Steel Metallurgy Vertical Roller Mill Efficient Coal Mill In Power Plant

Vertical Roller Mill Manufacturers Efficient High Quality Coal Mill In Power Plant
Product Introduction:
Coal vertical mill can be widely used in industries such as cement, electricity, steel, metallurgy, etc. Due to its special process and structure, the coal vertical mill has low dust and noise during the production process, and the produced coal powder has efficient grading and excellent combustion performance. The HVM series coal vertical mill produced by Hefei Hengcheng has a simple process, compact equipment, and a coal powder fineness of up to 80% μ MR 3%, with stable fineness and uniform particle size.
Advantages of vertical grinding for producing fly ash
1. The output of the vertical mill is very large, and depending on the model, it can be easily increased to 10-150 tons per hour, which can fully meet the needs of large-scale coal refining projects.
2. Adaptability to opposite coal mill varieties: using hydraulic loads and storage devices as buffer zones; The inside of the mill is dry and can crush coal with high moisture content.
3. The energy consumption of vertical grinding machine is very low: This grinding machine uses grinding rollers directly grinding on the grinding disc, and its energy consumption is very small, which can save 30% -40% of energy consumption compared to ball mills.
4. The vertical grinder has good drying performance: the hot air inside comes into direct contact with the material, resulting in good drying performance. It can save a drying equipment, land area, energy, and adjust the temperature of the hot air, making it easy to handle materials with various moisture contents.
Working principle:
The LM vertical grinding machine is mainly composed of a separator, grinding roller device, grinding disc device, pressurization device, reducer, electric motor, housing, and other parts.
During operation, the electric motor drives the grinding disc to rotate through the reducer, while hot air enters the vertical mill through the air inlet. The material falls better on the grinding disc from the discharge port. Due to centrifugal force, the material moves better from the grinding disc towards the edge of the grinding disc. When passing through the annular groove on the grinding disc, it is crushed by the grinding roller, and the crushed material continues to move towards the edge of the grinding disc until it is carried away by the airflow at the wind ring, And the large particles of material fall onto the grinding disc and continue to be crushed. When the material in the airflow passes through the upper separator, under the action of the guide vanes, the coarse material falls from the cone bucket onto the grinding disc, and the fine powder is discharged from the mill along with the airflow and collected by the system's dust collector. The collected powder is the product produced by the vertical mill. The material is dried during contact with the gas in the shell to achieve the required dryness and humidity of the product. By adjusting the angle of the guide vanes of the separator (not adjustable for small vertical mills) and the speed of the separator rotor, the required thickness of the product can be achieved.

Parameter Table of Coal Vertical Mill

 
Art Introduction
The raw coal is sieved through a grid screen in the raw coal yard and falls onto a belt conveyor. After being removed by an electromagnetic iron remover, the belt conveyor sends the raw coal to the raw coal bin for storage. After the pulverization system has been started, open the rod valve at the bottom of the raw coal bin, start the sealing metering tape to feed the coal vertical mill, and the raw coal enters the coal vertical mill for drying and grinding.
The hot air or cement production line exhaust gas from the hot air stove is drawn by the system fan and enters the coal vertical mill. After sufficient heat exchange with the raw coal being ground in the mill, the coal powder is picked up and sorted at the powder selection machine. Coarse coal powder with poor fineness is re ground on the grinding disc for grinding. Qualified coal powder is collected by the explosion-proof gas box pulse dust collector with the airflow and discharged into the coal powder bin through the grid wheel. The impurities in the raw coal, such as some coal gangue, metal blocks, etc., are discharged from the mill through the air ring and slag discharge port.

Product advantages
1. The grinding roller adopts forced lubrication with thin oil, which extends the service life of the bearing by more than 2.5 times
Generally, the roller bearings of vertical mills are lubricated with grease. However, due to the high moisture content of the raw coal, improper operation can easily cause the temperature of the roller bearings to be too high, leading to the evaporation and deterioration of the lubricating grease, which affects the service life of the bearings. Therefore, the HVM coal vertical mill adopts forced lubrication and cooling with thin oil on the grinding rollers, greatly increasing the service life of the bearings (usually by more than 2.5 times).
2. The fineness of the finished product can reach 80 μ MR3%
The HVM series coal vertical mill adopts a new type of high-efficiency powder selection machine, which has high classification efficiency, large adjustment space, and a powder selection fineness of 0.08 mm and less than 3% sieve residue, which can meet the fineness requirements of most low-quality coal or anthracite powder grinding in cement production lines.
3. The power consumption of powder grinding is 20-40% lower than that of traditional air swept coal mills
Compared with traditional wind swept coal mills of the same scale, the power consumption of HVM series coal vertical mills in powder grinding is 20% to 40% lower, especially when the moisture content of the raw coal is high, the power savings are greater.
4. Can dry raw coal with moisture content up to 10%
This vertical mill adopts an air sweep operation, which can grind and dry raw coal with moisture content up to 10% by adjusting the temperature and air volume of the incoming air. High air volume is used to meet the high moisture drying requirements.
5. The noise level is only 80-85dB (A sound level)
The noise level of the vertical mill is only 80-85 dB (A sound level), which is 20-25 dB (A sound level) lower than that of the tube mill. The system operates under negative pressure, without dust flying, and the operating environment is clean.
6. The infrastructure area is only about 60% of that of traditional wind swept ball mills
The vertical mill integrates five processes: grinding, drying, powder selection, conveying, and collection. The process is simple, the layout is compact, and the floor area is about 60-70% of the pipe mill system, and the building area is about 50-60% of the pipe mill system.

Engineering Cases
Engineering Design and Equipment Manufacturing Supply of HVM2800M Vertical Pulverized Coal Preparation System
Processing material type: bituminous coal
Capacity: ≥ 80t/h
Product fineness: 200 mesh, 85% pass