The key exhaust gas components that arise from the combustion process in the diesel engine are CO2, NOx, SOx and particles. For some time now, our engineers have been focusing intensively on developing technologies that significantly reduce these emissions.

Carbon dioxide (CO2) is a greenhouse gas that is among those responsible for global warming. Compared to other forms of transport and power plants, such as aircraft or coal-fired power plants, the CO2 emissions of our engines are already very low. However, MAN Diesel & Turbo is constantly working on lowering its CO2 outputs. This is mainly being achieved through an increase in the efficiency of engines, since less fuel consumption produces less CO2.

NOx is the name given to the nitric oxide compounds that arise in the engine’s combustion chamber as a result of the high combustion temperatures. Nitric oxides are contributors to acid rain and are also partly responsible for the formation of ozone near the ground. In order to lower NOx emissions, MAN Diesel & Turbo is using measures inside the engine that reduce temperature spikes during the combustion process as well as after-treatment technologies. The ability to reduce NOx emissions solely through optimised combustion in the engine, however, is limited. MAN Diesel & Turbo therefore offers its customers technically sophisticated secondary measures. Our engineers integrate these into the required engine configuration and achieve a further reduction in the NOx component of exhaust gas.

The family of sulphur oxides (SOx) is also one of the causes of acid rain. The level of SOx emissions depends solely on the quantity of sulphur present in the fuel. For this reason, SOx emissions cannot be influenced by engine-internal measures. The only option for reducing these harmful substances, therefore, is the use of aftertreatment technologies or a change to low-sulphur fuels.