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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical analysis of gasification performance via finite-rate model in a cross-type two-stage gasifier
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Numerical analysis of gasification performance via finite-rate model in a cross-type two-stage gasifier

机译：交叉式两级气化炉中气化性能的有限速率模型数值分析

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摘要

The gasification process of a pressurized, oxygen-blown, entrained-flow E-Gas like gasifier through numerical modeling is investigated by solving the 3-D, steady-state Navier-Stokes equations with the Eulerian-Lagrangian method. Eight chemical reactions are solved via the Finite-Rate/Eddy-Dissipation Model. The preliminary gasification process is successfully modeled and the global chemical'reactions are proved to be strongly affected by the finite rates. The results of parametric study show that the increasing O_2/Coal ratio results in a decrease of CO, but an increase of CO_2 and exit temperature. With a modified water-gas-shift reaction rate, a more reasonable trend is obtained that as the coal slurry concentration decreases, the mass flow rate of H_2, CO_2, and H_2O increase while that of CO decreases. As the amount of coal slurry mass flow in the first stage increases, the exit temperature and the mole fraction of H_2 and CO_2 increase, while that of CO decreases. However, different fuel distributions do not provide notable influence on gasification performance due to the large space inside the E-Gas gasifier allowing complete reaction. The overall results show that the present CFD model can adequately capture the gasification behavior and analyze gasification performance inside the gasifier.
机译：通过用欧拉-拉格朗日方法求解3-D稳态Navier-Stokes方程，通过数值模型研究了加压，吹氧，夹带气流E-Gas气化炉的气化过程。通过有限速率/涡耗模型求解了八个化学反应。成功地对初步气化过程进行了建模，并证明了有限速率对整体化学反应有很大的影响。参数研究的结果表明，增加的O_2 /煤比例导致CO的减少，但CO_2和出口温度的增加。在改变水煤气变换反应速率的情况下，获得了更为合理的趋势，即随着煤浆浓度的降低，H_2，CO_2和H_2O的质量流量增加而CO的质量流量减少。随着第一阶段中煤浆质量流量的增加，出口温度和H_2和CO_2的摩尔分数增加，而CO的出口温度下降。但是，由于E-Gas气化炉内部空间宽敞，可以实现完全反应，因此不同的燃料分配不会对气化性能产生显着影响。总体结果表明，本文的CFD模型可以充分捕捉气化行为并分析气化炉内部的气化性能。

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  • 作者

    Yan-Tsan Luan; Yau-Pin Chyou; Ting Wang;

  • 作者单位

    Chemistry Division, Institute of Nuclear Energy Research, Atomic Energy Council, Longtan, Taoyuan, Taiwan, ROC;

    Chemistry Division, Institute of Nuclear Energy Research, Atomic Energy Council, Longtan, Taoyuan, Taiwan, ROC,No. 1000, Wenhua Rd., Jiaan Village, Longtan Township, Taoyuan County 32546, Taiwan, ROC;

    Energy Conversion & Conservation Center, University of New Orleans, New Orleans, LA 70148, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coal gasification; CFD modeling; entrained-flow gasifier; E-gas gasifier;

    机译：煤气化CFD建模;气流床气化炉电子气化炉;

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