Hydrogen Membrane Reformer Technology

							                            INTERNAL




Hydrogen Membrane
Reformer Technology



                6.11.2003
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             Hydrogen Mixed Conducting Membranes



                          PH2(I)                     PH2(II)
                                        e-
                      ½ H2                               ½ H2
                                        H+
                       (Syngas)                   (Hydrogen)
            ½ H2          H+ + e-             H+ + e-           ½ H2
                                   PH2(I) > PH2   (II)


              •Driving force for H2: H2 flux ≈ log PH2(I) / PH2(II)
              •Membrane material 100% dense
   EPI
Porsgrunn                                                        KÅ - Date: 2003-11-04 - Page: 2
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             Hydrogen Membrane Reformer


            • extract product gas (H2) from reactor
            • drive equilibrium limited reactions towards
              completion
            • expand allowed range of temperatures and
              pressures

                                ΔH = + 165 KJ/mol
                                                       CO2
                 CH4 + H2O
                             CH4 + 2H2O = 4 H2 + CO2
              H2 transport                             H2
               membrane
   EPI
Porsgrunn                                              KÅ - Date: 2003-11-04 - Page: 3
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              H2 Generator System step 1 & 2

                                                                            Air
       H2 membrane                                 H2 membrane

                             1   N2+H2O            3
            Air                  (Sweep)               N2+H2O+H2
                         Q Q                                                CC
            CH4 /                     Residual
            H2O                         Gas    H2 H2   Syngas
                      H2 H2
                                                   4                   Air/H2O
                             2



                  1   ½ O2+H2 = H2O            3   Sweep


                  2   CH4+H2O = CO+3H2         4
                                                   CH4+H2O = CO+3H2
                      CO +H2O = CO2+H2             CO +H2O = CO2+H2
   EPI
Porsgrunn                                                          KÅ - Date: 2003-11-04 - Page: 4
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            H2 Membrane Reformer - Power Plant




   EPI
Porsgrunn                                KÅ - Date: 2003-11-04 - Page: 5