Method and apparatus for purification of exit gases from kiln installations

US5264013A · kind A · utility

Assignee

• Krupp Polysius AG · DE

Inventor

• Ludger Brentrup · Oelde, DE

Key dates

• Filing date: May 29, 1992
• Grant date: Nov 23, 1993
• Expiry date: May 29, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/64
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In this method and this apparatus exit gases to be purified from kiln installations are first of all dedusted in a first filter stage and then in at least one further filter stage they are purified of the NH.sub.x compounds and/or volatile pollutant elements and compounds with at least partial reduction of NO.sub.x with the aid of a carbonaceous filter medium. In order that the filter dust precipitated in the first filter stage can without problems either be re-used in a suitable manner of deposited in simple refuse dumps, the proportion of low-boiling pollutants and pollutant compounds in this precipitated filter dust is reduced by successive method steps in which the said pollutants are evaporated out of the filter dust, the quantities of dust are precipitated out of these vapors and the dedusted vapours are passed through a filter unit containing a carbonaceous filter medium.