Optimizing the porosity configuration of porous copper fiber sintered felt for methanol steam reforming micro-reactor based on flow distribution
Optimizing the porosity configuration of porous copper fiber sintered felt for methanol steam reforming micro-reactor based on flow distribution
复制标题
基于流量分布优化甲醇蒸汽重整微反应器用多孔铜纤维烧结毡孔隙结构
DOI：
10.1016/j.apenergy.2018.02.102
复制
发表时间：
2018
期刊：
影响因子：
11.2
通讯作者：
Hu Guang-Hua
中科院分区：
文献类型：
--
作者：
Wang Qing-Hui;Yang Song;Zhou Wei;Li Jing-Rong;Xu Zhi-Jia;Ke Yu-Zhi;Yu Wei;Hu Guang-Hua
微反应器内的甲醇蒸汽重整被认为是车载燃料电池供氢的有效方法之一。多孔铜纤维烧结毡（PCFSF）是近年来发展起来的一种新型微反应器催化剂载体。然而，由于其随机结构，缺乏控制其孔隙结构的方法。提出了一种两步优化方法来优化 PCFSF 的孔隙率配置。首先，根据宏观数值分析获得的最佳流动分布对PCFSF的拓扑结构进行优化，并通过多步模压和固相烧结方法制备了两种具有12种孔隙率分布的PCFSF。其次，通过研究不同气时空速（GHSV）和反应温度下的反应特性，优化了半优化PCFSF的孔隙率分布。结果表明，孔隙率沿左右方向分布的PCFSF（PCFSF-LRs）比孔隙率沿上下方向分布的PCFSF（PCFSF-UUs）表现出更好的反应性能。在大多数情况下，无论 GHSV 和反应温度如何变化，孔隙率分布为 0.7-0.9-0.8 和 0.8-0.9-0.7 的 PCFSF-LR 的甲醇转化率和氢气流量均保持在较高水平（分别高于 92% 和 0.59mol/h）。 PCFSF-LR 的 H2 选择性为 0.7-0.9-0.8，在大 GHSV 和所有测试的反应温度下是最高的。所证明的抵消甚至逆转 GHSV 和温度对甲醇蒸汽重整性能的传统影响的效果可能归因于两个 PCFSF-LR 中更均匀的流量分布。
Methanol steam reforming inside micro-reactors is considered as one of the effective approaches for on-board supplying hydrogen for fuel cells. Porous copper fiber sintered felts (PCFSFs) are a new kind of catalyst support for micro-reactors developed in recent years. However, there is a lack of approach to control their porosity configurations due to their random structure. A two-step optimization method was proposed to optimize the PCFSFs’ porosity configuration. Firstly, the topology structures of PCFSFs were optimized based on the best flow distributions obtained from macroscopic numerical analyses, and two kinds of PCFSFs with twelve porosity distributions were fabricated through the multi-step mold pressing and solid-phase sintering method. Secondly, the porosity distributions of the semi-optimized PCFSFs were optimized by investigating their reaction characteristics under different gas hourly space velocities (GHSVs) and reaction temperatures. The results indicated that PCFSFs with porosity distribution along the Left-Right direction (PCFSF-LRs) exhibited better reaction performance than PCFSFs with porosity distribution along the Upside-Underside direction (PCFSF-UUs). The methanol conversion and H2flow rate for the PCFSF-LRs with porosity distribution of 0.7–0.9–0.8 and 0.8–0.9–0.7 kept on a high level (above 92% and 0.59 mol/h, respectively), regardless of the change of GHSVs and reaction temperatures in most cases. The H2selectivity of the PCFSF-LR of 0.7–0.9–0.8 was the highest under large GHSVs and all tested reaction temperatures. The demonstrated effect of counteracting, even reversing the conventional influence of the GHSV and temperature on the performance of methanol steam reforming may be attributed to the more uniform flow distribution in the two PCFSF-LRs.