What are the reasons for abnormal coal mill outlet temperature?

If the reduction in the amount of coal actually entering the mill is caused by the coal feeder, the current decreases and the outlet temperature rises

Reduced coal feed rate, coal feeder jamming, empty coal hopper, power loss in the coal feeder, high temperature of the air entering the coal grinder, excessive opening of the hot air valves, severe coking and ash accumulation in the boiler, leading to an increase in air temperature; secondary combustion in the flue, resulting in an increase in air temperature; too low moisture content

From the perspective of coal feeding, the main reasons are: 1. The moisture content of the coal fed varies significantly. High moisture content results in a low outlet temperature. (When the desiccant is constant) 2. The coal feeding rate varies significantly. Large quantity, low outlet temperature. (When the desiccant level is constant) 3. When the amount of powder returning changes significantly, such as when the powder-return air-locker is not functioning properly, this also has an impact on the outlet temperature. From the perspective of desiccants, the main reasons are: 1. Large fluctuations in the temperature of the drying air. 2. The dry air volume varies significantly. 3. The composition of the dry air changes significantly, such as an elevated water vapor content in the flue gas. From the perspectives of operation and process equipment: 1. The operational skills of the staff are low. 2. There is a problem with the equipment or instruments.