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T3e !team dr/m is o ?e%ded constr/ction and p%aced on str/ct/reover t3e evaporator sections. T3e materia% o constr/ction is made o !A 16 r.70. Necessar@ no%es and connections or pipin andBttins are provided ?it3 s/pports. Hined man3o%es are provided in=ot3 3eads o t3e dr/m. T3e dr/m is provided ?it3 s/ita=%e t?o staeinterna%s to eGective%@ separate sat/rated steam and to maintain t3ere/ired steam p/rit@. 'inim/m dia. O steam dr/m s3a%% =e 1"72mm. T@pe o steam separator is ,emister.
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Necessar@ /e as d/ctin rom *H o/t%et to *H =oi%er and do?nstreamto an a%on ?it3 t3e dampers speciBed e%se?3ere in t3e contract. )n%etand o/t%et dampers o *H =oi%er s3a%% =e /i%%otine sea%ed motoriediso%ation dampers. ,amper provided in t3e =@pass d/ct 9*H do?ncomer: s3a%% =e motoried re/%atin 9'/%ti-Lo/ver: t@pe. *H =oi%ercasin and d/ctin t3icness or *H =oi%er s3a%% =e minim/m o 8 mm?it3 ade/ate stiGeners.
$or A4C /e as d/ct rom mid tap point to ,e-d/ster and /rt3er toA4C =oi%er to t3e eistin =a B%er a%on ?it3 dampers speciBede%se?3ere in t3e contract. )n%et and o/t%et dampers o A4C =oi%er s3a%%=e /i%%otine sea%ed motoried iso%ation dampers. ,amper provided int3e coo%er e3a/st s3a%% =e motoried re/%atin 9'/%ti-Lo/vrer: [email protected] No res3 air damper s3a%% =e provided in t3e air =%eed %ine tore/%ate t3e 3ot air temperat/re. ,/ctin t3icness or A4C =oi%er s3a%%=e minim/m 6 mm ?it3 ade/ate stiGeners.
Considerin t3e temperat/re o /e as( air vent t3e A4C =oi%er and
*H =oi%er are enc%osed ?it3 car=on stee% casin 9o speciBed t3icness:?it3 o/tside ins/%ation. Necessar@ access doors or ease o operationand maintenance s3a%% =e considered.
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*H =oi%er Evaporator section is o 3orionta% in%ine t/=es and cross-o?arranement ?it3 3eaders considerin 3i3 d/st content in t3e /eas. T3is desin eat/re to =e considered s3a%% tae into acco/ntminim/m acc/m/%ation o d/st on 3eatin s/race.
3eater o varia=%e m/%ti no%e oriBce ?it3 eterna% contro% va%ve t@peto =e provided in =et?een t3e s/per 3eaters to contro% t3e Bna% steamtemperat/re. T3e de-s/per3eatin s@stem s3a%% =e provided ?it3 a%%re/ired iso%atin va%ves pipin ins/%ation s/pports re/%atinva%ves etc. !/pp%ier s3a%% /rnis3 detai%ed *) diaram ?it3 %ine siesand instr/ments. T3e spra@ ?ater s3a%% =e tapped oG rom t3e eed %ineat a point /pstream o t3e eed contro% station. *H 5oi%er !/per3eateris o !in%e stae on%@.
2.6 Econo87$e
T3e economier is considered as t3e 3eat recover@ /nit or raisin t3eeed ?ater temperat/re =eore enterin t3e steam dr/m o respective=oi%ers. T3e economier s3a%% =e Horionta% or A4C =oi%er and *H=oi%er.
Condensate pre-3eater 9C*H: s3a%% =e considered as t3e additiona% 3eatrecover@ /nit to raise t3e condensate temperat/re =eore enterin intode-aerator to red/ce t3e steam cons/mption in de-aerator.
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E3a/st as rom *re-3eater =ein at 3i3er e%evation t3e as d/ctinto *H =oi%er ?i%% 3ave a top entr@. Hot air rom C%iner Coo%er =ein at%o?er e%evation t3e air d/ctin to A4C =oi%er ?i%% =e provided ?it3=ottom entr@ in pre d/st co%%ector. *rior to A4C =oi%er entr@ pre d/stco%%ector s3a%% =e provided to red/ce t3e d/st concentration =eoreenterin into t3e =oi%ers. T3e e3a/st rom respective so/rces s3a%%o?s t3ro/3 t3e vario/s 3eat transer sections o eac3 =oi%er. T3iss3a%% =e /rt3er connected to t3e eistin do?nstream e/ipments.,amper ?it3 epansion >oints as speciBed e%se?3ere in t3e contract
s3a%% =e provided or iso%atin t3e =oi%er d/rin emerenc@ conditions. T3e dampers to =e considered s3a%% =e ;;.;I sea%in dampers.
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T3e d/st acc/m/%ated on t3e 3eat transer s/race o *H =oi%er s3a%% =eremoved and dropped into t3e =ottom 3oppers =@ rappin mec3anism.Hammers mo/nted on a rotatin s3at drop 9=@ ravit@: and strie anvi%s9so%id s3at: t3at are attac3ed to t3e press/re part inside t3e =oi%ercasin. Rappin intensit@ s3a%% =e contro%%ed =@ t3e ?ei3t o 3ammersand t3e %ent3 o 3ammer mo/ntin arm. T3e re/enc@ is c3aned =@
ad>/stin t3e speed o t3e s3at. T3e desin o t3e d/st disposa% s@stems3a%% =e proven.
T3e co%%ected d/st in t3e 3oppers =e%o? t3e *H =oi%er and ot3er d/st
co%%ection points in t3e s@stem s3a%% =e transported t3ro/3 t3e mass
o? t@pe conve@or to t3e eistin d/st conve@in s@stem o t3e cement
a=rasion tendenc@ o t3e 3eatin s/races and a%so to co%%ect d/st. )n
addition to t3e a=ove =ottom entr@( vertica% o? o Hot air in to t3e
=oi%er so t3at an@ partia% rains t3at ot carried a?a@ a%so sett%es at t3e
=ottom 3opper o t3e DHR5 d/e to ravit@. T3e co%%ected d/st in t3e
3oppers =e%o? t3e A4C =oi%ers and ot3er d/st co%%ection points in t3es@stem s3a%% =e transported t3ro/3 t3e mass o? t@pe conve@or to t3e
eistin d/st conve@in s@stem o t3e cement p%ant. Eac3 d/st
co%%ectin 3oppers s3a%% =e provided ?it3 p%ate ate Rotar@ air %oc
va%ve. T3ese rotar@ air %oc s3a%% disc3are t3e d/st to t3e mass o?
t@pe conve@or =e%o? t3e /%% %ent3 o t3e =oi%ers.
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*H 5oi%er
$%/e as tappin s3a%% =e taen at a 3i3er e%evation o t3e eistin *Heit /e as d/ct so as to matc3 ?it3 t3e as entr@ point o t3e DHR5. T3e eit o t3e DHR5 is aain to =e connected to t3e *H ans in%et d/ctat a %o?er e%evation.
T3e t@pe o dampers and t3eir positionin s3a%% =e c%ear%@ speciBedconsiderin no d/st acc/m/%ation on t3e dampers.
A4C 5oi%er
T3e air a=ove t3e in%et section o t3e C%iner coo%er ater miin ?it3t3e am=ient air rom t3e coo%er an ?i%% =e at a ver@ 3i3 temperat/re. T3e 3ot air mit/re tapped a=ove t3e coo%er rate in t3is section ?i%%t3en =e rec@c%ed as secondar@ and tertiar@ air to t3e i%n or c%inerprod/ction. T3e section ater t3e secondar@ and tertiar@ air tappin ist3e %ocation identiBed or tappin t3e 3ot air re/ired or 3eat recover@.
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One no. =%o? do?n tan to =e considered or eac3 to ?3ic3 t3e =oi%er5%o? do?n =oi%er drain %ines rom vario/s s@stem ?i%% =e connected.
$eed ?ater enters t3e common condensate pre-3eater de-aeratorrom de-aerator o/t%et to economier rom 5$*( eed contro% stationrom economier o/t%et it is ed to t3e !team dr/m. $rom t3e dr/m t3e?ater enters to t3e evaporator in%et 3eader. Ater a=sor=in 3eat romt3e 3eat so/rces steam-?ater mit/re ormed and moved to t3erespective steam dr/m t3ro/3 nat/ra% circ/%ation. !eparatedsat/rated steam rom steam dr/m s3a%% =e 3eated in respective s/per-3eater.
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*ress/ried de-aerator s3a%% =e provided =@ t3e s/pp%ier a%on ?it3 L*dosin s@stem. T3e %ocation o de-aerator a%on ?it3 5$* s3a%% =eprovided in t3e T 3a%% .T3is s@stem s3a%% consists o ,e-aerator in?3ic3 t3e o@en content in t3e eed ?ater is red/ced to t3e re/ired
%eve% =@ spra@in ?ater as drop%ets in t3e presence o steam. !toraetan =e%o? t3e ,e-aerator to store de-aerated ?ater.
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!ince eed ?ater contains traces o o@en d/e to t3e incomp%etemec3anica% ( t3erma% deaeration. Traces o o@en s3a%% =e scavened=@ c3emica% deaeration. C3emica%s %ie sodi/m s/%p3ite or 3@draines3a%% =e dosed in t3e s/ction pipe o eed p/mp =@ L* dosin. L* dosin?it3 sodi/m s/%p3ite is to =e considered to reacts ?it3 o@en and toorm sodi/m s/%p3ate or in case o 3@draine it reacts ?it3 O2 andorms ?ater and nitroen.
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!ca%e ormation is %imited =@ convertin 3ardness sa%ts to a ree o?ins%/de. H* dosin is done =@ car=onate contro% and p3osp3ate contro%=@ addition o sodi/m car=onate or trisodi/m p3osp3ate respective%@.Ot3er c3emica%s s/c3 as sodi/m 3@droide car=onate or ca%ci/m
o@p3osp3ate can a%so =e added. 5est res/%t o ca%ci/m car=onate ormanesi/m 3@droide or ca%ci/m si%icate manesi/m si%icate ?i%% =eavai%a=%e as ree o?in s%/de ?3ere ca/stic a%a%init@ is 10 to 1I o t3e disso%ved so%ids. OH a%a%init@ %eads to prevention o manesi/mp3osp3ate as =ad sca%e =@ convertin manesi/m to manesi/m3@droide. T3e H* dosin s@stem s3a%% add t3e c3emica% to t3e =oi%er?ater to tae care o t3e inress o t3e 3ardness sa%t and to increaset3e =oi%er ?ater pH.