EXPERIMENTAL INVESTIGATION OF HYDRODYNAMICS BEHAVIOR OF A SUBMERGED VENTURI SCRUBBER

摘要

An experimental study was conducted in a submerged Venturi scrubber having full-scale geometrical dimensions as the prototype reactor. The experiments were carried out at various pressure conditions, air flow rate, and submergence heights to simulate the hydrodynamics of a Venturi scrubber. Measurements of two-phase axial pressure drop in the Venturi scrubber were made across a wide range of operating all the conditions. In all conditions, the pressure drop increased with increase in flow rate in the converging section and in the throat section after the entrainment of liquid in the nozzles. However, in low pressure conditions in the diverging section was not recovered, unlike the high pressure conditions in previous measurements. The Venturi scrubber performance depends on the radial pressure difference across the nozzles located between the scrubbing pool and the throat of the Venturi, which creates liquid entrainment. The sizes and numbers of these droplets influence the scrubbing. The radial pressure difference between the Venturi throat and the scrubber tank at the nozzles across the throat was more for higher submergence height (4.5 m) as compared to lower submergence height (4 m), and it decreased with increase in gas flow rate in the Venturi scrubber. A theoretical estimation of the liquid loading to the Venturi scrubber was made from the radial pressure difference measured across nozzles. From the calculated liquid loading and the gas flow rate as input, the pressure drop across the Venturi scrubber was calculated using the models proposed by Calvert, Boll, and Hesketh. These calculated values did not correlate well with the experimental results.