The coke produced by coal conversion chemical process contained high calorific value

however

the coke was treated as solid waste for the lack of downstream industry in Zhundong area. Blending the coke into Zhundong coal during combustion process will recovery a lot of energy. Nevertheless

the combustion characteristics of coal mixed with coke is still ambiguous. In this paper

the combustion characteristics of Zhundong coal and coke with different particle size rages

and that of the Zhundong coal blended with coke with different particle sizes and proportions were experimentally studied by thermogravimetric analyzer. The results indicated that

the ignition temperatures of Zhundong coal unchanged after the coke powder was co-fired. On the contrary

the burnout temperature of the mixed coal sample became higher than that of the pure Zhundong coal. The ignition temperature of the mixed sample is about 100 ℃ lower than that of the coke particles. When the particle size of coke was larger than 150 μm

the combustion characteristics of the mixed coal sample worsened dramatically

it changed linearly with the increasing blending ratio. It suggests that

during the combustion process in full-scale boiler

the particle size of the coke should be reduced. Furthermore

the coke powder should be sent into the furnace via the lower layer burners

to reduce the height of flame core and prolong the combustion time of the coke podwer.