Method of removing oxides of nitrogen from flue gas

US4735785A · kind A · utility

Assignee

• STEAG GmbH · DE

Inventors

• Hans A. Eichholtz · Recklinghausen, DE
• Helmut Weiler · Velbert, DE

Key dates

• Filing date: Feb 5, 1987
• Grant date: Apr 5, 1988
• Expiry date: Feb 5, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/8625
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A flue gas stream having passed a flue gas desulfurization plant 2 enters a reactor 6 flowing through an activated carbon bed. The flue gas entering the reactor continuously is discontinuously blended with ammonia, thereby achieving a low ammonia content of the flue gas leaving the reactor, while maintaining a high efficiency of nitrogen oxide removal. The duration of ammonia addition and the rate of flow at which ammonia is added to the flue gas stream are controlled as a function of the desired efficiency of nitrogen oxide removal and the ammonia concentration measured in the reactor.