Thermodynamic analysis of plasma-assisted reforming of methane

Maşera, Kemal
Conventional techniques of syngas production use the exhaust gas of combustion of fossil fuels or feedstock like biomass itself. High temperatures are required for this process. To achieve necessary high temperatures, about 30% of feedstock is used initially. Another disadvantage of these conventional techniques is the tar formation which can damage the system by blocking the equipment. On the other hand, plasma processes are more efficient techniques to convert energy like solar, electrical, etc. into chemical energy by breaking the bonds of feedstock. Since the plasma processes do not need to increase the temperature of the feedstock, syngas can be produced from any gas (natural gas, biogas, etc.) that contains methane. In addition, produced syngas is free of toxic waste and reduced amount of pollutant gases such as CO2, NOx, SOx, etc. This study focuses on the system-level, thermodynamic modeling of the plasma-assisted reforming of methane. This analysis has three main important steps. First step is the comparison of conventional and plasma technologies for methane reforming. Second step is finding the theoretical limits in terms of efficiencies and production rates, as well as, figuring out the theoretical improvement capabilities of each individual system. The last step is suggesting the best system, among the studied ones, which has the maximum efficiency and productivity, besides obtaining the reaction quotient higher than the equilibrium constant. The main contribution of this study is comparison of plasma processes among themselves and with other conventional techniques through thermodynamic modeling. As results of the study suggest, plasma technologies have better energy efficiencies than conventional methods. Among themselves, although thermal plasma technologies have higher energy efficiency values, non-thermal plasma technologies exhibit greater specific energy values. In addition, non-thermal plasmas show better performance in the equilibrium constant analysis which represents they provides good ratio of products to reactants in terms of their mole fractions.


Development of anodes for direct oxidation of methane fuel in solid oxide fuel cells
Akdeniz, Yelda; Timurkutluk, Bora; Timurkutluk, Cigdem (2016-06-22)
In addition to pure hydrogen, solid oxide fuel cells (SOFCs) can utilize hydrocarbons as a fuel. However, conventional Ni-based anodes exhibit an excellent catalytic activity towards the hydrocarbon cracking reaction and thus the carbon deposition occurs in the anode. The deposited carbons quickly deactivate the anode irreversibly by covering the active surface of the anode catalyst. As a result, a significant degradation in the cell performance can be seen. In this study, the anode structure is modified by...
The impact of biofuel properties on emissions and performances of a micro gas turbine using combustion vibrations detection
Allouis, Christophe Gerard; Amoresano, A.; Capasso, R.; Langella, G.; Niola, V; Quaremba, G. (2018-10-01)
The use of pure vegetable oils in Micro Gas Turbine can damage the injection system or the combustion chamber causing undesired vibrations. An ideal solution would consist in having an available tool able to forecast and/or follow in real time the vibrational state of the combustion device. The present paper describes tests performed on a low emission Micro Gas Turbine for power generation, fueled with different liquid fuels, including commercial diesel oil and its blends with pure rapeseed oil. A particula...
Experimental investigation of oil accumulation in second land of internal combustion engines
İÇÖZ, TUNÇ; Dursunkaya, Zafer (ASME International, 2005-01-01)
Blowback of engine oil suspended in combustion gases, when the gas flows from the piston second land back into the combustion chamber is believed to contribute to oil consumption and hydrocarbon emissions in internal combustion engines. Oil accumulation in the region between top and second compression rings is a factor that influences this phenomenon. The effects of individual parameters, such as oil film thickness and viscosity, however have still not been understood. The present study was aimed at constru...
Seismic velocity characterisation and survey design to assess CO2 injection performance at Kizildere geothermal field
Parlaktuna, Mahmut; Parlaktuna, Burak; Sınayuç, Çağlar; Senturk, Erdinc; Tonguc, Erinc; Demircioglu, Oncu; Poletto, Flavio; Bohm, Gualtiero; Bellezza, Cinzia; Farina, Biancamaria (2021-08-01)
The noncondensable gases in most geothermal resources include CO2 and smaller amounts of other gases. Currently, the worldwide geothermal power is a small sector within the energy industry, and CO2 emissions related to the utilisation of geothermal resources are consequently small. In some countries, however, such as Turkey and Iceland, geothermal energy production contributes significantly to their energy budget, and their CO2 emissions are relatively significant. SUCCEED is a targeted innovation and resea...
The biocatalytic effect of Halobacterium halobium on photoelectrochemical hydrogen production
Sediroglu, V; Eroglu, I; Yucel, M; Turker, L; Gündüz, Ufuk (1999-04-30)
Hydrogen gas can be produced electrochemically by leading a current through two electrodes immersed in a NaCl solution. Bacteriorhodopsin (BR) a protein found in the purple membrane of Halobacterium halobium, is known to pump protons across the membrane upon illumination. In this study, the effect of BR on photoelectrochemical hydrogen production was investigated. A batch type bio-photoelectrochemical reactor was designed and constructed. The photoelectrochemical hydrogen production experiments were perform...
Citation Formats
K. Maşera, “Thermodynamic analysis of plasma-assisted reforming of methane,” Ph.D. - Doctoral Program, Middle East Technical University, 2016.