Our work reports the
two kind of experiment. The aim of these experiments was to test IP-SOFC,
this tube is screen printed with anode (Ni/YSZ based), cathode (LSM-based),
and electrolyte (YSZ) at various mixture fuels (Hydrogen and Methane) and the
details of these experiments is following below:
First experiment: The tube was operated under four fuel mixtures (H2
and CH4) at 900oC to investigate its degradation
behavior where methane content varied from 5%, to 20% with the remainder
being hydrogen. Initial IV curve for pure hydrogen was taken as a reference
and then the IV curves were recorded for each fuel mixture run.
Second experiment: the tube was fed with mixture fuel (95% Hydrogen-5% Methane
and 80% Hydrogen-20% Methane) as fuel at a flow rate of 1.5 L per min. Then
steady operation at 1 A commenced for 48 hours followed by the load
being decreased to 0A. This processe (current load cycles) was repeated 7
times. The IV curves were recorded for every current load cycle in order to
assess the performance (degradation) of the tube.
The results have shown
that the open circuit voltage increases with increasing the amount of methane
in fuel mixture. However, the repetition operation with a fuel mixture (H2
and CH4) affected the performance of tube in the expected manner.
This is likely to be predominantly a direct consequence of the alteration of
the anode, because of carbon deposition on its surface, leading to
deactivation of catalysis. In durability experiment, testing was conducted at
900oC with a constant load of 1 A, using two different fuel mixtures of
hydrogen and methane. When using 95% H2 and 5% CH4, the
tube voltage degradation rate was 5% per 1000 hours, whereas when using
80% hydrogen and 20% methane, the voltage degradation rate was significantly
higher, compared with previous work.
This result shows that
the performance of IP-SOFC improves with increased the methane amount but
there was sensitivity when operated long-term test. It can seem that there
was the influence of fuel composition on the longevity, potential carbon
clogging and other aspects of tube behavior over extended period of
operation. Further work to investigate this in detail is ongoing.