2 Oxyfuel Conf Presentation DKLee

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


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?


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


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


6/25

Coal

► Te s t c oal Aus tralian bituminous c oal Coal analys e s


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


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


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


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?


11/25

Burne r De s ign 2


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


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]


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]


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


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.


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


17/25

Burne r De s ign 3


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


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




19/25


► 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


20/25


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


21/25


► 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


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%


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


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]

2 Oxyfuel Conf Presentation DKLee

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