Applications Of Refractory Material In Float Glass Furnaces

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Float glass furnaces are used to make flat toughened glass which is widely used
in the fields of architecture, decoration, furniture, electronic apparatus,
vehicles, ships, aviation, and more. Float glass furnaces consist of three main
parts, the melter, refiner and regenerators or checkers.

The Melter is a rectangular basin in which the actual melting and fining (seed
removal) takes place. In a side-fired furnace, the batch is charged into the
furnace through the doghouse, which is an extension of the melter, protruding
from the back wall. Along each side of the melter, above glass level, are three
to seven ports, which contain the natural gas burners and direct the combustion
air and exhaust gases.

In the melter zone, due to its high temperature and severe corrosion, fused cast
AZS block 41# and 36# are used in the sidewall, electrode block, bubbling block
and other glass contact areas. Fused cast alumina block and fused cast high
zirconia block are also use in the glass contact areas for special glass
furnaces.

The melter basin is separated from the refiner by the bridge wall (throat end
wall). Glass passes from the melter to the refiner through the throat, which is
a water-cooled tunnel that extends through the bridge wall. The throat is always
subjected to strong attack and severe corrosion, so fused cast AZS block 41# and
36# are used here.

The Refiner acts as a holding basin where the glass is allowed to cool to a
uniform temperature before entering the forehearths. The melter and refiner are
covered by crowns to contain the heat. In the refiner zone, the temperature is
lower and the wear and corrosion is not so severe, so fused cast AZS block 33#
is used here.

The regenerators consist of two chambers, each of which is filled with a network
of refractories, referred to as the packing. Regenerator chambers are normally
vertical constructions in which the waste gases pass downwards, whilst the
combustion air travels upwards. There are various forms of regenerator packing,
but only two are now widely used. Both designs utilise specially shaped blocks,
cross-shapes for the cruciform system, and square section tube shapes for the
chimney block system.

The top courses of regenerator checkerwork are subjected to high temperature and
severe attack and magnesia block is employed here. In the middle courses, as the
temperature is lower, magnesia block with lower content of MgO is used here. In
the lower courses, as the atmosphere is not quite severe, fireclay brick is
always used here as an economic choice.

Sunrise Refractory is a refractory supplier from China, specializing in all
types of refractory materials used in glass making. The main products are as
follows: fused cast AZS, mullite brick, zircon brick, alumina bubble brick,
sillimanite brick, corundum brick, fireclay brick, high alumina brick, ramming
masses, insulating materials, etc.

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