Influence of zone formation on stability of continuous fluidized bed layering granulation with external product classification

Influence of Thermal Conditions on Particle Properties in Fluidized Bed Layering Granulation

“…In the first simulation scenario, it was shown that the designed model was capable of reproducing the experimental observations of Schmidt et al [7], as well as the theoretical findings of Dreyschultze et al [18] and Radichkov et al [16]. In particular, it was shown that the milling process has a major influence on the dynamics of the FBLG: while coarse milling, characterized by a large mean diameter of milled particles µ mill , leads to the formation of a steady state, fine milling induces self-sustained oscillations.…”

“…To validate the dynamic model, simulation results were compared to the outcome of the theoretical studies of Radichkov et al [16] and Dreyschultze et al [18], as well as to the experimental findings of Schmidt et al [7], Rieck et al [9], and Hoffmann et al [10]. Table 1 presents the simulation scenarios.…”

“…Table 1 presents the simulation scenarios. While the first simulation scenario, inspired by [7,16,18], put the focus on the dynamic behavior with respect to the size of milled particles, the second and third scenario investigated the influence of thermal conditions on particle porosity p . Rieck et al [9] proved by means of batch experiments, illustrated in Figure 6 and Table 2, a correlation of p with operation parameters: an increase of the injection rateṁ inj and/or a reduction of the temperature of the fluidization medium θ f ,in leads to a more porous particle surface.…”

“…From the nature of the process, as shown in Figure 2, it becomes clear that not all particles are sprinkled at a time. Therefore, Hampel et al [17], Dreyschultze et al [18], and Neugebauer et al [19] introduced a dynamic model with two interconnected functional zones: wet and drying zone. In the first, particles are sprinkled with the injected liquid, while in the second, drying of the particles takes place.…”

“…In the first, particles are sprinkled with the injected liquid, while in the second, drying of the particles takes place. Based on the derived models, Dreyschultze et al [18], Bück et al [20], and Neugebauer et al [19] investigated the influence of zone formation and process configurations on process behavior by means of a rigorous stability analysis. However, thermal conditions were not taken explicitly into account.…”