部分气化后半焦的孔隙结构

【摘要】 用氮气等温吸附(77K)的方法测量了原煤及加压、常压部分气化后半焦的BET比表面积。并利用BJH法计算了孔比表面积、孔容、孔径和孔分布。结果表明,原煤在转化为半焦的过程中,孔隙结构变得发达,比表面积明显增大;半焦的孔比表面积和孔容积分布曲线存在两个明显的峰值,部分气化后的原煤2nm左右的微孔及中孔会较大幅度地增加,3.8nm左右的中孔有进一步的扩展,且该孔径占主导地位。更多还原

【Abstract】 The coal-char samples from atmosphere and pressurized gasification were measured by nitrogen adsorption at 77K.Their specific surface areas were determined on the basis of BET model.The average pore size, total pore volumes,pore specific surface areas and pore size distributions were also statistically obtained by using BJH theory.The results showed that there were more pores and larger specific areas after gasification, the coal-chars’ distribution curves existed two sharp humps which indicated that some 2nm mircopores and mesopores increased apparently and some 3.8nm mesopores-possessing mostly in chars extended.更多还原