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Experimental study of residence time, particle movement and bed depth profile in rotary kilns
Author(s) -
Lebas E.,
Hanrot F.,
Ablitzer D.,
Houzelot J.L.
Publication year - 1995
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450730202
Subject(s) - residence time distribution , residence time (fluid dynamics) , kiln , mechanics , rotary kiln , residence , fraction (chemistry) , particle (ecology) , environmental science , geology , flow (mathematics) , materials science , geotechnical engineering , chemistry , metallurgy , physics , chromatography , demography , oceanography , sociology
Experiments were performed in a pilot scale rotary kiln with coal and coke particles to study their mean residence time, residence time distribution, bed depth profile and time spent at the bed surface. The influence of filling ratio on residence time was studied with a uniform bed depth in the kiln. Residence time distribution and bed depth profile measurements were performed in a kiln without end constriction, at different rotational speeds and different solid inputs. The residence time fraction corresponding to the passage of the particles at the bed surface was measured with a photographic study of the movement of a coloured particle. Various equations were tested to represent the experimental results. The equations of Kramers and Croockewit (1952) and Ronco (1965) were adequate to calculate mean residence times, while only the former could represent correctly the bed depth profile. An equation is proposed which turns out to be quite accurate in predicting the fraction of the residence time spent in the upper layer of the bed.