Prefferential oxygen firing system for counter-current mineral calcining

US6077072A · kind A · utility

Assignees

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

Inventors

• Ovidiu Marin · Paris, FR
• Mahendra Joshi · Katy, US
• Olivier Charon · Chicago, US
• Jacques Dugue · Paris, FR

Key dates

• Filing date: Sep 18, 1998
• Grant date: Jun 20, 2000
• Expiry date: Sep 18, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27B2007/365
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

Superior heat transfer in a kiln is achieved by the use of at least one injector which injects both an oxidant, preferably containing oxygen, and a secondary fuel into the kiln. The injectors are provided so that the energy resulting from the combustion of the different fuels in the kiln heats specified regions of the kiln, without causing hot spots on the refractory walls. A firing scheme is described for the oxygen and fuels which allows an increase in the amount of heat released toward the load, resulting in significant increases in kiln efficiency and production. Low quality fuels may be used, as well as using and/or recycling more insufflated dust, without an adverse effect on the main flame.