蜗壳式多通道气液旋流分离器结构优化及分离特性研究

doi:10.11949/0438-1157.20240222

摘要/Abstract

摘要：

为实现宽流量范围下气液两相流的高效分离，基于螺旋线理论设计出了一种新型蜗壳式多通道旋流分离器，并对其结构进行了优化设计。采用数值模拟方法将其与传统单入口气液旋流分离器进行性能对比，结果表明，新型蜗壳式多通道旋流分离器能有效解决单个入口所引起的空气核偏心现象及振荡问题，分离器内流场在不同入口含气率条件下均具有显著的轴对称特点，稳定性也更高，溢流带液量明显下降。虽然整体压损更大，但能够有效抑制二次流的产生，且在入口含气率越高时抑制效果越明显。

关键词: 气液两相流, 离心分离, 优化设计, 蜗壳, 二次流

Abstract:

In order to achieve the efficient separation of gas-liquid two-phase flow in a wide flow range, a new volute type multi-channel cyclone separator was designed based on the spiral theory, and its structure was optimized. A numerical simulation method was used to compare its performance with that of a traditional single-inlet gas-liquid cyclone separator. The results showed that the new volute type multi-channel cyclone separator can effectively solve the problem of air core eccentricity and oscillation caused by a single inlet. The flow field in the separator has distinct axial symmetry and higher stability under different inlet gas content conditions, and the amount of liquid in the overflow zone decreases significantly. Although the overall pressure loss is greater, the secondary flow can be effectively inhibited, and the suppression effect is more pronounced when the inlet gas content is higher.

Key words: gas-liquid two-phase flow, centrifugation, optimal design, volute, secondary flow

中图分类号:

TQ 051

李彦熹, 王晔春, 谢向东, 王进芝, 王江, 周煜, 潘盈秀, 丁文涛, 郭烈锦. 蜗壳式多通道气液旋流分离器结构优化及分离特性研究[J]. 化工学报, 2024, 75(8): 2875-2885.

Yanxi LI, Yechun WANG, Xiangdong XIE, Jinzhi WANG, Jiang WANG, Yu ZHOU, Yingxiu PAN, Wentao DING, Liejin GUO. Study on separation characteristics and structure optimization of a volute type multi-channel gas-liquid cyclone separator[J]. CIESC Journal, 2024, 75(8): 2875-2885.

图/表 14

图1 蜗壳结构及几何参数示意图

Fig.1 Schematic diagram of volute structure and geometric parameters

图2 网格无关性验证

Fig.2 Grid independence verification

图3 分离器筒体尺寸与实物

Fig.3 Separator cylinder size and physical object

图4 模拟所得相含率图与实验拍摄相界面图对比

Fig.4 Comparison of simulated phase content diagram and experimental phase interface diagram

图5 8个通道的气、水流量标准差及整体压损随入口含气率的变化趋势

Fig.5 The trend of standard deviation of gas and water flow in 8-channels and overall pressure loss with the variation of inlet gas content

图6 8个通道的气、水流量标准差及整体压损随通道入口夹角的变化趋势

Fig.6 The trend of standard deviation of gas and water flow in 8-channels and overall pressure loss with the variation of channel inlet angle

图7 8通道水流量和气流量在入口总流量内的占比

Fig.7 The proportion of water flow and gas flow in the total inlet flow in each of the eight channels

图8 两种旋流分离器模型

Fig.8 Two models of cyclone separators

图9 两种旋流分离器在不同入口含气率下的YZ截面含气率云图

Fig.9 YZ cross-sectional gas content contours of two types of cyclone separators at different inlet gas contents

图10 两种旋流分离器在不同入口含气率下的XY截面含气率云图

Fig.10 XY cross-sectional gas content contours of two types of cyclone separators at different inlet gas contents

图11 两种旋流分离器在不同入口含气率下的YZ截面切向速度云图

Fig.11 YZ cross-sectional tangential velocity contours of two types of cyclone separators at different inlet gas contents

图12 旋流分离器内局部流动示意图

Fig.12 Schematic of local flow inside the cyclone separator

图13 溢流管下端下行流量沿轴向坐标的变化

Fig.13 The variation of downstream flow rate along the axial coordinate at the lower end of the overflow pipe

表1 分离器评价指标对比

Table 1 Comparison of separator evaluation indicators

入口含气率	单入口旋流分离器			蜗壳式多通道旋流分离器
入口含气率	溢流带液量/(L/min)	底流含气率/％	整体压损/Pa	溢流带液量/(L/min)	底流含气率/％	整体压损/Pa
0.125	1.37	0.08	10462	0.32	0.01	41525
0.462	0.35	0.25	15901	0.05	0.07	67542
0.667	0.06	0.37	23406	0	0.09	106876

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