co2quest - ukccsrc · materials selection s brown, s martynov, h mahgerefteh (ucl) d van hoecke, s...
TRANSCRIPT
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CO2QUEST
Materials Selection
S Brown, S Martynov, H Mahgerefteh (UCL)D Van Hoecke, S Cooreman (OCAS)
EC FP7 Projects: Leading the way in CCS implementation14 – 15 April 2014, London, UK
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Fracture Propagation in Pipelines
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Fracture Propagation in Pipelines
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Fracture Propagation in Pipelines
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Modelling pipeline fractures requires accounting for the following fluid/structure interactions:
•Real fluid behaviour•Fluid/wall heat transfer•Fluid/wall friction•Pipeline arrest pressure,
} Pt Pa
(CFD)
(Fracture mechanics)
Fluid/Structure Interaction
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A ductile fracture will come to rest when the Crack Tip Pressure, Pt
falls below the Crack Arrest Pressure, Pa.
Ductile Fracture – Background Theory
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393.0
167.0
a
t
P
p
flowc P
P
AD
v
The fracture equation developed by the High-Strength Line Pipe (HLP) Committee, Japan, is applied in this work:
Where
vc,crack propagation velocity
σflow, flow stress (yield and tensile stress mean)
Dp, pre-cracked Drop Weight Tearing Test energy
Ap, ligament area (shaded area )
Pa, arrest pressure
Pt , crack tip pressure
Simplified Modelling – BTC Model
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The arrest pressure is calculated from
Where
tw, pipeline thickness
D, outer diameter of the pipe
σflow, flow stress (yield and tensile stress mean)
Dp, pre-cracked Drop Weight Tearing Test energy
Ap, ligament area (shaded area )
Pa, arrest pressure
2
710813
1cos3820flow
p
p
σDt
AD
.
floww
a eσDt
.P
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Table 1. Pipeline characteristics and prevailing conditions utilised for fracture propagation simulations.
Parameter ValueInternal diameter (m) 0.5905Wall thickness (mm) 9.45Line pressure (barg) 100,180
Ambient pressure (bara) 1.01Ambient temperature (oC) 20
Feed temperature (oC) 0,10,20,30Pipe length (m) 500
Tensile stress (MPa) 531Yield stress (MPa) 448
Pipe wall roughness (mm) 0.05Heat transfer coefficient
(W/m2K)5
Wind speed (m/s) 0Pipe grade X65
Fracture toughness (J) 50
Case Study
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10
0
50
100
150
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350
0 10 20 30 40 50 60 70Crack Length (m)
Cra
ck V
eloc
ity (m
/s)
0
50
100
150
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250
300
350
0 10 20 30 40 50 60 70Crack Length (m)
Cra
ck V
eloc
ity (m
/s)
0
50
100
150
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300
350
0 10 20 30 40 50 60 70Crack Length (m)
Cra
ck V
eloc
ity (m
/s)
0
50
100
150
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350
0 10 20 30 40 50 60 70Crack Length (m)
Cra
ck V
eloc
ity (m
/s)
100 m pipe, 100 barg
30 oC
20 oC
10 oC
0oC
CO2
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0
20
40
60
80
100
120
-20 -10 0 10 20 30 40
Temperature (oC)
Pres
suer
(bar
a)
0
20
40
60
80
100
120
-20 -10 0 10 20 30 40
Temperature (oC)
Pres
suer
(bar
a)
0
20
40
60
80
100
120
-20 -10 0 10 20 30 40
Temperature (oC)
Pres
suer
(bar
a)
0
20
40
60
80
100
120
-20 -10 0 10 20 30 40
Temperature (oC)
Pres
suer
(bar
a)
The variation of crack tip pressure with temperature, 100 m pipe, 100 barg CO2 pipe at different line temperatures.
Arrest Pressure
Saturation Curve
30 oC20 oC
10 oCLiquid
Gas
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Table 2. CO2 stream compositions based on the various capture technologies (ICF International, 2010).
Species Post-combustion
Pre-combustion
Oxy-fuel
CO2 99.82 95.6 88.4Ar 0 0 3.7CO 0 0.4 0N2 0.17 0.6 2.8
H2S 0 3.4 0Cl 0 0 0.14H2 0 0 0O2 0.01 0 3.6
SO2 0 0 1.36H2O 0 0 0NO2 0 0 0
Impact of Mixture Composition
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0oC,10 oC,20 oC
30 oC
Pre- combustion: 180 barg.
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30 oC and 20 oC
10 oC
0 oC
oxy-fuel, 100 barg.
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Fracture Propagation Results (100 barg)
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CO2QUEST
• Damage model - Implementation
Rigorous Fracture Modelling
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17CO2QUEST
Damage Model – Parameter calibration
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18CO2QUEST
Damage Model – Validation
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19CO2QUEST
Damage Model – Validation cont.
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20CO2QUEST
• Prediction of crack propagation in CO2 pipeline• Pipe ID = 233 mm, pipe WT = 20 mm• Internal pressure: 150 bar• Initial crack length: 2 OD• Only one quarter modelled because of symmetry• Total simulation time: 10 ms
2 m
Damage Model – Case Study
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21CO2QUEST
Prediction of crack propagation in CO2 pipeline1 2
3 4
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Damage Model – Case Study - Results
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Fracture Propagation in Pipelines
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2323
Brittle Fracture – Background Theory
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Charpy test results
Battelle test results
Materials Testing – X70 Steel
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The research leading to the results described in this presentation has received funding from the European Union 7th Framework Programme FP7-ENERGY-2012-1-2STAGE under grant agreement number 309102.
The presentation reflects only the authors’ views and the European Union is not liable for any use that may be made of the information contained therein.
Acknowledgements and Disclaimer