The increase of output and decrease of energy consumption of vertical roller mill have been the focus of attention of users of vertical roller mill. In general, the factors that affect the energy consumption of vertical grinding mainly include the particle size, moisture content, temperature, grindability, fineness of finished products and specific surface area requirements. We can reduce the energy consumption of the mill by developing and utilizing the new vertical roller mill, increasing the rotational speed of the vertical roller mill, and adding grinding AIDS in the grinding process. So as to reduce the energy consumption of the whole grinding process, reduce the production cost and improve the economic benefits. SBM small make up to help you explain how to realize the vertical roller mill energy saving and consumption reduction through these aspects of control.
1. Reasonable particle size matching of grinding materials. Under normal circumstances, the maximum grinding size allowed by the vertical roller mill is 75mm, but the content exceeding 45mm should not exceed 3%, the content exceeding 25mm should be less than 15%, and the material content not exceeding 25mm should be 85%. So we must follow “. Much wear and little wear” To ensure that the particle size before the material enters the vertical roller mill should be controlled at -25mm and 85%, so as to increase the output of the mill and reduce the energy consumption of the mill.
2. Water content of raw materials. Vertical mill has drying function, which allows the water content of the materials into the mill to be controlled within 15%, while the water content of the materials out of the mill should be less than 1% to prevent the raw materials from sticking and blocking in the mill. However, heat is needed to dry the materials. The heat energy used to dry the materials to evaporate water accounts for a large proportion of the total heat. Therefore, reducing the moisture content of materials into the mill is of great help to save heat energy and improve the efficiency of the mill.
3. Temperature of raw materials. The temperature control of the raw material can ensure the good grinding condition and avoid the high temperature of the raw material. If the temperature of the materials into the mill exceeds 90℃, the temperature in the vertical roller mill will generally exceed 120℃. The higher the temperature of the vertical roller mill, the stronger the static electricity generated by the product particles. The particles will gather under the adsorption of static electricity. Under the impact of the steel ball, they will stick to the steel ball and the lining plate, forming a buffer layer, resulting in a significant reduction in grinding efficiency.
4. The grindability of raw materials. The wear - resistant parts of the vertical roller mill include the roller and the disc. Therefore, it is necessary to control the materials into the mill and the hardness, according to the ability of the vertical roller mill to choose the materials with the same grindability. Also pay attention to the grinding materials do not mix with non-grinding or high abrasibility of the ore, leading to wear agent wear increase or damage, can also save energy parts wear rate.