The urgency of the issue is reasoned by the necessity to develop environmentally friendly technologies and engineering tools for cleaning emerged mineral oil from insoluble impurities in order to reuse them in the nodes and auto-tractor equipment systems. Hydrocyclone is one of the simplest and most effective means of cleaning waste oil. In order to determine the possibility of hydrocyclone usage in technological lines for purifying oils, it is necessary to establish the influence of its geometrical parameters on the purification quality of such high-viscosity liquid as emerged mineral oils. The purpose of the article is to study theoretically the cylindro-conical hydrocyclone geometrical parameters influence on the purification degree of emerged high-viscosity mineral oils from insoluble and wear debris. The leading approach to the study of this problem is the consideration of the behavior of a non-soluble particle in an oil stream under the influence of forces acting on it, which allows identifying the geometric and regime parameters of a cylindro-conical hydrocyclon. These parameters have the greatest influence on the oil purification degree. The article presents a theoretical justification for the geometrical parameters influence of a cylindrical-conical hydrocyclone on the emerged oil purification degree, a separation criterion, which allows not only determining the optimal size of a hydrocyclone, but also conducting a comparative assessment of hydrocyclones with different geometric parameters by oil purification efficiency from insolubles. Theoretical researches are aimed at determining the cylindro-conical hydrocyclone geometric parameters, depending on the pollution intensity of the emerged mineral oil and the desired degree of its purification from insolubles.

The article is devoted to the solution of the problem associated with the partial substitution of marketable mineral diesel fuel (DF) with mixed vegetable-mineral (MDF) engine fuel. The bio-component of MDF is vegetable oil, for example, Camelina seed oil. A design option of a dual-fuel feeding system has been proposed, the main component of which is a mixing and metering unit for vegetable oil and mineral diesel fuel which allows electric metering units controlled by an electronic control unit (ECU) to respond to signals from diesel load-speed sensors (crankshaft speed, injector rack position (fuel injection pump)) and temperature gauge of camelina oil, to ensure the feed of mixed diesel fuel with components of different content. The use of mixed diesel fuel based on vegetable oil, containing for example 50 % of mineral commercial fuel and 50 % of camelina oil, makes it possible with a slight decrease in the effective power (not more than 6 %) and some increase in the specific effective consumption of mixed fuel (up to 14 %) to save 50 % of fuel of petroleum origin, as well as to reduce the smoke opacity of exhaust gases by 17-20 % and reduce the content of carbon oxide by 35-40 % compared with the work of a diesel engine on commercial mineral diesel fuel.

No abstract

The immediacy of the problem under investigation is connected with the need for the development of the environmentally friendly technologies for cleaning of the used mineral oils from the insoluble impurities. The purpose of this article is to describe the theoretical investigation of the influence of the geometrical parameters of the cylindroconical hydrocyclone upon the degree of cleaning of the used high-viscosity mineral oils from the insoluble impurities and from the wear metal particles. The main approach to the investigation of this problem is as follows: analysis of the behavior of an insoluble particle in the stream of oil under the influence of the forces, which act upon the particle. Such analysis makes it possible to determine the geometrical and operating parameters of the cylindroconical hydrocyclone, which exert the greatest influence upon the degree of cleaning of oils. This article presents the theoretical justification of influence of the geometrical parameters of the cylindroconical hydrocyclone upon the degree of cleaning of the used oil. In addition, this article describes the separation criterion, which makes it possible to determine optimum dimensions of the hydrocyclone and perform a comparative assessment of the hydrocyclones with different geometrical parameters in respect of the efficiency of cleaning of oils from the insoluble impurities.