Energy Recovery Of A Rotary Kiln System In A
Calcium Oxide Plant
Author(s)
M. Aldeib, A. Elalem & S. Elgezawi
Abstract
The dominant source of calcium carbonate is limestone; the most common
constituent of all rocks. It occurs in nature with clay, silica and other minerals,
which may interfere in many applications. Synthetic calcium carbonate is
produced on a large scale where a calcium chloride stream is treated with sodium
or ammonium carbonate to produce a high grade of calcium carbonate. In turn,
calcium carbonate is heated to 900–1000 degree centigrade in a horizontal lime
kiln to produce calcium oxide (burned lime). Calcium oxide is used extensively
in cement, iron and steel industries due to the low cost of the material and its
accepted chemical properties. In this study, composition of raw meal, ultimate
analysis of the fuel, dust contents in the exhaust gases, losses in ignation (COI)
and exhaust gas composition in the preheated suspension are calculated. The heat
losses from kiln exhaust are minimized. A secondary shell on the kiln surface is
also investigated. In this work mathematical models for the calculations of inside
heat transfer on the rotary are used, and the total energy utilized by burning fuel
oil in the process of calcium oxide production is also calculated. The heat losses
for kiln exhaust gas, hot air from the cooler stock losses and radiation losses
from kiln surface are also minimized. A secondary shell on the kiln surface is
studied in the present study, where 4% of total energy input is saved. This energy
saving would result in a considerable reduction of fuel consumption in the kiln
system. The overall efficiency would be improved by 5%.
Keywords: rotary kiln reactor, radiant heat transfer, coating, combustion.
Keywords
rotary kiln reactor, radiant heat transfer, coating, combustion
Related Book
Other papers in this volume
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