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A fixed-bed reactor modeling study on the methanation of CO2

机译:一个床反应器建模研究二氧化碳甲烷化的

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摘要

The methanation of carbon dioxide has gained renewed interest during the last years as a possible technology to synthesize a feasible chemical energy carrier. This modeling study aims at a basic understanding of the aspects relevant for designing an externally cooled fixed-bed reactor for the methanation of a pure, stoichiometric feed gas. It is shown that the reaction rates and the exothermicity (ΔH° =-165 kj/mol) prevent a fixed-bed reactor of technical dimensions to be operated at high conversions without runaway of the reactor. The model predictions of differently detailed pseudo-homogeneous reactor models and a heterogeneous reactor model where the intraparticle transport of mass is described according to a dusty-gas approach are compared to assess the needed level of detail in terms of modeling the heat transfer, fluid flow characteristics and transport resistances on the pellet scale. Under specific conditions, intraparticle mass transfer and external heat transfer need to be considered for describing the temperature and concentration profiles adequately. The study is completed by modeling a fixed-bed membrane reactor as an example of a structured reactor that offers improved temperature control by separated and controlled feeding of hydrogen and carbon dioxide.
机译:的二氧化碳甲烷化了在最后一年的新的兴趣可能的技术合成一个可行的化学能量载体。在相关方面的基本理解设计一个外部冷却固定床甲烷化反应器的纯粹,化学原料气。反应速率和放热性(ΔH°= -165焦每摩尔)防止床反应器技术尺寸在高转换操作没有失控的反应堆。不同的详细的预测pseudo-homogeneous反应器模型和一个多相反应器模型的地方intraparticle运输质量根据星云的方法进行比较评估所需的详细级别的建模传热,流体流动和运输抗性特征球团的规模。intraparticle传质和外部热量转移需要考虑描述温度和浓度配置文件充分。固定床膜反应器的一个例子结构化反应器提供改善温度控制由分离和控制喂养的氢气和二氧化碳。

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