Dust Collectors

Five Principal types of industrial dust collectors are:

Inertial Separators: Intertial Separators separate dust from gas streams using a combination of forces, such as centrifugal, gravitational, and inertial.  These forces move the dust to an area where the forces exerted by the gas stream are minimal.  The separated dust is moved by gravity into a hopper, where it is temporarily stored. 

Fabric Filters: Commonly known as baghouses, fabric collectors use filtration to separate dust particulates from dusty gases.  They are one of the most efficient and cost effective types of dust collectors available and can achieve a collection efficiency of more than 99% for very fine particulates. 

Wet Scrubbers: Dust Collectors that use electrostatic forces to separate dust particles from exhaust gases.  A number of high-voltage, direct-current discharge electrodes are placed between grounded collecting electrodes.  The contaminated gases flow through the passeage formed by the discharge and collecting electrodes.  The airborne particles receive a negative charge as they pass through the ionized field between the electrodes.  These charged particles are then attracted to a grounded or positively charged electrode and adhere to it.  The collected material on the electrodes is removed by rapping or vibrating the collect electrodes either continuously or at a predetermined interval.  Cleaning a precipitator can usually by dones without interrupting the airflow. 

Electrostatic precipitators (ESP) Dust Collectors: use electrostatic forces to separate dust particles from exhaust gases.  A number of high-voltage, direct-current discharge electrodes are place between gounded cellecting electrodes.  The contaminated gases flow through the passage formed by the discharge and collecting electroddes.  The airborne particles receive a negative charge as they pass through the ionized field between the electrodes.  These charged particles are then attracted to a grounded or positively charged electrode and adhere to it.  The collected material on the electrodes is removed by rapping or vibrating the collecting electrodes either continuously or at a predetermined interval.  Cleaning a precipitator can usually be done without interrupting the airflow. 

Unit Collectors: Unlike central collectors, unit collectors control contamination at its source.  They are small and self-contained, consisting of a fan and some form of dust collector.  They are suitable for isolated, portable or frequently moved dust-producing operations, such as bins and silos or remote belt-conveyor transfer points.  Advantages of unit collectors include small space requirements, the return of collected dust to main material flow, and low initial cost.