变温条件下煤结构与吸氧量的关系

采用压汞法技术定量测定了在不同温度与压力下煤样的孔径、孔容积与煤的表面积的值；用分形理论对煤在定压变温条件下结构参数进行分形特征描述，并对用孔径与孔容两种分形维度的值表示煤的孔隙结构的合理性进行了比较.当煤温<100 ℃时，煤的容积分形维数增大，吸氧量增加，孔隙容积对煤的吸氧量起主要作用；当煤温≥100 ℃时，煤的分形维数减小，煤的吸氧量也增加，这是由于煤的吸氧量主要是氧化反应速率决定的，孔隙结构特征对煤的吸氧量影响很小.

Relation between coal structure and absorbed oxygen at different temperatures

Pore diameter in coal samples, its cubage and surface area at different temperatures and mercury press acting on the pores were measured by mercury porosimetry method. Based on fractal dimensions theory, parameters describing fractal dimensions characters of coal were got at certain mercury press and temperature. Reasonability of pore structures described by two fractal dimensions, pore diameter in coal samples and its cubage, were compared. When temperature is less than 100 ℃, fractal dimensions of pore cubage in coal sample increases and oxygen absorption increases as well. When temperature is more than and equal to 100 ℃, fractal dimensions of pore cubage in coal sample decreases and oxygen absorption increases. It’s because of oxygen absorption in coal sample mainly decided by oxidation reaction rate and small influence of pore structure on oxygen absorption. 