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Research of SOFC Performance Feeded with CH4 and Experience of Changing Characteristic over Anode

Author: LuZuo
Tutor: YouHongXin
School: Dalian University of Technology
Course: Safety Technology and Engineering
Keywords: Solid oxide fuel cell direct oxidation of CH4 CO2 reforming of CH4 carbon deposition nickel/alkaline earth and rare earth metal oxide anode
CLC: TM911.4
Type: Master's thesis
Year: 2006
Downloads: 176
Quote: 1
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Abstract


Solid oxide fuel cell （SOFC） is an all solid-state energy conversion device operated at high temperatures with the advantage of high efficiency, little pollution and no expensive metal catalyzer. SOFC attracts more and more attention allover the world for lack of power resources and environmental pollution. However, there are many problems to be solved such as carbon deposition on anode when feeded with CH4.Combining the status and trend of R&D in the field of SOFC and the conditions in our laboratory, we make this paper consist of several parts as following: the studies of SOFC which feed in CH4 and the researches of carbon dioxide reforming of methane over nickel/alkaline earth metal oxide as anode materials, the main work and conclusions of this paper are as follows:（1） Tested the output performance of SOFC which feed in CH4 in different conditions. Generally speaking, the performance of SOFC increases with the rise of temperature and pressure. The dilution helium was causing a significant change in the reaction mechanism, from partial oxidation to complete oxidation with higher output performance. The output performance of SOFC increase to the top and then fall as the concentration of carrier gas increased. 85% is the feasible point with the highest power output. Compared with N2, He is a better carrier.（2）Study the CO2 reforming of CH4 by detecting the component of outlet gas with GC on-line to analyst the possible reaction over anode and find the reason of carbon deposition. According to the rise of ratio of CO2/CH4, the output performance of SOFC increases to the top and then fall. It is known that the curve of carbon formation has a turning point whose value is CO2/CH4=1.67.At this point, carbon deposition is restrained. The effects of deposition on catalysis activation are unreversible. Though CO2 can restrain carbon deposition, it could not remove all the carbon.（3） According to the researches of CO2 reforming of CH4 over nickel/alkaline earth and rare earth metal oxide as anode materials, the conclusions are obtained as following: The performance of Ni+YSZ cell has slightly down when mixed with CaO. However, the result of its running report shows that CaO is still an available promoter. Ni+CeO2 cell, which carbon deposition is restrained, has better catalyst activity, lower interface impedance and best outputperformance;Ni+MgO cell can run in a long time without deterioration, so it is considered to be one of the best promoter of restraining carbon deposition.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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