Numerical simulation of natural vortex length in riser termination with SVQS system

doi:10.11949/j.issn.0438-1157.20160381

Abstract

Abstract:

To optimize the cylinder height of the closing section, the gas phase flow field and the natural vortex length in a φ600 mm×4150 mm super vortex quick separation (SVQS) system were simulated by using the RNG k-ε turbulent model. The simulation results show that the cross-section location of the vortex end was agreeable to that of 88% attenuation of the maximum tangential velocity in the entrance section of flow partition column, which hence defined the natural vortex length. From the tangential velocity distribution of gas phase in SVQS, the natural vortex length of the quick separation was found to increase with the increase of spout velocity and the decrease of stripping velocity. Based on the numerical simulation and structural characteristics of SVQS, an equation for calculating the natural vortex length in SVQS was developed.

Key words: riser, separation, computational fluid dynamics

摘要：

采用RNG k-ε湍流模型对一套φ600 mm×4150 mm的SVQS旋流快分装置的气相流场及自然旋风长度进行了模拟研究。结果表明，SVQS旋风尾涡的截面位置与隔流筒下端面最大切向速度衰减达88%时的截面位置相吻合，并据此定义了SVQS的自然旋风长度。基于SVQS旋流快分切向速度的分布规律发现，SVQS的自然旋风长度随喷口气速的增加和汽提气速的减小而逐渐增大。参照旋风分离器自然旋风长度的计算方法，基于SVQS旋流快分的结构特点及模拟计算结果，提出了提升管出口SVQS旋流快分自然旋风长度的计算关系式。

关键词: 提升管, 分离, 计算流体力学

CLC Number:

CHENG Zhaolong, E Chenglin, LU Chunxi. Numerical simulation of natural vortex length in riser termination with SVQS system[J]. CIESC Journal, 2016, 67(8): 3347-3356.

程兆龙, 鄂承林, 卢春喜. 提升管出口SVQS自然旋风长度的数值模拟[J]. 化工学报, 2016, 67(8): 3347-3356.

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