Simulation of coal pyrolysis in plasma jet by CPD model

Reaction of coal in a plasma jet is complex and extremely rapid, and acetyl ene and carbon monoxide are the main products in the pyrolysis gas. Coal py rolysis is assumed as the first step reaction when coal is injected into ho t plasma jet with initial average temperature of 3700 K. Chemical percolati on devolatilization (CPD) is employed first to simulate this procedure in m echanism. The calculation results indicate coal pyrolysis rate in plasma je t is very fast and the retention time of coal staying in reactor is only se veral milliseconds. Comparing the calculation with experiment result, it wa s concluded that the CPD agree with the experiment well when the coal feed rate is larger than about 2.0 g s(-1). As the coal feed rate was increased, the average temperature of coal particle during staying in reactor was red uced and the residual time became long, but it was not found that the resid ual time influenced the coal conversion evidently.