Which kind of refractory brick should be used for the regenerator of the glass furnace?
For the regenerator of a glass furnace, similar to a glass kiln, you would typically use special refractory bricks known as "regenerator bricks" or "checker bricks." These bricks are specifically designed to endure the extreme conditions of the regenerative process in a glass furnace.
1) Regenerator crown and side wall
The inner surface of the regenerator and the side wall are eroded by high temperature, dust and alkali vapor. From top to bottom, the degree of erosion gradually weakens. It is determined by the temperature and the degree of erosion. Silica bricks are generally used for the top and side walls, and low-porosity clay bricks and high-alumina bricks are generally recommended for the middle side walls; ordinary clay bricks and low-porosity clay bricks are generally used for the lower part of the kiln. Depending on the design, in recent years, the upper part of the side wall generally adopts ordinary magnesia-chrome bricks and directly combined magnesia-chrome bricks, and alkaline bricks such as magnesia-alumina bricks have also achieved good results.
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2) Checker
Because all the bricks of the checker body are under the action of high temperature load, dust and alkali vapor, the degree of erosion will be more severe than that of the side wall, so the service conditions are more severe. The blockage and collapse of the checker body is often one of the important reasons for the shutdown and cold repair of the glass kiln. Therefore, the checker refractory material is required to have high physical strength, low creep rate, strong defense ability against alkali erosion due to changes in kiln temperature and atmosphere, no dust adhesion, and slow damage speed.
On the top of the checker body: the temperature is high, which can reach 1400-1540 ° C, and it is also severely eroded by alkali steam and dust. Generally, fused and rebonded magnesia bricks are used. Because the silicate in the fused rebonded magnesia brick is relatively small, the periclase crystal has grown up, and the periclase has formed a direct bond, which delays and stops the gradual increase of the periclase crystal under the action of alkali steam. , It is not easy to crack and pulverize the bricks.
The upper part of the checker body: the temperature here can reach 1100-1430 ℃, and it is generally enough to use 95# combined with magnesia bricks.
The middle part of the checker body: the temperature is 800-1100 °C, and the alkali metal sulfate condenses in the range of 800-1100 °C. The magnesium and calcium checker bodies are severely eroded by SO3 and Na2O and undergo chemical reactions, which will lead to larger bricks The body expands and is seriously damaged, so this part is not suitable for using magnesia bricks, but magnesia-aluminum spinel bricks or directly combined with magnesia-chrome bricks or magnesia-zirconia bricks and magnesia olivine bricks.
The lower part of the checker body: this section has low operating temperature, heavy load, and little erosion by alkali, but it is relatively close to the flue and directly affected by cold air. The required materials should be able to withstand rapid cooling and rapid heating, and the price should be low. Therefore, low-porosity clay bricks with relatively low prices are generally used.
Ultimately, the choice of refractory brick for the regenerator of a glass furnace should be based on factors such as the furnace's design, the type of glass being produced, the temperature range, and the chemical environment. Consulting with refractory experts or engineers experienced in glass furnace design and operation is essential to ensure the right selection of refractory materials for optimal performance and longevity of the regenerator.
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