effect of oxy-fuel combustion with steam and biomass
TRANSCRIPT
National Coal Institute (INCAR-CSIC)
www.incar.csic.es
J. Riaza, L. Álvarez, M.V. Gil, C. Pevida, J.J. Pis, F. Rubiera
Effect of oxy-fuel combustion with steam and biomass addition on coal burnout in an entrained flow reactor
Energy Processes and Emission Reduction Group
Energy Processes and Emission Reduction Group
Figure by courtesy of Vattenfall
Energy Processes and Emission Reduction Group
To evaluate the effect of:
Water vapour recirculation in the oxyfuel combustion (10 and 20 vol. %).
Biomass blending with the coal under oxyfuel conditions in an entrained flow reactor (10 and 20 w.%).
Burnout NO
Emissions
N2 / O2 / CO2 / H2O
Fuel
Exhaust gases
Entrained Flow Reactor
Energy Processes and Emission Reduction Group
Characteristics
Entrained Flow Reactor
Cyclone
Filter
Injector
Flow
straighteners
Heating resistance
Pre-heater
Insulator
Sampling probe
Cooling water
Suction pump
Feeding system
N2 / O2 / CO2 / H2O Cooling
air
Fuel
Quenching gas
O2 N2O
CO2 CO
NO SO2
Gas analysers
Feeding system
Wall temperature: 1273 K
Reactor zone length: 1.4 m
Reactor diameter: 40 mm
Residence time 2.5 sec
Continuous coal feeding system
Gas analysers: O2, CO2, NOX, SO2, CO
Energy Processes and Emission Reduction Group
db: dry basis; daf: dry and ash free bases; *Calculated by difference.
Ash V.M. F.C.+ C H N S O+
HV semi-anthracite 10.7 9.2 80.1 91.7 3.5 1.9 1.6 1.3 31.8
SABhigh-volatile
bituminous coal15.0 29.9 55.1 81.5 5.0 2.1 0.9 10.5 27.8
BAhigh-volatile
bituminous coal6.9 33.9 59.2 88.4 5.5 1.9 1.1 3.0 33.1
OR olive residue 7.6 71.9 20.5 54.3 6.6 1.9 0.2 37.0 19.9
Sample Rank/OriginProximate Analysis
(wt%, db)
Ultimate Analysis
(wt%, daf)
HHV
(MJ/kg,db)
75-150 µm
Energy Processes and Emission Reduction Group
BIOMASS ADDITION
+ 10 % + 20 % WEIGHT
WATER VAPOUR ADDITION
Energy Processes and Emission Reduction Group
92.5 93.9
95.2
90.2 92.7 93.0 93.9
95.0 95.8 94.7 95.7
97.8
50
60
70
80
90
100
SAB 90%SAB-10%OR 80%SAB-20%OR
Bu
rno
ut
(%)
79%N2-21%O2 79%CO2-21%O2
70%CO2-30%O2 65%CO2-35%O2
Energy Processes and Emission Reduction Group
79.4 80.4
83.0
92.5 93.9
95,2
77.2
79.7 81.0
90.2
92.7 93.0
80.7
83.5
86.1
93.9 95.0
95.8
84.2 83.5 85.5
94.7 95.7
97.8
50
60
70
80
90
100
HV 90%HV-10%OR 80%HV-20%OR SAB 90%SAB-10%OR 80%SAB-20%OR
Bu
rno
ut
(%)
79%N2-21%O2 79%CO2-21%O2 70%CO2-30%O2 65%CO2-35%O2
Energy Processes and Emission Reduction Group
N2 / O2 / CO2
Fuel
NO Emissions 21 % O2 - 79% N2
21 % O2- 79% CO2 30 % O2- 70% CO2 35 % O2- 65% CO2
Exhaust gases
Energy Processes and Emission Reduction Group
6.3
5.2
3.6
5.0
4.0
2.2
5.1
4.2
2.4
5.2
3.9
2.6
0
1
2
3
4
5
6
7
SAB 90%SAB-10%OR 80%SAB-20%OR
mg
NO
/ g
bu
rne
d f
ue
l
79%N2-21%O2 79%CO2-21%O2
70%CO2-30%O2 65%CO2-35%O2
Energy Processes and Emission Reduction Group
Sample N
HV 1.9
SAB 2.1
OR 1.99,7
8,8
6,6 6,3
5,2
3,6
6,7 6,5
6,1
5,0
4,0
2,2
6,9 7,1
6,6
5,1
4,2
2,4
7,4
6,5 6,5
5,2
3,9
2,6
0,00
2,00
4,00
6,00
8,00
10,00
HV 90% HV-10% OR 80% HV-20% OR SAB 90%SAB+10%OR 80%SAB+20%OR
mg
NO
/ g
bu
rne
d f
ue
l
79%N2-21%O2 79%CO2-21%O2
70%CO2-30%O2 65%CO2-35%O2
NH3
HCN
NO
Energy Processes and Emission Reduction Group
BIOMASS ADDITION
+ 10 % + 20 % WEIGHT
WATER VAPOUR ADDITION
Dry recycle
0% H2O 10% H2O 20% H2O
21% O2 - 79% N2 21% O2 - 69% N2 - 10% H2O 21% O2 - 59% N2 - 20% H2O
21% O2 - 79% CO2 21% O2 - 69% CO2 - 10% H2O 21% O2 - 59% CO2 - 20% H2O
30% O2 - 70% CO2 30% O2 - 60% CO2 - 10% H2O 30% O2 - 50% CO2 - 20% H2O
35% O2 - 65% CO2 35% O2 - 55% CO2 - 10% H2O 35% O2 - 45% CO2 - 20% H2O
Wet recycle
Energy Processes and Emission Reduction Group
50
60
70
80
90
100
21%O2-79%N2 21%O2-79%CO2 30%O2-70%CO2 35%O2-65%CO2
Bu
rno
ut
(%)
HV
HV+ 10%H2O
HV+ 20%H2O
BA
BA+ 10%H2O
BA+ 20%H2O
Energy Processes and Emission Reduction Group
9,7
6,7 6,9
7,4 7,7
5,9 6,3
6,8 6,7
5,0 5,5
6,5 6,9
6,0 6,4
6,6
6,1
4,8
5,6 5,2
0,00
2,00
4,00
6,00
8,00
10,00
79%N2-21%O2 79%CO2-21%O2 70%CO2-30%O2 65%CO2-35%O2
mg
NO
/ g
bu
rne
d f
ue
l
HV
HV+5%H2O
HV+10%H2O
HV+20%H2O
BA
BA+10%H2O
BA+20%H2O
Energy Processes and Emission Reduction Group
• Replacing N2 by CO2 caused a decrease in the burnout values. When the O2 concentration was increased to 30% the burnout value was higher than in air conditions.
• A increase in the burnout value was observed after the addition of biomass.
• The emissions of NO during oxy-fuel combustion were lower than under air. However, they remained similar under all the oxy-fuel atmospheres with increasing O2 concentrations.
• Emissions of NO were significantly reduced by the addition of biomass to the bituminous coal, although this effect was less noticeable in the case of the semianthracite.
• No significant effect was observed in the burnout after the addition of steam.
• In general the presence of steam reduce the emissions of NO
Thanks for your attention!
Energy Processes and Emission Reduction Group
Acknowledgements CSIC (Project PIE 201080E09). J.R. acknowledges funding from the Government of the Principado de Asturias. L.A and M.V.G. acknowledge funding from the CSIC JAE-Pre and CSIC JAE-Doc programs, respectively, co-financed by
the European Social Fund.
Effect of oxy-fuel combustion with steam and biomass addition on coal burnout in an entrained flow reactor