旋流微泡浮选柱的研制及应用

旋流微泡浮选柱是一种新型、高效的细粒分选设备，可一次完成粗，精，扫选，选择性较好。利国铁矿铜，钴分离作业采用该设备进行了半工业试验，在同样分选条件下，不仅确保了铜的品位和回收率，而且使钴精矿的品位和回收率大幅度提高，具有较好的经济效益。     

Estimations of the Maximum Tangential Velocity V_(θm) in the Vortex Core Region and also the Mean Rotational Velocity V_(oi) near the Concave Wall Surface in the Returned Flow Type Cyclone Dust Collector

There are many types of cyclone dust collectors for separating the fine solid and dust particles from gases in the various industries and also in the home used purposes. For estimating the power loss and the collection efficiency, one of the most important factors is the maximum tangential velocity Vθm in the vortex core region in the cyclone body. In order to determine Vθm by the simple method, it is useful to apply the mechanical balance of the angular momentum fluxes under the assumption of Ogawa combined vortex model which is composed of the quasi-forced vortex in the vortex core region and also the quasi-free vortex surrounded the vortex core region and also under the assumption of the introduction of equivalent length Heq corresponding to the cone spaces of the cyclone body and the dust bunker. On the other hand, the mean rotational velocity Voi near the concave wall surface is also estimated by the mechanical balance of angular momentum fluxes with the moment of viscous friction force. For confirming the general applications of the obtained equations, the returned flow types cyclones changed the throat diameter D3 are designed. The material of the cyclone is the transparent acrylic resin. Therefore the inner surface of the cyclone body can be regarded as smooth surface. The comparisons of the measured velocities Vθm and Voi by a cylindrical Pitot tube are shown in good agreement with those of the proposed equations. The above stated results are described in detail.     

增大旋流器分级效率提高钼精矿质量的实践

在详细计算的基础上,找出了三十亩地选矿厂旋流器分级效率低的原因,并进行了适当改造,使旋流器分级效率明显提高,降低了精选段的人选粒度,满足了生产高品位钼精矿的要求.     

MINIMISATION OF NOx EMISSION BY FLAME TEMPERATURE CONTROL

Emission control technology has advanced to an extent whereby pollutant levels are now controlled by legislation. Techniques for controlling emissions vary and include improved fuel mixture preparation, multi stage combustion, exhaust gas recirculation, inhibitors such as ammonia and other techniques which reduce the intensity of combustion and hence flame temperature.

This paper examines ways in which ultra low NO_x, emission combustors can be produced by applying technology developed for burning poor quality fuels.     

在旋流扶正器作用下环空流场旋流衰减规律研究

在油气井固井注水泥顶替技术中，传统的一维轴向流顶替方式不能有效替净环空被顶替液；而使用旋流扶正器不仅提高套管居中度，还能使环空流体改变流速剖面而做螺旋运动，这使轴向驱替的同时增加一周向剪切驱动力，从而有利于将环空窄间隙滞留泥浆和井壁附着虚滤饼驱替干净,提高固井质量。文章对旋流扶正器本身结构、流体性能、施工排量与旋流发展之间的关系进行了较为全面的研究，研究得出的旋流周向速度的经验公式，计算精度较高，对计算边壁剪切应力，设计旋流扶正器的间距具有重要的意义。     

有杆泵井下油水分离系统设计

有杆泵井下油水分离系统由单作用液流泵、液一液旋流分离器和原油提升泵三部分组成。工作时,经旋流分离器分离,分离后的污水直接注入注水层,低含水原油经原油提升泵采出地面,达到了节能降耗的目的。在分析有杆泵井下油水分离系统工作原理的基础上,介绍了泵流量的理论计算公式。     

改进型旋风分离器的新应用

根据旋风分离器的工作原理及应用特点,分析了影响旋风分离器的因素及提出改进措施.在此基础上,结合气-液(雾沫、液滴)、液-液(油-水)两个非均相物系分离的特定场合,提出应用旋风分离器强化分离的方案.根据被分离物系的特性,给出了这两种改进型旋风分离器的设备设计参数.最后,将这两种改进型的旋风分离器成功地应用于特定的场合,较好地解决了原来两相分离不清及夹带现象.实践证明,对于密度差异较小的非均相物系的分离,只要认真分析物系特性及对旋风分离器作适当改进,仍能取得令人满意的效果,这大大拓宽了旋风分离器应用的领域.     

重介旋流器入口流道内颗粒冲击参数计算方法

针对重介质旋流器入口流道磨损的成因,分析了流态化颗粒的运动和对器壁的冲击力作用,提出了颗粒冲蚀参数计算的数学模型．结合煤炭重介分选的实际情况,计算了各种颗粒和旋流器结构参数,分析了其对冲蚀作用的实际影响,为旋流器的结构参数优化提供了理论依据．作为本次研究阶段性成果的工业化产品,在实际生产中表现出了很好的抗磨性能和令人满意的分选效果．     

旋风汽水分离器内液滴轨迹模拟研究

旋风分离器内部汽水两相流场是非常复杂的三维强旋转湍流流动,液滴运动非常复杂,且带有很大的随机性,因此很难通过解析的方法预报内部流动状况。使用fluent软件,运用计算流体力学的方法对旋风分离器内部的液滴流动进行了数值仿真研究。结果表明,小粒径液滴与较大的粒径的液滴相比,由相同位置进入,其运动轨迹有所不同。小粒径液滴受气流脉动影响和受大粒径液滴的携带作用较为显著,对分离性能的影响较大。所以,液滴粒径越大,分离效率越高。     

Characterization of multiphase gas–solid flow and accuracy of turbulence models for lower stage cyclones used in suspension preheaters

This study involved the analysis and characterization of the multiphase flow phenomenon inside the lower stage cyclone separator used in the clinker burning process. The analysis was performed using both CFD and experimental research methods. Very few studies are devoted to such types of cyclone separators, which in addition to their basic functions are also responsible for the technological process. Due to the atypical working conditions of these cyclone separators, they are characterized with a complex geometry, which significantly differs from that of the traditional separators.Furthermore, the evaluation of the accuracy and level of reliability of the two models of turbulence closure—k-e RNG and RSM(RANS), and the LES. The results obtained led to the conclusion that for the lower stage cyclone separators, the LES model proved to be the most accurate(both in the case of forecasting the separation efficiency and pressure drop). The performance parameter(in particular the separation efficiency) values obtained for the RSM model were also characterized by high accuracy. The k-e RNG model was characterized by significantly larger deviations.