Application of Vertical Mill In Pulverized Coal

In order to meet the needs of energy saving and environmental protection, many power plants choose or switch to a more advanced vertical roller mill (also called vertical roller mill) system for coal powder preparation. The vertical roller mill coal grinding system is generally composed of a vertical roller mill main body, a fine powder collecting device, a fan, and a pipeline. The working process is that the raw coal enters the vertical roller mill and is ground by the air (or hot air) into the classifier, and the fine coal is collected by the fine powder collecting device and then entered into a coal powder warehouse or a coal powder conveying device.

Grinding characteristics of coal

At present, conventional coal mills and other equipment are used in coal power plants. These equipments are relatively familiar to everyone and will not be repeated here.

In order to meet the needs of energy saving and environmental protection, many power plants choose or switch to a more advanced vertical roller mill (also called vertical roller mill) system for coal powder preparation. The vertical roller mill coal grinding system is generally composed of a vertical roller mill main body, a fine powder collecting device, a fan, and a pipeline. The working process is that the raw coal enters the vertical roller mill and is ground by the air (or hot air) into the classifier, and the fine coal is collected by the fine powder collecting device and then entered into a coal powder warehouse or a coal powder conveying device.

The system arrangement adopted can adapt to the characteristics of the above-mentioned coal pulverizer. The differences between it and general pulverizers are described below.

working process of vertical roller mill

The vertical roller mill used in industry is a kind of roller mill. The basic principle is to place the material to be ground between the grinding roller and the grinding disc, and use mechanical force such as spring force, hydraulic pressure or centrifugal force generated by rotation. Etc., it is crushed and crushed. This kind of grinding equipment using the principle of bed extrusion crushing has higher grinding efficiency, lower power consumption and less wear than grinding equipment using shearing and impact forces. There are many types of vertical roller mills, typically a widely used LM series of vertical roller mills with rotating discs and relatively non-moving rollers (without revolving around a vertical line).

LM series vertical roller mill is mainly composed of hot air ring road, grinding disc, roller device, hydraulic device, vertical roller mill reducer, classification device, machine base, etc. The vertical roller mill reducer is installed on the ground The grinding disc is mounted on the vertical roller mill reducer. The motor drives the reducer to rotate the grinding disc around the vertical line of the ground. The grinding rollers roll the materials placed on the grinding disc under the hydraulic pressure generated by the hydraulic device. The vertical line on the ground revolves, but rotates around its own axis under the resistance of the material. The ground material is subjected to a bottom-up air flow in the annular area on the edge of the grinding disc. The tube discharges the fine powder collection device.

Outstanding advantages of vertical roller mill

Excellent structure and low investment

Compared with the conventional mill, Shibang vertical roller mill has a significant improvement in its structure: using a reducer with simple structure and reliable operation to improve reliability and maintenance; using thin oil circulating lubrication to improve bearing life.

Good wear resistance and long service life of vulnerable parts

Wear is related to three factors: grinding force, material of grinding medium and grinding method. Among the three factors, the grinding force is determined by the crushing ratio of the material, and the grinding effect cannot be reduced by reducing the grinding force generally; the material of the grinding medium is an important adjustable factor, which has the research and application expertise of wear-resistant materials. The vertical grinder uses high chromium and high alloy steel to manufacture the grinding roller and wear-resistant lining plate, and its crystal structure is high wear-resistant carbide (WC) embedded in the martensite body , tic, etc.) hard phase, in addition to containing more than 20% Cr, there are precious W, V, Ti, Mo, Mn, Cu and other alloy elements, which make the life of wear-resistant parts long. For manganese ore and other highly abrasive materials, the life of grinding roller and wear-resistant lining plate can also be more than half a year. In the grinding mode, only crushing efficiency is achieved, medium wear is small, and the important point of designing grinding working chamber is to use special cross-section grinding roller to reduce wear Low sliding wear, long service life of vulnerable parts, vertical grinder has fully achieved

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