褐煤中水分存在形式的实验研究

EXPERIMENTAL INVESTIGATION ON EXISTENCE FORM OF WATER CONTAINED IN LIGNITE

利用低温差热法分析了我国内蒙古两种典型褐煤中水分的存在形式,并用恒温干燥的方法对褐煤中各部分水的析出情况进行了研究.结果表明,我国褐煤中存在三种具有不同冷凝特性的水,分别为自由水、束缚水和不冻水,其含量与煤种有关;从等温干燥实验得出,自由水的析出速率明显大于束缚水的析出速率;由不同存在形式水分含量及冷凝特性可以推测,大唐五间房褐煤具有比锡林郭勒褐煤更大比例的微孔,我国褐煤孔隙分布中的微孔所占体积比例比澳大利亚褐煤大.同时,通过孔隙测定验证了大唐五间房褐煤具有比锡林郭勒褐煤更大的微孔比例,且与其水分冷凝特性关系相符.

The existence forms of the water contained in the two kinds of the lignites from Inner Mongolia, China were investigated by the methods of low temperature differential scanning calorimetry and constant temperature drying. The results show that the lignites contain the water with three different congelation characteristics, free water, bound water and nonfreezable water and the content of three waters is closely related to coal type. It is also found that the drying rate of the free water is much greater than that of the bound water. According to the existence form and congelation characteristics of the water contained in the lignites, it can be inferred that Da- tang Wujianfang lignite possess a larger ratio of micropore volume to total volume than that of Xilingol lignite and the ratio of micropore volume of the Chinese lignite is larger than that of Australia lignite. Meanwhile, it is verified by the porosity analyzing result that the ratio of micropore volume of Datang Wujianfang lignite is greater than that of Xilingol lignite and the result is con