Imorb, Karittha

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Imorb, Karittha
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Im-orb, Karittha
Im-Orb, Karittha
Im-orb, K.
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karittha.im@kmitl.ac.th

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    Item type:Publication,
    Design and evaluation of the sorption enhanced steam reforming and solid oxide fuel cell integrated system with anode exhaust gas recirculation for combined heat and power generation
    (2017-01-01)
    Wiranarongkorn, Kunlanan
    ;
    Im-Orb, Karittha
    ;
    Ponpesh, Pimporn
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    Solid oxide fuel cell (SOFC) is an electrochemical device for power generation with high efficiency and low environmental impact. Due to a high-temperature operation of SOFC, useful heat can be recovered to enhance its system efficiency. Regarding the environmental concern, bio-oil, the renewable liquid fuel, can be applied to SOFC system. In this study, the SOFC integrated with a steam reforming of bio-oil is considered. A sorption enhanced reforming process is studied for the production of high purity hydrogen for SOFC, and the anode gas recirculation in the SOFC system is proposed for the system improvement. Modeling of such an integrated process is performed using Aspen Plus simulator. As heat and power are generated from the SOFC system, the effect of key design parameters; fuel utilization and recirculation ratio of the anode gas, on a heatto-power ratio is analyzed. The system performance regarding to the electrical and thermal efficiencies is also evaluated. The results show that increasing the anode recirculation ratio increases the combined heat and power (CHP) performance, but increasing the fuel utilization decreases the thermal efficiency. It is also found that the appropriate range of heat-to-power ratio of the system varies from 0.24 to 0.89.
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    Flowsheet-based model and exergy analysis of solid oxide electrolysis cells for clean hydrogen production
    (2018-01-01)
    Im-orb, Karittha
    ;
    Visitdumrongkul, Nuttawut
    ;
    Saebea, Dang
    ;
    Patcharavorachot, Yaneeporn
    ;
    Arpornwichanop, Amornchai
    A solid oxide electrolysis cell (SOEC) is an electrochemical technology used for hydrogen production via a steam electrolysis reaction. Because the existing SOEC models are complicated, the aim of this study is to develop a user-friendly SOEC model in a flowsheet simulator (Aspen Plus). The developed model is used to perform a parametric analysis to investigate the effects of key process parameters, i.e., operating temperature, current density, steam concentration, sweep gas type and number of cells, on the SOEC performance. The simulation results show that the voltage and the overall overpotential decrease as the cell temperature increases, whereas the opposite trends are observed when the current density increases. From the energy and exergy analyses, the total energy demand slightly increases with cell temperature, whereas the electrical energy demand decreases. Based on an operating temperature of 1273 K when the SOEC uses oxygen as the sweep gas, the highest energy and exergetic efficiencies of 78.45% and 92.20% are achieved at a current density of 2500 A m<sup>−2</sup> and at a steam concentration of 90% in a 500-cell stack.