This work presents
experimental studies performed on a low-pressure
auxiliary air fluid pulverization burner fueled with refined vegetable
oils to research the impact of the fatty acid profile on combustion
and regulated emissions. The vegetable oils used were coconut, palm,
rapeseed, sunflower, and soya. First, the fatty acid profile and the
degree of unsaturation of these vegetable oils were determined by
high-resolution nuclear magnetic resonance spectroscopy. The physicochemical
properties (density, kinematic viscosity, heating value, and elemental
analysis) were also determined and correlated with the degree of unsaturation.
It was found that the higher heating value of vegetable oils increases
as the degree of unsaturation also increases. In this experimental
study, the influence of varying fuel flow rate at three input air
flows on combustion efficiency and flue gas emissions was investigated.
The nitric oxide and carbon oxide emissions obtained in all the tests
performed are well below the permitted minimum levels. Combustion
efficiencies equal to or above 80% were achieved for soya, sunflower,
and rapeseed oils. A comparison between the degree of unsaturation
of the vegetable oils and some combustion parameters is also established.
In most of the experiments carried out, it was found that carbon oxide
emissions decrease and combustion efficiency increases as the degree
of unsaturation of vegetable oils increases.