Influence of Nozzle Shape on Partial Oxidation Reforming of Biogas Using Microwave Plasma
Influence of Nozzle Shape on Partial Oxidation Reforming of Biogas Using Microwave Plasma
复制标题
喷嘴形状对微波等离子体沼气部分氧化重整的影响
DOI：
10.1021/acs.energyfuels.1c00028
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发表时间：
2021
期刊：
影响因子：
5.3
通讯作者：
and Ryo Tanaka
中科院分区：
文献类型：
--
作者：
Tsuyoshi Yamamoto;Shinya Uchiyama;Masahiro Kishida;and Ryo Tanaka
沼气是一种碳中性燃料，由约60%的CH4和约40%的CO2组成，但火焰稳定性差。因此，为了有效利用，必须增强燃烧反应或必须升级沼气。本文采用微波等离子体辅助燃烧技术对沼气进行部分氧化重整，以强化重整反应，提高沼气质量。采用四种不同的喷嘴，研究了沼气重整过程的特性以及喷嘴形状的影响。小而薄的喷嘴最大程度地抑制了微波衰减，从而最有效地促进了重整反应。微波等离子体不仅将CH 4重整为H2和CO，还将不具有任何发热量的CO2分解为具有发热量的CO，从而使小细喷嘴实现的最大冷煤气效率为112.7%，实现了沼气的升级。还评估了使用O2作为氧化剂的沼气重整以提高冷气效率，但是相对于使用空气和N2作为氧化剂的反应，在该反应中冷气效率不期望地降低，因为通过增加后者中的活性自由基如H和OH来增强重整反应。
Biogas, composed of ∼60% CH4and ∼40% CO2, is a carbon-neutral fuel but suffers from low flame stability. Thus, for effective utilization, the combustion reaction must be enhanced or biogas must be upgraded. Herein, microwave plasma-assisted combustion was utilized for partial oxidation reforming of biogas to enhance the reforming reaction and to upgrade biogas. The characteristics of the biogas reforming process and effects of the nozzle shape were investigated using four different nozzles. The small thin nozzle suppressed microwave attenuation to the greatest extent and thus most effectively promoted the reforming reaction. Microwave plasma not only reformed CH4into H2and CO but also decomposed CO2(which does not have any calorific value) into CO (which has calorific value); thus, the maximum cold gas efficiency achieved with the small thin nozzle was 112.7%, and the biogas was upgraded. Biogas reforming using O2as an oxidizer was also evaluated to improve the cold gas efficiency, but the cold gas efficiency undesirably decreased in this reaction relative to that using air with N2as the oxidizer because the reforming reactions are enhanced by increasing the active radicals like H and OH in the latter.