Used
primarily for particulate removal, fixed-throat venturis are recommended for exhaust
streams containing particles having a defined size distribution. The venturi throat is
then designed to provide the proper gas acceleration and liquid droplet shearing to ensure
adequate contact between the particulate and recycle liquid for impingement. The new
larger particle/droplet then is separated from the gas streams by gravitational forces and
impingement on an entrainment separator installed downstream of the venturi. Throat
pressure drop is a function of particle size. The smaller the particle to be removed, the
smaller the throat and the higher the pressure drop. Venturis are also capable of
achieving moderate gas absorption for soluble/reactive gases.
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