Process and device for the catalytic cleaning of the exhaust gas from a combustion plant

US6444177B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Raimund Müller · Erlangen, DE
• Lothar Hofmann · Burgkunstadt, DE
• Kurt Schardt · Aichach, DE
• Wieland Mathes · Aichach, DE

Key dates

• Filing date: Dec 29, 1997
• Grant date: Sep 3, 2002
• Expiry date: Dec 29, 2017

Classification

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

Abstract

Exhaust gas to be cleaned is introduced into a conversion and mixing duct and the exhaust gas flows through the duct along a predetermined longitudinal direction. A reducing agent, such as aqueous urea solution, is injected into the exhaust gas stream in the conversion and mixing duct. The exhaust gas stream is then deflected into a reaction duct which extends parallel to or coaxially around the conversion and mixing duct. The exhaust gas then flows in the opposite direction through the reaction duct. A reduction catalyst is disposed in the reaction duct, where the reducible components of the exhaust gas are reduced. The exhaust gas cleaned in this manner is then discharged from the reaction duct.