BlueMAX™ System Models
Depending on the application Nett's SCR system is available in the following configurations:
BlueMAX™
Nett's BlueMAX™ system is a urea-based SCR system designed to control the emissions of oxides of nitrogen (NOx) from medium and heavy-duty diesel engines in stationary, on-road and non-road applications. It offers high reductions of NOx, CO and HC emissions and up to 28% of PM emissions.
BlueMAX Plus™
Nett's BlueMAX PLUS™ system consists of the BlueMAX™ urea-based SCR system in combination with a passive diesel particulate filter. As in the standard BlueMAX™ system, the SCR targets NOx reduction, while the addition of the DPF enables high DPM reduction.
The filter utilizes cordierite or silicon carbide wall-flow monoliths to trap the soot produced by diesel engines. A proprietary catalyst is coated onto the inside surface of the filter monolith. The catalyst lowers the soot combustion temperature allowing the filter to regenerate. The accumulated soot is oxidized in the filter during regular operation of the engine. Exhaust temperatures of 275-300°C (530-575°F) for 25-30% of the operation time are necessary for proper filter regeneration, if ULSD (ultra-low sulfur diesel) fuel is used.
Passive filters are generally used on engines which run under medium to heavy load and meet the above temperature requirements.
BlueMAX Ultra™
Nett's BlueMAX ULTRA™ system consists of the BlueMAX™ urea-based SCR system in combination with Nett's Vorteq™ active diesel particulate filter.
Active systems are not sensitive to variations in exhaust gas temperature and are a practical diesel particulate control solution for all sizes of diesel engine. The system uses a diesel fuel burner to heat and oxidize the particulate matter (soot) that accumulates on a cordierite or silicon carbide particulate filter monolith. A computerized monitoring system evaluates the level of soot in the filter and alerts the machine operator when soot needs to be burned off. The regeneration occurs during periods when the engine is idling.
Active filters are generally used on engines which have a lighter duty cycle and do not meet the temperature requirements for a passive filter.