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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >The effect of particle size on the rate and depth of moisture evaporation from coal stockpiles
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The effect of particle size on the rate and depth of moisture evaporation from coal stockpiles

机译：粒度对煤炭蒸发速率和深度的影响

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Excessive amounts of moisture in product coal can influence the efficiency of downstream utilization processes due to a decreased calorific value and handling problems. Stockpiles can be used to decrease the moisture content of coal by means of gravity drainage and evaporation. This paper is focused on the evaporation of moisture from a coal stockpile surface with the aim of investigating the effect of particle size on the rate of evaporation as well as the depth to which evaporation extends.It was observed that moisture initially evaporates at a higher rate from a stockpile consisting of fine particles (-6.7 mm) than from coarser particles (-13.2 mm +6.7 mm). This high rate of evaporation is restricted to the outer shell of the fine coal stockpile. However, for coarse coal, the porous nature increases the depth at which evaporation occurs. Evaporation of moisture was observed up to the fourth day of each experimental run, after which steady state was obtained. It was shown the water can evaporate from the surface into the body of the stockpile, depending on the coal particle size and void spacing. An experimental reclaim depth of 0.4 m was achieved after 4 days.
机译：由于发热值降低和处理问题，产品煤中水分过多的水分可以影响下游利用过程的效率。库存可用于通过重力引流和蒸发降低煤的水分含量。本文的重点是从煤储存表面蒸发水分，目的是研究粒度对蒸发速率的影响以及蒸发延伸的深度。观察到水分最初以更高的速率蒸发来自由细颗粒（-6.7mm）组成的股票而不是粗颗粒（-13.2mm +6.7mm）。这种高蒸发速率仅限于细煤炭储存的外壳。然而，对于粗煤，多孔性质增加了蒸发的深度。在获得稳定状态之后，观察到蒸发水分的蒸发到每个实验运行的第四天。它被示出了水可以从表面蒸发到储存体中，这取决于煤颗粒尺寸和空隙间距。在4天后实现0.4μm的实验回收深度。

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