Coal Combustion Process
-
Upload
devilturn70 -
Category
Documents
-
view
232 -
download
0
Transcript of Coal Combustion Process
-
7/24/2019 Coal Combustion Process
1/16
-
7/24/2019 Coal Combustion Process
2/16
Saad Asif12-ce-
103
-
7/24/2019 Coal Combustion Process
3/16
COMBUSTION OF COAL
-
7/24/2019 Coal Combustion Process
4/16
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#
-
7/24/2019 Coal Combustion Process
5/16
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#
-
7/24/2019 Coal Combustion Process
6/16
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
-
7/24/2019 Coal Combustion Process
7/16
COMBUSTION SYSTEMS FOR SOLI
For complete com&ustion coal is &urne" $it* e'cess air#
T*e e'cess air re6uire" or coal com&ustion "epen"s on t*e ty7ring e6uipment#
I# Fi'e"+&e" com&ustion
II# Suspension Firing8Pul(eri)e" Coal com&ustion
III# Flui"i)e"+&e" com&ustion
-
7/24/2019 Coal Combustion Process
8/16
FIXED-BED COMBUS
In it lumps o coal is supporte" onto a grate% an" pre*eatprimary air 1calle" un"er7re air2 is &lo$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
-
7/24/2019 Coal Combustion Process
9/16
"to#er $ire
-
7/24/2019 Coal Combustion Process
10/16
PUL:ERISE; COALCOMBUSTION
Pul(erise" system is generally use" no$ a "ays or&ig po$er plant $*ose capacity e'cee"s -
-
7/24/2019 Coal Combustion Process
11/16
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
-
7/24/2019 Coal Combustion Process
12/16
-
7/24/2019 Coal Combustion Process
13/16
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
-
7/24/2019 Coal Combustion Process
14/16
-
7/24/2019 Coal Combustion Process
15/16
-
7/24/2019 Coal Combustion Process
16/16