WorksheetsCPE649: CONTROL DEVICES FOR PARTICULATE CONTAMINANTS
Total questions: 10
Worksheet time: 5mins
The followings are the control devices for particulate contaminants.
Settling chamber
Cyclone
Baghouse filter
Fan
Electronic precipitator
The velocity of the gas stream is reduced due to a large cross sectional area of settling chamber.
TRUE
FALSE
Choose the correct statements about cyclone.
The centrifugal force is generated by spinning of gas
Large diameter cyclone can remove particles 40 - 50 μm diameter
d50 is diameter of particle that is collected with 50% efficiency
Width of entrance, b = D/2
Which of the following is INCORRECT?
Spray tower can remove both gaseous and particulate contaminants
Wet cyclone scrubber can removes particle in size 5 to 50 micron with 90-98% efficiency
Venturi scrubber can removes submicron particles of 0.5 to 5 micron like smoke and fumes
Scrubber is not a type of wet collector
The following is INCORRECT about baghouse filter.
Particulates are collected in a hopper at the bottom
Use tubular or envelope-shaped
The top of the filter bag is sealed to prevent air exit
The bottom of the bag is opened to allow air entry
The cleaned gas is flow at the bottom
High voltage electrostatic precipitator is used at large industrial plant such as coal-fired utility boilers.
TRUE
FALSE
Large area of collection plate of electrostatic precipitator is required for a high efficiency.
FALSE
TRUE
Efficiency of a control device is depend on the particle size.
TRUE
FALSE
Choose the correct rank on the efficiency of devices to remove 1 micron particles.
cyclone > ESP > venturi scrubber > bag filter
Bag filter > venturi scrubber > spray tower > ESP
ESP > bag filter > spray tower > venturi scrubber
Bag filter > ESP > venturi scrubber > spray tower
The following are types of centrifugal collector.
Cyclone
Dynamic precipitator
Electrostatic precipitator
Scrubber
