近日，中国石油大学（北京）宋健斐团队探明了FCC旋风分离器中基于结焦的湿颗粒动态平衡模型及颗粒沉积模型的应用现状。相关论文发表在2026年9月2日出版的《颗粒学报》杂志上。

催化裂化（FCC）装置沉降器内旋风分离器排气管外壁的结焦沉积严重制约着设备的长周期安全运行。

研究组系统分析了沉降器内部颗粒沉积环境、焦炭样品的微观特征以及沉积层的演变规律，同时总结了颗粒接触理论、液桥力模型、恢复系数及各类临界沉积准则的应用现状。研究组提出了湿颗粒在旋风分离器排气管外壁沉积的动态平衡模型，该模型采用临界速度判据判定颗粒是否初始沉积，并进一步引入临界剪切剥落判据：当近壁面摩擦速度超过临界剪切速度时，沉积颗粒发生滚动剥落；反之，焦层继续生长直至达到动态平衡。

模型充分考虑了强旋流场中的离心力、Saffman力、Magnus力、曳力和压力梯度力，液桥力和范德华力为主要黏附力。基于临界力矩理论，推导了临界剪切速度的解析表达式。参数敏感性分析和反算验证表明了模型的合理性。该模型为FCC旋风分离器排气管结焦的半定量预测提供了新的理论工具，并为后续跨尺度数值模拟和防结焦技术开发奠定了基础。

附：英文原文

Title: Wet particle dynamic equilibrium model based on coking in FCC cyclone separators and application status of particle deposition models

Author: anonymous

Issue&Volume: 2026/09/02

Abstract: The carbonaceous deposition on the outer wall of the vortex finder in the cyclone separator within the disengager of fluid catalytic cracking (FCC) units severely restricts the long-term safe operation of the equipment. This paper systematically analyzes the particle deposition environment inside the disengager, the microscopic characteristics of coke samples, and the evolution patterns of the deposition layer. It also summarizes the current application status of particle contact theory, liquid bridge force models, restitution coefficients, and various critical deposition criteria. This paper proposes a dynamic equilibrium model for wet particle deposition on the outer wall of a cyclone separator vortex finder. The model uses a critical velocity criterion to determine whether particles initially deposit, and further introduces a critical shear detachment criterion: when the near-wall friction velocity exceeds the critical shear velocity, deposited particles undergo rolling detachment; otherwise, the coke layer continues to grow until a dynamic equilibrium is reached. The model fully accounts for the centrifugal force, Saffman force, Magnus force, drag force, and pressure gradient force in a strong swirling flow field, with the liquid bridge force and van der Waals force as the main adhesive forces. Based on critical moment theory, an analytical expression for the critical shear velocity is derived. Parameter sensitivity analysis and back-calculation verification demonstrate the rationality of the model. The model provides a new theoretical tool for the semi-quantitative prediction of coking on the vortex finder of FCC cyclone separators, and lays a foundation for subsequent cross-scale numerical simulation and anti-coking technology development.

DOI: 10.1016/j.partic.2026.08.033

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200126003287