整体煤气化固体氧化物燃料电池并网测试系统设计

Test design of integrated gasification solid oxide fuel cell(IG-SOFC)grid-connection technology

整体煤气化固体氧化物燃料电池(integrated gasification solid oxide fuel cellI,IG-SOFC)发电系统,利用煤气化合成气作为SOFC燃料,可以实现煤发电的近零排放,是一种非常有前景的清洁煤电技术,尤其契合我国以煤为主的资源秉性。提出一种IG-SOFC并网发电测试系统设计方案,搭建了可实现“并网测试模式”及“并网发电模式”实时切换的SOFC并网发电系统测试平台。基于自主研发的5 kW级SOFC堆塔模块,在煤制合成气作为燃料的条件下进行了实验测试,以验证系统设计方案的可行性和有效性。根据实验测试结果,SOFC堆塔发电功率达到4.5 kW时,并网功率为4.25 kW,堆塔电效率55.1%,发电系统电效率为52.0%,逆变效率约为94.5%。最后,通过“并网测试”模式下168 h长周期测试,验证了系统长周期运行的稳定性。

Integrated gasification solid oxide fuel cell(IG-SOFC)power generation system,which uses feed gas obtained from coal gasification(syngas)to achieve near-zero emissions,is a promising clean-coal power generation technology,especially given China's coal-based resource temperament.The paper firstly proposes a test design scheme of the IG-SOFC gridconnected power generation system.Then a SOFC grid-connected power generation test platform is built,which could be applied to the operation mode of both"grid-connected test mode"and"grid-connected power generation mode."The feasibility of the design plan is then validated using the experimental results of a self-developed 5 kW SOFC tower module with syngas as the feed gas.The results show that when the SOFC tower module's generation power reaches 4.5 kW,the grid-connected generation power is 4.25 kW,the power generation efficiency of the stack module is 55.1%,the power generation efficiency of the system is 52.0%,and the inversion efficiency is approximately 94.5%.Finally,the long-period performance stability of the system is verified by the 168 h long-cycle test under"grid-connected test mode."