The ability to store effectively excess of electrical energy from peaks of production is key to the development of renewable energies. Power-To-Gas, and specifically Power-To-Methane represents one of the most promising option. This works presents an innovative process layout that integrates Chemical Looping Combustion of solid fuels and a Power-to-Methane system. The core of the proposed layout is a multiple interconnected fluidized bed system (MFB) equipped with a two-stage fuel reactor (t-FR). Performances of the system were evaluated by considering a coal as fuel and CuO supported on zirconia as oxygen carrier. A kinetic scheme comprising both heterogeneous and homogeneous reactions occurring in the MFB was considered. The methanation unit was modelled developing a thermodynamic calculation method based on minimization of the free Gibbs energy. The performance of the system was evaluated by considering that the CO/CO₂ stream coming from the t-FR reacts over Ni supported on alumina catalyst with a pure H₂ stream generated by an array of electrolysis cells. The number of cells to be stacked in the array was evaluated by considering that a constant H₂ production able to convert the whole CO/CO₂ stream produced by the CLC process should be attained. The environmental performance of the proposed process was quantified using the Life Cycle Assessment (LCA) methodology. The analysis shows i) that the majority originate from the production and disposal of the oxygen carrier used in the t-FR, and ii) that reusing part of the oxygen produced by the electrolysis cells improves significantly the environmental performance of the proposed process.

有效地存储生产高峰期多余电能的能力是开发可再生能源的关键。沼气发电，特别是沼气发电是最有前途的选择之一。这项工作提出了一种创新的工艺布局，该工艺布局整合了固体燃料的化学循环燃烧和动力制甲烷系统。拟议布局的核心是配备两级燃料反应堆（t-FR）的多重互连流化床系统（MFB）。该系统的性能通过考虑以煤为燃料和以氧化锆为载体的CuO作为氧气载体进行评估。考虑了包括在MFB中发生的异构反应和均相反应的动力学方案。对甲烷化单元进行建模，以开发基于最小吉布斯能量最小化的热力学计算方法。来自t-FR的_2个物流在氧化铝催化剂上负载的Ni与由一系列电解槽生成的纯H ₂物流反应。考虑到应该获得恒定的H ₂产生量，该H ₂产生量能够转化通过CLC工艺产生的整个CO / CO ₂流，从而评估了阵列中要堆叠的电池数量。拟议过程的环境绩效使用生命周期评估（LCA）方法进行了量化。分析显示：i）大部分源自t-FR中使用的氧气载体的生产和处置，ii）电解槽产生的部分氧气的再利用显着改善了所提出方法的环境性能。