Technical Paper on Tunnel View - Clinkering Line Capacity.pdf

7/27/2019 Technical Paper on Tunnel View - Clinkering Line Capacity.pdf

1/11

TUNNEL VIEW - CLINKERING LINE CAPACITYS S Kothari and A N UnnikrishnanCemtech Consultant Pvt Ltd. lndia

SUMIV1ARYRccent derelopments in cement indust4r' have witnessed the emergence of a number of ven' large

clpacitr plants of the tune of 7500-10000 tonnes per dal'. Most of thcse. dunng the last decadc. hare beeninstallcd in the south east Asian region. The first phase of such mega plants came into e.ristence in Japan in lheclrlr crghties b1 u'a1 of rehabilitation of the old large rvet/long dn' kiln plants into precalcination kiln units rvithsuspcnsion prc-heaters. This paper trics to naluate the technical concepts and the economic considerations ofthcsc mega uruts and compare the same tith other medium size units. Data collccted shou's that inrestmcnt. costdo txrt donn rrhcrc unit size goes up. Several plants hare multiple units in other unit operation defeating thcpurpose of large singlc lincs. Thc rate of reduction of lanable costs follo*s a as]'rnptotic cun'e. Ven large diamctcr kilns have problcms of high oralititt' migration. loading conditions & results in lower utilization. The-plants studicd in Thailand & lndoncsia shol a lnel of production lorrcr than thcir potential compared to plantsin lndia.I. INTRODTICTION

lri tltr; cottlcrt of rlpid grolth ol'Ccnrcnt lndustn in so'cral ol- the ducloping countries. anctllrcpriuctil ts ulrvtrs lltccd rr,rth a dilcrnnra rbout the sizc of a single clirftering linc as ucll as other major unitopcrlltir)n\ c r, crushrtt;i. grrndrng & scpirnlron. storagc ctc to be adoptcd. With plant sizcs ranging from singlcllrrcol'r50()'l(xXX)t/da\ ittAscancountrics.55()(,UdavinJapan. lolersizcsinEuropc.USA&l.atiuAmcricancolrtltrrcs (c\ccpt in lt le'rr cases) and rcn small sizcs in Chrna in opcmtion. rrhat future holds for tndia in thisrcspcrl t: lr srrb.jcct oI nruch intcrcst.' 'l'ltis papcr clrrclls on \anolls lspccts of sclc-ction critcria. e.g. operating & inrcstmcnt cost.rlllottitlizalion of opcration. influcncc on product nrir. risk ancl costs of scale up ol machincr-\ ctc.2. \\'HY VERY LARGE PLANTS ?

Basrc considcratiort rrhich pronlpts installatiolr of nrcga singlc lines can be traccd to- \/cn llrrgc dcposits of ratr rnaterial- Hrgh progrcssion o[dcntand' l.orrcr irrrcslnrcnl costS / t- l-orrcr olrcr;ltln.rl cosls- \lil\ ahcitd rn a ficrcclr corlpctitite rnarket- Rclr;tblc ittlr.stnrcture ro susrnn high dcnsitr supplr & nacuation channels. and' Conlidcncc of cquipnrcnt suppticr to Inect thc dutr condition

\otnc ol'tltcsc rrill bc dcalt in dctail rrhich nmv senc as basis fbr nrakinq a matris for decision


2/11


3/11

SEVENTH NCB INTERNATIONAL SEM//NAR ON CEMENT AND BIJILDING MATERIALS II-47Rarr Grinding Plant

- All mills are vertical roller mills- One mill - one kiln configuration - 19 Nos.- Trro mills - one kiln configuration - l4 Nos.- Larplest size - 6800 mm dia. table and 5000 kW polver

With wide lariance in grindabiliry properties of rarv material (10-20 kwh/t) and at times nith higherlnoisture. the size selection is frought n,ith risk. It is also obsen'ed that several vcrtical roller mills have beenrctrolittcd b1 rva,v of alteration in separation s-vstem indicating sub-optimal performance.

Grate CoolerIt is in this section that we hnd verl lide ranation in sizing bascd on grate loads. The fact that

ser cral nor large plants have opted for load of 38 llm'\z/d demonstrate the grel area. High heat rccuperation andiryrrlabilin of coolcrlorksatcrosspurposes. Manl havebcenrecentl.vrctrofitted. Thelargestcooleris of 262nr"2 gratc area sith a nidth of {.80 m.Clinker Grinding Plants

It is obsencd that all most all plants hare 2/3 clinker grinding mills and several of these are rvith highprcssurc grinding rolls for pregrinding. sincc lhroughput rcquirements are at the rang,c of 2(X) t/h and abor e. It islirrthcr found that po*cr sharing bct*een mill & roll prcss are still highlf incompatible. The entire technologl'ol this grinding $stem as lell as dcsign aspccts of roll press machine is under going changes. not u'ithstandingthc tirct thal first gcneration plants ucre built almost l5 lears back.

Coal Grinding MillsAll coal grinding mills are vcrtical rollcr mills and corporatcd as under :-

Onc kiln - onc millOnc kiln - tuo or more mills -' 23 Nos.- l0 Nos.

Packing & DespatchVcn huge multiple packing facilitics hare been built in Thailand & Indoncsia around small m/c ofll()0.15(X) bags / hr. In the absencc ofadcquatc rail nct. rcn'high pcrccntage is moved by road. Largctttor.cnrcnt of bulk cemcnt is not sccn. As against this. largc nnchines & substaintial investrnent arc madc inloldirrq br rail in India.

5 PERFORMANCE LEVELSPcrlbrmancc level of large plants in Thailand & Indonesia could not bc obtained c\ccpt for couplc o[plltttts. This is morc so in thc background of major dosn turn in ccmcnt dcmand in these countrics as ccononricrttclt-dorrn startcd hcrc in -3 r'ears back.With capacities in thc range of {5--17 million Va and donrcstic consumption of onlr 25.-30 nrillion t.ta.thcsc conlpanrcs in Thailand & lndonesia had no option but to c\port large quantit\ al vcn'lon ratcs. It uill bc

-.cr cr;rl rcars bcforc donrcstrc production & capacitl match.It has bccn possiblc to collcct orcrall capacitl utilization for.1 couutrics undcr rcvicl uhich is as urrdcr


4/11

II-48 IEuENTH NcB INTERNAqINAL SEMINAR oN IEMENT AND BU,LDING MATER;ALSTABLE.2 All fipurc in miltion Ue

1995 1996 | tggtt-I Installd - Indonesia; Thailand1 rndiaProduction - IndonesiaThailandIndiaConsumption - lndonesiaThailandIndia

24.337,50K.7623.t233.3764.5324.0s33.3060.43

l99t27.340.096.2524.6437.6569.925.4337.6567.36

33.642.010t.92

27.5076.7427.4473.0s

45.0748.60I16.56

22.3487.91t9.0779.76

47.(lN.AI 19.1023.92

100.4518.8 .92.0s

very low *ffiT*f,ff;:two 7500 t/dav kilns in Indonesia also indicted a row throughp.t rates as *rn as6. EMPERICAL CONSIDERATION

We have, based on data of operating plants as well as well estabilished crercrio rmdea,r ^'a -*:^r:rthrougbput,tui;"',ffiff ;:f ;ilij;ff"?:.l:tr#:l';:*Tlfl#Tffi ,Hh1;THfr [:;iln size' Here also' in 'iewof diffLrence in tength to diameter ,"uo ln"ryiog from LrD = l l to l5), its influences also projected' Though two support kilns with rJD nteof lo has been advocated for quite some time, actuallants in operation are still nery iet". 'lhe reason for this will also *oto no* be found in tne ract that it has lowhroughput potential, not withsranding good the.o,al etrci;;;;i*., *o.Thrurghput

Based on actual performanct. following emperical relationship can ghe a fairly accurate assessmentf production for a given geometrical size.a) Thermal load in kiln : 20x10^3 kcal / m^3. m. dia. hb) Tfuoughput :6tlm^3.dayBoth are on effective diameter of kiln.Operating data from various sources reveal:i) For kilns of diameter < 4m, thermar road is the limiting factor.ii) For larger kilns rvith diameter > 4nr, lolumetric loading rimits th output potential.iii) :}fitlrT *to 12000 to 13000 tpd can be achieved from a single kitn of diameter upto 6 m and an r-lDir') For same diameter, potential of kilns wirh higher r,lD ratio is larger than that with lower L/D ratio.

Performance characteristics of plants with kilns of 3.g0 m. dia. to 6 m. dia. is detarred in tabre -6.apacities atIJD rarios 15 and I I - grn* i;*.h case.


5/11

SEVENTHNCB 'A'TER'VATIONALSEI"'VAR ON CEMENT AND BIJILDING MATERiALS

Fucl ConsumPtionFor an1 installation consumption of fuel is depended

on number of factors like'

- Plant sizc- no,ufa of rau material- troe of fuel uscd- ;Jilt of stages in Preheater' and- iw or clinker cooler used'To arrire at theoretical fuel consumption lalues at various capacitv

basic paramcters have been considered:

a) Hcat of clinkerisation , #":#t oal of calorific varue 5000 kcavkgb) Fuel used : '.-L^^.^? -tddAc : ).i I..Io. or Preheater stagcs : )^' ^rint"'r 'n'rler : Reciprocating grate q'pc with beam aerated fired grates at inlet'd) Ti?eolclinkercooler : r(ssrPrr /q

MajorvariationinsPecifrcfuelconsumption.aseridentfromthetableisonaccountofthevariationin the radiation loss' It is obsencd that :ir Rate of decrease in fuel consumption drmrnishes as plant srz-e increascs' lf plotted' the cun'e takes an

3000 tpd to 5000 tpd50(X) tpd to 751,0 tpd75tX) tPd to l(XXl0 tPd

Thus. decrcasc in fuel consttmption for plants abor c 75tx) tpd ts nontinal onl"

rii) whcn k*ns *ith saure diamctcr. but of diffcrcnt L/D ratios are crlrulprctl. rr thcir optirnunr potcntial'fttcl consumption is highcr lbr loucr l-lD ratio'rr) \\,hctr contparistttl t,.; donc rrith sante rhrottglrprtt lerc|s. litcl consttntptrorr is |orrcr lt |orrcr.L/D rittto

flrisnlcans.toachicrcsllncpotcntialrhroughpul.dtantctcrotkilnsl,.ith|orrcrL/Drlrtioshotr|dbclrrg'cr co'rpurcd lo rlurt o[ hrrlhcr t-ro ,:rtio'in'tr.,. .,,i.',rr nrcga pr,urt*. rrrrcrc kiln cliamctcr is rlrcndr higlt'rirrthcr i'crcasc rn drirurctcr o'acco.rt of thc'bor; rcquirc rp.a,,ri-,ir,antlou. ils trrrs ruar lcarJ to poor ktlnlr lilatrrlrlrlltslltllatrort ol.a ('-Stegc prchcillcr clttr brrng dorrn thc litcl consuntptlon st|ll br 2()Kcal,,'k'g and rcducctltc tuttttntttnt consuntption lcrcl to t'75 Kcal''!tg clinkcr'

Ptlncr ConsumPtion\1xe rlic L1o\\cr constllttptiott in a ccttlcnt planr is largclr dcpcndctl on ltctors likc'- ttuth'rr.r[ !hltftlctcrlstlc- l\l)e ol recltrtologr ttsr.'d lbr srzc rctlttctiort and prro-proccsslll!l- llt\li1").luttlotl illld colltrol pltilcrscpln cttlplolcd

.\t lilrrcr plirnt t::tpltcitr lcrcls. spccr!rc po\\,.r noil,..llrdccr':lscs lts ptrtnt c'tpltcit) lllcrcllscs oll ilccortlll

trr ridrr..(r .lccrrullrrul rosscs. optrnl,u.r rrtih.rrtro. .f .rrrrc ";;.,a;.' .^4. tn111t; itltplcttrcittltlro' .f11s11.1s11,-,qr ttlorr :rnd co.lrol tcchtllqtlcs l'-tx c.p,rcrttcs ltborc itU"t-Ct"""pO' this is ll9 nlorC prcciscI

levels for comaprision' folloning

aslmptotic nature'ii) Dccrease in fuel consumption from ll Kcal/kg. 7 Kcul/kg and. I Kcal/kg


6/11

ft50 SEVENTH NCB INTERNAT'ONALSEI'''VAR ON CEITENT AND BU'I-D'NG ilATER'ALSapplicable, as in this case most of the unit operations, 9...ry pyro{toTs$n& are in multiple lines of smallercapacities ana innuence of material characteristic

is unaltered with capacity'Thu$- specific power in raw grrnding and clinker grnding sections of a 10'000 tpd plant wiu b comparableSfffJ"Hrlffi:#iil: also is armosr unaltered as it is proportional to unit weisht or clinkercooler..variationexpectedmainlyisinthepowerconsumptionofprelreaterfan.

Prhaterfanpowerisdependedonfactonlike,leakageair,systemprssuredrwadtype&calorificvalue of fuel use. Following basic ,rorllrp,ion, are, therefore, 'oid" to workout comparative prehater fan powersat varYing caPacities :a) Orygenlevelinpreheaterexhausgas : ltlo/o'b, pteleater sysempressure drorp : 450 mm wg'c) Fuer used : pulverised-coal of calorificval'e 5000 Kcar/kg.Salient features noted are :i) If plotted the curve takes an asymptotic natue. Saving in porvr decreases as plant size becomes larger'ii) Difrerence in spocific power consumptionbetween

3ooo@- 5oootpd = o'l2kwh/tonne5000S- 7500tpd = 0067500 tpd - 10000 tpd = 0'03

Thus. at higher plant capacities. thc adlanlage narrorvs down to negligible levels'

7 AVAILABILITY . CAPACITY UTILIZATIONplant availability / capacity utilization is a very important ear-anqter' especially in projects of high

investrnenr and bonowing, as rhe p."iltilit of the r"1't J.louerv related to this' Availability / capacityutilization de,pended on ilrmerous factors like'- machinery rePairs- refractory rePlacement- Powr scenario- market flucturations etc'

In the absence of performance data of maga plans in this regar4 some basic factors that inlluence theoperational "u"itruili y of pl-ants in general demand the attention The'y are

:

i) scaling up of machineries for operations like comminution' pyro-processing' heat recuperationseparation etc ha\ presented probluns during constnrclion as well as operation'

ii) Large diameter kilns exhibit :high shell ovalitY- higher migration (rolling between tyre & shell)- t q"it"..it of higher section of tyre to control ovality- higher specrfic refraclory brick loading r r L -^^-- --.,-- r^r rrr.- thicker and unerven coatings & build uf requiring high motor power for drhe'


7/11

SEVENTH NCB INTERNANONAL SEi"'VAR ON CEMENT AND BII//LDING MATER'ALS II.5IImprolement in kiln oomponent design eg. splined F"res, 2 support kilns. self aligining bearings.

direct drir-es through support roller station etc. are the aspects that require serious'attention for better capaciS'utilization.iii) Large plants employ s'ide cooler of above 4.8 m rvidth. The-v are difftcult to operate at high level ofrccuperation due to t'ariation in granulometry. liquid phase and distribution. This can. in the long run.

lead to higher maintenance cost. lower recuperation and larger pon'er consumption.8 INVESTI{ENT SCENARIO

Based on published data by various agencies it is revealed that investment cost per ton of annualinsralled capacitv is uidely varying. lnspite of the fact that large portion of equipment is manufacturedindigcnouslr. project cost in Thailand & Indonesia is in the range of US$ 120 -150 per ton. As against these.project cost in lndia has been as low as US$ 80 -100 per ton. Our anallsis shorv cost of equipment in thesecountrics is hrgher. Hence the perception that investment reduces as size ofsingle clinkering line increases. is notsrftstantiated bv published information. Very large size plants hal'e left the operating companies in huge foreignloan shich are diffrcult to senice. In India. eren norv. it nill be possible to build 2 million t/a single line in US$E-5-9() per ton rvithout pos'er plant.9 POTENTTAL OF EXISTING PII\NT

Several operating plants are now looking to the possibility of exploiting .the potential of existingplants. In last 5-7 I'ears, considerable experience has been gained in this area and capacity increase upto 20-30o/t)has been possible from existing clinkering lines by uay of:- inslalhtion of stateof-the-art d1'namic cage rotor separator in lertical roller mills for raw & coal

grinding.- retrofrt of prehater & precalciner S'stem- cnlargement of inlet section of the kiln- Installation ofstatic grate at inlet ofcooler u'ith beam areated plates in recuperation zone. and- installation ofhigh pressure roll press as pregrinder in clinker grinding plant.A bricf account of some ol the upratings done in India is gir.en in rablc - 7.

Bascd cn cxperiencc rre gained in such uprating c{fort. it is pro.jcctcd that the additional invesLnrcntinrolrcd in this uill be US $ 3(t-.10 per ton of annual capaciS'.IO CI,AIRVOYANCE

A strttplc


8/11

|

TALE.g9!B (Plan!:!s001t/dev nnd nbove)Countn Indo P.T.Scmen P.T.Semen P.T.Semen P.T.Semen P.T.lndoD'f Canan flmilr P-T.Scmen T.Semenrtaul --T -..__lrTuban-l I Trbat{ Tubrn-Itr Tones&-W Nusrntara CDtoolg_ Cibinong _!e!ev!-fhlglodccq. 9emen!:__T_- Narugong cilrceD-u lvlSrOS I r ul|tsl;sr

FLSrrnnlior / f)ecipn _+ FLS FLS FLS FLS FI.JLLER FI.JLLER FIJLLER FLS FLSClikerins caoacitv rDd 7500 7500 7800 7500 7800 7E00 I 7E00 _JRa* mill tnh s70 510 570 2x330 600 700 700 500 it-usrfizT--_l )/u !.-- --------_tM{u I ot,-Ewirs-M 59.42 LM 59.42 LM59.42 LM4l.4 LM59.42 LNI59,42 Llotr59.42Rlendins silo t 2x20000 2x20000 2x20000 2x20000 2x20000 2x20000 2x20000 -t ZXJ+UUU

----+x80 i --r1 5.5 x 87,li lno 5.6 x 84 5.6 x 84 5.6 x E4 5.5 x 87 5.6 x 84 5.6 x 84 5.6 x 8.1r,tD l5 l5 l5 l5.E l5 l5 t5 l6_P.qLq41!g:_&_lte93l,:ltq.olstages__:Ng.-g|$rtttg!---

4 4 4 4 52 2 2 2 2

16102 cFG 16102 cFG 1490 CFG CFG(itqlc 16102 cFG 16102 CFC 16132 with 16102 cFCCFGFI.JLLER FI.JLLER FULLER FULLER FI,JLLER FI,JLLER FI.JLLER FI.JLLER FULLER

- Area / Size sq.q l7l.l sa.mrph 55 55 55 52 50 50 50 45 50VRM VRM IVRM LM26.3 LM-26.30 LM-26.30 LM-26.30 LM-26.30 FLS-32/lE

mill tph 2x215 2x215 550 2x20O 2x2l0 2x210 550 2x22O 1x210mdiaxm 4.8 xl3 4.8 xl3 4.E xl3 5x17.5 4.t x13 4.8 xl3 5x15 4.7 x L4f,titl ball mill-2 ball mi[-2 bdl miU-2 ball nill-2 ball mill-2 ball nill-2 ball mi[-2 ball mill ball mill ball nill| - Separator1---I -Press/ VRM

N-5000 & N-5000 & N-5000 & N-3200 N-5000 & N-500060.3E HRC 60.38 HRC 60.3E HRC 60.38 HRC LI\1P30.40 uvP30.40 2.08 HRP uvP30.40

- Siz 2 nos. 2 noe. 2 nos. 2 noa. (VRM-LJBE) (\/RM.I.JBE) (\/RM-I.JBE)-Mrkc 2m0ktt 2000kw 2000 kw 2nos, 2nos. 2nos.

Ft\)omf;zI=@2;iTIioFq$3Tozc)ln==D=Dso=-ilIo


9/11

TABLE - {l( ounlr.r Thailand (Plants - 5500 Udav & aboyeI'lant Siam C ment Public Limlted Shm Arlr Cement TPI Polene PublicKaengKhoi Lampang Thung Song Thttng SonglKhro W Lhcl Line-2 Llne-l LtE-3Supplicr I.'I,S , K}II) KT{D KTID UBE FLS FLS FLS KP KP KP

hkcnng capaclt\' rN 5500 5t00 5500 7500 I 10000 2xl00O0 5500 7500 7500 7500 8500TIi-aw mill rph 2x220 440 440 60t) 2x4U) 4x400 2x240 2x350 2x280 2x280 2x280LM 3E.40 LM 50.4 LM 50.4 LM 53.4 : LM 50.42 LM 50.4 LM 38.440 LM 48.4 VRM VRM VRM

srlo 1x25000 I 1x25000 1x25000 1x25000 r 2x25000 1x30000 1x40000k-iln m diaxm lng. 5xE0 : 52x61 5.2 x 6l 5.6x82 | exlo5 6x96 5 xtO 5.5 x E7Ln) 16 ll7 I 1.7 t4.6 17.5 l6 t6 15.8'rc-heatcr 5stg. , 5stg, 5 stg ) slg. , 5stg 5 stage 5 stg 4/5 6 6& 2-strng 2-stnng 2 3 strings 3 strings

Prccalcrncrtxrler 3stq.(;C' , 3sts..GC' 3 stc,.GC 3stc,.Gc I 4stc.Gc 4 stace GC GC 3 stq.GG 3 stac.e 3 straceCPAG.I2 CPAG-l2l IKN CPAG CPAG Fuller CPAG1644 4830 4830

4x1644 3tt/m^2/dav 38t/m^2/dav KP KP(195m^21ral mill tph I x35+l x22 45-VRM 35 - VRM 5o-vRM 3x30 4x45 2 x28 2x40

A1'OX L.M 28.3 LM 23.2 LM 28.3 LM25.2 ATOX LM 21.20 LM 26.3027.5

cnrcnt mill tnh I \ 185 3 xl50 2xl2O 2x26O 1x220 3x300 2x t70 2x270 2x24Q 3x240 2 x 218Sizc m dra xrn .l6r l-l 5 r I4.5 .1.6 x 13.5 5 x 14.5 4.8x l4 2x2E0 4.4 x 13 5x12ballmill ball mill & ball mill-2 ball mill-2 ball mill-3 ball mill-5 ball mill-2 ball mill-2 ball mil l-2 ball mill-3 ball mill-2

Sepax & SKS 2IO sKs 210 SKS& Osepa& & & & &RP seDarator separator R.P I-IRC RP HRC KP 850/20 R.P. R.P.3 nos 2 nos 2650 kwI.VRM

orTfi=Iaoo=ilT=ToIanm.=o=sED=oSoo-DilIi(t


10/11

IL51 SEVENTH NCB //NnERNANONAL SET''YAR ON CENENT AND BUII-DING NATER'ALSTABLE.S

Cuntry Indir (Ptrntr - 55{n Udey end rbove)Plant Flnem[6i1 Prirm L&TAndhrr SengDi L&T GuirnlSrmlir/D6irn Fullcr FLS FLS Fuller FLM.&,Tqinecdng C@itv bd 5000 / 6500 6600 6500 750/J 6000 "RnYMill bh 450 2x275 2x275LM 46.4 ATOX42.5 ATOX 50 t'Jt''59.42 ATOX45Kiln mdia x 6Inc- 4.75x75 4.75{75 4.75x75 5.6x&{ 4.75x75Pre.Hcr& 5 shs 6 $asc 6 stacc 5 stase 5 stasEPrccahiu 2 sEitrr 2 strinr 2 stinr 2 slring 2 stdncCoolcr Coolax 14102 Coolu 14102 cFG 16102l4lm2 l4l m2 152m2C@lMill tph 40 50 50 I 50LM26.3 kTctx27.5 xroxz?.5 TNT26.3 ATOX27.sCelndMilt bh 6xt0 2x16o 2x160 2 NG. Tbbc millsTbbenilt Tubo mill Tubc nill

3.8 x 12.5 4.2 x ll 4.2 x llatvaios 2 NosRollcr 2 Nos Rollcr 2 NcRollerlocaions hesr Prss PrsgTABLE-6

PERTONilTANC-I CIARACTER$ITICS Or CLN{KENtrIG L[{ES WITE KILN SI'ZESKiln dianrcter m 3.8 4.4 4.7: 5.2: 5.5 5.75 6Capacity (Kiln LrD =ll) tDd 215( 270(; 3650 465( 550( ffi 7330 850( 9750CapacitvGilnL1D =15) bd 290( 360C 497A 63ft 7500 E75( 10000 l160( l33mRadiation loss(kilnI./t) = ll) kcaUke 5i 5l 45 4l 39 3i 35 3 3lRadiation loss(kilnt /D =I5) kcal,ftg 5( 5C 14 4C 38 35 34 32 3CFuel consumption(kiln IJD = ll) kcalftg 72E 721 7t4 709 7U 7U 702 699 69nuel censunpionftiln UD =15) kcaVke 721 720 7t2 70E 70: 702 701 69E 69(Power oonsumption for P.l[ fan kWVt 7.05 6.9{ 6.9t 6.8t 6.E6 6.EJ 6.83 6.81


11/11

SEVENTHA'CA "VTER'{A T'ONALSEM''VARON CEMENT AND BIJILDING MATERIALS II-55

TABLE. TPLANT UPRATEID BY RETROFITS

Companl Kiln Size Capacity (tPd) Maior Retrofits(ndiarml&) Original Uprated3.8 x 50 t500 2.100 2nd string of Preheater.rpgradation ofcooler.

rollpress in raw mill.Znd string of Preheater.Vikram - I ?Rr5o 1500 2+002 Step grate for cooler

t500 2,100 2nd string of preheater.Vikram'Il 3.E x lU Steo grate for cooler2400 3600 Modification in P.H.c1 clon-{ Shree Cement - l lrecalciner & fan : step glatein cooler :0'namic seP.for

Atox mills (R.M.&CLM)5000 6000l L&T Piparar'- I -t.75 x 755500 6(X)06 lL&T Piparar' - II .1.'r5 r 75

4000 Enlargement of inlet sgctlg!?II--f-_J IIuiirat Ambuia - I -t.0 x 60 2600 of kiln. New P.H.-Precalciner &

retrofit of cooler I R.M. / C.M.New Cement Mill

2800 4000 do-8 lGujarat Ambuja - ll .1.0 x 606500 Retrofit ofcooler.9 Himachal Ambuja* ,1.75 x 75 5500

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Technical Paper on Tunnel View - Clinkering Line Capacity.pdf