VOD过程传质数学模拟研究

MATHEMATICAL MODELING OF MASS TRANSFER IN VOD PROCESS

用 NaOH—CO_2体系对 VOD 过程和 O_2的利用率进行了模拟实验研究。认为气—液反应速度由液侧扩散传质控制,并建立了数学模型.本模型的计算值与实验值基本相符。

The mass transfer coefficient of oxygen and its utilization ratio for VOD processing are investigated with NaOH—CO_2 System.It is considered that the reaction rate in the gas—liquid system is dominated by diffusion through liquid-side,and a mathematical model of mass transfer is establi- shed.The relationship between physical and chemical processes is established mathemetically in this model.Diffusion layer,the width of which is inver- sely proportional to the rate of mass transfer,depends on liquid flowing property.It is proved that values calculated by use of this model are in good agreement with exprimental data.The lower the vacuum,the faster the rate of mass transfer,the larger the gas flow rate of the bottom-blowing,the faster the rate of mass transfer,and the lower the lance location,the fas- ter the rate of mass transfer.The references for selecting reasonable jet conditions has been proposed by this model.