Apparatus for removing nitric oxides from processing exhaust gases

US4087250A · kind A · utility

Assignee

• Didier Engineering GmbH · DE

Inventors

• Karl H. Laue
• Theo Sander · Essen, DE
• Peter Sauder · Essen, DE
• Gotthard Uckert

Key dates

• Filing date: Mar 19, 1976
• Grant date: May 2, 1978
• Expiry date: Mar 19, 1996

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/8631
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Exhaust gases containing residual nitric oxide constituents from a processing operation are maintained at an elevated pressure, heated to from 260.degree. C. to 340.degree. C. in a separate heat exchanger, and subjected to multi-stage catalytic reduction with ammonia to produce purified exhaust gases. The pressure of the thus purified exhaust gases is then relieved in an expansion turbine.