Abstract: Semi-coke is a product obtained from dry distillation of raw coal，and is of high calorific value and low volatile
content. At present，semi-coke，as a by-product of coal chemical industry，has not been fully utilized.Studying the blending
and co-combustion of semi-coke with pulverized coal will improve its economic benefit. However，the difficulties of the co-
combustion lay on the poor ignition conditions，low burnout rate and high NOx emission.In the study on co-combustion of
pulverized coal blended with large-proportion semi-coke，the effect of coal powder feeding method，blending ratio and
secondary air distribution on the temperature field，NO mass fraction field and CO mass fraction field in a furnace was
analyzed by numerical simulation.The results show that the optimal blending ratio of semi-coke is 40%；under the condition
of even air and powder distribution. When the fuel is stratified，the semi-coke arranged on the upper part of the burner will
make furnace temperature and NO mass fraction soar ，which can be improved by optimize the secondary air distribution .

Key words: semi-coke, large-proportion blending, numerical simulation, powder feeding method, blending ratio,
secondary air distribution, NOx emissions