Method and device for the catalytic reduction of nitrogen oxides contained in the off-gas from a combustion system

US6442932B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Lothar Hofmann · Burgkunstadt, DE
• Gunther Pajonk · Zapfendorf, DE
• Manfred Weigl · Viehhausen, DE
• Gerhard Wissler · Geiselhöring, DE

Key dates

• Filing date: Oct 24, 2000
• Grant date: Sep 3, 2002
• Expiry date: Oct 24, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

To ensure the maximum possible conversion of nitrogen oxides in a DeNOx catalytic converter in an off-gas cleaning installation for reducing nitrogen oxides and, at the same time, to prevent the reducing agent which is used for the reduction from escaping into the environment, there is provision for the density of a reducing agent solution to be used to determine the volume of the reducing agent solution which is to be metered. The density is regulated in two ways, in that the temperature of the reducing agent solution is measured using a temperature sensor and set by a temperature-control device.