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首页> 外文期刊>Coke and chemistry >The Operational Efficiency of Centrifugal Units in Coal Beneficiation
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The Operational Efficiency of Centrifugal Units in Coal Beneficiation

机译：选煤厂离心机的运行效率

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Analysis of the dependence of the index E_(pm) on the load for heavy-media hydrocyclones of various sizes and modifications (two- and three-product hydrocyclones of diameters 150, 500 and 750 mm) has demonstrated the steady character of the curves, which is called "load stability" by the authors. New perspectives are open for the wide application of heavy-media hydrocyclones with respect to nominal (certificate) and much higher loads.The efficiency of separation of the material as a function of coal size for centrifugal processes studied is described by the following relation:E_(pm) =Ad~(-0.3)The dependence of the efficiency of coal cleaning on the separation density has the form of a curve of "load stability"; its character substantially depends on the design of the hydrocyclone (the shape of the separation chamber), which plays an essential role in the choice of the operating regime of the vessel (in the zone of low or high separation density).Upon separation of coals with a high content of close-density fractions (from 10 to 80 percent) there is observed a considerable amount of the concentrate together with the thickened product. In order to reduce the loss of the concentrate, use should be made of hydrocyclones with devices for the recleaning of the thickened product, which makes it possible to increase the yield of the concentrate and to reduce its ash content (for example, use should be made of hydrocyclones with an annular shelf).
机译：分析指数E_（pm）对各种尺寸和变型的重介质水力旋流器（直径为150、500和750 mm的两种和三种产品的水力旋流器）的负荷的依赖性，证明了曲线的稳定特性，这被作者称为“负载稳定性”。对于重介质水力旋流器在标称（证书）和更高负荷方面的广泛应用，开辟了新的视角。通过以下关系描述了材料分离效率与所研究的离心过程中煤大小的函数关系： （pm）＝ Ad〜（-0.3）。洗煤效率对分离密度的依赖性为“负荷稳定性”曲线。其特性在很大程度上取决于水力旋流器的设计（分离室的形状），这在选择容器的工作方式（低或高分离密度区域）中起着至关重要的作用。在高密度部分（10％至80％）的情况下，观察到大量浓缩物和增稠产品。为了减少精矿的损失，应使用旋流器和增稠产品的再清洁设备，这样可以提高精矿的收率并减少其灰分（例如，应使用由带有环形架子的水力旋流器制成）。

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