نوع مقاله : مقاله پژوهشی
نویسندگان
1 02164543190
2 دانشکده مهندسی شیمی دانشگاه صنعتی امیرکبیر تهران ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Hydrogen as clean fuel is the main source of green energy and methane, the major part of natural gas, is the best candidate for hydrogen production due to the high H/C atomic ratio. Huge amount of carbon dioxide and need for separation unit in common hydrogen production processes have led researchers to pay more attention to direct conversion of methane to hydrogen. Plasma technology has led to low capital and operational costs due to no need to catalyst, no sensitivity to feed impurity, compactness, rapid start up and one step process. It has the potential of replacing current technologies. In this thesis, production of hydrogen gas from methane using an arc discharge plasma reactor has been investigated in which the effects of degree of non-equilibrium state and gas velocity on the methane conversion, hydrogen selectivity, and energy efficiency has been investigated by the designed reactors which provide a new prospects from the plasma chemistry process modeling point of view. The experimental results show that the proposed plasma reactor leads to improved energy efficiency compared to previous design and is competitive with other reactors studied by researchers in recent years. Methane conversion in the reactor with disk electrodes was 58%. The gas product is mainly hydrogen with the selectivity of more than 95%. A small percentage of ethane, ethylene and acetylene hydrocarbons are produced that is negligible. Solid carbon with particle size of 30-50 nm is deposited on the electrodes and the internal wall of the reactor, which is consisted of amorphous carbon and graphite-like structures. The macroscopic interpretation of the results shows that mass transfer plays an important role in methane conversion. Accordingly, an empirical correlation is presented for apparent kinetic reaction rate constant and its relation with flow rate.
کلیدواژهها [English]
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