Effects of fractal pore on coal devolatilization

摘要

Coal devolatilization is numerically investigated by drop tube furnace and a coal pyrolysis model (Fragmentation and Diffusion Model). The fractal characteristics of coal and char pores are investigated.Gas diffusion and secondary reactions in fractal pores are considered in the numerical simulations of coal devolatilization,and the results show that the fractal dimension is increased firstly and then decreased later with increased coal conversions during devolatilization. The mechanisms of effects of fractal pores on coal devolatilization are analyzed.