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Herzogenrath, Germany

Hermanns R.T.E.,Oel Waerme Institute gGmbH | Konnov A.A.,TU Eindhoven | Bastiaans R.J.M.,TU Eindhoven | de Goey L.P.H.,TU Eindhoven | And 2 more authors.
Fuel | Year: 2010

This work summarises available measurements of laminar burning velocities in CH4 + H2 + O2 + N2 flames at atmospheric pressure performed using a heat flux method. Hydrogen content in the fuel was varied from 0% to 40%, amount of oxygen in the oxidiser was varied from 20.9% down to 16%, and initial temperature of the mixtures was varied from 298 to 418 K. These mixtures could be formed when enrichment by hydrogen is combined with flue gas recirculation. An empirical correlation for the laminar burning velocity covering a complete range of these measurements is derived and compared with experiments and other correlations from the literature. © 2009 Elsevier Ltd. All rights reserved. Source


Dirks H.,Oel Waerme Institute gGmbH | Van Rheinberg O.,Oel Waerme Institute gGmbH | Lucka K.,Oel Waerme Institute gGmbH | Kohne H.,Oel Waerme Institute gGmbH | And 2 more authors.
Erdoel Erdgas Kohle | Year: 2010

A future prospect for liquid fuels is the blending with biocomponents to Domestic Heating Oil (DHO). Fatty Acid Methyl Esters (FAME) can be used for this purpose because their physical properties are closer to DHO than pure vegetable oil. In September 2008, the pre-standard DIN V 51603-6 "Alternative Domestic Heating Oi", which defines the requirements of blends of mineral oil based Domestic Heating Oil (DHO) with biogenic and alternative compounds, was released. Storage is an important advantage of DHO. That means the fuel can be stored over a long time without any loss of product quality or application suitability. Due to the product characteristics of FAME and vegetable oil, e.g., hydroscopic/unsaturated, it is presumed that the product stability of liquid biofuels in long term storage is affected by the unsaturated FAME- or vegetable oil molecules disadvantageously. To verify this, the ageing of DHO, FAME, and vegetable oil as well as their blends was evaluated over a period of 24 mo. For that purpose, the different blends were stored at 40°C in the presence of ambient air and partly in the presence of copper without any stabilizing additives. To detect parameter changes, the ageing process was monitored by periodical fuel analytics. The most significant parameters regarding the storage behavior and operating reliability of the fuels were also identified. These results indicated to which extent a future additivation of alternative Domestic Heating Oil will be required for the storage in oil-firing systems. Source

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