Influence of burner position on kiln condition and condition adjustment

Influence of burner position on kiln condition and condition adjustment
When the burner is installed, its center point is at the same position as the center point of the kiln section when it is in the horizontal position. Before each maintenance, the position of the burner should be checked and verified. When the production is normal, the correct position of the burner and the method of adjusting the burner are:
1、 Judge whether the burner position is correct and adjust the burner method.
1. From the perspective of the kiln, the flame shape should be complete, powerful and active, not corrosive to the kiln skin, and cannot be burned with top materials. The outer flame of the flame contacts with the materials carried in the kiln. If the burner position is too high, the flame will wash into the kiln skin, the local temperature of the furnace is too high, and the service life of the kiln lining will be reduced. Moreover, the kiln skin of the firing zone will extend backward, and the thermal system in the kiln is disordered. In serious cases, the kiln will be red soon after feeding. At this time, the direction of the burner close to the material shall be properly adjusted to make the outer flame of the flame contact with the material. If the burner position is too close to the material inlet, the flame will hold the material, resulting in incomplete combustion of pulverized coal, and the rolled material wrapped in the furnace, which will cause serious reduction atmosphere and reduce the clinker quality. The gas with serious reduction atmosphere enters the preheater system to reduce the temperature of the liquid phase of the material, which will make the preheater system crusted, even blocked, and affect the normal calcination of the kiln. The distance between the burner and the material should be properly adjusted to make the flame smooth and powerful.
2. From the scanning image of the central control cylinder, it is more intuitive and simple.
(1) The kiln skin of the firing zone should be between 20-25m (the kiln skin of the small kiln should be shorter, and the kiln skin of the large kiln should be longer). The overall temperature distribution is uniform, there is no high temperature point, the temperature is 300-350 ℃, and the overall temperature of the transition zone is about 350 ℃. At this time, the flame is complete, active, and smooth. The burner position is appropriate, and the burnt clinker is also ideal.
(2) The temperature at the front is high, while the temperature at the back of the burning belt is normal, which means that the burner is far away from the material, or the flame has been forked and dispersed, and the fire power is not concentrated. The treatment method is to set up a poke hole at the side of the kiln head cover, and use manual or conditional air gun to clean it regularly each shift. If any problem is found, it should be handled in time, otherwise it will affect the output and quality of clinker. Adjust the flame shape and keep a little black flame at the flame root to avoid excessive flame temperature.
3. After burning the belt, the temperature is on the high side, especially after the 2nd wheel, which even reaches above 380 ℃, indicating that the burner is at a high position on the y-axis.
4. The temperature of the sintering zone is relatively low, and the temperature of the transition zone is not high, which means that the furnace skin of the sintering zone is relatively thick, too close to the material mouth, the fire is not smooth, and the material is pressed, and the yellow core material appears after the clinker is broken.
2、 Adjust normal and abnormal conditions.
Generally, if the temperature of the firing zone in the kiln is low, open the internal air butterfly valve and close the small opening of the external air butterfly valve to shorten the flame and increase the temperature in front of the kiln. When the temperature of the firing zone is high, open the large opening of the external air valve and close the small opening of the internal air butterfly valve to lengthen the flame, maintain a certain kiln speed, and improve the clinker output and quality.
If it is found that the kiln skin is too thick or caked, it should be disposed in time, otherwise the output and quality of clinker will be affected, so that all burners will enter the kiln, the external air butterfly valve will be fully opened, the internal air butterfly valve will be less open, and the central air valve will also be opened to make the flame longer, the burning belt will move backward, and the ring temperature will be increased. If there is flat material, it is proved that the rear ring has fallen, the burner will be fully returned to the kiln mouth position, the external air butterfly valve will be closed, and the internal air butterfly valve will be opened, The central air butterfly valve should also be turned down to shorten the flame, improve the kiln speed, control the clinker granulation temperature, and protect the shell with kiln. Because there are many factors that cause ring formation, it is not difficult to deal with it as long as the method is reasonable, and the specific analysis should be carried out according to the kiln type and ring formation structure.