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Solid oxide fuel cell (SOFC) is a promising energy conversion device. It has the advantages of non-pollution, high energy utilization rate, and good fuel adaptability. However, SOFC often needs to be operated under variable load conditions, which leads to the problems of shorten service life and performance degradation. The study of the relationship between the variable load characteristics of SOFC and its operating conditions is helpful to improve the output performance of the stack, extend its service life, and formulate a reasonable control strategy. A 100 W SOFC short stack testing system was developed to experimentally investigate the variable load characteristics of the SOFC stack under multiple operating conditions. The results show that, increasing the operating temperature can reduce the ohmic resistance and total polarization resistance of the fuel cell stack, thereby enhancing the stack’s steady-state output performance and dynamic response performance. Increasing the hydrogen flow rate in the medium to high current range can reduce the concentration polarization resistance, thereby effectively enhancing the stack’s peak output performance and dynamic response performance. Increasing the air flow rate has a smaller effect on the performance improvement of the stack. Under the constant flow utilization strategy, the response voltage immediately falls within the range of ±5% of the final voltage. By varying the load with constant voltage, the response current can smoothly reach a stable value. Compared with the constant flow strategy and constant current load variation method, the stack shows better dynamic response performance under the constant flow utilization strategy and constant voltage load variation method.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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