Hybrid Process for CO2 Capture: Membrane Separation & Adsorption Equilibrium

1. Prof. Krzysztof WarmuzinskiPolish Academy of SciencesInstitute of Chemical Engineering The capture of CO2 from flue gas using adsorption combined with membrane separation 6th International Scientific Conference on Energy and Climate Change

2. CO2 CAPTURE • Post-combustion systems • Pre-combustion systems • Oxyfuel combustion • Post-combustionsystems, which separate CO2 from flue gases produced by the combustion of a primary fossil fuel (coal, natural gas, oil) or biomass in air 6th International Scientific Conference on Energy and Climate Change

3. POST-COMBUSTION CO2 CAPTURE • Absorption • Membrane separation • Adsorption (PSA, TSA) • Hybrid systems 6th International Scientific Conference on Energy and Climate Change

4. SEPARATION PROPERTIES OF POLYMERIC MEMBRANES ADSORPTION EQUILIBRIA AND KINETICS ON ZMS 13X MATHEMATICAL MODEL OF THE HYBRID PROCESS DEMONSTRATION HYBRID INSTALLATION EFFECT OF GAS FLOW RATES IN THE REGENERATION AND PURGE STEPS ON CO2 PURITY AND RECOVERY HYBRID PROCESS FOR CO2 REMOVAL FROM FLUE GAS HYBRID PROCESS FOR THE CAPTURE OF CO2 FROM FLUE GAS 6th International Scientific Conference on Energy and Climate Change

5. Demonstration hybrid installation 6th International Scientific Conference on Energy and Climate Change

6. Demonstration hybrid installation 6th International Scientific Conference on Energy and Climate Change

7. Objectives of the study • Theoretical and experimental determination of the principal parameters of product streams (i.e. the purified gas stream and the CO2-rich stream), especially from the standpoint of purity requirements associated with the transport and storage of CO2 • Analysis of the effect of two crucial process parameters– gas flow rates in the regeneration and purge steps – on the recovery of CO2 and its concentration in the enriched stream 6th International Scientific Conference on Energy and Climate Change

8. The PSA cycle 6th International Scientific Conference on Energy and Climate Change

9. Basic parameters of the process 6th International Scientific Conference on Energy and Climate Change

10. Properties of the adsorbent 6th International Scientific Conference on Energy and Climate Change

11. Properties of the adsorbent Multisite Langmuir isotherm Mass transfer coefficients CO2: 1.22∙10-2 s-1, N2: 7.01∙10-2 s-1 for N2, O2: 7.59∙10-2 s-1 6th International Scientific Conference on Energy and Climate Change

12. Properties of the membrane module 6th International Scientific Conference on Energy and Climate Change

13. Modelling of the hybrid separation of CO2 from flue gas streams • Model of the PSA separation • Model of the membrane separation • Integration of the PSA and membrane modelsinto PSE gPROMS software package 6th International Scientific Conference on Energy and Climate Change

14. Model of the PSA separation • Plug flow with axial dispersion is assumed • The feed may contain N adsorbing species • Process is non-isothermal with thermal equilibrium between the gas and the solid phase • Pressure drop over the adsorbent bed is negligible • Adsorption equilibria are described by non-iterative isotherm equation (e.g. multisite Langmuir, Langmuir-Freundlich, etc.) • The fluid phase is modelled as an ideal gas 6th International Scientific Conference on Energy and Climate Change

15. Model of the membrane separation • Plug flow on the feed side and unhindered flow on the permeate side • The feed may contain N permeating species • There are no interactions between the permeating gases • Permeation coefficients are independent of pressure • Pressure drops are negligible on both sides of the membrane • The process is isothermal 6th International Scientific Conference on Energy and Climate Change

16. Numerical solver • PSE gPROMS package • Built-in reliable and stable numerical methods • Flexibility in defining the complex network of interconnecting components for the whole system 6th International Scientific Conference on Energy and Climate Change

17. CO2 recovery and its concentration in the enriched gas Gas flow rates in the purge step of the PSA cycle: 6.4 m3(STP)/h 6.8 m3(STP)/h  7.2 m3(STP)/h 6th International Scientific Conference on Energy and Climate Change

18. CO2concentration and gas flow ratein the membrane module Gas flow rates in the purge step of the PSA cycle:6.8 m3(STP)/h inlet to the membrane module permeate outlet 6th International Scientific Conference on Energy and Climate Change

19. Experimental results 6th International Scientific Conference on Energy and Climate Change

20. CONCLUSIONS • In the process analyzed, it is possible to raise CO2 concentration from 13.3 vol.% to over 97 vol.%, with a virtually total recovery • The CO2 concentrations obtained are sufficient from the standpoint of CO2 transportation and storage • For three different flow rates during purge with the enriched stream (6.4, 6.8 and 7.2 m3 (STP)/h) the limiting values were determined for the regenerating streams (0.7, 0.9 and 1.1 m3 (STP)/h, respectively). These values lead to the maximum CO2 concentrations in the enriched product without any CO2 breakthrough into the purified stream 6th International Scientific Conference on Energy and Climate Change

21. THANK YOU FOR YOUR ATTENTION 6th International Scientific Conference on Energy and Climate Change