CO 2 removal from an IGCC power plant

1. CO2 removal from an IGCC power plant Comparison of the CO2capture options

2. Content • Scope of the study • The existing separation processes • Choice of separation process(es) • Integration in the IGCC • Conclusion

3. Scope of the study • The existing separation processes • Choice of separation process(es) • Integration in the IGCC • Conclusion

4. IGCC and CO2 abatement options • Pre combustion capture • Post combustion capture in an end of pipe process • Post combustion with CO2 working fluid and pure O2 combustion

5. Heat Recovery Dust Filter Desulfuration Coal Preparation Gasification O2 ASU From Tac compressor Electricity N2 TAV Saturation Heat Recovery Steam Generator Cycle Steam Air TAC Stack TAC : Combustion turbine TAV : Steam turbine ASU : Air separation unit

6. Scope of the study • The existing separation processes • Choice of separation process(es) • Integration in the IGCC • Conclusion

7. CO2 capture options • Chemical absorption • Physical absorption • Adsorption • Membrane

8. Chemical Absorption • Primary and secondary amines and Tertiary Amines : • Sterically hindered amines : AMP, 2-Amino-2-Methyl-1-Propanol • Mixed amines

9. Physical solvents • Selexol Dimethylether of Polyethylene Glycol • Purisol N Methyl Pyrrolidone • Rectisol Methanol

10. Scope of the study • The existing separation processes • Choice of separation process(es) • Integration in the IGCC • Conclusion

11. Choice of solvents • Chemical solvent AMP 30% wt • Hot potassium K2CO3 Carbonate* • Mixed amines MDEA 25% MEA 5% wt • Physical solvents METHANOL SELEXOL* NMP *with courtesy of UOP

12. Synthesis gas composition Synthesis gas pressure 24 bars abs. Flow rate 50 kg/s

13. Block diagram for physical solvent

14. Mains results • Solvents losses • Electrical consumptions • Steam consumptions

15. Results

16. Reboiler consumptions (MW)

17. Detailed cooling consumptions (MW)

18. Detailed cooling consumptions (MW)

19. Further work • The calculation of the CO2 separation integration will be performed with an international quality coal with : • Methanol • Selexol • The optimal CO conversion and CO2 removal will be studied • The overall electrical efficiency will be calculated

20. Scopeof the study • The existing separation processes • Choice of separation process(es) • Integration in the IGCC • Conclusion

21. Heat Recovery Dust Filter Desulfuration Coal Preparation Gasification O2 ASU From Tac compressor Electricity N2 TAV Saturation Heat Recovery Steam Generator Cycle Steam Air TAC Stack

22. Heat Recovery Dust Filter Desulfuration Coal Preparation Gasification Electricity TAV Heat Recovery Cycle Steam Steam Generator O2 ASU From Tac compressor steam N2 Shift Conversion CO2 Separation Saturation steam Air TAC Stack

23. Results for the Methanol process energetical comsumption

24. IGCC efficiency and CO2 removal Physical absorption, methanol Based case net efficiency : 43.34 %

25. Conclusion • Pre-combustion separation • Physical solvents are less demanding in electrical and steam, even with higher frigory needs • The overall net efficiency decreases of 8 points for 81 mole percent CO2 separation • Further work : Selexol integration Sensibility analysis for reduced separation rate