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Three Principles for Debugging Vertical Roller Mill

Article source:admin Popularity:Dateline:2019-06-15 16:16

After installing the vertical roller mill, we should not put it into production immediately. We need to debug it first to see if it can work smoothly. When debugging equipment, three principles should be remembered.
1. Stable Material Layer
The vertical roller mill uses a material bed to grind, so the stable material layer is very important for the safe operation of the mill. Under normal conditions, the thickness of the upper layer of the grinding disc is about 30-60 mm. At this time, the mill runs smoothly, the grinding sound is soft, and the material quantity inside and outside the mill is basically unchanged. The material layer is too thin, the mill vibrates greatly; the material layer is too thick, the mill load is too large and the grinding efficiency is low, and severe vibration will also be caused.
2. Material Balance
In the operation of the vertical roller mill, the feed rate, grinding capacity, air flow, slag discharge or external circulation should be in a balanced state. In the case of a certain amount of feed, if the grinding capacity is insufficient, it will cause a lot of slag vomiting, and more and more slag vomiting. At this time, the working pressure of the hydraulic station (adjusting the overflow pressure of the relief valve) should be increased appropriately to enhance the grinding capacity or reduce the feeding capacity appropriately; conversely, if the grinding capacity is too strong, the material layer will gradually thinning and eventually cause the vibration of the vertical roller mill, and the worker of the hydraulic station should  reduce appropriately pressure or increase feed volume. Another case is that if the grinding capacity is appropriate and the air conveying capacity is insufficient, it will also cause a large number of slag vomiting, in which the fine powder content is relatively large, at this time the air volume should be increased and the conveying capacity should be enhanced. Therefore, during the operation of vertical roller mill, the material balance principle is used to find out the problems in the operation of vertical roller mill beforehand, and corresponding measures are taken to prevent unnecessary shutdown and debugging failure.
3. Appropriate Wind Temperature and Volume
Generally, the mill operates under negative pressure, and a lot of hot air is needed for material conveying, grading and drying. Air volume should first meet the requirements of conveying materials, too small air volume will cause a large number of qualified fine powder can not be timely conveyed out; too large air volume will not only cause energy waste, but also cause products to run rough. The air temperature should be determined by the moisture content of the grinding material. The wind temperature should be increased when the moisture content is large, and lowered when the moisture content is small, but the temperature of entering the mill should be less than 350 C. In addition, in order to prevent the condensation of the bag dust collector (condensate water), the grinding temperature should be controlled in the range of 80-100 C.

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Keywords:vertical roller mill

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