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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Transition velocities in the riser of a circulating fluidized bed
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Transition velocities in the riser of a circulating fluidized bed

机译：循环流化床立管中的过渡速度

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摘要

We attempted to study the hydrodynamics and flow regime transitions in a circulating fluidized bed (CFB).In conventional gas-solids fluidization,the flow regimes include the fixed bed,bubbling fluidization and turbulent fluidization,in which the regimes mainly depend on the gas velocity.However,in a CFB,the flow regime depends on both the solids circulation rate and gas velocity.The flow regimes in a CFB include the high-velocity fluidized bed and pneumatic conveying.Experiments were conducted in a column of 0.052 m internal diameter and 1.2 m long covering a wide range of operating conditions.The transport velocity was estimated by emptying time and extrapolation techniques.It was noticed from the present experimental observations that Geldart B-type particles move more or less as individual particles,while Geldart A-type particles have a tendency to form clusters.Empirical correlations have been proposed for the transport velocity U_(tr)and the chocking velocity U_(ch).A qualitative map of different flow regimes of a gas-solid fluidized bed has been proposed based transition velocities.
机译：我们试图研究循环流化床中的流体动力学和流态转变。在传统的气固流化中，流态包括固定床，鼓泡流化和湍流化，其中流态主要取决于气体流速。但是，在CFB中，流态取决于固体循环速率和气体速度。CFB中的流态包括高速流化床和气力输送。实验是在0.052 m的内径柱上进行的。 1.2 m长，适用于广泛的工作条件。通过排空时间和外推技术估算了运输速度。从目前的实验观察中注意到，Geldart B型颗粒作为单个颗粒或多或少地运动，而Geldart A型质点有形成团簇的趋势。已提出了传输速度U_（tr）和阻隔速度U_（ch）的经验相关性。已经提出了基于转变速度的气固流化床不同流态的分布图。

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