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Nigeria Cement Plant Vertical Roller Mill

Nigeria Cement Plant Vertical Roller Mill

Analysis Of The Causes Of Slag From Vertical Roller Mill

Vertical Roller Mill slag refers to the metal and large-density mixed stones mixed in the material from the nozzle ring under the standard wind that can blow the material. The scraper is removed from the outside of the Vertical Roller Mill, so there is a small amount. The process of debris removal. If the amount of slag is small, we can ignore it for a while, but if the amount of slag is obviously increased, it needs to be adjusted in time to stabilize the working condition. The reason for causing the Vertical Roller Mill to slag is described below.

  • 1. The material of the Vertical Roller Mill mixed silo is seriously isolated. When the bin level is low, the bulk material is concentrated and falls, the material grinding time is not enough, and the coarse powder overflows from the tap hole.
  • 2. The displacement of the Vertical Roller Mill system is out of regulation. Due to misalignment of the gas flow meter or other reasons, the system ventilation is greatly reduced. The reduction in wind speed at the spout ring causes a large amount of slag.
  • 3. The Vertical Roller Mill system has serious air leakage. Although the air volume at the fan and the gas flow meter is not reduced, due to a large amount of air leakage from the Vertical Roller Mill and the grinding pipe, the cyclone cylinder, the dust collector, etc., the wind speed at the nozzle ring is lowered, and the slag is severe.
  • 4. The ventilation area of ​​the nozzle of the Vertical Roller Mill is too large. This phenomenon usually occurs on mills with poor grindability of materials. Due to poor wearability, the capacity of the Vertical Roller Mill selected to maintain the same stage capacity is large, the output is not increased, and the ventilation volume does not need to be synchronized according to the specification. Increase, but the area of ​​the spout ring increases. If the ventilation area is not reduced in time, the air velocity of the nozzle ring is lower and the slag is more.
  • 5. The internal seal of the Vertical Roller Mill is damaged. There are two upper and lower sealing devices between the disc holder and the lower frame of the Vertical Roller Mill. If the seal is damaged in these places, the air leakage will be severe, which will affect the wind speed of the spout ring and cause the slag to increase.
  • 6. The gap between the grinding disc and the spout ring of the Vertical Roller Mill increases. The gap is generally 5 to 8 mm. If the iron member for adjusting the gap is worn or dropped, the gap is increased, and hot air passes through the gap, thereby reducing the wind speed at the nozzle ring and causing an increase in the amount of slag.
  • 7. The grinding pressure of the Vertical Roller Mill is too low. The normal grinding pressure of the Vertical Roller Mill is 9~12MPa. When the grinding pressure is lower than 9MPa, the internal material layer thickness of the Vertical Roller Mill is higher than the retaining ring, and the material is scattered to the surrounding under the centrifugal force of the grinding disc, and the spit Large slag.
  • 8. The spray ring of the Vertical Roller Mill is seriously worn. Due to the serious wear of the nozzle ring, a good swirling wind cannot be formed in the grinding chamber, and the wind pressure is unbalanced or the air velocity of the nozzle ring is insufficient to cause slag.

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