Liquid film flow and separation characteristics in the swirl separation section of a tubular deliquidiser
The flow characteristics of the liquid film in the cyclone section of the tubular deliquidiser are the key factors affecting the separation performance.It is very important to understand the relationship between liquid film flow and separation efficiency for structure improvement and performance improvement.In this paper,the factors such as liquid-gas ratio,inlet gas velocity,split flow ratio and outlet angle of swirl blade and so on were changed to obtain the high-speed photographic images and separation efficiency of liquid film flow under different operating conditions by carrying out laboratory experiments.The image analysis method of the velocity and angle of the surface wave of the liquid film was established based on Matlab programming to determine the relationship between the flow characteristics of the liquid film and the separation efficiency.The results showed that when the liquid-gas ratio was in the range of 0.12-0.3L/m3,the effects of liquid-gas ratio and split flow ratio on the separation efficiency and the surface wave velocity of liquid film were not obvious.The inlet velocity had the most significant effect on the separation efficiency and liquid film surface wave velocity.With the inlet velocity increasing gradually,the separation efficiency increased first and then decreased,and the inflection point occurred at the inlet velocity of 18.82m/s.The separation efficiency was 30°>45°>60° from large to small,and the surface wave velocity of liquid film was 60°>45°>30° from large to small,when the exit angle of swirl blade was 30°,45° and 60°,respectively.In general,the critical value of liquid film surface wave velocity in the swirl separation pipe segment was 0.98m/s,and when the liquid film surface wave velocity was greater than this value,the liquid film was more likely to break at the liquid outlet of the annular gap,and some of the broken large droplets entered the gas phase outlet under the action of gravity and air flow,resulting in a significant decline in gas-liquid separation efficiency.When the surface wave velocity of liquid film was less than 0.98m/s,the separation efficiency was basically kept above 98%.
gas-liquid separationliquid film flow characteristicsfilm surface wave velocityseparation efficiency
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