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Refractory Material Matching Scheme for Glass Kiln Lattice Body and Regenera
1. The Refractory Material and Matching of the Lattice Body
The material and matching of the lattice body have a direct impact on its service life, heat storage capacity, energy saving effect and economic rationality. Here are several more successful typical lattice body configuration schemes:
Mainly based on alkaline refractory materials, high-purity magnesia bricks and directly bonded magnesia chrome bricks.
In this scheme, low-porosity clay brick ZGN-42 is generally used for the lower layer of the lattice body, direct-bonded magnesia chrome brick DMC-12 is used for the middle part, 95 high-purity magnesia bricks are used for the upper high temperature zone, and 97 high-purity magnesia bricks or sintered AZS bricks are used for the top layer. According to the use experience of the float furnace of d in the past ten years, under normal use, the life of this configuration scheme can reach more than 8 to 10 years. However, the problem of partial blockage and collapse occurred during use, and it needs to be passed through. The slag was treated with nodules, but the checker bricks were not replaced.
The primary manifestation of the problems with this scheme is that the high-purity magnesia bricks crack at high temperatures, which some people call "silicate explosion" or "walnut cakes", and there are nodules and blockages in the central lattice body, which leads to the damage of the lattice bricks. Related to magnesia bricks The damage mechanism is generally considered to be corroded by SiO2, V2O5 and CaO in the high temperature zone.
1.2 Partial use of magnesia-zirconium bricks in the above scheme
The top layer of the lattice body is susceptible to the erosion of dust and V2O5 in the heavy oil, and the high-purity magnesia bricks are easy to be damaged. Use high-grade magnesia-zirconium bricks that do not contain CaO or their content is very low. , V2O5 erosion, forsterite phase has been formed, the load softening temperature and high-temperature volume stability are better than high-purity magnesia bricks, and the price is lower than AZS products, so this part can use high-grade magnesia-zirconium bricks. Practice has proved that the effect is very good.
The use of magnesia-zirconium bricks only on the top layer can only partially improve, but the overall life of the grid body does not have much impact. A more reasonable solution is to use ceramic-bonded high-temperature sintered high-purity magnesia bricks in the high-temperature zone except the top layer, and high-quality magnesia-zirconium bricks in the central condensation zone Bricks replace chromium-containing direct-bonded magnesia-chromium bricks, which can not only improve the use effect, but also reduce the pollution of chromium to water sources. The magnesia-zirconia bricks are made of MgO and ZrSiO4 sintered, and the matrix is anti-corrosion phase. Mg2SiO4 and ZrO2 are in the magnesia A protective layer is formed on the surface of the stone to prevent it from being corroded. The magnesia-zirconium brick is not infiltrated by sulfate during use. The sulfate does not stick in the condensation zone and does not block the grid holes. A certain 500t/d with this configuration scheme After the float glass kiln has been used continuously for 13 years, only the top checker bricks have been corroded and damaged, and the lower checker bricks are intact and are still in use. This kiln checker brick is an imported strip brick.
1.3 Use Cross-Shaped Fused Checker Bricks
Cross-shaped fused checker bricks are seldom used in domestic float kilns because of their high price, although their service life and heat storage effect are very good.
1.4 Using a new type of ultra-low porosity clay cross-shaped checker brick
In a 250t/d ultra-white calendering kiln, the configuration scheme of super clay + sintered AZS cross checker brick is used. The effect is very good from the use of kilns in other industries. The service life can be more than 8 years. It has good stability, slightly expands at 1100°C, and slightly shrinks at around 1400°C.
1. Refractory Material and Matching of the Wall of the Regenerator
The refractory material and matching of the regenerator walls include end walls and partition walls. The lower wall uses low-porosity clay fire bricks and low creep high alumina bricks. There is basically no problem in using one kiln period. Most of the upper and middle float kilns will When using directly combined magnesia chrome bricks, two problems were found to be serious during use. One is the kiln period, around 200℃, and low temperature inflation, causing the wall to loose and crack. Fire affects production and requires hot repair; second, the wall collapses during operation, causing blockage and damage to the grid body, which has to be hot repaired and replaced, which seriously affects production and the age of the kiln, and the large-scale use of chromium-containing refractories will cause serious pollution Water resources.
The target wall of the regenerator can choose ordinary cast 33# fused zirconia corundum bricks, which are better in use than directly combined with magnesia chrome bricks, but after a long period of time, they will peel off and block the grid holes. There are two feasible solutions for the upper middle wall. , One is to use magnesia-zirconium bricks, but the quality of the bricks must be passed. Due to price issues, domestic manufacturers rarely use them; the other is to use super clay bricks for the middle wall and super clay bricks for the upper wall and sill or better composites. Corundum mullite bricks expand very little during the baking process and have almost no effect on the wall. The effect is very good and the price is acceptable.
In short, the material selection and matching of the regenerator is very important, which not only affects the age of the kiln, but also has a great influence on the production process. Reasonable material selection and matching will greatly extend the age of the kiln and create considerable economic value for the enterprise.
