Presentation Reverse CO2 Compressor_Rivised

5/26/2018 Presentation Reverse CO2 Compressor_Rivised

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Reverse rotation inCentrifugal Compressor

CAMAU FERTILIZER PLANT

Nguyen Thanh Linh - P.KTBD

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1.Specification of CompressorItem No. - K06101

Service - CO2 Compressor

Type - 2MCH606 + 2BCH306/A

Gas Flow kg/h 74,858(LP)/77,089(HP)

Suction Press. BarA 1.4(LP) / 20.75(HP)

Suction Temp. deg C 45(LP) / 45(HP)

M.W. kg/kmol 41.85 ~ 43.40

Disch. Press. BarA 21.55(LP) / 158(HP)Disch. Temp. deg C 116.3 ~ 207.7

Speed rpm 7610/12953

Train BHP kW 9116

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2. HIN TNG BT THNG I VI MY NN CO2 V CCNGUY HI C TH XY RA I VI MY NN.

2.1 Hintngquay ngc.

Trong cc lndngmy theo ESD th uc hintngquay ngcmy nn, vcghi hnh li. Tnh tngy 25/01/2102 nngy 1/06/2012 c 17 lnmynnbquay ngc.

Nguyn nhn: khi c dng kh tura my nn dingcvuht camynn s to ra mt lc chng li schuyn ngca rto, v tc ng lm rtodnglinhanh v quay ngcnulcln.

2.2 Cc hhngxyra khi my nn quay ngc

A. HngDry gas seal: do drygas sealcthitkl loichcho php quaytheo mt chiu (uni-directional) nn nub quay ngc, dng kh seal skhng ivo ccc rnh trnbmtseal -> bmttnhv ngkhng cdng kh phn tch v gy cstbmt,lm tryxc, mn v hngbmtseal, rung ngcao.


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2. HIN TNG BT THNG I VI MY NN CO2 V CCNGUY HI C TH XY RA I VI MY NN.

2.2 Cc hhngxyra khi my nn quay ngc

B. Hng Journal Bearing: cc journalbearing c thit k theomt chiu, nu chy theo chiu ngc li s khng hnh thnh cmng/nm du,v lm cho trcbcst vobmtbc(bmtlmbng

babit rtmm, v nng chykhong125o

C).

C. Hng cc phn bn trong ca my nn: nh cc Labyrinth vrotor.


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3. CC GII PHP KHC PHC CC H HNG KHI CHA X LC HIN TNG QUAY NGC CA MY NN,

3.1. KhcphcvichngDry gas seal:

c thchnloidry gasseal chuynngc2hng(bi-directional) nhhnh vbn.

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3. CC GII PHP KHC PHC CC H HNG KHI CHA X LC HIN TNG QUAY NGC CA MY NN,

3.2. Khc phc vic hngJournal Bearing

Thay i logic khi ESD

s tng p sut du bi trna vo , mc ch tomng du khi trc b quayngc.

Thay i thit k i vi

journal bearing chn loicho php rto c thquaycchiu.

.

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3. CC GII PHP KHC PHC CC H HNG KHICHA X LC HIN TNG QUAY NGC CA MY NN,

3.2. Khc phc hng ccphn bn trong ca mynn.

Chuyn i vt liu cho cclabyrinth tvtliuhpkim nhm sang vtliu

polymer composite.

v dloi:The D-R 13HTPolymer Composite

Advantage.

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4. P HN TCH TNH TRNG QUAY NGC MY NNSDNGSYSTEM 1

4.1 Dliusystem 1 sau khi modify lilogic mvan 06PV1017khi my nn TRIP.

Sau tbodngmy nnHP CO2 vo thng 4, v chylinh my. Vo lc13h5222 ngy 22/05/2013nh mybTRIP do scmtinton minnam. Saukimtra trend vntccamy nn thymy nn HPdngritngtcliln 6162v/p ( Emergency stop ).

Trend vntccamy nn

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4. PHN TCH TNH TRNG QUAY NGC MY NNSDNGSYSTEM 1

Theobiu fullwaterfall th thnh

phnrung ng1Xchuyntforward

precession sang

backwardprecession ngay saukhi vntcmy nnv0 vbtngtrliv gibackward

precession cho nkhi dnghnmynn.

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4. PHN TCH TNH TRNG QUAY NGC MY NNSDNGSYSTEM 1

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Trckhi my nn gimtcvn0 th ccorbit caMy nn HP chngforward

precession.

Sau , khi tcmynn tngtrlith ccorbit camy nn HP c

hngbackwardprecession cho nkhidnghnmy nn.


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5. CC D LIU V CNG NGH V SUY LUN CA PHNG KTBD.5.1.Bng thu thp v p sut ca cc cp thi im TRIP vo ngy22/05/201 ly mu 10s.

STT

Date Time

1st Suction

Pressure

PI0210 (bar)

1st

Discharge

Pressure

PI0261 (bar)

2nd Suction

Pressure

PI0262 (bar)

2nd

Discharge

Pressure

PI0211 (bar)

3rd Suction

Pressure

PI0212 (bar)

3rd

Discharge

Pressure

PI0263 (barg)

4th

Suction

Pressure

PI0264

(barg)

4th

discharge

pressure

PI0213 (bar)

Remark

1 22/05/2013 13:52:41 0.361 3.54 3.29 22.397 22 83.02 82.56 158.565

2 22/05/2013 13:52:50 0.361 3.5 3.36 22.398 22 83.02 82.56 158.565 Bt u trip

3 22/05/2013 13:53:00 1.503 2.05 2.02 6.287 19 56.21 56.23 57.013

4 22/05/2013 13:53:10 1.125 1.23 1.18 1.369 6 36.59 36.62 20.018

5 22/05/2013 13:53:20 1.007 1.36 1.36 1.537 4 23.53 23.55 12.589

6 22/05/2013 13:53:30 0.938 1.4 1.35 1.838 2 14.51 14.49 8.825

7 22/05/2013 13:53:40 0.805 1.27 1.21 1.263 1 8.6 8.56 4.865

8 22/05/2013 13:53:50 0.701 1.07 1.01 0.911 1 4.93 4.89 3.114

9 22/05/2013 13:54:00 0.65 0.91 0.86 0.739 1 2.72 2.67 2.096

10 22/05/2013 13:54:10 0.575 0.78 0.72 0.597 1 1.46 1.4 1.15

11 22/05/2013 13:54:20 0.512 0.67 0.62 0.526 1 0.83 0.77 0.769

12 22/05/2013 13:54:30 0.471 0.58 0.52 0.465 1 0.58 0.51 0.589 Dng hn


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5. CC D LIU V CNG NGH V SUY LUN CA PHNG KTBD.5.2.Theo nh cc d liu thng k ta c th thy:

a. Trong qu trnh my nn hotngbnh thngth p sut u ra cp 3 lunln hn p sut u vo cp 4. Nhng sau khi b Trip th thng s l ngc li.Nh vy c th c dng kh chuyn ng ngc li t cp 4 v cp 3 v i theong van Blow off 06FV0203 i ra ngoi mi trng.

b.p sut ti u ra cp 4 cng c a ra ngoi mi trng thng qua van blowoff PV1017 & PV0203, nhng theo s cng ngh n cng c gom vo cng1 ng l u ra cp 2 v ra ngoi mi trng khi van 06FV0203 c m honton.

c.T thiimTrip (tuabin khng cn dnng; lun c s chnh lch rtln

giap sutuvo cp4/ura cp3 so viuvo cp 3do p sutuvocp3 cngcgiiphng rtnhanh qua PV0203) cho n lc cn bng p khong 0.5bar mt mt thi gian khong90~100 giy.

d. Sau khi Trip p sut u vo my nn tng t 0.356 bar ln 1.187 bar.


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5. CC D LIU V CNG NGH V SUY LUN CA PHNG KTBD.


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5. CC D LIU V CNG NGH V SUY LUN CA PHNG KTBD.

5.3.Gi thit ca phn tch qu trnh chuyn ng ngc ca my nnda trn cc thng k thng s cng ngh nh sau:

Khi my nn Trip, my nn khng cn c Tuabin dn ng th dng

kh thot ra ngoi mi trng s c phn b nh hnh v. Nu nnglng ca dng kh chuyn ng ngc chiu t u vo cp 4th vu racp 3rd sau qua my nn vuo cp3 lns lm cho my nnchuyn ng ngc chiu. Theo nhbiutrend speed, c thdng khny lm dng my nn trong vng 10~15 giy v sau lm quayngcmy nn ln titc6162 rpm, ri dng hn trong vng 3-5 pht(quay theo qun tnh carto).


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5. CC D LIU V CNG NGH V SUY LUN CA PHNG KTBD.5.4.Scc ngxkhi khi my nn Trip:


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6. SUY LUNCAHITACHI CHO HTHNGCNG NGHCAMYNN

6.1.Sdngshnh cy (Fault tree analysis sheet):


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6.2.Dingiivhintnglm quay ngcmy nn nhsau:

Khi m dngmy theo ESD (emergency shut down) th BOV PV0203 mnhanh v dng kh l cx thng qua van ny. Nhngrtnhiudngkh xnt HP compressor (c thbao gmccc ngd cakh).Biv p trong hthngHP lun cao hnpha LP (da theo cc sliuthu thpctDCS v cc trend vp sut). V vypha LP khng cngxkh (ttnhin c thkh vnd qua van mtchiu). Lc dng kh caLP sbgilitrong hthngbivan mtchiuuracp2 camy nn (n cngl l do lm cn bngp sutrtnhanh caLP). Dng khbchnlischuynngngctrliuvo camynn. V tora dng chyngc,dng ny tora lchm iviLP rotorv l nguyn nhn tora chuynngquay ngcmy nn trong mtthigian ngn.


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6.3. SP&ID:


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7. SO SNH P&ID MY NN CO2 CAMC MAU V MPH M

7.1.P&ID my nn CO2 mPh M:


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7.2 P&ID my nn CO2 mC Mau:


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7.3.imkhc bit:A.Vtr lptvalve BOV 06PV0203.

B. Theo nguyn tc thitkm Hitachi xc nhn l: van mtchiu (check valve) vBOV giamy nn LP v my nn HP trn cng mtline l khng cchpnhn.

Thxc nhncaHitachi:

I found the remarkable different point in your system. Namely check valve and BOV

between LP and HP compressor.

We reviewed through in our CO2 compressor experience list and found that we have

never applied the both check valve and BOV in the same line between LP and HP

compressor except for your plant. Because this is NOT our standard.Please be advised one more point that the inertia (GD2) of LP rotor is much bigger than

HP ones.

Yoshimatsu


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8. CC GII PHP KHC PHC TNH TRNG QUAY NGC CA MY NN

8.1 chuynvtr lptvalve 06PV0203 theo sP&ID modify nhPh M: Bn CN cn tnh ton k xem v tr BOV c thc s nhhngnhintngquay ngchay khng.


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8.2.Lpvan mtchiukhonggiaura cp3 v uvo trao inhitE06121:


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8.3. Bn CN tnh ton lngCO2 tXngAmonia qua c cung cp cho my nn dng normal stop khi xngAmobtrip hay khng. Mcchl hnchtiacc trnghpdnndngmy khncp(tnhirtnhiunthit

b).

8.4. Thay ilogic cho van FV2351 ngchmhn15s mcch c mt lng hi LS vo dn ng cho Steam

turbnine chuyn ng cng chiu, chng li lc reverserotationcabn my nn (khng khthi do nghiLS ttrcnnay vnkhng sdng).


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9.KT LUN

9.1. Hintngquay ngccamy nn cxutpht tvicc dngkh chuynngngclitura cc cpmy nn chuynvuvomy nn khi my nn. Trong trnghpmy nn khng c Steam turbinehocngcdnng, th vicquay ngccadng kh stolcv tc

nglm hm chuynngxui camy nn.Nulclnslm mynn tiptcchuynngv sau my nn schuynngtheo lcquntnh v ngngli.

9.2 Vicquay ngccamy nn gyra rtnhiucc hhngnhdrygas seal,journal bearing, lybarinth ,

9.3 C thkhcphcvichhng cc bphnmy nn bng cch sdngcc thitkmiktrn.


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9.KT LUN

9.4. Ccphngn c thgimsquay ngccamy nn.

9.4.1. Lpvan mtchiutiuvo cp3 camy nn.

9.4.2. Modify livtr van BOV 06PV0203??


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CHN THNH CM N
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Presentation Reverse CO2 Compressor_Rivised