Influence of different vortex generators on performance of demister in wet flue gas desulfurization

doi:10.16085/j.issn.1000-6613.2018-1823

Abstract

Abstract:

The performance of separation efficiency and pressure drop of five kinds of vortex generators in demister of wet flue gas desulfurization (WFGD) were numerically investigated. The considered vortex generators included flat plate, elliptic plate, circular tube, square tube and triangle tube which have the same projected area with inlet velocity ranged from 3m/s to 6m/s. The Euler-Lagrangian method was used to solve the gas-liquid phase motion and droplet diameter was ranged from 2μm to 80μm. The results showed that flat plate has the best separation enhancement and the largest resistance loss whose separation efficiency and pressure drop are 31.98% and 30Pa higher than those of the wave type demister without vortex generators for U _in=3m/s respectively. The flat plate has a higher efficiency of removing 2μm droplet about 34.88%, which is 20.81% higher than the wave type. When U _in=3m/s, the separation efficiency and pressure drop of elliptic plate are much higher than the wave type demister without vortex generators by 29.14% and 20.47Pa respectively. The total removal efficiency of circular, square and triangular pipe is as high as 95.05%, 97.49% and 96.48%, respectively. For pressure drop, the square tube is 4.18 times of the demister without vortex generators, the circular tube and triangular tube are 2.05 times and 2.79 times of it respectively. In addition, the effect of attack angle of elliptic plate were evaluated and the results showed that under the same U _in, increasing angle attack results in increasing efficiency of mist removal and 50° elliptic plate has the separation efficiency of 97.09%~99.15%. The separation property of 2μm droplet has little effect by the attack angle. The pressure loss decreases as the attack angle decreases, which increases from 25.3Pa to 92.78Pa. High performance of the oval plate results from the optimal combination of the projected area facing air flow with aspect ratio as well as the streamlined surface structure with more vortices produced.

Key words: vortex generator, gas-liquid flow, separation, numerical simulation, attack angle

摘要：

通过数值模拟研究了平板、椭圆板、圆管、方管和三角管5种涡发生器分别安装于湿法烟气脱硫系统折流板除雾器中的除雾效率与压降。采用欧拉-拉格朗日方法分别求解气相-液相运动状态，入口流速U _in为3~6m/s，液滴直径范围2~80μm。结果表明，平板的除雾效率与压降增大最多，U _in=3m/s时，除雾效率相比无涡发生器高31.98%，压降高30Pa。平板对2μm液滴具有较高的除雾效率，最大为34.88%，比无涡发生器高20.81%。椭圆板U _in=3m/s时除雾效率比无涡发生器增加29.14%，压降升高20.47Pa。圆管、方管和三角管的总除雾效率分别高达95.05%、97.49%和96.48%。压降方面，方管为无涡发生器的4.18倍，圆管和三角管分别为2.05倍和2.79倍。另外，考察了椭圆板攻角的影响。在相同U _in下，除雾效率随着攻角的增加而增大，50°的椭圆板除雾效率为97.09%~99.15%。攻角对2μm液滴的分级除雾效率影响不大。压降随着攻角的增大而增加，U _in=4m/s时，攻角从0°增加到50°，压降从25.3Pa增加到92.78Pa。椭圆板因其迎流面积与长宽比的匹配以及流线型产生了较多涡流，具有良好的强化除雾效率效果以及较小的压降。

关键词: 涡发生器, 气液两相流, 分离, 数值模拟, 攻角

CLC Number:

TQ021.1

Laishun YANG, Minghai XU, Xianhang SUN, Jianxing WANG, Zhilei YANG. Influence of different vortex generators on performance of demister in wet flue gas desulfurization[J]. Chemical Industry and Engineering Progress, 2019, 38(06): 2600-2609.

杨来顺, 徐明海, 孙宪航, 王建星, 杨志磊. 涡发生器对脱硫系统除雾器性能的影响[J]. 化工进展, 2019, 38(06): 2600-2609.

Figures/Tables 13

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U _in/m?s^-1	η/%		η差值/%	Δp/Pa		Δp差值/Pa
U _in/m?s^-1	平板强化	管束强化^[25]	η差值/%	平板强化	管束强化^[25]	Δp差值/Pa
3	95.32	96.99	-1.67	38.02	55.75	-17.73
4	96.86	98.07	-1.21	64.94	97.79	-32.85
5	97.74	98.42	-0.68	108.59	142.57	-33.98
6	98.18	98.95	-0.77	155.21	197.79	-42.58

U _in/m?s^-1	η/%		η差值/%	Δp/Pa		Δp差值/Pa
U _in/m?s^-1	平板强化	管束强化^[25]	η差值/%	平板强化	管束强化^[25]	Δp差值/Pa
3	95.32	96.99	-1.67	38.02	55.75	-17.73
4	96.86	98.07	-1.21	64.94	97.79	-32.85
5	97.74	98.42	-0.68	108.59	142.57	-33.98
6	98.18	98.95	-0.77	155.21	197.79	-42.58

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