To explore a NO reduction technology of coal-fired industrial boilers with high efficiency and low cost

the applewood pyrolysis char and pyrolytic semi-char which are suitable for industrial applications were used as reducing agents

and the effect of microwave on the two samples reducing NO was studied in a microwave reaction system. For explaining the NO reduction experiment results

the infrared temperature measurement experiment

and the physical and chemical properties such as pore structure and TG reactivity was studied. The results show that

compared with the pyrolytic semi-char

the pore structure of applewood pyrolysis char is more developed with higher BET specific surface area and pore volume

it also ignites earlier

the combustion reaction rate reaches its maximum earlier and burns out first. However

its combustion intensity

reaction ability of earlier stage

flammability and combustion performance are weak. When the microwave is not applied

the NO reduction ability of applewood pyrolysis char is stronger than that of pyrolytic semi-char. Both the two samples have better NO reduction ability with microwave applying

and with the increase of microwave power

the NO reduction rate increases. The effect of microwave on pyrolytic semi-char reducing NO is stronger than that of applewood pyrolysis char. Meanwhile

infrared temperature measurement that the surface temperature of two samples both increases confirms that the microwave has an obvious thermal effect which could promote the NO reduction by char.