Energy Efficiency Improvement of CO<sub>2</sub> Methanation Process by using a Thermally Self-Sustained Two-Stage Reactor: Preliminary Evaluation of a Reactor Concept

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  • 二段メタン化反応器の熱的自立化によるCO<sub>2</sub>メタン化プロセスの高効率化—実現手法の提案とその有効性の評価—
  • 二段メタン化反応器の熱的自立化によるCO₂メタン化プロセスの高効率化 : 実現手法の提案とその有効性の評価
  • ニダン メタンカ ハンノウキ ノ ネツテキ ジリツカ ニ ヨル CO ₂ メタンカ プロセス ノ コウコウリツカ : ジツゲン シュホウ ノ テイアン ト ソノ ユウコウセイ ノ ヒョウカ

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Abstract

<p>This study proposed a reactor concept for CO2 methanation, aiming to realize high CO2 conversion (≥ 99%) and high heat recovery rate under low pressure and thermally self-sustained conditions. The reactor has two stages with intermediate removal of water, and the portion of H2 is supplied at the second-stage reactor inlet while CO2 is provided only at the first-stage reactor inlet. The heat carrier flows directly from the first-stage reactor outlet to the second-stage reactor inlet, and the heat carrier path also branches between the first and second stages, resulting in a reduced heat carrier flow rate in the second stage. The efficacy of the concept was evaluated at 200 kPa (G). The results show that both stages of the reactor can be thermally self-sustained by feeding H2 stepwise, a high CO2 conversion (≥ 99%) can be achieved by directly providing the heat carrier, and the heat recovery rate can be improved by branching the heat carrier path between the first and second stages. The responses of the conversion and the heat recovery rate at each stage to variation of the operational parameters (H2 provision rate and heat carrier flow rate at each stage) were also examined. The results show that, in order to simultaneously achieve high CO2 conversion and heat recovery rate, CO2 conversion is required to be established with lowering the inlet heat carrier temperature in the second-stage reactor.</p>

Journal

  • KAGAKU KOGAKU RONBUNSHU

    KAGAKU KOGAKU RONBUNSHU 46 (3), 63-70, 2020-05-20

    The Society of Chemical Engineers, Japan

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