Abstract CO2 methanation, as a power-to-gas technology, is considered to be an important method to secure energy supply by utilizing CO2 and H2 gases. In this study, a 0.2 kW CH4 bench-scale fluidized bed reactor was used for CO2 methanation using approximately 13 kg nickel-based catalyst to investigate the effect of temperature, gas velocity, and H2/CO2 ratio on CO2 conversion, CH4 purity, and CH4 selectivity. Response surface methodology (RSM) was employed to design the experimental conditions to statistically evaluate the effect of operating variables. Reduced quadratic model equations for CO2 conversion and CH4 purity were derived, which determined the optimal conditions within the experimental conditions. The suggested conditions for the highest CO2 conversion were 297 °C, 4.66H2/CO2, and 4.0 Ug/Umf (velocity ratio), whereas different conditions were determined for the highest CH4 purity. Among the operating variables, temperature was the most influential factor, followed by the gas ratio. The highest CO2 conversion and CH4 purity were 98% and 81.6%, respectively. Additionally, the heat transfer coefficient (ho) was found to be 115 W/m2∙°C during a 10-h continuous CO2 methanation experiment, which is an important design factor for the further scale-up of the process.

中文翻译：

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使用镍基催化剂的实验室规模鼓泡流化床反应器中的 CO2 甲烷化及其放热传热分析

摘要 CO2甲烷化作为一种​​电转气技术，被认为是利用CO2和H2气体保障能源供应的重要方法。在本研究中，使用约 13 kg 镍基催化剂的 0.2 kW CH4 台式流化床反应器用于 CO2 甲烷化，以研究温度、气速和 H2/CO2 比对 CO2 转化率、CH4 纯度和CH4 选择性。响应面方法 (RSM) 用于设计实验条件，以统计评估操作变量的影响。推导出了 CO2 转化率和 CH4 纯度的简化二次模型方程，确定了实验条件内的最佳条件。最高 CO2 转化率的建议条件是 297 °C、4.66H2/CO2 和 4.0 Ug/Umf（速度比），而为获得最高的 CH4 纯度而确定了不同的条件。在操作变量中，温度是影响最大的因素，其次是气体比。最高的 CO2 转化率和 CH4 纯度分别为 98% 和 81.6%。此外，在 10 小时连续 CO2 甲烷化实验中发现传热系数 (ho) 为 115 W/m2∙°C，这是进一步扩大工艺规模的重要设计因素。