Comparative analysis of pyrolysis characteristics and semi-coke characteristics of representative coal from main producing areas of semi-coke
The basic coal quality characteristics of representative coal samples from four semi-coke producing areas in Shaanxi,Inner Mongolia and Xinjiang were investigated.The pyrolysis characteristics and yield distribution of coal samples were compared and analyzed.The microstructure,combustion performance and grindability of semi-coke obtained by pyrolysis of different coal samples were studied.The results show that the pyrolysis efficiency of low rank coal in each semi-coke producing area is quite different.With the deepening of coalification degree,the pyrolysis reactivity of coal decreases gradually.Hami coal with lower coalification has higher tar yield.There is a positive correlation between hydrogen content in pyrolysis gas and H/O of raw coal.The specific surface area of low rank coal pyrolysis semi-coke in each semi-coke producing area is quite different,but the distribution of pore morphology is similar.The low degree of coalification of raw coal leads to a high degree of disorder of carbon structure of semi-coke.The grindability of Hami semi-coke is poor,but the combustion reactivity is the best.The grindability of semi-coke is better than the other two places.The physical and chemical properties of semi-coke in different regions are obviously different,and the best utilization way of semi-coke should be sought according to the downstream demand.
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