reasons for ring and egg formation in rotary kilns

2024-01-24

During the operation of rotary kilns, there is usually a phenomenon of ring formation. There are various reasons for ring formation in rotary kilns, and if not solved in a timely manner, it can easily affect production efficiency. The ring formation is usually located near the surface of the refractory kiln lining near the solid fuel combustion point, with a thickness of about 200-500mm. Based on years of practical experience, our company has summarized the causes and treatment measures of ring formation as follows.

1. Cause of circle formation

The formation of agglomeration is similar to that of agglomeration. If the kiln speed is slow, it is easy to form agglomeration, which can be divided into two types: front agglomeration and rear agglomeration.

2. Handling measures

A. Measures for handling the front knot

The treatment of the front ring is very simple. First, check if the ring is high. If it is not high, it will not have a significant impact on the calcination operation. Increase the thickness of the calcined material layer and extend the residence time of the material. When the current ring is relatively high, the kiln condition and thermal engineering will be affected, resulting in poor ventilation inside the kiln, inability to extend the flame, changes in flame shape, etc., making it difficult for large pieces of clinker to roll out and damage the kiln skin. The reason may be due to long-term burning of the coal injection pipe or gradual deterioration of the cooling effect, high kiln head temperature. When processing, the coal injection pipe is pulled out, and the high temperature flame concentrates on the ring position, and then it is burned off.

B. Measures for handling post coiling

The treatment of post coiling adopts the alternating cold and hot method, and the coiling is between the firing zone and the transition. If this type of coiling is not treated in a timely manner, it will affect the ventilation, output, and quality of the system. Its processing method mainly depends on the length or height of the rear knot, which can be adjusted by adjusting the flame shape to make the flame thick and short, and reducing the temperature at the knot.

If the circle is already very high, it will seriously affect the ventilation inside the kiln. At this time, the feeding amount should be reduced, and the coal injection pipe should be extended as much as possible. It is necessary to add exhaust air to make the flame smooth, reduce exhaust air, burn for two hours, and burn the circle until it is crossed.