Abstract Sorption enhanced–chemical looping steam methane reforming is a promising process for hydrogen production. In this process, the reformer contains, in addition to a solid CO2 sorbent, an oxygen transfer material (OTM). Ιn–situ CO2 capture by the sorbent shifts the overall reaction to the products' side, leading to high purity H2 production in a single step. The saturated sorbent is then regenerated in a second reactor at higher temperatures. The OTM is simultaneously reoxidized, generating significant amount of heat which is in–situ used for sorbent's regeneration. In this work, the optimization of heat coupling during the regeneration step of the intensified process was studied experimentally using a NiO/ZrO2 OTM–reforming catalyst, mechanically mixed with a CaZrO3–promoted CaO sorbent. The effect of two key operating parameters during regeneration was considered: the residence time of the feed stream and the type of oxidant (air, pure O2). Higher space velocities increased the percentage of CaCO3 decomposition without external heat supply. The use of pure O2 can provide in situ 47% of the heat requirements of the sorbent's regeneration, a value which is very close to the theoretical degree of autothermicity under the investigated conditions (57%), while producing a pure, ready for sequestration CO2 stream.

中文翻译：

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吸附增强-化学循环蒸汽甲烷重整：优化固定床反应器中再生的热耦合

摘要 吸附增强化学循环蒸汽甲烷重整是一种很有前景的制氢工艺。在此过程中，重整器除了包含固体 CO2 吸附剂外，还包含氧气转移材料 (OTM)。吸附剂的原位 CO2 捕获将整个反应转移到产品一侧，从而在一个步骤中产生高纯度的 H2。然后在较高温度下在第二反应器中再生饱和吸附剂。OTM 同时被再氧化，产生大量热量，这些热量就地用于吸附剂的再生。在这项工作中，使用 NiO/ZrO2 OTM 重整催化剂与 CaZrO3 促进的 CaO 吸附剂机械混合，通过实验研究了强化过程再生步骤中热耦合的优化。考虑了再生过程中两个关键操作参数的影响：进料流的停留时间和氧化剂的类型（空气、纯 O2）。在没有外部供热的情况下，较高的空间速度增加了 CaCO3 分解的百分比。使用纯 O2 可以原位提供吸附剂再生所需热量的 47%，该值非常接近研究条件下的自热理论程度 (57%)，同时产生纯的、可用于封存的 CO2溪流。