A coal mill, also known as a pulverizer, is used to grind coal into a fine powder for use in thermal power plants. Here's a general outline of how it works:
Raw Coal Inlet: Raw coal from the coal storage area is fed into the coal mill through a conveyor system.
Grinding: The raw coal is crushed by rollers or balls against a rotating horizontal grinding table. The grinding process reduces the coal to a fine powder, which is necessary for efficient combustion in the furnace.
Hot Air Circulation: Hot air, usually from the boiler exhaust, is passed through the mill. This hot air not only helps to dry the coal but also conveys the pulverized coal from the mill to the burner.
Separation: Inside the mill, a classifier sorts the coal particles by size. Larger particles are returned to the grinding table for further grinding, while the fine particles are carried by the air stream to the boiler.
Fuel Injection: The finely pulverized coal is blown into the boiler furnace where it combusts, releasing heat energy to produce steam for electricity generation.
Proper operation and maintenance of the coal mill are essential to ensure consistent fuel supply, efficient combustion, and reduced emissions in power plants.
