摘要
采用低温氮吸附法获得印尼褐煤的吸附-脱附等温线,通过对比分析得到该煤种的内部孔隙特征.实验结果表明,印尼褐煤比表面积很大,尤其是存在大量的一端封闭一端开放的孔隙结构,这是其含水量高、易吸水回潮并不易脱水的主要原因.在一定的温度条件下对其进行轴向冲击挤压处理,褐煤内部的孔径分布特征没有发生较大改变,但对中、大孔的数量影响很大,特别是半封闭孔明显减少,整体比表面积大大降低,这种改质方法将对降低褐煤的含水量和吸水性有一定的意义.
Low-temperature nitrogen adsorption method （LTNAM） was used to detect the microspores of Indonesia lignite and the adsorption-desorption isotherms were obtained. The results from comparative analysis show that the coal has a large surface area. Particularly, there are a lot of semi-opened microspores. These two characters are the main reasons that lignite has high moisture and is hard to dewater. The method of axial impact in a certain temperature was used to update the lignite. The microspores distribution of the lignite was not changed apparently. However, the quantity of the meso-pores and macro-pores was decreased. Especially, the semi-open pores were reduced comparatively. So the overall surface area was reduced substantially. This upgrading method would have certain significance on dewatering the lignite.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2008年第7期799-802,共4页
Journal of China Coal Society
关键词
印尼褐煤
吸附
脱水
孔隙结构
Indonesia lignite
adsorption
dewatering
pore structure
