Experimental and Numerical Investigation of the Dynamics of Loop Seals in a Large-Scale DFB System under Hot Conditions
Artikel i vetenskaplig tidskrift, 2015

We investigate the dynamics of the loop seals in a large-scale dual fluidized bed (DFB) system as a function of variations in the flux of the bed material through the seal and changes in the bed material density. These investigations are performed numerically with a computational fluid dynamics (CFD) model and experimentally for the loop seals of the Chalmers 2-4 MWth DFB gasifier. Both experiments and simulations show that more of the aeration gas leaves the loop seal in the direction of the solids when a low-density bed material (silica) is used rather than a high-density one (bauxite). The simulations also reveal homogeneous fluidization in a vertical connection to the loop seal, whereas an inclined connection yields heterogeneous fluidization. The minor discrepancies between the experiments and simulations with silica are attributed to particle agglomeration, and it is proposed that CFD models applied to loop seals should account for this phenomenon.

Particulate flows

Particle Technology

Energy

Fluidization

Computational fluid dynamics (CFD)

Författare

Anton Larsson

Chalmers, Energi och miljö, Energiteknik

Henrik Ström

Chalmers, Energi och miljö, Energiteknik

Chalmers, Tillämpad mekanik, Strömningslära

Srdjan Sasic

Chalmers, Tillämpad mekanik, Strömningslära

Henrik Thunman

Chalmers, Energi och miljö, Energiteknik

AICHE Journal

0001-1541 (ISSN) 1547-5905 (eISSN)

Vol. 61 3580-3593

Drivkrafter

Hållbar utveckling

Ämneskategorier

Energiteknik

Kemiska processer

Kemiteknik

Strömningsmekanik och akustik

Styrkeområden

Energi

Fundament

Grundläggande vetenskaper

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1002/aic.14887