Weeks 6-7 Flashcards
Wet scrubbers
Devices that collect particles by contacting gas stream with liquid drops
Electrostatic Precipitator (ESP)
Electrode
does what
Process of ionization of contaminated air with electronic wire
Some advantages of Wet Scrubbers
- can handle mists , flammable and explosive dust with little risk
- can neutralize corrosive gases and dusts
Cyclone Spray Chambers, and efficiency
Scrubbers that combine a cyclone with a spray nozzle for particle collection
efficiency of 95% for particles > 5 um
Electrostatic precipitator (ESP)
Removes particles from gas stream using electrostatic force
Effective on smaller particles (< 5 um)
List two advantages of
Electrostatic Precipitator (ESP)
-Very High Efficiencies
-it can remove dry and wet (i.e. fumes and mists) particles
List some disadvantages of
Electrostatic Precipitator (ESP)
-not flexible when installed
-might not work on particulates that have a high electrical resistivity
What do the Collection Plates for the Electrostatic Precipitator (ESP) do?
Process of particles acquiring opposite charge to collection plates
Electrostatic Precipitator (ESP) general operation
1) An electrostatic field is created wit ha high voltage of electrodes
2) the gas passes between the plates
3) partciles lose their charges when they hit the plate
Baghouse
Industrial surface filter consisting of cylindrical cloth bags
Operation of a Baghouse
-dirty gas flows from the bottom to the top in the bags
- gas then flows out through the bag, which leaves its solids behind
-clean gas flows into the outside bags
Pulse-jet baghouse
Baghouse that uses intermittent jets of compressed air to clean bags
Spray-chamber scrubbers, and their efficiency
Scrubbers that use liquid spray in a chamber to collect particles,
efficiency of 90% for particles > 8 um
