Bock Sebastian, Zacharias Robert, Hacker Viktor
Graz University of Technology, Institute of Chemical Engineering and Environmental Technology Inffeldgasse 25/C 8010 Graz Austria
RSC Adv. 2019 Jul 25;9(41):23686-23695. doi: 10.1039/c9ra03123e. eCollection 2019 Jul 29.
The utilization of locally available renewable resources is crucial for the creation of a sustainable energy system in the future. Biogas, a product of the anaerobic digestion of biogenic residues, exhibits great potential as feedstock to generate hydrogen for fuel cell mobility applications. A 10 kW fixed-bed chemical looping research system, to-date the largest in the world, was operated to prove the applicability of this versatile process for synthetic biogas utilization. In this experimental study, the focus was laid on examining the influence of different operating parameters (biogas composition, steam co-feeding, process temperature) on the attainable hydrogen purity and system efficiency. The generated hydrogen, between 90 to 230 g per cycle, was characterized online by ppm-range gas analysis and exhibited a product gas quality between 99.8% and 99.998%. The difference observed is attributed to carbon deposition if synthetic biogas with an increased share of carbon dioxide was supplied. This study involved the longest uninterrupted period of operation of a lab prototype system for fixed-bed chemical looping with 250 hours of time-on-stream, four months of discontinuous service and 50 consecutive experimental cycles.
利用当地可用的可再生资源对于未来创建可持续能源系统至关重要。沼气是生物源残留物厌氧消化的产物，作为为燃料电池移动应用生产氢气的原料具有巨大潜力。一个10千瓦的固定床化学循环研究系统，是迄今为止世界上最大的此类系统，已投入运行以证明这种通用工艺用于合成沼气利用的适用性。在这项实验研究中，重点在于考察不同操作参数（沼气组成、蒸汽共进料、工艺温度）对可达到的氢气纯度和系统效率的影响。每个循环产生的氢气量在90至230克之间，通过ppm级气体分析在线表征，产物气质量在99.8%至99.998%之间。观察到的差异归因于供应二氧化碳含量增加的合成沼气时的积碳现象。本研究涉及固定床化学循环实验室原型系统最长的不间断运行期，连续运行250小时，间断运行四个月，以及50个连续实验循环。
