The principle of the selection principle of lime kiln (vertical kiln) must first be resistant to alkali, good density and strong strength, and resistance to refractory bricks with strong degradation. Many lime kiln -resistant bricks users respond to bricks frequently.
One is the choice of refractory bricks, and the other is the masonry of the lime kiln stove. The ash seam of refractory fire bricks is a weak link after the stove wall mounts. When the furnace is built, the pore rate of the refractory brick masonry is large, the gaps of the bricks are large -alkaline metal oxide, and carbon analysis. Excessive development of the edge airflow during operation will cause the hot surface temperature of the furnace wall to be too high, creating conditions for the temperature effect, so that the bricks are peeled prematurely.
Alkaline metal oxides and the Mo Lai stone ingredients in the fire -resistant bricks also cause volume expansion. There are two sources of alkaline metal oxides, which come from fuel and the species from the fire resistance itself. These alkaline metal oxides and the SiO2 reaction in the refractory brick react to form a compound of low melting temperature, forming furnace tumors, causing damage to the lining. The Mo Lai Stone Three Aluminum Silicon (3AL2O3.2SIO2) in the alkaline metal oxide and the refractory fire brick reacts to form a potassium stones (K2O.AL2O3.2SIO2) White garnet (K2O.AL2O3.4SIO2), accompanied by 30%~ 50%of the volume expansion, and the melting temperature of potassium stones is about 1100 degrees Celsius, which seriously affects the refractory resistance of refractory materials. The consequence is to cause the furnace to peel off. The pouring of the Wei Ran Belt ensures the temperature caused by the temperature in the lower and upper part, and the steam temperature in the furnace pipe is improved. Research at the Research Department of Fire Resistance Materials: The destruction of alkaline metals is the main cause of damage to brick lining, and it accounts for about 40%of the damage. The removal and alkali removal of the raw materials for refractory materials is very important. It is simpler to remove iron, but it is more difficult to remove the alkali impurities K2O/NA2O/R2O. R2O is the abbreviation of the price of oxides. This alkaline metal oxide impurities grasp the raw materials.
Thermal stress destruction
The temperature of the working surface of the refractory brick is close to the temperature of the marginal gas flow, the temperature of the working surface is close to 1400, and the temperature of the refractory fire brick is low, and the temperature difference between the two is above 400 degrees. 40MPa, so you have to use high fire resistance materials with high thermal conductivity. The expansion of the thermal stress caused by refractory brick heat moves like cold at high temperature, which makes the stove wall easily form a circular crack. The requirements of the refractory fire brick lining are that the border heat is cold because the steel shell and thermal insulation material are cold, so the fire -resistant tiles with high thermal conductivity must be selected.
Mechanical scouring
Mechanical flushing and wear refers to the flushing of the furnace cylinder inner slag and iron flow to the furnace wall, the gas formed by the burning belt formed with the powder of the furnace furnace lining with the pink, and the furnace material from the top of the furnace in the furnace. The wear of the furnace lining.
