Scrubbers mechanical

Mechanical Scrubbers Mechanical scrubbers comprise those devices in which a power-driven rotor produces the fine spray and the contacting of gas and liquid. As in other types of scrubbers, it is the droplets that are the principal cohectiug bodies for the dust particles. The rotor acts as a turbulence producer. An entrainment separator must be used to prevent carry-over of spray. Among potential mainte-... 

Gas cleaning may be accomplished either by mechanical methods (such as gravitational settling, centrifugal separation, filtration, ultrasonic precipitators, spray towers, mechanical scrubbers, etc) or by electrical me tbods (such as electrostatic precipitation by Cottrell Method, etc)... 

Wet Dynamic Scrubbers. These scrubbers are also known as mechanical scrubbers, as seen in Figure 20.7. They have a power-driven rotor to produce a spray that is centered in the inlet of the unit such that the blades of the rotor are coated with water. As the dust-laden stream enters, it contacts the water surfaces and the dust-water mixture is thrown outward against the walls. 

In wet mechanical scrubbers, particularly inertia is used in the separation process and, to a lesser extent diffusion processes and the condensation effect. The separating areas are formed by a water curtain, water drops, a liquid surface or the surface of bubbles. During the separation involving water drops, their mass and diameter has to be much larger than those of the particles to be separated. The efficiency of the separator is governed by relation between the velocity of the droplets of the washing medium and that of the particles in the gas to be purified, and the time of contact between the liquid and gaseous phases. 

The wet mechanical scrubbers include simple shower, vortex, foam, inertial, stream and rotational separators. 

Other types of equipment used for scrubbing include plate towers, self-induced spray scrubbers, venturi scrubbers, mechanical scrubbers, and fiber-bed scrubbers. The principle of operation of all these units is, practically, similar. Their operating principles can be consulted in reference textbooks (Green and Perry, 2008). 

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