Abstract
A combined ultrasound and ultrahigh frequency electromagnetic treatment of the blended fuel, which consists of diesel mineral fuel (DF) and methyl ester of rapeseed oil (MERO), allows reducing viscosity of the biodiesel fuel. We experimentally examined the influence of ultrasound, ultrahigh frequency electromagnetic and mechanical treatment of blended biodiesel on its viscosity. It is established that the optimal treatment period for the blends of biodiesel fuel with ultrasound is 5 minutes that makes it possible to reduce viscosity of the product by 20 % on average. We also found a positive effect of UHF electromagnetic field on the blends of diesel fuel with methyl ester of rapeseed oil during for 5 minutes, which allowed us to reduce viscosity of the product by 5.6 % on average. A treatment of the blends of biodiesel fuel in a mechanical homogenizer did not lead to improvement in the fuel viscosity and, after 60 days of observation, viscosity remained at the same level as prior to the treatment. It was established that the combined effect of a 3-minute ultrasound and ultrahigh frequency electromagnetic treatment of the blend with 90 % DF + 10 % MERO and with 80 % DF + 20 % MERO made it possible to reduce viscosity of the biodiesel fuel by 16.3 % and 15.8 %, respectively, relative to the untreated blended fuel. Viscosity in the given blends, relative to the mineral diesel fuel, decreased by 9.3 % and 1.2 %, respectively.
Highlights
According to the forecast of the International Energy Association (IEA), the world production of biofuels will increase by 2030 to 92–147 million tons [1].Creation of fuel for diesel engines from organic raw materials will make it possible to transform plant growing from the industry, which is the main consumer of light oil, into the industry that produces ecologically clean motor fuel from renewable sources of energy
The aim of present experimental study is to reveal the influence of ultrasound, ultrahigh frequency (UHF) electromagnetic and mechanical treatment on the viscosity of blended biofuel, which consists of diesel fuel and methyl ester of rapeseed oil (MERO)
In order to reduce viscosity of the blend of diesel fuel with MERO by 20 % on average, it is sufficient to expose it to the ultrasound for 5 minutes
Summary
According to the forecast of the International Energy Association (IEA), the world production of biofuels will increase by 2030 to 92–147 million tons [1]. Practical use of biodiesel fuel in Ukraine is officially approved by the national standard DSTU 4840:2001 «Diesel engine fuel of high quality. With an increase in the share of methyl ester of vegetable oils (MEVO) in diesel fuel (DF) exceeding 5 %, the viscosity of biodiesel (that is, a mixture of MEVO and DF) grows. This results in the coking of fuel equipment, reduction in the capacity of diesel engine and rise in its fuel consumption [5, 6]. The development of methods and devices that would reduce the viscosity of biodiesel fuel whose formulation includes more than 5 % of MEVO is absolutely relevant today
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