Method and apparatus for thermal treatment of mealy raw materials
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United States of America Patent
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Feb 25, 2003
Grant Date -
Nov 8, 2001
app pub date -
Feb 22, 2001
filing date -
Nov 25, 1998
priority date (Note) -
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Abstract
In order to create, for cement clinker production lines, a calcinator that is connected upstream from the rotary tubular kiln and is equipped with two firings, which enables on the one hand a high-grade calcinated raw meal and on the other hand an exhaust gas with very low NO.sub.x emissions, as well as a burning that is as complete as possible of remaining CO-containing NO.sub.x reduction zones, it is provided that a combustion point with sub-stoichiometric fuel combustion be arranged both in the rotary kiln exhaust gas ascending line and also in the cooler outgoing air line which form a first and section portion, respectively, of the calcinator and that downstream in a flow direction of the suspension, additional combustion air discharges into the calcinator which combustion air is branched off from the tertiary air line coming from the clinker cooler via at least one branch line.
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