A series of industrial-scale 316L stainless steel membrane tubes (Φ60 mm × 1000 mm) was fabricated by wet spray coating three membrane powders (20 μm; 12 μm; 4 μm) onto a pre-sintered 316L stainless steel support tube, followed by sintering. The influence of the membrane powder size and spray coating times or number of spray coating layers on the structure and permeability of the as-sintered membrane tubes was analyzed in detail. A permeability model has been formulated according to the resistance-in-series model based on Darcy’s law. It is shown that the model can reasonably describe the permeability of as-sintered stainless steel membranes. A good balance between the filtration accuracy and the permeability can be achieved by fabricating an ultra-thin metallic membrane structure on the surface of a pre-sintered stainless steel support tube. The gas separation efficiency of the as-fabricated 316L stainless steel membrane reached 99.8% for the 0.3-μm dust particles. The as-sintered porous 316L membrane (Φ60 mm × 1000 mm) was used to filter hot gas mixtures of CO and C4NiO4 in continuous industrial operations for 4 months and demonstrated outstanding performance.

中文翻译：

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工业规模不锈钢多孔膜管的制备及其应用

通过将三种膜粉末（20 μm；12 μm；4 μm）湿喷涂到预烧结的 316L 不锈钢支撑管上，然后将其制成一系列工业规模的 316L 不锈钢膜管（Φ60 mm × 1000 mm）。烧结。详细分析了膜粉粒径、喷涂次数或喷涂层数对烧结态膜管结构和渗透性的影响。根据基于达西定律的串联电阻模型建立了渗透率模型。结果表明，该模型可以合理地描述烧结态不锈钢膜的渗透性。通过在预烧结不锈钢支撑管表面制作超薄金属膜结构，可以实现过滤精度和渗透率的良好平衡。所制造的 316L 不锈钢膜的气体分离效率对于 0.3-μm 灰尘颗粒达到 99.8%。烧结态多孔 316L 膜（Φ60 mm × 1000 mm）在连续工业操作中用于过滤 CO 和 C4NiO4 的热气体混合物 4 个月，并表现出出色的性能。