Method for calcination of a material with low nochi emissions

US8137099B2 · kind B2 · utility

Assignee

• L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude · FR

Inventors

• Erwin Penfornis · Oak Park, US
• Maguelonne Hammel · Cournon-d'Auvergne, FR
• Pascal Duperray · Montigny-le-Bretonneux, FR
• Xavier Paubel · Montigny-le-Bretonneux, FR

Key dates

• Filing date: Aug 2, 2006
• Grant date: Mar 20, 2012
• Expiry date: Nov 10, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E20/34
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for calcination of a material in which said material is heated by contact with a heat source essentially generated by means of a flame produced with at least one flow of fuel and primary air and a flow of secondary air, the flame comprising a first combustion zone with a temperature below 1500° C. and a second combustion zone with a temperature above 1500° C., where at least one flow of at least one inert gas is injected into the flame at the beginning of the second combustion zone and/or at least one flow of oxygen or a gas enriched in oxygen is injected into the second combustion zone.