What are the effects of improper burner position on rotary kiln calcination?
The harmful effects of abnormal burner position on rotary kiln calcination are as follows:
① The burner position is too high, the flame is long, and it burns far away, making it easy to damage the kiln skin and difficult to control the operation. In addition, due to the high temperature of the coal pipe, the material cannot be burned, often when there is less incoming material, it cannot be burned. Once there is more incoming material, the black shadow is easily washed over the fire point, causing a large slow train. The temperature is not easy to rise after slow driving, and once it burns, it is easy to overburn. Often, the front temperature is just right, and the back is already overburned, forcing the kiln air to be turned on quickly, greatly reducing coal, unstable thermal system, passive operation, and affecting production quality.
② The burner position is too low, and it can still burn when there is less material. Once there is more material, the flame will pierce down and come into direct contact with the material. The coal powder will be rolled up inside the material, causing incomplete combustion. Blue flames will appear on the surface of the material layer, and the ignition point will be cloudy. There will be more yellow core material, which will affect the color of the cement. At the same time, when burned close, the flame is short, which can easily form local high temperatures, causing lumps to form in the front and black shadows to follow closely behind. When driving slowly, it looks like it is burning, and as soon as it drives a little faster, the material rushes over from one side, forming a high content of CaO in the surface cooked sandwich material, which seriously affects the quality of cement.
③ The burner is outdoors, and the flame is generally coarse and unstable. The ignition point moves forward, and the black shadow is close. It is difficult to control the operation, and it is easy to slow down and burn out the front kiln skin.
④ The burner is fed too much, resulting in poor flame expansion and contraction force at the beginning. When the material layer thickens, it does not top the material, making the kiln cloudy and difficult to observe, making it difficult to operate and control; When the flame elongates, it is easy to burn the back kiln skin.
——Author：ebico