Multi-spiral gas-liquid vortex separator pressure drop characteristics test

doi:10.11949/0438-1157.20190213

Abstract

Abstract:

To strengthen the gas-liquid centrifugal separation process and realize the high-efficiency separation of gas-liquid cyclone in the large-diameter separator, a multi-rotor gas-liquid vortex separation equipment was designed, which provided a new design for gas-liquid separation and large-scale design. It can provide a new idea to design for large-scale gas-liquid separator. The pressure drop characteristics are investigated in a large scale cold-separator model. The static pressure drop between the inlet and outlet was measured at different velocities of the swirling arm under pure air flow conditions. The velocities of the swirling arm ranged from 5.65 to 16.95 m/s, which can cover the operating conditions of the industry gas liquid separator. The experimental results show that the pressure drop and the velocity of the swirling arm presence a square relationship. The dimensionless standard deviation of the static pressure drop is maintained within 2%. Furthermore, the total pressure drop includes three parts, i.e., loss in inlet friction, loss in the separation space, and loss in outlet pipeline. It is found that the pressure drop occur in the separation space is the largest. A model between the pressure drop of each part and the velocity head of the swirling arm was then given. The resistance coefficient of this rig is 16, it has no significant increase compared to common cyclone separators. The total pressure drop is closely related to the velocity of swirling arm. The change of total pressure drop is slight after feeding liquid. The forecast equation of the resistance coefficient was obtained based on the experimental of four similar structures with different sizes. Compared to real resistance coefficient, the predicted results error is less than 0.5%.

Key words: centrifugal separation, pressure drop, model, prediction, gas-liquid two-phase flow

摘要：

为强化气液离心分离过程,实现在大直径分离器内的气液旋流高效分离,设计构思了一套多旋臂气液旋流分离设备，为气液分离大型化设计提供了一种新思路。在纯气流条件及不同的旋流臂喷出气速下对该分离设备进出口静压差进行了测量，实验结果表明，旋流分离设备静压差在整个运行过程中较为稳定，有较强的可预测性，无量纲标准偏差维持在2%以内，总压降与旋流臂出口气速呈现出良好的平方关系。进一步将总压降分解为入口及旋臂摩擦损失、分离器空间内摩擦损失和出口管路摩擦损失三个部分进行详细测量，获得了各部分压降与旋流臂出口速度头的定量关联模型，发现分离器空间内摩擦阻力损失在总压降中占比最大。GLVS总压降主要受旋流臂出口气速影响，加入液相后对压降影响很小。该旋流分离设备的阻力系数与普通旋风分离器相当，根据四组不同结构尺寸的旋流头得到了阻力系数与旋流头关键设计参数的关联式，为进一步结构优化提供了参考。

关键词: 离心分离, 压降, 模型, 预测, 气液两相流

CLC Number:

TQ 028.2

Wen ZHOU, Kangsong WANG, Chenglin E, Chunxi LU. Multi-spiral gas-liquid vortex separator pressure drop characteristics test[J]. CIESC Journal, 2019, 70(7): 2564-2573.

周闻, 王康松, 鄂承林, 卢春喜. 多旋臂气液旋流分离器压降特性试验[J]. 化工学报, 2019, 70(7): 2564-2573.

Figures/Tables 16

Fig.1 Schematic diagram of the experimental apparatus

Table 1 Experimental parameters design

入口气量/(m³/h)	入口气速/(m/s)	旋流臂出口气速/(m/s)	出气管气速/(m/s)	筒截面气速/(m/s)
1000	4.42	5.65	8.26	1.42
1400	6.19	7.91	11.56	1.98
1800	7.95	10.17	14.86	2.55
2200	9.72	12.43	18.17	3.11
2600	11.49	14.69	21.47	3.68
3000	13.25	16.95	24.77	4.25

Fig.2 Inlet tube gauge pressure vs radial position at different air flow rates

Fig.3 Outlet tube gauge pressure vs radial position at different air flow rates

Fig.4 Fluctuation of static pressure drop vs recording time at different air flow rates

Fig.5 Static pressure drop vs inlet gas flow rates

Table 2 Stability characterization of static pressure drop

入口气量/(m³/h)	静压时均值/Pa	标准差/Pa	无量纲标准差/%
1000	314.09	5.60	1.780
1400	644.94	6.67	1.034
1800	1071.92	8.96	0.836
2200	1638.95	12.14	0.741
2600	2215.58	14.90	0.672
3000	2948.92	19.36	0.657

Fig.6 Change of standard deviation with gas flow rates

Fig.7 Change of dimensionless standard deviation with gas flow rates

Fig.8 Segmental pressure drop measuring points

Table 3 Measured values of segmental pressure drop

Q_i/(m³/h)	P₁/Pa	P₂/Pa	P₃/Pa	ΔP′/Pa	ΔP/Pa	ε/%
1000	35.50	198.91	100.97	335.38	314.13	6.77
1400	81.54	381.25	207.48	670.26	644.92	3.93
1800	116.73	625.24	338.88	1080.86	1071.95	0.83
2200	170.80	914.59	508.54	1593.93	1638.92	2.75
2600	225.51	1232.11	717.44	2175.07	2215.56	1.83
3000	304.89	1641.61	978.52	2925.02	2948.93	0.81

Fig.9 Relationship between segmental pressure drop and velocity head of swirl arm

Table 4 Segmental pressure drop resistance coefficients

Pressure	ξ	R²
P₁	1.663	0.9935
P₂	8.949	0.9984
P₃	5.200	0.9991
ΔP	15.989	0.9995

Table 5 Summary of swirl head structure parameters

项目	SVQS-1	SVQS-2	SVQS-3	GLVS
进气管面积/mm²	7850	7850	9156	66475
旋流臂出口面积/mm²	5376	5376	9300	49152
筒截面面积/mm²	62800	62800	247683	129775
筒内径/mm	300	300	572	500
隔流筒直径/mm	160	160	380	400
进气方向	上行	下行	上行	下行
S值	11.68	11.68	26.63	2.64
M值	8.00	8.00	27.05	1.95
N值	0.53	0.53	0.66	0.80
阻力系数 $ξ$	2.46	2.53	35.34	15.99

Table 5 Summary of swirl head structure parameters

项目	SVQS-1	SVQS-2	SVQS-3	GLVS
进气管面积/mm²	7850	7850	9156	66475
旋流臂出口面积/mm²	5376	5376	9300	49152
筒截面面积/mm²	62800	62800	247683	129775
筒内径/mm	300	300	572	500
隔流筒直径/mm	160	160	380	400
进气方向	上行	下行	上行	下行
S值	11.68	11.68	26.63	2.64
M值	8.00	8.00	27.05	1.95
N值	0.53	0.53	0.66	0.80
阻力系数 $ξ$	2.46	2.53	35.34	15.99

Fig.10 Relationship between pressure drop of different structures and velocity head of swirl arm

Fig.11 Change of total pressure drop after feeding liquid

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