Report on Acid Cleaning

8/13/2019 Report on Acid Cleaning

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POST OPERATIONAL CHEMICAL CLEANING OF BOILER #3

SSTPS, SINGRAULI.

Post operational chemical cleaning of boiler U#3 started on 16th of April, 2008.

This as act!all" sched!led to be started on th of April. The dela" as d!e to

fail!re of acid inhibitor $hodine A 213%&en'el %(!mbai !nder laborator"

conditions. )hich lead to fresh p!rchase of *oronil 213 special from Ar!dra

+ngineering P-t. /td., *hennai. e acid inhibitor as recei-ed on the site on

1th of April.

efore the decision of acid cleaning for boiler U#3 as ta'en, deposit anal"sis

as carried o!t in detail at TP* $ 4 *enter. 5indings of $4 and methodof acid cleaning for boiler U#3 as gi-en as follos7

Introduction:

nternal deposit 9!antit" of ater all t!bes of boiler #3 as carried o!t in $

4 lab. t shos that the presence of !"$ %&'c&( on the hot s!rfaces and 3)"$)

&%'c&( on the cold side of s!rfaces. Platen ater all t!bes contain the internal

deposit 9!antit" !! &%'c&( at loer side and $* %&'c&( at !pper side of thet!be nternal deposit anal"sis consist of Co++r $.".3-, C/ciu& (.!").)-

and Si/ic 0.)"0.1- along ith ron o:ide. ;n the basis of internal 9!antit" and

anal"sis, single stage post operational chemical cleaning is recommended. The

e:periments ere cond!cted in laborator" to finali<e the chemical cleaning

process. The proced!re for chemical cleaning incl!des the folloing steps.

!. A/2/i Boi/out

(. Acid Pic2/in%

3. Nutr/ition

$. P44i5tion



!. A/2/i Boi/out:

To dislodge = loosening of hard, adherent deposit on the internal s!rfaces of t!be,

al'ali boilo!t is recommended ith !se of Trisodi!m phosphate 1000 ppm and

4isodi!m phosphate 00 ppm at minim!m > of operating press!re of boiler.

efore the al'ali boilo!t, the boiler dr!m is cleaned mechanicall". All the boiler

instr!ments leads and sampling lines sho!ld be isolated e:cept the dr!m

sampling line and direct reading le-el of ga!ge glass.

oiler is filled ith 4( ater and s!bse9!entl" drained to remo-e an"

s!spended matter present in the boiler. oiler is again filled ith 4( ater !p to

the bottom le-el of the dr!m. The re9!ired chemicals are charged in the form of

concentrated sol!tion thro!gh dr!m manhole.

oiler is lighted !p as per the ;( instr!ctions and press!re is raised grad!all"

!p to > of operating press!re. 4!ring entire process, normal dr!m le-el is to be

maintained to a-oid an" possibilit" of carr"o-er in the s!pper heater. ;nce the

press!re is attained, held for to ho!rs and blo don is gi-en b" operating the

lo point drains in se9!ence each for 30 seconds, after the fire is p!t o!t. After

completion of bloing operation, the abo-e process of raising press!re, holding press!re and blo dons are repeated for si: times.

4!ring the process , the samples are anal"<ed for p& and al'alinit"

meas!rement. The boiler is alloed to cool don grad!all". )hen the dr!m

press!re drops to 2 ?g=cm2, the entire s"stem is drained hot. ;n completion of

total draining, the boiler is ashed ith 4( ater till the drain sample is free

from phosphate.

After completion of al'ali boilo!t process, the boiler is to be prepared for acid

cleaning hich incl!des the ater alls, economi<er, dr!m, don comers andlo point drains. The erection of temporar" piping, -al-es, fittings, circ!lation

tan's and p!mp sho!ld be completed. The dr!m internal sho!ld be remo-ed and

orifice plate sho!ld be installed for all don comers. Pl!gging the connecting

t!bes in main dr!m sho!ld isolate the s!per heaters.



(. Su+r Htr Fi//in%:

ac' fl!sh the s!per heater ith 4( ater and bac'fill ith treated ater

containing 200 ppm h"dra<ine and ammonia to raise the p& @ 10. Pl!g the s!per

heater connecting t!bes inside the dr!m. $aise the press!re to 7 ?g=cm2 andisolate s!per heater.

B!spend the ater all t!be sample co!pons inside the dr!m at both the end to

ascertain efficienc" of cleaning and passi-ation before c!tting of act!al t!be

from boiler.

3. Co/d 6tr Rin4:

5ill the s"stem ith 4( ater and establish circ!lation b" p!mps. *irc!late forabo!t C an ho!r and drain.

$. Hot 7tr drin:

5ill the s"stem ith 4( ater and establish circ!lation b" p!mps. $aise the

temperat!re of ater to 7600 * b" passing the steam in circ!lating tan' and

drain after circ!lation of half an ho!r.

. Acid Pic2/in%:

The folloing chemicals are re9!ired for acid pic'ling stage

1. Acid inhibitor 0.20 D -=-

2. Ammoni!m bifl!oride 0.2 D =-

3. Thio!rea 1.0 D =-

. &"drochloric acid .0 D =-

5ill the boiler s"stem ith 4( ater and establish circ!lation ith circ!lation

p!mps. Admit steam into mi:ing tan' and raise the temperat!re of circ!lating

ater to abo!t 6700 * in ret!rn line. *!t off steam and add a small 9!antit" of



&*l and immediatel" folloed b" re9!ired 9!antit" of acid inhibitor. ?eep the

p!mps r!nning for thoro!gh mi:ing. *harge calc!lated 9!antit" of ammoni!m

bifl!oride in the mi:ing tan' slol" and circ!late the s"stem for complete

mi:ing of chemicals. Add re9!ired 9!antit" of &*l in controlled manner so that

acid concentration does not increase more than 6D. Acid concentration is to bemeas!red at n inter-al of 10 min!tes hile the acid is being added. Anal"<e the

sample from inlet and ret!rn line for acid concentration, iron and copper. The

circ!lation ill be terminated once the stead" -al!es of iron, copper and acid are

obtained in both inlet and ret!rn line or ma:im!m si: ho!rs after addition of

chemicals. 4rain the s"stem !nder 2 capping.

. 8M 6tr Rin4:

5ill the boiler s"stem ith 4( ater and establish circ!lation ith circ!lation

p!mps. $aise the temperat!re of circ!lating ater !p to 07600 * b" inEecting

steam and circ!late for 30 min!tes. 4rain the s"stem !nder 2 capping.

). Citric Acid Rin4:

5ill the boiler s"stem ith 4( ater and establish circ!lation. $aise the

temperat!re of circ!lating ater !p to 070

* and add 0.2D =- citric acid.Add li9!or ammonia to raise the p& of circ!lating ater to 3.7 .0. *irc!late for

2 ho!rs. (eas!re the p& and iron content in the sol!tion at an inter-al of C an

ho!r. 4rain the s"stem !nder 2 capping.

*. I4t 8M 6tr Rin4:


temperat!re of circ!lating ater !p to 070

* and circ!late C an ho!r. (eas!rethe iron content in the inlet and ret!rn line. 4rain the s"stem !nder 2 capping.

1. IInd 8M 6tr Rin4:




temperat!re of circ!lating ater !p to 070 * and circ!late C an ho!r. 4rain

the s"stem !nder 2 capping. After meas!ring the iron content in the inlet and

ret!rn line.

!!. P44i5tion 4t% 9 I:

5ill the boiler s"stem ith 4( ater and establish circ!lation. Add h"dra<ine to

get the concentration of h"dra<ine from 007 00 ppm and add ammonia sol!tion

to raise the p& !p to 10.0. $aise the temperat!re of circ!lating ater !p to 807

F00 * b" addition of steam circ!late for 20 ho!rs. (eas!re the h"dra<ine

concentration and p& of circ!lating ater periodicall". Add h"dra<ine into

sol!tion hen concentration goes belo 200 ppm. 4rain the s"stem in hotcondition. ;pen -ent, dr!m manholes and c!t bottom ring headers st!bs to cool

don the s"stem in aerated condition.

!(. P44i5tion 4t% 9 II:

$estore the boiler after chemical cleaning b" p!tting dr!m internal and all the

permanent connection. Prepare the boiler for reg!lar operation as per the

g!idelines of ;(. 5ill the boiler ith 4( ater containing 200 ppm ofh"dra<ine and ammonia to raise p& 10.0. /ight !p the boiler and raise the

press!re to 0 ?g=cm2 and maintain the press!re for 2 ho!rs. 4!ring the

process, inEect h"dra<ine in the feed ater to maintain h"dra<ine concentration

2 ppm. After completion of stage passi-ation, the boiler can be ta'en for

reg!lar operation.

!3. E/unt Trt&nt:

The effl!ent generated after each stage of acid pic'ling ill be treated ith

ca!stic soda fla'es or ca!stic l"e to a p& le-el from .7 8.0 before discharging

from plant. The effl!ent after first stage passi-ation ill be treated ith

bleaching poder.



!$. E/unt nutr/ition +it:

A ne!trali<ation pit sho!ld be made a-ailable near the site ith the holding

capacit" of aro!nd 00 (3. The pit sho!ld ha-e non7corrosi-e lining, circ!lating

and discharging p!mps capacit".

!. In4+ction o ;oi/r tr c<&ic/ c/nin%:

4r!m manhole sho!ld be opened and -is!all" inspected the dr!m internal

s!rface and ater all co!pons placed in the dr!m for smooth !niform formation

of magnetite coating and effecti-eness of cleaning. Arrangement sho!ld be made

to c!t the ater all t!be samples from high heat affected area after chemical

cleaning to calc!late 9!antit" of deposit on the internal s!rface, if an".

Actu/ co&&nc&nt nd o//o7 u+:

C<c2 /i4t:"

A chec' list as prepared ith certain chec' points so as to ens!re and assign

-ario!s responsibilities to concerned departments.

S.No. C<c2 +oint4 R4+on4i;i/it=

01 /ighting +(4

02 Arrangement for testing table *hem

03 Bhifting of testing apparat!s *hem

0 Btoc'ing of chemicals *hem

0 Arrangement of PP+s (4=*hem

06 2 *"linder Proc!rement and stoc'ing at site (4

0 Arrangement of shoers (4

08 )ashing hose (4

0F Presence of 4octors B ? $o"=G ? a"a' 10 Amb!lance (4

11 Air hose (4

12 Acid !nloading hose (4

13 Acid tan'er arrangement *hem

1 *irc!lation tan' and piping lea'age testing (4

1 $eadiness of Pit *hem



16 (a'ing both ?B read" +(4=;(4

1 ;ne telephone near circ!lation tan' (4=T

8ti/4 o +rocdur or c<&ic/ n/=4i4 :

8ETERMINATION OF HCL CONCENTRATION IN PIC>LING

SOLUTION :"

REAGENTS "

A.Sodium hydroxide solution , Standard 1.0 N

B.Mixed Indicator

Three parts of Bromo cresol green 0.1 ! solution in

alchohol"

#ne part of Methyl $ed 0.%! solution in alchohol"

PROCE8URE"

a.10 ml of sample

&.%'( drops of methyl red indicator

c. Titrate )ith 1.0 N Na#* solution.

d.+nd point from grey to &lue' green.

CALCULATION 9

- HC/ ? @ 0.3

6<r @ ? Mi//i/itr4 o !.0 N NOH u4d to o;tin nd +oint.



ESTIMATION OF H8RAINE:" DMt<od no. !

REAGENTS"

A. Stndrd 0.! N Pot44iu& Bro&t

D8i44o/5 (.)*3 % o >BrO3 nd !0 % o >Br in 8M 7tr nd

&2 u+ to ! Litr

B. 0.!- Mt<=/ Rd indictor 4o/ution.

C. Conc. HC/ S+. Gr. !.!*

PROCE8URE"

. !0 &/ o 4&+/.

;. Add !0 &/ conc. HC/

c. " dro+4 o &t<=/ rd indictor 4o/ution.

d. Titrt 7it< 4tndrd 0.!N >BrO3 4o/ution.

. End +oint =//o7 co/our.

CALCULATION"

H=drin 4 N(H$ D++& ? Titr 5/u *0



H8RAINE ESTIMATION:" DMt<od no. (

REAGENTS"

. 0.!N N(S(O3 D ($.*(( % o N(S(O3 .H(O in !.0 Litr

;. 0.! N Iodin 4o/ution D!(.1( % o I( (0 % o >I in !.0 Litr

c. !.0- 4o/ution o Strc< D!.0 % o 4trc< in !00 &/

d. (.0 N NOH D*0.0( % o NOH in !.0 Litr

. (.0 N H(SO$ D1* % in !.0 Litr

PROCE8URE"

. !0 &/ 4&+/ !00 &/ 8M 7tr

;. (.0 &/ (.0 N NOH 0.! N Iodin

c. Sto++r t< /42 Stt/ or 3 &inut4.

d. Add (. &/ o H(SO$ 4trc< indictor

. Titrt 7it< 0.! N T<io DRcord nd +oint 4

. Crr= out ;/n2 +ri&nt t2in% !00 &/ 8M 7tr on/=.

DRcord nd +oint 4

CALCULATION"



H=drin 4 N(H$ D++& ? D" *0

H8RAINE ESTIMATION:" DMt<od no. 3

REAGENTS"

. Sodiu& ;icr;ont

;. 0.! N Iodin So/ution

c. Strc< Indictor

PROCE8URE"

. !0 &/ 4&+/ ( &/ 8M 7tr

;. Add +inc< o NHCO3 4trc< Indictor

c. Titrt %in4t 0.! N Iodin So/ution.

d. End +oint %i54 ;/u co/ourtion.

H=drin 4 N(H$ D++& ? Titr @/u *0



CITRIC ACI8 ESTIMATION:"

REAGENTS"

. 0.! N Stndrd NOH 4o/ution.

;. Mid indictor 4o/ution

c. P<no/+<t</in 4o/ution

PROCE8URE"

. 0 &/ 4&+/

;. $" dro+4 o &id indictor

c. Titrt 7it< 0.! NOH

d. End +oint co/our c<n%4 ro& rd t<rou%< %r= to ;/u %rn

DRcord t< 5o/u& A

. T2 not<r 4&+/

. Add $ dro+4 o +<no/+<t</in indictor.

%. Titrt %in 7it< 0.! N NOH

<. End +oint co/our c<n%4 to +in2 co/ourDRcord t< 5o/u& B



CALCULATION"

- Citric Acid ? DB"A 0.0!(*

ESTIMATION OF AL>ALINIT:"

REAGENTS"

!. 0.! M HC/ cid DStndrd: 8i44o/5 3.$) % Dor 1 &/o HC/ in ! /itr

nd 4tndrdi 7it< 4tndrd N(CO3 So/ution.

(. Mid Indictor :

. Pr+r 0.!- Bro&ocr4o/ %rn in /c<o<o/

;. Pr+r 0.(- Mt<=/ Rd in /c<o<o/

Mi ) c.c. o or&r 7it< ( c.c. o /tr.

PROCE8URE"

A. !0.0 &/ 4&+/

B. ("3 dro+4 &id indictor

C. Titrt %in4t 0.!N HC/

8. End +oint co/our i4 4/i%<t rd.

CALCULATION"

A/2/init= ? Titr 5/u 0.$ %' L



ESTIMATION OF TOTAL IRON IN PIC>LING SOLUTION:"

REAGENTS"

A. Sodiu& Actt

B. C</oroctic Acid

C. Su/+<o4/ic=/ic Acid

8. Pot44iu& +r 4u/+<t D> (S(O*

E. 0.0!M Stndrd E8TA 4o/ution

PROCE8URE"

. !0.0 &/ 4&+/

;. ! % Sodiu& ctt ! % C</oroctic cid Su/+<o4/ic=/ic Acid

c. Titrt %in4t 0.0! M E8TA

d. End +oint +in2 to +/ =//o7. DRcord 5o/u& 4 A

. To t< 4& 4o/ution dd ! % +ot44iu& +r 4u/+<t

. Titrt %in4t 0.0! M E8TA /rd= in t< ;urtt.

%. End +oint i4 +in2 to =//o7. DRcord t< 5o/u& 4 B



CALCULATION"

Frric Iron D++& ? A 0.0! 000'!0 ? A

Tot/ Iron D++& ? B 0.0! 000'!0 ? B Frrou4 Iron ? Tot/ Iron 9 Frric Iron

IRON J COPPER ESTIMATION IN HC/ SOL@ENT SSTEM USE8

FOR ACI8 CLEANING:"

REAGENTS"

!. A&&oniu& ;i/uorid cr=4t/4

(. H=drin 4u/+<t 4o/ution D!.0 -

3. Pot44iu& Iodid

$. >MnO$ So/ution D.0 -

. 0.! N Stndrd 4odiu& t<io4u/+<t 4o/ution

. Strc< Indictor

PROCE8URE FOR IRON"

. !0 &/ i/trd 4&+/ ( &/ 8M 7tr

;. >MnO$ So/ution dro+ 7i4 ti// +r&nnt +in2 co/our ++r4

c. H=drin 4o/ution dro+ 7i4 ti// +in2 co/our di4++r4.

d. Add ( dro+4 in c44.

. % >I nd 4to++r t< /42. A//o7 to 4tnd or &inut4.

. Co/our c<n%4 ro& =//o7 to ;ro7n.

%. Add 4trc< indictor. Co/our c<n%4 to ;/u.



<. Titrt 7it< 0.! N Sodiu& t<io4u/+<t ti// ;/u co/our di4++r4.

DRcord t< 5o/u& 4 A

PROCE8URE FOR COPPER"

. !0 &/ i/trd 4&+/ ( &/ 8M 7tr

;. >MnO$ So/ution dro+ 7i4 ti// +r&nnt +in2 co/our ++r4

c. H=drin 4o/ution dro+ 7i4 ti// +in2 co/our di4++r4.

d. Add ( dro+4 in c44.

. Add &&oniu& ;i/uorid % nd &i 7//.

. % >I nd 4to++r t< /42. A//o7 to 4tnd or &inut4.

%. Co/our c<n%4 ro& =//o7 to ;ro7n.

<. Add 4trc< indictor. Co/our c<n%4 to ;/u.

i. Titrt 7it< 0.! N Sodiu& t<io4u/+<t ti// ;/u co/our di4++r4.

DRcord t< 5o/u& 4 B

CALCULATION FOR IRON J COPPER"

Iron D++& ? DA"B *.

Co++r D++& ? B 30

A ? &/ o t<io4u/+<t con4u&d durin% iron 4ti&tion

B ? &/ o t<io4u/+<t con4u&d durin% co++r 4ti&tion



TEST PROCE8URE FOR COPPER ESTIMATION IN AMMONICAL

BROMATE SOL@ENT SOLUTION 8URING BOILER CLEANING

REAGENTS"

!. Sturtd 4odiu& 4u/+<it 4o/ution DA++ro. (00%'Litr

(. H=droc</oric cid D!:!

3. Pot44iu& +r&n%nt 4o/ution D(0 %'Litr

$. H=drin 4u/+<t 4o/ution D4turtd

. A&&oniu& ;i/uorid %rnu/r

. >I Cr=4t/4

). 0.! N 4tndrd 4odiu& t<io4u/+<t 4o/ution

*. Strc< indictor

PROCE8URE"

. (&/ 8M 7tr !0 &/ 4&+/

;. $ &/ o 4turtd N(SO3 4o/ution 9 //o7 to rct or ("3 &in.

c. &/ HC/ D!:! dro+ 7i4 unti/ t< co/our di4++r4. Add /itt/ c44.

d. Add >MnO$ 4o/ution dro+ 7i4 unti/ +r&nnt +in2 co/our i4

o;tind.



. Add H=drin 4u/+<t 4o/ution D4turtd unti/ t< 4o/ution i4 c/r

nd t<n dd !"( dro+4 in c44.

. Add ("3 % o &&oniu& ;i/uorid, 4<2 7// //o7 to 4tnd or (

&in.

%. Add !"( % o >I to t< /42 nd 4to++r, &i nd //o7 to 4tnd or 3"

&in.

<. Titrt t< 4o/ution 7it< t< 0.!N N(S(O3 ti// t< ;ro7n co/our 4trt4

to di4++r.

i. Add 4trc< indictor nd continu titrtion ti// t< ;/u ;/c2 co/our

di4++r4.DRcord t< 5o/u& A

CALCULATION"

Co++r D++& ? A !000 0.! 3' @o/. o 4&+/

Co++r D- ? A 0.! .3' @o/. o 4&+/ 4+.

%r. o 4&+/

ANALSIS OF FERRIC IRON:"

REAGENTS"

!. !.0N N(CO3 4o/ution

(. Su/+<o4/ic=/ic cid 4o/ution D-



3. 0.0! M E8TA 4o/ution

PROCE8URE"

. ( &/ o 4&+/ nd dKu4t +H to (. 7it< !.0 N N(CO3 4o/ution

;. 8i/ut to !00 &/ nd dd dro+4 o 4u/+<o4/ic=/ic cid 4o/ution

c. Titrt 7it< 0.0! M E8TA unti/ +in2 Ku4t ++r4

d. Add urt<r i5 dro+4 o indictor nd continu t< titrtion unti/ t<

+in2 co/our di4++r4.

CALCULATION"

Frric Iron D++& ? Titr 5/u ((.3



E5nt dti/4:

As per $4 recommendation al'ali boil o!t as not done.

8= !: !$'0$'(00*

Su+r Htr Fi//in% :C<&ic/

+r+.' Fi//in%

Ti& Addition o C<&ic/4 +H H=drin Conc. D++&

H=drin

DIn Litr4

A&&oni

DIn Litr4

!4t ;tc<

Fi//in% 4trtd

!:$0 " "

!:$ " " !0.( (!

!: " "

!):00 " " !0.( $!

(nd ;tc<

Fi//in% 4trtd

!):3 ! ! !0.( 3!$!):0 3 ! !0.0 (3(

!*:0 " " " 33

!*:!0 ! " "

!*:(0 " " !0.0 $3(

3rd ;tc<

Fi//in% 4trtd

!1:00 !0 !0 " "

!1:0 " " !0.3 $$*

!1:!0 " " " "

$t< ;tc<

Fi//in% 4trtd

!1:$0 !0 !0 " "

(0:00 " " !0.( $$

(0:0 " " " "

t< ;tc<

Fi//in% 4trtd

(0:$0 !0 !0 " "

(0:0 " " !0.( $1

(!:!0 " " " "





I'L O'L O'L!:0 $0 " "

!):30 $ " "

!*:30 ( $0 "

!1:00 $0 "!1:30 )( $0 "

(0:00 *0 $0 "

(0:30 )( $0 "

(!:00 ( $0 "

((:00 )0 $* "

((:30 )* 0 "

(3:00 ) 0 "

(3:30 ) ( "

00:00 *! 1 "00:30 " " 3.0

0!:00 *3 ( "

0!:30 St& /in i4o/td

8= 3: !"0$"0*

o Third acid tan'er co!ld not reach before 16.30 hrs leading to late

start.

o 4rain e9!al to three -ol!mes of mi:ing tan' started at 11 hrs

o *hemical addition

started at 1.00 hrs

30 liter &*l H 20 liters *oronil 213 special added at 100 hrs

00 ?g Ammoni!m bifl!oride added at 130 hrs

2000 ?g Thio!rea added at 1 hrs

completed at 1820 hrs

Unloading of acid tan'er

5irst• Btarted on 1830 hrs

• *ompleted on 1F30 hrs

• It" 1. (T

Becond

• Btarted at 1F hrs



• *ompleted on 2100 hrs

• It" 1. (T

Third

•

Btarted at 213 hrs• *ompleted at 2200 hrs

• It" 3.0(T

o Acid sol!tion started coming from dr!m -ent at 200 hrs

o Acid circ!lation stopped at 00.00 hrs

Acid Pic2/in% Proc44 :"

Ti& HC/ D- Iron D++& Cu D++&

I'L O'L I'L O'L I'L O'L

!):00 C<&ic/ ddition 4trtd

!*:30 !.$ " " " " "

!*:$ $.(* 0.!0* " " " "

!1:0 $.) !.0 " " " "

!1:(0 " " " 33! " !00

(0:(0 $.3 !.1 $3 !3* !!3$ ((*

(!:00 $. 3.) 3$( $($$ (13! ((0

(!:$0 $.) $. !3* $($$ (33! 3!0

(3:00 $. $. 1( )3)( 3$ 3()

(3:30 3.1 3.** )(0 )1* 3$ 30*)

00:!0 Boi/r drin 4trtd o//o7d 7it< N( c++in% D!)'0$'0*

0!:(0 Boi/r drin co&+/td

Tot/ Acid DHC/ Con4u&d ? 3(.000 MT

• 8= $:!)"0$"0*

8M 6tr Rin4 :"

Ti& T&+ +H



I'L O'L I'L O'L

0!:(0 8rinin% co&+/td nd 4=4t& i//in% 4trtd 7it< 8M 7tr

0$:$0 S=4t& i//in% co&+/td nd 2+t undr rcircu/tion

0:00 .) $. !.1 !.)

0:00 1.) $1.! !.1$ !.1!0:0 8M 6tr drinin% 4trtd o//o7d ;= N( c++in%

0*:$ 8rinin% co&+/td

o *itric Acid $inse

4( ater filling started ith steaming at 08 hrs

*itric acid 00 ?g dosing started 080 hrs

*ompleted at 0F0 hrs

Citric Acid Rin4:"

Ti& +H T&+. Citric Acid

Conc.

D-

Tot/ Iron

D++&

A&&oni

Addition

Din Litr

I'L O'L I'L O'L I'L O'L I'L O'L

!0:30 (.3 (.0 " " " " " " "

!0:3 3.! (.1 " " " " " " "!0:$0 .3 (.$ " " " " " " $0

!0:$ *.3 (.0) " " " " " "

!0:0 *.) (.( " " " " " " 30

!0: ).* (.( " " " " " " 30

!!:00 .3 (.3 $* " " " " "

!!:0 3.0 (. " " 0.03*$ 0.00)) " " "

!!:! ).1 (.( " " " " " " "

!!:(0 (.* (.0 " " " " " " "

!!:30 " " " " 0.0$! 0.0! "

!!:3 ).!$ (.! " " " " " " "

!!:$0 3.0 (.0 " " " " )(.* !!( )0

!!:0 .( (.)( " " " " " " "

!(:0 " " " " " " " " )0

!(:30 $. 3.11 *0 0 " " " " "

!(:$0 3.1 3.* " " " " " " "



!$:00 $. $.) " " " " !! (0) "

!$:0 8rinin% 4trtd undr N( c++in%

!:00 8rinin% co&+/td

Tot/ c<&ic/ con4u&+tion in citric cid rin4 :"• A&&oni ? 30 Litr4

Fir4t 8M 6tr Rin4 :"

Ti& T&+ +H Iron

I'L O'L I'L O'L I'L O'L!:0 8M 7tr i//in% 4trtd

!:( Circu/tion 4trtd

!):30 6tr 4trtd co&in% out ro& dru& 5nt

!):$ ) 0 . .0 !.* (*

!*:00 1 0 .0 .3 33 )(

!1:00 8rinin% 4trtd undr N( c++in%.

(0:00 8rinin% co&+/td

8M 6tr Circu/tion cu& Nutr/ition :"

o Boda Ash 2000 'g as charged at 003 hrs

Ti& T&+. D0C +H Iron

I'L O'L I'L O'L I'L O'L(0:!0 8M 7tr i//in% 7it< +rti/ drinin% 4trtd

((:00 Rcircu/tion 4t;/i4<d

(3:00 )( 0 .3 . ((.$ 33.

00:30 ** 0 $.! .0 ((.$ !!.(

00:3 Sod A4< c<r%in% 4trtd D!*'0$'0*

0!:00 Sod A4< c<r%in% co&+/td .+HDO'L ?.(



03:30 * 0 !0.* !0.* " "

0$:$ *$ ( !0.* !0.* " "

0:00 *3 ( !0.* !0.* " "

0:$ *( !0.* !0.* " "

0):30 8rinin% 4trtd 7it<out N( c++in%01:30 8rinin% Co&+/td

• 8= ": !*"0$"0* to !1"0$"0*

o 4( rinse ith sim!ltaneo!s draining started at 0F10 hrs

o 4( rinse contin!ed till 100 hrs

S=4t& Fi//in% 7it< Si&u/tnou4 8rinin% :"

Ti& T&+. D0C +H

I'L O'L I'L O'L

!!:!0 S=4t& i//in% 4trtd

!3:0 ( $1 1. 1.*

!3:(0 " " 1.* !0.0

!3:( $1 1.* !0.0

!3:3 " " 1.* 1.1

!3:0 0 1.* 1.*

!$:30 0 1. 1.)

!$:$ " " 1.( 1.)

!:! 0 0 *. 1.$

!:30 " " *.( 1.3

!:$ " " ). 1.(

!:00 0 $) ).( *.$

!:$ $1 $ *.* 1.!!):00 1 $* 1.3 1.0

P44i5tion St%"I :"



Ti& C<&ic/

Addition

DIn Litr4

T&+. +H H=drin Conc.

D++&



A&&o H=d I'L O'L I'L O'L I'L O'L

!):00 30 (00 " " " " " "

!*:00 " " )$ 0 1. 1. *$ **0

!*:30 !0 " " " " " " "

!1:00 " " *$ ( 1.3 1.$ 3) $!1:3 ! " " " " " " "

(0:00 " " * ) !0.0 !0.0 30 3*$

(!:00 " " 10 )( !0.( !0.( 31( $00

((:00 " " * ) !0.( !0.!* 30 3*

(3:00 " " 10 )* !0.!* !0.! 3( 3(

00:00

D!1'0'0*

" " 1! )1 !0.!* !0.!) 3( 3(

0!:00 10 *0 !0.! !0.! 33 3(*

0(:00 " " 1( *( !0.!) !0.!) 33 33

03:00 " " 13 *3 !0.!) !0.!) 3(* 3(*

0$:00 " " 13 *3 !0.!* !0.!* 3(0 3(0

0:00 " " 1$ *3 !0.!* !0.!* 3(0 3(0

0:00 )0 !0 1$ *! !0.(* !0.(* 3(0 3(0

0):00 " " 13 *3 !0.30 !0.(1 3( 30

0*:00 " " 1$ *3 !0.(0 !0.!0 33 3(

01:00 0 " * *! !0.(0 !0.!0 3(0 33

!0:00 " " *1 *( !0.(( !0.! 30$ 3(0

!!:00 )0 (0 " " " " " "

!!:0 " " *1 *! !0.( !0.!* 0 33!(:00 " " 10 *! !0.($ !0.() $* $$0

!3:!0 " " *$ )) !0.!0 !0.!( 30$ 3$$

!3:30 " " 1! *0 " " " "

!$:00 " " *1 *0 !0.0 !0.!$ 3(0 33

!$:$ )0 !0 " " " " " "

!:!0 " " 1! )1 !0.03 !0.0( 3$$ 33

!:00 " " *1 )1 !0.03 !0.0 3(0 3(0

!:0 !0 " " " " " " "

!):00 " " *) )* !0.0 1.1* 3(* 3$$!):$0 " " ** )* 1.1 1.* 33 3$0

!):$0 Rcircu/tion 4to++d DSt%"I +44i5tion co&+/td

!):$ 8rin 4trtd

!*:$ 8rin o 7tr circuit co&+/td

!1:30 SH drin 4trtd



Tot/ c<&ic/ con4u&+tion in citric cid rin4 :"

• A&&oni ? 1) Litr4

• H=drin ? ($0 Litr4

8= ): (1"0$"0*P44i5tion St%"II:

o 4eaerator chemical addition

&"dra<ine J 200 /iter

Ammonia J 20 /iter

8= *"1: 30"0$"0* to 0!"0"0*

o oiler light !p at 1030 hrs 30=0=2008

Ti& C<&ic/

Addition

DLitr4

Fd B6 FST R&r24

N(H$ NH3 +H N(H$

D++&

+H N(H$

D++&

+H N(H$

D++&

1100 7 7 10. 20 7 7 10. 80

1200 7 7 10. 230 10.2 16 10. 12

1230 0 3 7 7 7 7 7 7 Addd to LP do4in% t

J ;ot< LP do4in% +'+

t2n 4r5ic

1300 7 7 10. 20 10. 210 7 7

1330 7 7 7 7 7 7 7 7 Boi/r Pr44.? $0 >%'

130 7 7 10.2 32 10.2 26 10. 10

1600 0 3 7 7 7 7 7 7 Addd to HP do4in% t

HP do4in% +'+ A JB t

4r5ic1630 7 7 10. 80 10.1 2 10.2 128

100 7 7 7 7 10.2 32 7 7

1800 10 7 7 7 7 7 7 7

1F00 7 7 10.2 2 10.2 28 7 7

2000 60 7 7 7 7 7 7 7 $0 /itr4 to LP do4in%

/itr4 to HP do4in%



211 7 7 10.2 38 10.2 32 7 7

2230 30 7 10.2 0 10.2 28 7 7 Addd to HP do4in% t

0030D0!'0$'0*

30 7 10. 6 10.2 32 7 7 Addd to HP do4in%

tn2 .HP 8o4in% +'+

i4o/td

0230 30 7 10.2 6 10.2 28 7 7 Addd to HP do4in%tn2 .8M 7tr i//d

;oi/r

030 0 7 10. 0 10.2 28 7 7 Addd to HP do4in% t

0630 7 7 10. 6 10.2 28 7 7

000 0 7 7 7 7 7 Addd to HP do4in% t

081 7 7 10.3 10.2 28 7 7

0830 20 7 Addd to HP do4in% t

0F1 7 7 10.3 10.2 30 7 7

0F30 30 7 7 7 7 7 7 7 Addd to HP do4in% t

101 7 7 10.3 6 10.2 28 7 7

1030 0 7 7 7 7 7 7 7 Addd to HP do4in% t

1100 7 7 10.2 6 10.2 1F8 7 7

11 20 7 7 7 7 7 7 7 ! /itr4 ddd to HP

do4in% tn2, /itr4 to

do4in% tn2

121 7 7 10.2 10.2 3F 7 7

12 3 7 7 7 7 7 7 7 Addd to HP do4in% t

0100 7 7 10.2 6 10.2 32 7 7 "

0130 7 7 10.2 6 10.2 28 7 7UCB #3 74 inor&d

;out t< in/ r4u/t.

0210 7 7 7 7 7 7 7 7 LP do4in% +'+ A JB ,

do4in% +'+ B 4to++d

o C<&ic/ ddition durin% 4t%"II +44i5tion"

H=drin ? 0 Litr

A&&oni ? )0 Litr

Tot/ C<&ic/ Con4u&+tion in Boi/r Circu/tion nd SH i//in%:"



Documents

Report on Acid Cleaning