Ⅰ.Main Process

1. Coal crushing

• ​Purpose: To break the lump coal into the particle size suitable for pulverized coal grinding
• Equipment: Traditionally, impact crushers are used, but modern processes prefer to use hammer crushers, which quickly impact the coal through a hammer head composed of multiple blades, improving crushing efficiency and reducing dust generation

2. Coal Grinding

• Purpose: The coal particles are further refined to improve the combustion efficiency of pulverized coal
• Equipment: The ball mill is used in the unified process, but there are problems of high wear and high energy consumption. The modern pulverized coal grinding process uses a mill, which grinds the coal to the required fineness through the relative movement of the roller and the mill roller. At the same time, an efficient classification device is introduced to send the particles that do not meet the fineness requirements back to the mill for re-grinding, which improves the efficiency of pulverized coal grinding.

3. Drying of Pulverized Coal

• Purpose: remove the humidity inside the pulverized coal and increase the combustion efficiency of the pulverized coal.
• Equipment: The traditional drying method uses coal-fired furnace, but the energy consumption is high and the pollution is big. In modern technology, hot blast stove and pulverized coal separation device are used to remove the water in the pulverized coal through hot air conduction, and the pulverized coal separation device is used to separate the pulverized coal containing large particles, which improves the efficiency of drying.

4. Separation of gas and solid material

• Purpose: The dust and exhaust gas in the pulverized coal are separated to avoid pollution to the environment
• Equipment: The traditional method uses cloth bag dust collector, but the dust removal efficiency is limited and the operation and maintenance cost is high. The modern process uses electric precipitator and electrostatic precipitator to separate the dust through the guiding effect of the electric field, and uses the principle of static electricity to carry out directional movement of the dust, which improves the efficiency of gas-solid separation.

Ⅱ. Advantages and benefits

1. Improve the utilization rate of pulverized coal: through fine crushing, grinding and grading treatment, the pulverized coal particles with uniform particle size and moderate fineness can be obtained, thus improving the combustion efficiency and utilization rate of pulverized coal.

2. Reduce energy consumption: The use of advanced equipment and processes, such as mills, hot blast stoves and electrostatic precipitators, can significantly reduce energy consumption in the pulverized coal production process

3. Reduce environmental pollution: Through effective dust control and waste gas treatment measures, such as pulverized coal separation devices and electric dust precipitators, dust emissions and waste gas pollution in the production process of pulverized coal can be greatly reduced.

4. Improve economic benefits: Efficient pulverized coal production process can not only improve the output and quality of pulverized coal, but also reduce production costs and energy consumption, thereby increasing the economic and social benefits of coal mines.

Ⅲ. Future development trend