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Experiment and numerical analysis of catalytic CO_2 methanation in bubbling fluidized bed reactor

机译：起泡流化床反应器中催化CO_2甲烷化的实验与数值分析

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摘要

This study experimentally and numerically investigated the hydrodynamics, reaction kinetics, and heat transfer of a bench-scale bubbling fluidized bed (BFB) reactor for CO2 methanation. A three-dimensional gas-solid Eulerian computational fluid dynamics (CFD) model coupled with a modified Syamlal-O'Brien drag model and reaction kinetics for Ni-based catalysts was developed. The CFD model was validated against experimental data for pressure, temperature, and gas composition at 1 bar and an inlet flow rate of 2 L/min with an inlet N-2 content of 77.5%. The axial pressure drop, solid volume fraction, temperature, gas composition, and bed-to-wall heat transfer coefficient (HTC) were compared for four inlet N-2 contents: 77.5%, 50%, 25%, and 0%. As the inlet N-2 content decreased, the mean bed temperature increased from 340 to 456 degrees C, the gas volume decreased owing to the reaction, the fluidizing number (ug/umf) decreased from 4.1 to 3.5, and the solid holdup increased. Consequently, the HTC increased from 327 to 386 W/m(2)/K. This study identified successfully the effects of hydrodynamics and reaction kinetics on HTC in the BFB for CO2 methanation.
机译：本研究通过实验和数值研究了用于CO 2甲烷化的台压型鼓泡流化床（BFB）反应器的流体动力学，反应动力学和传热。开发了一种与改性的Syamlal-o'brien拖曳模型和用于Ni基催化剂的改性型术型拖曳模型和反应动力学的三维气体固体欧拉计算流体动力学（CFD）模型。 CFD模型针对1巴的压力，温度和气体组合物的实验数据验证，入口流速为2L / min，入口N-2含量为77.5％。将轴向压降，固体馏分，温度，气体组合物和床壁传热系数（HTC）进行比较，以4入口N-2含量：77.5％，50％，25％和0％。随着入口N-2含量降低，平均床温度从340升至456℃，由于反应，气体体积降低，流化数（UG / UMF）从4.1降低到3.5，固体保持增加。因此，HTC从327增加到386W / m（2）/ k。该研究成功地确定了流体动力学和反应动力学对CO 2甲烷化的BFB中HTC的影响。

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