Technical University of Munich, Chair of Urban Water Systems Engineering, Am Coulombwall 3, 85748 Garching, Germany.
Bavarian State Research Center for Agriculture, Central Department for Quality Assurance and Analytics, Lange Point 6, 85354 Freising, Germany.
Bioresour Technol. 2019 Oct;289:121735. doi: 10.1016/j.biortech.2019.121735. Epub 2019 Jul 3.
Increasing shares of energy production originating from fluctuating renewable sources require measures that are able to balance power production for a stable electricity grid. H/CO biomethanation is a suitable approach to convert fluctuating excess renewable energy into the storable substitute natural gas. This study investigated the rapid load change capability of an anaerobic thermophilic trickle bed reactor while maintaining a high methane content. The return to full load (62.1 m/m/d) after a 30-min operational off-cycle was possible almost immediately, while 24-h interruptions required a 60-min stepwise load increase. To accelerate this delayed microbial conversion activity, non-steady state substrate gas conversion can be controlled via substrate and product gas flow rates, allowing to reactivate the entire microbial community and produce high quality product gas. Reactor design might be further improved to avoid short-circuiting and use the entire trickle bed gas phase as high quality gas buffer during initial load increases.
随着越来越多的能源生产来自波动的可再生能源，需要采取措施来平衡电力网格的电力生产。H/CO 生物甲烷化是将波动的过剩可再生能源转化为可储存的替代天然气的一种合适方法。本研究考察了在保持高甲烷含量的情况下，厌氧嗜热滴流床反应器快速适应负荷变化的能力。在操作停机 30 分钟后，几乎可以立即恢复满负荷（62.1 m/m/d），而 24 小时的中断则需要逐步增加 60 分钟的负荷。为了加速这种延迟的微生物转化活性，可以通过基质和产物气体流速来控制非稳态基质气体转化，从而重新激活整个微生物群落并产生高质量的产物气体。反应器设计可以进一步改进，以避免短路，并在初始负荷增加期间使用整个滴流床气相作为高质量的气体缓冲。
