Vertical Roller Mill

LUM Ultrafine Vertical Roller Mill

LUM series of ultra-fine vertical milling machine mainly consists of motor, reducer, roller device, disc device, pressing device, separator and other components. Is a sign of the mill industry to develop automated milling machine, which makes the emergence of ultra-fine powder grinding once completed, grading and delivery operations as one of the idealized design, its process parameters, mechanical properties and finished quality flour has reached international standards, European and American countries have been quite the same.

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Features

  • 1. High efficiency powder, the machine is suitable for a variety of materials, it is possible frequency control, specially designed material layer formed more easily than ordinary vertical mill, one-time grinding to the desired particle size.
  • 2. good economic returns, head separator principle, and each rotor frequency control are used, the grinding fineness within the selected range can achieve, you can do the second sorting, without the presence of low-grade material. Ultrafine grinding and long separator principle, the same as in the production of fine-grade product, compared with other mills, saving 30% to 50%, economic good.
  • 3. A high level of environmental protection, small vibration, low noise. Equipment integral seal and operates under negative pressure, no dust spills, clean environment, environmental requirements higher than the national standard.

Vertical Roller Mills In The Cement Industry

For vertical roller mills (VRM), water injection on the grinding table is a common way to stabilise the grinding vertical roller mill for cement grinding– material flow, feed aterials and productsbed and gives a smoother mill operation with lower vibration levels. however, there are some drawbacks to water use in a 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 a cement plant this will not pose a major problem, but for a standalone grinding this source of hot gases is not available to drive-off any additional water. In this case a 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. has been working on a system that can provide grinding without the need for any water injection. Even if some water is available the main aim is a grinding system that can be run without the need for permanent operation of a hot gas generator
vertical roller mill A 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 a rocess 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 and its customers are ssentially concerned with this final product and its properties which are influenced by all stages of the cement making process. Material enters the VRM via a rotary feeder that poses as an air lock , then moves down the feed chute to mills, has a 'S' support roller and a 'M' master roller. The 'S' roller is solely to prepare and stabilise the grinding bed. The most difficult thing to achieve when producing cement is to keep the grinding bed stable. In comparison to raw material grinding, with cement milling there are more fines and some parts of the grinding bed tend to become partly fluidised, internal friction within the material layer making it difficult to efficiently apply the grinding forces. So the 'S' roller removes the air from the grinding bed and prepares the material for the master roller to carry out the grinding.The flowsheet for a grinding system with a VRM shows that, after the classifier, product is precipitated and then recovered from the bag filter. caused by entrapped air. This reduces the A system fan provides the draft through the machine and different sources of hot gases can be utilized if required. Furthermore a wide range of feed materials are tolerated and conveyed to the mill via the feeding system


Working principle of vertical roller mill

Vertical roller mill drive motor through reducer rotating disc, grinding roller in the friction effect a millstone around the grinding roller shaft rotation, the material drops into the millstone central from the feeding port through the air lock feeder, by centrifugal force to the disc Edge mobile. Through the grinding zone, is engaging in the grinding roller and the grinding disc roller grinding. The grinding roller relative materials and a millstone crushing pressure is composed of hydraulic stretching device provides (suitable for crushing pressure can be adjusted according to the different material hardness). The materials in the crushing process, also by the shear stress of the grinding roller and the grinding disc and the grinding roller pressure due to relative motion between. The material is extruded in the disc, track formation bed (bed thickness from the disc material retaining ring height decision), and material between the bed material particles mutual extrusion and friction causes the corners and edges of spalling, played the role of further crushing. After grinding materials continue to exercise to the disk edge, until the overflow disk. Disc are arranged around the nozzle ring, hot air flow from nozzle ring high speed with bottom-up overflow material rising, in which the particles of the first landing to the disc, the smaller particles on the rise under the action of air flow into the powder selecting device for coarse and fine classification, coarse powder back to disc grinding, consistent with the powder fineness requirements as the finished product, along with the air flow with exports to the upper part of the shell into the dust collector is collected. For products containing water with hot air flow drying material is in the process of contact, by adjusting the temperature of hot air, can satisfy the different humidity material requirements, so as to achieve the required product moisture. By adjusting the separator, can achieve the required thickness of different products.


Vertical roller mill performance characteristics

vertical roller mill with high efficiency, low operation cost
the vertical roller mill is suitable for construction, and low investment cost
the vertical roller mill operation easy and reliable operation, convenient repair
the drying capacity of the equipment, grinding materials widely; the product quality is stable, uniform particle size gradation; environmental protection equipment, low noise, little dust, clean operation environment.

Technical data

LUM Ultrafine Vertical Roller Mill
Model LUM1125 LUM1232 LUM1436
Wheel diameter(mm) 1100 1200 1400
Capacity (t/h) 5~12 7~16 8~18
Fineness 400~650Mesh ~D97 ~D97 ~D97
Material Size(mm) <10 < 10 <10
Moisture <3% <3% <3%
Main Motor Power(KW) 250 315 355
Roller(set) 3 3 3
Classifier Motor Power 15 KWx5 15 KWx7 15 KWx7

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