Prospects of Using Hydrogen Microaddition to Improve Diesel Engine Ecological Indicators
Journal Title: Проблеми машинобудування - Year 2019, Vol 22, Issue 2
Abstract
The problem of environmental degradation in megapolises, particularly because of the toxicity of the exhaust gases of transport engines, requires an integrated solution. The peculiarity of the processes of mixture formation and combustion in diesel engines is the presence of local areas, rich in fuel or air. This results in in-complete diesel fuel combustion and contributes to the formation of toxic and mutagenic-carcinogenic compounds. Exhaust gases from diesel engines contain solid particles (SPs) that, due to their developed surface, are carriers of mutagenic-carcinogenic compounds. A very important factor affecting the com-pleteness of fuel combustion in the cylinder of an internal combustion engine (ICE) is the intensive heat exchange between the walls of the combustion chamber and the working fluid. As a result, a relatively cold gas wall layer occurs. In this layer, the unburned hydrocarbons CnHm reside, and SPs are formed. The mi-croaddition of hydrogen to the incoming charge makes it possible to significantly reduce the thickness of the “cold” layer due to the intensification of the combus-tion process in the ICE cylinder and near-wall areas. The generation and use of hydrogen, on board a vehicle, as a microaddition to normal engine fuel is justified as follows. First, the activation of combustion processes in the engine cylinder and, accordingly, fuel combustion completeness increase, which helps reduce the level of mass emissions of SPs and unburned hydrocarbons with the exhaust gases from ICEs. Secondly, such an approach makes it possible to reduce the level of load on the regular exhaust gas neutralization systems of modern vehicle engines, and increase the reliability of their work and their resource. The design of the on-board small-size electrolyzer and its control algorithm are developed. Compre-hensive motor studies of the influence of hydrogen microadditions to diesel fuel on the effective 1Ch 8.5 / 11 diesel engine performance and the toxicity of its exhaust gases were carried out. Experimental studies show that with hydrogen microaddi-tions, owing to an increase in fuel reactivity and combustion completeness, carbon monoxide emissions and smoking at the exhaust are reduced by 5–6% and 20%, respectively, with practically no unburned hydrocarbons present. The use of the proposed design and algorithm of the on-board electrolyzer operation will signifi-cantly reduce the level of toxicity of the exhaust gases from vehicle ICEs with minimal energy consumption for the functioning of the system.
Authors and Affiliations
Andrii M. Avramenko, Anton M. Lievtierov, Valerii M. Bhantsev, Nataliia Yu. Hladkova, Vira M. Kirieieva
Keywords
Related Articles
- EP ID EP622800
- DOI 10.15407/pmach2019.02.070
- Views 72
- Downloads 0
Investigation of the Stress Strain State of the Layer with a Longitudinal Cylindrical Thick-Walled Tube and the Displacements Given at the Boundaries of the Layer
This paper proposes an analytical-numerical approach to solving the spatial prob-lem of the theory of elasticity for the layer with a circular cylindrical tube. A cylin-drical empty thick-walled tube is located inside th...
Shear Modulus of a Fiber Composite with a Transtropic Viscolelastic Matrix and Transtropic Elastic Fiber
When solving the problems of deformation solid mechanics, the inhomogeneous composite material is modeled as homogeneous, with averaged mechanical properties − effective characteristics. The purpose of this paper is to d...
Mathematical simulation of thermal condition of a brush contact device in three-dimensional setting
A detailed review of the existing design of brush contact devices for 200 MW to 600 MW turbo-generators is performed. The peculiarities of brush contact devices working in tandem with turbo-generators of various firms ar...
Use of computer technology in modernization of head covers for hydraulic turbines of PL20-V-500 type
One of the problems faced by a designer in the modernization of operating generating units is the analysis of the feasibility of ensuring the strength and reliability of turbine parts and components in their further cont...
Experimental Study of the Effects of a Constant and Variable Electric Fields on the Strength Properties of the Blade Steel Surface Layer
It is known that in wet steam turbines the wet steam flow is electrified when passing through the turbine flow path. In this, the mutual electrification of the condensed moisture flow and flow path surfaces occurs. Until...