MAN power and exhaust cleaning for trawlers
Three new wetfish trawlers designed by Nautic for Icelandic fishing company HB Grandi will boast MAN Diesel & Turbo main engines and selective catalytic reduction (SCR), the Danish engine designer reports.
HB Grandi’s focus on curtailing power requirements and cleaning exhaust gas was a primary reason for the selection of the MAN system, the fishing company’s CEO Vilhjalmur Vilhjalmsson said.
Special attention was given to selecting the optimal position for the SCR system. MAN noted that the “relatively straightforward integration of engine, propeller, propulsion controls and SCR system from the same manufacturer” was an added advantage.
The new trawlers’ propulsion packages offer several features to optimise operation, including a floating-frequency concept that increases their flexibility and economical part-load pattern with an up to 17% lower engine/propeller speed and a commensurately lower fuel consumption.
MAN Diesel & Turbo Alphatronic 3000 generation propulsion-control system will also be installed aboard the trawlers, featuring tailored ‘dual-propeller load curves’ for optimising towing/trawling and free-sailing conditions.
A special feature of MAN’s SCR system – which the designer claims can reduce NOx emissions by up to 90% - is communication with the engine control system to optimises the system’s temperature at individual load-points. Continuous NOx-emission control also saves urea and avoids ammonia slip.
The system will enable the trawlers’ IMO Tier II-compliant engines to fulfil strict IMO Tier III NOx emission requirements.
The vessels will be built in Turkey by Celiktrans Deniz with delivery scheduled for May 2016, late 2016 and spring 2017.
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