On Monday, April 11, 2016 12:22 PM, Muhammad Ali <manik195709@yahoo.com> wrote:
On Monday, April 11, 2016 12:21 PM, Muhammad Ali <manik195709@yahoo.com> wrote:
Coal plays a vital role to generate electricity . About 45% of world electricity generated from "Coal Power Plan" . In Bangladesh so called 'Environmentalist' are trying to misguide general people in the name of 'environmental hazard' about coal plant . They are doing this only to fulfill their "Hidden Agenda" . Please read the article below about the usefulness of coal power plant in electrification :
Coal 's role in electricity generation worldwide
Modern life is unimaginable without electricity. It lights houses, buildings, streets, provides domestic and industrial heat, and powers most equipment used in homes, offices and machinery in factories. Improving access to electricity worldwide is critical to alleviating poverty.
Coal plays a vital role in electricity generation worldwide. Coal-fired power plants currently fuel 41% of global electricity and, in some countries, coal fuels a higher percentage of electricity.
How is coal converted to electricity?
Steam coal, also known as thermal coal, is used in power stations to generate electricity. Coal is first milled to a fine powder, which increases the surface area and allows it to burn more quickly. In these pulverised coal combustion (PCC) systems, the powdered coal is blown into the combustion chamber of a boiler where it is burnt at high temperature (see diagram). The hot gases and heat energy produced converts water – in tubes lining the boiler – into steam.
The high pressure steam is passed into a turbine containing thousands of propeller-like blades. The steam pushes these blades causing the turbine shaft to rotate at high speed. A generator is mounted at one end of the turbine shaft and consists of carefully wound wire coils. Electricity is generated when these are rapidly rotated in a strong magnetic field. After passing through the turbine, the steam is condensed and returned to the boiler to be heated once again.
The electricity generated is transformed into the higher voltages (up to 400,000 volts) used for economic, efficient transmission via power line grids. When it nears the point of consumption, such as our homes, the electricity is transformed down to the safer 100-250 voltage systems used in the domestic market.
IN SUMMARY:
- Coal & electricity
- High efficiency
- Coal technology news
There's never been a country that has developed with intermittent power"
Jim Yong Kim
World Bank President
High efficiency
Efficiency improvements
Improvements continue to be made in conventional PCC power station design 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 power station. Efficiency gains in electricity generation from coal-fired power stations will play a crucial part in reducing CO2 emissions at a global level. A one percentage point improvement in the efficiency of a conventional pulverised coal combustion plant results in a 2-3% reduction in CO2 emissions.
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