Total World Electricity Generation by Fuel (2009)
Modern life is unthinkable without electricity. Lights houses, buildings, streets, provides domestic and industrial heat and power more computers used in homes, offices and machinery in factories. Improving access to electricity worldwide is key to reducing poverty.
How coal is converted into electricity?
Steam coal, also known as thermal coal used in power plants to generate electricity.
The coal is first crushed to a fine powder, which increases the surface area and allowing it to burn faster. In these systems pulverized coal combustion (PCC), powdered coal is blown into the combustion chamber of a boiler where it is burned at high temperature (see diagram below). The hot gases and heat energy produced converts water - in cladding tubes of the boiler - steam.
The high pressure steam is passed to a turbine which contains thousands of blades of the propeller-like. The steam drives these blades causing the turbine shaft to rotate at high speed. A generator mounted on one end of the turbine shaft and has wound wire coils carefully. Electricity is generated when these are rapidly rotating in a strong magnetic field. After passing through the turbine, the steam is condensed and returned to the boiler to be heated again.
The electricity generated is transformed into the higher voltages (up to 400,000 volts) used for economical and efficient transmission through powerline networking. As you near the point of consumption, such as our homes, electricity is transformed to the safer 100-250 voltage systems used in the domestic market.
Improvements continue to be made in the design of conventional PCC power plant and new combustion technologies are being developed. These allow more electricity to be produced from less coal - known as improving the thermal efficiency of the plant. Increased efficiency in generating electricity from coal power plants will have a crucial role in reducing CO2 emissions globally.
Efficiency improvements include cost effective and shorter delivery times for the actions to reduce emissions from coal-fired power generation. This is particularly true in developing countries, where there efficiency of power plants are generally less use and coal in power generation is increasing. Not only coal-fired power plants more efficient emit less carbon dioxide per megawatt (MW), but are also suitable for retrofitting with CO2 capture systems.
Improving the efficiency of pulverized coal power plants has been the focus of major efforts by the coal industry. There is ample scope for significant improvements in efficiency as the existing fleet of power plants are replaced in the next 10 to 20 years with new efficiency supercritical and ultra-supercritical plants taller, and through wider use systems integrated gasification combined cycle (IGCC) for power generation.
A one percentage point improvement in the efficiency of a conventional pulverized coal combustion plant results in a reduction of 2-3% in CO2.
Modern life is unthinkable without electricity. Lights houses, buildings, streets, provides domestic and industrial heat and power more computers used in homes, offices and machinery in factories. Improving access to electricity worldwide is key to reducing poverty.
How coal is converted into electricity?
Steam coal, also known as thermal coal used in power plants to generate electricity.
The coal is first crushed to a fine powder, which increases the surface area and allowing it to burn faster. In these systems pulverized coal combustion (PCC), powdered coal is blown into the combustion chamber of a boiler where it is burned at high temperature (see diagram below). The hot gases and heat energy produced converts water - in cladding tubes of the boiler - steam.
The high pressure steam is passed to a turbine which contains thousands of blades of the propeller-like. The steam drives these blades causing the turbine shaft to rotate at high speed. A generator mounted on one end of the turbine shaft and has wound wire coils carefully. Electricity is generated when these are rapidly rotating in a strong magnetic field. After passing through the turbine, the steam is condensed and returned to the boiler to be heated again.
The electricity generated is transformed into the higher voltages (up to 400,000 volts) used for economical and efficient transmission through powerline networking. As you near the point of consumption, such as our homes, electricity is transformed to the safer 100-250 voltage systems used in the domestic market.
Efficiency Improvements
Improvements continue to be made in the design of conventional PCC power plant and new combustion technologies are being developed. These allow more electricity to be produced from less coal - known as improving the thermal efficiency of the plant. Increased efficiency in generating electricity from coal power plants will have a crucial role in reducing CO2 emissions globally.
Efficiency improvements include cost effective and shorter delivery times for the actions to reduce emissions from coal-fired power generation. This is particularly true in developing countries, where there efficiency of power plants are generally less use and coal in power generation is increasing. Not only coal-fired power plants more efficient emit less carbon dioxide per megawatt (MW), but are also suitable for retrofitting with CO2 capture systems.
Improving the efficiency of pulverized coal power plants has been the focus of major efforts by the coal industry. There is ample scope for significant improvements in efficiency as the existing fleet of power plants are replaced in the next 10 to 20 years with new efficiency supercritical and ultra-supercritical plants taller, and through wider use systems integrated gasification combined cycle (IGCC) for power generation.
A one percentage point improvement in the efficiency of a conventional pulverized coal combustion plant results in a reduction of 2-3% in CO2.
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