In recent years, much attention has been focused on
the application of alternutive gaseoas fuels, particularly
natural gas (lVG), to diesel engines. This is
due to the promisiog results obtained from the resesrch
on NG as an internal combustion engine fuel
throughout the world which hus shown that there is
potential fo, minimizing air pollution and noise by
replacing diesel fuel in existing engines by lfc fuel.
For partial substitution of diesel fuel with IfG fuel
in a diesel engine, a mixed combustion process
called daal-fuelling approach has been adopted.
Dual fuelling is the method whereby an alternative
gaseous fuel such as IYG is induced into the cylinder
as a primary fuel, with oir, and is subsequently
ignited with a pilot injection of diesel fael. Extensive
tests on emissions, performonce and dilferent
umounts of NG substitution in a direct injection
(DI) diesel engine have been carried out fo, both
diesel fuel only and dual fuel (DF) operations. The
results show that 86 % NG could be substituted for diesel fuel at low speeds over the whole load range.
Maximum IfG operotion showed higher corbon
monoxide (CO) emissions than the diesel fuel only
operution while smoke was reduced with DF operation.
The maximum vulues of smoke emission were
30 Hutridge smoke numbers (HSIV) with the maximum
IfG and 28.5 HSIY in diesel fael only opeFation
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1001054 |
| Date | January 2005 |
| Creators | Mbarawa, MM, Milton, M |
| Publisher | The SA Mechanical Engineer |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | |
| Rights | The SA Mechanical Engineer |
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