A pulverizer (also called a coal mill) is a mechanical device used to grind coal into a fine powder for combustion in coal-fired power plants. The powdered coal (pulverized coal) improves combustion efficiency by increasing the surface area exposed to oxygen.
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How a Coal Pulverizer Works:
1. Crushing: Raw coal is fed into the pulverizer and crushed between grinding rollers/bowls and a rotating table.
2. Drying: Hot air (from the boiler) dries the coal while grinding.
3. Classification: Ground coal is separated by particle size—finer particles are carried to the boiler, while larger particles are reground.
4. Transport: The pulv.jpg)
zed coal is blown by air into the furnace for combustion.
Uses of Pulverized Coal:
1. Power Generation: Primary fuel in thermal power plants for steam generation.
2. Industrial Boilers: Used in cement, steel, and paper industries for high-efficiency heating.
3. Blast Furnaces: Injected into furnaces to reduce coke consumption in steelmaking.
4. Combustion Systems: Used in fluidized bed boilers and gasification processes.
Advantages of Pulverized Coal:
– Higher combustion efficiency due to increased surface area.
– Better temperature control in boilers.
– Reduced emissions with advanced combustion techniques (e.g., low-NOx burners).
Types of Coal Pulverizers:
– Ball-Tube Mills
– Vertical Spindle Mills (Bowl Mill, Roller Mill)
– Impact Mills (Hammer Mill, Beater Mill)
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