Method for renovating ring chamber furnaces

US4944672A · kind A · utility

Assignee

• NORSK HYDRO ASA · NO

Inventors

• Hogne Linga · Sogndal, NO
• Carlo Eliassen · Årdalstangen, NO

Key dates

• Filing date: Feb 8, 1989
• Grant date: Jul 31, 1990
• Expiry date: Feb 8, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27D2001/005
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A method for the renovation of a ring section furnace having several sections connected in series, each section comprising a plurality of parallel pits. A complete renovation/maintenance of the furnace is accomplished according to a continuous program where one or more, preferably three sections at a time and when needed, are torn down and rebuilt while the remaining sections are still in operation. During normal operation, several adjacent sections are undergoing a firing cycle and constitute a firing zone. The furnace is normally operated with a plurality of firing zones separated by inactive adjacent sections having the work material removed from or placed therein. In the present method, the firing cycles of less than all of the firing zones are altered until the minimum number of inactive sections separates at least two of the firing zones. This results in an increase in the inactive sections at another point. Revonvation/maintenance is carried out in the increased inactive sections prior to arrival of the next firing zone. The firing cycles are then altered to achieve the normal firing zone spacing.