Presentation given by Dr Carolina Font Palma from University of Leeds on "Oxyfuel Power Plant with Novel CO2 Separation and Compression Technology" in the Process Engineering Technical Session at the UKCCSRC Biannual Meeting - CCS in the Bigger Picture - held in Cambridge on 2-3 April 2014

1. Oxyfuel Power Plant with Novel CO2
Separation and Compression Technology
Carolina Font Palma
UKCCSRC Biannual Meeting
3 April 2014

2. Agenda
• Introduction to OxyPROP project
• CPU Scheme selection
• Power plant model
• Steam cycle model and heat integration
• Results
• Conclusions

3. Project motivation
Aim
• Target the key penalties for oxyfuel combustion of coal in boiler plant
through the application of Costain CO2 separation and compression
technology
Approach
• Team of experts working together without barriers
• Building from existing Costain patent applications
• Combined experience to benefit the project
• Collaborative approach integration of the processes with the power plant
Goals
• Demonstrate performance goals vs. an established base case

4. Project basis
IEA Greenhouse Gas R&D Programme Report 2005/09 (July 2005)
- Advanced Supercritical Pulverised Fuel-fired Power plant
ESP

5. CO2 Purification Unit (CPU)
Flue gas
Compression and
Pre-treatment
Low Temperature
Processing
Power
recovery
CO2 Product
Compression
Vent
CO2
Product

6. CPU scheme: base case
̴ - 55°C
CO2 purity
96%,
recovery 90%

7. Project CPU scheme
Close heat
integration
Maximised
product
pressures

8. Flue Gas compressor
– Base case
45.1 MW
280°C
10.7 MW
83°C
Flue Gas Compressor Power Consumption:
Energy Released from Coolers Over 150°C:
53.4 MW
22.4 MW
Stage 4Stage 3Stage 2Stage 1

9. Flue Gas compressor
- Maximum cooling
Stage 4Stage 3Stage 2Stage 1
9.6 MW
92.0°C
14.4 MW
113.5°C
14.2 MW
114.2°C
12.2 MW
95.7°C
Flue Gas Compressor Power Consumption:
Energy Released from Coolers Over 150°C:
46.6 MW
0 MW

10. Modelling approach
• Base case: IEAGHG 2005/9 ‘Oxy combustion processes for
CO2 capture from power plant’
– Boiler
– Steam cycle
– CO2 compression and purification unit
• Model integration
– Costain process for CO2 purification and compression

11. Oxy-fuel Power Plant
FLASH1
HIERARCHY
BOILER
SPLIT1
HIERARCHY
STEAM-T
CLCHG
HIERARCHY
ASU
HIERARCHY
CPU
FG-COOL
ESPCOAL
DUST
G-CO2
G7
G8
G11
G12
H2O
OXIDANT
RECYCLE1
S4
S5
S6
S2
S3
CO2-STG
AIR
G10
S8
G9
S7

12. Fuel:
bituminous coal, CGV of 27.06 MJ/kg, moisture content of 9.5 wt.%,
ultimate analysis
Oxidant:
oxygen purity of 95% (mol)
Boiler simulation
Input parameters
Parameter Units Value
Pressure Bara 1.01
Temperature °C 15.00
Ultimate Analysis wt.% (dry)
Ash 13.48
Carbon 71.36
Hydrogen 4.84
Nitrogen 1.56
Chlorine 0.03
Sulphur 0.95
Oxygen 7.78

13. Model validation
Flue gas from furnace Flue gas for CO2 purification
Stream (kg/s) IEAGHG
2005/09
Simulation
(GAS2)
IEAGHG
2005/09
Simulation
(G-CO2)
O2 24.13 23.61 8.15 8.05
CO2 451.51 450.96 136.04 136.96
N2 48.29 47.50 17.42 17.28
H2O 52.98 53.75 3.21 3.77
HCl 0.046 0.053 0.014 0.016
Ar 13.07 13.03 3.99 4.01
NO 1.41 0.43
NO2 0.161 0.001 0.050 0.0003
SO2 3.21 3.28 0.940 0.997
C 0.136 0.136
Ash 7.09 7.09
Total 600.65 600.84 169.84 171.51
Temperature (°C) 1935 2039 35 35

14. B23
ECONOMIS
SH
SEP
RH
BURNER
B18
B12
B4 B1
Q
HXFLUX
B3
S7
G6
BOILERFWS1(IN)
GAS4
S3
G5
HPIN
S4(OUT )
GAS3
SLAG RHIN
S5(IN)
IP1INS6(OUT )
AIR-LEAK
G3
GAS1
G4
GAS2
RAD
S9
S10 S8(OUT )
S12
Boiler simulation
IEAGHG report Simulation
Hot
outlet
Cold
outlet
Hot
outlet
Cold
outlet
Boiler 1102 520 1102 520
Super-
heater
920 600 919 600
Re-
heater
579 620 581 620
Econo
miser
340 334 345 334Economiser
Reheater
Superheater
Temperature profile (°C)

15. Steam cycle

16. Heat integration

17. Performance comparison
Base Case Project Case (LT)
CPU expander output 9.97 9.85
Total turbine train output 774.93 768.07
Gross power output 784.90 777.92
ASU duty 86.74 86.74
Total CPU compressor duty 74.21 60.37
Auxiliary duty 57.42 57.67
Total losses 218.37 204.78
Net plant output 566.53 573.14
Fuel heat input (MWth) 1502.2 1502.2
Plant efficiency % 37.71 38.15
CO2 purity (% mol) 95.4 98

18. Conclusions
• Steady-state integrated model to analyse Power plant
performance modelling and penalty reductions for Oxyfuel
combustion
• Performance gains (increased %LHV efficiency and increased
CO2 purity), through heat integration method and modified
low temperature process within the CPU
• The highest efficiency was achieved for compression trains
with conventional interstage temperatures and carefully
integrated intercooler/aftercooler duties

19. Thank you!
Team:
 University of Edinburgh
• Dr Hannah Chalmers
• Dr Mathieu Lucquiaud
• Olivia Errey
• Prof Jon Gibbins
 University of Leeds
• Dr Carolina Font Palma
• Dr Richard Porter
• Prof Mohamed Pourkashanian
• Dr Kevin Hughes
 Costain
• Caroline Corden
• Steve Jackson
• Brian Elliff
• Daniel Medcalf
• Michael Taylor
• Dr Bryony Livesey
Acknowledgement:
 DECC CCS Innovation Programme
“OXYPROP – Oxyfuel Penalty Reduction
Project”