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新型旋流分级机的分级研究 总被引:2,自引:0,他引:2
利用Coanda效应和离心力场的筛分理论设计了新型旋流分级机,并测定了该机的分级点和分级精度,考察了一次风、二次风和微粉出口管径对分级效果的影响。 相似文献
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本文首先介绍了离心分级的基础理论,各种分级器的结构,本及在工业生产中的应用情况及效果。在需要将微粒分成多种粒径多级分级时,可采用多级串连离心分级法,并介绍了采用多级串连离心分级法,将粉煤灰分成:>80μm,80~45μm,45~25μm,25~10μm,<10μm等五种粒径范围的多级分级中型试验情况,包括分级工艺流程,各分级的串级率,回收率,电耗等具体数据;以及分级效果和经济效益。证明多级串连离心分级是可行的。具有工艺流程和设备简单、能耗低,操作管理方便、投资少、占地少、分级精度高等优点。且能适应各种物料任何粒径微粒的分级,分级精度可根据需要进行调整,可以推广应用。 相似文献
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研制了一种旋流旋转离心装置,可使离心力场的强度大大提高、分离效果显著改善。利用该装置治理餐饮业油烟污染,效果良好。 相似文献
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通过合理设计分级设备中分级力场方向和介质流体流动方向 ,将离心力场与错流分级形式相结合 ,研制出一种新型的分级设备——错流离心分级设备。本文详细阐述了该设备的工作原理和优点 ,并以石英微粉为原料进行了分级实验 ,实验结果表明该分级设备具有良好的分级性能。 相似文献
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在分析离心惯性分级理论的基础上,介绍了一种新型的分级设备-离心沉降分级装置,阐述了该装置的工作原理和优点。以石英粉为原料进行了分极实验,并对实验结果进行了初步的讨论。 相似文献
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介绍干法离心分级机的分级基本原理,讨论了转子转速、加料量、气流量等因素对UCM-4型分级性能的影响。 相似文献
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《分离科学与技术》2012,47(12):2915-2927
Abstract A new structure of hydrocyclone is designed to meet the demand of separating particles heavier or lighter than water simultaneously. Based on the conventional hydrocyclone, the structural modifications with a section in the middle and a volute chamber on the top of the hydrocyclone to accumulate the separated low density particles. Some factors that influence the separation efficiency of hydrocyclone were investigated in this paper. For the heavy phase, those influencing factors included the inlet flow rate and underflow split ratio. For the light one, different outlets for discharging the light phase were taken into account. The results show that there exists an optimum inlet flow rate for a series of underflow split ratios. The top outlet for separating light phase particles is better than the side outlet's. 相似文献
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《分离科学与技术》2012,47(13):1874-1879
Fluidized beds containing solid particles of a wide size distribution is of significant practical importance. In such systems, the overall behavior depends on the opposing effect of mixing and classification. In the present work, the mixing and segregation behavior of liquid fluidized beds containing particles of different sizes is described mathematically. Particle size distribution (PSD) is studied in a glass column of 5 cm internal diameter and 250 cm length. Ion exchange resins were used as a solid phase with a particle size range of 50 to 650 µm. The bed was fluidized at constant and low water flow velocity and the particle size measurement was carried out at different locations over the column length by analytical scanning electron microscope. Particle size fractionation data obtained by Malvern Mastersizer-2000, version 5.4, was utilized in the solution of developed model equations to obtain PSD. It is apparent that the mixing model along with the classification model represents better results than any other model given by various researchers in the literature. The proposed model is in good agreement with the PSD data given by Malvern particle size analyzer. 相似文献
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针对粒径中值低于50μm的油田细颗粒污泥较难处理的现状,设计并优选了一种适用于细颗粒分离用的固液旋流器。室内试验表明,设计并优选得到的主直径50mm、溢流口径12mm、锥角5度的固液旋流器在其工作流量3.2~3.6m^3/h内,可以针对粒径中值50μm以下的细颗粒污泥达到较好的分离效果。采用旋流器处理细颗粒油田污泥切实可行。 相似文献
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In order to improve the oil‐water separation efficiency of a hydrocyclone, a new process utilizing air bubbles has been developed to enhance separation performance. Using the two‐component phase Doppler particle analyzer (PDPA) technique, the velocities of two phases, air and liquid, and air bubble diameter were measured in a hydrocyclone. The air‐liquid mixing pump can produce 15 to 60 μm‐diameter air bubbles in water. There is an optimum air‐liquid ratio for oil‐water separation of a hydrocyclone enhanced by air bubbles. An air core occurs in the hydrocyclone when the air‐liquid ratio is more than 1 %. The velocities of air bubbles have a similar flow pattern to the water phase. The axial and tangential velocity differences of the air bubbles at different air‐liquid ratio are greater near the wall and near the core of the hydrocyclone. The measured results show that the size distribution of the air bubbles produced by the air‐liquid mixing pump is beneficial to the process where air bubbles capture oil droplets in the hydrocyclone. These studies are helpful to understand the separation mechanism of a hydrocyclone enhanced by air bubbles. 相似文献
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在小型循环流化床中对铁矿石粉在氮气气氛下用大同煤粉直接还原进行了实验研究,在800~950℃考察了反应温度对铁矿石粉的还原程度及还原产物微观结构的影响. 结果表明,随反应温度提高,铁矿石粉还原产物的金属化率及还原度均增加,800~850℃时增幅较大,850~900℃时增幅平缓,900~950℃时又出现较大增幅,950℃时达到63%的金属化率和87%的还原度;与还原前的铁矿石粉相比,还原产物的比表面积和总孔体积在800℃时均增加,而在其他温度时均减小,对应的平均孔径变化规律则相反. 相似文献
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利用内径150 mm的D型有机玻璃流化床模型,对澳矿、巴西矿、北方矿和钒钛矿典型铁矿粉的流化特性进行了实验研究,获得了其流化特性曲线、初始流化速度和最大床层压降,并将初始流化速度的实测值和理论计算值进行了比较分析. 结果表明,矿粉粒度是影响其流化特性的最主要因素,粒径越大,床层所需要的初始流化速度越大,实测值和理论估算值基本相符;粒度小于0.125 mm钒钛矿流动性较差,在流化过程中易出现沟流现象;粒度范围较宽的矿粉,完全流态化时,细矿粉随气流夹带逸出明显;在粒度相同的情况下,几种不同的铁矿粉的开始流化速度接近,而床层压降有较大差异,巴西矿的床层压降明显大于其他三种铁矿粉. 最大床层压降的最小值均出现在粒度为0.25~0.425 mm,为铁矿粉流态化还原过程中较适宜的粒度范围. 相似文献