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The influence of nanoadditives of organic and inorganic origin on the rheological properties of heavy fuel oil was considered. Diproxamine, an oil soluble nonionic surfactant, multiwalled carbon nanotubes of the carbon nanomaterial Taunit and dehydrated carbonate sludge were used as additives. The search for optimal concentrations of the applied nanoadditives and the values of the change in the viscosity of the resulting composite fuel was carried out. The authors’ studies of the fuel oil samples viscosity have shown the possibility of improving its rheological properties by introducing nanostructured additives diproxamine (0.5 wt. %), carbon nanotubes of the carbon nanomaterial Taunit (0.0125 wt. %) or dehydrated carbonate sludge (0.1 wt. %). The observed change in viscosity was 10-20%. It has been established that diproxamine improves viscosity properties of fuel at sufficiently high temperatures (75 С), and its joint application with nanotubes is effective even at lower temperatures (65 С). It was shown that the use of dehydrated carbonate sludge also leads to a decrease in the boiler fuel viscosity. The existence of a synergistic effect in the joint application of CNTs with carbonate sludge has been established. Possible mechanisms for changing the viscosity properties of fuel were considered. Keywords— fuel oil, carbon nanotubes, viscosity, surfactant

Influence of Nanoadditives on Rheological Properties of Fuel Oil