Characteristics of vertical roller mill

Operating advantages:
The rollers are in a lifted position when the vertical roller mill is started, ensuring trouble-free start-up. This eliminates the need for an auxiliary drive. A control system monitors the machinery and facilitates operation.
vertical roller mill arrangement:
This schematic illustrates a typical grinding installation. The arrangement is very simple and the operation is correspondingly flexible and reliable. To maintain the appropriate temperature in the vertical roller mill circuit. For example to ensure adequate dehydration of the gypsum when grinding cement-the layout is prepared with provisions for recirculation of hot exit gas to the vertical roller mill inlet. In case the vertical roller mill feed is wet slag or includes a significant portion of wet additives, addition heat must be provided, for inentance form a heat generator. Otherwise, if the vertical roller mill feed is very hot, the vertical roller mill exit temperature controls a damper for cold air intake.
Nozzle ring bypass system:
For slag grinding, a specially designed nozzle ring bypass allow the iron particles to segregate through nozzles without airflow and subsequently be removed by a magnetic separator to minimize wear of the vertical roller mill internals. One vertical roller mill, many products,The OK vertical roller mill efficiently grinds blended cements, with a wide range of additives such as slag puzzolana, limestone and fly ash. Its versatility is demonstrated by the ability to switch between a wide variety of mixes, and to vary the particle size to meet individual needs.
Particle size distribution:
Example of adjustment of particle sizedistribution when grinding to the sameBlaine surface. The required steepness of the particle size distribution curve is attained by sdjustment of the separatorrotor speed, the vertical roller mill airflow rate and the grinding pressure, in combination with the appropriate height of the dam ring.
Optimisation of operation：
Adjustment of vertical roller mill airflow and grinding pressure for optimisation of the operatinon, including adjustment of the particle size distribution, can be made immediately. Adjustment of the dam ring, however, requires a vertical roller mill stop, but only for a few hours. Switching between different types of products, for example from portland cement to slag, only requires easily made operating adjustments. Adjustment of the dam ring is not required. However, if the vertical roller mill is to operate for a long time with one specific product only it may be expedient to adjust the dam ring to optimise the Residue(%)vertical roller mill for operation with this specific product.