. In all the industry pesticides industry is one of the toxic releaser industry and also responsible for environmental pollution.…”