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Factorial design analysis of parameters for the sorption-enhanced steam reforming of ethanol in a circulating fluidized bed riser using CFD

机译：用CFD循环流化床提升液中乙醇吸附增强蒸汽重整参数的阶乘设计分析

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The sorption-enhanced steam reforming of ethanol (SESRE) has recently been reported as a novel process for hydrogen (H-2) production. SESRE can operate well on a Ni-based catalyst with dolomite as a sorbent in packed-bed reactors. In this study, the circulating fluidized bed (CFB) concept was proposed to obtain higher productivity and continuous operation of SESRE. Particular focus was directed to the design and selection of suitable operating conditions of the CFB riser. Two-dimensional transient models using the Euler-Euler approach and the kinetic theory of granular flows were applied to investigate the H-2 production performance from a pilot-scale riser. The 2(k) full factorial design method was utilized to examine the significances of five specific parameters, namely, the riser diameter, inlet temperature, catalyst-to-sorbent ratio, solid flux, and inlet gas velocity on two response variables, namely, H-2 purity and H-2 flux. From the ANOVA results, either the main effect or the interactions of each parameter were shown to be significant on both the H-2 purity and the H-2 flux, particularly the riser diameter and the solid flux. For optimizing the operation and reaction parameters, the best case was the system with riser diameter of 0.2 m, inlet temperature of 600 degrees C, catalyst-to-sorbent ratio of 2.54 kg kg(-1), solid flux of 200 kg m(-2) s(-1), and gas velocity of 3 m s(-1), obtaining H-2 purity of 91.30% on a dry basis with a significantly high H-2 flux of 0.147 kg m(-2) s(-1). The hydrodynamics showed that SESRE reached breakthrough within the bottom dense zone. However, incomplete conversion occurred in the core of the riser because of the very dilute bed.
机译：最近据报道了乙醇（SESRE）的吸附增强蒸汽重整为氢气（H-2）生产的新方法。芝麻可以在含有白云岩的基于Ni的催化剂上运行良好，作为填充床反应堆的吸附剂。在这项研究中，提出了循环流化床（CFB）概念以获得更高的生产率和芝麻的连续操作。特殊的重点是针对CFB立管的合适操作条件的设计和选择。使用欧拉 - 欧拉方法的二维瞬态模型和粒状流动的动力学理论，从飞行员规模提升板上调查H-2生产性能。 2（k）完整因子设计方法用于检查五个特定参数的重要性，即提升管直径，入口温度，催化剂 - 吸附剂比，固体通量和入口气体速度，即两个响应变量，即， H-2纯度和H-2通量。从ANOVA结果，每个参数的主要效果或相互作用在H-2纯度和H-2助焊剂上显示出显着，特别是提升管直径和固体通量。为了优化操作和反应参数，最佳情况是具有提升管直径0.2米的系统，入口温度为600℃，催化剂 - 吸附剂比为2.54千克（-1），固体通量为200千克（ -2）S（-1）和3ms（-1）的气体速度，在干基础上获得91.30％的H-2纯度，具有0.147kg m（-2）的显着高H-2通量（ -1）。流体动力学表明，芝麻在底部密集区域内达到了突破。然而，由于非常稀释的床，提升机的核心发生在核心的不完全转换。

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  • 来源
    《RSC Advances》 |2018年第43期|共22页
  • 作者

    Phuakpunk Kiattikhoon; Chalermsinsuwan Benjapon; Putivisutisak Sompong; Assabumrungrat Suttichai;

  • 作者单位

    Chulalongkorn Univ Ctr Excellence Catalysis &

    Catalyt React Engn Dept Chem Engn Fac Engn Bangkok 10330 Thailand;

    Chulalongkorn Univ Fac Sci Fuels Res Ctr Dept Chem Technol Bangkok 10330 Thailand;

    Chulalongkorn Univ Adv Computat Fluid Dynam Res Unit Bangkok 10330 Thailand;

    Chulalongkorn Univ Ctr Excellence Catalysis &

    Catalyt React Engn Dept Chem Engn Fac Engn Bangkok 10330 Thailand;

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