As a new boiler fuel

semi-coke has dramatic difference on grinding and abrasiveness property form the commonly burned coals

and the type selection of semi-coke mill can't be fulfilled just by theoretical calculation.To solve this problem

this paper experimentally investigated the grinding properties of the semi-coke

such as the grinding output

coal fineness and milling consumption

on a small scale semi-industrial ball mill.According to the test results

type selection for an ultra supercritical 660 MW coal-fired unit boiler burning pure semi-coke was performed.The results show that

the actual milling output of the ball mill grinding semi-coke is lower than the theoretical value

this conclusion can provide references for combustion and co-firing of semi-coke in coal-fired boilers.