Simulation von Bowdenzügen im Virtuellen Gesamtfahrzeug

Grandl, Reinhard; Kehrer, Christian

doi:10.1007/s35148-012-0389-9

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…While the reactor dimensions are known, the residence times of either solid or vapor phases are not. Grandl proposes a value of 10.16 s for the solid residence time, while a value of 1.5 s is generally assumed for the vapor residence time, estimated based on the typical sweeping gas flow rate (vapor residence times have not been determined for the bioliq I unit, but a value cap of 4 s has been found for a technically similar but smaller unit . Peters estimated the efficiency of the transport process in auger reactors and concluded that it could be expressed as a function of the Froude number of the system, corresponding to a value of 17.71% assuming an angle of 20° and a pitch tangent of 0.745.…”

Section: Methodsmentioning

confidence: 99%

Modeling Fast Pyrolysis of Waste Biomass: Improving Predictive Capability

Fonseca,

Funke

2024

Energy Fuels

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This paper addresses the need for versatile models in fast pyrolysis to facilitate the exploration of novel feedstocks and process configurations, minimizing capital and operational expenses. Our model aims to resolve two key challenges: defining a secondary pyrolysis network to align primary pyrolysis products with experimental results and addressing issues in modeling condensation loops in steady-state, as observed in various fast pyrolysis implementations, including the bioliq I plant, which serves as the basis for this model. The outcomes are promising, revealing minor discrepancies with experimental values in product distribution (1.5%) and condensate composition (6.0%) postreactor modeling. Further deviations of 3.6% in condensate composition emerge after condenser modeling. Notably, when considering the entire model, discrepancies persist, particularly when applied to biomasses diverging from the calibration material (wheat straw). This research demonstrates the model's efficacy in addressing specific challenges in fast pyrolysis simulation, emphasizing its adaptability to diverse conditions. However, ongoing refinement is essential for enhancing overall predictive accuracy, particularly in scenarios with varying biomass characteristics. The findings contribute valuable insights to the field, paving the way for more robust and adaptable models in the exploration of fast pyrolysis.

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Section: Methodsmentioning

confidence: 99%

Modeling Fast Pyrolysis of Waste Biomass: Improving Predictive Capability

Fonseca,

Funke

2024

Energy Fuels

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“…The frequencies that were simulated ranged from 0.75 to 12 Hz. The parameters for the bulk material derived from earlier works and are listed in Table . , Most of the experiments were done with steel spheres only because the computation times when biomass was included were much longer than without. In general, it is expected that the particle size should not have a big influence on the axial speed of the individual particles, but at least for powders, different levels of compressibility seem to have one on the mass flow .…”

Section: Methodsmentioning

confidence: 99%

Numerical Validation of a Screw Conveyor Design Method

Aschenbrenner,

Funke

2024

Energy Fuels

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Screw conveyors and feeders are a common way to transport a variety of granular bulk material. There is also the possibility of using them as reactors themselves, where they represent an interesting alternative to other common reactor types, for example, the pyrolysis of biomass or plastics. However, the scale-up and design of screw conveyors remains a challenging topic. Even though the fundamental design has been applied for several decades, things like granular mixing and transport are still not fully understood. A lot of the research on the transport of screw conveyors is focused on single-screw setups. This leads to the reliance on empirical data or in-house experience for conveyor design. For that reason, it is important to develop reasonable guidelines and design tools that are based on scientific principles, which can be further validated by experiments and simulations. In this work, findings from a dimensional analysis are combined with auger reactor design criteria that were developed in the 1960s based on extensive experimental work and that were only available in the German literature up until now, and the resulting assumptions are then tested with the help of discrete element method simulations.

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Simulation von Bowdenzügen im Virtuellen Gesamtfahrzeug

Cited by 2 publications

References 2 publications

Modeling Fast Pyrolysis of Waste Biomass: Improving Predictive Capability

Modeling Fast Pyrolysis of Waste Biomass: Improving Predictive Capability

Numerical Validation of a Screw Conveyor Design Method

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