Towards full-scale demonstration of hydrogen-selective membranes for CO2 capture: Inhibition effect of WGS-components on the H2 permeation through three Pd membranes of 44 cm long
Towards full-scale demonstration of hydrogen-selective membranes for CO2 capture: Inhibition effect of WGS-components on the H2 permeation through three Pd membranes of 44 cm long
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DOI：
10.1016/j.memsci.2010.07.029
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发表时间：
2010-11
影响因子：
9.5
通讯作者：
Hui Li;J. Dijkstra;J. Pieterse;J. Boon;R. Brink;D. Jansen
中科院分区：
文献类型：
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作者：
Hui Li;J. Dijkstra;J. Pieterse;J. Boon;R. Brink;D. Jansen
已经建立了一个工艺开发单元(PDU)来测试能力为8.5 Nm~3/h H_2产品的钯膜，超过了典型的实验室规模测试的数量级。在接近实际操作条件：673K，进料压力20-35bar(A)，进料流量30-90nL/min的条件下，考察了水-气变换组分(WGS)对3种平行构型的Pd膜对H_2渗透的抑制作用。与相同H2浓度的H2/N2混合气体相比，WGS组分的缓蚀作用使H2通量降低约20%，且随进料压力的增加而增大。CO和CO2对H_2渗透均有抑制作用。CO的缓蚀作用比等量的CO2强，但在WGS混合物中，CO2的缓蚀效果比CO强，因为CO2的用量高出4倍。在短期稳定性试验中，WGS-混合物的H_2通量在673K保持不变。传质对H_2渗透的影响很大，传质阻力随进料压力的变化不明显。
A Process Development Unit (PDU) has been built to test Pd membranes with a capacity of 8.5Nm3/h H2product, exceeding typical lab scale testing by orders of magnitude. The inhibition effect of water–gas shift (WGS) components on the H2permeation was investigated through three Pd membranes of 44cm long in parallel configuration with the WGS composition: 4.0% CO, 19.2% CO2, 15.4% H2O, 1.2% CH4and 60.1% H2representing the reformate gas from an oxygen-fed autothermal reformer followed by a shift reactor, at near practical operation conditions: 673K, 20–35bar(a) feed pressure and 30–90NL/min feed flow rate. The inhibition effect of WGS-components resulted in a H2flux decrease of around 20% compared to H2/N2mixtures with the same H2concentration, which increased with feed pressure. CO and CO2both had inhibitive effects on the H2permeation. CO was more inhibitive than same amount CO2but CO2showed a stronger inhibition effect than CO in the WGS-mixtures due to its 4 times higher amount. The H2flux of WGS-mixtures remained unchanged at 673K in short stability tests. The influence of mass transfer on the H2permeation was found to be significant and there was no apparent change in the mass transfer resistance with the variation of feed pressure.