unit shut down procedure.ppt

8/9/2019 Unit shut down procedure.ppt

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January 20, 2015 PMI Revision 00 1

UNIT SHUT

DOWN

PROCEDURE


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Presentation outline

Planned Shut Down procedure

APH Washing

Hydrogen purging

ATT


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UNIT SHUT DOWN

Planned shutdown- For overhauling

!ergen"y shut down- #oiler tu$e lea%age, !a&or

'ro$le!s in (ur$ine, )enerator et", (rans!ission

"onstraints*

Reserve shut down +ow de!and


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lanned shutdown

Preparation for shut down*

Mo$ili.ation o/ resour"es /or overhauling- Man'ower ,

'ares, "onsu!a$les

Identi/i"ation all Jo$s to $e "arried out* arry out 'er/or!an"e testing and identi/y 'er/or!an"e

ga's, 'ara!eter deviations and a"tion 'lan /or re"ti/i"ation*

e"essary "learan"e /ro! R4$ul% "usto!ers*


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"tivities

ll "oal $un%ers should $e 're/era$ly !ade e!'ty $e/orelong shut down* to'4 regulate "oal /eeding to $un%ersa""ordingly*

harging o/ au6iliary stea! /ro! other unit*

nsure availa$ility o/ all oil guns*

(a%e trial run o/ all e!ergen"y e7ui'!ents li%e " "annerair /an, 8P, 8P, ) set et"*


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Redu"e "oal /iring in !ills and $ring down the unitload to 190 M:

)radually redu"e $oiler stea! 'ara!eters ;stea!

'ressure and te!'*< /or /or"e "ooling* Rate o/redu"tion to $e "ontrolled as 'er the 'er!issi$leli!its* nsure that the ( !argins are 8=*

arryout $oiler soot $lowing and P> soot $lowing*


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et tur$ine load gradient at 5 M:4!in*

#y'ass tur$ine stea! te!'* low 'rote"tion*

he"% >P4P #y'ass o'eration*

harge 4 'egging stea! /ro! R>*

ut out the to' !ill *Ma%e the $un%er4/eeder $elt

e!'ty $e/ore sto''ing the !ill*


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ut out >P heaters 5A9

Redu"e unit load to 120M: a/ter ta%ing oil su''ortin # elevation*

ut out one !ore !ill and redu"e unit load to @0M:*

nsure that tur$ine gland sealing stea! te!'*B250o and "hange over /ro! lea% stea! "ontrol

to seal stea! "ontroller*


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January 20, 2015 PMI Revision 00 C

hange over unit $us 'ower su''ly /ro!D(s to station #us *

Monitor and re"ord all tur$ine su'ervisory

'ara!eters li%e tur$ine $earing and sha/tvi$rations, i// e6'ansion o/ >P(, IP( AP( ,6ial shi/t , 8ver all e6'ansion (ur$ine$rg te!'* at di//erent loads*

Monitor $oiler dru! (o'4#otto! di//erentialte!'* while redu"ing 'ressure and load*


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8ne set o/ I ,F, P /ans and one #FP "an $esto''ed*

ut out one !ore !ill and redu"e load to 50 M:*

Redu"e load to 30M:* 8'en >P $y'ass to!aintain $oiler 'ressure*

utout P heaters*

nsure "hange over o/ dru! level "ontrol /ro! highrange to low range*


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(ri' the tur$ine through tri' 'ush $utton on des%

and o'en the >P4P $y'ass*

ontrol $oiler dru! level*

nsure the /ollowing a/ter tur$ine tri'*

)enerator "ir"uit $rea%er o'ened

)enerator Field $rea%er o'ened*

(ur$ine 8P has ta%en start at 2@50 RPM and u$*

8il 'ressure is nor!al*


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(ur$ine Es and IEs "losed*

>P ,IP "ontrol v4vs "losed

R> RE and all e6tra"tion valves and REs

"losed Monitor tur$ine s'eed, $earing vi$rations, $rg

te!'* and tur$ine su'ervisory !easure!entsduring "oasting down*

Monitor hotwell level, 4 level,ond va"uu!*


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DR o'ening o/ the /ollowing drains

>P "asing drain*

rain a/ter R> REGs

rain $e/ore4a/ter IEGs* REGs*

rain $e/ore e6tra"tion REGs

eal stea! header drain*

rain $e/ore EGs*


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to' the last !ill a/ter ensuring the /eeder is

e!'ty*

to' the P /ans and tri' the $oiler* ;#oiler "an $e

tri''ed $y "he"%ing any o/ the $oiler 'rote"tions*R> strainer drains to I# tan% to' "ondenser va"uu! 'u!' and %ill va"uu!*

8'en va"* #%r at 200 !! o/ >g "ondenser va"uu!


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Isolate seal stea! su''ly to tur$ine glands andsto' )*

Isolate generator >ydrogen "oolers tator water

and seal oil "oolers* to' one : 'u!'*

Monitor P tur$ine e6haust hood te!'* and sto'P a/ter hours

: syste! "an $e sto''ed a/ter hours /ro! unitshut down


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January 20, 2015 PMI Revision 00 1C

to' #FP a/ter dru! to' u' re7uire!ent is"o!'leted*

Isolate au6iliary stea! header*

Isolate 'ower su''ly to all >( drives and P* )enerator hydrogen "an $e 'urged a/ter the tur$ine

"o!ing to $arring gear*

t 2%s" dru! 'ressure o'en $oiler dru! vents, >vents and > hdr drains


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rain the $oiler when the $oiler water te!'* is

$elow C0o*

to' P> and s"anner air when /lue gas te!'*

$elow 100o*

Isolate all stea! su''ly to eaerator and drain

eaerator a/ter o'ening the vents*

Monitor tur$ine e6'ansions and "asing te!'*during "ooling down*


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(ur$ine $arring gear "an $e sto''ed at >P

sha/t4"asing te!'* less than 130o*

() oil syste! "an $e sto''ed at tur$ine "asing

te!'* o/ C5o a/ter ensuring that hydrogen is'urged out /ro! generator*

eal oil syste! "an $e sto''ed a/ter hydrogen

'urging and sto''ing o/ $arring*


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A H WASHING.

Pur'ose- /or "leaning o/ $as%ets o/ air heater

>igh 'ressure water &et is used

:ashing to $e "arried out when the air heater is in

hot "ondition ;(e!'*a$out 200o


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tart the P> water washing 'u!'s

8'en the water washing lines o/ the air heater *

=ee' the air heater rotating*

ontinue the washing till the P> o/ inlet and outlet

water is sa!e*

Run the I 4F /ans to dry out the $as%ets


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Hydrogen urging.

nsure that the generator is tri''ed "ondition

Redu"e the >ydrogen 'ressure to 0*5 = $y o'ening the

'urge valve*

onne"t 82"ylinders to the /illing !ani/old* tart /illing 82 through the 82/illing valve

ra"% o'en the 'urge valve to !aintain the "asing 'r* t 0*5

%s"

ontinue /illing 82till 'urity o/ C5 is a"hieved*


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Purge out 82$y o'ening the air /illing valve and

'urge out valve*

ontinue air /illing till 82 "on"entration is il*

is"onne"t the air "onne"tion a/ter 'urging*


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SHUT DOWN TO HOTSTAND BY

:hen the unit is to $e shut down /or short durationthe $oiler "an $e %e't in >ot stand $y*

hut down due to grid restri"tion

hut down due to 'ro$le!s in ele"tri"al syste!s,)enerator , )(, D( ,(ur$ine et" ;'ro$le!s whi"hre7uires short duration to attend inlet

is $elow 200o


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SWITHYA!D O "!ATION

o-ordination with R /or unit syn"hroni.ation,

line "harging et"*

ine u' o/ ele"tri"al syste!s

nsuring healthiness o/ swit"hyard e7ui'!ents li%e

trans/or!ers, $rea%ers, isolators, (s et"*


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SHUT DOWN O# T!ANS$ISSION

%IN" 8$tain written !essage "ode /or shut down o/ the /eeder/ro! R*

Inti!ate the other end station $e/ore o'ening the $rea%er* 8'en the !ain $%r*

nsure that the se7uential isolator o'ened on auto 8'en the re!aining isolators ;#us and line isolators< o/ the

$ay


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)ive !essage to the other end a$out o'ening o/

the isolators and "on/ir! that the line is isolated at

their end*

ee the line volt!eter and ensure that the voltagehas $e"o!e .ero

nsure the earthing at $oth ends


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harging o& trans'ission

line nsure the P(: has $een returned and ins'e"t the$ay 'hysi"ally

nsure that no is"harge rod4earthing "onne"ted

on that $ay )ive !essage to the R and other end station

and o$tain "learan"e /or "harging the line*

nsure o'ening o/ $oth end earthing


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/ter getting written "on/ir!ation /ro! other end

"lose all isolators o/ the line and "he"% their

align!ent*

yn"hroni.e the /eeder through the !ain #%r andthen "lose the tie $%r*

he"% the line 'ower /low *


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January 20 2015 PMI Revision 00 35

THAN( YOU

unit shut down procedure.ppt

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