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CMS can assist you with exhaust emission reduction from diesel engines affected by present or coming legislation. CMS have worked for several years with reduction of exhaust emissions by different types of measures. Mainly with SCR-systems (Selective Catalytic Reduction) for reduction of NOx (nitrogen oxides). NOx contributes to acid rain and eutrophication and to the formation of ground level ozone which is harmful to human health.
CMS  have also performed several studies into retrofitting of common-rail fuel systems on older diesel engines to improve fuel consumption and lower emissions such as CO
2 and Particulate Matter (PM). 

Based on this experience we can help you with:

  • Design and Project Management of marine SCR-systems. Supervision of installations at shipyard. Commissioning of systems after completed installations. Operation of systems during exhaust emission measurements carried out by accredited third party to receive NOx-certificates by both Swedish Maritime Administration (SMA) and Norwegian Maritime Authority (NMA).
  • Exhaust emission reduction systems. In cooperation with sub suppliers CMS can deliver complete SCR- and DPF-systems.
  • Exhaust emission measurements according to MARPOL 73/78 ANNEX VI, NOxTechnical Code guidelines. The results can be used for verification of your engines emission baseline or to verify compliance with a specified emission level prior to survey measurements by third party or authorities.
  • Pre-installation vessel evaluations before installing emission reduction systems.

CMS utilize Computational Fluid Dynamics (CFD) in our design process. Below a sootblowing example in CFD is shown in top and side view. The example shows a jetpulse of compressed air into an SCR-reactor and how it interacts with the exhaust stream. The working principle of the system is that a very large volume of high pressured air is blown over the surface that is to be cleaned. This “air pulse” momentarily raises the pressure and turbulence over the surface and “blows” the soot free. The required air volume differs between applications and must be calculated for each project.


An efficient Soot blowing system shall be capable of removing soot in the most difficult locations in the exhaust system. Both inside SCR-reactors from the catalyst surface as well as from the surfaces of any type of marine boiler. As more catalytic surface is freed in the SCR-reactor when soot is removed the risk for ammonia slip is reduced. The urea consumption can also be lowered on account of this. In the same fashion the efficiency of the boiler is also raised when soot is removed from its surface. This also reduces the risk for soot fires and possible downtime.


The simulation was done for CMS by FS Dynamics.

Every project is unique, give us a call and express your needs.

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