Optimal design of catalytic reactors for direct biogas methanation through thermodynamic analysis and 2-D reactor modeling

IF 7.7 2区 工程技术 Q1 CHEMISTRY, APPLIED
Emanuele Giglio , Paolo Bruno , Enrico Catizzone , Girolamo Giordano , Massimo Migliori
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Abstract

Catalytic methanation upgrades biogas by reacting it with hydrogen. Thermodynamic analysis of a two-step adiabatic process explored temperature control (below 550 °C for catalyst stability). Reactant staging proved insufficient for hot spot management. Product recycling in the first reactor effectively controlled temperature and produced synthetic natural gas (SNG) approaching grid quality. A two-dimensional model of cooled multi-tubular reactors revealed significant radial thermal gradients. A once-through configuration exceeded the temperature limit despite cooling. Reactant staging failed to simultaneously control temperature and achieve targeted conversion. Conversely, product recycling successfully addressed both constraints. Two configurations were proposed: stoichiometric hydrogen (STOIC) and hydrogen-deficient (H-DEF). Optimized reactor designs, employing a 0.30–0.35 recirculation ratio, were developed for both. The STOIC configuration required 18 parallel tubes for the first reactor and 33 for the second. The H-DEF unit utilized 22 tubes in both reactors. These findings highlight product recycling as a viable strategy for efficient and controlled biogas upgrading via catalytic methanation in multi-tubular reactors.
通过热力学分析和二维反应器建模,对沼气直接甲烷化催化反应器进行优化设计
催化甲烷化通过与氢反应使沼气升级。热力学分析的两步绝热过程探索温度控制(低于550℃的催化剂稳定性)。反应物分期被证明不足以进行热点管理。第一反应器的产品回收有效地控制了温度,生产出接近电网质量的合成天然气(SNG)。多管堆的二维冷却模型显示了显著的径向热梯度。一次直通配置超出温度限制,尽管冷却。反应物分期未能同时控制温度和实现目标转化。相反,产品回收成功地解决了这两个限制。提出了两种构型:化学计量氢(STOIC)和缺氢(H-DEF)。优化反应器设计,采用0.30-0.35的再循环比,为两者开发。STOIC的配置要求第一个反应堆有18个平行管,第二个反应堆有33个平行管。H-DEF装置在两个反应堆中使用了22根管子。这些发现强调了产品回收是通过多管反应器催化甲烷化高效和可控的沼气升级的可行策略。
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来源期刊
Fuel Processing Technology
Fuel Processing Technology 工程技术-工程:化工
CiteScore
13.20
自引率
9.30%
发文量
398
审稿时长
26 days
期刊介绍: Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.
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