Page 190 - Wastewater Solids Incineration Systems

Emission Control and Monitoring 157

FIGURE 7.10 A Venturi scrubber cross-section view.

throat section. As the unit begins to converge toward the throat section, a series of pipes
tangentially supply water that floods the throat section. The flue gas is accelerated to a
high velocity through the flooded throat, which atomizes the water into fine droplets
and drives particulate matter in the liquid phase. Below the throat in the diverging sec-
tion of the Venturi, the fine, particulate laden droplets coalesce and agglomerate into
larger droplets, forming a liquid slurry that is collected at the bottom of the scrubber.
The water also continually wets the surface of the cone and thereby minimizes erosion
and corrosion of the throat section. In the throat section, either a plum bob damper or
single or double leaf dampers vary the throat opening to maintain a constant pressure
drop to compensate for changes in the exhaust gas volume.
Maintaining adequate water flows to wet all of the metallic surfaces of the throat
section is important for minimizing corrosion and erosion. Periodic inspection and