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Regimes of large-scale fluidized beds for solid fuel conversion

Bo Leckner (Institutionen för energi och miljö, Energiteknik)
Powder Technology (0032-5910). Vol. 308 (2017), p. 362-367.
[Artikel, refereegranskad vetenskaplig]

The description of the fluidization behavior of Group B particles is ambiguous at high velocities in wide vessels like those in commercial solid-fuel converters, such as boiler furnaces and gasifiers. Bubbling, turbulent, and fast-fluidization regimes are analyzed here, especially related to fuel converters. It is claimed that the bottom bed in fluidized-bed boilers is operated in a bubbling regime of fluidization even at high gas velocities accompa- nied by a tall splash zone, as long as there is sufficient bed material in the system. It is also shown that the upper part of conventional circulating fluidized-bed boilers operates in a dilute-flow mode. In denser flows, a compar- ison between transport velocity and terminal velocity indicates that clustering flow is much stronger for Group A particles than for Group B, and hence, fast fluidization should be less developed for Group B than for Group A par- ticles. The in fluence of temperature is also shown.

Nyckelord: Fluidization regime; Circulating fluidized bed; Boiler; Gasifier; Solid fuel;



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Denna post skapades 2016-12-27. Senast ändrad 2017-03-22.
CPL Pubid: 246512

 

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