alexa Hydraulic Injection Characteristics Of Different Biofuels
ISSN: 2090-4541

Journal of Fundamentals of Renewable Energy and Applications
Open Access

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5th World Bioenergy Congress and Expo
June 29-30, 2017 Madrid, Spain

Raphael Lechner, Nicholas O Connel, Johannes Neumann and Robert Daschner
Technical University Amberg-Weiden, Germany
Fraunhofer UMSICHT, Germany
ScientificTracks Abstracts: J Fundam Renewable Energy Appl
DOI: 10.4172/2090-4541-C1-029
Abstract
As a part of a joint research project of the Centre of Excellence for combined Heat and Power and Fraunhofer UMSICHT, the hydraulic injection characteristics of various biofuels for diesel engine operation were investigated. The measurements were carried out using a standard configuration common-rail injection system with a high pressure pump feeding into a common rail and a solenoid injector. The system was mounted on an injection system test bench, which was developed at the Technical University of Applied Sciences Amberg-Weiden (c.f. figure). The test bench features an IAV injection analyzer, which allows direct shot-toshot measurement of injection rate and injection quantity for multiple injections per cycle, e.g. pre, main and post injection. The different biofuels investigated were pure rape seed oil, biodiesel, and crude bio-oil obtained from biogas digestate via Thermo- Catalytic Reforming (TCR®), a process developed at Fraunhofer UMSICHT. Calibration fluid according to ISO 4113 was used as reference fuel. The measurements were carried out at different rail pressures and injection durations in order to obtain the injector map for the different fuels. Additionally, measurements with different pre and post injection timings were performed to determine the closest possible timing of multiple injections according to the main injection. The resulting injector maps clearly show the pressure dependency of injection quantities. Fuels with higher viscosity generally show considerable deviations from the reference fuel at lower injection pressures, whereas the differences diminish at higher injection pressures. Analysis of multiple injections shows that there is a minimum required lag time between the injection pulses to avoid converging of the individual injections. This lag time is generally higher when using fuels with higher viscosity. Both phenomena indicate the need for recalibrating injector mappings and timings for engine operation when utilizing biofuels with fluid characteristics deviating from the reference fuel.
Biography

Raphael Lechner has completed his studies in Environmental Engineering, Renewable Energies and Energy Efficiency at the Universities of Amberg and Kassel. He is Head of R&D at the Institute of Energy Technology at the Technical University of Applied Sciences Amberg-Weiden and since 2014 Director of the Bavarian Center of Excellence for Combined Heat and Power Generation.

Email: [email protected]

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