复合型煤泥旋流器分级分选规律的研究
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摘要
本文介绍了当前选煤厂常用的煤炭洗选方法及各方法的特点,详细分析了煤泥的洗选回收工艺及各工艺的优缺点,在此基础上,结合水力旋流器分级原理及水介质旋流器分选原理,提出了一种集分级与分选功能于一体的复合型煤泥旋流器。详细分析了水力旋流器的分级原理及水介质旋流器的分选原理,进而分析了复合型煤泥旋流器的分级分选原理。利用Fluent6.3软件对复合型煤泥旋流器流场进行了数值模拟,详细分析了旋流器内流场不同位置切向速度、轴向速度及径向速度的分布。根据复合型煤泥旋流器分级分选原理及流场数值模拟结果,对旋流器结构进行了探索性设计,并进行了加工制造。建立了试验系统,利用大屯选煤厂煤样,对复合型煤泥旋流器分级分选功能进行了验证性及探索性试验研究,得出复合型煤泥旋流器在所采用的参数条件下,具有明显的分级分选作用,但分级分选效率偏低。另外,提出若将复合型煤泥旋流器与后续作业脱泥筛结合起来,对其分级分选效果进行分析,分级分选效果很好,有很好的应用前景。
Coal separation technologies and their characteristics are introduced, coal slime separation and recovery technologies and their advantadges and disadvantages are analysed in detail, and so composite slime cyclone is put forward on the basis of the classification principle of hydro-cyclone and the separation principle of hydro-medium cyclone, which own classification and separation performances. The classification principle of hydro-cyclone and the separation principle of hydro-medium cyclone are analysed detailedly, then the principle of composite slime cyclone is introduced. With the Fluent6.3, the flow field in composite slime cyclone is simulated, and the tangential、axial and radial velocities in different spaces are analysed in detail. According to the classification and separation principle of composite slime cyclone and the results of the simulation, the structure is designed exploringly and maded. The experimentation system is structured, with the coal example of Da tun plant, the classification and separation performance is studied experimentally and exploringly, the result is that the classification and separation is obvious, with the diameters odopted by the paper, but the efficiency of the classification and separation is low. Additionally, combining the de-sliming screen of posterior process to analyse, the classification and separation result is very good, and composite slime cyclone has a good utilization prospect.
Coal separation technologies and their characteristics are introduced, coal slime separation and recovery technologies and their advantadges and disadvantages are analysed in detail, and so composite slime cyclone is put forward on the basis of the classification principle of hydro-cyclone and the separation principle of hydro-medium cyclone, which own classification and separation performances. The classification principle of hydro-cyclone and the separation principle of hydro-medium cyclone are analysed detailedly, then the principle of composite slime cyclone is introduced. With the Fluent6.3, the flow field in composite slime cyclone is simulated, and the tangential、axial and radial velocities in different spaces are analysed in detail. According to the classification and separation principle of composite slime cyclone and the results of the simulation, the structure is designed exploringly and maded. The experimentation system is structured, with the coal example of Da tun plant, the classification and separation performance is studied experimentally and exploringly, the result is that the classification and separation is obvious, with the diameters odopted by the paper, but the efficiency of the classification and separation is low. Additionally, combining the de-sliming screen of posterior process to analyse, the classification and separation result is very good, and composite slime cyclone has a good utilization prospect.
引文
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