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Feeding Method of Rotary Kiln

Published:2015-10-31

Rotary kiln is mainly used for the calcination of powder and granular materials. In the process of equipment production, the feed affects the operation speed and production efficiency of the equipment. In the process of feeding, there will also be a problem of how much material is needed. How should we operate it? The following is a detailed introduction:

When there is a large amount of feed into the rotary kiln, there will be positive pressure at the kiln head, and the temperature at the cyclone outlet, calciner and kiln tail will drop sharply. At this time, the kiln speed should be appropriately reduced, the feed rate should be reduced, the exhaust air should be opened, and the coal injection pipe should be extended. In this way, the kiln tail temperature can be increased and the pre burning effect of materials can be enhanced. However, it can not be too much coal, otherwise it will cause reduction atmosphere and make the temperature in the kiln It's lower. When the current of the main drive motor of the kiln drops rapidly, the kiln speed should be reduced, the coal injection pipe should be withdrawn, and the exhaust air volume should be adjusted appropriately. At this time, the short flame burning can be used to make it return to normal. When the kiln working condition is normal, feeding should not be conducted to raise the temperature, which will make the operation in a passive state, and it is difficult to guarantee the production and quality.

When there is less feed into the rotary kiln: do not extend the coal injection pipe into the kiln, open the exhaust air and lengthen the flame, which will cause the temperature at the kiln tail to rise sharply, and the temperature of the calciner and cyclone will also rise rapidly, which will easily cause the adhesion or even blockage of the cyclone or the feeding pipe, and the flue chamber and precalciner at the kiln tail are easy to crust and increase the system resistance.

The correct feeding method is as follows: withdraw the coal injection pipe to the outside properly, turn off the exhaust air, reduce the coal feeding amount of the decomposing furnace and kiln head, control the temperature of the kiln tail and the cyclone, adopt the short flame burning to wait for the arrival of the materials. In normal production, the feeding is fluctuating, but the fluctuation range is small. However, when there are some problems with the equipment, or the moisture of raw meal is not easy to control in rainy season, it is easy to agglomerate raw meal on the top or wall of the warehouse, resulting in poor blanking. In this case, operators are required to observe and adjust frequently, and have certain predictability.

In a word, in order to improve the production efficiency of the equipment, we should judge the amount of materials in time when the rotary kiln is feeding, and operate according to the correct feeding method, so as to reduce the impact on the output, quality and efficiency.


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