高炉レースウェイ近傍の粉コークスの堆積挙動からみた適正羽口風速(高炉内現象)(<特集>製銑技術の拡大と高度化)

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Using a two-dimensional model of the lower part of a blast furnace and a raceway hot model, the formation of raceway and furnace core and the coke degradation have been studied to clarify the desirable blast velocity of a blast furnace. The results obtained are summarized as follows. (1) The reliable raceway penetration D_R(m) is derived as shown by the equation below, and it is estimated that the penetration in large blast furnaces is about 1.4m. D_R=5.00 D_t・u_t√<(P_b+1)/{ρ_c・d_p・(T_b+273)}> In the equation, D_t is tuyere diameter (m), u_t is blast velocity (m/s), P_b is blast pressure (kgf/cm^2, gage), ρ_c is apparent density of coke (kg/m^3), d_p is mean size of coke (m), and T_b is blast temperature (℃). (2) The amount of fine coke deposit in the raceway increases to a great extent and the temperature in the lower part of a blast furnace decreases when the raceway penetration exceeds 1.3m. (3) The upper limit of blast velocity u_t (m/s) is estimated by the equation under below any conditions of equipments and operations of a blast furnace. According to the calculation based on this equation, the decrease of blast velocity in about 30m/s causes the reduction of the raceway penetration of 0.1m, and blast velocity should be decreased in inverse proportion to productivity when productivity increases. u_t≨920(804-M_b)・ρ_c・d_p・N_t・D_R^2/(γ・υ_p・V_i) In this equaiton, M_b is blast moisture (g/Nm^3), ρ_c is apparent density of coke (kg/m^3), dp is mean size of coke (m), N_t is number of tuyeres (-), D_R is raceway penetration (m), γ is productivity (t・d^<-1>・m^<-3>), υ_p is blast volume per ton of hot metal (Nm^3/t), and V_i is inner volume of a blast furnace (m^3).
社団法人日本鉄鋼協会の論文
1987-11-01

高炉レースウェイ近傍の粉コークスの堆積挙動からみた適正羽口風速(高炉内現象)(<特集>製銑技術の拡大と高度化)

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