A
coal-fired power station produces electricity, usually for public
consumption, by burning coal to boil water, producing steam which drives
a steam turbine which turns an electrical generator.
Coal is a relatively cheap fuel with some of the largest deposits in politically stable regions (China, India and the US) thus generally offering a more stable supply than natural gas and oil, the largest deposits of which are located in the more politically volatile Persian Gulf.
Coal is a relatively cheap fuel with some of the largest deposits in politically stable regions (China, India and the US) thus generally offering a more stable supply than natural gas and oil, the largest deposits of which are located in the more politically volatile Persian Gulf.
Why a Coal-fired power plant?
Coal-fired power plants are a proven, reliable and efficient way to generate electricity, and are critical to meeting power-grid demand. The basic construction of single reheat large steam turbines for coal-fired power plants was established over 30 years ago. This construction, designed originally for operating at conventional steam conditions, has achieved very high standards of reliability and operability through continuing development and feedback of operating experience. The same basic design therefore provides a very sound reference base for high output applications at supercritical operating conditions taking advantage of advanced materials and design refinements. Advanced pulverized-coal-fired power plants are well suited for mid-range power supply and support the grid system to avoid blackouts. Coal's value as a power plant fuel is greatly enhanced by its ability to supply power during peak power demand -- as base power -- and off-peak power demand.Diagram of a typical coal-fired thermal power station
| 1. Cooling tower 2. Cooling water pump 3. Transmission line (3-phase) 4. Unit transformer (3-phase) 5. Electric generator (3-phase) 6. Low pressure turbine 7. Boiler feed pump 8. Condenser 9. Intermediate pressure turbine | 10. Steam governor valve 11. High pressure turbine 12. Deaerator 13. Feed heater 14. Coal conveyor 15. Coal hopper 16. Pulverized fuel mill 17. Boiler drum 18. Ash hopper | 19. Superheater 20. Forced draught fan 21. Reheater 22. Air intake 23. Economizer 24. Air preheater 25. Precipitator 26. Induced draught fan 27. Chimney Stack |
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