What are the reasons for the phenomenon of ring formation in the kiln, and how to prevent and deal with it
In the operation of kilns in industries such as cement and lime production, ring formation inside the kiln is a common and difficult problem, which can seriously affect the normal operation and production efficiency of the kiln.
There are multiple reasons for the occurrence of ring formation in kilns. Firstly, the raw material composition fluctuates greatly. If the impurity content in the raw material is too high, low melting point compounds are easily formed during the calcination process, causing the material to adhere to the kiln wall. Secondly, improper temperature control inside the kiln can lead to premature liquid phase formation of materials due to excessively high local temperatures, increasing the possibility of ring formation. Furthermore, the unstable feeding amount can cause disorder in the thermal system inside the kiln, which can also easily lead to ring formation. In addition, if the kiln speed is unreasonable and too slow, the material will stay in the kiln for a long time and be prone to sticking; Poor ventilation can result in uneven airflow distribution inside the kiln, and some areas are prone to forming circles.
To prevent ring formation inside the kiln, a series of measures need to be taken. Strictly control the quality of raw materials to ensure stable composition; Accurately control the temperature inside the kiln to avoid local overheating; Stabilize the feeding amount to ensure the stability of the thermal system; Reasonably adjust kiln speed and optimize parameters according to production conditions; Strengthen ventilation management to ensure smooth airflow inside the kiln.
Once a ring phenomenon occurs, it should be dealt with in a timely manner. For smaller loops, the alternating cold and hot method can be used to adjust the flame shape and temperature, causing uneven heating and detachment at the loop. High pressure water guns can also be used to impact the ring, but attention should be paid to controlling the water volume and angle to avoid damage to the kiln lining. If the ring is severe, the kiln needs to be stopped for manual cleaning, and safety precautions should be taken during cleaning to prevent accidents such as burns and kiln collapse.
The phenomenon of ring formation in the kiln poses a significant threat to production, but by understanding its causes and taking effective preventive and treatment measures, the probability of ring formation can be reduced, ensuring the stable operation of the kiln and improving production efficiency and product quality.
