Experimental and Process Modelling Study of Integration of a Micro-turbine with an Amine Plant - presentation by Elvis Agbonghae of the University of Leeds at the UKCCSRC Natural Gas CCS Network Meeting at GHGT-12, Austin, Texas, October 2014

1. Energy Technology and Innovation Initiative (ETII)
FACULTY OF ENGINEERING
UNIVERSITY OF LEEDS
Experimental and Process Modelling Study of Integration of a Micro-turbine with an Amine Plant
Elvis O. Agbonghae‡, Thom Best, Karen N. Finney, Carolina Font Palma, Kevin J. Hughes, and Mohamed Pourkashanian UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 1
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‡Email: pmeoag@leeds.ac.uk and elvis.agbonghae@gmail.com

2. Introduction UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 2
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Turbec T100 PH Series 3 micro gas turbine
1 ton/day CO2 capture plant (based on MEA)

3. Aspen Plus Model for the Integrated Process (Main Flowsheet)
HIERARCHYAMINEB2B3HIERARCHYGTCO2 FUEL OXIDANT S1S2 S3S4
UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 3
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4. Aspen Plus Model for the Micro-turbine
COMBCOMPHX1INT-COOLTURB345678S1(OUT) FUELFUEL(IN) H2O-IN1 H2O-OUT1 OXIDANTOXIDANT(IN)
UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 4
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5. Aspen Plus Model for the Amine Plant UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 5
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6. Micro-turbine Model Validation
Micro-turbine
Experimental
Simulation
Fuel flowrate
0.00658 kg/s
0.00658 kg/s
Fuel temperature
ambient
15ºC
Air flowrate
0.6940 kg/s
0.6940 kg/s
Air temperature
ambient (average 20-22 ºC)
20ºC
Air pressure
1.013 bar
1.013 bar
Exhaust gas composition
CO2: 1.53 vol%
H2O: 3.46 vol%
O2: 17.90 vol%
N2: 77.11 vol%
CO2: 1.53 % mol
H2O: 2.89 % mol
O2: 17.72 % mol
N2: 77.84 % mol
Compressor pressure ratio
4.5 : 1
4.5 : 1
Turbine outlet temperature
645 ºC
649.4 ºC
Turbine pressure ratio
1 : 4.5
1 : 4.5
Net power output
80 kW
80 kW
UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 6
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7. Model Validation for the CO2 Capture Pilot Plant
L/G = 1.86 kg/kg
L/G = 3.77 kg/kg
Experiment
Simulation
Experiment
Simulation
Flue gas flowrate (Nm3/hr)
207.3±1.8
207.3
192.1±1.6
192.1
Flue gas temperature (oC)
41.3±0.5
41.3
39.4±0.3
39.4
Flue gas pressure (barg)
0.17±0.02
0.17
0.19±0.01
0.19
Flue gas composition
CO2 (mol%)
H2O (mol%)
O2 (mol%)
N2 (mol%)
4.48±0.11
-
-
-
4.48
2.96
17.04
75.52
4.55±0.11
-
-
-
4.55
2.96
17.04
75.45
CO2 in flue gas (kg/hr)
18.23±0.16
18.23
17.17±0.14
17.17
MEA concentration (wt%)
28.2±0.1
28.2
25.6±0.1
25.6
Lean MEA flowrate (kg/hr)
515.6±5.4
515.6
964.3±8.5
964.3
Lean MEA temperature (oC)
39.9±0.9
39.9
40±0.5
40
Lean MEA CO2 loading (mol/mol)
0.246±0.001
0.246
0.153±0.001
0.153
Condenser pressure (barg)
0.20±0.02
0.20
0.20±0.02
0.20
Rich MEA CO2 loading (mol/mol)
0.409±0.001
0.416
0.247±0.001
0.249
CO2 injected (kg/hr)
12.00±0.5
11.86
12.00±0.5
11.25
CO2 captured (kg/hr)
16.47±0.40
16.98
16.30±0.59
16.35
CO2 capture efficiency (%)
90.35±3.00
93.14
94.93±4.20
95.23
Specific reboiler duty (MJ/kg CO2)
5.92±0.80
5.47
13.27±2.21
17.25 7 UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014.
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8. Conclusions UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 8
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
The integration of a micro turbine to an MEA-based CO2 capture plant has been investigated experimentally and by way of process modelling.

The process modelling results for both the micro turbine and the CO2 capture plant are in good agreement with the experimental results.

The model will be used to plan future experiments at the UKCCSRC PACT core facilities.

9. Energy Technology and Innovation Initiative (ETII)
FACULTY OF ENGINEERING
UNIVERSITY OF LEEDS UKCCSRC Natural Gas CCS Network meeting at GHGT12. 7th October, 2014. 9
10/27/2014