Combined methane reforming by carbon dioxide and steam in proton conducting solid oxide fuel cells for syngas/power co-generation

Methane and carbon dioxide mixture can be used as the fuel in a proton conducting solid oxide fuel cell (SOFC) for power/syngas co-generation and greenhouse gas reduction. However, carbon deposition and low conversion ratio are potential problems for this technology. Apart from using functional catalytic layer in the SOFC to enhance CH₄ dry reforming, adding H₂O into the fuel stream could facilitate the CH₄ conversion and enhance the co-generation performance of the SOFC. In this work, the effects of adding H₂O to the CO₂CH₄ fuel on the performance of a tubular proton conducting SOFC are studied numerically. Results show that the CH₄ conversion is improved from 0.830 to 0.898 after adding 20% H₂O to the anode. Meanwhile, the current density is increased from 2832 A m⁻² to 3064 A m⁻² at 0.7 V. Sensitivity studies indicate that the H₂:CO ratio can be effectively controlled by the amount of H₂O addition and the H₂ starvation can be alleviated, especially at high current density conditions.     

基于风味检测技术对四大名醋挥发性成分的研究进展

探究四大名醋独特的风味已成为研究的热点,而现代检测技术是确定挥发性成分的重要手段。文章从四大名醋酿造的原料、工艺过程以及风味物质的检测技术、多元统计分析手段等方面,全面地介绍了我国四大名醋挥发性成分的研究进展,说明了随着分析技术的不断更新对不同化学组分的区分和识别更加明确,旨在为食醋风味的研究提供一定理论基础。