Effect of H2 O(g)Content in Circulating Flue Gas on Iron Ore Sintering with Flue Gas Recirculation

摘要

The influence of H2 O (g)content in circulating flue gas on sintering was studied by simulating the flue gas circulating sintering.The results show that the burning speed of solid fuel and the heat transfer rate during sintering process are improved when the H2 O (g)content increases from 0 to 6%,which accelerates the sintering speed. However,when the H2 O (g)content exceeds 6%,the over-wet zone in sinter bed is thickened,which deteriorates the permeability of sintering bed.In addition,the magnetite content in sinter increases,while the acicular calcium ferrite content decreases.Accordingly,the sinter yield and tumble index decrease with excessive H2 O (g)content. To guarantee the yield and quality of sinter,the favourable H2 O (g)content in circulating flue gas should be con-trolled to be less than 6%.