CPE649: CONTROL DEVICES FOR GASEOUS CONTAMINANTS

The following are four treatment processes for gaseous contaminants.

• Adsorption

• Absorption

• Combustion

• Condensation

• Vaporization

What are major gaseous contaminants from industry?

• SOx

• NOx

• Hydrocarbon

• O2

• CO

What is adsorption?

• Adsorption is the adhesion of molecules of gas, liquid, or dissolved solids into liquid

• Adsorption is the collision of molecules of gas, liquid, or dissolved solids to a surface

• Adsorption is the adhesion of molecules of gas, liquid, or dissolved solids to a surface

• Adsorption is the vaporization of molecules of gas, liquid, or dissolved solids into the air

The following are examples of adsorbents.

• activated charcoal

• alumina

• silica gel

• zeolite

• ammonia

Choose three types of absorber for adsorption?

• Fixed bed

• Moving bed

• Sleeping bed

• Fluidized bed

The following are the types of absorption unit.

• Packed tower

• Plate tower

• Venturi scrubber

• Spray tower

• Cooling tower

What are the advantages of spray tower?

• High efficiency of removal for low concentration of gaseous contaminant

• Inexpensive to install and operate

• Have less gas-liquid interfacial area

• Little pressure drop

The following are the types of packing used in packed tower EXCEPT

• Pall ring

• Raschig ring

• Berl saddle

• Curl ring

Choose two types of condenser.

• Surface condenser

• Air condenser

• Contact condenser

• Spray condenser

Choose examples of combustion unit.

• Flare

• Catalytic combustion

• Thermal combustion

• Direct combustion