coal combustion process

7/24/2019 Coal Combustion Process

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Saad Asif12-ce-

103


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COMBUSTION OF COAL


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IMPORTANCE OF COAL COMBU

Coal is an important energy source or man!in"#

No$a"ays% "irect coal com&ustion is e'tensi(ely utili)e" or in"omestic purposes &ecause o t*e large+scale reser(es an" lo$coal#

It is use" to pro"uce electricity#

A&out ,-#. / o t*e $orl"0s electricity is pro"uce &y t*e coal# Most o t*e $orl"0s coal is &urne" in &oilers o po$er plants% in

&oilers% an" *eat !ilns 1to pro"uce cement% &ric!s% etc#2#

Space *eating an" "omestic consumption also consume a largo coal e(ery year#


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BASIC PROCESSES OFCOMBU

T*e com&ustion o coal is primarily t*e com&ustion o car&on at*e (olatile matter#

Principal com&ustion process o coal in(ol(es t*ree &asic stage

-# T*e release o t*e (olatile matter resulting rom t*e *eating

4# T*e &urning o t*e release" (olatile matter#

5# T*e &urning o t*e remaining c*ar#


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MAIN PROCESSES IN COALCOMBUSTION

coal particlep-coal, d=30-70m

devolatilization

volatiles

char

homogeneous

combustion

heterogeneous

combustion

CO2, H

CO2, H

tchar

=-2sectvolatiles

=!0-00mstdevolatile

=-!ms

t


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COMBUSTION SYSTEMS FOR SOLI

For complete com&ustion coal is &urne" $it* e'cess air#

T*e e'cess air re6uire" or coal com&ustion "epen"s on t*e ty7ring e6uipment#

I# Fi'e"+&e" com&ustion

II# Suspension Firing8Pul(eri)e" Coal com&ustion

III# Flui"i)e"+&e" com&ustion


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FIXED-BED COMBUS

In it lumps o coal is supporte" onto a grate% an" pre*eatprimary air 1calle" un"er7re air2 is &lo$n rom un"er t*e &urn t*e 7'e" car&on#

Some secon"ary air 1o(er7re air2 is intro"uce" o(er t*e c&urn t*e (olatiles release" rom t*e &e"#

Base" on t*e met*o" o ee"ing t*e coal% t*ese systems

urt*er classi7e" as 3I# O(eree" sto!ers

II# Un"eree" Sto!ers

III# Cross ee" sto!ers

.Sto!er 7re" &oilers use si)e" coal an" *ence re6uire less


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"to#er $ire


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PUL:ERISE; COALCOMBUSTION

Pul(erise" system is generally use" no$ a "ays or&ig po$er plant $*ose capacity e'cee"s -


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FLUI;I?E;+BE; COMBU

T*e &asic principle o operation is t*at t*e coal is mi'e" $it* amaterial 1e#g# san"2 an" t*e &e" is @ui"i)e" &y an up$ar"s

T*e &e" materialusually a mi'ture o coal%san"% an" limesto

san" particles is use" as *eating me"ium an" *eate" to t*e ig

temperature o coal#

In ui"i)e" &e" com&ustion t*e &e" temperature is maintaine"t*e melting point o t*e as* #

Temperature &elo$ as* m#p so ten"ency o slagging an" oulinre"uce


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TDPES OF FLUI;I?EBO

Concerning t*e structure o ui"i)e" &e"3

I# &oilers $it* !"i#$ ui"i)e" &e" 1BFB2

II# &oilers $it* ci%c!"a&i#$ ui"i)e" &e" 1CFB2


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coal combustion process

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