API Has Launched The Marine Diesel Exhaust Fluid Certification Program
Marine DEF, or AUS 40, is an aqueous high-purity urea solution at a concentration of 40% that is needed to operate converters with SCR in applications with large combustion engines. As the name implies, Marine DEF is used in many marine applications but is increasingly used in rail and other land-based applications.
The Marine Diesel Exhaust Fluid Certification Program will certify brands of Marine DEF offered by marketers that have demonstrated that their products satisfy the requirements of the most recent and applicable edition of ISO 18611, Ships and marine technology – Marine NOx reduction agent AUS 40. Licensed marketers may use the API Marine Diesel Exhaust Fluid Certification Mark in conjunction with their licensed products and marketing materials.
The program has been integrated into the existing Diesel Exhaust Fluid Certification Program licensing portal and is designed to operate exactly as the original Diesel Exhaust Fluid Certification Program. An existing licensed marketer may easily apply for licensing of their Marine DEF products at no additional charge simply by logging in and adding the new product.
When and where
IMO NOx Tier III requirements will take effect in North American and US Caribbean ECAs from January 1st 2016 for vessels with a keel-laying date on or after January 1st 2016 and an engine output of ≥130kW.
If other ECAs for NOx are implemented, the NOx Tier III requirements will not be retroactive. That is, if new NOx ECAs take effect (e.g. for the North Sea and Baltic Sea), the Tier III emission limits become applicable to vessels with keel-laying as of the date the new NOx ECAs go into effect.
Technical solutions for low NOx emissions
To go from the current NOx Tier II limits down to the NOx Tier III limits as defined in IMO MARPOL Annex VI regulation 13, NOx emissions must be reduced by approximately 75%. This means that tuning the engine is not enough. Several technologies, or a combination of technologies, can reduce emissions to Tier III levels and technologies that don’t have NOx emission like batteries and fuel cells are not a part of the regulation. This list is a selection of the possible technologies:
- Dual fuel engines (DF)/pure gas engines
- Selective catalytic reduction (SCR)
- Exhaust gas recirculation (EGR)
- Batteries/hybrid. Also in combination with NOx reduction technologies
- Fuel cells/fuel cell hybrid systems. Also in combination with NOx reduction technologies