Under normal circumstances, the temperature instability at both ends of the rotary kiln equipment is mainly due to the excessive amount of coal fed to the kiln head, because this will cause the temperature of the firing zone of the rotary kiln system and the ends of the kiln to fluctuate, causing "black shadows" in the kiln. "Approaching the kiln head, resulting in unstable calcination of the rotary kiln.

 

   This article mainly talks about the cause of temperature non-uniformity from the feeding aspect. The low temperature of the rotary kiln firing zone and the kiln is characterized by loose, dull, low rise and low free calcium oxide content on the clinker surface. The main reason for this phenomenon is that the kiln system feeds unevenly, and under certain circumstances, the feed increases sharply, resulting in poor pre-burning of the material and excessive heat load in the firing zone. In addition, due to the air leakage at the end of the kiln, the exhaust kiln is too small and the air volume is insufficient. In addition, if the amount of coal added in a long period of time is small, the coal quality changes too much, the ash content is large, and the pulverized coal is uneven, the kiln temperature is unstable and the unreasonable calcination occurs. Generally, when the rotary kiln firing temperature is too low, the slow kiln heating method is adopted to slow down the kiln speed and increase the kiln temperature. If the temperature is still not stable, and the raw material black shadow continues to move forward, the kiln speed of the rotary kiln will continue to decrease until the black shadow in the kiln is stabilized. In addition, when the rotary kiln firing temperature is not too low, the amount of coal fed and the amount of primary and secondary air can be increased.