Flare Example1

8/19/2019 Flare Example1

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CALCULATION FOR FLARE STACK HEIGHT

THREE METHODS USED

1) FROM API RP 521 ,1990

2) FROM CF BRAUN PUBLISHED IN HYDROCARBON PROCESSING, JAN 19!

") BR#USTO$S%I AND SOMMERS AS MODIFIED IN API 521 ,19&2

CASE : C.2 Example 1: Sizing A Flare Sa!" U#ing T$e Simple Appr%a!$

IN&UT 'ATA Re'( B*Ma+e-a. F./-g I S+a3 4 HC (A&OUR

F./ Ra+e, $ 4 1))*))) .67 A.. "

A8eage M/.e.a $e-g7+ 4 +,.1 A.. "

F./-g Te:;ea+e, T 4 -,) Deg R A.. "

Hea+ O< C/:=+-/, H 4 21*)) BTU6. A.. "

S;e-> Hea+ Ra+-/, 3 4 C;6C8 4 1.1 A.. "

F./-g Pe==e A+ T7e F.ae T-;, P 4 1+.- P=-a A.. "

De=-g Ma7 N:e F/ F.ae 4 ).2 Ma7?N/ A.. "

De=-g $- @e./-+*, U 4 2) :;7 API , BS

Fa+-/ O< Hea+ Ra-a+e, F 4 )./ API , BS

Fa+-/ O< Hea+ I+e=-+* Ta=:-++e, Ta 4 1 API , BS

Ma A../a.e Ra-a+-/, %, a+ D-=+ R 4 2*))) BTU676=< A.. "

D-=+ae, R, T/ Ma A../a.e Ra-a+-/ 4 1) F+ A.. "

L/e E;./=-8e L-:-+, CL, 4 ).)21 M/.e Fa BS

A:-e+ A- Te:;ea+e, Ta 4 2) Deg F BSRe.a+-8e H:--+* 4 ).)0

RESULTS S-:;.e A;;

A&I RAUN S


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/)) !1& 5&5 "

/) 5"1 " 9

+)) 0 ""! "0

+) "1 2& 2&"

)) 25" 21& 229

DISCUSSION OF METHODS

T7e +7ee :e+7/= ae =-:-.a +7/g7 +7ee ae a


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A&I R& 21 *166) 7 A&&EN'I8 C ;age &&

C./.2 CALCULATION OF FLARE 'IA9ETER ;age &9

Ma7 N/ 4 1!02E5)$) T 6 3M$ 05 6 P2) ;age 5&

Reaage e'a+-/ a =/.8e e Ma7 N:e 4 02D-a:e+e S'ae 4 22 =<

F.ae D-a:e+e, , e Ma7 N/ 4 150


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D 4 Ta)F)Q) 6 )"1)%) 05 4 1020 FT

R( 4 R 05)De.+a ) 4 R 4 !!9 FT

H( 4 D)2 R()2) 05 4 1010 FT

H 4 H( 05)De.+a Y) 4 H( Y 4 1095 FT


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DETERMINE Q FOR DIFFERENT RADII FROM FLARE

DISTANCE FROM FLARE D2 Q

FT FT2 BTU6HR SQFT

0 2&5! 205

50 2012 2550

100 20"95 251!

150 25 2000

200 "59"" 12&250 51202 1002

"00 !1!1 !1&

"50 9!0 5"1

00 12!009 0

50 122!& "1

500 2025! 25"


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CF RAUN &ULISHE' IN H'ROCARON &ROCESSING* =AN 16,-

MA @ELOCITY4MACH?NOSQRT"21!%TEMP15)6M$) EQUATION "

1&99"&!50! FT6SEC

@APOUR DENSITY4M$PRESS610!"TEMP) EQUATION 2

@APOUR DENSITY 4 00&"100!505 LB6CUFT

STAC% AREA4FLO$6"00DENSITY@ELOCITY) EQUATION 1

STAC% AREA 4 1!59&0221 SQ FT

STAC% DIAMETER 4 150 FT

DESIGN BASIS

DISTANCE FROM FLARE STAC% 150

MA RADIATION AT D 2000 BTU6HR SQFT

FOR DIAGRAM GO TO CELL AK143

RADIANT HEAT400&HEAT?COMBFLO$SQRTM$)6PID2 HH120DIA))

EQUATION 1 $HERE D IS DISTANCE TO RADIATION

H IS STAC% HEIGHT

REARRANGE AND SOL@E FOR STAC% HEIGHT

EQUATION BECOMES A QUADRATIC

A4 1

B4 1!9!0!29 EQUI@ALENT TO FLAME LENC4 5"!9&192"

QUADRATIC SOLUTION 21 OR 205&1


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50 2&

500 21&


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C./ R>USTO;SKI AN' SO99ERS AS 9O'IFIE' IN A&I 21 *166) ;&&

C./.2 Cal!?lai%n O3 Flare 'iameer ;&9

F.ae D-a:e+e, =a:e a. a= - S-:;.e A;; 150 FT

C././ L%!ai%n O3 Flame Cener ;&9

S/- @e./-+* 4 22"3 DEGR6M$)05S/- @e./-+* 4 99 FPS

A+a. E-+ S+a3 @e./-+* 4 1&99" FPS

L%@er Expl%#ie Limi C%n!enrai%n &arameer* CL

CL a 4 CL)U 6 U/)M 6 M$a) LOG CLBAR

L/g a=e 10

CL a 021!" 02&&92

Cal!?lae &arameer 3%r =e T$r?# ;inB T$r?#* BR

R 4 )U 6 U/)T/M 6 T)05 L/g a=e 10

LOG DJR

R 4 5 1!"590!5

THE THREE PARAMETER LOGLOGLOG GRAPHS FOR FLAME CENTRE AS A HOR#ONTAL DISTA

AND A @ERTICAL DISTANCE YC HA@E BE CORRELATED

F/: F-g C2A, Page 90


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Hea+ L-ea+e, Q 4 $)H) 4 215E09 BTU67

Re.a+-8e H:--+* 4 500

D 4 Ta)F)Q) 6 )"1)%) 05 4 1020 FT

C./. 'ETER9INATION OF FLARE STACK HEIGHT* H

R( 4 R 4 1091! FT

H( 4 D)2 R()2 05 4 11!2 FT

He-g7+ /< S+a3 4 H( Y 4 H 4 && FT

Ta E=+-:a+e, ;9, E' C1) 0&0 50 H:--+*, D


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DETERMINE Q FOR DIFFERENT RADII FROM FLARE

DISTANCE FROM FLARE D2 Q

FT FT2 BTU6HR SQFT

0 151" """0

50 1"&"0 "!11

100 1!2! 29!

150 25 2000

200 "90&1 1"1"250 5!9! &9"

"00 &091 "

"50 109""1 9

00 12!& "0

50 1&115 2&"

500 225&2 229


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RECOMMENDED MACH NUMBERS ARE 02 FOR CONTINUOUS FLARES AND 05 FOR EM

API RECOMMENDS 2 FOR METHANE AND " FOR HEA@IER GASES

Ta e=+ 4 0&0

See Ta.e "

THE MAIMUM RADIANT HEAT IS DIRECTLY BELO$ THE CENTRE OF THE FLAME THE DI

AT THE COORDINATE AS SHO$N IN THE RESULTS SECTION


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150


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F-g A, API521, ;"!

BTU67 F.a:e L Ca.( F.a:e L

1!5! L/g +/ +7e a=e 10 500E0! "0 "00"

00E0& &0 !&0

!00E0& 100 101&

00E10 &00 !9&!1

S*:/. a.+ 015 215E09 1!11

S./;e : C/=+a+ EPC/=+ )

0&

0& LINEST 4 02!299"& &00&5 000&222!1&5

0"0" C/e.a+-/ O< F-g !, Page "9, A;;/-:a+e F.a:e D-=+/+-/

SUM DELTA 6 L 1) "0&9"0209 0 SUM DELTA Y 6L 1)

SUM DELTA 6 L 2) 152"!2211 0 SUM DELTA Y 6L 1)

SUM DELTA 6 L ") 0&512&&& 0 SUM DELTA Y 6L 1)

U∞ 6 U


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009 0!5921"95 009

01 0!!" 01

011 0!9!01&1& 0202 0&&0"2& 0"

0" 0922!!" 0

0 09& 05


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05 095901!5 0

0 091 0!

0! 09" 0&0& 095 09

09 09! 1

1 099 11

11 09!1 12

12 09!" 1"

1" 09!5 1


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TH


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21 O2 !9 N2

M$ a- 4 2&&

CE C


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RGENCY 0! IS THE MAIMUM)

STANCE TO THE MA SHOULD BE SET


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P./+ / F-g A

215E09 1!12

215E09 1!12

1!115!5

F-g A, API521, ;"!U 4 0155

2"252&1" 0 V 0009

00!0"""0"2 0 W0009, V4005 0025 05 05

0"5&15192 0"5&1519 W005, V40 00" 02! 02!

1. 00 E+0 7 1 .0 0E+0 8 1 .0 0E+0 9 1 .0 0E+ 10 1. 00 E+1 1

1

10

100

1000

Heat Rele ase , BTU/hr

F l a m

e

L e n g t h ,

L , f

t .


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02"0955!

01&!&

0"1200&02&9&9&

0205&0&

01!9925

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6

0

0.2

Ratio of Wind / Exit Ve locity


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015000552 F-g !, A;;/-:a+e F.a:e D-=+/+-/, Page "9

0129"15"!1

0112!1201000021"

009100!

00&""

00&1&"

00!!""

00!2&"


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" *"

00 005!9!1

*

2 *2 00 005!9!1 00"59!5"

0012 0! 0! 005 05! 0592"&


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00" 00&95!

00 005!9!1

005 0592"&

00 05"&!1!

00! 0510!212

00& 0&5"1!2


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009 02"095

01 01&!&

02 0"1200&

0" 02&9&9&

0 0205&0&


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S3e+7


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Fig?re C71 'imen#i%nal Re3eren!e# 3%r Sizing a Flare Sa!"

Y

D

H

R(

R

S3e+7


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Page &

Y

F-g A


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Page "

10

100

1000

171.2

Fig. "# $ Flame Length Vers%s Heat Release

Fig 6A

Data Pt.

F l a m e L e n g t h ,

F e e t


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F-g !


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Page 5

0.2

0.4

0.6

0.8

1

1.2

Fig. & $ #''roximate Flame (istortion (%e To Lateral Wind )n *et Velocity From Flare +tac

dY / L

dX / L

Data Pt.

Data Pt.

R a t i o d ! / L

o r d / L

F-g !

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5

Ratio U¥/ U


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Page

Ta.e "

TaDle / 9axim?m 'e#ign Flare RaBiai%n Leel# In!l?Bing S%lar RaBiai%n 42) 7 //) TU$r#35.

Pe:-==-.e De=-g Le8e. %)


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Page !

BTU676=< BTU676=< BTU676=< 3$6:2

N/ / S/.a S/.a T/+a. T/+a. C/-+-/=

1 ,!00 "00 5,000 15!!

2 2,!00 "00 ",000 9

" 1,!00 "00 2,000 "1

1,200 "00 1,500 !"

5 200 "00 500 15&

Hea+ -+e=-+* / =++e== - aea= 7ee/;ea+/= ae /+ .-3e.* +/ e ;e


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Page &

Flare Example1

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