Selection of Refractory Materials for Glass Melting Furnace

In the glass melting furnace, the flame generated by the combustion of fuel flows in a turbulent flow, which is strong and strong and has a certain scouring effect on the lining of the Refractory Materials for Glass Melting Furnace. The maximum temperature of the flame is 1500~1600℃, and it changes with time. Especially during commutation, the temperature fluctuates greatly, from tens of degrees Celsius to more than 100 degrees Celsius. The flame is also mixed with material dust, alkali vapor, boron vapor, lead vapor, and carbon particles. Space refractory materials masonry in the glass melting furnace also bears a certain mechanical load at high temperatures. The glass kiln brick body in contact with the flame space includes the kiln roof, breast wall, and port parts.

Refractory Materials for Glass Melting Furnace
Refractory Materials for Glass Melting Furnace

The following describes the damage characteristics of each part and the refractory materials used.

(1) Refractory Brick for Glass Kiln Roof and Breast Wall

The damage characteristics of this part of the refractory brick body are erosion and burning. The erosion is mainly caused by the aggregation of alkaline sulfate, which forming a honeycomb-shaped erosion. Therefore, it is necessary to use refractory materials that are extremely stable to alkali vapor at high temperatures, and have a high load softening temperature and creep resistance. High-quality silicon bricks are used for the main arch in the flame space of the glass furnace, and high-quality silicon mortar is used as supporting material.

In recent years, the 33# fused zirconium corundum brick used in the breast wall of the melting part has good thermal shock resistance when the temperature is above 1200 ℃. At the same time, it has good corrosion resistance to alkaline vapor and the particulate dust in the batch.

Kiln pressure has a certain effect on the use of refractory brick linings in contact with flames. When the kiln pressure is too high, the flame will increase the scouring of the refractory bricks, especially the brick joints. The brick joint is the weakest part of the entire refractory brick lining and is generally slowly eroded along the brick joint. Therefore, in the construction of refractory materials, while choosing materials with good performance effects, it is also necessary to select refractory mortar with excellent performance and minimize the width of the brick joints to improve airtightness.

(2) Refractory Brick for Front Wall

The front wall is a relatively weak part of the glass furnace kiln. There are three main types of damages, erosion of batch materials, thermal shock, and flame erosion. At present, 33# fused AZS bricks or sintered AZS bricks are mainly used in this part, and some high-quality silica bricks and sintered AZS bricks are also used in combination. In addition to the use of high-quality refractory bricks in the front wall, air cooling is also required.

Refractory Materials for Glass Melting Furnace Port
Refractory Materials for Glass Melting Furnace Port

(3) Working Environment of the Port

The port is a device that preheats and mixes fuel and air, and then to burning. The structure of the port should ensure that the flame has a certain length, has a large enough coverage area, and can adhere to the glass liquid surface without fluttering and delamination, and must meet the temperature and atmosphere requirements in the glass kiln. The structure of the small furnace varies slightly with the type of fuel.

Working Conditions of the Main Part of the Port

Application Parts Conditions of Use Temperature (℃)
jack arch of the port, Scattering of powder, melting downflow from the top of the main arch and temperature change at high temperature 1500 ~ 1600
skew arch of the port, bottom, and sidewall Powder scattering, high-temperature changes 1500 ~ 1600

Selection of refractories for the port of glass melting furnaces

The port parts of the glass melting furnace include Flat jack arch of the port, nozzle brick, skew arch of the port, straight grate, sidewall, bottom, and so on. And the grate, sidewalls, and bottom of the port entrance connected to the regenerator.

Among them, in addition to the nozzle brick and the furnace bottom, the 33# Fused cast zirconium corundum brick cast without shrinkage by the oxidation method is used. 33# Fused cast zirconium corundum brick cast by oxidation method can be used everywhere else.

For the thermal insulation of the straight and skew arch of ports, zirconium sealants, high-alumina insulation bricks, and high-alumina plastic insulation materials can be used. The insulation of the sidewall of the port can be made of zirconium sealant and high-aluminum insulation brick or non-asbestos calcium silicate board.

Under the refractory bricks at the bottom of the port, zircon bricks, fire clay insulation bricks and ceramic fiberboard can be used for heat preservation.

RS Refractory Materials for Glass Melting Furnace Supplier

For more information about refractory bricks for glass kilns, and the Selection of Refractory Materials for Glass Melting Furnace, please contact Rongsheng refractory brick suppliers. We will provide you with the most efficient service in the shortest time.

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