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Based on the principles of mass,momentum and heat transfers between the reducing gas and the iron ore solid,a two-dimensional mathematical model for above two phases is established to study the influences of reducing gas composition on thermal and reduction conditions in pre-reduction shaft furnace with the temperature ranging from 1 023 to 1 223 K.Due to the strong endothermic effect of iron ore reduction participated by hydrogen (H_2),increasing the ratio of carbon monoxide(CO)to H_2 enlarges high temperature zone under present calculation conditions,thus improves reduction efficiency inside the furnace.In addition,replacing of the reducing gas with an appropriate proportion of nitrogen(N_2)featuring the same temperature has a potential to reduce fuel consumption by as much as 6.5%while the products of similar quality are yielded.
Based on the principles of mass, momentum and heat transfers between the reducing gas and the iron ore solid, a two-dimensional mathematical model for above two phases is established to to study the influences of reducing gas composition on thermal and reduction conditions in pre-reduction shaft furnace with the temperature ranging from 1 023 to 1 223 K. Due to the strong endothermic effect of iron ore reduction participated by hydrogen (H_2), increasing the ratio of carbon monoxide (CO) to H_2 enlarges high temperature zone under present calculation conditions , 改善 的 降低 效率 在 该 炉. Additional, the reducing gas with an appropriate proportion of nitrogen (N_2) featuring the same temperature has a potential to reduce fuel consumption by as much as 6.5% while the products of similar quality are yielded.