In an entrained flow reactor

the behavior of coal chars prepared from four coal sorts under different reaction conditions have been studied

the effects of coal sorts

pyrolysis condition(i.e.pyrolysis temperature

particle size and atmosphere under pyrolysis)

and reaction conditions(including reaction temperature and ambient atmosphere etc) upon behavior of coal char in reduction of NO being analysed.Results show that the efficiency of NO redution increases along with increasing volatile matter in coal sort;the enhancement of pyrolysis temperature leads to decrease the reduction ability of the produced coal char;the reduction rate of coal char produced from pulverized coal with small particle size is higher than that from larger particle size;when pyrolysis of pulverized coal is in the primary combustion zone and in an atmosphere of excess air coefficient to be 1.0~1.2

the coal chars produced haven't obvious difference in ability of NO reduction;the particle size of coal char participating into reaction and the ambient atmosphere of flue gas have larger effect upon ability of coal char in reduction of NO;in the event of stoichiometric ratio=0.9~1.3

the efficiency of NO reduction appears high at two ends

and low at the middle

the efficiency to be minimum at SR1=1.1;in high temperature oxidative atmosphere

the efficiency of NO reduction increases along with the reaction temperature.