To study the ignition characteristics of coal and coal-char particles with different volatile contents under the condition of limiting the secondary reactions between volatiles and coal-char particles and the "stacking effect" of coal particles

a lignite and a bituminous coal with different volatile contents were selected to carry out ignition experiments on a self-built wire-mesh reactor.Moreover

ignition experiments were also conducted on conventional thermal gravimetric analyzer for comparason.The results show that

the volatile contents have the greatest effect on ignition temperature of the pulverized coal.With the increase of volatile contents

the ignition temperature of pulverized coal gradually decreases.Due to the reduction of the "stacking effect" of samples and the reduction of volatile combustion during heating process

the ignition temperature measured by wire-mesh reactor is higher than that obtained by thermogravimetry

which is closer to the actual ignition temperature of pulverized coal particles.The reactivity of lignite is higher than that of bituminous coal

and the ignition temperature of coal-char is lower than the original

but the increase of specific surface area and pores of coal-char samples make it suitable for adsorption study.