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Coal Fired Power Generation

and Emission Controls

Module 2:

Conventional Power Generation II

Lecture 8

Coal Fired

Power GenerationNanticoke

• In Ontario, the Nanticoke power station (opposite) supplies about one-fifth of the province's energy requirements on a given day.

• Ontario Power Generation says the station provides enough electricity on an annual basis to power as many as 2.5 million homes.

Nanticoke coal-fired power plant on Lake Erie.

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Power distribution to/from

the Nanticoke Power Plant

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Coal is often brought by rail or boat to the power plant site

where it is moved by conveyor belt into the power plant.

The Nanticoke coal-fired power plant.Typical boiler (steam-generator) for

large coal fired power plant.

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Air heater used to transfer heat from

the outgoing exhaust gas to the

intake combustion air.

The air heater pre-heats the

combustion air and improves plant

efficiency.

The unit consists of a large rotating

basket, half the area located in the

hot gas stream and half located in the

cold intake air stream.

Heat removed by the rotating basket

is carried into the cold air stream

where it is used to preheat the intake

air. Flexible seals next to the basket

minimize gas/air leakage between the

fluid streams.

Air Pre-heater

6

Emissions Controls

Rogan, J. Byers, Comparison of Current Technology Options for Power Generation in North America,

Presented at Global Climate Change Forum, Public Utilities Commission of Ohio, 1996, Columbus, Ohio, U.S.A.

Nanticoke tops pollution list

Feb 12 2004 12:50 PM EST

CBC News

The Nanticoke power generating plant is Ontario's single worst polluter when it comes to small particulate matter released into the air, a new study says.

The coal-fired plant on the shore of Lake Erie accounts for 14 per cent of such matter released in the province each year, the Ontario Clean Air Alliance says.

"Small particulate matter are a prime cause of asthma attacks, heart attacks and bronchitis, " said OCAA chair Jack Gibbons. "Nanticoke is the number-one source in Ontario of these pollutants."

Gibbons says this study once again highlights the health dangers of coal-burning plants.

The McGuinty government has promised to phase out all coal generating stations by the year 2007.

A spokesperson for Ontario Power Generation noted that the plant meets all current provinical guidelines for emissions.

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The absorber module

is a counter-current design.

The slurry is sprayed

downward from a series

of headers and nozzles

and scrubs the flue gas as

it moves upward through

the tower. Continuous pH

monitoring is used to

control the addition of

fresh reagent. Density is

also monitored continuously

to control the addition of

make-up water to compensate

for evaporative losses.

The gas rises through the

gas distribution tray, contacting

a froth of slurry.

Flue Gas SO2 Scrubbers

Emissions Controls

Emissions Controls

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Emissions Controls

Emissions Controls

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Ontario’s long range plan to close coal fired

power plants (see www.ieso.ca)

"Today I am pleased to announce that the United States

will sponsor a $1 billion, 10-year demonstration project to

create the world's first coal-based, zero-emissions

electricity and hydrogen power plant..."

President George W. Bush

February 27, 2003

Artist’s concept

US banks on “Clean Coal” technology for future

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Exercise: Locate the components in the list on the diagram