Apparatus for thermal processing of raw material in meal form
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United States of America Patent
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Oct 22, 2002
Grant Date -
Feb 21, 2002
app pub date -
Jun 18, 2001
filing date -
Jun 21, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Cement clinker production apparatus having a precalcination stage connected upstream of a rotary kiln, in which precalcination stage a CO-containing reduction zone in the rotary kiln off-gas duct is employed for the purpose of reducing the pollutant NO.sub.x. In order to make certain that the quantitative ratio of O.sub.2 in the rotary kiln off-gas to fuel admitted by a deNO.sub.x burner, and thus control the effectiveness of NO.sub.x reduction, a pivoting throttle valve (33) is positioned in the precalcination stage to control the quantity of rotary kiln off-gas and thus the O.sub.2 content in the kiln off-gas. The throttle valve (33) is positioned in the rotary kiln off-gas duct (15) above the deNO.sub.x burner (19), above the raw meal inlet (13), and before the confluence of the tertiary air substream with the rotary kiln off gas. The throttle valve (33) is pivotable about an articulation (34) at the bottom side of the valve so that the flow of the rotary kiln off-gas remains laminar, thus enhancing the reaction length of the CO-containing reduction zone (23).
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