Mass transfer intensification between fluidizing gas and Geldart‐B nonmagnetizable particles in magnetized fluidized bed

Abstract

This work aimed to intensify the mass transfer between fluidizing gas and Geldart‐B nonmagnetizable particles by simultaneously introducing magnetizable particles and applying the magnetic field. The mere addition of magnetizable particles hardly affected the interphase mass transfer. Moreover, such mass transfer was not improved by the subsequent application of the magnetic field under the magnetization‐LAST operation mode. However, the mass transfer was significantly enhanced by the magnetic field in the magnetic stabilization and transition flow regimes under the magnetization‐FIRST operation mode. Apparently, the mass transfer intensification depended not only on the magnetic field intensify (H) but also on the operation mode. The gas–solid contact performance in the magnetic stabilization flow regime was always comparable to that in fixed beds. Hence, further increases in H could not raise the magnitude of intensification but only increase the operating range and stability of the magnetic stabilization, which was in metastable equilibrium.

Discharge of Packed Magnetizable Particles through Side Orifice in the Absence and Presence of a Magnetic Field

“…Given that the MSB combines major advantages of both the fixed bed (excellent gas−solid contact) and the fluidized bed (low bed pressure drop), 1 its application has been extensively explored in the fields of gas purification via particle adsorption, 2,3 gas/aerosol filtration by granules, 4−7 and gas conversion catalyzed by particles. 8−11 However, as demonstrated in Figure 1, 12,13 the active particles loaded in the MSB would gradually become saturated or inactive over time, causing the single-pass/one-way conversion of influent gas to decrease sharply and eventually affecting its continuous treatment. The regeneration of saturated/deactivated particles in time has become the bottleneck that hinders the commercial application of gas− solid MSBs.…”

“…However, as demonstrated in Figure , , the active particles loaded in the MSB would gradually become saturated or inactive over time, causing the single-pass/one-way conversion of influent gas to decrease sharply and eventually affecting its continuous treatment. The regeneration of saturated/deactivated particles in time has become the bottleneck that hinders the commercial application of gas–solid MSBs.…”