基于喷射流泥沙采集器的沉积层粒子特性对流化特性的影响  

Influence of Particle Characteristics of Sedimentary Layer on Fluidization Characteristics Based on Spraying Jet Type Sand Collector

作　　者：朱彤[1] 江晶[1] 徐增梅[1] 王宇硕 谢元华[1] 韩进[1] 野崎勉[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110004

出　　处：《过程工程学报》2009年第S2期190-194,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:30671726);国家博士后科研资助金资助项目(编号:20070410267)

摘　　要：Nozaki开发出一种以流体为载体,带有喷射口与吸入口的喷射流式泥沙采集器.利用尺寸、密度不同的颗粒物在多相流体中的运动特性,该装置可实现颗粒物如泥沙、谷物的采集和分离.该装置通过喷射流体搅动泥沙沉积层并使其流化,之后通过吸引流将泥沙颗粒收集.喷射、吸引、采集及分离等过程受到装置的结构、沉积层中粒子的物理特征等诸多因素的影响.本工作采用喷射口直径6mm,吸引口直径30mm的实验装置,以水为流体载体,设定相应的喷射流和吸引流流速,选择密度(2520~2587kg/m3)相近的直径在37.5~855mm之间的球形玻璃和大小相当的火山灰粒子为被采集物.针对两种粒子的沉积层对流化域体积、流化域表面的最大半径的影响,喷射流和吸引流对沉积层作用时间对流化域体积的影响等进行了实验研究.结果表明,最佳流化特性出现在200mm的粒子,其流化特性与粒子形状特性无关.尽管两种粒子的流化域体积相近,但是流化域表面半径差异较大.A novel spraying jet type sand collector,which used liquid as carrier and had an injection mouth and a suction mouth at the collecting port,was designed and exploited by Nozaki.Utilizing the characteristics of particles with different densities,sizes and shapes,this equipment can separate and collect the particles just like sludge,sand or grains.The principle of this equipment is injecting fluids to fluidizing sedimentary layer of particles first,and then utilizing suction flow to collect particles.The process of injecting,suction and collection was influenced by some parameters,such as the structure of equipment and physical characteristics of particles in sedimentary layer.In this study,a sand collector with 6 mm diameter of injection mouth and 30 mm diameter of suction mouth at the collecting port was proposed,with water as the carrier,and speed of spraying flux and suction flux were set.The similar diameter of glass beads(56.5~855 mm) and volcanic ash(37.5~855 mm) with similar density(2520~2587 kg/m3) were selected as the experimental objects.The study was carried out on the influence of two sedimentary layers with the two sorts of particles on the volume of fluidization domain and the maximal diameter of fluidization domain surface,and on the influence of spraying flux and suction flux on the effect time with sedimentary layer and the volume of fluidization domain.It was found that the particles with 200 mm had the optimal fluidization characteristics,which had no relationship with particle shape characteristics.Although two kinds of particles had similar volumes of fluidization domain,but the difference between their diameters of fluidization domain surface was large.

关 键 词：喷射流采集器 沉积层 流化域 粒子特性 

分 类 号：TQ022.4[化学工程]