Influence of particle size on combustion behavior of bamboo char used for blast furnace injection  

作　　者：Run-sheng Xu Wei Wang Bo-wen Dai 

机构地区：[1]State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology, Wuhan 430081,Hubei,China [2]Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2018年第12期1213-1222,共10页

基　　金：the financial-support from the China Postdoctoral Science Foundation (2016M602378);National Natural Science Foundation of China (Nos.51704216 and U1760101).

摘　　要：The combustion behavior of bamboo char and its relationship with particle sizes were evaluated using thermo-gravimetric analysis.The results showed that the combustion properties of bamboo char were much better than those of the anthracite used as a coal injected for blast furnace ironmaking due to its porous structure,disordered microcrystalline and higher catalytic index of ash minerals.When the particle size increased from -0.074 to 0.500-1.000 mm,the ignition temperature and burnout temperature of bamboo char increased,while the combustible index and comprehensive combustion characteristic index decreased slightly.The apparent activation energies of non-isothermal combustion of bamboo char and anthracite were calculated based on the distributed activation energy model.The results showed that the average activation energy was 162.86 kJ/mol for-0.074 mm anthracite,while it ranged from 71.01 to 89.44 kJ/mol for bamboo chars of different sizes.It revealed that the combustion reactivity of bamboo char in the largest size (0.500-1.000 mm)was much better than that of -0.074 mm,anthracite;thus,the size of biomass char could be enlarged to the maximum size specified by the injection application of blast furnace.

关 键 词：BAMBOO CHAR BLAST FURNACE INJECTION Particle size Combustion characteristics KINETICS 

分 类 号：TF[冶金工程]