Choking Affects the Operation Diagram of a CFB Riser | Zendy

H. L. Zhang | Zendy; Jan Degrève | Zendy; Jan Baeyens | Zendy; Raf Dewil | Zendy

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Choking Affects the Operation Diagram of a CFB Riser

Author(s) -

H. L. Zhang,

Jan Degrève,

Jan Baeyens,

Raf Dewil

Publication year - 2014

Publication title -

journal of powder technology

Language(s) - English

Resource type - Journals

eISSN - 2090-7710

pISSN - 2090-7737

DOI - 10.1155/2014/980416

Subject(s) - choking , diagram , range (aeronautics) , mechanics , wellbore , petroleum engineering , engineering , materials science , geology , physics , aerospace engineering , mathematics , statistics , anatomy , medicine

Experiments in 3 different CFB risers have confirmed that common riser operations can be hampered in a well-defined (U, G) range where choking occurs. Geldart A-type powders were investigated. Experimental results of the choking velocity were empirically correlated, being about 30% lower than predicted by the correlation of Bi and Fan, but largely exceeding other predictions. Introducing the findings into the operation diagram presented by Mahmoudi et al. adds a region where stable riser operation is impossible. The adapted diagram enables CFB designers to better delineate the operating characteristics.

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