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Numerical study of hydrogen production by the sorption-enhanced steam methane reforming process with online CO_2 capture as operated in fluidized bed reactors

机译:流化床反应器中在线吸附CO_2的吸附增强型蒸汽甲烷重整工艺制氢的数值研究

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摘要

A three-dimensional (3D) Eulerian two-fluid model with an in-house code was developed to simulate the gas-particle two-phase flow in the fluidized bed reactors. The CO_2 capture with Ca-based sorbents in the steam methane reforming (SMR) process was studied with such model combined with the reaction kinetics. The sorption-enhanced steam methane reforming (SE-SMR) process, i.e., the integration of the process of SMR and the adsorption of CO_2, was carried out in a bubbling fluidized bed reactor. The very high production of hydrogen in SE-SMR was obtained compared with the standard SMR process. The hydrogen molar fraction in gas phase was near the equilibrium. The breakthrough of the sorbent and the variation of the composition in the breakthrough period were studied. The effects of inlet gas superficial velocity and steam-to-carbon ratio (mass ratio of steam to methane in the inlet gas phase) on the reactions were studied. The simulated results are in agreement with the experimental results presented by Johnsen et al. (2006a, Chem Eng Sci 61:1195-1202).
机译:建立了带有内部代码的三维(3D)欧拉二流体模型,以模拟流化床反应器中的气固两相流。结合反应动力学研究了该模型在蒸汽甲烷重整(SMR)过程中用Ca基吸附剂捕获CO_2的能力。在鼓泡流化床反应器中进行吸附增强的蒸汽甲烷重整(SE-SMR)过程,即SMR过程和CO 2吸附的结合。与标准SMR工艺相比,在SE-SMR中获得了很高的产氢量。气相中的氢摩尔分数接近平衡。研究了吸附剂的突破以及在突破期的组成变化。研究了进气的表观速度和汽碳比(进气中蒸汽与甲烷的质量比)对反应的影响。模拟结果与Johnsen等人提出的实验结果一致。 (2006a,Chem Eng Sci 61:1195-1202)。

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