【作者】 晁忠喜； 孙国刚； 魏耀东； 时铭显；

【Author】 CHAO Zhong-xi, SUN Guo-gang, WEI Yao-dong, SHI Ming-xian (Faculty of chemical science and engineering, Petroleum university, Beijing 100220,China)

【机构】 石油大学化工学院；

【摘要】 本文在催化裂化沉降器升气管外壁颗粒沉积实验的基础上,结合气相流场数值模拟的结果,分析了升气管外近壁气相流场的分布特点和颗粒所受径向力的分布特点.结果表明对应工业旋风分离器结焦区域为边界层增厚区,非结焦区域对应边界层分离区.对应工业旋风分离器结焦区域,气体、颗粒径向速度均朝内;对应非结焦区域,气体、颗粒径向速度均朝外.在此基础上分析了结焦的原因.更多还原

【Abstract】 Based on panicle deposition experiments and numerical simulation results of gas flow in the near wall region of the external surface of the exit tube in a FCC cyclone separator, gas flow and actions on particles were analyzed. The results reveal that the coking zone in an industrial device is an increasing boundary layer zone, and the non-coking zone is a separated flow zone. In the coking zone, radial velocity of gas and radial force of fine particles are centripetal and in the non-coking zone, they are centrifugal. On the basis of the results, coking reasons were discussed.更多还原