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Nongnuch Rueangjitt Chalermrat Akarawitoo Sumaeth Chavadej 《Plasma Chemistry and Plasma Processing》2012,32(3):583-596
The aim of this research work was to evaluate the possibility of upgrading the simulated biogas (70?% CH4 and 30?% CO2) for hydrogen-rich syngas production using a multi-stage AC gliding arc system. The results showed that increasing stage number of plasma reactors, applied voltage and electrode gap distance enhanced both CH4 and CO2 conversions, in contrast with the increases in feed flow rate and input frequency. The gaseous products were mainly H2 and CO, with small amounts of C2H2, C2H4 and C2H6. The optimum conditions for hydrogen-rich syngas production using the four-stage AC gliding arc system were a feed flow rate of 150?cm3/min, an input frequency of 300?Hz, an applied voltage of 17?kV and an electrode gap distance of 6?mm. At the minimum power consumption (3.3?×?10?18?W?s/molecule of biogas converted and 2.8?×?10?18?W?s/molecule of syngas produced), CH4 and CO2 conversions were 21.5 and 5.7?%, respectively, H2 and CO selectivities were 57.1 and 14.9?%, respectively, and H2/CO (hydrogen-rich syngas) was 6.9. The combination of the plasma reforming and partial oxidation provided remarkable improvements to the overall process performance, especially in terms of reducing both the power consumption and the carbon formation on the electrode surface but the produced syngas had a much lower H2/CO ratio, depending on the oxygen/methane feed molar ratio. The best feed molar ratio of O2-to-CH4 ratio was found to be 0.3/1, providing the CH4 conversion of 81.4?%, CO2 conversion of 49.3?%, O2 conversion of 92.4?%, H2 selectivity of 49.5?%, CO selectivity of 49.96?%, and H2/CO of 1.6. 相似文献
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Nongnuch Rueangjitt Chalermrat Akarawitoo Thammanoon Sreethawong Sumaeth Chavadej 《Plasma Chemistry and Plasma Processing》2007,27(5):559-576
The objective of the present work was to study the reforming of simulated natural gas via the nonthermal plasma process with
the focus on the production of hydrogen and higher hydrocarbons. The reforming of simulated natural gas was conducted in an
alternating current (AC) gliding arc reactor under ambient conditions. The feed composition of the simulated natural gas contained
a CH4:C2H6:C3H8:CO2 molar ratio of 70:5:5:20. To investigate the effects of all gaseous hydrocarbons and CO2 present in the natural gas, the plasma reactor was operated with different feed compositions: pure CH4, CH4/He, CH4/C2H6/He, CH4/C2H6/C3H8/He and CH4/C2H6/C3H8/CO2. The results showed that the addition of gas components to the feed strongly influenced the reaction performance and the
plasma stability. In comparisons among all the studied feed systems, both hydrogen and C2 hydrocarbon yields were found to depend on the feed gas composition in the following order: CH4/C2H6/C3H8/CO2 > CH4/C2H6/C3H8/He > CH4/C2H6/He > CH4/He > CH4. The maximum yields of hydrogen and C2 products of approximately 35% and 42%, respectively, were achieved in the CH4/C2H6/C3H8/CO2 feed system. In terms of energy consumption for producing hydrogen, the feed system of the CH4/C2H6/C3H8/CO2 mixture required the lowest input energy, in the range of 3.58 × 10−18–4.14 × 10−18 W s (22.35–25.82 eV) per molecule of produced hydrogen. 相似文献
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