高温电解和二氧化碳甲烷化转化为气体的气体：反应器设计和过程建模,Industrial & Engineering Chemistry Research

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高温电解和二氧化碳甲烷化转化为气体的气体：反应器设计和过程建模
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1021/acs.iecr.8b00477
Emanuele Giglio ₁ , Fabio Alessandro Deorsola ₁ , Manuel Gruber ₂ , Stefan Raphael Harth ₂ , Eduard Alexandru Morosanu ₁ , Dimosthenis Trimis ₂ , Samir Bensaid ₁ , Raffaele Pirone ₁

Affiliation

这项工作涉及使用固体氧化物电池（SOEC）的高温蒸汽电解与二氧化碳甲烷化以产生可通过电力到天然气（P2G）途径直接注入天然气分配网格的合成天然气（SNG）之间的耦合。。从公开文献中获得的内在动力学已经用作推流反应器模型的基础，该推流反应器模型应用于一系列冷却的多管固定床反应器，用于甲烷合成。蒸发水被认为是冷却剂，可确保在反应器壳侧实现高传热系数。设计并优化了甲烷化段，以调节催化床内的最高温度并使催化剂负载最小化。然后，提出了高温电解与甲烷化耦合的工厂过程建模：此分析的主要目标是计算整个工厂的效率（以电转化为SNG的化学能计算）。电厂规模已设定为10兆瓦_EL SOEC基于电解单元; 在蒸汽电解之前，由放热甲烷化产生的热量完全用于蒸发水。为了减少组件数量，已设计了一个热交换器网络（HEN），从而导致外部热量需求等于185 kW（约为电解功率的1.9％）。基于SOEC的燃气发电系统具有更高的基于热值的效率，相当于≈86％（如果以较低的热值进行评估，则约为77％）。

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Power-to-Gas through High Temperature Electrolysis and Carbon Dioxide Methanation: Reactor Design and Process Modeling

This work deals with the coupling between high temperature steam electrolysis using solid oxide cells (SOEC) and carbon dioxide methanation to produce a synthetic natural gas (SNG) directly injectable in the natural gas distribution grid via a power-to-gas (P2G) pathway. An intrinsic kinetics obtained from the open literature has been used as the basis for a plug flow reactor model applied to a series of cooled multitube fixed bed reactors for methane synthesis. Evaporating water has been considered as coolant, ensuring a high heat transfer coefficient within the shell side of the reactor. A methanation section has been designed and optimized in order to moderate the maximum temperature within the catalytic bed and to minimize the catalyst load. Then, process modeling of a plant coupling high temperature electrolysis and methanation is presented: the main goal of this analysis is the calculation of overall plant efficiency (in terms of electricity-to-SNG chemical energy). Plant size has been set considering a 10 MW_el SOEC-based electrolysis unit; heat produced from the exothermal methanation is entirely used for water evaporation before the steam electrolysis. A heat exchanger network (HEN) has been designed in order to reduce the number of components, resulting in an external heat requirement equal to 185 kW (≈1.9% of the electrolysis power). The SOEC-based power-to-gas system presented a higher heating value based efficiency equal to ≈86% (≈77% if evaluated on lower heating value basis).

更新日期：2018-03-13

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