In order to fully grasp the adaptability and grinding characteristics of semi-coke on different mill systems

the blending test of semi-coke on medium-speed mill and ball mill was carried out

and the theoretical calculation results and the actual grinding capacity of the mill were compared.The effects of coal quality parameters

coal powder fineness and coal powder moisture on the theoretical calculation of semi-coke's grinding capacity were analyzed.The results show that

for any type of the mill

the grinding capacity decreases and the coal powder fineness becomes coarse after grinding the semi-coke

this is mainly related to the low HGI value of the semi-coke itself.The actual grinding capacity of the semi-coke is lower than the calculated output of medium-speed mill

while the high moisture is also the main reason leading to the results on the ball mill.The semi-coke with low moisture has a different conclusion

and the actual grinding capacity is basically equals to the calculated output on ball mill.It suggests that

to improve the safety and economy of the boiler

the semi-coke be blended in the power plant which burning coals with low HGI value or with a larger grinding capacity mill.