As the demand for green energy with high efficiency and low carbon dioxide (CO₂) emissions has increased, solid oxide fuel cells (SOFCs) have been intensively developed in recent years. Integrated gasification fuel cells (IGFCs) in particular show potential for large-scale power generation to further increase system efficiency. Thus, for commercial application of IGFCs, it is important to design reliable multi-stacks for large systems that show long-term stability and practical fuel gas for application to industrial equipment. In this work, a test rig (of a 5 kW SOFC system, with syngas from industrial gasifiers as fuel) was fabricated and subjected to long-term tests under high fuel utilization to investigate its performance. The maximum steady output power of the system was 5700 W using hydrogen and 5660 W using syngas and the maximum steady electrical efficiency was 61.24% while the fuel utilization efficiency was 89.25%. The test lasted for more than 500 h as the fuel utilization efficiency was larger than 83%. The performances of each stack tower were almost identical at both the initial stage and after long-term operation. After 500 h operation, the performances of the stack towers decreased only slightly under lower current and showed almost no change under high current. These results demonstrate the reliability of the multi-stack design and the prospect of this SOFC power-generation system for further enlarging its application in a MW_th demonstration.

作为对高效，低二氧化碳（CO ₂）排放增加了，近年来固体氧化物燃料电池（SOFC）的开发得到了大力发展。集成气化燃料电池（IGFC）特别显示出大规模发电的潜力，可以进一步提高系统效率。因此，对于IGFC的商业应用，重要的是为大型系统设计可靠的多电池堆，这些系统应具有长期稳定性，并为工业设备提供实用的燃气。在这项工作中，制造了一个试验台（5 kW SOFC系统，使用来自工业气化炉的合成气作为燃料），并在高燃料利用率下进行了长期测试，以研究其性能。该系统的最大稳定输出功率为：使用氢气的5700 W和使用合成气的5660 W，最大稳定电效率为61.24％，而燃料利用效率为89.25％。由于燃料利用效率大于83％，该测试持续了500多个小时。在初始阶段和长期运行之后，每个烟囱塔的性能几乎相同。在运行500小时后，堆塔的性能在较低电流下仅略有下降，而在高电流下几乎没有变化。这些结果证明了多燃料电池堆设计的可靠性，以及该SOFC发电系统在进一步扩大其在兆瓦中应用方面的前景 在较低电流下，烟囱塔的性能仅略有下降，而在较高电流下，烟囱的性能几乎没有变化。这些结果证明了多燃料电池堆设计的可靠性，以及该SOFC发电系统在进一步扩大其在兆瓦中应用方面的前景 在较低电流下，烟囱塔的性能仅略有下降，而在较高电流下，烟囱的性能几乎没有变化。这些结果证明了多燃料电池堆设计的可靠性，以及该SOFC发电系统在进一步扩大其在兆瓦中应用方面的前景_个示范。