Catalytic membrane reactor for tritium extraction system from He purge
Catalytic membrane reactor for tritium extraction system from He purge
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DOI：
10.1016/j.fusengdes.2016.02.028
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发表时间：
2016-11-01
影响因子：
1.7
通讯作者：
Tosti, Silvano
中科院分区：
文献类型：
--
作者：
Santucci, Alessia;Incelli, Marco;Tosti, Silvano
在氦冷却卵石床（HCPB）包层概念中，产生的氚是在低压下用氦净化增殖反应堆回收的，因此可以预见氚提取系统（TES）将从氦气净化中分离出产生的氚（其中含有水等杂质）。一些研发活动正在并行进行，以实验确定最有前途的TES技术：特别是基于pd的膜反应器（MR），由于其高氢选择性、连续操作能力、可靠性和紧凑性，正在进行研究。计划于明年在DEMO相关条件下（目前预计He吹扫速率约为10,000 Nm(3)/h， h -2/He比为0.1%）建造和运行中型MR，而目前正在进行小型反应器的初步实验，以确定最合适的操作条件和催化剂材料。这项工作介绍了在pd基膜上进行的实验活动的结果，旨在测量该装置从氦中分离氢的能力。通过考虑不同的He/H-2进料流量比、不同的流明压力和反应器温度，研究了许多操作条件。此外，采用商业（镍基）催化剂，测量了膜反应器（由壁厚约113 μ m，长500 mm，直径10 mm的钯银管组成）处理吹扫气体中所含水的性能。研究了两种不同的反应：同位素淹没和水气转移。在水煤气变换反应中，甲烷的存在表明需要具有较高选择性的催化剂。(c) 2016年欧洲原子能机构。Elsevier B.V.版权所有。
In the Helium Cooled Pebble Bed (HCPB) blanket concept, the produced tritium is recovered purging the breeder with helium at low pressure, thus a tritium extraction system (TES) is foreseen to separate the produced tritium (which contains impurities like water) from the helium gas purge. Several R&D activities are running in parallel to experimentally identify most promising TES technologies: particularly, Pd-based membrane reactors (MR) are under investigation because of their large hydrogen selectivity, continuous operation capability, reliability and compactness.The construction and operation under DEMO relevant conditions (that presently foresee a He purge flow rate of about 10,000 Nm(3)/h and a H-2/He ratio of 0.1%) of a medium scale MR is scheduled for next year, while presently preliminary experiments on-a small scale reactor are performed to identify most suitable operative conditions and catalyst materials.This work presents the results of an experimental campaign carried out on a Pd-based membrane aimed at measuring the capability of this device in separating hydrogen from the helium. Many operative conditions have been investigated by considering different He/H-2 feed flow ratios, several lumen pressures and reactor temperatures. Moreover, the performances of a membrane reactor (composed of a Pd-Ag tube having a wall thickness of about 113 mu m, length 500 mm and diameter 10 mm) in processing the water contained in the purge gas have been measured by using a commercial (Ni-based) catalyst. Two different reactions have been investigated: isotopic swamping and water gas shift. The presence of methane among of the water gas shift reaction indicates that a catalyst with higher selectivity is required. (C) 2016 EURATOM. Published by Elsevier B.V. All rights reserved.