1. Mining and Transportation: Coal is extracted from the ground through various mining methods (surface, underground) and transported to the power plant.
2. Combustion: Coal is pulverized into a fine powder and fed into a boiler, where it is burned at high temperatures. This combustion releases heat energy.
3. Water Heating and Steam Generation: The heat from coal combustion is used to heat water in the boiler, converting it into steam. This steam is under high pressure and temperature.
4. Steam Turbine: The high-pressure steam is directed towards a steam turbine, a device with rotating blades. The steam's kinetic energy pushes the blades, causing them to rotate.
5. Generator: The rotating turbine shaft is connected to a generator, which converts the mechanical energy of the turbine into electrical energy.
6. Electricity Transmission: The generated electricity is then transmitted through high-voltage power lines to homes, businesses, and industries.
7. Waste Products: Coal combustion produces various waste products, including ash, flue gas, and water. These waste products need to be treated and disposed of responsibly.
Here's a visual summary:
[Coal] → [Combustion] → [Water Heating] → [Steam Generation] → [Steam Turbine] → [Generator] → [Electricity]
Key points to remember:
* Coal-fired power plants are a major source of electricity worldwide, but they also contribute significantly to air pollution and greenhouse gas emissions.
* The burning of coal releases various harmful pollutants into the atmosphere, including sulfur dioxide, nitrogen oxides, and particulate matter.
* The use of cleaner coal technologies and carbon capture and storage technologies can help reduce the environmental impact of coal-fired power plants.
Alternatives to Coal:
With growing concerns about climate change and air pollution, there is a global shift towards renewable energy sources such as solar, wind, and hydro power. These sources offer a cleaner and more sustainable way to generate electricity.
