5. CFL components
5.1 Fluidizing grid
CFLs generally include a grid for introducing the carrier phase (i.e., the fluid), whose role is essentially to distribute the gas uniformly over the cross-section of the column. In some types of oil risers, the grid is replaced by an injection nozzle projecting fine droplets of oil which vaporize on contact with the hot catalyst coming from the outer bed. For other types of CFL, the distribution grid is similar to that of bubbling fluidized beds. Given the significantly higher fluidization rates for CFLs, it is necessary either to use nozzles with larger holes (several millimeters) to avoid multiplying the number of nozzles, or to accept operating with a greater pressure drop, i.e. above the value of 3,400 Pa which is considered the lower admissible limit (cf....
The Ultimate Scientific and Technical Reference
This article is included in
Unit operations. Chemical reaction engineering
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
CFL components
Recirculation rate and population balance
References
Conventions/Workshops
(non-exhaustive list)
-
The most important meeting is the International Conference on Circulating Fluidized Beds (CFB).
This conference is held every two years.
The ninth edition took place from May 13 to 16, 2008 in Hamburg ( http://www.cfb9.org )....
Software
(non-exhaustive list)
The most commonly used calculation programs are :
ERGUN for the design of circulating fluidized beds ( http://www.utc.fr/ergun ).
CFBCAD for the design of circulating fluidized bed boilers ( http://www.greenfieldresearch.ca...
The Ultimate Scientific and Technical Reference
