Coal Power Point

8/3/2019 Coal Power Point

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Environmental Hazards of Coal

Burning Power Plants

Delfin M. Herrera Jr.

BSEE 5-1


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Although coal provides electricity

for our homes, the burning of coal

in power plants is a major causeof environmental pollution and

global warming.


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Global Warming due to Coal Combustion

Carbon dioxide emissions are the

essential outcome of coal combustion in

power plants.


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Acid Deposition Due to Coal Burning

Combustion of coal in power plants

converts them to sulfur and nitrogen

oxides respectively. These oxides, uponreaction with water in the atmosphere,

result in precipitation of acid, sometimes

also called acid rain.


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Particulate Matter and Ground-

Level Ozone The coal-fired power plants release solid

and liquid particles that

remain suspended in the air and appear inthe form of smog

(combination of smoke and fog)


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Mercury Emissions from Coal Burning

Most coal-fired power plants are major

mercury emitters;

mercury is present in coal in small tracesand is released to the

atmosphere during combustion.


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How can we reduce pollution from

coal-fired power plants? 'Clean coal technology' describes a new

generation of energy processes, some

currently available and others beingdeveloped, which have the ability to

sharply reduce air emissions and other

pollutants.


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Among the key options under development

for use alone or in combination are:

- Optimising existing plants so they reduceemissions and increase the amount of electricityproduced with the same amount of coal.

- Continuing to develop and refine best-availablecombustion technology, including circulatingfluidised-bed (CFB) technology, which includessupercritical and ultra supercritical combustion.

This option may also include burning biomass asa fuel, thus reducing the level ofCO2 emissions,and oxy-combustion for collecting CO2-rich fluegas.


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CFB

ACirculating Fluidized Bed is a relatively new and evolvingtechnology that has become a very efficient method of generatinglow-cost electricity while generating electricity with very lowemissions and environmental impacts.

In a Circulating Fluidized Bed combustion process, crushed coal ismixed with limestone and fired in a process resembling a boilingfluid. The limestone removes the sulfur and converts it into anenvironmentally-benign powder that is removed with the ash.

Fluidized bed boilers are capable of burning a wide range of fuelscleanly, including biomass fuels such as wood waste.


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- Gasification - turning coal into a gas and

removing impurities from the coal gas

before it is combusted.

- Carbon capture and storage (CCS) -

capturing the carbon dioxide from the flue

gas and storing it underground or reusing

it


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Etc.


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Coal Power Point