Sheraz Daood (University of Sheffield) - Experimental Investigation with PACT Facility and CFD Modelling of Oxy-Coal Combustion with Recycling Real Flue Gas and Vent Gas of Compression and Purification Units - UKCCSRC Cranfield Biannual 21-22 April 2015

1. Experimental Investigation with PACT
facility and CFD modelling of oxy-coal
combustion with recycling flue gas
S. S. Daooda, J. Szuhanszkia,, L. Maa, W. Nimmoa, M. Pourkashaniana
H. Liub, C. Snapeb, C. Sunb
a Energy Engineering Group, Energy 2050, Department of Mechanical Engineering, University of Sheffield, UK
bDepartment of Architecture and Built Environment, Faculty of Engineering, University of Nottingham, UK
Corresponding author: w.nimmo@sheffiled.ac.uk; liu.hao@nottingham.ac.uk

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Contents
• The Project
• 0.25MWth combustion test facility
• Results- discussions
• Summary

3. The Project
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Air
Separation
Unit
BoilerAir
N2
O2
ESP/
Bag house
Condenser
Fly Ash
C P U
Water
Vent Gases
Recycle gas (Secondary : Tertiary oxidant)
Coal
pulveriser
Coal
Dry recycle for primary oxidant
Non condensable
CO2

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0.25MWth PACT Facility- upper level
Heating Element for
Oxidants
Combustion modules
of the furnace
Flue Section
Cyclone Separator

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0.25MWth PACT Facility- bottom level
Combustion modules of the
furnace- bottom level
Coal feeder
Control Panel

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0.25MWth PACT Facility-NO inj. skid
NO injection skid- safety relief
valve, shut off valve
NO injection metered
skid

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0.25 MWth PACT Facility -Burner
3D geometry burner
Split
Position- mm
Secondary
Split, %
Tertiary
Split, %
0 100 0
8 85 15
28 48 52
39 45 55
49 30 70
65 0 100
0 8 28 39 49 65 mm
1- Black, S. (2014) CFD modelling of oxy-fuel combustion for carbon capture. PhD thesis, University of Leeds.
2- Szuhanszki, J. (2014) Advanced oxy-fuel combustion for carbon capture and sequestration. PhD thesis, University of Leeds.

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NO Injection- Primary Air
1- Black, S. (2014) CFD modelling of oxy-fuel combustion for carbon capture. PhD thesis, University of Leeds.
2- Szuhanszki, J. (2014) Advanced oxy-fuel combustion for carbon capture and sequestration. PhD thesis, University of Leeds.
0 18 50 91
NOxreportedasNO2,mg/MJ
NO injected in Primary, mg/MJ
39 mm split (Theoretical expected NO)
39 mm split (Sec45: Ter 55)- Residual of injected NOx in flue
39 mm split (Sec45: Ter 55)- NOx Coal baseline
NO destruction ~ 100%

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NO Injection- Air (Prim.+Sec.+Ter)
0 91 250 455
NOxreportedasNO2,mg/MJ
NO injected in Primary+Secondary+Tertiary, mg/MJ
39 mm split (Theoretical expected NO)
39 mm split (Sec45: Ter 55)- NOx Coal baseline
39 mm split (Sec45: Ter 55)- Residual of injected NOx in flue
NO destruction ~ 86%

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NO Injection- Oxy 28%
0 52 143 259
NOxreportedasNO2,mg/MJ
NO injected in Secondary+Tertiary, mg/MJ
39 mm split (Theoretical expected NO)
39mm split (Sec 48: Ter 52)-NOx coal baseline
39 mm split (Sec45: Ter 55)- Residual of injected NOx in flue
NO destruction ~ 75%

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Summary
• Achievements
• Installation and commissioning of the NO injection skid.
• Optimization of the combustion test facility i.e. flows; emissions; combustion efficiency
• Results
• 100% NO destruction of the injected NO in Primary air stream
• Overall 85% NO destruction in all air streams.
• An overall 75% NO destruction- Oxy 28%
• Work in progress
• (NO injection in Oxy 25, 31% ; 2D flame imaging; In-flame measurements; NO
injection in recycle flue gas).
• The validation of the CFD results is under progress.

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Acknowledgements
• The project investigators would like to acknowledge the financial support
of the UK CCSRC to the project.
• The in-kind supports of the industrial partners are also greatly
appreciated by the project investigators.

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Thanks