CO₂ methanation tests were carried out in a demonstration scale fluidized bed reactor (400 kW_SNG capacity) to investigate its efficiency and flexibility towards operating conditions fluctuations associated with Power-to-Methane (PtM) production units. A wide range of operating conditions were explored: pressure (2–4 bara), reaction temperature (260−375 °C), H₂/CO₂ inlet ratio (1.5–4.8), heat released by the reaction exothermicity (13.4–32.7 kW_th), and U/U_mf (2.2–7.2). Whatever the operating conditions, this technology (reactor and catalyst) reached the maximum possible conversion, i.e. the thermodynamic equilibrium, in only one step. These excellent performances resulted from efficient management of methanation exothermicity (temperature gradient in the fluidized bed is lower than 20 °C) and optimized catalyst activity (even at low temperature: 280 °C). In addition to its high flexibility towards operating conditions, short stabilization time (<30 min) was required for the process to reach permanent and stable regime when the operating condition setpoints were changed. Simulations were performed to investigate different process chains efficiency for producing SNG (Substitute Natural Gas) compliant with natural gas grid standards. A process chain composed of the fluidized bed reactor studied in this article followed by a condensation step, a partial recirculation stream to the reactor inlet, and a polishing reactor was proved to be an interesting solution to produce high quality SNG with reduced equipment and compression cost. The present reactor together with the specific metal-based catalyst developed in this study appear as a very efficient and flexible solution for PtM application.

CO ₂甲烷化测试在示范规模的流化床反应器（400 kW _SNG容量）中进行，以研究其效率和灵活性，以应对与电制甲烷 (PtM) 生产装置相关的操作条件波动。探索了广泛的操作条件：压力 (2–4 bara)、反应温度 (260–375 °C)、H ₂ /CO ₂入口比 (1.5–4.8)、反应放热释放的热量 (13.4–32.7 kW _th ) 和 U/U _mf (2.2–7.2)。无论操作条件如何，该技术（反应器和催化剂）都达到了最大可能的转化率，即热力学平衡，只需一步。这些优异的性能源于对甲烷化放热的有效管理（流化床中的温度梯度低于 20 °C）和优化的催化剂活性（即使在低温：280 °C）。除了对操作条件的高度灵活性外，当操作条件设定值改变时，该过程需要较短的稳定时间（<30 分钟）才能达到永久和稳定的状态。进行了模拟以研究生产符合天然气电网标准的 SNG（替代天然气）的不同工艺链效率。由本文研究的流化床反应器组成的工艺链，然后是冷凝步骤，部分再循环流到反应器入口，事实证明，精制反应器是一种有趣的解决方案，可以降低设备和压缩成本，生产高质量的 SNG。本反应器与本研究中开发的特定金属基催化剂一起作为 PtM 应用的非常有效和灵活的解决方案。