Plasma Enhancement Gases (PEGs), i.e. N₂ and noble gases, are used to mitigate the heat load over plasma facing components. Therefore, in DEMO, the tokamak exhaust stream will contain a certain amount of these PEGs which require a dedicated purification and separation unit. In the last years, PEG separation using microporous ceramic membranes has been studied at ENEA Frascati laboratories in the framework of the EUROfusion programme. The experiments conducted with a binary gas mixture have revealed the poor separation capability of the multi-channel membranes as a consequence of their high permeance.

In this activity, the behaviour of a commercial microporous single-channel membrane made of alpha alumina has been theoretically studied to evaluate its efficacy in separating H₂ from PEGs. The analysis has considered a total feed flow rate of 20 L min⁻¹ (at STP) having an equimolar composition of H₂ with one of the following species: PEG (Ar or N₂), D₂ or He. The separation capability has been evaluated by assuming the upstream pressure in the range 200−1000 kPa and keeping the downstream pressure at 100 kPa. Considering the values of the permeances assessed in our previous work for single gas tests, the membrane length needed to achieve a given target of separation has been evaluated as a function of the H₂ mole fraction in the retentate stream.

等离子体增强气体（PEG），即N ₂和稀有气体，用于减轻面对等离子体的组件的热负荷。因此，在DEMO中，托卡马克废气流将包含一定量的这些PEG，需要专用的纯化和分离装置。近年来，ENEUR Frascati实验室在EUROfusion计划的框架内研究了使用微孔陶瓷膜进行PEG分离的方法。用二元气体混合物进行的实验表明，由于其高渗透性，多通道膜的分离能力很差。

在此活动中，已对理论上由α氧化铝制成的商用微孔单通道膜的行为进行了研究，以评估其从PEG分离H _2的功效。分析已经考虑到总进料流速为20 L min ^-1（在STP时），具有等摩尔组成的H ₂和以下物质之一：PEG（Ar或N ₂），D ₂或He。通过假设上游压力在200-1000 kPa范围内，并将下游压力保持在100 kPa来评估分离能力。考虑到我们以前的工作中对单一气体测试评估的渗透率值，已将达到给定分离目标所需的膜长度作为H的函数进行了评估在渗余物流中为₂摩尔分数。