Syngas production via coal char-CO_2 fluidized bed gasification and the effect on the performance of LSCFN//LSGM//LSCFN solid oxide fuel cell  

作　　者：Hai-Bin Li Na Xu Yi-Hua Fang Hui Fan Ze Lei Min-Fang Han 

机构地区：[1]School of Chemical and Environmental Engineering, China University of Mining & Technology [2]State Key Laboratory of Power Systems, Department of Thermal Engineering, Tsinghua University

出　　处：《Journal of Materials Science & Technology》2018年第2期403-408,共6页材料科学技术（英文版）

基　　金：financially supported by the National Basic Research Program of China (Grant Nos. 2012CB215404, 2012CB215406);State Key Laboratory of Power Systems in Tsinghua University (No. SKLD15Z02, Fuel Cell Distributed Power Generation System);One-hundred Leading Talents Development Project for Progress on Science and Technology of Beijing (No. 041504130)

摘　　要：Fluidized bed reactor is widely used in coal char-CO2 gasification. In this work, the production of syngas by using a fluidized bed gasification technique was first investigated and then the effect of the produced syngas on the performance of the solid oxide fuel cell with a configuration of La0.4Sr0.6Co0.2 Fe0.7 Nb0.1O3-δ//La0.8Sr0.2Ga0.83Mg0.17O3-δ//La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ（LSCFN//LSGM//LSCFN） was studied. During the syngas production, we found that the volume fraction of CO increased with the increment of gasification temperature, and it reached a maximum value of 88.8%, corresponding to a composition of 0.76% H2, 88.8% CO, and 10.44% CO2, when the ratio of oxygen mass flow rate to that of coal char （Mo2/Mchar） increased to 0.29. In the following utilization of the produced syngas in solid oxide fuel cells, it was found that the increasing CO volume fraction in the syngas results in a gradual increase of the peak power density of the LSCFN//LSGM//LSCFN cell. The maximum peak power density of 410 mW/cm^2 was achieved for the syngas produced at 0.29 of Mo2/Mchar. In the stability test, the cell voltage decreased by 4% at a constant current density of 0.475 A/cm^2 after 54 h when fueled with the syngas with the composition of 0.76% H2, 88.8% CO, and 10.44% CO2. It reveals that a carbon deposition with the content of 13.66% in the anode is attributed to the cell performance degradation.Fluidized bed reactor is widely used in coal char-CO2 gasification. In this work, the production of syngas by using a fluidized bed gasification technique was first investigated and then the effect of the produced syngas on the performance of the solid oxide fuel cell with a configuration of La0.4Sr0.6Co0.2 Fe0.7 Nb0.1O3-δ//La0.8Sr0.2Ga0.83Mg0.17O3-δ//La0.4Sr0.6Co0.2Fe0.7Nb0.1O3-δ（LSCFN//LSGM//LSCFN） was studied. During the syngas production, we found that the volume fraction of CO increased with the increment of gasification temperature, and it reached a maximum value of 88.8%, corresponding to a composition of 0.76% H2, 88.8% CO, and 10.44% CO2, when the ratio of oxygen mass flow rate to that of coal char （Mo2/Mchar） increased to 0.29. In the following utilization of the produced syngas in solid oxide fuel cells, it was found that the increasing CO volume fraction in the syngas results in a gradual increase of the peak power density of the LSCFN//LSGM//LSCFN cell. The maximum peak power density of 410 mW/cm^2 was achieved for the syngas produced at 0.29 of Mo2/Mchar. In the stability test, the cell voltage decreased by 4% at a constant current density of 0.475 A/cm^2 after 54 h when fueled with the syngas with the composition of 0.76% H2, 88.8% CO, and 10.44% CO2. It reveals that a carbon deposition with the content of 13.66% in the anode is attributed to the cell performance degradation.

关 键 词：Fluidized bed gasification Syngas Solid oxide fuel cell （SOFC） La0.4Sr0.6Co0.2Fe0.7Nb0.01O3-δ （LSCFN] 

分 类 号：TM911.4[电气工程—电力电子与电力传动]