Alfa Laval Inc. Scrubber Water Treatment Management PureSOx

PureNOx is a complete water treatment system using a centrifugal separator to clean the wash water in the wet scrubber PureNOx cleans the scrubber water in an Exhaust Gas Recirculation (EGR) process. EGR is one of the solutions under development for compliance with Tier III NOx reduction demands, which will apply to NOx Emission Control Areas starting in 2016. EGR has the potential to be the NOx abatement frontrunner, especially as it reduces fuel consumption when operating at Tier II. PureNOx is a complete water treatment system using a centrifugal separator to clean the wash water in the wet scrubber, which operates in a closed loop apart from the bleeding off of additional water generated in the combustion process. Developed and undergoing testing in collaboration with MAN Diesel & Turbo, PureNOx will be commercially available in due time before Tier III legislation comes into force. Cleaning of EGR scrubber water for engine protection Cleaning of discharge water in compliance with IMO directives (MEPC 57/21 Annex 4) Monitoring and logging of wash water in compliance with IMO directives Control of pH level in the EGR process Compact and simple installation as an integral part of a two-stroke diesel engine Possibility to operate at very low engine loads Reduction of maintenance costs for the EGR scrubber system Significantly reduced waste volumes for onshore disposal Equipment (delivered as a module): SWPX separators with ancillary equipment Scrubber water feed pumps NaOH dosing pumps Scrubber water collecting tank and buffer tanks Control cabinet Benefits Compared to other NOx emissions reduction systems, the EGR system offers these advantages: Compact footprint and simple installation The EGR system including Alfa Laval’s PureNOx WTS is designed as an integral part of the MAN two-stroke marine diesel engine. Easy to operate and possible to operate at very low engine loads A fully automated EGR control system ensures quick and correct response to engine load variations. Only a small amount of additives in form of NaOH is required, depending on the sulphur content in the fuel. Lower maintenance costs of EGR scrubber system Using the EGR with its integrated Alfa Laval PureNOx system is a reliable technique that effectively removes soot and thereby protects the engine. Significantly reduced waste volumes for onshore disposal PureNOx collects and discharges wash water solids as concentrated sludge into the sludge tank, while cleaning the scrubber water in compliance with IMO criteria for overboard discharge. Protection of engine and environment An Exhaust Gas Recirculation (EGR) system recirculates up to 40% of the exhaust gas into the charge air chamber. This lowers the combustion temperature, which directly reduces the formation of harmful NOx emissions. PureNOx not only prevents soot and compounds derived from the exhaust gas from accumulating in the EGR scrubber and corroding the engine, but also enables the bleed-off of clean water in compliance with IMO criteria.