Exhaust gas purification system for denoxing exhaust gases from combustion units

US6301879A · kind A · utility

Assignee

• HJS Fahrezeutechnik GmbH & Co. KG · DE

Inventors

• Werner Weisweiler · Remchingen, DE
• Georg Huthwohl · Soest, DE
• Bernd Maurer · Balve, DE

Key dates

• Filing date: Feb 22, 2000
• Grant date: Oct 16, 2001
• Expiry date: Feb 22, 2020

Classification

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

Abstract

An exhaust gas purification system for denoxing exhaust gases has a converter containing a substance thermolytically separable into NH.sub.3, a feed line connecting the converter with an exhaust gas line for supplying NH.sub.3 into the exhaust gas flow therein, a dosing device in the feed line for dosing the NH.sub.3 to be introduced into the exhaust gas flow, a heatable cold-start store connected to the feed line between the converter and dosing device for providing the substance during starting of a combustion unit connected to the exhaust gas line, an air feeding device having two air conduits provided with valves wherein one conduit is connected to the feed line between the cold-start store and dosing device and the other conduit is connected to a mixing chamber located in the feed line after the dosing device, and a reservoir container for storing the substance connected to a filling pipe terminating in the converter.