Sintering behavior of combusted iron powder in a packed bed reactor with nitrogen and hydrogen  

作　　者：C.J.M.Hessels A.H.J.Smeets G.Finotello N.G.Deen Y.Tang 

机构地区：[1]Power and Flow Group,Department of Mechanical Engineering,Eindhoven University of Technology,PO Box 513,5600MB,Eindhoven,the Netherlands [2]Eindhoven Institute for Renewable Energy Systems(EIRES),PO Box 513,5600MB,Eindhoven,the Netherlands

出　　处：《Particuology》2023年第12期8-17,共10页颗粒学报（英文版）

摘　　要：Sintering behavior of micron-sized combusted iron powder is studied in a packed bed reactor,at various temperatures under inert(nitrogen)and reducing(hydrogen)conditions.Compression tests are subsequently used to quantify the degree of sintering.A sintering model,based on the formation of a solid bridge through solid state surface diffusion of iron atoms,matches the experimental results.Sintering of combusted iron occurs at temperatures≥575°C in both nitrogen and hydrogen atmospheres and increases exponentially with temperature.The observed decrease in reduction rate at high temperatures is not caused by the sintering process but by the formation of wüstite as an intermediate species,leading to the formation of a dense iron layer.Iron whiskers form at high temperatures(≥700°C)in combination with low reduction rates(≤25 vol%H2),leading to the production of sub-micron fines.

关 键 词：Metal energy carrier Combusted iron WHISKERS Solid bridge force SINTERING 

分 类 号：TF55[冶金工程—钢铁冶金]