NaOH 水溶液-CO_2 系モデルによる気泡群-液間の反応効率

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The gas bubble swarms has been applied as and effective means to the gas-melt reaction in many steel making processes such as the oxygen blow in electric furnace, or bottom blown oxygen converter operations. There have been, however, few fundamental studies available for understanding of the process because of the difficulty of estimation of gas bubble characteristic which is thought to be a basic factor for the reaction efficiency. Standing on this viewpoint, this study has been undertaken to clarify the influences of operation or vessel design at on this viewpoint, this study has been undertaken to clarify the influences of operation or vessel design conditions on the efficiency of gas-liquid reaction, mainly aiming at the bottom blown converter process, by applying the experimental technique of chemical engineering. The model test of NaOH solution-CO_2 gas bubbles was conduted in the range of (Re)_n=10^3∿10^4 and the effects of the gas blow rate, nozzle conditions, depth of liquid, directions of blowing etc. on the volumetric mass transfer coefficient A_<KL> were investigated by the continuous measurement of PH in solution. The results are summarized as follows : (1) The diameter of nozzle, d_0 had little effect of A_<KL>, and A_<KL> was proportional to the gas blow rate V_m as expressed as A_<KL>=β.V_m 0.65 where β is a constant of proportionality. (2) When the number of nozzle was increased, A_<KL> per one nozzle was decreased. This phenomenon may be explained by the cell model that the bulk is divided into the cells ruled by the number of nozzle. (3) The effects of the liquid depth and end effect on A_<KL> were qualitatively illustrated for each bottom, side, top blowings. Finally, the application of experimental technique of chemical engineering to the metallurgical research and the application of the present model teet to practical problems were discussed.
社団法人日本鉄鋼協会の論文
1977-01-01

NaOH 水溶液-CO_2 系モデルによる気泡群-液間の反応効率

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