In the daily operation of a three cylinder dryer, if the furnace temperature is too high or if new materials are not added in a timely manner within a certain period of time, the dryer drum temperature will overheat.

1. The air velocity in the drying room is too low, and the outer droplets are the first to be dried during the mist group drying. Due to the fact that the initial velocity of the mist group is much higher than the gas velocity, it generates an upward swirling flow that causes the dry powder to enter the high-temperature zone. This part of the product undergoes deterioration and other phenomena after being subjected to high temperatures.

2. The exhaust gas temperature is too high, and many rotary drying products are carried by the exhaust gas before being separated. Therefore, the temperature of the exhaust gas directly affects the product temperature, and there is a relative temperature difference between the two. Generally, the exhaust gas temperature is about 10-30 ℃ higher than the product temperature. If the exhaust temperature is high, the product temperature will inevitably be high. If it exceeds the heat-resistant temperature of the product, it will overheat and deteriorate.

Once the above situations occur in the drum dryer, it is very likely to cause variations in the drum body, such as the appearance of heating cracks, radiating from the center to the surrounding areas, causing the entire section to crack. A cylinder with severe overburning will crack with a light blow when it is thickened, and transverse cracks will appear at the overburning area when it is pulled out

Therefore, in order to avoid these situations, we need to carry out appropriate manual control. During the operation of the dryer, we should always pay attention to the changes in the temperature gauge, and the fluctuation should not exceed about five degrees. This requires the operator to pay attention at all times and add coal frequently, adding a small amount of coal at a time, so as to maintain a constant temperature and save energy. If the exhaust temperature is too high, control the exhaust outlet temperature of the drying equipment by reducing the hot air inlet temperature or increasing the spray volume, so that the system establishes a heat balance relationship that meets the exhaust outlet temperature to ensure the temperature requirements of the product.