翼翅形溢流管旋流器分离性能研究
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摘要
针对旋流器运行过程中存在短路流导致溢流跑粗的问题,提出一种翼翅形溢流管旋流器,并进行了数值模拟和试验研究。与传统圆柱形溢流管对比结果表明,利用翼翅结构可以引导一部分短路流到外旋流重新参与分离,溢流管下端截面径向速度降低,短路流汇入溢流管的流量减少;外旋流切向速度变大,分布更加平缓;零速包络面外移,更有利于分级。试验结果显示,翼翅形溢流管旋流器的底流产率升高,-20μm分级质效率由66. 74%增加到72. 13%,分级量效率由71. 93%增加到76. 35%,溢流中粗颗粒的含量明显减少,分离粒度变小,更有利于将细微级颗粒分离出来。
Aiming at the problem as the short-circuit flow leads to overflow with coarse particles,a wing-shaped vortex finder is proposed and numerical simulation and experimental research are carried out. Comparing with the traditional cylindrical vortex finder,the results show that the wing-shaped structure can guide a part of the short-circuit flow to the outer swirling flow and re-participate in the separation. The radial speed of the lower cross-section is reduced as well as the flow into the vortex finder; the swirling tangential velocity is increased and the distribution is more gradual; the zero-speed envelope surface shifts outward and it is more conductive to grading. The results also show that the underflow yield of the wing-shaped vortex finder cyclone is increased,the classification quality efficiency of-20μm is increased from 66. 74% to 72. 13% and the quantity efficiency of classification from 71. 93% to 76. 35%. The content of coarse particles in the vortex finder is significantly reduced,the separated particle size becomes smaller,and it is more advantageous to separate the fine particles.
Aiming at the problem as the short-circuit flow leads to overflow with coarse particles,a wing-shaped vortex finder is proposed and numerical simulation and experimental research are carried out. Comparing with the traditional cylindrical vortex finder,the results show that the wing-shaped structure can guide a part of the short-circuit flow to the outer swirling flow and re-participate in the separation. The radial speed of the lower cross-section is reduced as well as the flow into the vortex finder; the swirling tangential velocity is increased and the distribution is more gradual; the zero-speed envelope surface shifts outward and it is more conductive to grading. The results also show that the underflow yield of the wing-shaped vortex finder cyclone is increased,the classification quality efficiency of-20μm is increased from 66. 74% to 72. 13% and the quantity efficiency of classification from 71. 93% to 76. 35%. The content of coarse particles in the vortex finder is significantly reduced,the separated particle size becomes smaller,and it is more advantageous to separate the fine particles.
引文
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[3]刘杨,王振波.水力旋流器分离效率影响因素的研究进展[J].流体机械,2016,44(2):39-42.
[4]张玉龙,刘培坤,张悦刊,等.粉煤灰分级用旋流器试验研究[J].中国粉体技术,2017,23(04):77-81.
[5]魏德洲,张彩娥,高淑玲,等.水力旋流器内部流场及分选过程的研究进展[J].金属矿山,2015(02):12-19.
[6]袁惠新,方勇,付双成,等.旋流器的微米级颗粒分级性能分析[J].化工进展,2017,36(12):4371-4377.
[7]刘鸿雁,王亚,韩天龙,等.水力旋流器溢流管结构对微细颗粒分离的影响[J].化工学报,2017,68(05):1921-1931.
[8]曹雨平,姜临田.水力旋流器的研究现状和发展趋势[J].工业水处理,2015,35(02):11-14.
[9]王小兵,刘扬,崔海清,等.水力旋流器内部流体流动特性PIV实验[J].石油学报,2012,33(01):143-149.