首页|Peculiarities of particle motion inside cyclone separator by using LES-DRW model
Peculiarities of particle motion inside cyclone separator by using LES-DRW model
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NSTL
The short-circuit flow has a great influence on the separation performance in cyclone separator.Herein,we used the LES model and particle random trajectory model to simulate gas-solid two-phase flow,and analyzed the particle motion from two aspects of particle trajectory and residence time.The results showed that the separation efficiency of particles from 1 um to 10 um diameter presented an increasing first and then a gentle distribution.The separation efficiency began to decrease when the particle size was less than 10 μm.When the particle size was larger than 3 μm,the separation efficiency was above 80%,and the separation efficiency decreased sharply when the particle size was less than 3 μm.There was a phenomenon of top ash ring in the annular space,especially near the cyclone proof,where a lot of particles gathered.The particle aggregation was serious in 130-180 degrees.The top ash ring could be formed only when the force of particles was balanced,which was unevenly distributed and had a quasi-periodic shedding characteristic.In addition,part of the airflow blew obliquely to the incoming airflow after a rotation,resulting in compression phenomenon.These performances would not only cause the escape of particles and reduce the separation efficiency,but also cause abrasion of the wall.
Cyclone separatorSeparation efficiencyShort-circuit flowParticle trajectoryTop ash ring
Zhongxin Liu、Zhenhua Song、Zhuwei Gao
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Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province,School of Chemical Engineering and Technology,Hainan University,Haikou 570228,PR China
Department of Mechanics and Electrics Engineering,Hainan University,Haikou 570228,PR China
NSTL
