焦煤配煤挥发分与黏结指数的相互关系

Relation between volatiles yield and caking index of blending coal from coking coal

为研究焦煤配煤的挥发分和黏结指数之间的相互关系,以强黏结性的焦煤与2种弱黏结性煤(贫瘦煤和弱黏煤)为试验煤样进行配煤试验,通过测定配煤的挥发分和黏结指数研究配煤的黏结指数和挥发分之间的关系。结果表明:当焦煤中配入贫瘦煤或弱黏煤时,配煤的黏结指数随焦煤配煤比的增大而呈弓形增大;焦煤配入贫瘦煤和弱黏煤制备的配煤挥发分的变化规律不同,呈相反变化趋势,焦煤和贫瘦煤配煤的挥发分随焦煤配煤比的增大呈线性增大,焦煤和弱黏煤配煤的挥发分则随着焦煤配煤比的增大总体呈下降趋势;焦煤中配入贫瘦煤时,配煤的黏结指数随配煤挥发分的增大呈非线性增加,当向焦煤中配入弱黏煤时,随配煤挥发分增加,配煤的黏结指数总体呈下降趋势。因此,采用焦煤与弱黏结性煤进行配煤时,配煤的黏结指数与配煤的挥发分之间存在相互关联性,但二者之间的关系与弱黏结性煤的煤质结构有关。

To research the relation between volatiles yield and caking index of blending coal from coking coal,a coking coal with strong caking properties and two coals(a meager lean coal and a weakly caking coal)with poor caking properties were selected as the experimental samples to conduct the blending coal experiment.The relation between volatiles yield and caking index of blending coal has been studied through the determination of volatiles yield and caking index of different blending coals.The results show that the caking index of the blending coal increases with the increment of the blending ratio of coking coal and the curves of the caking index against the blending ratio of coking coal take on an arcuate shape.The trends of volatiles yield of the two types of blending coal from the coking coal blended with the meager lean coal or the weakly caking coal are different,and both of the changing trends of volatiles yield from the two types of blending coal are opposite.The volatiles yield of the blending coal obtained from the coking coal and the meager lean coal increases linearly with the increment of the blending ratio of coking coal.On the contrary,the changing tendency of the volatiles yield of the blending coal obtained from the coking coal and the weakly caking coal overall decreases with the increment of the blending ratio of coking coal.When the meager lean coal is mixed with the coking coal,the caking index of the blending coal nonlinearly increases with the increment of the volatiles yield of the blending coal.Whereas the caking index of the blending coal overall falls with the increment of the volatiles yield of the blending coal obtained from the weakly caking coal and the coking coal.Consequently,when the coking coal is blended with the poorly caking coal,the caking index of the blending coal is related to the volatiles yield of the blending coal,and the relation between the caking index and the volatiles yield depends on the structure and the coal quality of the coal with poor caking properties.