dc.description.abstract |
Environmental, availability and financial problems associated with fossil fuels encourage the manufacture and
use of biodiesel. In this study, vegetable oil was extracted from Jatropha curcas seeds sourced from Kenya
and Tanzania. A two-step acid–base catalytic transesterification process was used to produce biodiesel
because of the amount of free fatty acids present in the oil. The test rig used in the experiments was an Audi,
1.9-litre, turbocharged direct injection, compression ignition engine. Emissions were measured using an
Horiba emission analyser system while combustion data was collected by a data acquisition system, from
which cylinder pressure and rate of heat release of the test engine in every crank angle were calculated.
The two biodiesels showed better emission characteristics than the fossil diesel included in the tests for
comparison purposes. Cylinder pressure and heat release of the biodiesel were also within acceptable
ranges. However, the emission and combustion characteristics differed between the two biodiesels – a result
likely related to their different origins. These findings prove that the source of biodiesel is an important factor
to consider. |
en_US |