Channel: Furnace technology
S.I.G.M.A.: Regenerator Chamber Refractories

2010-11-01 | Furnace technology

The choice of material for furnaces is a fundamental aspect of glass melting and must take into consideration a series of functions and the same furnace environment. In this article, S.I.G.MA. leads us through the different zones of regenerator chambers, taking into consideration the main operative factors, providing the suitable material to be used at each and every stage.

S.I.G.M.A.: Regenerator Chamber Refractories
Refractory selection for glass furnace regenerator chambers must recognize both the functions of the refractories and the operating environment within the chambers. In particular, checkers and internal separation walls function as heat exchangers, while crowns and external walls limit thermal losses. The main operating factors to be considered are temperature, repeated temperature cycling, airborne particulates, volatiles and load. Fuel and glass composition must also be considered when deriving the refractory specifications.
We will analyze regenerator chambers in a soda-lime glass furnace natural gas fired in the following zones:
- Checkers;
- Riders arches;
- Crowns;
- External walls;
- Target walls;
- Chamber separation walls.

As heat exchangers, checkers must have high thermal capcity and conductivity and from this point of view basic materials and fused cast refratories are the best solution.
However, refractory selection also depends on the operating conditions, which will be markedly different at the checker top when compared to the bearer arch level. Average temperature, particulate build up and condensation of volatiles will all be dependent on position within the chamber. Let us consider in detail checker behaviour in four zones:
• Top zone: from the first row to 1,350°C;
• Mid zone: from 1,350°C to 1,000°C;
• Condensation zone: from 1,000°C to 700°C;
• Lower zone: from 700°C to rider arches.

Basic refractories
High temperature combined w...


Article taken from Glass Machinery Plants & Accessories bi-monthly magazine (6 issues per year)
Year: 2010 number: 6
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