The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2002
Filed:
Jun. 18, 2001
Norbert Streit, Siegburg, DE;
Carsten Eckert, Cologne, DE;
Ralf Filges, Bergisch-Gladbach, DE;
Horst Schilling, Cologne, DE;
KHD Humboldt Wedag AG, Cologne, DE;
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 . In order to make certain that the quantitative ratio of O in the rotary kiln off-gas to fuel admitted by a deNO burner, and thus control the effectiveness of NO reduction, a pivoting throttle valve ( ) is positioned in the precalcination stage to control the quantity of rotary kiln off-gas and thus the O content in the kiln off-gas. The throttle valve ( ) is positioned in the rotary kiln off-gas duct ( ) above the deNO burner ( ), above the raw meal inlet ( ), and before the confluence of the tertiary air substream with the rotary kiln off gas. The throttle valve ( ) is pivotable about an articulation ( ) 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 ( ).