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development of engines, which consistently meet low
emissions, is a highly specialised task and is dependent
upon understanding the effects of a broad range of mostly
localised conditions. DieselGas engineers have the skills
to design and build conversion systems to meet the most
stringent emissions specifications. As local conditions
play a part in achieving emissions goals DieselGas works
closely with clients, engine manufacturers and gas companies
to optimise emissions reduction.
CNG has the lowest greenhouse
emission potential of all fuels that are economically
comparable and readily available.
Dedicated gas engines use either stoichiometric combustion
technology or lean burn methods. Both technologies achieve
low emissions with the use of catalysts. Lean burn has
a superior fuel efficiency but can be more expensive
to implement. For engine development programmes Euro
II and Euro III can be chosen. Budget requirements increase
if Euro III emission standards are required.
With dual fuel engines DieselGas has achieved Euro II
without the use of a catalyst on 1960’s type engines.
The use of catalysts can dramatically reduce these emissions
but the diesel used must have ultra low sulphur levels
or the catalyst can become poisoned very quickly.
The Graphs below show the
results from dual fuel engine development tests on an
OM355 Daimler Benz engine. Because the diesel engine
was designed in the 1960’s the engine did not
originally meet modern emissions standards. The engine
now meets Euro II emissions standards without the use
of a catalyst. This is believed to be a world first.
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