can plsplz make it by today pls
2007-02-04 20:09:30 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Coal is not generated in coal power stations. Coal is mined from the earth and delivered to power stations. Coal is used to generate power by being burned to make heat which boils water to make steam which turns a turbine which drives an electric generator.
2007-02-04 20:14:48 · answer #1 · answered by gp4rts 7 · 0⤊ 0⤋
Coal is not GENERATED in a coal power station, it's burned to create the steam to drive the turbines that generate electricity.
2007-02-05 04:14:40 · answer #2 · answered by MICHAEL M 2 · 0⤊ 1⤋
Coal is a fossil fuel extracted from the ground by coal mining, either underground mining or open-pit mining (surface mining). It is a readily combustible black or brownish-black rock. Coal is a sedimentary rock, but the harder forms, such as anthracite coal, can be regarded as metamorphic rocks because of later exposure to elevated temperature and pressure. It is composed primarily of carbon along with assorted other elements, including sulfur. Often associated with the Industrial Revolution, coal remains an enormously important fuel. It is the largest single source of fuel for the generation of electricity world-wide, and a vital component in the reduction of iron ore.
When coal is used for electricity generation, it is usually pulverized and then burned in a furnace with a boiler. The furnace heat converts boiler water to steam, which is then used to spin turbines which turn generators and create electricity. The thermodynamic efficiency of this process has been improved over time. "Standard" steam turbines have topped out with about 35–40% thermodynamic efficiency for the entire process, but the emergence of supercritical turbines running at extremely high temperatures and pressures has led to efficiencies of 46%, with further increases in temperature and pressure offering potential for even higher efficiencies.Approximately 40% of the world electricity production uses coal, and the total known deposits recoverable by current technologies are sufficient for 300 years' use at current usage levels, although maximal production could be reached within decades
2007-02-05 04:42:15 · answer #3 · answered by Einstein 2 · 1⤊ 1⤋
Coal is not generated, it comes out of mines and is then burned in the powerstation, usually it gets crushed first!
2007-02-05 04:13:18 · answer #4 · answered by Christy R 1 · 1⤊ 0⤋
the coal heats water, the water's steam turns a turbine connected to generators
2007-02-05 04:13:26 · answer #5 · answered by Tom O 2 · 0⤊ 1⤋