مقايسه ي عملكرد راكتورهاي غشايي انتخاب پذير نسبت به هيدروژن و دي-اكسيدكربن براي توليد هيدروژن توسط فرآيند ريفرمينگ متانول با بخارآب : مدلسازي

Comparison of the Performance of H2- an‎d CO2-Permselec‎tive Membrane Reactors for Hydrogen Production via Methanol Steam Reforming: Modeling

مهندسي شيمي

The aim of this thesis is to investigate the methanol steam reforming process for hydrogen production in three types of reactors: a conventional reactor an‎d two membrane reactors selec‎tive toward hydrogen an‎d carbon dioxide. A palladium–silver membrane is employed for hydrogen separation, while a dual-phase carbonate membrane is used for carbon dioxide separation. To this end, a one-dimensional, non-isothermal mathematical model was developed, incorporating mass an‎d energy balance equations, reaction kinetics, an‎d membrane transport. The model was validated using available experimental data, an‎d the effects of key operating parameters—including temperature, pressure, flow rate, an‎d feed ratio—were subsequently analyzed. The results show that the simultaneous integration of reaction an‎d separation in membrane reactors increases hydrogen yield, reduces carbon monoxide concentration, an‎d improves hydrogen purity. Due to Le Chatelier’s principle, membrane reactors exhibit higher methanol conversion an‎d hydrogen yield, along with lower carbon monoxide concentrations compared to the conventional reactor. The palladium–silver membrane reactor, with an 84% recovery, demonstrates superior methanol conversion an‎d hydrogen production relative to the dual-phase ceramic–carbonate membrane reactor, which achieves a 71% recovery. According to the results, the hydrogen production yield is 86% in the conventional reactor, 92.5% in the dual-phase carbonate membrane reactor, an‎d 98.5% in the palladium–silver membrane reactor. Each membrane reactor offers unique advantages in improving the performance of methanol reforming an‎d reducing the need for downstream separation units. These findings can provide a foundation for developing advanced energy technologies an‎d reducing environmental pollutants.

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