Feststoffturbine zur Energierückgewinnung in Kombination mit Gurtförderanlagen

Prenner, Michael

doi:10.1007/s00501-014-0327-0

Cited by 4 publications

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“…The torque of 200 Nm at a rotational speed of 40.6 rpm led to a power output of 850 W. Figure 11. Average torque at maximum mass flow [12].…”

Section: Test Phasementioning

confidence: 99%

Energy Recovering System for Moving Bulk Materials

Prenner¹

2019

EARTH

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Bulk materials, which are transported on continuous conveyors, partly have a high energy content, depending on the specified mass flow and the conveying velocity. At discharge points to a storage area or at transfer points from one conveyor to another, the energy content often increases due to the elevation of the discharge conveyor. At these points it is possible to recover a large part of the energy due to the mass flow (conveying velocity) and the drop height of the bulk material. This energy is usually converted into "wear" of the conveying system or the bulk material at discharge or transfer points. Furthermore, it is available free of charge and could be used to achieve more environmentally friendly continuous conveying systems. This research paper is focused on a new method which has been developed and patented by the "Chair of Mining Engineering and Mineral Economics -Conveying Technology and Design Methods" at the Montanuniversität Leoben / Austria. This invention makes it possible to recover a large part of the above mentioned energy. The invented so-called "Solid State Material Driven Turbine" allows the recovery of this energy directly to the conveying system using a traction drive, or to the electric circuit using a generator. The paper describes the new method and presents turbine prototypes that have been designed using simulations and tested under laboratory condition and in operational trials. Additionally, a discussion concerning the costs and economical aspects of the invention is included. For a special application of such a turbine a permanent magnetic safety coupling can be used. First test results of such a coupling are presented. The paper also includes layout criteria for an overshot "Solid State Material Driven Turbine". All executed experiments showed, that a recovery of energy from moving bulk materials using a "Solid State Material Driven Turbine" is possible. An efficiency of more than 50% can be realised. The occurred challenges during the tests phase under real conditions can be managed effortlessly.

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“…The torque of 200 Nm at a rotational speed of 40.6 rpm led to a power output of 850 W. Figure 11. Average torque at maximum mass flow [12].…”

Section: Test Phasementioning

confidence: 99%

Energy Recovering System for Moving Bulk Materials

Prenner¹

2019

EARTH

Self Cite

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Solid State Material Driven Turbine to Reduce Segregation during Bunker Filling

Denzel

Prenner

Sifferlinger

2023

Berg Huettenmaenn Monatsh

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For most applications and their following processes, an evenly distributed bunker outflow is desired in terms of particle size. Various discrete element simulations were performed to analyze the current state of an existing bunker used for storage of blast furnace sinter, which is simply filled with a discharging belt conveyor. Great segregation effects could be determined, which are mainly caused by the filling method and further intensified by the core flow effect and bunker geometry.Several concepts and devices to reduce segregation in bunkers were evaluated using DEM. The particle size distributions at the bunker outflow were each compared with the current state without a device. A solid state material driven turbine is presented, which reduces segregation effects during bunker filling and leads to a significant improvement during the discharge. The results show a more evenly distributed bunker outflow in terms of particle size.As sinter is a very abrasive material, the wear at the turbine has also been evaluated. Furthermore, the power output in this case and the potential of energy recovery were investigated, which could be of interest in many other applications.Additionally, the particle degradation at the solid state material driven turbine is evaluated in this case. A newly developed breakage model for DEM is used. The model is based on the particle replacement method, combined with the voronoi tessellation algorithm and breakage probabilities to achieve a high accuracy in terms of fragment size distribution.

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Evaluation of Mixing Effects and Particle Breakage on a Cross Flow Turbine with DEM

Denzel,

Prenner,

Sifferlinger

2024

Berg Huettenmaenn Monatsh

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Various effects during conveying and storage processes lead to size segregation of bulk material, but many applications require a mostly constant particle size distribution. Especially during bunker filling, segregation effects are noticed, which are further intensified by possible core flow effects. In order to reduce segregation effects during bunker filling, a cross flow turbine is installed at a bunker used for storage of blast furnace sinter. In this contribution, discrete element simulations were performed to analyze mixing effects and possible particle breakage due to the cross flow turbine. Significant mixing effects during bunker filling are noticed due to the cross flow turbine. The results show a more evenly distributed bunker outflow in terms of particle size.Particle breakage is analyzed by means of a newly developed breakage model for the Discrete Element Method (DEM). The model is based on a probabilistic particle replacement with voronoi-tessellated fragments. The validated breakage model allows high accuracy in prediction of fragment size distribution. Fragments are further breakable, which allows simulation of processes with several damaging effects. The breakage model was calibrated with a specially developed automated single particle impact tester for rapid analysis of breakage characteristics of bulk materials.

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Feststoffturbine zur Energierückgewinnung in Kombination mit Gurtförderanlagen

Abstract: This kinetic energy based on the continuous conveying process and overcoming the drop height could be returned to the conveyor in the form of electrical or mechanical power. This could be realized with a kind of turbine, the so called "Solid State Material Driven Turbine" .

Cited by 4 publications

References 0 publications

Energy Recovering System for Moving Bulk Materials

Energy Recovering System for Moving Bulk Materials

Solid State Material Driven Turbine to Reduce Segregation during Bunker Filling

Evaluation of Mixing Effects and Particle Breakage on a Cross Flow Turbine with DEM

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