Glass Furnace

glass furnace

[′glas ‚fər·nəs]
A large, covered furnace or tank for melting large batches of glass, in which heat is supplied by a flame playing over the glass surface, and regenerative heating of combustion air and gas is usually employed. Also known as glass tank.

Glass Furnace


a furnace designed to melt glass and provide the preparation for forming. Upon heating in a glass furnace, usually to 1500°-1600°C, the charge (raw materials) passes through the stages of silicate formation, mutual solution of silicates and residual silica, and fining (removal of gas bubbles). It is then converted into a glassy mass suitable for the forming of articles.

Glass furnaces of the batch type include pot furnaces and small tank furnaces. They are used for the production of such special glasses as optical glass, colored glass, crystal glass, and the glass used in illuminating engineering, the treatment of which is carried out primarily by hand. Pot furnaces usually contain six to eight pots, which are refractory vessels made of grog, kaolin, or quartz and which hold 100–1,000 kg of molten glass; less often, the furnace may have 12 to 16 pots, for example, when a casting process is used. Operation involves heating the furnace, filling the pots with raw material and scrap glass, and melting the charge. The glass is then subjected to forming, and the process is repeated. Although pot furnaces have an efficiency of only about 8 percent, they permit the simultaneous melting of glass with different compositions. Also, since mixing is comparatively easy in the pots, the homogeneity necessary in producing, for example, optical glass, can be readily achieved. Batch-type tank furnaces, used primarily in the production of hard glass and colored glass, are more economical.

In the large-scale production of glass (sheet glass, container glass), melting is carried out in continuous tank furnaces, and forming is done by machine. In continuous furnaces, melting occurs in certain sections, and the molten glass then moves the length of the furnace. The melting section also includes zones for fining and homogenization, and the forming section also includes a zone for cooling. The design of tank furnaces may differ in the path followed by the flame (transverse path, horseshoe-shaped path), the method of separating the melting and forming sections in the glass melt (floating grog pieces), and the method of dividing the space under the crown of the furnace occupied by gas (using a screen, lowering the roof). For example, in the production of sheet glass, continuous tank furnaces are used in which the flame is directed transversely. The length of the tank may reach 60 m, the width 10 m, and the depth 1.5 m. The tank can hold up to 2,500 tons of molten glass. Continuous tank furnaces have a melting capacity of up to 300 tons per day. They are made of refractory materials.


Ginzburg, D. B. Steklovarennyepechi. Moscow, 1967.


References in classic literature ?
And you must know besides, that the true knight-errant, though he may see ten giants, that not only touch the clouds with their heads but pierce them, and that go, each of them, on two tall towers by way of legs, and whose arms are like the masts of mighty ships, and each eye like a great mill-wheel, and glowing brighter than a glass furnace, must not on any account be dismayed by them.
SGGI UK seek a supplier to design, build and install a waste heat recovery system utilising an Organic Rankine Cycle (ORC) system on a glass furnace in its factory in Eggborough, North Yorkshire.
In one example, an investment in a new glass furnace reduced natural gas consumption by 65 per cent and in the other example waste heat is used to generate 25 per cent of the electricity needs of a large industrial company.
Good progress was made in pursuit of greenfield glass furnace growth opportunities in Ethiopia and Nigeria, reports De Ruyter.
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Supply and erection of precision furnaces and laboratory instruments for handling fine arts including electric porcelain furnace and electric glass furnace for experiments, other special melting furnaces, different mixers for shale and glaze, a paint cabin for glaze, a thermal shelve and a special purpose stand.
Individual papers include discussions on energy efficiency improvements in the glass product and production chain, modern glass furnace regenerators, burner optimization in oxygen gas-fired glass furnaces, low cost fused glass refractories, and more.
7) performed with the vesicles taken from the hot glass furnace working at about 1500[degrees]C, the yellowish-green and the bluish-green pigments produced keep their phosphorescent characteristic even after their usage at high temperatures.
com)-- Paragon Industries, the kiln factory in Mesquite, Texas, has released the Trifecta crucible glass furnace.
A bulk sample trial of the product carried out in 2007 with a fibreglass producer successfully proved its utility in this application with added benefits of reduced energy consumption in the glass furnace.
Saudi Advanced Industries Company (SAIC) said its glass manufacturing subsidiary, Obeikan Glass Company, had begun the operation of its glass furnace.
Topics of the 21 papers include modeling the quality of glass melting processes, the operational experience of an oxy-fuel fired glass melter using an improved silica crown and wide flame burners, measuring particle size in the flue gas of glass melting furnaces, requirements of glass compositions for solar applications, model-based predictive control to increase the efficiency of glass production and energy, calculating and measuring temperature distributions in glass gobs between shears and blank mold, postmortem of a conventional silica brick from a soda-lime float glass furnace crown, and refractory solutions for extra white glasses.