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1998 nitrogen oxides
<br />emissions by thousands
<br />of tons:
<br />Duka Power 9
<br />Belews Geek ~
<br />CP&L • 51.8
<br />Raxhoro k
<br />Duke Power ~ $ b
<br />Morsholl '
<br />CP&L ~ 12.6
<br />Mayo
<br />Duke Pewer ~ 9 ~
<br />Allen
<br />Duka Power t
<br />Oiltside #ti 9.6
<br />CP&~e ~ 8.9
<br />CP&L ~ 7.4
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<br /> ~~ The coal rs shipped to
<br /> North Carolina via rail
<br /> ~""•~ from West Virginia and
<br /> } ~~' other central Appalachic
<br /> s?s: states
<br />A crackdown on coal
<br />to cleax the air
<br />Burning coal has provided abundant electricity in
<br />North Carolina for decades. It also produces coal
<br />smoke that contains dust, sulfur dioxide, carbon
<br />dioxide, mercury and other potentially harmful
<br />substances.
<br />Gov. Jim Hunt has proposed cutting the emissions
<br />of one of those pollutants -nitrogen oxides -
<br />from 14 coal-fired power plants owned by Carolina
<br />Power &• Light and Duke Power. The pollution
<br />~k~&e b.s Yt~ ~`~ '~ ~s~ ~:t„ ~ ~~ ,,~ ~,~= contributes to the urban smog problemthat violated
<br />~" `"` ~'' ~ ~ •~' ` ' health standards on 6$ days this year.
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<br />1948 nitrogen oxtdes et
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<br />Turning coal into elecirrit:iity ,„,, ,,. `' ~ 3'~2 r , ,~;,~, '~"~~ ~°~` ,;==
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<br />The coal is dumped into a pipe (D) and to burners that ignite The power rs transmitted to'`~~ %y, y~'~,r~ ~'~~ ~~ "" •
<br />t .]3)CFuL :,i, ,r~ ~,~i ~
<br />hopper and brought by conveyor the fuel mixture. (E) The hot air consumers through power ~ ,~ •, .~ ~'"~>~~,~,,
<br />belt to a bin that is emptied#rom enters the boiler in pipes (F) where lines and transformers. ~S~ '~ ~ ~ ,~'~ ~~
<br />below. it heats the water to 1,000 de tees. ~ "~ ~~ '~ '
<br />(A) The coal feeds into a The steams turns o turbine, 4 ~ 8) CI'F L ~ K -
<br />pulverizer where the coal~is turned activating a generator. ~~ ~ ~ fi`'`
<br />into the consistency of talcum ~ ~rfi~y~ ~ ~;;; 3
<br />pThe po order is mixed with air (C). ~ ;x' ~`~ ~~ ~~, ~ .t ~Mx
<br />The powder is blown through a ~~, ,, : "ttu ~ ss~' •
<br />Once the cool is burned, the exhaust is cooled and the
<br />' Pulverizer soot is electrically charged in o precipitator. That
<br />enables the plant to remove the soot before the gas is
<br />_" ~ released from smokestacks into the air.
<br />When sunlight heats two common Nitrogen oXideS
<br />air pollutants -nitrogen oxides and VOC Sources SoUrCes
<br />•volatile organic compounds (VOCs) - --
<br />- ground-level ozone is formed by • Cars and trucks • Cars
<br />a chemical reaction in the air. • Gasoline fumes • Power plants
<br />The sun "cooks" these fumes and • Solvents • Industrial
<br />gases, transforming them into • Dry cleaners boilers
<br />ground-level ozone, a harmfuPgas. • Small engines.
<br />The red arrows above represent • Trees
<br />the nitrogen oxides. The orange
<br />~ arrows represent VOCs. ROBERT W. AHRENS /The News & Observer
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