Scrubber systems
By: Janvi Mander
Technology
Regenerative Thermal Oxidizers
Bag Filters
bio filters
SCRUBBERS
There are different types of scrubbing systems
Wet Scrubbers
Liquid is used for scrubbing
Dry Scrubbers
Either Solid sorbents or slurrys is used
Low energy scrubbers
Cyclonic Spray Scubber
Most efficient than spry towers but less efficient than venturi scrubbers
Less efficient in removing gaseous pollutants and not a tech picked for gaseous pollutant removal
Medium energy scrubbers
Orfice Scrubber
Exhaust steam is forced through
a pool of liquid at a high velocity
(15.2 m/s)
High energy scrubbers
Venturi Scrubber
Highest particle efficiency (90-99%)
among scrubbers
30-60% gas removal efficiency
Direct thermal oxidizers
there are many technologies when it comes to controlling air pollution.
What are scrubbers?
Scrubbers catch toxic gases and uses
either water or a liquid solution to neutralize the polluting compounds in the gas
other liquids like Sodium hydroxide, NaOH
are the most common liquids used for acid gases
Hydrochloric acid
(HCl)
Sulfur dioxide (SO2)
Sodium carbonate (Na2CO3)
Calcium hydroxide (CaOH2)
Scrubbers are very affective air pollution control devices for removing particles and gases from industrial exhausts
Society
16 months before the 2020 sulphur cap takes effect, the industry had to take action
the sulphur cap forced shipowners and operators to take action
almost 1300 ships have confirmed starting scrubber projects
the majority of the confirmed scrubber projects are for bulk and oil/chemical ships
open loop scrubbers are most popular
Open-loop systems use seawater, which is alkaline by nature, to wash the SOX out of the exhaust.
Chemical reactions
Chemical scrubber
Use a mixture of NaOH or CaO compounds to react with CO2 to remove the from CO2 from the air
To prevent CO2 retention and carbon dioxide poisoning from closed breathing environments.
Reation:
CO2 + Ca(OH)2 -----> CaCO3 + H2O + thermal energy (in the form of heat of the water)
Sulfur dioxide reacts with a solution of calcium carbonate in water and then gets oxidized with oxygen from our atmosphere produces Calcium sulfate, a highly stable soild
Environment
Scrubbers are very beneficial for the environment
By collecting acidic gases that can come out of power plants that gets introduced to our atmosphere and dramatically reduces it
Increaces air quality
lowers health risks for people who
could come into contact with different pollutants
There is a con
Scrubbers still create waste products from the scrubbing process both wet and dry
the only reason why dry scrubbing is more common than wet scrubbing is that they waste it produces is very less