偏心双桨搅拌流场及效果分析
发布时间：2018-11-08 13:44
【摘要】：生产工艺中需要聚苯乙烯粒子在液相苯乙烯中均匀悬浮与混合,要求底部固相不堆积,固相浓度分布均匀。为了达到理想的搅拌效果,本文研究了双桨的偏心率及转速对搅拌混合效果的影响。以底部椭圆封头,无挡板的反应釜和双层6折叶的开启涡轮式搅拌器为研究对象,用Fluent软件对搅拌器偏心时水的搅拌流场及聚苯乙烯粒子-苯乙烯固液搅拌进行数值模拟。模拟了不同偏心率和转速对搅拌流型、聚苯乙烯粒子浓度分布及能耗的影响,并用粒子图像测速法(PIV)实验验证水的搅拌流场。结果表明,偏心搅拌可使流体速度得到增加,桨叶下方的搅拌死区得到有效抑制;偏心率增大导致两侧的速度偏差越来越大,能量分布不均匀;偏心搅拌的聚苯乙烯粒子浓度分布比对中搅拌的更为均匀,可改善粒子在苯乙烯中的悬浮效果;相同搅拌效果的情况下,偏心率为0.15的功率消耗是对中搅拌的85%;对该固液搅拌时的最佳偏心率和最佳转速分别为0.15和95 r/min,此时固液搅拌混合效果最好,固相浓度分布最为均匀,消耗功率相对较少。
[Abstract]:In the production process, polystyrene particles should be suspended and mixed uniformly in liquid styrene, and the solid phase should not be stacked at the bottom and the concentration of solid phase should be uniform. In order to achieve the ideal mixing effect, the effects of eccentricity and rotational speed of the two propellers on the mixing effect are studied in this paper. Taking the bottom elliptical head, the reactor without baffle and the open turbine agitator with double layer 40% discount blade as the research object, the flow field of water stirring and the solid liquid stirring of polystyrene particle and styrene were numerically simulated by Fluent software. The effects of eccentricity and rotational speed on agitation flow pattern, concentration distribution of polystyrene particles and energy consumption were simulated. The (PIV) experiment of particle image velocimetry was used to verify the mixing flow field of water. The results show that eccentricity agitation can increase the velocity of the fluid and restrain the dead zone under the blade effectively, and the increase of eccentricity leads to the increasing deviation of velocity on both sides and the uneven distribution of energy. The concentration distribution of polystyrene particles in eccentrically stirred is more uniform than that in stirring, which can improve the suspending effect of particles in styrene, and the power consumption of the eccentric ratio of 0.15 is 85% of that of the middle stirring under the same stirring effect. The optimum eccentricity and rotation speed are 0.15 and 95 r / min, respectively. At this time, the mixing effect is the best, the distribution of solid concentration is the most uniform, and the power consumption is relatively low.
【作者单位】： 上海应用技术大学机械工程学院;南京工业大学机械与动力工程学院;
【分类号】：TQ325.2;TQ027.2
本文编号：2318665
[Abstract]:In the production process, polystyrene particles should be suspended and mixed uniformly in liquid styrene, and the solid phase should not be stacked at the bottom and the concentration of solid phase should be uniform. In order to achieve the ideal mixing effect, the effects of eccentricity and rotational speed of the two propellers on the mixing effect are studied in this paper. Taking the bottom elliptical head, the reactor without baffle and the open turbine agitator with double layer 40% discount blade as the research object, the flow field of water stirring and the solid liquid stirring of polystyrene particle and styrene were numerically simulated by Fluent software. The effects of eccentricity and rotational speed on agitation flow pattern, concentration distribution of polystyrene particles and energy consumption were simulated. The (PIV) experiment of particle image velocimetry was used to verify the mixing flow field of water. The results show that eccentricity agitation can increase the velocity of the fluid and restrain the dead zone under the blade effectively, and the increase of eccentricity leads to the increasing deviation of velocity on both sides and the uneven distribution of energy. The concentration distribution of polystyrene particles in eccentrically stirred is more uniform than that in stirring, which can improve the suspending effect of particles in styrene, and the power consumption of the eccentric ratio of 0.15 is 85% of that of the middle stirring under the same stirring effect. The optimum eccentricity and rotation speed are 0.15 and 95 r / min, respectively. At this time, the mixing effect is the best, the distribution of solid concentration is the most uniform, and the power consumption is relatively low.
【作者单位】： 上海应用技术大学机械工程学院;南京工业大学机械与动力工程学院;
【分类号】：TQ325.2;TQ027.2
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