An experimental apparatus including a dipleg and a trickle valve was established to simulate the operation of a suspended dipleg-trickle valve system of cyclone used in fluid catalytic cracking (FCC) unit. The flow regimes in the dipleg and the discharge modes in the trickle valve were studied by combining the observation of experimental phenomena with the analysis of transient pressure fluctuation. The results show that the flow regimes in the dipleg have two types—the dilute–dense phase coexisting falling flow and the dilute falling flow. Correspondingly, the trickle valve also has two discharge modes—the intermittent periodic dumping discharge and the continuous trickling discharge. The power spectrum density of pressure fluctuation displays that the gas–solids flow in the dipleg-trickle valve system is characterized by a low-frequency pulsation. The coherence coefficient explains the origin and propagation of pressure fluctuation in the system. Eventually, a map describing the flow regimes and discharge modes related to the operation parameters was proposed, which can provide a helpful guidance for the operation of cyclone dipleg-trickle valve system in FCC unit.

中文翻译：

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滴流阀旋风浸入式支腿中颗粒流态的实验研究。

建立了包括浸入式阀和滴流阀的实验装置，以模拟用于流化催化裂化（FCC）装置的旋风分离器的悬浮式浸入式滴漏阀系统的运行。通过对实验现象的观察和瞬态压力波动的分析相结合，研究了浸渍管中的流态和滴流阀中的排放方式。结果表明，浸入管中的流态有两种类型：稀密相同时存在下降流和稀稀流。相应地，滴流阀还具有两种排放模式：间歇性定期倾倒排放和连续滴流排放。压力波动的功率谱密度显示，浸入式滴流阀系统中的气固流动具有低频脉动的特征。相干系数解释了系统中压力波动的起源和传播。最终，提出了描述与运行参数有关的流态和排放方式的图表，这可以为FCC装置中旋风双排阀-滴流阀系统的运行提供有益的指导。