Effect of terminator injection on catalytic cracking reactions in FCC riser

doi:10.11949/j.issn.0438-1157.20160438

Abstract

Abstract:

The flow, heat transfer and reaction behaviors in the fluid catalytic cracking (FCC) riser before and after the injection of terminator were simulated by the computational fluid dynamics (CFD) method. Distributions of velocity, solid catalyst volume fraction, temperature, and species concentration in FCC riser were obtained after the injection of terminator. Besides, the action zone of the terminator and the effect on cracking reactions were analyzed with different mass fraction and teeming height of the terminator. The simulation results showed that with injection of the terminator, the velocity of oil gas was increased but volume fraction and temperature of the catalyst as well as temperature of the oil gas were decreased. The change in flow and the heat transfer caused the reduction in degree of the cracking reactions and the secondary reaction of oil gas in the riser, which resulted in a higher yield of gasoline and lower yields of dry gas, LPG and coke. The action zone and the effect on cracking reaction varied with different mass fraction and teeming height of the terminator, which should be evaluated by actual process conditions.

Key words: riser, fluid catalytic cracking, terminator, computational fluid dynamics

摘要：

通过对催化裂化提升管注入终止剂前后的工况进行数值模拟，研究了终止剂注入对提升管内速度分布、催化剂颗粒浓度分布、温度分布以及组分浓度分布的影响，考察了不同注入量以及注入高度的终止剂在提升管内的作用区域及其对裂化反应的影响。研究表明，终止剂的注入大幅提升了提升管内的油气速度，降低了催化剂浓度、油气和催化剂的温度，使得提升管内原料的裂化程度降低，二次反应减少。且不同注入量和注入高度的作用区域不同，对裂化反应的影响不同，应根据实际工况进行分析。

关键词: 提升管, 催化裂化, 终止剂, 计算流体力学

CLC Number:

TQ021.1

WANG Min, WU Yingya, LAN Xingying, GAO Jinsen. Effect of terminator injection on catalytic cracking reactions in FCC riser[J]. CIESC Journal, 2016, 67(8): 3191-3201.

王敏, 吴迎亚, 蓝兴英, 高金森. FCC提升管反应器中终止剂注入对裂化反应的影响[J]. 化工学报, 2016, 67(8): 3191-3201.

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