TY - JOUR

T1 - Solid State Material Driven Turbine to Reduce Segregation during Bunker Filling

AU - Denzel, Michael

AU - Prenner, Michael

AU - Sifferlinger, Nikolaus August

PY - 2023/1/13

Y1 - 2023/1/13

N2 - 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 existingbunker used for storage of blast furnace sinter, whichis simply filled with a discharging belt conveyor. Great segregation effects could be determined, which are mainly caused by the fillingmethod and further intensified by the core floweffect and bunker geometry. Several concepts and devices to reduce segregation in bunkers were evaluated using DEM. The particle size distributionsat 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 improvementduring the discharge. The results show a more evenly distributed bunker outflow in terms of particle size. As sinter is a very abrasivematerial, thewear 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 developedbreakage 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 sizedistribution.

AB - 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 existingbunker used for storage of blast furnace sinter, whichis simply filled with a discharging belt conveyor. Great segregation effects could be determined, which are mainly caused by the fillingmethod and further intensified by the core floweffect and bunker geometry. Several concepts and devices to reduce segregation in bunkers were evaluated using DEM. The particle size distributionsat 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 improvementduring the discharge. The results show a more evenly distributed bunker outflow in terms of particle size. As sinter is a very abrasivematerial, thewear 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 developedbreakage 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 sizedistribution.

KW - Size segregation

KW - Particle size distribution

KW - Energy recovery

KW - Particle breakage

KW - Discrete element method

KW - Blast furnace sinter

KW - Cross flow turbine

U2 - 10.1007/s00501-022-01311-6

DO - 10.1007/s00501-022-01311-6

M3 - Article

VL - 168.2023

SP - 62

EP - 70

JO - Berg- und hüttenmännische Monatshefte : BHM

JF - Berg- und hüttenmännische Monatshefte : BHM

SN - 1613-7531

IS - 2

ER -