How to Extend the Service Life of Refractory Materials in a Cement Rotary Kiln?
How to Extend the Service Life of Refractory Materials in a Cement Rotary Kiln?
Refractory materials are an important component of a cement rotary kiln, installed inside the kiln cylinder to reduce the temperature of the cylinder, reduce heat loss, and prevent the clinker from coming into direct contact with the cylinder during the calcination process, thereby prolonging the service life of the rotary kiln. Therefore, refractory materials are very important in the part of a cement rotary kiln. However, in actual production, refractory materials are subject to mechanical, thermal, and chemical erosion factors, resulting in shorter service life and premature damage. Therefore, it is important to use technical measures to extend the service life of refractory materials, reduce the consumption of refractory materials and production costs, improve product quality, and it is also a consistent concern of cement enterprises.
Factors affecting the service life of refractory materials:
2. Mechanical stress affecting the service life of refractory materials
Mechanical stress refers to the internal force generated within an object when it deforms due to external factors, which resists this change and causes the object to return to its original position. When the refractory brick inside the kiln exceeds its own mechanical stress limit, the refractory brick will be damaged under mechanical stress.
2. Thermal stress affecting the service life of refractory materials
Thermal stress refers to the stress generated when temperature differences form, causing mutual constraints between objects inside and outside, preventing them from shrinking freely and generating stress. This stress also damages refractory materials and is an important reason for their damage.
3. Production operation affecting the service life of refractory materials
Excessive calcination temperature inside the kiln can also cause refractory material damage. In addition, the working temperatures of the transition zone, firing zone, cooling zone, kiln head hood, the throat of the cooler, and outer side of the nozzle are also relatively high, which can also affect the service life of refractory materials. In addition, faster rotation of the kiln will also cause refractory material damage.
Technical measures to extend the service life of refractory materials:
1. During production operation, it is necessary to strictly control the deviation of the kiln axis and ensure that it does not exceed 3mm. Once it exceeds 3mm, it needs to be corrected.
2. Determine a reasonable size for the ring gap to reduce the impact of thermal stress.
3. Determine the calcination temperature according to the nature of the material.
4. During production operation, choose a suitable kiln speed according to the material quantity, clinker size, and growth status.