随着“碳达峰、碳中和”战略的推进,氢能的重要性不断提升。在绿氢制备领域,碱性水电解(AWE)-质子交换膜水电解(PEM)复合制氢技术具有很好的应用前景,但是该技术的经济性以往较少受关注。平准化制氢成本(levelized cost of hydrogen,LC...随着“碳达峰、碳中和”战略的推进,氢能的重要性不断提升。在绿氢制备领域,碱性水电解(AWE)-质子交换膜水电解(PEM)复合制氢技术具有很好的应用前景,但是该技术的经济性以往较少受关注。平准化制氢成本(levelized cost of hydrogen,LCOH)是从全生命周期尺度量化水电解制氢经济性的指标。本工作首先建立了制氢系统LCOH模型,并对按4∶1配置AWE和PEM的10000 m3/h复合制氢系统进行了定量分析,最后开展了敏感性分析。结果表明,复合制氢系统LCOH为33.22元/kg,比纯AWE制氢系统高3.31元/kg,其中电费成本占到其全生命周期成本的53.32%。提高PEM比例可有效提高制氢系统对可再生能源波动性的适应程度,但是PEM配置比例对制氢成本的影响较明显。实际项目中应密切关注电解槽设备的成本变化,通过LCOH模型优化PEM配置比例。以33.22元/kg H2为参考目标水平,当PEM电解槽系统价格下降20%和40%时,PEM配置比例可分别提高至27.92%和46.25%。与常规水电解制氢系统类似的是,控制电价对提高复合制氢技术经济性非常关键,电价下降0.01元/kWh可带来制氢系统LCOH约0.45元/kg H2的降幅。对于当前的配置比例,在采购预算有限的前提下建议优先考虑提升AWE电解槽系统的制氢电耗指标。展开更多
Thin palladium composite membranes were prepared by modified electroless plating method on a-alumina supports and a dense Pd/α-Al2O3 composite membrane with high hydrogen flux, good selectivity for hydrogen was obtai...Thin palladium composite membranes were prepared by modified electroless plating method on a-alumina supports and a dense Pd/α-Al2O3 composite membrane with high hydrogen flux, good selectivity for hydrogen was obtained. It was tested in a single gas permeation system for hydrogen permeance and hydrogen selectivity over mtrogen. The hydrogen permeance of the corresponding membrane was ashigh as 2.45×10^-6mol·m^-2·s^-1.Pa^-1 and H2/N2 selectivityover700 at 623K and a pressure difference of 0.1MPa. The-main resistance of the composite membrane to H2 permeation lies in the aluminum ceramic support rather than the thin Pd layer.展开更多
Palladium membranes were prepared on an α-alumina support bymetal-organic compound chemical vapor deposition (MOCVD) method frompalladium (II) acetate precursor. Permeation properties of hydrogenand helium gas were s...Palladium membranes were prepared on an α-alumina support bymetal-organic compound chemical vapor deposition (MOCVD) method frompalladium (II) acetate precursor. Permeation properties of hydrogenand helium gas were studied as a function of the number of times ofdeposition of palladium on the peeling off phenomenon of palladium,which is common in electroless plated membrane, was observed. Silicawas introduced into the pores to prevent the palladium grain frompeeling off. The palladium-silica conjugated membrane does not showthe peeling off phenomenon and can withstand the high temperature upto 800 deg. C which is the upper limit of our apparatus.展开更多
基金Supported by the National Natural Science Foundation of China （No.20425619）.
文摘Thin palladium composite membranes were prepared by modified electroless plating method on a-alumina supports and a dense Pd/α-Al2O3 composite membrane with high hydrogen flux, good selectivity for hydrogen was obtained. It was tested in a single gas permeation system for hydrogen permeance and hydrogen selectivity over mtrogen. The hydrogen permeance of the corresponding membrane was ashigh as 2.45×10^-6mol·m^-2·s^-1.Pa^-1 and H2/N2 selectivityover700 at 623K and a pressure difference of 0.1MPa. The-main resistance of the composite membrane to H2 permeation lies in the aluminum ceramic support rather than the thin Pd layer.
文摘Palladium membranes were prepared on an α-alumina support bymetal-organic compound chemical vapor deposition (MOCVD) method frompalladium (II) acetate precursor. Permeation properties of hydrogenand helium gas were studied as a function of the number of times ofdeposition of palladium on the peeling off phenomenon of palladium,which is common in electroless plated membrane, was observed. Silicawas introduced into the pores to prevent the palladium grain frompeeling off. The palladium-silica conjugated membrane does not showthe peeling off phenomenon and can withstand the high temperature upto 800 deg. C which is the upper limit of our apparatus.
