A diesel particulate filter (DPF) can remove virtually all the soot particulates (PM) from the exhaust gas emitted from a diesel engine to ensure compliance with very strict emission standards. Regardless of the actual emission limit, diesel particulate filters satisfy the needs of operators who place importance on achieving extremely low soot emissions.
Diesel particulate filters mean less soot
The emission regulations for diesel engines are becoming increasingly stricter worldwide, which makes modifications to the drive systems necessary. As a basic principle, mtu
’s approach to achieve compliance is to reduce emission levels by means of internal engine enhancements. Depending on the specific emission limits, it may be possible to do without a diesel particulate filter altogether. However, there is a relationship between the production of soot particulates and nitrogen oxides when internal engine measures are used — if fewer soot particulates are produced during the combustion process, the quantity of nitrogen oxides increases, and vice versa. In situations where emission requirements are very strict, therefore, adding a diesel particulate filter is necessary, since it removes 90 percent or more of the soot particulates from the exhaust. For example, very stringent emission limits are due to come into force for diesel locomotives in Europe as of 2012. The EU Stage IIIB standard lowers the limit for particulate matter emissions from its current level of 0.2 g/kWh by nearly 90 percent to 0.025 g/kWh. To comply with this requirement, mtu
is equipping the new Series 4000 engine for rail applications with a particulate
filter; nitrogen oxide levels, on the other hand, are reduced from 6.0 g/kWh to 3.5 g/kWh solely by internal engine measures using mtu
’s patented donor cylinder exhaust gas recirculation system.
Due to its extremely effective cleaning effect, a particulate filter also satisfies the needs of users who — regardless of the applicable emissions standards — want to achieve the lowest possible soot emissions. Examples of this are private luxury yachts or rail applications, where particulate filters can prevent soot emissions. By using such filters, operators can demonstrate a level of social and environmental responsibility above and beyond their statutory obligations.