ABSTRACT

The performance of a coal cleaning gravity separator is represented by plotting the partition curve, which is otherwise known as the Tromp curve. From this curve, the two performance parameters estimated are the specifics gravity of separation (SG₅₀) and the sharpness of separation (E_P). For a given washing unit, when a family of such curves is plotted against a normalized specific gravity (SG/SG₅₀) on to a single graph, a unified curve obtained is known as generalized partition curve, which is considered as the characteristic plot of that washing unit representing overall performance at varied conditions of operation. However, for prediction of the performance of the separator under new conditions, it is necessary to define the generalized partition curve by a suitable mathematical expression, besides using several mathematical correlations for prediction of yield and ash. All this is a tedious task and time consuming too. In the present paper, to simplify this conventional approach, the partition data of the individual experiments have been directly represented by Rosin–Rammler model, and its suitability to predict the yield of clean has been established by comparing with other models for the performance data of 76-mm-diameter dense medium cyclone and a Vorsyl separator.

摘要

煤清洁重力分离器的性能通过绘制分配曲线来表示，也称为 Tromp 曲线。根据该曲线，估计的两个性能参数是分离比重(SG ₅₀ ) 和分离锐度(E _P )。对于给定的洗涤单元，当将一系列此类曲线与归一化比重 (SG/SG ₅₀ ) 绘制到单个图上时，所获得的统一曲线称为广义分配曲线，它被认为是该洗涤单元的特征图，代表了在不同操作条件下的整体性能。然而，为了预测新条件下分离器的性能，除了使用几个数学相关性来预测产量和灰分外，还需要通过合适的数学表达式定义广义分配曲线。所有这些都是一项乏味的任务，也很耗时。在本文中，为了简化这种常规方法，将单个实验的分区数据直接用 Rosin-Rammler 模型表示，并通过与其他模型的性能数据比较，建立了其预测清洁产率的适用性。直径 76 毫米的重介质旋风分离器和 Vorsyl 分离器。