Vertical roller mill grinding parameters

(1) the mill ventilation: roller mill is a kind of air swept mill, ventilation should be appropriate. Insufficient air flow, qualified raw material can not be brought out, the material layer thickness, increase the amount of slag, equipment load is high, lower yields; wind is too large, the material layer is too thin, the impact of the mill stable operation. Therefore, the vertical roller mill ventilation must match the output, not when the big, sometimes small, should remain stable. In principle, the operator selects the ventilation rate, and should be more conducive to maintaining the mill load, whichever is relatively stable, and seeks minimal vibration, slag material at least, the highest yield and best quality. In actual operation, the operator based on trends fan speed, current, pressure, volume of feed, import and export of negative pressure, temperature and other variables, to understand the operation of the mill, combined mill vibration, slag volume, product quality and other adjustments, typically by adjusting the opening of the circulation fan speed and flap in order to achieve optimum ventilation. Under normal circumstances, the entire job stability, the various trends also show a smooth, once one of these variables change, and soon it will affect changes in other variables. At this point, to make timely adjustments, otherwise the situation could stop the mill vibration may occur. Some vibration stops entirely due to negligence or lack of experience, such as: reducing material diminished when the wind, feeding time without wind, etc., may cause abnormal changes in pressure, so that the mill out of control vibration stops. (2) the material layer thickness: vertical mill, another important factor is the stable operation of the bed stability. Material layer stability, wind, air pressure and volume of feed to stabilize, or we need to maintain the material thickness by adjusting the air volume and the volume of feed. If not it will lead to timely adjust the vibration intensifies, the electrical load to stop jumping up or system problems. Theoretically, the material layer thickness should be the diameter of the roller 2% ± 20mm, the vertical mill grinding roller diameter of 3000mm, so the 60 ± 20mm is suitable material thickness. This requires the operator to pay close attention to changes in the material layer trend, try to be controlled within the optimum range, in order to ensure stable operation of the mill. In addition, raw material thickness also depends on the particle size, grindability, particle size distribution, moisture content, etc. Initial operation, in order to find the best material thickness, have debugging gauge ring height. While in the ring height gauge certain conditions, one of the important conditions for a stable material thickness is feed particle size and particle size with the management. Feeding the average particle size is too small or too fine, thin material layer; average particle size is too large or too many chunks of material when the material layer will thicken, mill load increases. Can be controlled by adjusting the amount of water spray, grinding pressure, circulating air flow and separator speed and other parameters.

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