Ships are required to reduce their nitrogen oxide emissions in certain waters. These areas are called Emission Control Areas (ECA) or NOx Emission Control Areas (NECA). The proven technology to reduce NOx emissions from marine engines is SCR (selective catalytic reduction). SCR using a urea solution as the reducing agent is consider to be a key technology for reducing NOx emission. SCR can reduce NOx emissions from ships by 99%.
In order to operate, a ship’s SCR system requires a high purity urea solution. The systems are sensitive to potential chemical impurities in the urea solution. Even small amounts of contaminant can severely impact the performance of the SCR system and can ruin the catalyst elements. The quality of the urea solution needs to be specified to ensure reliable and stable operation of the SCR system. The ISO 18611 series provide the specification of urea solution for quality, handling, transportation and storage.
Marine urea reagent is non-toxic, safe to handle, transport and store, making it practical for use in maritime vessels equipped with SCR systems.
NOxCare 40 for NOx control:
Why use NOxCare 40% urea solution for NOx reduction in marine vessels?
We do not recommend the use of AUS32.5%, which is currently used in automotive vehicles, in maritime applications. 32,5 % urea solution has a freezing point at -11 °C whilst 40% urea solution has a freezing point at 0°C. Onboard vessels, the urea solution tank is normally located below the sea surface level. Consequently, contrary to vehicles’ urea product, it will rarely or never be exposed to temperatures below 0 °C and this allows for a higher concentration of urea in the solution.
This yields better economy for the vessels because one carries less water and more urea
It is more economical
It ensures longevity of the SCR catalyst
There is a greater percentage of high purity urea - the active compound needed for chemical conversion in the SCR system