NaOH水溶液へのCO₂吸収の速度に及ぼすガスジェット特性の影響

抄録

In the gas-melt reactions which proceed by gas jet with molten metal, it is well-known that the mass transfer is greately influenced by the behaviour of gas jet imping on liquid surface, therefore, lancing con ditions are the important factor to control the reaction efficiency. There are, however, few studies which show quantatively the mass transfer from gas jet to liquid in accordance with lancing conditions.
Standing on this view point, this study has been directed for presenting an equation model which is capable of estimating the absorption efficiency of gas through the NaOH-CO₂ gas jet model. An equation model expressing the relationship between the apparent rate constant and the behaviour of gas jet has been introduced as follows: AV·k_L=dV_m²·d₀^-2 (H_O+ H_C) ^-1=α′M_j (H_O+H_C) ^-1whereA-surface area of bath, V=volume of liquid, k_L=apparent rate constant, V_m=volumetric gas flow rate, d₀=nozzle diameter, H_O=distance between the nozzle and the liquid surface, H_C=depth of crater formed by gas jet, α, α′=constant of proportionality, M_j=momentum of gas jet, respectively.
The values of the apparent rate constants K_L in the H₂O-CO₂ absorption model by BRADSHAW et al. have been reviewed according to the present equation model and the validity of the equation has been confirmed. The practical application of the present model to the VOD process for stainless steel making has been also discussed.