Low Operating Cost Vertical Roller Mill For Coal / Cement / Slag / Raw Material
Description
Coal vertical mill can be widely used in cement, electric power, steel, metallurgy and other industries. Due to its special process and structure, the coal vertical mill has less dust and noise in the production process. The pulverized coal produced has high efficiency grading and excellent combustion performance. The coal vertical mill produced by our company has simple process and compact equipment, and the fineness of pulverized coal can reach 80 μ MR 3%, with stable fineness and uniform particle size.
HVM vertical coal mill is a kind of advanced grinding equipment which is safe, environmentally friendly, energy-saving and efficient, and integrates drying, grinding, powder selection and transportation functions. It is designed and developed on the basis of extensive absorption of various advanced technologies of vertical coal mills at home and abroad and reference to a large number of engineering application experiences. The main performance and economic and technical indicators of the equipment have reached the international advanced level.
Working principle: the motor drives the grinding plate to rotate through the reducer, the material falls in the center of the grinding plate from the feed port, and the hot air enters the mill from the air inlet. Under the action of centrifugal force, materials move towards the edge of the grinding plate. When passing through the circular groove on the grinding plate, they are crushed by the grinding roller. The crushed materials are carried away at the edge of the grinding plate by the high-speed airflow at the wind ring. Large particles directly fall onto the grinding plate for re grinding. When the materials in the airflow pass through the dynamic and static separators, under the action of the rotating rotor, the coarse powder falls onto the grinding plate for re grinding. The qualified fine powder is grinded together with the airflow, The product is collected in the powder collecting device. Materials containing water are dried in the process of contacting with hot gas to reach the required product moisture.
Technical DATA
| Specification | HVM1250 | HVM1300 | HVM1500 | HVM1700 | HVM1900 | HVM2200 | HVM2400 | HVM2800 |
| Grinding table median diameter(mm) | 1250 | 1300 | 1500 | 1700 | 1900 | 2200 | 2400 | 2800 |
| Capacity(t/h) | 10-15 | 10-15 | 14-22 | 20-28 | 26-35 | 35-45 | 45-56 | 70-90 |
| Coal Moisture(%) | ＜15 |
| Coal Power Fineness(%) | R0.08=2-12 |
| Coal Power Moisture(%) | ≤1 |
| Main Motor Power(kw) | 110/132 | 160/185 | 220/250 | 315/355 | 400/450 | 450/500 | 560/630 | 900/1120 |
Advantage
1. High pulverized coal quality
It adopts advanced dynamic and static combined separator, which has high classification efficiency and large adjustment room. The fineness of powder separation can reach more than 0.08 mm and less than 8% of the screen residue. It can meet the fineness requirements of most low-quality coal or anthracite grinding in the cement production line.
2. High efficiency and large capacity
The working efficiency is higher. Compared with the old vertical mill of the same model, the output is increased by more than 20-50%, and the operating power consumption of the pulverizer is greatly reduced.
3. High system security
By adopting explosion-proof measures such as temperature detection device and online gas analyzer, the safe operation of the equipment is effectively guaranteed.
4. Comply with environmental standards
Through the unique sealing structure design, the whole system is in a negative pressure state, and there is no dust overflow and low noise in the production process. The pulverized coal is collected by the special air box pulse dust remover for coal grinding, and the dust emission concentration meets the national standard.
【Scheme introduction】
HVM vertical mill can handle materials with high water content from 20% to 30% (such as calcium carbide slag, lignite, etc.) to materials with water content less than 1% (cement clinker, etc.), and has strong adaptability to material water.
Solution
For the treatment of materials with high moisture content, the drying capacity of vertical mill is highly required. The drying capacity of vertical mill should be taken as an important direction of equipment selection. Through the heat balance calculation of the vertical mill process system, the grinding, drying and powder selection capabilities of vertical mill should be scientifically and rationally matched. On the premise of ensuring that the materials meet the drying requirements, the grinding and powder selection output should be given full play to the best level, so as to achieve reliable, efficient Energy saving;
For the treatment of low moisture materials, since the vertical mill is essentially a material bed grinding, when the moisture of the materials to be grinded is too low, it is difficult to form a stable material layer on the grinding plate after the materials enter the vertical mill, which will cause abnormal vibration of the vertical mill and make it unable to operate stably. In order to ensure the stable operation of the vertical mill, it is necessary to solve the problem of how to stabilize the material layer. Generally, the measures that can be taken include active means (such as controlling and adjusting the thickness of the material layer, grinding pressure, height of the retaining ring, slag discharge, etc.) and passive means (such as adding water sprinklers, etc.).
On the premise of giving priority to ensuring the grinding capacity, reasonable consideration should be given to the powder selection capacity of the vertical mill.
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