Kampanart Theinnoi

Engine performance and emissions from the combustion of low-temperature Fischer-Tropsch synthetic diesel fuel and biodiesel rapeseed methyl ester blends

The combustion of oxygenated biodiesel (rapeseed methyl ester (RME)) improves the engine-out particulate matter, hydrocarbon and carbon monoxide (CO) emissions, while the low-temperature Fischer?Tropsch synthetic paraffinic diesel fuel improves engine-out NOx, CO, hydrocarbon and particulate matter emissions. Blending synthetic diesel (SD) fuel with oxygenated biodiesel could unlock potential performance synergies in the fuel properties (e.g. O2 content in RME and high cetane number of the synthetic fuels) of such blends and benefit engine performance and emissions. The combustion of synthetic diesel fuel/RME blend, named synthetic diesel B50, has shown similar combustion characteristics to diesel fuel, while simultaneous improvements in engine efficiency and smoke-NOx trade-off were achieved by taking advantage of the fuels properties. The engine thermal efficiency was dependent on the fuel type, and followed the general trend: synthetic diesel > SDB50 > diesel > RME. Therefore, it has been shown that the design of a synthetic fuel with properties similar to the fuel blends presented in this work could improve engine-out NOx, smoke and hydrocarbon emissions and maintain or improve engine performance.

Influence of Fuel Properties, Hydrogen, and Reformate Additions on Diesel-Biogas Dual-Fueled Engine

AbstractBiomethane and biogas produced from waste (i.e.,xa0from an anaerobic digester) have shown themselves to be promising fuels for internal combustion engines. They can improve fuel security and contribute in reducing emissions, including CO2, when used as a supplement to diesel fuel in dual-fueled diesel engines. In this work the influence of diesel fuel properties, H2 and reformate (H2 and CO) additions on the performance of diesel-biogas dual-fueled engines are studied. Biogas, with a composition of 60% CH4 and 40% CO2 by volume, was introduced to the engine intake manifold; reducing the utilization of the in-cylinder injected diesel fuel. Under diesel-biogas fueling, engine out NOX, PM and smoke emissions were reduced. However, the combustion patterns were altered, and under high biogas concentrations (those that were greater than 60% reduction of the diesel fuel) combustion stability became an issue, leading to increased CO and HC emissions. The influence of the in-cylinder injected diesel fuels, o...

Effect of Physical Properties of Porous Combustor on Radiant Output and Fuel-Preheated Efficiency of a Non-Sprayed Porous Burner

The effect of physical properties of porous combustor on performance of a non-sprayed porous burner (NSPB) in term of radiant output and fuel-preheated efficiency is studied through numerical modeling. The homogeneous combustion of vaporised kerosene and combustion air within a porous combustor (PC) is instead of the heterogeneous combustion occurs in free space of a conventional sprayed burner. The excellent fuel evaporation without atomisation is accomplished by using porous evaporator (PE). Single global reaction combustion, sub-cooled boiling, local non-thermal equilibrium between fluid and solid phases with phase change under complex radiative heat transfer and sub-cooled boiling are considered. The parametric study of porosity and optical thickness are investigated. The study shows that the radiant output efficiency is decreased with higher porosity while the fuel-preheated efficiency quite constant. The optical thickness has no significant effect on radiant output efficiency whereas the fuel-preheated efficiency is reduced with higher optical thickness. In addition, the evaporation front zone moves deep to downstream of PE when optical thickness increases.