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Oxygen enrichment in rotary lime kilns
Author(s) -
Watkinson A. P.,
Brimacombe J. K.
Publication year - 1983
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.5450610611
Subject(s) - kiln , calcination , rotary kiln , combustion , oxygen , volumetric flow rate , waste management , limiting oxygen concentration , lime , environmental science , materials science , chemistry , mineralogy , thermodynamics , metallurgy , engineering , catalysis , biochemistry , physics , organic chemistry
The operation of a pilot‐scale rotary lime kiln, fired with natural gas, was studied to determine the effects of enriching the combustion air with oxygen. The variables of interest were the temperature, calcination and heat flow patterns within the kiln as functions of the fuel rate, oxgyen concentration and limestone feed rate. All tests were conducted with essentially a stoichiometric fuel/oxygen ratio and employed two different limestones. Data are presented to show the increase in kiln throughput that can be achieved using oxygen enrichment. The results are interpreted using detailed measurements of axial solids, gas and wall temperatures and axial calcination profiles. These permit the evaluation of the driving forces for the various heat exchange processes, and of local heat flow to the solids bed.