Reasons and Treatment Methods of Coal Grinding System Failure

The reasons and treatment methods of the coal grinding system failure are as follows:
A. Reason: too much amount of coal
Phenomenon: 1.Grinding sound low and the electric ear signal becomes low 2. Coal mill current from the big suddenly smaller 3. Coal mill import and export pressure drop
Treatment: 1.Reduce the amount of coal, and in the low amount of coal to run for some time to eliminate the wear of coal within the coal 2. Gradually increase the coal, so that grinding back to normal 3. Stable coal to make it work
B. Reason: Too little amount of coal
Phenomenon: 1.Grinding sound high, sound crisp 2.Grinding current becomes smaller 3.Coal mill imports, coal mill export pressure becomes smaller
Treatment: 1.Gradually increase the amount of coal, so that coal mill back to normal 2.Confirm whether the coal bunker overhead
C. Reason: Grinding dry warehouse block
Phenomenon: 1.The electric ear signal becomes high, grinding sound high, sound crisp 2.Grinding pressure increased.
Treatment: 1.Check the coal whether contain large amount of water, if the larger may be appropriate to reduce the amount of coal 2.The appropriate increase in coal mill inlet temperature 3.Such as the above measures no significant effect, stop grinding maintenance.
D. Reason: the main bearing temperature is high
Phenomenon: 1. Temperature indicator is high 2. Bring up the temperature trend, confirm the temperature rise rate
Treatment: 1. Check the fuel supply system, check the oil pressure, the temperature is normal, if not normal to adjust 2. Check the oil in the water or other debris 3. Check the grinding temperature is too high, such as high Adjust 4.Check the cooling water system 5.Finally determine whether the instrument failure
E. Reason: The outlet gas temperature is too high
Phenomenon: 1.Hot air volume is too much 2.Coal mill imported cold air valve opening is too small 3.Too little coal
Treatment: According to the normal operation of the adjustment, make the wind, material balance.
F. Reason: The outlet gas temperature is too low
Phenomenon: 1.The amount of hot air is too small. 2. Coal mill imported cold air valve opening is too large. 3. The amount of coal too large 4.The original coal water is bigger.
Treatment: According to the normal operation of the adjustment, make the wind, coal balance.

G. Reason: Bag filter outlet temperature is too high
Phenomenon: 1.Bag filter ash fouling 2.Hot air volume 3.Coal mill cold air valve opening small
Treatment: 1.Inform the scene of ash 2. Adjust the small hot air baffle 3.Increase the cold wind baffle opening