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Cleaner Technology Projects in Denmark 1997
Kortlægning af marinemotorers luftforurening
Arbejdsrapport nr. 61, 1997, Miljøstyrelsen
Focus on environmental consciousness has spread to the marine-sector. For several years
demands for reductions and emissions have been discussed. ISO has been working on
standards for how the emissions of motors should be measured and IMO are stating the
maximum value for the NOx-emission. This report describes the
test and emission measurements that have been made on three marine
engines.
The project was carried out by DTI Energi/Motorteknik i co-operation with MAN B & W
Diesel A/S, Alpha Diesel (MBD-F) and MAN B & W Diesel A/S, Holeby Diesel (MBD-H).
MBD-F produces propelling motors and MBD-H produces generating motors. There are
several technical differences depending on if the motors are used for propellant force or
if they are used for generating force. In the report a motor type 28/32 H is measured as a
generating motor and motors type 23/30A and type 28/32A are measured as propellant motors.
The emission measurements have been carried out on the three marine engines according
to ISO 8178.
Measurements were carried out for three different values of the inlet air temperatures
and for the inter-cooled air temperature in order to evaluate their influence on the
emission. On this basis it was possible to compare the results with the formulas for NOx
correction stated in ISO 8178. The conclusion drawn was that the influence depends on the
engine and that the formulas in ISO 8178 are insufficient to compensate for the change.
The reference-measurements show that the IMO- (International Maritime
Organisation) requirements concerning the emission of NOx is followed by the measured
motors in the standard-versions, but the requirements of EPA (Environmental Protection
Agency) about the emission of NOx cannot be kept. The EPA requirements of the CO
emissions, HC and particles are kept. The requirements to the marine-sector that can be
expected from EPA and from the EU, mean in particular a tightening of the NOx-emission.
Single measurements with changed adjustment show that the engines have potential to meet
the EPA demand for 1999-2000.
Based on the experience from this project, MAN B&W Diesel A/S, Alpha Diesel
decreased the emission from the main engine in a local ferry in the Oslofjord. The main
object was to reduce NOx emission without increasing fuel consumption. A NOx reduction of
18 % was achieved, measured and weighed with respect to the ISO 8178 loads without any
increase in fuel consumption.
Author/ institution
Flemming Bak og Michael Grouleff Jensen, DTI Energi/ Motorteknik
This report is subsidised by the National Council for Recycling and Cleaner Technology
ISSN no. 0908-9195
ISBN no. 87-7810-850-0
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