Vertical coal mill is a specialized equipment used to grind coal into coal powder, which has a wide range of applications in various industries such as power, cement, and chemical. Here is the relevant introduction:
Structural composition
Grinding disc: located at the bottom of the mill, it is the main working component for grinding coal. A wear-resistant lining plate is usually installed on the grinding disc to improve its service life.
Grinding roller: Generally installed above the grinding disc, it applies pressure through a hydraulic system to squeeze coal between the grinding disc and the grinding roller for grinding. The number of grinding rollers is usually 2-4, and their surfaces are also made of wear-resistant materials to resist wear during the grinding process.
Separators: located at the upper part of the mill, used to classify the ground coal powder. It uses rotating blades or airflow to return coarse powder that does not meet the particle size requirements to the grinding disc for further grinding, while qualified fine powder is discharged from the mill with the airflow.
Transmission device: including motor, reducer, etc., used to drive the rotation of the grinding disc and provide power for the grinding process.
Sealing device: prevents coal powder leakage and external air from entering the mill, ensuring the normal operation of the mill and a clean working environment.
Working principle:
The material enters from the feed port of the mill and falls onto the rotating grinding disc. The grinding disc rotates under the drive of the transmission device, generating centrifugal force that moves the material towards the edge of the grinding disc. During the movement, the material is gradually crushed and ground by the rolling and grinding action of the grinding roller. At the same time, the hot air introduced from the bottom of the mill blows up the ground coal powder, forming a gas-solid two-phase flow. In the rising process, the pulverized coal is graded through the separator, and the qualified pulverized coal is discharged from the mill with the airflow and enters the subsequent pulverized coal collection system; Unqualified coarse powder is returned to the grinding disc under the action of gravity for further grinding.
Specifications And Technical Parameters Of HVM Vertical Mill
| 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
Small footprint: Compared with traditional ball mills, vertical coal mills have a more compact structure and can reduce the footprint by about 30% -50%, effectively saving factory space and construction costs.
High grinding efficiency: Using the material bed grinding principle, the material is squeezed and ground between the grinding disc and the grinding roller, resulting in high energy utilization. The grinding efficiency is about 30% -50% higher than that of a ball mill, which can reduce electricity consumption.
Strong drying ability: It can use kiln exhaust gas or other hot air as a drying medium to dry coal while grinding, and can process coal with high moisture content. Generally, it can dry coal with moisture content of about 15% -20%, and specially designed mills can even process coal with moisture content as high as 25% -30%.
Good product quality: Through precise classification by the separator, coal powder with uniform particle size and large specific surface area can be produced, which is beneficial for improving coal combustion efficiency and reducing energy consumption.
Low operation and maintenance costs: The wear of grinding rollers and grinding discs is relatively uniform, with a long service life, easy maintenance, short downtime, and can effectively reduce maintenance costs and losses caused by production interruptions.
Application Area
Power industry: used in thermal power plants to grind coal into powder for efficient combustion in boilers, generating steam to drive steam turbines for power generation.
Cement industry: In the cement production process, vertical coal mills are used to grind coal and provide fuel for cement kilns to meet the heat required for cement clinker calcination.
Chemical industry: Some chemical production processes require the use of coal powder as raw material or fuel. Vertical coal mills can grind coal into suitable particle sizes to meet the requirements of chemical processes.
Product Tags:
|
|
Dry Grinding Vertical Coal Mill Engineer Guide Installation for Industrial Applications Images
|
