27 research outputs found
Dimethyl ether as a renewable fuel for diesel engines
ArticleThe area of automotive fuel, or fuel components, which can be produced from biomass
also includes dimethyl ether, otherwise known as DME. The issue of the use of DME as a fuel is
one which has been monitored until recently. Biomass can also be used as the raw material for
the production of DME. DME has therefore replaced the previously-used CFCs
(chlorofluorocarbons), which are now banned for their role in dangerous levels of ozone
depletion. With regard to its physical properties and combustion characteristics, it is currently
expected that DME will soon apply significantly as a fuel in the municipal sector and in
households, and as an alternative fuel for motor vehicles with diesel engines. DME is a suitable
fuel for diesel engines and can be considered as one of the most promising diesel fuel
replacements. DME is a suitable fuel for diesel engines mainly due to its low self-ignition
temperature and good cetane figures. It is well miscible with most organic solvents and because
the polar solvent is water-immiscible. The advantage is its high levels of purity, and its being free
of sulphur, nitrogen, or metals. The physical properties of DME are very similar to the physical
properties of LPG. DME requires relatively complex and costly fuel accessories, but the original
compression ratio of the diesel engine is maintained. A diagram of the fuel system is illustrated
in the paper. The paper analyses the dependence of vapour pressure on temperature, the
dependence of the density on temperature, kinematic viscosity, the flash point, the boiling point,
and the solubility of water. The objective is to evaluate this interesting energy source for
applications in diesel engines
FIBRE CONCRETE 2011 APPLICATION OF FIBRE CONCRETE FOR THE BRIDGE OVER LOCHKOV VALLEY IN PRAGUE
Abstract The large continuous frame bridge on the motorway ring around Prague has composite steel and concrete box superstructure. The reinforced concrete deck slab has polypropylene micro-fibers admixture and taper-threaded splicing system for main longitudinal reinforcing bars in order to minimize cracking development