Abstract In the fluid catalytic cracking (FCC) unit, cyclones possess very less efficiency in the separation of particles smaller than 5 μm. Heterogeneous condensation, one of the most promising preconditioning technologies, can be applied in the FCC unit to improve the particle removal efficiency of cyclones. In this paper, the lab-scale equipment on heterogenous condensation was established and tested. Based on experimental investigation, a novel numerical method was presented to simulate the process of movement and growth of particles in the growth tube. The effects of critical operational parameters, such as the wall film temperature, gas inlet temperature, gas flow rate, and particle number concentration, were studied. The results show that when the gas flow rate is 2 lit·min−1, the average particle size at the outlet increased to 6.67 μm, and the number of particles smaller than 4 μm decreased to about 5%. Overall, this study guides for practical engineering applications.

中文翻译：

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流化催化裂化装置中不溶性颗粒非均相冷凝的实验与数值研究

摘要 在流化催化裂化 (FCC) 装置中，旋风分离器在分离小于 5 μm 的颗粒方面的效率非常低。非均相冷凝是最有前景的预处理技术之一，可应用于催化裂化装置以提高旋风分离器的颗粒去除效率。在本文中，建立并测试了实验室规模的多相缩合设备。在实验研究的基础上，提出了一种新的数值方法来模拟颗粒在生长管中的运动和生长过程。研究了壁膜温度、气体入口温度、气体流速和颗粒数浓度等关键操作参数的影响。结果表明，当气体流速为2 lit·min−1时，出口处的平均粒径增加到6.67 μm，小于 4 μm 的颗粒数量减少到 5% 左右。总的来说，本研究指导实际工程应用。