Process of removing the ash from the gas produced by the combustion of coal

US4903617A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Ekkehard Weber · Essen, DE
• Reinhard Schulz · Hannover, DE

Key dates

• Filing date: Dec 7, 1988
• Grant date: Feb 27, 1990
• Expiry date: Dec 7, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2239/1208
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Described is a process in which the liquid ash is removed from a combustion gas which is produced by a combustion of coal with air under a pressure between 2 to 30 bars, wherein the combustion gas at a temperature between 1200.degree. and 1700.degree. C. is passed through at least one porous gas-permeable filter element which is disposed in the combustion chamber. The combustion is effected with a C:O.sub.2 mole ratio of 1:0.6 to 1:0.99 and the filter element consists of carbon; carbides of boron, silicon, titanium, zirconium or hafnium; nitrides of boron, silicon, titanium, zirconium or hafnium; borides of titanium, zirconium or hafnium; and/or oxides of aluminum, silicon, magnesium or zirconium.