Method and apparatus for injecting air into long cement kilns
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United States of America Patent
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May 27, 1997
Grant Date -
N/A
app pub date -
Nov 28, 1994
filing date -
Nov 28, 1994
priority date (Note) -
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Abstract
A method and improved apparatus is disclosed for improving combustion efficiency and reducing emission of gaseous pollutants during the manufacture of cement in conventional long rotary kilns. Air is injected through a port in the wall of a rotary cement kiln having a secondary burning zone established by burning solid fuel in contact with the in process mineral at a point downstream, relative to kiln gas flow of the clinkering zone in the kiln. The air injection apparatus is designed to enhance mixing of the injected air with the kiln gas stream and is characterized by high linear flow rates and/or multi-directional air injection ports. The air injection ports can be located downstream of a secondary burning zone to provide staged combustion with concomitant reduction in concentration of NO.sub.x, CO and hydrocarbons in the kiln gas stream.
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