| 摘要 |
The invention relates to the crown of a glass melting furnace built of tapered silica bricks, having a hermetic sealing layer above the brickwork, preventing the leakage of hot gases, fumes and agressive vapours. This hermetic sealing layer, according to the invention, comprises one or several layers of flat or profiled silica bricks, bonded between themselves and with the crown with a refractory silicate glue, being compatible with the silica bricks. The refractory silicate glue is having a strong and durable adhesive bond with the silica bricks up to 1600 oC, and a coefficient of expansion equal or very close to the coefficient of the silica bricks. This invention will find application for reducing or eliminating the condensation corrosion in the silica crowns, by reducing the chances of "rat hole" formation in the loose joints between the silica bricks of the crown. It will prolong the service life of furnaces melting soda-lime, borosilicate, lead and sodium-silicate glasses. It will be especially suitable for solving the "rat-hole" corrosion problems in oxy-fuel fired glass furnace silica crowns. The invention will also find wide application for hot repair of "rat-holes" of heavily corroded old glass furnaces, by elimination of the corrosion problems and prolonging of the service life. |
