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Process design and analysis of dual phase membanes
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Process design and analysis of dual phase membanes Presentation Transcript

  • 1. 1Process design and analysis ofdual-phase membranes foroff-shore post-combustion capturefrom gas turbinesRahul AnantharamanSINTEF Energy ResearchMichael McCann, Thijs Peters, Marie-Laure Fontaine, Partow P. Henriksen, Thor MejdellSINTEF Materials and Chemistry7thJune, 2013
  • 2. Presentation Outline►Background►Motivation►Dual-phase membranes►Process design considerations►Process Analysis►Conclusions2
  • 3. Background►CO2 capture from industry is an important part of thesolution for climate change mitigation►Four case studies selected in BIGCCS for CO2 capturefrom industry►CO2 emissions from off-shore facilities are some of thelargest point sources.►CO2 capture from gas turbines on board an FloatingProduction Storage and Offloading (FPSO) unit one ofselected case study.3
  • 4. Case Study►Aim: CO2 capture from 6 x 20 MW Gas Turbines (GT) on board anFPSO►GT specifications (each) Power: 20 MW (Simple cycle) Thermal efficiency: 36.4% LHV Exhaust flow: 67.4 kg/s Exhaust temperature: 466 °C CO2 concentration in exhaust: 3 vol%4
  • 5. Challenges►All of the challenges offshore are the same as the onesfaced by on-shore industry, in addition to size, weight andstability (wave motion).►Space- and weight challenges implies the size of thecapture installations will be of importance when selectingcapture technology5
  • 6. Process concepts►Post-combustion capture MEA – reference case Membrane contactors Dual phase membranes Supersonic expansion of CO2►Oxy-combustion capture6
  • 7. Motivation► MEA and other solvent based capture technologies Gas-liquid interface Steam/utility requirement Require large absorber GT exhaust needs to be cooled► Membrane contactors not effective for this case► Polymeric membranes Multi-stage process due to selectivity limitations High energy consumption and membrane area/volume GT exhaust needs to be cooled7
  • 8. Motivation►Design conceptual process with No gas – liquid interface Operate at high temperature No steam requirement Comparable or lower volume and energy consumption thanreference case8
  • 9. Dual-Phase Membrane Concept►New interesting membrane type with potential of hightemperature operation (450°C-800°C)►Interconnected molten carbonate phase in a porousceramic support matrix of an oxygen ion conductor9
  • 10. Process design10( )RTECOpermeateCOfeedsideCOaeppLaJ /2 22ln=►For a given membranethickness, increase flux by Increasing feed pressure Decreasing permeate pressure Decreasing permeate xCO2 Increasing operating temperature
  • 11. Process Considerations11
  • 12. Process Design Assumptions►Membrane thickness: 100 micron►Membrane geometry: 300 m2/m3►CO2 capture rate: 90%►Permeate side pressure: 0.003 bar – 0.001 bar►Compressor efficiency: 80%►Vacuum pump efficiency: 75%12
  • 13. Effect of Temperature and Pressureratio on membrane volume13
  • 14. Effect of membrane thickness14Membrane Operating Temperature = 466°C
  • 15. Process design superstructure15
  • 16. Power consumption evaluation►NG equivalent power is calculated as LHV heat input x Efficiency (36.4%)16Membrane Operating Temperature = 500°C
  • 17. Membrane volume and powerconsumptionAdiabatic compression17
  • 18. Membrane volume and powerconsumptionIsothermal compression18
  • 19. Reference case – MEA process►Reference case simulation for MEA process wasperformed in CO2SIM19
  • 20. Reference case - MEA processPower Consumption►Exhaust gas fans: 8 MWe►Solvent circulating pumps: 4.8 MWe►Reboiler duty: 60.7 MWth►Steam parameters: 3 bar 145°C►Equivalent Power: 20 MWe►Total power consumption: 32.8 MWe20Gottlicher, G, Energetics of CO2 capture
  • 21. Comparing performance21MEA Absorber + Stripper volumeMEA Power consumption
  • 22. Comparing performance - Exergy22MEA Exergy requirement
  • 23. Conclusions►Dual phase membranes show promising performance►Preliminary results comparing to MEA process indicate lower process equipment volume Comparable/lower energy penalty for CO2 capture►It is expected that dual phase membranes will performbetter for "standard" NGCC post-combustion capture►Novel technology in early phase of development►Potential issues Membrane development and performance Feasibility of high temperature vacuum pump23
  • 24. AcknowledgementsThis publication has been produced with support from the BIGCCSCentre, performed under the Norwegian research program Centres forEnvironment-friendly Energy Research (FME). The authors acknowledgethe following partners for their contributions: Aker Solutions,ConocoPhillips, Gassco, Shell, Statoil, TOTAL, GDF SUEZ and theResearch Council of Norway (193816/S60).