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首页> 外文会议>AIChE Annual Meeting >A Modeling Study of CO{sub}2-selective Water-Gas-Shift Membrane Reactor for Fuel Cell
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A Modeling Study of CO{sub}2-selective Water-Gas-Shift Membrane Reactor for Fuel Cell

机译：Co {亚} 2选择性水 - 液移膜反应器的燃料电池建模研究

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Water gas shift (WGS) reaction is critical to hydrogen purification for fuel cells. Since the WGS reaction is reversible, the reaction is not efficient, resulting in a high concentration of unconverted CO (about 1%) in the H{sub}2 product and a bulky, heavy reactor. Using a CO{sub}2-selective membrane reactor shifts the reaction towards the product side, which enhances the conversion of CO and increases the purity of the H{sub}2 product at a high pressure. Also air can be used as the sweep gas to remove the permeate, CO{sub}2, on the low-pressure side of the membrane to have a high driving force for the separation. In this study, the reaction and transport process in the countercurrent WGS membrane reactor was simulated with a one-dimensional non-isothermal model using the recent experimental data of membrane selectivity and permeability, and the influences of several system parameters were investigated. In this modeling study, the synthesis gases with different CO concentrations from autothermal reforming of gasoline with air were used as the feed gas, while heated air was used as the sweep gas. The reaction rate equation for the Cu/ZnO catalyst from literature was incorporated into the model. The modeling results have shown that a CO concentration of less than 10 ppm, a H{sub}2 recovery of greater than 97%, and a H{sub}2 concentration of greater than 54% (on the dry basis) are achievable. As the CO{sub}2/H{sub}2 selectivity increased, the recovery of H{sub}2 increased, without affecting the membrane area requirement and the low CO attainment. Increasing sweep-to-feed flow rate ratio enhanced the permeation driving force but decreased the feed side temperature and thus the reaction rate, resulting in a net effect balanced between them. When an improved catalyst with higher activity was applied, the membrane area requirement reduced significantly. Higher membrane permeability also resulted in the reduction of the membrane area. These results have shown that both the reaction rate and the membrane permeability play an important role on the overall reactor behavior. In addition, it is expected with the advancement of the high temperature proton-exchange-membrane fuel cell (120-150°C) that the constraint for CO concentration can be relaxed to about 50 ppm in the near future. Therefore, the membrane area could be reduced significantly based on the modeling results.
机译：水煤气变换（WGS）反应对燃料电池的氢纯化至关重要。由于WGS反应是可逆的，反应不是有效的，因此H {Sub} 2产物和体积重的反应器中的高浓度的未转化CO（约1％）。使用CO {亚} 2选择性膜反应器将反应移向产物侧，这增强了CO的转化率并使H {亚} 2产品的纯度在高压下。此外，空气可以用作扫描气体以在膜的低压侧去除渗透物，CO {} 2，以具有用于分离的高驱动力。在该研究中，使用最近的膜选择性和渗透性的实验数据模拟了逆流WGS膜反应器中的反应和运输过程，研究了几个系统参数的影响。在该模型研究中，使用具有空气的汽油自动重整的不同CO浓度的合成气作为进料气体，同时使用加热的空气作为扫描气体。将文献中Cu / ZnO催化剂的反应速率方程掺入模型中。建模结果表明，少于10ppm的Co浓度，H {sub} 2恢复大于97％，并且可以实现大于54％的H {sub} 2浓度（在干基础上）。作为CO {SUB} 2 / H {SUB} 2选择性增加，H {SUB} 2的恢复增加，而不影响膜面积要求和低CO率。提高扫掠流量比率比增强渗透驱动力，但降低了进料侧温度，从而降低了反应速率，导致它们之间的净效应平衡。当施加较高活性的改进催化剂时，膜面积要求显着减少。更高的膜渗透性也导致膜面积的还原。这些结果表明，反应速率和膜渗透性均对整体反应器行为发挥着重要作用。此外，预计会增加高温质子 - 交换膜燃料电池（120-150°C），即在不久的将来，CO浓度的约束可以放宽至约50ppm。因此，膜面积可以基于建模结果显着降低。

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