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# OAR Box 1778

Prepped by Ollie Stewart



### Document

Number: 

# 236)11-1-1 6

Docket Number: 

# A-90-0 6

Printed 10/28/20089:51:02 AM Sheet 236 of 276

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## Wisconsin Electric

POWS A COMPANY

23lWMteniQcaPO.0a2Ci«.Mliv^l<Ot5.Wi£32fl 1 ('.vi } 221-234 5 Augus t 15 , 199 0

Mr . Pau l 0 . Yeun g f~T ~ Environmenta l Enginee r i , : Wisconsi nDepartmen t o f Natura l Resource s Burea uo f Ai r Managemen t P . 0 . BOX792 1 . . . Madison , Wisconsi n53707-792 1 * L



# I ;l]i l JU N 

### I 2 199 1 

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Dea r Mr . Yeung : 

### ) EP AAI R D C '•i ^ j \ fr.3

PROPOSE D AI RPOLLUTIO N CONTRO L PERMI T FO R POR T WASHINGTO

N POWE RPLANT (PERMI T NO . 90-POV-037 ) Thi s i s a follow-u pt o on e o f th e item s w e discusse da t ou r meetin g o f Augus t 6, 1990 . A s w e understan dit , th e DNR' s propose dpermi t condition s fo r S0 3 contro l o nUnit s 1 and4 ar e bein g impose dt o avoi dtriggerin g NSP S fo r S0 2 onthes e boilers . Th e propose dpermi t condition s woul drequir e th e compan y t o operat e th e S0 2 remova l equipmen t (dr

y sorben t injection ) o nunit s l an d4 a t al l times , eve n whe nth e unit s wer e operate da t lo w loads . I t ha s bee nth e DNR' s position , base do nit s understandin g o f EPA' s position , tha t us e o f technology

t o reduc e S0 2 emission s fro m th e unit s afte r renovation , t o o r below

thos e a t curren t maximu m capability , mus t b e applie do na continuou s basis . T o ge t a mor e definitiv e explanatio no f th e EPA position , w e spok e t o Mr . Joh nCalcagni , Directo r o f th e Ai r Qualit y Managemen t Divisio no f EPA' s Offic e o f Ai r Qualit y Plannin g an

dStandards , andwe mad e Mr . Zieg e awar e o f thi s contact . Mr . Calcagn i wil l provid e EPA' s officia l positio nt o yo ushortl y throug hth e Regio nV office . However , Mr . Calcagn i expresse dhi s persona l belie f tha t th e propose d S0 2 remova l equipmen t nee dno t b e operate da t al l time s i norde r t o b e considere da technologica l syste m fo r continuou s S0 2 removal , i f ther e exis t vali dreason s wh y th e equipmen t canno t b e operate da t al l times . TECHNICAL CONCERN S WIT H DR YSORBEN T INJECTION S (PSI ) US E AT LO W LOAD S

A s w e discusse dwit hyo uo nAugus t 6 , ther e ar e vali dtechnica l reason s why

w e shoul db e exemp t fro m usin g th e DS I equipmen t durin g Unit s 1 an

d4 start-up , shutdown , an dboile r tri po r los s o f burne r flame . Th e reason s th e technology shoul dno t b e applie ddurin g thos e boile r operatin g condition s ar e describe dbelow . Inlectio no f sodiu

m bicarbonat e prio r t o obtainin g 325° F precipitato rP. 3



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| Tal l 

# m Mr . Pau l 0 . Yeun g Augus t 15 , 199 0 Pag e 2 precipitato r operation s an dcollectio nefficiency * Durin g th e start upo f a unit , th e precipitato r interna l meta l surfac e temperature s typicall y

la g flu e ga s temperature s b y 2 0 t o 30*F . Operatin g dat a an dprecipitato r inle t flu e ga s temperature s collecte ddurin g a recen t start-u po f Uni t 3 ar e provide donTabl e 1 . Durin g tha t start-up , a naverag e precipitato r inle t temperatur e o f 325* F wa s firs t aohleve da t a napproximat e uni t electrica l loa do f 22-2 6 MWe , a t correspondin g feedwate r flow s o f 203-22 6 Klb/hr . A t thi s poin t i n uni t start-up , precipitato r surfac e temperature s ar e estimate da t 300°F . sorben t utilizatio ni s a measur e o f how muc hsodiu

m bicarbonat e complete s th e reactio nwit hsulfu r dioxid e i nth e flu e ga s t o for m sodiu m sulfate . A t 100 % utilization , approximatel y 2. 7 pound s o f sorben t wil l remov e on e poundo f SO, , ou r tes t result s andothe r publishe dtes t result s hav e show ntha t flu e ga s temperature s below 300° F significantl y

reduc e sorben t utilizatio nbecaus e therma l decompositio no f th e sodiu m bicarbonat e i s to o slow an dincomplete . I nth e 25 0 - 290° P range , sorben t utilizatio ndecrease s t o th e 6S
70 1 range ; an

dbelow 250°F , utilizatio no r reactio ni s reduce dt o les s tha n30* . Th e resul t o f injectin g sodiu m bicarbonat e below

325° F t o maintai na fixe dpercentag e S0 2 remova l woul db e t o increas e th e sorben t requiremen t du e t o poo r utilizatio ncausin g a substantia l increas e i n th e precipitato r inle t mas s loadin g an dsodiu m bicarbonate/sodiu

m sulfat e rati o i nth e fl y ash . Th e sodiu

m bicarbonate/sodiu

m sulfat e compound s ar e highl y conductiv e material s whic har e easil y collecte d i na precipitator . However , becaus e the y ar e s o conduotiv e the y ar e easil y re-entraine dint o th e ga s strea m causin g a nincreas e i noutle t opacity . Th e presenc e o f th e highl y conductiv e materia l i nth e precipitato r wil l als o caus e excessiv e precipitato r sparkin g a s th e coa l flo

w i s increase dt o rais e uni t load . Additionally , w e expec t tha t th e presenc e o f th e highl y conductiv e materia l wil l caus e ES P curren t level s t o achiev e controlle dmaximu m level s a t lowe r tha n desire dvoltages . Thi s phenomen a wil l caus e lowe r coron a aroundth e wires , causin g overal l lowe r fiel ddensities , andhence , lowe r ES P collectio nefficiencie s fo r fl y ash . Th e overal l ne t effec t o f injectin g th e sodiu m bicarbonat e int o lo w temperatur e flu e ga s an dES P surface s wil l b e t o increas e opacit y durin g uni t start-up , an dcaus e long-ter

m precipitato r performanc e problems . PROPOSE D PERMI T CONDITIO N LANGUAG E
Base do nth e abov e discussion , w e hav e propose dwordin g o f th e permi t condition s a s the y

relat e t o th e S0 2 emissio nlimitation s fo r Unit s l an d4 . Th e propose dpermi t languag e w e offe r fo r you r consideratio n is :P. 4 

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. 134 .

Mr . Pau l 0 . Yeun g Augus t 15 , 199 0 pag e 3
"Th e permitte e shal l install , maintai nandoperat e continuou s sulfu r dioxid e emissio ncontro l equipmen t (dr y sorben t

. injection ) o nUnit s 1 and4 . Complianc e wit hth e S0 2 emissio nlimitation s andpercen t reductio nrequirement s unde r Sectio nI appl y a t al l time s excep t durin g period s o f uni t start-u pandshutdown , anddurin g a boile r tri po r los s o f flame . Durin g a uni t start-up , th e sulfu r dioxid e emissio ncontro l equipmen t shal l b e operate dwheneve r th e averag e precipitato r inle t ga s temperatur e i s greate r tha n325° F andth e uni t i s on lin e (mai ngenerato r breake r closed) . Th e reguire dpercen t remova l (22 % Uni t i j 13 % Uni t 4 ) shal l b e obtaine dprio r t o th e uni t obtainin g 3 0 MW e ne t output . Durin g uni t shutdown , th e sulfu r dioxid e emissio ncontro l equipmen t shal l b e operate dunti l jus t prio r t o th e remova l o f coa l fir e fro

m th e boiler . Durin g a boile r tri po r los s o f flame , th e sulfu r dioxid e emissio ncontro l equipmen t wil l b e take nout-of-servic e immediatel y

unti l th e furnac e purg e cycl e i s completed , uni t i s bac k on-line , andboile r condition s hav e stabilized. "

W e woul dappreciat e you r consideratio no f th e informatio nprovide da s yo uprepar e th e fina l draf t o f th e ai r permit . Th e othe r concerns we discusse dwhic hwe hop e yo uwil l addres s i nth e fina l permi t ar e furthe r allowance s fo r trac e meta l variabilit y i nth e coa l anda slightl y

highe r NO xemissio nlimitatio nfo r eac hboile r followin g renovation . W e woul dals o appreciat e a copy o f th e fina l draf t permi t whe ni t i s circulate dfo r interna l departmen t review . W e ar e anticipatin g tha t yo uwil l b e abl e t o issu e ou r ai r qualit y permi t fo r thi s projec t whe nth e publi c commen t perio do nth e DNR' s environmenta l assessmen t closes , whic hi s expecte dt o b e abou t Augus t 31 , 1990 . Sincerely ,

Rogia J D . Dodd s Ai r qualit y

Enginee r Environmenta l Departmen t



### rrn m
co s Wol f Klasse n- DNR/SE DP. 5



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bcc : J . W . Bosto n Fran k Bouche r N . B . Childres s W . A . Ebe l E . R , Fin e R . R . Grig g H RPlat z M . P . Steinberg/R . F . Pierce/B * A . Petermann P . D . Schumache r W . T . Woelfl e E D Fil e 2.1 1P. 6

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### TABL E I Por tWashingto n Uni t3 Start-u p Operatin g Dat a

Tima , CO.01:1 5 00:11:1 5 00:21:1 5 00:31:1 5 00:41:1 5 00:51:1 5 01:01:1 5 01:11:1 8 01:21:1 9 01:31:2 0 01:41:2 0 01:51:0 0 02:01:2 0 02:11:2 1 02:21:2 5 02:31:4 0 02:42:0 4 02:52:3 2 03:02:6 8 03:13:1 5 03)23:4 7 03:34:1 9 03:45:0 4 03:55:3 1 04:05 : A S 04i15:0 3 04)26:1 1 04:36:2 8 Uni t Lot *

MU « 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 0. 0 .05 2 2.7 1 6.0 0 6.6 3 6.7 3 7.0 5 6.9 9 11. 5 12. 3 13. 5 14. 1 20. 1 21. 2 21. 9 25. 8 26. 9 29. 3 feedwate rPlo w Klb/h r 58. 4 54. 0 81. 2 66. 4 62. 8 69. 6 66. 8 12 2 65. 2

•• , 99. 6 72. 0 74. 4 74. 4 99, 2 75. 6 12 7 119 11 4 14 4 14 3 16 0 17 4 18 7 21 2 20 3 20 6 26 0 26 3 Ai r Heater outle t ea t Temp . ( f) No . 3 1 Wli M
26 1 26 4 26 8 27 1 27 3 27 5 27 7 27 8 27 7 27 7 28 0 28 3 28 3 29 0 29 2 29 1 29 2 29 2 29 4 29 6 29 9 30 4 30 7 31 0 31 4 31 8 32 2 32 9 27 7

28 1 28 4 28 8 28 9 29 1 29 4 29 6 29 7 29 7 29 8 30 1 30 4 30 8 30 9 30 8 30 7 30 8 30 9 31 1 31 4 31 9 32 3 32 8 33 2 33 6 34 0 34 7 ftyeraae

26 9 27 3 27 6 27 7 28 1 28 3 28 5 28 7 28 7 28 7 28 9 29 2 29 5 29 9 30 0 30 0 30 0 30 0 30 2 30 4 30 7 31 2 31 3 31 9 32 3 32 7 33 1 33 8