FBC Boiler Final

8/18/2019 FBC Boiler Final

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An Overview of

FBC BoilerCompiled

BY

S.S.ACHARYA

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INTRODUCTION

Boiler-

As per “THE INDIAN BOILERS(AMENDMENT )ACT!!"

#Boiler$ me%&s % press're essel i& *i+*s,e%m is -e&er%,ed or 'se e/,er&%l ,o i,sel 0 %ppli+%,io& o *e%, *i+* is *oll orp%r,l '&der press're *e& s,e%m is s*', o2


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BOILER COM3ONENTSBoiler +ompo&e&,$ me%&s

S,e%m pipi&- 4 5eed %,er pipi&-4

E+o&omi6er 4

S'per *e%,er4

%& mo'&,i&- or o,*er 7,,i&- %&d %& o,*ere/,er&%l or i&,er&%l p%r, o % Boiler *i+* iss'08e+,ed ,o press're e/+eedi&- o&e 9ilo-r%mper +e&,ime,er s:'%re -%'-e

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Single Line Diagram

BURNERWATER

SOURCE

CHEMICAL FEED

FUEL

STACK DEAERATOR

PUMPS

BOILER

ECO-

NOMI-

ZER

VENTEXHAUST GASSTEAM TOPROCESS

BURNERWATER

SOURCE

CHEMICAL FEED

FUEL

STACK DEAERATOR

PUMPS

BOILER

ECO-NOMI-ZER

VENTEXHAUST GASSTEAM TOPROCESS


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Fuels used in Boiler

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Types of Boilers1. Fire Tube Boiler

. Water Tube Boiler!. "a#$aged Boiler

%. Sto$er Fired Boiler

&. "ulveri'ed Fuel Boiler

(. Waste )eat Boiler

*. Fluidi'ed Bed +FBC, Boiler

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Fluidi'ed Bed +FBC,Boiler

I&,rod'+,io& o 5BC Te+*&olo-

Ad%&,%-es ? Limi,%,io&s

S+ope

5'el 5le/i0ili,

Cl%ssi7+%,io& o 5BC Boilers

Des+rip,io& o @%rio's Compo&e&,s o C5BCBoiler


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Fluidi'ed Bed +FBC, Boiler

A& Oerie

5l'idi6ed 0ed +om0's,io& *%s emer-ed %s % i%0le %l,er&%,ie

%&d *%s si-&i7+%&, Advantages oer +o&e&,io&%l 7ri&-

ss,em %&d o2ers m'l,iple 0e&e7,s

+omp%+, 0oiler desi-&4 'el e/i0ili,4

*i-*er +om0's,io& e+ie&+ %&d

red'+ed emissio& o &o/io's poll',%&,s s'+* %s SO/ %&d NO/.


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Fluidi'ed Bed +FBC, Boiler

Co&,dFF.

T*e 'els 0'r&, i& ,*ese 0oilers i&+l'de +o%l4%s*er

re8e+,s4 ri+e *'s94 0%-%sse ? o,*er %-ri+'l,'r%l%s,es.

T*e 'idi6ed 0ed 0oilers *%e % ide +%p%+i,r%&-e.

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Mechanism of Fluidized Bed Combustion

• When an evenly distributed air or gas is passed upward

through a finely divided bed of solid particles such as

Sand/Ash/Lime Stone supported on a fine mesh, the particles

are undisturbed at low velocity.

As air velocity is gradually increased, a stage is

reached when the individual particles are suspended in the air

stream G the bed is called “fluidized.

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Mechanism of Fluidized Bed Combustion

With further increase in air velocity, there is bubble

formation, vigorous turbulence, rapid mixing and

formation of dense defined bed surface. he bed of

solid particles exhibits the properties of a boiling li!uid

and assumes the appearance of a fluid " #$ubbling

%luidized $ed&.

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Mechanism of Fluidized Bed

Combustion…

A, *i-*er elo+i,ies4 0'00les dis%ppe%r4

%&d p%r,i+les %re 0lo& o', o ,*e 0ed. T*ereore4 some %mo'&,s o p%r,i+les *%e,o 0e re+ir+'l%,ed ,o m%i&,%i& % s,%0le

ss,em G “Cir+'l%,i&- 5l'idi6edBed.

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Basics of Fluidized Bed Combustion…

5l'idi6%,io& depe&ds l%r-el o& ,*e p%r,i+le si6e %&d,*e %ir elo+i,.

I s%&d p%r,i+les i& % 'idi6ed s,%,e is *e%,ed ,o ,*ei-&i,io& ,emper%,'res o +o%l4 %&d +o%l is i&8e+,ed+o&,i&'o'sl i&,o ,*e 0ed4 ,*e +o%l ill 0'r& r%pidl

%&d 0ed %,,%i&s % '&iorm ,emper%,'re.

T*e 'idi6ed 0ed +om0's,io& (5BC) ,%9es pl%+e %,%0o',

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Basics of Fluidized Bed Combustion…

• Since this temperature is much below the ash fusion

temperature, melting of ash and associated problems

are avoided.

• he lower combustion temperature is achieved because of

high coefficient of heat transfer due to rapid mixing in the

fluidized bed and effective extraction of heat from the bed

through in'bed heat transfer tubes and walls of the bed.

• he gas velocity is maintained between minimum fluidization

velocity and particle entrainment velocity. his ensures stable

operation of the bed and avoids particle entrainment in the gas

stream.

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Mechanism of Fluidised Bed Combustion…

• (ombustion process re!uires the three “s that is

a. ime, b. emperature and

c. urbulence.

)n %$(, turbulence is promoted by fluidization. )mproved

mixing generates evenly distributed heat at lower temperature.

*esidence time is many times greater

than conventional grate firing. hus an %$( system

releases heat more efficiently at lower temperatures

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Mechanism of Fluidized Bed Combustion…

• As ,*e elo+i, o % -%s oi&- ,*ro'-* % 0ed

o p%r,i+les i&+re%ses4 % %l'e is re%+*ed *e&,*e 0ed 'idi6es %&d 0'00les orm %s i& %0oili&- li:'id.

• A, *i-*er elo+i,ies ,*e 0'00les dis%ppe%r%&d ,*e solids %re r%pidl 0lo& o', o ,*e 0ed%&d m's, 0e re++led ,o m%i&,%i& % s,%0less,em.

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Mechanism of Fluidised Bed Combustion…

B mi/i&- o sm%ll :'%&,i, o limes,o&ei,* Bed m%,eri%l4 orm%,io& o s'l'rdio/ide is red'+ed.

Ni,ro-e& o/ide orm%,io& is %lso red'+ed i&,*e +om0's,io& +*%m0er d'e ,o loer

'r&%+e ,emper%,'re i,*o', %& %ddi,io&%l+o&,rol e:'ipme&,.

T*is is ,*e m%8or %d%&,%-es o 5BC oerCo&e&,io&%l 0oilers.

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Types of Fluidized Bed Combustion Boilers

here are three basic types of fluidized bed combustion

boilers+ . Atmospheric classic %luidized $ed (ombustion System

-A%$(

. 0ressurised %luidized $ed (ombustion System -0%$(.

1. (irculating %luidized $ed (ombustion system -(%$(

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AFBC / Bubbling Bed

I& A5BC4 +o%l is +r's*ed ,o % si6e o 1 G 1!mm depe&di&- o& ,*e r%&9 o +o%l4 ,pe o'el eed %&d ed i&,o ,*e +om0's,io&

+*%m0er. T*e %,mosp*eri+ %ir4 *i+* %+,s%s 0o,* ,*e 'idi6%,io& %ir %&d +om0's,io&%ir4 is deliered %, % press're *i+* os,*ro'-* ,*e 0ed %,er 0ei&- pre*e%,ed 0

,*e e/*%'s, 'e -%ses. T*e elo+i, o'idi6i&- %ir is i& ,*e r%&-e o 1. ,o ;."m Jse+. T*e r%,e %, *i+* %ir is 0lo&,*ro'-* ,*e 0ed de,ermi&es ,*e %mo'&, o

'el ,*%, +%& 0e re%+,ed !


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AFBC / Bubbling Bed……..Almost all AFBC bubbling bed boilers

use in-bed evaporator tubes in te

bed of limestone/ sand and fuel fore0tra#ting te eat from te bed tomaintain te bed temperature.

T*e 0ed dep,* is 's'%ll !. m ,o 1.= m

deep %&d ,*e press're drop %er%-es%0o', 1 i&+* o %,er per i&+* o 0eddep,*. @er li,,le m%,eri%l le%es ,*e0'00li&- 0ed G o&l %0o', ,o < 9- o

solids %re re++led per ,o& o 'el 0'r&ed 1


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$ubbling $ed $oilers

I& ,*e 0'00li&- 0ed ,pe 0oiler4 % l%er osolid p%r,i+les (mostly limestone/ sand/

as and #al#ium sulfate) is +o&,%i&ed o&% -rid &e%r ,*e 0o,,om o ,*e 0oiler. T*isl%er is m%i&,%i&ed i& % ,'r0'le&, s,%,e %slo elo+i, %ir is or+ed i&,o ,*e 0ed rom

% ple&'m +*%m0er 0e&e%,* ,*e -rid. 5'elis %dded ,o ,*is 0ed %&d +om0's,io& ,%9espl%+e.


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$ubbling $ed $oilers

Norm%ll4 r% 'el i& ,*e 0ed does &o, e/+eed K

o ,*e ,o,%l 0ed i&e&,or. @elo+i, o ,*e

+om0's,io& %ir is 9ep, %, % mi&im'm4 e, *i-*

e&o'-* ,o m%i&,%i& ,'r0'le&+e i& ,*e 0ed.

@elo+i, is &o, *i-* e&o'-* ,o +%rr si-&i7+%&,

:'%&,i,ies o solid p%r,i+les o', o ,*e 'r&%+e

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$ubbling $ed $oilers222

T*is ,'r0'le&, mi/i&- o %ir %&d 'el res'l,s

i& % reside&+e ,ime o 'p ,o 7e (=) se+o&ds. T*e +om0i&%,io& o ,'r0'le&, mi/i&- %&dreside&+e ,ime permi,s 0'00li&- 0ed 0oilers,o oper%,e %, % 'r&%+e ,emper%,'re 0elo

!! de-ree C.A, ,*is ,emper%,'re4 ,*e prese&+e o

limes,o&e mi/ed i,* 'el i& ,*e 'r&%+e%+*iees -re%,er ,*%& !K s'l'r remo%l.

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I&+omple,e +om0's,io& res'l,s i& ,*e

orm%,io& o +%r0o& mo&o/ide (CO) pl's'&0'r&e, +%r0o& i& ,*e solid p%r,i+les le%i&-,*e 'r&%+e.

Boiler e+ie&+ is ,*e per+e&,%-e o ,o,%l

e&er- i& ,*e 'el ,*%, is 'sed ,o prod'+es,e%m.

Com0's,io& e+ie&+ is ,*e per+e&,%-e o+omple,e +om0's,io& o +%r0o& i& ,*e 'el.

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I& % ,pi+%l 0'00li&- 0ed 'idi6ed 0oiler4

#ombustion e#ien#y #an be as ig as23. Tis is a good 4gure/ but is lower tantat a#ieved by pulveri'ed #oal or #y#lone-4red boilers.

I& %ddi,io&4 some 'els ,*%, %re very low involatile matter #annot be #ompletely burnedwitin te available residen#e time inbubbling bed-type boilers.

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Features of bubbling bed boiler

5l'idi6ed 0ed 0oiler +%& oper%,e %, &e%r %,mosp*eri+ orele%,ed press're %&d *%e ,*ese esse&,i%l e%,'res

Dis,ri0',io& pl%,e ,*ro'-* *i+* %ir is 0lo& or 'idi6i&-.

Immersed s,e%mr%isi&- or %,er *e%,i&- ,'0es *i+*

e/,r%+, *e%, dire+,l rom ,*e 0ed.

T'0es %0oe ,*e 0ed e/,r%+, *e%, rom *o,

+om0's,io& -%s 0eore i, e&,ers ,*e 'e d'+,.

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(irculating %luidized $ed (ombustion

-(%$(• T*e &eed ,o improe +om0's,io& e+ie&+

(*i+* %lso i&+re%ses oer%ll 0oilere+ie&+ %&d red'+es oper%,i&- +os,s)%&d te desire to burn a mu# widerrange of fuels as led to tedevelopment and appli#ation of te

CFB boiler.• T*ro'-* ,*e e%rs4 0oiler s'ppliers *%e

0ee& i&+re%si&- ,*e si6e o ,*ese *i-*e+ie&+ s,e%m -e&er%,ors.


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-(%$(

A CFBC #ould be good #oi#e if tefollowing #onditions are met.

1. C%p%+i, o 0oiler is l%r-e ,o medi'm

. S'lp*'r emissio& %&d NO/ +o&,rol is

impor,%&,;.T*e 0oiler is re:'ired ,o 7re lo-r%de 'el or

'el i,* *i-*l '+,'%,i&- 'el :'%li,.


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-(%$(222C5BC ,e+*&olo- ',ili6es ,*e 'idi6ed 0ed

pri&+iple i& *i+* +r's*ed (> G1 mm si6e)'el %&d limes,o&e %re i&8e+,ed i&,o ,*e'r&%+e or +om0's,or. T*e p%r,i+les %res'spe&ded i& % s,re%m o 'p%rdl oi&-%ir (>!"!K o ,*e ,o,%l %ir)4 *i+* e&,ers

,*e 0o,,om o ,*e 'r&%+e ,*ro'-* %irdis,ri0',io& &o66les. T*e 'idi6i&- elo+i,i& +ir+'l%,i&- 0eds r%&-es rom ;." ,o mJse+. T*e 0%l%&+e o +om0's,io& %ir is

%dmi,,ed %0oe ,*e 0o,,om o ,*e 'r&%+e ;!


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-(%$(222

T*e +om0's,io& ,%9es pl%+e %,

mi+ro&s) %re el',ri%,ed o', o ,*e'r&%+e i,* 'e -%s elo+i, o mJs. T*e p%r,i+les %re ,*e& +olle+,ed 0

,*e solids sep%r%,ors %&d +ir+'l%,ed0%+9 i&,o ,*e 'r&%+e. Solid re++le is%0o', =! ,o 1!! -m per 9- o 'el 0'r&,.

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-(%$(222

I& C5BC 0oiler4 s,e%m -e&er%,io& ,'0es%re &o, proided i& ,*e 0ed. T*e

'idi6%,io& o 0ed is desi-&ed ,o moem%/. solids o', o ,*e 'r&%+e %re% %&d ,o%+*iee mos, o ,*e *e%, ,r%&ser o',side

,*e +om0's,io& 6o&e +o&e+,io& se+,io&4%,er %lls4 %&d %, ,*e e/i, o ,*e riser.Some +ir+'l%,i&- 0ed '&i,s ee& *%ee/,er&%l *e%, e/+*%&-es.

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System-(%$(222

T*e p%r,i+les +ir+'l%,io& proides

e+ie&, *e%, ,r%&ser ,o ,*e 'r&%+e%lls %&d lo&-er reside&+e ,ime or+%r0o& %&d limes,o&e ',ili6%,io&.

T*e +o&,rolli&- p%r%me,ers i& ,*e C5B+om0's,io& pro+ess %re ;Ts o&l i.e.,emper%,'re4 reside&+e ,ime %&d,'r0'le&+e.

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-(%$(222

• 5or l%r-e '&i,s4 ,*e ,%ller 'r&%+e

+*%r%+,eris,i+s o C5BC 0oiler o2ers 0e,,ersp%+e ',ili6%,io&4 -re%,er 'el p%r,i+le %&dsor0e&, reside&+e ,ime or e+ie&,+om0's,io& %&d SO +%p,'re4 %&d e%sier

%ppli+%,io& o s,%-ed +om0's,io&,e+*&i:'es or NO/ +o&,rol ,*%& A5BC-e&er%,ors.

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-(%$(222

C5BC 0oilers %+*iee 0e,,er +%l+i'm ,o s'lp*'r',ili6%,io& (G 1.= ,o 1 ) s. (;. ,o 1) or ,*e A5BC

0oilers4 %l,*o'-* ,*e 'r&%+e ,emper%,'res %re %lmos,,*e s%me.

C5BC 0oilers %re -e&er%ll +l%imed ,o 0e moree+o&omi+%l ,*%& A5BC 0oilers or i&d's,ri%l%ppli+%,io& re:'iri&- more ,*%& "= G 1!! TJ*r os,e%m

C5BC re:'ires *'-e me+*%&i+%l ++lo&es ,o +%p,'re%&d re++le ,*e l%r-e %mo'&, o 0ed m%,eri%l4 *i+*re:'ires % ,%ll 0oiler.

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-(%$(222

;>


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(irculating %luidized $ed (ombustion $oiler

-(%$(222

;"


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Advantages of Fluidized Bed Combustion Boilers

)ig 5#ien#y

5BC 0oilers +%& 0'r& 'el i,* % +om0's,io& e+ie&+ ooer =K irrespe+,ie o %s* +o&,e&,. 5BC 0oilers +%&oper%,e i,* oer%ll e+ie&+ o


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Advantages of Fluidized Bed Combustion

BoilersFuel Fle0ibility

5BC 0oilers +%& 0e oper%,ed e+ie&,l i,* % %rie, o 'els. Ee&'els li9e o,%,io& slimes4 %s*er re8e+,s4 %-ro %s,e +%& 0e 0'r&,

e+ie&,l. T*ese +%& 0e ed ei,*er i&depe&de&,l or i& +om0i&%,io&i,* +o%l i&,o ,*e s%me 'r&%+e.

Ability to Burn 7ow 8rade Fuel

5BC 0oilers o'ld -ie ,*e r%,ed o',p', ee& i,* i&erior :'%li,'el. T*e 0oilers +%& 7re +o%ls i,* %s* +o&,e&, %s *i-* %s >K %&d*%i&- +%lori7+ %l'e %s lo %s 4=!! 9+%lJ9-. Ee& +%r0o& +o&,e&, oo&l 1K 0 ei-*, +%& s's,%i& ,*e 'idi6ed 0ed +om0's,io&.


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Advantages of Fluidised Bed Combustion

Boilers………

Ability to Burn Fines

Co%l +o&,%i&i&- 7&es 0elo > mm +%& 0e 0'r&, e+ie&,l i&5BC 0oiler4 *i+* is er di+'l, ,o %+*iee i& +o&e&,io&%l7ri&- ss,em.

"ollution Control

SO orm%,io& +%& 0e -re%,l mi&imised 0 %ddi,io& olimes,o&e or dolomi,e or *i-* s'lp*'r +o%ls. ;K limes,o&e isre:'ired or eer 1K s'lp*'r i& ,*e +o%l eed. Lo+om0's,io& ,emper%,'re elimi&%,es NO/ orm%,io&


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Boilers……….

7ow Corrosion and 5rosion

T*e +orrosio& %&d erosio& e2e+,s %re less d'e ,o loer+om0's,io& ,emper%,'re4 so,&ess o %s* %&d lo p%r,i+le elo+i,(o ,*e order o 1 mJse+).

5asier As 6emoval 9 :o Clin$er Formation

Si&+e ,*e ,emper%,'re o ,*e 'r&%+e is i& ,*e r%&-e o "=! G!!o C i& 5BC 0oilers4 ee& +o%l o lo %s* 'sio& ,emper%,'re +%&0e 0'r&, i,*o', +li&9er orm%,io&. As* remo%l is e%sier %s ,*e%s* os li9e li:'id rom ,*e +om0's,io& +*%m0er. He&+e lessm%&poer is re:'ired or %s* *%&dli&-.


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Boilers……….7ess 50#ess Air 9

Hi-*er CO i& 5l'e %s T*e CO i& ,*e 'e -%ses ill 0e o ,*e order o

1< G 1=K %, 'll lo%d. He&+e4 ,*e 5BC 0oiler +%& oper%,e %, lo e/+ess

%ir o&l ! G =K.

Simple Operation/ ;ui#$ Start-


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Boilers……….:o Slag Formation in te Furna#e-:o Soot Blowing

I& 5BC 0oilers4 ol%,ili6%,io& o %l9%li +ompo&e&,s i& %s* does &o,

,%9e pl%+e %&d ,*e %s* is &o& s,i+9. T*is me%&s ,*%, ,*ere is &osl%- orm%,io& *e&+e &o re:'ireme&, o soo, 0loi&-.

"rovisions of Automati# Coal and As )andling System

A',om%,i+ ss,ems or +o%l %&d %s* *%&dli&- +%& 0e i&+orpor%,ed4m%9i&- ,*e pl%&, e%s ,o oper%,e +omp%r%0le ,o oil or -%s 7redi&s,%ll%,io&.

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Advantages of Fluidized Bed Combustion

Boilers

"rovision of Automati# =gnition System

Co&,rol ss,ems 'si&- mi+ropro+essors %&d %',om%,i+ i-&i,io&

e:'ipme&, -ie e/+elle&, +o&,rol i,* mi&im'm m%&'%ls'perisio&

)ig 6eliability

T*e %0se&+e o moi&- p%r,s i& ,*e +om0's,io& 6o&e res'l,s i&

% *i-* de-ree o reli%0ili, %&d lo m%i&,e&%&+e +os,s.

6edu#ed >aintenan#e

Ro',i&e oer*%'ls %re i&re:'e&, %&d *i-* e+ie&+ ism%i&,%i&ed or lo&- periods.


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Boilers……….

;ui#$ 6esponses to Canging ?emand

A 'idi6ed 0ed +om0's,or +%& respo&d ,o +*%&-i&- *e%, dem%&dsmore e%sil ,*%& s,o9er 7red ss,ems. T*is m%9es i, er s'i,%0le or%ppli+%,io&s s'+* %s ,*erm%l 'id *e%,ers4 *i+* re:'ire r%pidrespo&ses.

)ig 5#ien#y of "ower 8eneration

B oper%,i&- ,*e 'idi6ed 0ed %, ele%,ed press're4 i, +%& 0e 'sed ,o-e&er%,e *o, press'ri6ed -%ses ,o poer % -%s ,'r0i&e. Tis #an be#ombined wit a #onventional steam turbine to improve tee#ien#y of ele#tri#ity generation and give a potential fuelsavings of at least %3.


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eneral Arrangements of FBC Boiler

5BC 0oilers +omprise o olloi&- ss,ems

i) 5'el eedi&- ss,em

ii) Air Dis,ri0',or

iii) Bed ? I&0ed *e%, ,r%&ser s'r%+e

i) As* *%&dli&- ss,em

M%& o ,*ese %re +ommo& ,o %ll ,pes o 5BC 0oilers

i, Fuel Feeding system

5or eedi&- 'el4 sor0e&,s li9e limes,o&e or dolomi,e4's'%ll ,o me,*ods %re olloed '&der 0ed p&e'm%,i+eedi&- %&d oer0ed eedi&-.


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eneral Arrangements of FBC Boiler


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eneral Arrangements of FBC Boiler…. . Air ?istributor

T*e p'rpose o ,*e dis,ri0',or is ,o i&,rod'+e ,*e 'idi6i&- %ir ee&l,*ro'-* ,*e 0ed +ross se+,io& ,*ere0 9eepi&- ,*e solid p%r,i+les i&

+o&s,%&, mo,io&4 %&d pree&,i&- ,*e orm%,io& o de'idi6%,io& 6o&esi,*i& ,*e 0ed. T*e dis,ri0',or4 *i+* orms ,*e 'r&%+e oor4 is &orm%ll+o&s,r'+,ed rom me,%l pl%,e i,* % &'m0er o peror%,io&s i& % de7&i,e-eome,ri+ p%,,er&. T*e peror%,io&s m% 0e lo+%,ed i& simple &o66les or

&o66les i,* 0'00le +%ps4 *i+* sere ,o pree&, solid p%r,i+les romoi&- 0%+9 i&,o ,*e sp%+e 0elo ,*e dis,ri0',or.

T*e dis,ri0',or pl%,e is pro,e+,ed rom *i-* ,emper%,'re o ,*e 'r&%+e 0

i) Rer%+,or Li&i&-

ii) A S,%,i+ L%er o ,*e Bed M%,eri%l or

iii) P%,er Cooled T'0es.


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eneral Arrangements of FBC Boiler……..

Bed @ =n-Bed )eat Transfer Surfa#e

a, Bed

T*e 0ed m%,eri%l +%& 0e s%&d4 %s*4 +r's*ed rer%+,or or limes,o&e4i,* %& %er%-e si6e o %0o', 1 mm. Depe&di&- o& ,*e 0ed *ei-*,,*ese %re o ,o ,pes s*%llo 0ed %&d deep 0ed.

A, ,*e s%me 'idi6i&- elo+i,4 ,*e ,o e&ds 'idi6e di2ere&,l4 ,*'s%2e+,i&- ,*e *e%, ,r%&ser ,o %& immersed *e%, ,r%&ser s'r%+es. As*%llo 0ed o2ers % loer 0ed resis,%&+e %&d *e&+e % loer press'redrop %&d loer %& poer +o&s'mp,io&. I& ,*e +%se o deep 0ed4 ,*epress're drop is more %&d ,*is i&+re%ses ,*e e2e+,ie -%s elo+i, %&d%lso ,*e %& poer.

=!


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eneral Arrangements of FBC Boiler….b, In-Bed Heat Transfer Surface

I& % 'idi6ed i&0ed *e%, ,r%&ser pro+ess4 i, is&e+ess%r ,o ,r%&ser *e%, 0e,ee& ,*e 0ed m%,eri%l%&d %& immersed s'r%+e4 *i+* +o'ld 0e ,*%, o % ,'0e0'&dle4 or % +oil. T*e *e%, e/+*%&-er orie&,%,io& +%&0e *ori6o&,%l4 er,i+%l or i&+li&ed. 5rom % press're drop

poi&, o ie4 % *ori6o&,%l 0'&dle i& % s*%llo 0ed ismore %,,r%+,ie ,*%& % er,i+%l 0'&dle i& % deep 0ed.

=1


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eneral Arrangements of FBC Boiler…..

T*e *e%, ,r%&ser i& ,*e 0ed depe&ds o& &'m0ero p%r%me,ers li9e

i) 0ed press're

ii) 0ed ,emper%,'re

iii) s'per7+i%l -%s elo+i,

i) p%r,i+le si6e

) He%, e/+*%&-er desi-& %&d

i) -%s dis,ri0',or pl%,e desi-&.

=


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eneral Arrangements of FBC Boiler….. %. As )andling System

a) Bottom ash removal

I& ,*e 5BC 0oilers4 ,*e 0o,,om %s* +o&s,i,',es

ro'-*l ;!

%oid %++'m'l%,io& %&d +o&se:'e&, de'idi6%,io&.P*ile 7ri&- *i-* %s* +o%l s'+* %s %s*er re8e+,s4,*e 0ed %s* oero dr%i& :'%&,i, is +o&sider%0leso spe+i%l +%re *%s ,o 0e ,%9e&.

=;


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FBC Boiler- O56 =5W

THANQS

Documents

FBC Boiler Final