Exhaust gas scrubbers

As the climate warms, environmental pollution is becoming an increasingly important problem that needs to be addressed not only on the coast but also in the seas. Pollution from ships is particularly significant in coastal regions. One source of such pollution is the exhaust gases with which nitrogen is released into the atmosphere (NOx), sulfur (SOx) oxides, particulate matter, ozone depleting substances and volatile organic compounds.
Exhaust emissions from ships are the combustion of fuels in internal combustion engines, steam and thermal oil boilers, gas turbine engines and incinerators. Exhaust pipes before they are released into the atmosphere, they can be directed to the mufflers, recovery heat exchangers (economizers), purification systems (scrubbers), inert gas generation systems.
To reduce emissions to the atmosphere, it is necessary to optimize fuel combustion processes, use low-sulfur fuels or clean exhaust gases.
When considering the flue gas system, focusing on the flue gas scrubbing system, as the system will burn cheaper sulfur fuel while maintaining low / permissible coastal air pollution as environmental requirements become more stringent and the ship sails in a controlled SOx Emission Area. Basically > 97 % SOx exhaust emissions are required if 3.5% sulfur fuel is used.
Regulation 14 of Annex VI to MARPOL specifies sulfur oxide emission control areas and sets more stringent sulfur limits for marine fuels used in those areas (from the 1st January 2015 – 0.10%).
The limit value for sulfur content of marine fuels used in marine areas not covered by the Sulfur Oxide Emission Control Areas from 1st January 2020 shall be – 0.50%.
In accordance with Regulation 4 (1) of Annex VI to MARPOL, the Administration recognizes the possibility of complying with the requirements of Regulation 14 using alternative emission abatement methods. Those methods must ensure that emissions are reduced to the same or even greater extent than with low-sulfur fuels.