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# OAR Box 1778 Prepped by Ollie Stewart



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# US E %«W* 0 < * P. 2

* • II-B-1 4 UNITE D STATE S ENVIRONMENTA L PROTECTIO N AGENC Y WASHINGTON , D.C . 2046 0 

## JI M 2 4 

## 19 0 OFFIC E O F ENFORCEMEN T
Mr . Amasji t S . Gil l Genera l Electri c - Ga s Turbin e Divisio n On e Rive r Road Schenectady , Ne wYor k 1234 5 Dea r Mr . Gill : Thi s i s t o respon

d t o you r lette r o f Ma y19 , 1981 , requestin g a determinatio n o f the applicabilit yo f NSP S an d PS D t o stationar yga s turbine s convertin g fro m middl e distillate s t o natura l gas . Th e informatio n presente d in you r lette r indicate d tha t NO xan d SO 2 emission s wil l decreas e afte r the conversio n t o natura l ga s an

d hydrocarbons , C O an d particulat e emission s wil l eithe r remai n the sam e o r decrease . A s yo u correctl ypointe d ou t i n you r letter , th e NSP S woul d onl yappl yi f ther e i s a n increas e i n emission s o f a pollutan t t o whic h the standar d applies . Th e NSP S fo r ga s turbine s applie s onl yt o N0 X a n d S0 2 emissions . Sinc e th e conversio n fro mmiddl e distillat e fue l t o natura l ga s fo r th e turbine s i n questio n wil l caus e a decreas e in N0 Xan d SO o emissions , i t i s no t considere d a modificatio n a s define d i n 4 0 CF R 60.14(a) . Th e turbine s however , coul d be subjec t t o the NSP S i f the conversio n fall s unde r th e definitio n o f reconstructio n (Se e 4 0 CF R 60.15) . PS D revie wwoul d appl yt o a propose d modificatio n a t a n existin g majo r stationar ysourc e i f i t woul d caus e a significan t ne t increas e i n actua l emission s o f an yregulate d pollutant . I n the t cas e o f th e ga s turbin e conversion s outline d i n you r letter , PS D applicabilit yi s determine d b yevaluatin g an ychang e i n emission s rate s cause d b yth e conversions . Th e dat a containe d in you r lette r indicat e tha t th e emissio n rate s afte r th e conversio n wil l eithe r remai n constan t o r decrease . Actua l emission s coul d increas e onl yi f ther e i s a n increas e in th e productio n rat e o r hour s o f operation , bot h o f whic h ar e specificall yexemp t fro mPS D review . (Se e 4 0 CF R 52.21(b ) (2 ) (iii ) (f)) . Therefore , sinc e ther e wil l no t be an y increas e in emissio n rate s o r an ycreditabl e increase s in actua l emissions , th e conversio n o f th e ga s turbine s wil l no t b e subjec t t o PS D review .P. 3

I f yo u hav e an

yquestion s concernin g thi s determinatio n pleas e contac t Jane t Farell a o f m ystaf f a t 202-755-2564 . Sincerel yyours , Edwar d E . Reich , Directo r Divisio n o f Stationar y Sourc e Enforcemen t cc : Pete r Wyckof f Mik e Trutn aP. 4

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# GENERA L f * r.?CT3 l GA S TURBIN E DIVISIO N GENERA L ELECTRI C COMPANY . ON E RIVE R ROAD . SCHENECTADY . NE W YOR K1234 5 Telephon e (518 ) 385-413 1 OPERATIONA L PLANNIN G

Ma y 19 , 198 1 Copy : DonR . Goodwin , EP A Researc hTriangl e Pa r N C 2771 1 Mr . Edwar dReich , Directo r Divisio no f Stationar y Sourc e Enforcemen t Environmenta l Protectio nAgenc y 40 1 M Street , S.W . Washington , D.C . 2046 0 Dea r Mr . Reich : Stationar y Ga s Turbine s Convertin g fro

m Distillat e t o Natura l Ga s Th e Economi c Regulator y Administratio no f th e Departmen t o f Energ y grant s temporar y

publi c interes t exemptions , fro m th e prohibition s o f th e Fue l Us e Ac t o f 1978 , t o bur nnatura l ga s wher e suc hus e displace s th e us e o f middl e distillates , thereby

decreasin g ou r relianc e onimporte doil . Existin g ga s turbines * whic h4 o no t hav e built-injdual-fue. 1 capability , mus T instal l new

combustio nhardwar e s o tha t the y ca nburnnatura l ga s instea do f middl e distillates . Th e concern-arise s whettrer SiicrT a -conversio

n woul dbe calssifie da "modification " o r "majo r modification " and , therefore , subjec t th e ga s turbin e t o th e New Sourc e Performanc e Standard s (NSPS ) o r a Preventio no f Significan t Deterioratio n(PSD ) review . MODIFIE D Th e definitio no f modificatio ni s provide di n4 0 CF R6 0 as : 60.1 4 (a ) "Excep t a s provide dunde r paragraph s (e ) an d(f ) o f thi s section , an

y physica l o r operationa l chang e t o an y existin g facilit y

whic hresult s i na

nincreas e inth e emissio nrat e t o th e atmospher e o f an y pollutan t t o whic ha standar dapplie s shal l b e considere da modifi catio nwithi nth e meanin g o f Sectio nII I o f th e Act... " 60. 2 "'Standard 1 mean s a standar do f performanc e propose do r

promulgate dunde r thi s part. "P. 5

GENERAL ©ELECTRI C Pag e 2 NE W SOURC E PERFORMANC E STANDARD S (NSPS ) Hydrocarbons , carbo nmonoxid e an dparticulate s ar e specificall y exclude d fro m th e NSP S promulgate donSept . 10 , 1979 . Justificationfo r the exclusio n wa s provide dinth e Oc t 3 , 197 7 Federa l Registe r onpag e 53783 . "HC andCO emission s fro m stationar y

ga s turbine s operatin g a t pea kload ar e relativel y

lo w becaus e th e highe r the percentag e o f pea kloa da t whic ha turbin e operates , th e mor e efficien t th e combustio no f th e fuel . Ga s turbine s normall y

operat e a t 8 0 t o 10 0 percen t o f pea kloa dwit hH C emission s averagin g les s tha n5 0 pp m an dC O emission s averagin g les s tha n 50 0 pp m a t 1 5 percen t oxygen . HC an dCO emission s fro

m stationar y

ga s turbines , therefore , wer e no t selecte dfo r contro l b y standard s o f per formance. " "Particulat e emission s fro m stationar y

ga s turbine s dependo nthe as h conten t o f th e fue l an dar e minimal . Consequently , particulat e emission s fro m stationar y

ga s turbine s wer e no t selecte dfo r contro l b y standard s o f performance. " Sinc e ther e i s no standar dfo r CO , unburne dhydrocarbon s an dparticulate s unde r NSP S fo r stationar y ga s turbines , NSP S woul dno t appl y eve ni f ther e wa s a nincreas e inthe emissio nrat e o f thes e thre e pollutants . A s show n inth e attache dfou r tables , NO xan dS0 2 decrease , an

dCO , unburne dhydro carbon s an

dparticulate s remai nunchange do r decrease . PREVENTION

O F SIGNIFICAN T DETERIORATIO N (PSD ) PS Drevie w

woul dappl y

i f th e emission s increas e b y amount s greate r tha n d e minimi s levels . D e minimi s levels , show no npag e 5270 9 inth e Augus t 7 , 198 0 Federa l Register , are :
Carbo nMonoxid e Nitroge nOxide s Sulfu r Dioxid e Particulate s Volatil e Organi c Compound s Tons/Yea r 10 0 4 0 4 0 2 5 4 0 Equiv a

(876 0 len t lbs/hou r hours/year ) 22.8 3 9.1 3 9.1 3 5.7 0 9.1 3 Fo r thos e machine s whic har e no t restricte dt o a specifi c numbe r o f hour s o f operatio npe r yea r b

y anenforceabl e permi t condition , allowabl e emission s woul db e th e hourl y

emissio nrat e multiplie db y 876 0 hour s pe r year . Then , fo r PS Drevie w

purposes , ne t emission s increase s shoul db e evaluate dagains t thes e allowabl e emission s t o se e i f d e minimi s level s ar e exceeded .P. 6

GENERA L @ ELECTRI C Pag e 3

PSD (cont'd ) A s canb e see nfro

m the attache dfou r table s whic hprovid e uncontrolle d emissio nrate s fo r fou r G E ga s turbines , th e hourl y emission s rate s de creas e fo r NOxan

dS0 2 an dremai nunchange do r decreas e fo r CO , unburne d hydrocarbon s an

dparticulate s whe nth e fue l i s switche dfro m distillat e t o natura l gas . Therefore , thes e fou r ga s turbin e model s woul dno t requir e a PS D review whe nth e capabilit y

t o burnnatura l ga s i s adde dan dth e fue l i s switche d fro m distillat e t o natura l gas , and"allowable " emissions , a s oppose dt o actua l emissions , ar e no t exceede do na nannua l basis . You r officia l concurrenc e wit hou r interpretatio ni s requeste da t you r earlies t convenience . Sincerely , 

## Jwjyt' A.S V Gill , En v /e b Attach .

### I GENERA L @ ELECTRI C P. 7

. FUE L - LOA D - Output , Hea t Rate{LHV) , 1

kW Btu/kWh Fue l Consump.(LHV)IO 6 Btu/h r

NO x a s NO2 , *SOx a s S02 / Particulates , Hydrocarbons , (a s CH4) , CO , lbs/h r lbs/h r lbs/h r lbs/h r lbs/h r NATURA I

BAS E 74,40 0 10,69 0 795. 3

45 0 0 < 2 8 <1 2 < 2 1 P G 7 1 i GA S PEA K 80,50 0 10,64 0 856. 5

53 5 0 <3 0 < 1 2 < 2 1 0 1 E

DISTILLAT E BAS E 72,90 0 10,79 0 786. 6

79 0 25 4 2 8 1 2 2 1 PEA

K 78,80 0 1 C 75 0 847. 1

97 0 27 5 3 0 1 2 2 1



### •Distillat e Fue l wit h0.3 % Sulfu r b y Weight , Natura l Ga s Fue l Containin g n o Sulfur . Th e result s ar e base do

nfiel dan

dcombustio nlaborator y tes t dat afro mth e sam e o r simila r machine s an

dcombustio nsystems , correlate dt o provid e a coheren t bod y o f emission s data . Th

e dat apresente dar e fo r operatio na t IS O conditions .GENERA L ^ ELECTRI C P. 8

PG7 8 5 1 FUE L LOAD — Output , Hea t Rat e (LHV) , kW Btu/kWh Fue l Consump.(LHV)IO 6 Btu/h r

NO x a s NO2 , *SO x a s SO2 , Particulates , Hydrocarbons , (a s CH 4 ) CO , lbs/h r lbs/h r lbs/h r lbs/h r lbs/h r NATURA L GA S

BAS E 61,30 0 11,00 0 674. 3

32 5 0 <2 4 <1 1 <1 9 PEA

K 67,70 0 10,92 0 739. 3

40 5 0 <2 6 <1 1 <1 9 DISTILLAT E

BAS E 60,00 0 11,13 0 667. 8

51 0 21 6 2 4 1 1 1 9 PEA

K 66,30 0 11,03 0 731. 3

64 0 23 7 2 6 1 1 1 9

•Distillat e Fue l wit h 0.3 % Sulfu rb y Weight / Natura l Ga s Fue l Containin g n o Sulfur . Th e result s ar e base

d on fiel d and combustio n laborator y tes t dat a fro m th e sam e o r simila r machine s an d combustio n systems , correlate d t o provid e a coheren t bod

y o f emission s data . Th e dat a presente d ar e fo r operatio n a t IS O conditions .GENERA L ^ ^ ELECTRI C P. 9

FUE L LOAD — Output , Hea t Rate , (LHV) , Fue l Consum

p (LHV )

NO x a s N02 , *SO x a s SO2 , Particulates , Hydrocarbons , CO , k W Btu/kWh ,10 6 Btu/h r

lbs/h r lbs/h r lbs/h r lbs/h r lbs/h r NATURAL

BAS E 31,75 0 11,28 0 358. 1

18 5 0
< 1 3

< 6 < 1 1 P G 6 4

GA S PEAK 34,75 0 11,21 0 389. 5

22 0 0
< 1 4

< 6 < 1 1 4 1 A

DISTILLAT E BAS E PEA

K 31,10 0 11,38 0 353. 9

32 5 11 5 1 3 6 1 1 34,00 0 11,31 0 384. 5

38 5 12 5 1 4 6 1 1

•Distillat e Fue l wit h 0.3 % Sulfu rb y Weigh t, Natura l Ga s Fue l Containin g n o Sulfur . The result s ar e base d o n fiel d and combustio n laborator y tes t dat a fro m th e sam e o r simila r machine s and combustio n systems , correlate d t o provid e a coheren t bod

y o f emission s data . The dat a presente d ar e fo r operatio n a t IS O conditions .•J . . I

' " • ' • .-••, ' GENERA L ^ ELECTRI C P.1 0

P G5 3 4 1 P FUE L LOA D NATURA L GA S BAS E PEA

K DISTILLAT E

BAS E PEA

K Output , 

### k w Hea t Rat e (LHV) , Btu/kW h Fue l Consump(LHV),10 6 Btu/hr 24,62 0 26,60 0 12,30 0 12,20 0 302. 8 324. 5

NO xa s NO2 , lbs/h r *SO xa s S02 / lbs/h r Particulates , lbs/h r Hydrocarbons , lbs/h r (a s CH 4 ) , CO , lbs/h r 14 0

<. 1 1 < 5 < 1 0 15 5

< 1 1 < 5 < 1 0 24,11 0 26,05 0

12,45 0 12,34 0 300. 2 321. 5

20 0 9 7 1 1 5 1 0 22 5

10 4 1 1 5 1 0

•Distillat e Fue l wit h0.3 % Sulfu rb y Weigh t, Natura l Ga s Fue l Containin g n o Sulfur . Th e result s ar e base do

nfiel dandcombustio nlaborator y tes t dat afro

mth e sam e o r simila r machine s andcombustio nsystems , correlate dt o provid e a coheren t bod y o f emission s data . Th

e dat apresente dar e fo r operatio na t IS O conditions .