微波作用下的细粉煤脱水研究

在煤炭开采和加工工业中 ,泥煤的脱水问题变得越来越重要。改进细粉煤脱水效果的方法主要有物理方法和化学方法两类。现有的物理方法主要是提高过滤压力 ,使滤饼的结构变得致密 ,从而挤出其中的水分 ;微波加热脱水是指煤饼中的极性分子水在微波场的作用下快速摆动 ,产生类似于摩擦的作用 ,而以热的形式表现出来 ,使水分蒸发1] 。本文是在微波加热条件下 ,探讨了微波对脱水效果的影响以及微波脱水的最佳工艺条件。1　实验部分1 1　原料　实验样品为朱仙庄气煤、山家林肥煤、西曲焦煤、青龙山瘦煤。其工业分析见表 1,其中空气干燥基水分为块…

STUDY ON THE EFFECT OF THE MICROWAVE ON THE DEWATERING OF FINE COAL

The coal water slurry with different concentrations was prepared using 4 different kinds of coal (gas coal, fat coal, coking coal and lean coal) and dewatered using microwave The effect of coal particle, rank, strength and irradiation time of microwave on the moisture content of the filter cake was investigated In addition, the dewatering efficiency using microwave and electronic heat under same power and time was compared The results show that the moisture content of the coal cake depends on the particle size and coal rank The fine coal has higher water content in its cake With increasing coal rank, the moisture content in the cake decrease and then increase and the coking coal cake has the lowest value With increasing irradiation time, the water content of the cake with different rank and particle size tends to be same The water content in the cake decreases with the enhancement of the microwave strength, but has no effect on the relationship between the water content and the gronularity Compared with electronic heating, microwave decrease dewatering time, therefore, decrease energy consumption and improve efficiency