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.2 ndsessional exam 2012
Batch 6th semester 3'd year(power engg)
f ull marks : 30
Time :1.5 hourO
Write down the procedure for taking 1't mill operation .Also write the
permissives for anY mill 0P.
.ko -t\1r- Dl, <\,
^ I EFprcr^t)2at.- "*2.to tto 2 ,r rltr., :bi:,\iu"*1@i
a{ writ" down the procedure for handling emergencies
, \6n,- I D fan triPPed.
17Oru*Write down the procedure for raising the load from block load to full
load .
(b) level low.
y'r,rrr"down the procedure for planned shut down'\-/
',t:-#i,,. s ,' ^!I,'ru*'
Badarour. New Delhtil{Dll4.2
ndsessional exam 2012
ower plant o
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i\i AT r oNAL po \.vri R -r.RAr NiNEIN,ISF;;;6ilI],\D/\r{rt rr, rilj\\ l)rLur _ r ruoi.r. - ."^','
!PCOND TERMINAL DXAMINATION
'I'lME: 90 ilIIN.
ATTEIIPl ALL et, ESTIONS:
,-,2 Q L \\'h l is the meanirrt 0l.pLrr.lirrg, Horr rr rr:irir-, r:: u,,r)L:. ..\,:le tjtrr.r rr :rJl l, ,r,.:a ire,.n,i"*ir.,.
(.)1. llorr c,,rrrienser rircurrrrr prrllirrr: is rlr,rrt.. \\.rjtc rir,rrl.r' pirss. l'rrrrrrrll ls u()ll(: \\'r'[c liorr'tt tilr: ;lt'ttcctlrrtr: iill chalging ol'i]l)il.l)
-.Q{ .tt'';ttdor'l n lh"\ Prueedtlc ol tLrrlrirre ''llirl lion.: barrinr.: uea" t(,:ivncl:r\)tiization !!.r.cssa oi.7 culd start t,p.
0 " [""'u
e/d33w
Porve{ Piant Ope+,ation
NP-l'l ltadarpur
,\ ilii T, I est.
[\,1- j{)
r\ll rlucsiirrrr ,:urrv etlrral nrarks
.\nsrr,.:r' an1. tlrrcc,
I 1 rvhat.is tlre, secluence o1. takitrg anr i;ii clevation in serrrice? Wlrat ar(j tlic igrrition' pernrits lbr,taking nrill in scr.r icc,.)\\ihat arc the boiler tr.i1t conclitionr;i.)
l) r'hat is tirt': pr.ced u rt' rb'estabrisrrinr: (lrari s)srcnr,r write cror', trrc stcps lirr.hoilct lislrr up und loaclirru.
\r hilt lirc rh(. dil'tl[,.:l,l-f.1l:"
ol'l](]1. \\ir r] antl colcl srarr up of urrit..r Wirrc cltnvir tlic__
,--F'--:'=\-- i)- $/ilh,a rrrrat skctcrr crescribe tire opei'ati.n or'startirrg device and
i) l)rau,a n:i( skclch ol.tur.birre lLrb,.,il s.vsent ancl explain.)
6) what at'c tlic littrctirrrts.Itlitlc.crrt.ils iri::,rrcrrrirg sl,slerr circLrit. What.r.etlrc
:
I
j
f,-: ..
1,
'trk,Jt niirt totr Lt.tt"t Rtr!xo:n'e:tt)
I,<.W'-""- , (z)
\-/' ^ r r --., i. .ranm nressure conrrolled?{'
@r'tois,aboilcrmasrer?HowissteamT::_"-::.r"r"";.'' (8)
(8)
u-z ""--' , Procedure ofa
--ai Od4escribe the Purge Pcmissions
and sraa-ur
(9X- _/v...-.\..==-"a<armraalrF-aei9_(7)
(5x3=ls)
1ftf $t"stsnc urL'E r
rts used in a steamttltti* G)
e.6 slafDiscuss some supewisory and control i'"tt-* *[];i;;rr-;Dt'rl
't'-t thods oltrrrbine govemi,g' U!1!:-1-Yr'f^:-ry:::
j!)-l-:xplain tlrc dillcrent me .--.^ -,-ffi
cusllFre
# ;.:i:'::ii:;'oir',-.'.'n o r a turbine'[**]# ult'"'*tlgt'l*cks
ror a b' irer
i, .., SitPl 'arrn.fiw t:to Ron lio. rnandlerrtfti
- - - "'t
- ,.i i-, .:.r"
ENnl I)l\-t-r-; -.*.
, (5)(10)
ar..a|talrrra*a
9,p-
(5)(s)(s)
?)'*t
Q.:
tbl:
(a)(b)
/
*oa aott xo. .?-.1'7'!'2-1.
MIf'{ATlOI.{
ffi ,, 1,r.,"1ia ii n'' in' cdra no!i1d'9f l-ur*le'(lnt
l:xPlurtr .: ,,,
i ii ' ' of etec3iiiiai;supply to various auxiliaries '" '
tnnl::'Whatiisthearrdngement , i t:, ;, \rriWnatils trrE ar'e"v-' , i .i l, ;'i t t'
Povreir Station? i .! "' :
Draw a neat diagram lor Lub Oil Systemof a 2i0 hil\'V TG Set and u)(o"t'ni:ll
,rn",,o^ of various conrpbnents iF the system'
:i, .n? Ho.v vro'-:1,'1 vr-' -: ; : e '' '
What are the .'start .pernrissives' for starting PA 'ant Hoiv Y'u.rru '' ' " (i '- r
,pri.r.y Air Path and Sec Air Patlr?
'' i gtlicr Feecl Prrl'r:;:? (1:'!
r-t' \^Jhat are th; checks made beloJe startirrg o{ a. - : : )'(9' "' '"'- - - -^.^^,,^.. ;f BoilLr Feed t'triup?
o.6
(9' What are the Protections of.:.
and LP l5YPass'.;lsie'-'r? . .:
deiectihg Reheater I uuE rEcr\.iY-' ratot with the Grid? \:
,d ;.;t;;" procedure for synuhronizing Gene
1' (ix3r i
O.7 Write short notes on anv throe of the iollowlng: -
rl.r ',otaBiP i
w\ Routihe ""T;;:tconrrorpircrVar*e'rh) , Frrnctions of t'<
lntrolling Steam temperature /A h4ethods t", "TJ;':;; .on u*,,r{ot s,.arr,, or rurbine 1
' 9( Diiierence bet i
'nd Bciler Loading"
A/W"toin Oeiait the proc€dure for Boiler Light tr) a
(
'tltttt:*rt+'
I'o Reheater Tube
i
i
I
'lrt1til:ilii I
ir
trv:
(Pleasc tvrlle low Exam PoII No.) .
with a neat sketctr.
n all the points related to ATRS, T.S.E. and synchronization(15)
Explain the functioning, operation and protection-of HP/LP by pass system with a
ExamRo Nad-)Il533lo9'
(15)
(15)
(15)
(15)
- ---r_r-j , n .* -r., i;
(15)
(5x3='t5)
t
'Ii'Q1 : Write a short npte on the following: - i (5x3=15)
(a) Prechecke! before availing the electrical supply to the equipments.
(b) Stan up of A.P.H. and testing of interlock!{th air motor._ ('
i(a) Start up procedure of l.D. fan and F.D. fan.
o Q2 Mentiol and Explain all the boiler protections.
, Q3 Mention all the steps for cold start up'of 210 MW unit boiler.
uO4 Write a shortinote on,'F SS.S/B.MS'
05 Mention all the for the followings: -
for 210lrlW- unit"bol$I.._..* -
for210 MWunit.
(c) B.F.P. Start
..!9-' ExPlain T oil system for 210 M,W unit with a neat sketch. (15)
9e--os
neat sketch.
Write short notes on the foilowing: -
(a) Sta$ up procedure of C.W. PumP.
(b) Conf enser bacUfront charchings.
(c) Condenser vacuum pulling system.
Ql0 Explain the following: - (5x3=15)
(a) Why Turbine should run on turning gear before condensei vacuum pulling.
(b) Why Optimum back pressure for the turbine is preferred.
(c) Etatic excitation system.
(a)
(b)ll,
*{'
P5:
Q7 Mention andprocedure.
_T
m.ct nl,r,;. tp4r'fuotn fu)U No,) Ex,,rn Rott No...9.f 5.-.........
Subtect: Paiaer Plant Operatlon i
2o07-2006)Mdxlrnurn
Eup Tpnm ExannrnATrou
Codz: EfiP&3O6
: 3 ,foura
Atxrs 8E
Subject: Powet Plant Oryration
Note: Afremqt anv lfue quesdons, All quesaons carry 15 marts each.
E** R t t N". I *6.fi-.\.5 3 B 7da
Q1
Q2
Q3
Q4
(Plcase wfite lo r Exam Roll No.)
ENo Tnnnn ExavrnvarroN
Explain tl.e bus bar arrangement to export ttre power generated byelectrical generator to the grid and import of power from grid to run theauxiliaries. Also, discuss the interlocks and protections involved in ttrisarrangement,
Write the procedure to shut dawn the boiler on account of tube leakagein water walls. Also discuss the interlock and protections related to this.
Explain the use of compressed air in the plant. With the help ofschematic diagram of compressor house, explain working of compressedair system.
Assuming that tJle plant is operating at full load with required number ofpulverisers in operation. If suddenly one pulveriser develops someproblem, explain the procedure to change-over the running pulveriserwith the stald by. Also mention the precautions during this operation.
Explain in detail about.F.S.S.S.
Explain procedure to take feed heaters in to service and write theinterlocks and protections related to feed heater level control.
What do you mean by HP/LP Bypass system? With the help of schematicdiagram explain working alongwith interlocks and protections of thesystem.
Explain different type of Excitation system used in 2O0/50O MWgenerator. Make schematic diagram also.
. Q9,..'E;xplatn tJre procedure followed to shut down the turbine from fu1l load tot-../"' put on barring gear and finally to complete stop for maintenance.
Q 10 Explain operation of any two of the following:-
(a) Furnace draft control
(b) Drum level control
(c) Cold end temperature control in air pre heaters.
_6-{
,V
*d
e
Exdm Ro, no. . P.O-P-$.9.?.7 A
Eup T-pnu ExenrruATrouMAY JurE 2o11
Codc: ETPBSOG PottEr PkintTlm,e : 3 llours Moxlmum Mar,.s ; 75
Notc: Sectlon-A and Sectlon-B ls
SECTION-A (15x4=60l
v What are the pre requisite conditions to synchronize a Generator withthc grid? Explain in brief the procedure for synchronization of a2 I OMW Generator.
Why purging is required in a Boiler? Write the permissivespurging? Describe in brief the boiler pre light up activitiessequcnce) for a 210MW Boiler.
,6, why HP/ LP bypass system is provided in a thermal power plaat?Dcscribe HP/LP by pass system for 210MW thermal power plant withncat skctch.
Why hydrogen gas is used in a large turbo-generator?hydrogen cooling system of a 21OMW turbo-generator?procedure to Iill up hydrogen in a Generator.
Mention any two emergencies during operation of BowIThermal Power Plant. Also, describe in brief the correctivebc taken -
for(i,
DescribeWrite the
Mill in aactions to
Qs
Q6
Q7
Wl.at are the differences between nozzle governing and tlerottlegovcrning system? Explain in brief the operation of Governing systemwith ncat diagram for a 210MW LMW or KWU T\rrbine.
What do you mearl by differential expansion and axial Shift withrcfcrcnce to steam turbine? Give maximum limit of these parametersfor 2IOMW LMW or KWU Turbine.
Why gland sealing system is required in a steam turbine? Draw a neatdiagram of gland sealing system of 2J.OMW LMW or KWU Turbine.
Q8
.,.wfitemost appropri"," "rr..""." ffiffi.ru,- (lx15=151
Q9 Thc minimum air flow required in the furnace for its purging shouldbc-
(a) 5% of total air flow (b) l0% of total air flow(c) 30% of total air flow (dl 600/0 of total air flow
Q I o At full load condition the boiler wind box to furnace differentialpressure is maintained at-(a) 40mm wcl (b) 10omm wcl (c) 150mm wcl (d) 2OOmm wcl
Ql I In a 21OMW pulverized coal frred boiler, the ignition enerry forpulvcriser will be available when-
P.T.O.
Q,\P"-
a-2-l
(a) Minimum one oi1 gun (out of four) of adjacent elevation proven intoservice.
(b) Minimum two oil gun (out of four of adjacent elevation prove intoservice.
(c) Minimum three oil gun (out of four) of adjacent elevation proveninto service.
(d) Minimum four oil gun (out o{ four) of adjacent elevation proven intoserrice.
q@ foUo*i.,g is not tJ e start permissive of BFp-
Q13 At normal load condition the mill outlet temp is maintained between-(a) 45-5ooC (b) 75-8O0C (c) 95-roOoc (d) tos-11OoC
Q14 Before closing circuit breaker of 2LoMW Generator, its isolator onboth sides should be-(a) Closed {irst (b)Opened first(c) Kept open (d) Isolator is not provided
Q 1 5 F\rnacc draft is maintained in normal running condition-(a) 1O to 2omm wcl (b) -S to -10mm wcl(c) -I5 to -20mm wcl (d) -10 to +1Omm wcl
Q16 Starting sequence for pre light up procedure is-(a) ID Fan, FD Fan, ApH (b) FD Fan, ID Fan, ApH(c) APH, ID Fan, PD Fan (d) ApH, FD Fan, ID Fan
Ql7 If the quantity or ecrrnbrlsEofr aii in6ieasEs'6eyond optimum excess air(a) Pcrccntage of COu in the flue gas increases(b) Pcrccntage of Oz in the flue gas increases(c) Pcrccntage of CO in the flue gas increases(d) Both (a) and (c) are true.
Q18 Starting sequence of a milling plaat is-(a) P.A Pan, Mill, Feeder and Seal air Fan(b) Scal air Fan, Feeder, Mill, p.A. Fan(c) Seal air Fan, PA fan, Mill, Feeder _.x-(d) P.A Fan, Seat Air Fan, Mill, Feeder
Q19 I,,'ill in t].e blanks with reference to 210MW thermal power plant at100% MCR (maximum continuous rating)(a) Value of Drum Level Very High causing tripping of Boiler is .....mm.(b) Value of Furnace pressure Very l,ow causing-tripplng of goiter is
..-..mm wcl.(c) Deaerator water temperature is normally ....,...0C.
.,-pl Gcnerator terminal voltage ......... KV.'41 Hzgas pressure inside generator is .........kg/cmz.
(a) Scoop tube minimum(c) Suction valve open
(b) Lub oil header preFsure normal(d) Discharge valve open
Q'fQ*
