CLEANING USED MOTOR OIL FROM MICRON AND SUBMICRON PARTICLES IN SUPERCENTRIFUGE
Waste oils are classified as hazardous waste due to their insolubility, chemical resistance, the presence of toxic chemical compounds and heavy metals. The processes of regeneration and recovery of waste engine oil are resource-efficient and environmentally friendly measures, so the processing of 100 tons of waste oil can be obtained more than 80 tons of the finished product without environmental impact. The basis of these measures is the removal of mechanical impurities and water droplets by physical treatment of oil using centrifuges. At the same time, the known studies in this direction are reduced to the modeling of regime and design parameters of modernized centrifugal machines, which do not allow to evaluate the integral and local degrees of purification, including for standardized centrifuges. In work the mathematical model of integral and local degrees of particulate matter and conducted an analytical study of purification of used engine oil in tubular industrial sverhsekretnoj type ORT with the organization of a single-layer (normal) and double layer (modernized version) of fluid. Established that in sverhsekretnoj in single layer mode, the centrifugal oil separation is provided by 90.4 percent degree of purification when the separation factor 12236.5 and if two-layer mode with recycle for fugato1.0 - 96.4% when the separation factor 16085.6. With an increase in the total flow rate along the rotor wall of the purified oil and Fugate in 2 times the Reynolds number increases from 955 to 1911 and does not exceed the critical value of the 2300, at which it is possible to carry particles of the dispersed phase. It was found that particles of the dispersed phase with the size from 2.0 to 4.2 mk at single-layer separation and from 1.6 to 4.2 mk at two-layer flow were 100 % captured. In this case, the range of effective use of the recycle is from 1.0 to 1.5.