H2FV-28-C flender power transmission tianjin co ltd Helical speed reduction gearboxes H2

Flender/Flender Gear Units/Helical speed reduction gearboxes H2

bration levels. However, there are some drawbacks to water use in VRM. The feed moisture for OPC is commonly very low and in case water is added to the grinding process it has to be evaporated requiring thermal energy. If cooler exhaust gases are available in cement plant this will not pose major problem, but for standalone grinding this source of hot gases is not available to drive-off any additional water. In this case hot gas generator is needed to dry the material and to provide sufficient energy for the grinding system. This solution not only wastes fuel, it also creates further expenses. In some parts of the world the cement industry is not permitted to utilise water or its use is limited. Loesche has been working on system that can provide grinding without the need for any water injection. Even if some water is available the main aim is grinding system that can be run without the need for permanent operation of hot gas generator. VRMs vertical roller mill can process many materials such as clinker, slag, gypsum, fly ash or limestone to produce various cement types of various finesse. The mill is part of process that begins at the quarry. Only after the initial material has been through the raw material grinding, preheater, kiln and the cooler it reaches the finish mill where additives are added and the final product is obtained. Both Loesche and its customers are essentially concerned with this final product and its properties which are influenced by all stages of the cement making process. Material enters the VRM via rotary feeder that poses as an air lock (see Figure , then moves down the feed chute to what is the centre of the rotating grinding table. The product is then driven outwards by centrifugal forces, underneath the rollers where the grinding takes place. Ground material moves over the dam ring and goes up with the gas flow to the classifier. The material has either reached the required fineness and leaves the mill towards the bag f