123

CFD modelling of the decompression process of CO2 pipeline

Carbon Capture and Storage (CCS)

• This technology traps 90% of carbon dioxide.(Li, H. and J. Yan, 2009).

• CCS technology is aimed to reduce 50% of GHG by 2050 (Li, H. and J. Yan, 2009).

• In CCS process, a significant amount of carbon dioxide through pipe networks(Li, H. and J. Yan, 2009).

Fracture propagation

• Among operators creak propagation is a major concern (Elshahomi, A et al, 2013).

• Fracture propagation involves various technical aspects including decompression process (R. Cleaver and P. Cumber, 2000).

Decompression process

• The outflow of gas reduces the pressure in the neighbourhood of the opening and generates a decompression front (rarefaction wave) that propagates within the pipeline, away from the point of failure.

Battelle Two Curve Method (BTCM)

Decompression Models

• GASDECOM(19970)- Benedict-Webb-Rubin-Starling (BWRS) EOS)( Evgeniy Burlutskiy,2012)

• DECAY-Peng-Robinson (PR) EOS (K. K. Botros,et al 2013)

• DECOM-span and Wanger and GERG-2004 (Elshahomi, A et al, 2013)..

• CFDECOM-Peng-Robinson-Stryjek-Vera EOS along with the Peng-Ribinson and Span Wanger EOS

GERG 2008 EOS• Accuracy of these models proposed depends on EOS Employed

(Elshahomi, A et al, 2013).

• Basically to natural gas mixture, it also included carbon dioxide pure stage (O. Kunz and W. Wagner ,2012)

• GERG, AGA-8, BWRS, PR and RKS to compare denser phase region densities(Btros et.al .2013).

• GERG was more accurate than the rest of the EOS was concluded by Botros et. Al (Btros et.al as cited inLiu, X., et al.2014).

References. 1. Elshahomi, A., Lu, C., Michal, G., Liu, X., Godbole, A., Botros, K. K., Venton, P. & Colvin, P, 2013, “Two-dimensional CFD modelling of gas-decompression behaviour”, The 6th International Pipeline Technology Conference, pp. S18-02-1 - S18-02-23. United States: Clarion Technical Conferences.

2.. Evgeniy Burlutskiy,2012, “Mathematical Modeling of Non-Isothermal Multi-Component Fluid Flow in Pipes Applying to Rapid Gas Decompression in Rich and Base Gases”, World Academy of Science, Engineering and Technology, Vol:6,pp:117-112. 3. K.K. Botros , J. Geerligs , L. Carlsonb, M. Reed 2013, “Experimental validation of GASDECOM for High Heating Value Processed Gas mixtures (58 MJ/m3) by specialized shock tube” ,International Journal of Pressure Vessels and Piping,volume no:107,pp:20-26. 4. Li, H. and J. Yan, 2009, Evaluating cubic equations of state for calculation of vapor–liquid equilibrium of CO2 and CO2 mixtures for CO2 capture and ‐storage processes. Applied Energy.86(6): p. 826 836.‐ 5. Liu, X., A. Godbole, C. Lu, G. Michal, and P. Venton, 2014, Source strength and dispersion of CO2 releases from high pressure pipelines: CFD model ‐using real gas equation of state. Applied Energy. 126(0): p. 56 68.‐ 6. O. Kunz and W. Wagner ,2012, “The GERG-2008 Wide-Range Equation of State for Natural Gases and Other Mixtures: An Expansion of GERG-2004”, American Chemical Society,volume 57,3032-3091. 7. R. Cleaver and P. Cumber, 2000"Modelling pipeline decompression during the propagation of a ductile fracture", INSTITUTION OF CHEMICAL ENGINEERS SYMPOSIUM SERIES 147, pp. 201-212.