This article presents a 3D full‐loop computational fluid dynamics (CFD) simulation of a circulating fluidized bed gasifier (CFBG). The simulation results are validated against the experimental data and found to be in good agreement. Thereupon, the effect of the process parameters, ie, temperature, pressure, air/coal (A/C) ratio, and steam/coal (S/C) ratio, on the performance of the gasifier is analyzed. The effect of temperature on the hydrodynamics was found to be small. The CO and H₂ increase, whereas the CO₂ and H₂O decrease with an increase in temperature. While the effect of pressure on the outlet species mole fraction is negligible, the gas and solid axial velocity decrease with an increase in pressure. With an increasing A/C ratio or decreasing S/C ratio, the combustion products (CO₂ and H₂O) increase, whereas the gasification products (CO and H₂) decrease due to the increase in the O₂ concentration. In addition, temperature increases with an increase in the A/C ratio or a decrease in the S/C ratio. The feed velocity increases with an increasing A/C or S/C ratio, and, accordingly, the pressure increases and bed height decreases. The CH₄ decreases in all of the cases as it is being consumed in gasification as well as combustion reactions.

中文翻译：

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3D全回路CFD模拟工艺参数对循环流化床煤气化的影响

本文介绍了循环流化床气化炉（CFBG）的3D全回路计算流体动力学（CFD）模拟。仿真结果与实验数据进行了验证，发现吻合良好。然后，分析了工艺参数，即温度，压力，空气/煤（A / C）比和蒸汽/煤（S / C）比对气化炉性能的影响。发现温度对流体动力学的影响很小。CO和H ₂增加，而CO ₂和H ₂O随温度升高而降低。尽管压力对出口物质摩尔分数的影响可以忽略不计，但气体和固体轴向速度会随着压力的增加而降低。随着A / C比增加或S / C比降低，燃烧产物（CO ₂和H ₂ O）增加，而气化产物（CO和H ₂）由于O ₂浓度的增加而减少。另外，温度随着A / C比的增加或S / C比的降低而升高。进料速度随着A / C或S / C比的增加而增加，因此，压力增加并且床高度降低。CH ₄ 在所有情况下，由于它在气化以及燃烧反应中被消耗，汞的含量都会降低。