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Magnetic tracking of a fuel particle in a fluid-dynamically down-scaled fluidised bed

Anna Köhler (Institutionen för energi och miljö, Energiteknik) ; David Pallares (Institutionen för energi och miljö, Energiteknik) ; Filip Johnsson (Institutionen för energi och miljö, Energiteknik)
Fuel Processing Technology (0378-3820). Vol. 162 (2017), p. 147-156.
[Artikel, refereegranskad vetenskaplig]

The mixing of a fuel particle in a fluid-dynamically down-scaled bubbling fluidised bed was studied using magnetic particle tracking. Both the resulting steady-state fuel distributions and the underlying mixing dynamics (fuel velocity field) were investigated. The experimental set-up applied resembles the mixing of an anthracite coal particle in a bed with a cross-section of 0.85 × 0.85 m2 operated at 900 °C with fluidisation velocities in the range of 0.16–0.45 m/s and bed heights in the range of 0.25–0.35 m. Four different gas distributors with variable pressure drops and orifice configurations were investigated. For the cases studied, 7.5 min of sampling time at a sampling frequency of 20 Hz was found to be sufficient to resolve the spatial distribution of the tracer. However, to provide a reliable estimate of the mixing dynamics, a sampling frequency of at least 100 Hz was required, together with a sampling time of approximately 20 s. Results on axial mixing showed improved mixing with increasing fluidisation velocity and bed height. The lateral dispersion coefficients were in the order of 10− 3–10− 2 m2/s (on an up-scaled basis), increased with fluidisation velocity, and were only moderately influenced by the configuration of the gas distributor.

Nyckelord: Fluid-dynamical scaling , Fluidised bed , Fuel mixing , Magnetic particle tracking , Solids mixing



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Denna post skapades 2017-05-05. Senast ändrad 2017-07-04.
CPL Pubid: 249146

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik (2005-2017)

Ämnesområden

Energi
Hållbar utveckling
Termisk energiteknik
Strömningsmekanik

Chalmers infrastruktur

Chalmers Kraftcentral (CK)