What should I do if the high alumina bricks used for tunnel kiln trucks hit the kiln wall on both sides?
In the operation of tunnel kiln, the selection of high alumina bricks is crucial. These bricks not only have to withstand high temperatures, but also ensure the stability and efficiency of the kiln. High-alumina bricks are favored because of their aluminum content of more than 70%. This high aluminum content gives them excellent high temperature resistance, corrosion resistance and thermal shock resistance.
In addition, the brick size of high alumina bricks is designed with negative dimensions, which is a precise choice based on material science and engineering principles. Negative dimensions mean that the actual dimensions of the brick after firing are slightly smaller than the nominal dimensions. This design takes into account the possible thermal expansion of high-alumina bricks in the high-temperature environment of the tunnel kiln.
As the temperature rises, high-alumina bricks will experience a certain degree of thermal expansion, and the negative-size design reserves space for this expansion, preventing brick cracks or kiln structural damage caused by thermal stress. In addition to thermal expansion considerations, negative sizing also helps combat issues with loosening of joint material that may occur over time with use. When the loose joint material causes the gap between the bricks and the kiln wall to increase, the negative size design of the high-alumina bricks can compensate for these gaps to a certain extent, reduce heat loss, and maintain the stability of the temperature in the kiln.
During the long-term operation of the tunnel kiln, the contact phenomenon between the high alumina bricks and the kiln wall is a technical issue worthy of attention. This phenomenon mainly arises from two factors.
First of all, as the kiln car bricks are used for an extended period of time, sealing materials such as joint fire clay or refractory cotton will gradually wear out. The loss of these materials will cause the gap between the bricks and the kiln wall to gradually increase, making the high-alumina bricks more likely to come into contact with the kiln wall during the operation of the kiln. This contact may not only affect the thermal efficiency of the kiln, but may also pose a potential threat to the structural stability of the kiln.
Secondly, the size selection of high alumina bricks is also an important factor affecting their contact with the kiln wall. If the size of high aluminum bricks is improperly selected, especially when the correct size is selected, the bricks may grow in size due to temperature, pressure and other factors during the construction process. This increase in size also causes the gap between the bricks and the kiln wall to decrease, thereby increasing the likelihood of contact between the two. In order to avoid or reduce the contact between high alumina bricks and the kiln wall,
The following measures can be taken:
First, regularly check and replace lost joint fire clay or refractory cotton and other sealing materials to ensure good sealing performance;
The second is to rationally select the size of high alumina bricks to avoid contact problems caused by excessive size;
The third is to strengthen the daily maintenance and inspection of the kiln, promptly discover and deal with possible contact phenomena, and ensure the stable operation and efficient production of the kiln.
