Low temperature urea-Scr operation in the presence of high sulphur flue gas

US9782721B2 · kind B2 · utility

Assignee

• Johnson Matthey Public Limited Company · GB

Inventors

• Rodney Foo · Nivelles, BE
• Rainer Leppelt · Lichtenfels, DE
• Joerg Werner Muench · Burgkunstadt, DE
• Ralf Dotzel · Burgkunstadt, DE
• Maria Brandmair · Unterschleißheim, DE

Key dates

• Filing date: Jan 29, 2016
• Grant date: Oct 10, 2017
• Expiry date: Jan 29, 2036

Classification

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

Abstract

Systems and methods of continuous operation of a urea-SCR system at low temperatures (200-350° C.) in the presence of high SOx containing flue gas are described. The methods comprise introducing a solution of urea and an NO2 forming compound, preferably an alkaline earth metal nitrate, into an exhaust stream before the exhaust stream contacts an SCR catalyst.