Solids backmixing and entrainment in the splash zone of large-scale fluidized bed boilers
Artikel i vetenskaplig tidskrift, 2022

This work studies the fluid dynamics of the solids in the splash zone of fluidized bed furnaces, with focus set on solids back-mixing and solids entrainment in order to enhance the understanding and prediction of the solids flow in the bottom region of the furnace. Experimental results show the establishment of a splash zone also for runs in absence of a dense bottom bed. A simple model assuming ballistic trajectories of the ejected solids is shown to satisfactorily estimate the solids back-mixing rate. The flux of non-backmixed solids, which are entrained from the bottom region, is found to be unaffected by the bottom wall configuration (tapered/vertical) for a given gas flow. Finally, an empirical expression is proposed for the solids entrainment from the bottom region which covers wide operational and unit size ranges.

Solids flow

Solids entrainment

Splash zone

Fluidized bed

Solids back-mixing

Författare

Tove Djerf

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

David Pallarès

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Filip Johnsson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Powder Technology

0032-5910 (ISSN) 1873-328X (eISSN)

Vol. 404 117471

Ämneskategorier

Energiteknik

Havs- och vattendragsteknik

Strömningsmekanik och akustik

DOI

10.1016/j.powtec.2022.117471

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Senast uppdaterat

2022-05-19