Development of0.1MW- c las s Oxy- PC Swirl Burne r
with Primary O2 Dire c t- inje c tion
Kore a Ins titute of Ene rgy Re s e arc h
Dae Ke un Le e , Dong- Soon Noh, Kyong- Bin Choi,Dong Myung Se o, Chang- Bog Ko, Eun Kyung Le e
1s t Inte rnational Oxyfue l Combus tion Confe re nc eCottbus , Ge rmany
8th Se pte mbe r 2009
1st International Oxyfuel Combustion Conference
2/25
Conte nts
► Bac kground
► Obje c tive
► De s ign Conc e pts of Oxy- PC Burne r
► Expe rime ntal Re s ults
► Summary
1st International Oxyfuel Combustion Conference
3/25
Air- PC
Background
Oxy- PC
Retrof it ornew build
O2 : CO2 ~ 30 : 70
► FGR for T control Similar T f ie ld with Air- PC
le s s e n the load for boile r de s ign.
► Amount of re c yc le d gas O2 : FGR (CO2) ~ 30 : 70 Le s s volume of CO2 than
that of N2
Large r Cp of CO2 than N2
► The n, s imilar T f ie ld?
1st International Oxyfuel Combustion Conference
4/25
Obje c tive
► Matc hing c onditions of te mpe rature f ie lds ofAir- & Oxy- f ir ing
Te s t of Air - & Oxy- fir ing us ing s ingle burne r► Coaxia l nozzle type s wirl burne r► Mixing nozzle type s wirl burne r
Oxy- PC burne r de s ign parame te rs
Te s t of ne wly de s igne d Oxy- PC burne r
1st International Oxyfuel Combustion Conference
5/25
Te s t Fac ility
► Furnac e Cylindric al & horizontal 11 s ampling & me as uring ports Te rtiary oxidant inje c tion ports through s ide wall
3.2m
450mm
1st International Oxyfuel Combustion Conference
6/25
Coal
► Te s t c oal Aus tralian bituminous c oal Coal analys e s
1st International Oxyfuel Combustion Conference
7/25
Te s te d Burne rs
► Coaxial nozzle type s wir l burne r
► Mixing nozzle type s wir l burne r
► Multi- nozzle type s wir l burne r
1st International Oxyfuel Combustion Conference
8/25
Burne r De s ign 1
Burne r Nozzle type Air- f ir ing Oxy- fir ing
Coaxia lnozzleburne r Secondary
swirl nozzle
Coal nozzle
Coal +Primary air
Secondaryair
Coal +Primary O2 /CO2
SecondaryO2 /CO2
► Coaxial nozzle burne r Conve ntional de s ign for Air - PC fir ing 1s t & 2nd O2 dilute d by CO2
Comparis on of Air - & Oxy- fir ings us ing the s ame burne r
1st International Oxyfuel Combustion Conference
9/25
Re s ult: Coaxial Nozzle Burne r
► Te mpe rature f ie lds @ 0.1MWth, s wir l no.=0.7 Similar downs te am but diffe re nt ups tre am
Air- PC,
Oxy- PC, O2/CO2=29/71
Oxy- PC, O2/CO2=31/69
1st International Oxyfuel Combustion Conference
10/25
Re s ult: Coaxial Nozzle Burne r
► Ce nte rline te mpe rature Too c old @ O2/CO2=29/71 Ups tre am T can be increased by O2 enrichment. But st ill lower than that of Air- f ir ing by 80K. How to locally enrich O2 in near- f ield?
1st International Oxyfuel Combustion Conference
11/25
Burne r De s ign 2
Burne r Nozzle type Air- f ir ing Oxy- fir ing
Mixingnozzleburne r Secondary
swirl nozzle
Oxy nozzle
Coal nozzle
Coal +Primary CO2
SecondaryO2 /CO2
Primary O2
Coal +Primary air
Secondaryair
Not used
► Mixing nozzle burne r De s ign for pr imary O2 dire c t- inje c tion for Oxy- fir ing Atte mpt to inc re as e the ne ar- fie ld te mpe rature
by loc al e nric hme nt of O2
Comparis on of Air - & Oxy- fir ings us ing the s ame burne r
1st International Oxyfuel Combustion Conference
12/25
Re s ult: Mixing Nozzle Burne r
► Ce nte rline te mpe rature s Muc h lowe r T than Air- f ir ing over the whole region Maybe due to mixing retardat ion Then the hydrodynamic effects?
Cen
terl
ine
tem
pera
ture
[o C]
1st International Oxyfuel Combustion Conference
13/25
Re s ult: Mixing Nozzle Burne r
► Hydrodynamic e ffe c ts Total gas flow rate s e qually s us taine d by powe r inc re as e Similar T patte rns c an be obtaine d if hydrodynamic ally s imilar The n how to make s imilar hydrodynamic fie ld?
Cen
terl
ine
tem
pera
ture
[o C]
1st International Oxyfuel Combustion Conference
14/25
S imple Es timate s
► The rmal s imilar ity ► Hydrodynamic s imilar ity
The s ame he ating The s ame mome ntum flow rate
Diffic ult to make fie ld- s imilaritie s by Oxy- fir ing of Air- PC burne r
O2/N2 or O2/CO2
O2/N2 or O2/CO2
1st International Oxyfuel Combustion Conference
15/25
Swirling Mome ntum
► Anothe r c ons ide ration for hydrodynamic s imilar ity Swir ling mome ntum c ontrols
ne ar- fie ld flame s hape .
► Two parame te rs to be matc he d with thos e of Air-f ir ing Axial mome ntum flow rate s Swir ling mome ntum flow rate s
► How to make the s e @ the s ame powe r c ond.
1st International Oxyfuel Combustion Conference
16/25
Strate gy
► Proble m Smalle r volume flow rate of CO2 than that of N2
Mome ntum flow rate s of Oxy- fir ing le s s than thos e of Air -fir ing
How to make the e qual mome ntum flows
► Our s trate gy To make a s malle r Oxy- burne r than Air- burne r
to matc h the axial & s wir ling mome ntum flow rate s@ the s ame he ating/powe r c ondition
Sc ale - down of c oal & s wir l nozzle s
1st International Oxyfuel Combustion Conference
17/25
Burne r De s ign 3
Burne r Nozzle type Air- f ir ing Oxy- fir ing
Multinozzleburne r
6 Oxy nozzlein coal nozzle
Secondaryswirl nozzle Secondary
O2 /CO2
Coal +Primary CO2
Primary O2
► Multi- nozzle burne r Axial & s wir ling mome ntum matc he d with
thos e of a ir - f ire d c oaxial nozzle burne r
Primary O2 dire c t- inje c tion to e nhanc e flame s tability
Coal +Primary air
Secondaryair
Coaxia l burne r
1st International Oxyfuel Combustion Conference
18/25
Re s ult: Multi Nozzle Burne r
► Te mpe rature f ie lds @ 0.1MWth For Oxy- fir ing, O2/CO2=29/71 Sle nde r flame broade ne d by s wir l numbe r Ne ar- fie ld T increases as swir l number.
Coaxial nozzle burner, Air- f ir ing, Swirl=0.7
Mult i- nozzle burner, Oxy- f ir ing, Swirl=0.39
Mult i- nozzle burner, Oxy- f ir ing, Swirl=0.70
Mult i- nozzle burner, Oxy- f ir ing, Swirl=1.05
1st International Oxyfuel Combustion Conference
19/25
Re s ult: Multi Nozzle Burne r
► Ce nte rline te mpe rature s Large ly inc re as e d ups tre am T than other two burners Difference of downstream T <30K
1st International Oxyfuel Combustion Conference
20/25
Re s ult: Multi Nozzle Burne r
Air- PC, 0.1MWth, Swirl=0.7
Oxy- PC, 0.1MWth, O2/CO2=29/71, Swirl=0.7, 1s t O2/2nd O2=30/70
Oxy- PC, 0.1MWth, O2/CO2=29/71, Swirl=0.7, 1s t O2/2nd O2=25/75
► Effe c ts of 1s t vs . 2nd O2 flow rate s Ve ry s e ns itive on 1s t/2nd O2
1st International Oxyfuel Combustion Conference
21/25
Re s ult: Multi Nozzle Burne r
► Ce nte rline te mpe rature s Ve ry s e ns itive ne ar- fie ld T on 1s t/2nd O2
Optimal c ondition: 25%<1s t O2<30% @ e qual s wir l no. to Air - fir ing c oaxial burne r
1st International Oxyfuel Combustion Conference
22/25
Exhaus t CO2
► CO2 e xhaus t c onc e ntration for multi nozzle burne r Large r than 95% Max. of 97.9%
1st International Oxyfuel Combustion Conference
23/25
NOx Re duc tion
48mg/MJ
► NOx reduct ion by tert iary oxidant inject ionfor mult i nozzle burner Stage d s upply of oxidant
through s ide wall of the furnac e Re duc e d e mis s ion as inje c tion pos ition
& amount
No te rtiaryinje c tion CO<30ppm
1st International Oxyfuel Combustion Conference
24/25
Summary
► Atte mpt to make a s imilar T field of Oxy- f ir ing to that of Air- f ir ing
► Coaxial & mixing nozzle burners Diffic ult to make s imilar f ie lds by Oxy- fir ing
Hydrodynamic e ffe c ts on T f ie ld we re more important than e xpe c te d.
► Multi- nozzle burne r
Sc ale - down to matc h the axia l & s wir ling mome ntumsto that of Air- fir ing of c oaxia l burne r
Mos t s imilar T f ie ld@ O2/CO2=29/71, the e qual s wir l numbe r and 25%<1s t O2<30%
► Exhaus t CO2>95% for multi- nozzle burne rNOx e mis s ion<60mg/MJ by te rtiary oxidant inje c tion
Thank you for your at tent ion!
Dae Keun Lee, Ph.D.Energy Eff. & Materials Convergence Research DivisionKorea Institute of Energy [email protected]