Solids flow patterns in large-scale circulating fluidised bed boilers: Experimental evaluation under fluid-dynamically down-scaled conditions
Journal article, 2021

This work aims at gaining novel knowledge of the mechanisms governing the solids flow pattern in the furnace of large-scale Circulating Fluidised Bed (CFB) boilers. A fluid-dynamically down-scaled unit resembling an existing 200-MWth CFB boiler was built and validated against full-scale data. The extensive experimental campaign showed, among others, that the presence or absence of a dense bed governs the entrainment of solids from the bottom region of the furnace, and that the back-flow of solids at the exit region is negligible at low gas velocities although it quickly becomes significant with an increase in gas velocity. Thus, it is shown that the estimation of the external solids flux by the top flux in the furnace is not generally valid.

Circulating fluidised bed

Solids entrainment

Solids flow pattern

Fluid-dynamical scaling

Dense bed

Author

Tove Djerf

Chalmers, Space, Earth and Environment, Energy Technology, Energy Technology 2

David Pallarès

Chalmers, Space, Earth and Environment, Energy Technology

Filip Johnsson

Chalmers, Space, Earth and Environment, Energy Technology

Chemical Engineering Sciences

0009-2509 (ISSN)

Vol. 231 116309

Subject Categories

Energy Engineering

Ocean and River Engineering

Fluid Mechanics and Acoustics

DOI

10.1016/j.ces.2020.116309

More information

Latest update

2/1/2021 1