Why the lining of Incinerator should use the zirconium corundum mullite bricks?

Why the lining of Incinerator should use the zirconium corundum mullite bricks?

When the waste liquid spray atomization is normal, the erosion peeling of the incinerator liner is mainly due to the reaction of the partially incompletely burned waste liquid and waste liquid combustion products with the wall lining, resulting in a meeting on the lining surface of the furnace. The compound that causes damage causes the liner to crack, and the reacted chemicals are easily peeled off from the liner surface, so that the cracked portion of the liner is removed, the furnace liner gradually becomes thinner, and the upper inclined section and the middle straight section The 1/4 part of the section is the main reaction zone for mixing. It is the place where the atomized waste liquid and combustion products accumulate in the furnace wall. The contact reaction is the most serious. Therefore, the erosion and stripping is the most serious. When the waste liquid spray atomization is abnormal, Most of the waste liquid is sprayed directly onto the lining of the furnace, so that the local lining temperature of the scoured is drastically reduced, and a temperature difference is formed with the surrounding lining of the furnace, thereby generating internal stress. When the internal stress exceeds the lining strength of the furnace, That is, cracks are generated. With the passage of time, the cracks continue to expand and fracture, causing the furnace lining to continuously peel off and thin. The upper 1/4 section of the upper inclined section and the middle straight section is the part where the erosion and erosion directly contact most. Erosion stripping is the most serious. For this reason, we must use refractory materials with good corrosion resistance, high thermal shock resistance, and high temperature and volume stability as lining refractories for incinerators.
1. Selection of lining refractories
Combining the lining of the incinerator on the upper quarter of the upper inclined section and the middle straight section is most likely to be damaged, and the most serious damage is caused. Considering the physical and chemical properties and economic cost of the material, we use zirconium corundum mullite brick. , heavy high-alumina bricks and high-alumina light-weight heat-insulating bricks and corresponding refractory refractory materials, in the incinerator 7050mm (2/3 of the straight section in the middle, with the bottom of the residual reaction area as the base surface) Laminated zirconia corundum mullite brick, 0-7050mm lining surface is built of heavy high-alumina bricks, and the entire incinerator is lined with intermediate layers to build high-alumina lightweight insulating bricks.

2.The specification of

Zirconium corundum mullite brick contains ZrO2, heavy high-alumina brick does not contain ZrO2, zirconium corundum mullite bricks at room temperature compressive strength, 0.2MP load softening temperature high specific gravity high alumina bricks, indicating zirconium corundum mullite brick The ability to resist deformation under the action of temperature and load at the same time is higher in proportion to high quality aluminum bricks and corrosion resistance than in high quality aluminum bricks; the rate of change in reburning lines of zirconia alumina mullite bricks (1500×3h) is higher in proportion to high quality alumina bricks. The small, the zirconia corundum mullite brick under the effect of high temperature profile and volume stability without permanent deformation of the performance of the proportion of high quality aluminum brick is good, that is, zirconium corundum mullite brick high temperature volume stability is better. High temperature volume stability, can ensure the stability of masonry, to avoid cracking masonry, resulting in equipment damage.