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How to Select Incinerator Lining Refractory Material
The choice of furnace lining materials is based on the selection of refractory materials and heat insulation materials that can withstand the incineration temperature according to the temperature of the furnace. Secondly, the corrosion of the furnace lining must be considered. For example, when the alkaline waste liquid is incinerated, the temperature in the furnace is as high as 1000 ° C, sodium oxide-like gas is emitted, and the sio2 component in the refractory brick is combined with Nao to form a low-melting mineral (Na2o.Al203.2sio2), which is condensed on the refractory brick surface And erosion. If the refractory brick is a high alumina brick, although the sio2 component is small, due to the reaction of Al2o3 and Na2o to form an intermediate sodium aluminate (Na2o and Al2o3), under high temperature conditions, expansion cracks will occur, making the structure of the refractory brick brittle. Therefore, high-aluminum refractories containing higher alumina, or chrome-magnesium, magnesium, and aluminum-magnesium refractories with better resistance to alkaline corrosion are selected. In order to resist the penetration and erosion of media such as saline and alkali, and to improve the slag resistance of materials, materials with lower porosity are generally selected.
When selecting the lining material of the incinerator, attention should be paid to the temperature and corrosion of different parts in the furnace, and different materials can be selected.
The maximum temperature of the combustion chamber is 1400 ~ 1600 ℃. Corundum bricks containing Al2o3 = 90% can be selected. The working temperature of the upper part of the furnace is 900 ~ 1000 ° C. The waste liquid nozzle is provided in the cone. High aluminum bricks containing Al2o3> 75% can be selected. The working temperature in the middle of the furnace is 900 ° C. There is molten salt and alkali flowing down the furnace lining, which is severely corroded. A high-grade aluminum brick (LZ-65) can be used. When a large amount of molten salt and alkali, it is easy to accumulate on the slope, has a long residence time, and easily penetrates into the refractory material. If Na2o3 is present, the corrosion is more serious, so it is worse than the middle of the furnace. Fused refractory products.
