The Optimization of Bucket Discharge to Maximize the Transported Volume and to Minimize Material Fall Down the Shaft
In order to propose possible optimizations, the Wista bucket elevator was also used to observe the discharge of buckets and whether it causes any loss due to material falling back into the return or working shafts. The material flow was simulated and computed in both shafts of the bucket elevator. The simulation results were evaluated via the vertical cut of the buckets to investigate the behavior of speed fields inside the bucket. Figure 13.1 shows the cut of the first shaft in 3D. The shaft transports Steel grit, grain size W 5 mm × H 5 mm × L 8 mm. Another cut used for the evaluation shows the second shaft. This shaft transports Steel grit, grain size W 10 mm × H 10 mm × L 14 mm. The simulations were calculated for 17 speeds, from 0.39 m·s−1 to 1.97 m·s−1. Figures 13.2, 13.3, 13.4, 13.5, 13.6, 13.7, 13.8, 13.9, 13.10, 13.11, 13.12, 13.13 and 13.14 show selected results for the gravity, mixed, and centrifugal discharge.