影响烟煤黏结指数准确性的因素研究

Influencing factors of bituminous coal caking index

烟煤黏结指数是表征烟煤黏结性的重要参数,直接影响煤的结焦过程,因此准确测定烟煤黏结指数尤为重要.分析了煤样制备、检测和保存时,不同操作参数和方法对烟煤黏结指数准确性的影响.结果表明：使用普通干燥箱在40℃条件下干燥煤样时,应保证煤样达到空气干燥状态,煤样中0.1～0.2 mm质量分数应达到20％ ～ 35％;煤样检测时,应使用合格坩埚,并保证压块完好,加热煤样时应将坩埚架放置在马弗炉加热区域;待测煤样应置于密封瓶保存,且保留时间不超过7d.各因素对不同变质程度煤样黏结指数的影响不同,高变质程度煤样影响较小,低变质程度煤样影响较大.

Caking index represent the caking properties of bituminous coal,which influence the coking properties.Analyse the influence of different operating parameters and methods on caking index in the process of coal sample preparation,test and preservation.The results show that,when drying coal sample at 40 ℃ using common drying oven,the coal sample should be in air drying state.The mass fraction of 0.1 mm to 0.2 mm size fraction should reach 20 percent to 35 percent.In the process of detection,the coal sample should be in good condition,and adopt qualified crucible which should be placed in the heating area of muffle.The storage time in sealed bottle are seven days at most.The influencing factors affect greatly the high metamorphic coal and has no significant effect on low metamorphic coal.