commonly used in trucks. Since 2002, the EGR technique has been improved by introducing exhaust-gas coolers to further reduce NOx. Reductions of up to 60% have since been obtained in trucks. The EGR process used in the test
centre is based on the recirculation of exhaust gas on the engine-side of the turbocharger. Part of the exhaust gas is re-circulated from the exhaust-gas receiver to the scavenge-air system, downstream of the turbo compressor. An electrical, high-pressure blower forces
the exhaust gas through a wet scrubber (wet-gas cleaner) to the higher-pressure scavenge-air receiver. Te scrubber cleans the exhaust gas by removing SOx and particulates and also cools it through humidification before reintroduction to the combustion chamber. The resultant NOx-reducing effect is due to part replacement of the oxygen by CO2
, which
reduces the maximum peak temperatures due to deceleration of the combustion.
HOSTED BY
Mr Jensen said he was confident that
EGR was a competitive, NOx-reducing technique and that it would be used in large, two-stroke, marine diesel engines in the future. The company is now working on optimising the process in Copenhagen within the context of the “Green Ship of the Future” project and is to demonstrate it in service through a complete installation on the vessel Alexander Maersk in 2010. Another project of MAN Diesel is the
Gastech 2009 AD HALF_NA:HR 12/3/09 10:25 Page 1
development of the fuel/water emulsion system (WIF) including a re-design of the auxiliary system for increased fresh water generation, and a re-design of the fuel system. “Here we are also working with A.P. Moller-Maersk and will test the system on an existing vessel or a newbuilding,” said Mr Jensen. “The main activities related to the scavenging air moistening SAM-system are already going on as part of MAN Diesel’s own R&D activities.” NA
MAN goes marching on
MAN Diesel’s latest K80ME-C9 engine recently received type approval at licensee Hyundai Heavy Industries in South Korea. With a bore of 80cm and an increased stroke, this engine has a power density more than 20% higher per cylinder than its predecessor, the K80ME-C6. The new engine is thus comparable in power range with the existing K90ME-C6. Also unfolding is MAN Diesel’s turbocharger programme. MAN Diesel’s first VTA “Variable Turbine Area turbocharger technology” has already been installed, affixed to a slow speed, 6S46MC-C two stroke engine, one of two installed in the twin engine propulsion system of the 70,000dwt, shallow draught tanker Stena President.
25–28 May 2009 • Abu Dhabi National Exhibition Centre • UAE WHERE THE COMMERCIAL AND TECHNICAL GAS WORLDS MEET
THE LARGEST INTERNATIONAL CONFERENCE AND EXHIBITION FOR THE LNG, LPG AND NATURAL GAS INDUSTRIES IN 2009
● A must-attend conference for anyone operating in the global gas industry, with the theme ‘Gas: A time of change – a time for challenges, solutions and alternatives’
● Unrivalled networking for a global gas audience ● Latest innovations and products displayed at the Gastech exhibition
● The exhibition features 300 exhibiting companies, attracting thousands of visitors from 58 countries View the full conference programme at
www.gastech.co.uk
www.wglnetwork.com ORGANISED BY
The Naval Architect April 2009
29
Feature 1
REGISTER YOUR PLACE TODAY AT
www.gastech.co.uk/na
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