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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Investigation of solids circulation in a cold model of a circulating fluidized bed
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Investigation of solids circulation in a cold model of a circulating fluidized bed

机译：循环流化床冷模型中固体循环的研究

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Design of a fluidized bed gasification plant requires a good understanding of how operating parameters influence solids circulation, because this affects the heat transfer that sustains the reactions in the system. In this paper, the effect of various operating parameters, such as primary and secondary fluidizing airflows, on solids circulation within a scaled-down cold model of a circulating fluidized bed (CFB) was investigated. An operational map was developed to show regions of stable CFB operation and boundaries of unsatisfactory CFB operation, when fluidization becomes highly unsteady or inefficient due to gas bypass. Under stable operation, it was observed that solids circulation increased with an increase in primary and secondary fluidizing airflows and solids inventory of the plant. Provided the loop seal was fluidized properly, any changes in operating parameters resulted in the solids flow adjusting accordingly to maintain a proper gas seal and ensure stable operation. The operating parameters also affected the pressure drop across various points in the CFB, essentially due to redistribution of solids within the system. A new semi-empirical model was developed to estimate the ratio of solids that exit the CFB riser to solids that recirculate back into it. This model was based on considerations of the outlet geometry and solids inertia, in particular the ability of the solids to resist the change in direction of the airflow as it curves towards the exit of the CFB riser.
机译：流化床气化装置的设计需要充分了解操作参数如何影响固体循环，因为这会影响维持系统中反应的传热。本文研究了循环流化床（CFB）的按比例缩小的冷模型中各种操作参数（例如主流化和次级流化气流）对固体循环的影响。当流化由于气体旁路变得高度不稳定或效率低下时，开发了一个操作图以显示稳定的CFB操作区域和不令人满意的CFB操作边界。在稳定运行下，观察到固体循环随着一次和二次流化气流以及工厂固体存量的增加而增加。如果环路密封件已正确流化，则运行参数的任何变化都将导致相应地调整固体流量，以保持适当的气体密封并确保稳定的运行。操作参数还影响了CFB中各个点的压降，这主要是由于系统中固体的重新分布所致。开发了一种新的半经验模型来估算离开CFB立管的固体与再循环回到立管的固体的比率。该模型基于出口几何形状和固体惯性的考虑，尤其是当固体向CFB立管出口弯曲时，固体抵抗气流方向变化的能力。

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