Single Droplet Combustion of Emulsified Hydrocarbon Fuels (II):Comparson of O/W and W/O Emulsions in Combustion Characteristics

概要

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High pressure thermal analysis, microscope observation of emulsion transformation and phase transition during heating, and single droplet burning experiment have been carried out, in order to obtain essential data to compare the applicability of oil-in-water (O/W) with that of water-in-oil (W/O) emulsified kerosene and fuel oil, particularly focussing on the action of the secondary micro-atomization. Non-ionic surface active agents were used to produce stable emulsified fuels. It is shown that W/O emulsified A and B fuel oils promise superior combustion characteristics to 0/W emulsified ones, because the earlier occurrence and longer duration of intense micro-atomization make the total burning life substantially shorter. With respect to kerosene, however, O/W emulsion manifests more efficient burning characteristics than W/O emulsion. Data of thermal analysis suggest that the secondary micro-atomization would be enfeebled with the increase of atmospheric pressure and this is in accord with the trend of the observed result for single droplet burning in diesel environment. A combustion model for both O/W and W/O emulsified fuels is presented
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