TY - GEN

T1 - Cross Flow Turbine to Reduce Size Segregation Effects in Storage Processes

AU - Prenner, Michael

AU - Denzel, Michael

AU - Sifferlinger, Nikolaus August

PY - 2023/7

Y1 - 2023/7

N2 - In many applications a constant particle size distribution is desired. Various effects lead to size segregation during storage processes. Especially during bunker filling segregation effects are noticed, which are further intensified by possible core flow effects. In this work discrete element simulations were performed to analyze a bunker used for storage of blast furnace sinter, which is filled with a discharging belt conveyor, whereby significant segregation effects are noticed. Several devices including solid state material turbines to reduce segregation during bunker filling were evaluated using DEM. A cross flow turbine is presented, which is proven to significantly reduce segregation effects during bunker filling. The results show a more evenly distributed bunker outflow in terms of particle size. Because sinter is a very abrasive material, the expected wear at the turbine was also estimated with DEM. As the turbine could also be used for energy recovery in other applications, the power output was also investigated. Additionally, the particle breakage due to the cross flow turbine is evaluated in this case. Therefore, a newly developed breakage model for DEM is used. 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 single particle impact tester for rapid analysis of breakage characteristics of bulk materials.

AB - In many applications a constant particle size distribution is desired. Various effects lead to size segregation during storage processes. Especially during bunker filling segregation effects are noticed, which are further intensified by possible core flow effects. In this work discrete element simulations were performed to analyze a bunker used for storage of blast furnace sinter, which is filled with a discharging belt conveyor, whereby significant segregation effects are noticed. Several devices including solid state material turbines to reduce segregation during bunker filling were evaluated using DEM. A cross flow turbine is presented, which is proven to significantly reduce segregation effects during bunker filling. The results show a more evenly distributed bunker outflow in terms of particle size. Because sinter is a very abrasive material, the expected wear at the turbine was also estimated with DEM. As the turbine could also be used for energy recovery in other applications, the power output was also investigated. Additionally, the particle breakage due to the cross flow turbine is evaluated in this case. Therefore, a newly developed breakage model for DEM is used. 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 single particle impact tester for rapid analysis of breakage characteristics of bulk materials.

KW - Solid State Material Driven Turbine

KW - Particle Size Distribution

KW - Bunker Filling

KW - Energy Recovery

KW - Blast Furnace Sinter

KW - Particle Breakage

KW - Discrete Element Method

KW - DEM

KW - PSD

U2 - 10.34901/mul.pub.2023.152

DO - 10.34901/mul.pub.2023.152

M3 - Conference contribution

BT - Proceedings of ICBMH2023 - The 14th International Conference on Bulk Materials Storage, Handling and Transportation

T2 - ICBMH2023 - The 14th International Conference on Bulk Materials Storage, Handling and Transportation

Y2 - 11 July 2023 through 13 July 2023

ER -