Kim Changhyun, Gong Myungkeun, Lee Jaewon, Na Youngseung
Department of Mechanical and Information Engineering, University of Seoul, Seoul 02504, Republic of Korea.
Membranes (Basel). 2022 Dec 1;12(12):1214. doi: 10.3390/membranes12121214.
With the increased usage of hydrocarbon-based fossil fuels, air pollution and global warming have accelerated. To solve this problem, renewable energy, such as hydrogen technology, has gained global attention. Hydrogen has a low volumetric density and thus requires compression technologies at high pressures to reduce storage and transportation costs. Techniques for compressing hydrogen include using mechanical and electrochemical hydrogen compressors. Mechanical compressors require higher specific energy consumption than electrochemical hydrogen compressors. Here, we used an electrochemical hydrogen compressor as a pseudo-two-dimensional model focused on electroosmotic drag, water back-diffusion, and hydrogen crossover flux at various temperatures, polymer electrolyte membrane thicknesses, and relative humidity conditions. To date, there have been few studies based on various operating conditions to find the optimal conditions. This study was conducted to determine the optimal parameters under various operating conditions. A numerical analysis demonstrated that the specific energy consumption was low in a specific current density section when the temperature was decreased. At the above-mentioned current density, the specific energy consumption decreased as the temperature increased. The polymer electrolyte membrane thickness yielded similar results. However, according to the relative humidity, it was confirmed that the higher the relative humidity, the lower the specific energy consumption in all of the current density sections. Therefore, when comparing temperatures of 30 °C and 80 °C at 145 A/m2, operating at 30 °C reduces the specific energy consumption by 12.12%. At 3000 A/m2 and 80 °C, the specific energy consumption is reduced by 11.7% compared to operating at 30 °C. Using N117 compared to N211 at 610 A/m2 for polymer electrolyte membranes can reduce specific energy consumption by 10.4%. Using N211 in the 1500 A/m2 condition reduces the specific energy demand by 9.6% compared to N117.
随着碳氢化合物基化石燃料使用量的增加，空气污染和全球变暖加速。为解决这一问题，氢能技术等可再生能源已受到全球关注。氢气的体积密度较低，因此需要高压压缩技术来降低储存和运输成本。氢气压缩技术包括使用机械和电化学氢气压缩机。机械压缩机比电化学氢气压缩机需要更高的比能耗。在此，我们使用电化学氢气压缩机作为伪二维模型，重点研究了在不同温度、聚合物电解质膜厚度和相对湿度条件下的电渗拖曳、水反向扩散和氢气渗透通量。迄今为止，基于各种运行条件寻找最佳条件的研究很少。本研究旨在确定各种运行条件下的最佳参数。数值分析表明，当温度降低时，在特定电流密度区间比能耗较低。在上述电流密度下，比能耗随温度升高而降低。聚合物电解质膜厚度也得出了类似结果。然而，根据相对湿度，证实所有电流密度区间内相对湿度越高，比能耗越低。因此，在145 A/m² 时比较30℃ 和80℃ 的温度，在30℃ 运行可将比能耗降低12.12%。在3000 A/m² 和80℃ 时，与在30℃ 运行相比，比能耗降低11.7%。对于聚合物电解质膜，在610 A/m² 时使用N117 相比N211 可将比能耗降低10.4%。在1500 A/m² 条件下使用N211 相比N117 可将比能量需求降低9.6%。
