煤焦在燃烧过程中孔隙结构变化的模拟

煤焦在燃烧过程中的物理特性，如比表面积和孔径分布会发生连续变化，直接测量煤焦在燃烧过程中的孔隙结构变化很困难，但可以通过合适的数学模型来观察，二维的圆柱孔模型已大量用来对煤焦气化与燃烧过程中表面积和孔隙结构的变化进行模拟，这个模型把孔隙分成两大部分－－大孔与小孔，因为小孔构成比表面的绝大部分，所以在反应过程中比表面积的变化可以由单一小孔模型来拟合，本文采用了用Ｔｓｅｎｇ和Ｅｄｇａｒ提出的孔模型对几

SIMULATION OF CHANGE OF PORE SIZE DISTRIBUTION IN COAL CHAR DURING COMBUSTION

The physical properties of coal char, such as surface area and pore size distribution, change continuously during gaschar reactions The measurement of physical properties of coal char during gasification or combustion is difficult and cannot be performed directly Instead, the change of pore structure in coal char can be analysed from the reaction data by using a suitable mathematical model A bifureated cylindrical pore model had been developed to simulate the change of the physical properties of coal char during gasification or combustion This model demonstrates that changes in the pore structure of coal char can be characterized by dividing the pores into micropores and macropores Because the micropores provide most of the char surface area, their change can be simulated by using a single size micropores model The pore model presented by Tseng and Edgar is used in this study The evolution of surface areas predicted by the bifureated pore model agrees well with the experimental data