p. 1


# OAR Box 1784 Prepped by Ollie Stewart



### Document

Number: 

# 35 ) II-C- 6 Docket Number: 

# A-84-4 4

Printed 10/31/2008 8:05:39 AM Sheet 35of 143P. 2

Date : Augus t 8 , 198 6

MEMORANDU M 

### TO : Docke t A-84-4 4 FROM : Wm . Larr yElmore , P.E . Industria l Studie s Branc h SUBJECT : SO 2 Emission s Calculation s Th e attache d informatio n wa s develope d b yLarr yElmore , EPA:ISB , t o comput e SO 2 emission s fro m refiner yfue l ga s an d potentia l reduction s b ylowerin g th e NSPS . Thi s procedur e wa s maile d ou t t o variou s trad e organization s and industr yrepresentative s fo r review . Th e mailin g lis t i s attached . Thi s metho d wa s no t use d t o deriv e th e SO 2 emission s presente d i n th e refiner yfue l ga s document .P. 3

PROCEDUR E DESCRIPTIO N Tabl e 1 onpag e 1 list s th e sulfu r emission s fro m mode l sulfu r recover y uni t (SRU ) o f variou s size s whic htrea t variou s concentration s o f hydroge nsulfid e (H2S ) i nth e refiner y fue l ga s (RFG ) t o variou s emissio nlimits . Th e mode l SR Urang e fro

m 5 long tons/da y

(LT/D ) t o 10 0 LT/ Dan

dth e H2 S concentratio nrange s fro m 1 t o 1 0 percen t b

y volume . Th e emissio nlimit s tha t wer e analyze dar e th e curren t new sourc e performanc e standar d(NSPS ) emissio nlimi t o f 23 0 mg/dsc m (0.1 0 gr/dsc f o r 16 2 ppm v ( ? STP) ; on e hal f th e NSP S emissio nlimi t whic hi s equa l t o 11 5 mg/dsc m (0.0 5 gr/dsc f o r 8 1 ppm v @ STP) ; an

don e fourt hth e NSP S emissio nlimi t whic hi s equa l t o 57. 5 mg/dsc m (0.02 5 gr/dsc f o r 40. 5 ppm v @ STP) . Th e Environmenta l Protectio nAgenc y define s ST P a s 20° C and1 atmospher e pressur e (76 0 m

m Hg) . Figur e 1 onpag e 2 illustrate s th e flow diagram o f a namin e treatmen t uni t andSRUuse dt o comput e th e sulfu r emissions . Pleas e not e tha t th e tai l ga s treatmen t uni t wa s omitte dfro m Figur e 1 an

dth e computations . Thi s omissio ncreate s a wors e cas e situatio nwhic hproduce s maximu m sulfu r emissions . Tota l sulfu r emission s pe r day base donthi s flow

scheme ar e th e sulfu r emission s fro m treate dRF Gtha t i s burne di ncombustio ndevice s plu s sulfu r emission s fro m th e SRU . It wa s assume dtha t th e amin e treatmen t uni t andth e SRUoperat e 35 0 day s pe r year . Th e reductio ni nsulfu r emission s a t th e tw o lowe r emissio nlimit s i s compute db y subtractin g th e sulfu r emission s a t th e lowe r emissio nstandar dfro m th e curren t NSP S emissio nlimit .P. 4

2 Tabl e 2 onpag e 3 list s th e percen t efficienc y o f th e amin e treatmen t uni t neede dt o compl y wit hth e variou s emissio nlimit s a t th e variou s H2 S concentrations . Thes e efficienc y number s wer e use dt o comput e sulfu r emission s fro

m th e amin e treatmen t unit . Th e efficienc y o f th e SRU , a thre e pas s Clau s SRU , wa s assume dt o b e 96. 6 percen t (efficienc y range s fro

m 96-9 7 percent) . Sampl e calculation s usin g al l o f thes e assumption s ar e locate don pag e 4 . Th e sampl e calculation s ar e fo r anamin e treatin g uni t tha t i s treatin g RF Gcontainin g 1 percen t H2 S b y volume wit ha 10 0 LT/ DSR Uconvertin g th e concentrate dH2 S int o elementa l sulfur .P. 5 CALCULATIO N SHEE T £<3Ki»e>HJ».Tip N SIGNATUR E PROJEC T DAT E ^ .TIO N 

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50 2 Ecissio nReductio nFro s Variou s Level s o f H2 S i nRefiner y Fue l Ga s (Jul y198b)
SR UMode l Plant s LT/ D 5
1 0
5 0 10 0 H2 S - Percen t b y vol. i 1 : 5 : 1 0 1 5 1 0 1 5 1 0 1 5 1 0 S0 2 Efiissions

a t 16 2 ppav . ftTU LT/ D 0.16 2 0.03 2 0.01 6 0.32 4 0.06 4 0.03 2 1.6 2 0.3 2 0.1 6 3.2 4 0.6 4 0.3 2 SR

U LT/ D 0.33 4 0.33 8 0.33 9 0.66 8 0.67 7 0.67 8 0.03 9 0.03 9 0.03 9 0.07 8 0.07 9 0.07 9 Tot/y

r LT/ Y 173. 7 129. 8 124. 4 347. 5 259. 6 248. 8 580. 7 125. 9 69.9 7 1161 . 251. 9 139. 9 S0 2 Eaission s at 8 1 AT U LT/ D 0.08 1 0.01 6 0.00 8 0.16 2 0.03 2 0.01 6 0.8 1 0.1 6 0.0 8 1.6 2 0.3 2 0.1 6 SR

U LT/ D 0.33 7 0.33 9 0.33 9 0.67 4 0.67 8 0.67 9 0.03 9 0.03 9 0.03 9 0.07 9 0.07 9 0.07 9 Tot/y

r LT/ Y 146. 3 124. 4 121. 7 292. 7 248. 8 243. 4 297. 3 69.9 7 41.9 8 594. 7 139. 9 83.9 7 ppmv . Reductio n LT/ Y 27.386 1 5.409 6 2.704 8 54.772 2 10.819 2 5.409 6 283.386 6 55.977 6 27.988 8 566.773 2 111.955 2 55.977 6 SD 2 Emission s a t 40. 5 ppuv . AT U LT/ D 0.04 1 0.00 8 0.00 4 0.08 2 0.01 6 0.00 8 0.4 1 0.0 B 0.0 4 0.8 2 0.1 6 0.0 8 SR

U LT/ D 0.33 8 0.33 9 0.33 9 0.67 7 0.67 9 0.67 9 0.03 9 0.03 9 0.03 9 0.07 9 0.07 9 0.07 9 Tot/yr LT/ Y 132. 8 121. 7 120. 3 265. 7 243. 4 240. 7 157. 4 41.9 8 27.9 9 314. 8 83.9 7 55.9 8 Reductio n

LT/ Y 40.910 1 8.114 4 4.057 2 81.820 2 16.228 8 8.114 4 423.330 6 83.966 4 41.983 2 846.661 2 167.932 8 S3.966 4 ATU=Aain e Treataen t Uni t Operatin g Days=35 0 davs/vea r SRU=SuHu rRecover

yUni t 1 Ton ofSulfur= 2 Ton s ofSQ 2 TBTU=Tai l Ga

s Treatmen t Uni t SR U <2 0 LT/ D ar e no t require d t o hav e T6TU . SR U efficienc yw/

o T6TU=96.6X SR U efficienc y* /

T6TU=99.9X AT U S02 Et3issions=((SR U Pit . size)-((SR U Pit . size ) (AT U Eff.)))t 2 SR U S0 2 Esissions=((SR U Pit . size)(AT U Eff.)-(SR U Pit . size)(AT U Eff.)(SR U Eff.))l 2 Tota l S0 2 Eaissions=(IAT U S0

2 Eaissions)+(SR U S0

2 Efiissions ) 1*35 0

Aein e Treate r Efficienc y a t Variou s K2 S Level s RF GH2 S !A

T XEfflA T I EfflA T XEf f Cone . la

t NSP S la t NSP S Ea t NSP S ppav . 116 2 ppav l 8 1 ppav140. 5 ppav 1000 0 1 0.983 8 . 0.991 9 ! 0.995 9 5000 0 ! 0.996 8 ! 0.998 4 ! 0.999 2 10000 0 ! 0.998 4 1 0.999 2 1 0.999 6