Five specific vertical mill operating point analysis

1, stable material bed  Remained stable material bed, which is the foundation bed abrasive grinding roller, the key to normal operation. Material thickness gauge ring by adjusting the height adjustment, the correspondence between the appropriate thickness and between them and the Raymond mill output, we should first find out during the commissioning phase. Grinding efficiency reduces material layer is too thick, too thin material layer will cause vibration. Such as the roll increases, the more fines are generated, the thinner the material layer; rolling reduction, disc material thicker, more material corresponding return, the material layer thickens. Winds from the mill to improve and increase internal cycle, material layer thickness, lower wind speed, reduce internal cycle, the material layer thinning. In normal operation under the bed thickness roller mill grinding roller compacted by not less than 40 ~ 50ram.  2, the control grinding pressure  Grinding pressure is a major factor in mill production, mill grinding efficiency and power of influence. Vertical roller mill is subjected to high pressure by means of the material bed and the crushed material, the pressure increases to increase production, but after reaching a certain critical value does not change, the attendant increase in pressure is to increase the power, resulting in unit energy consumption increases, so the appropriate roll to yield and energy both. This value depends on the material properties, particle size and volume of feed. When the trial production grinding pressure to find a suitable and reasonable wind pressure can form a good internal circulation, so that the material layer on the disc proper, stable, high grinding efficiency. In the production process, when the wind ring a certain area, the wind speed is determined by the amount of wind. Corresponding relationship between the production process and the ability to ensure the grinding effect.  3, to ensure a certain degree of the grinding temperature  Vertical mill is drying and grinding system, a mill drying temperature is a measure of whether the normal operation of the integrated indicators. In order to ensure good drying of raw materials, the grinding material moisture content of less than 0.5%, the general control of the mill outlet temperature at 90 ~ C or so. If the temperature is too low then the finished water large, so that the grinding efficiency and reduce separator efficiency, it may cause condensation collecting system; if too high, indicating that the flue gas humidification cooling is not enough, also affect the collecting effect.  4, reasonable wind speed control  Vertical mill stream driven mainly by material circulation. Winds can form a reasonable good internal circulation, so that the material layer on the disc proper, stable, high grinding efficiency. However, the amount of wind is determined by wind speed, and wind and the amount of feed is linked, such as feeding a large amount of air flow should be large; otherwise reduced. Fan unit affected system resistance can be adjusted by adjusting the fan valve. Drop mill, feed mill negative pressure, the negative pressure can reflect the amount of wind mill size. Pressure drop, negative pressure indicates wind speed, air volume; otherwise, the corresponding small amount of wind speed. These parameters are stable, says the amount of wind is stable, thus ensuring the stability of the material bed.  5, control raw material fineness  Fineness of raw material by a separator speed, air volume system, the mill load and other factors. In the air volume and load unchanged, can be adjusted by changing the rotational speed manual fineness, when adjusting a maximum increase or decrease 2r / min, resulting in mill vibration over the General Assembly to increase even tripping.