Conclusions

(1) The use of pipeline gas of excess carbon dioxide content on the operation of an on-site fuel cell power plant may lower the energy conversion efficiency and reduce the maximum output power.

(2) In operating an on-site fuel cell power plant, it is crucial to monitor the opening of the steam ejector, as it may cause unscheduled shutdown of the power plant. In using fuels of marginal heating value, the rate of increase of output power should be limited to avoid automatic shutdown of the power plant due to full opening of the steam ejector, especially when the net output power is close to the rated capacity of 200 kW. In such cases, the opening of the steam ejector corresponding to the similar levels of the output power under steady state conditions can be used as a guide in determining the rate of increase of the net output power of the fuel cell power plant.

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