Types of scrubber
Packed Tower Scrubber
Wetted packed towers are the simplest and most commonly used approaches to gas scrubbing.
- Large contact area to remove contaminants from gas flow
- Uses loose-filled random packing
- Low running costs and capital investment
Venturi scrubbing is a most effective technique for the removal of particulates from a gas stream, even down to sub-micron size.
- Brings together scrubbing liquor and gas stream within venturi throat
- Cost effective and efficient scrubbing technique
- Can be used in combination with a chemical scrubber
Wet scrubber: parameters
The main parameters that regulate the particulate capture process are:
- Particles size: the more particle is large, the easier is his capture;
- Droplets size:capture efficiency increases with the decreasing of droplets size;
Relative velocity between the particles and the droplets: the increase of the speed increase the removal efficiency.
Types of wet scrubbers
A possible classification of the types of wet scrubbers is carried out on the basis of the phase to which energy is supplied. Particularly, energy may be supplied to:
- the gaseous phase: this is the case of Venturi scrubbers or of plate columns
the liquid phase: this is the case of spray towers
- both liquid and gaseous phases: is the case of packed or floating bed scrubbers
- The most important systems are packed columns. They consist of cylindrical chambers, that are internally filled with a packed bed structure. Equipments like this may be used also with countercurrent spray systems.
- The optimal definition of the scrubber (typology, sizing, final efficiency estimation) for the specific application is realized in an analytical way alongside our experience and the experimental tests carried out.