A new type of tar trap was applied to modify the electrically heated grid reactor

which efficiently enhanced the tar collection efficiency and repeatability.Parolysis test was performed on this improved electrically heated grid reactor

for subbituminous coal

high and low volatile bituminous coal.The yields of volatiles

tar and residual extracts of coal particles were obtained.The results show that

an increase in heating rate shifted the pyrolysis to higher temperature zone

enhanced volatile and tar yield and the proportion of tar in volatile.As expected

the extract yields during pyrolysis decreased.