ANH Refractories hot repair solutions and considerations in glass furnaces

2014-02-20 | Refractories

Glass melting furnaces need to efficiently produce high quality glass over a long period of time. This article discusses the various hot repair techniques used to extend the life of a glass melter while maintaining optimum product production.

ANH Refractories hot repair solutions and considerations in glass furnaces
Glassmakers have always been tasked with extending the life of furnaces for as long as possible, without affecting the glass quality. However, since the economic downturn which occurred in the past decade, some campaigns have really pushed the limits. Multiple hot repairs, often on the same section of the furnace, make this possible. For example, it is not uncommon to replace the overcoats on a sidewall of the melter multiple times over the life of a campaign. However, like an automobile, regular maintenance can extend the life, but there comes a point when maintenance is not economical anymore and a new one must be purchased.

Crown solutions
Hot repair refractory materials for a crown come in several varieties based on the hot face material composition, the glass melt composition and the extent of the repair. In the case of a silica crown, it is common practice to apply a seal layer on a new construction. Even though this is not really considered a repair, it is still installed hot due to the large thermal expansion of the silica crown upon heat up. The seal layer consists of a monolithic material that is very thermal shock resistant and will only set under high temperature conditions. It is important to wait until the crown has completely expanded during heat up to apply this layer to ensure the monolithic layer will not crack or form a gap between the seal layer and the hot face material. This same type of monolithic material can also be used later in campaign as an actual...


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Article taken from Glass Machinery Plants & Accessories bi-monthly magazine (6 issues per year)
Year: 2014 number: 1
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