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Author: search.filters.author.Arpornwichanop, AmornchaiSubject: search.filters.subject.Response surface methodology

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    Performance analysis and optimization of a trigeneration process consisting of a proton-conducting solid oxide fuel cell and a LiBr absorption chiller
    (2023-02-28)
    Sornumpol, Ratikorn
    ;
    Arpornwichanop, Amornchai
    ;
    Patcharavorachot, Yaneeporn
    In this work, the trigeneration system, consisting of a proton-conducting solid oxide fuel cell (SOFC–H<sup>+</sup>) and a single-stage LiBr absorption chiller, was proposed. The SOFC–H<sup>+</sup> and single-stage LiBr absorption chiller models were developed through Aspen Plus V10. From the sensitivity analysis, the results show that increases in temperature and fuel utilization can improve the performance of the SOFC–H<sup>+</sup>. Conversely, the air to fuel (A/F) molar ratio and pressure negatively affect the electrical efficiency and overall system efficiency. In the case of the absorption chiller, the coefficient of performance was increased and made stable according to a constant value when the generator temperature was increased from 90 to 100 °C. When the optimization was performed, it was found that the SOFC–H<sup>+</sup> should be operated at 700 °C and 10 bar with fuel utilization of 0.8 and A/F molar ratio of 2 to achieve a maximum overall efficiency of 93.34%. For the energy and exergy analysis, a combined heat and power SOFC–H<sup>+</sup> was found to have the highest energy and exergy efficiencies, followed by the trigeneration process. This indicates that the integration of the SOFC–H<sup>+</sup> and LiBr absorption chiller is possible to efficiently produce electricity, heating and cooling.
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    Mass transfer resistance and response surface methodology for separation of platinum (IV) across hollow fiber supported liquid membrane
    (2016-10-25)
    Wongkaew, Krirkratthawit
    ;
    Wannachod, Thanaporn
    ;
    Mohdee, Vanee
    ;
    Pancharoen, Ura
    ;
    Arpornwichanop, Amornchai
    The separation of platinum (IV) from wastewater across hollow fiber supported liquid membrane was successful in reaching 96% extraction and 88% stripping using 10% (v/v) trioctylmethyl-ammonium chloride (Aliquat 336) as the extractant. The mass transfer resistances were (1/k<inf>a</inf>) 3.297 × 10<sup>4</sup> s/cm, (1/k<inf>m</inf>) 0.164 × 10<sup>4</sup> s/cm, (1/k<inf>o</inf>) 3.404 × 10<sup>4</sup> s/cm and (1/K) 6.865 × 10<sup>4</sup> s/cm. The system was governed by the mass transfer resistance from the liquid-membrane. Response surface methodology was used to qualify and estimate the influence of operating conditions. Predicted model with experimental data were in good agreement at a standard deviation of 1%.
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    Using a membrane reactor for the oxidative coupling of methane: Simulation and optimization
    (2014-01-01)
    Patcharavorachot, Yaneeporn
    ;
    Tiraset, Sirikarn
    ;
    Wiyaratn, Wisitsree
    ;
    Assabumrungrat, Suttichai
    ;
    Arpornwichanop, Amornchai
    An oxidative coupling of methane (OCM) is a promising process to convert methane into ethylene and ethane; however, it suffers from the relatively low selectivity and yield of ethylene at high methane conversion. In this study, a membrane reactor is applied to the OCM process in order to prevent the deep oxidation of a desirable ethylene product. The mathematical model of OCM process based on mass and energy balances coupled with detailed OCM kinetic model is employed to examine the performance of OCM membrane reactor in terms of CH<inf>4</inf> conversion, C<inf>2</inf> selectivity, and C<inf>2</inf> yield. The influences of key operating parameters (i.e., temperature, methane-to-oxygen feed ratio, and methane flow rate) on the OCM reactor performance are further analyzed. The simulation results indicate that the OCM membrane reactor operated at higher operating temperature and lower methane-to-oxygen feed ratio can improve C<inf>2</inf> production. An optimization of the OCM membrane reactor using a surface response methodology is proposed in this work to determine its optimal operating conditions. The central composite design is used to study the interaction of process variables (i.e., temperature, methane-to-oxygen feed ratio, and methane flow rate) and to find the optimum process operation to maximize the C<inf>2</inf> products yield.