Selective catalytic reduction reduces NOx up to 97%

AUGSBURG, Germany – The International Maritime Organization (IMO) has implemented IMO Tier III emission regulations for ships constructed after January 2016. MAN Diesel & Turbo offers selective catalytic reduction (SCR) as the means to comply with the stricter NOx regulations.

SCR Technology
Catalytic after-treatment of the exhaust gas breaks down harmful NOx into harmless nitrogen and water. A reducing agent is injected into the exhaust gas flow upstream from a catalytic reactor. Together with the catalyst, this agent causes the breakdown of the NOx. With selective catalytic SCR, the engine can operate at partial and full load and maximum efficiency. With this technology a NOx reduction ratio of up to 97% is achievable. MAN Diesel offers SCR systems for both new engines and retrofit engines in the field.

Main components of the SCR system:
-- SCR reactor
-- Catalyst elements
-- Soot blowing system
-- Dosing unit
-- Mixing device
-- Urea injection lance
-- Control unit
-- Compressed air reservoir module
-- Modular selective catalytic reduction

IMO compliance
MAN provides SCR as a standard solution to meet the upcoming IMO Tier III emission limits. The technology already complies with the stricter future limits prescribed in the International Maritime Organisation’s IMO Revised MARPOL 73/78 Annex VI. Currently this means complying with IMO Tier II and IMO Tier III, second and third stages of regulations governing emissions of NOx.

Extensive range
The MAN Diesel & Turbo SCR system standard is available in 14 different sizes. In this way, it covers the entire portfolio of MAN Diesel & Turbo four-stroke, medium-speed engines. Furthermore, customized SCR systems can be offered on demand.

Modular SCR kits can be customized for both new and retrofit engines.