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COMPARISON BETWEEN NUCLEAR POWER PLANTS AND COAL POWER PLANT
Transcript of COMPARISON BETWEEN NUCLEAR POWER PLANTS AND COAL POWER PLANT
Nuclear power is energy contained in atoms. This energy can be released as heat from a chain reaction in a radioactive element such as uranium.
A nuclear power station turns the nuclear energy in uranium atoms into electrical energy that can be used in homes and businesses.
The nuclear power plant is a thermal power station in which the heat source is a nuclear reactor. As is typical in all conventional thermal power stations the heat is used to generate steam which drives a steam turbine connected to a electric generator which produces electricity.
Nuclear power stations operate in 31 countries. China has 28 new reactors under construction, and there are also a considerable number of new reactors being built in South Korea, India, and Russia.
The cancer risk depends on the amount of radiation, the type of radiation, and the parts of the body exposed. Accidents that cause severe damage to nuclear power plants may result in the release of radioactive materials into the environment and associated exposures to ionizing radiation.
In many countries, plants are often located on the coast, in order to provide a ready source of cooling water for the essential service water system. As a consequence the design needs to take the risk of flooding and tsunamis into account.
POWER PLANTS AND
Nuclear PoWER PLANTS
COAL POWER PLANTS
A fossil fuel power station burns fossil fuels such as coal, natural gas or petroleum (oil) to produce electricity. Central station fossil-fuel power plants are designed on a large scale for continuous operation. In many countries, such plants provide most of the electrical energy used.
1. Heat is created
Before the coal is burned, it is pulverized to the fineness of talcum powder. It is then mixed with hot air and blown into the firebox of the boiler. Burning in suspension, the coal/air mixture provides the most complete combustion and maximum heat possible.
2. Water turns to steam
Highly purified water, pumped through pipes inside the boiler, is turned into steam by the heat. The steam reaches temperatures of up to 1,000 degrees Fahrenheit and pressures up to 3,500 pounds per square inch, and is piped to the turbine.
3. Steam turns the turbine
The enormous pressure of the steam pushing against a series of giant turbine blades turns the turbine shaft. The turbine shaft is connected to the shaft of the generator, where magnets spin within wire coils to produce electricity.
4. Steam turns back into water
After doing its work in the turbine, the steam is drawn into a condenser, a large chamber in the basement of the power plant. In this important step, millions of gallons of cool water from a nearby source (such as a river or lake) are pumped through a network of tubes running through the condenser. The cool water in the tubes converts the steam back into water that can be used over and over again in the plant.
The cooling water is returned to its source without any contamination, and the steam water is returned to the boiler to repeat the cycle.
Coal-burning plants are some of the world's worst industrial polluters, producing approximately one-third of our carbon dioxide (CO2, a major contributor to global warming), 40% of our mercury (highly toxic if ingested or inhaled), one-quarter of our nitrogen oxide and two-thirds of our sulfur dioxide. The Environmental Protection Agency (EPA) contends that sulfur dioxide promotes heart disease and asthma, while nitrogen oxides destroy lung tissue.
Coal Power-Plant Pollution
FACTS ON NUCLEAR ENERGY
-Every 18 to 24 months, a power plant must shut down to remove its spent uranium fuel, which becomes radioactive waste.
-13% of the world’s electricity comes from nuclear power plants that emit little to no greenhouse gases.
-Nuclear energy is being used in more than 30 countries around the world and even powers Mars rovers.
-Nuclear power facilities can produce energy at a 91% efficiency rate 24/7, while maintaining the method with the lowest emissions.
Russian atomic energy agency Rosatom has a preliminary deal to construct first nuclear power plant in Egypt.
March 2nd, 2015
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