Development and confirmation of a simple procedure to measure solids distribution in fluidized beds using tracer particles

Abstract

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On trajectory and velocity measurements in fluidized beds using positron emission particle tracking (PEPT)

“…The two particle types were used in the experiments: silica sand (d 50 312 μm; Geldart group A) and fluid Cracking Catalyst (FCC; d 50 100 μm; Geldart group B); full size distributions are given by Dubrawski et al [1] The experimental techniques used to investigate the bed behaviour included optical probes of various types, PIV, electrical capacitance tomography, X-ray computed tomography, and two types of radiation-based particle tracking, of which PEPT is one. Full details of results obtained using these techniques are given in other references [2][3][4]28,29] ; the present paper considers only results obtained from the PEPT data.…”

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

“…Bubbling fluidization of a sand-biomass mixture was compared against experiment for degree of mixing and pressure drop (average and fluctuations) [94,95]. Different testing methods for measuring solids distribution have been compared and improved by simulating the so-called "travelling fluidized bed" [96]. A coarse-graining application to segregation in vibrated fluidized beds can be found in Reference [97].…”

11CO2 positron emission imaging reveals the in-situ gas concentration profile as function of time and position in opaque gas-solid contacting systems

“…As a non-invasive imaging technique, PET can provide 3D tomography images in real-time of a radio-active tracer distribution and give quantitative information on both position and concentration. Positron emission particle tracking was previously and successfully applied when using a particle-labelled tracer, in various liquid-solid [8][9][10][11][12]18] and gas-solid applications [5,6,[19][20][21][22]. Many reactant molecules can be labelled with short half-life time (t 0.5 ) positron-emitting nuclides of carbon ( 11 C, t 0.5 = 20.4 min), nitrogen ( 13 N, 9.96 min) and oxygen ( 15 O, 2.07 min).…”