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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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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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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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THAN( YOU