The combustion behaviour of six emulsions was studied in the single droplet combustion chamber. The emulsions were prepared by CSGI in Florence. The first series of tests was devoted to study the effect of ageing on the combustion behaviour. Tests were performed on fresh emulsions (within 1 month after preparation) and after 2 months ageing at 20 °C. The emulsions resulted stable with the exclusion of the sample where 15% of water was added. The second series of tests had the aim of studying the combustion properties of emulsions when compared with commercial diesel oil. Independently of emulsions composition, in terms of concentration of oil, surfactant and co-surfactant, as well as the size of the oil droplets in the emulsion, the homogeneous combustion rate resulted identical for emulsions and diesel oil. However, the combustion of emulsions droplets generates cenosphere (solid residual) and the total burning time of a droplet is given by the sum of the liquid phase (homogeneous combustion) and cenosphere (heterogeneous combustion) burning time. Thus, the attention was devoted, in the last series of experiments, to study the combustion of cenospheres. The burning rate of cenospheres from fresh and aged emulsion samples was determined.
Sixth Periodic Report, 1.1.2005 - 31.12.2005, Combustion Fundamentals of PO and PO based fuels in lab scale equipment - EU Contract ENK5-CT-2002-00690 "COMBIO: A New Competitive Liquid Biofuel for Heating"
R Calabria;F Chiariello;P Massoli
2006
Abstract
The combustion behaviour of six emulsions was studied in the single droplet combustion chamber. The emulsions were prepared by CSGI in Florence. The first series of tests was devoted to study the effect of ageing on the combustion behaviour. Tests were performed on fresh emulsions (within 1 month after preparation) and after 2 months ageing at 20 °C. The emulsions resulted stable with the exclusion of the sample where 15% of water was added. The second series of tests had the aim of studying the combustion properties of emulsions when compared with commercial diesel oil. Independently of emulsions composition, in terms of concentration of oil, surfactant and co-surfactant, as well as the size of the oil droplets in the emulsion, the homogeneous combustion rate resulted identical for emulsions and diesel oil. However, the combustion of emulsions droplets generates cenosphere (solid residual) and the total burning time of a droplet is given by the sum of the liquid phase (homogeneous combustion) and cenosphere (heterogeneous combustion) burning time. Thus, the attention was devoted, in the last series of experiments, to study the combustion of cenospheres. The burning rate of cenospheres from fresh and aged emulsion samples was determined.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
