RH-KTB顶吹氧吸收及脱碳过程的水模型

Water Modeling on Oxygen Absorption and Decarburization in RH-KTB Process

为深入了解RH-KTB真空精炼过程的传质现象,建立了与原型1∶5.5的水模型,并利用NaOH-CO2溶液体系考察了不同工艺参数对RH-KTB顶吹氧吸收及脱碳和脱气过程的影响.实验结果表明,增大提升气量和顶吹气量,以及降低顶枪高度均有利于顶吹氧吸收过程的进行;增大提升气量有利于脱碳过程的进行;对于顶吹氧的吸收过程,真空室内液面高度存在一个最佳值;当采取顶枪吹氧操作时,应达到最佳真空度以实现顶吹氧的快速吸收;当关闭顶枪吹氧时,应尽可能提高真空度以加速脱碳.

To grasp the mass transfer in RH-KTB vacuum refining process,a water modeling was done on the scale of 1：5.5,and the NaOH-CO2 solution system was used to investigate the effects of different process parameters on the oxygen absorption,decarburization and degassing processes.The experimental results showed that either increasing the lifting gas flowrate and top blowing gas flowrate or decreasing the top lance height benefit the absorption rate of top blowing oxygen,while increasing the lifting gas flowrate benefits decarburization.The liquid surface level in the vacuum chamber has an optimum value for the absorption process of oxygen.When blowing oxygen with a top lance,the vacuum degree should reach its optimum value for fast absorption of oxygen.Moreover,when stopping the top blowing oxygen operation,the vacuum degree should be increased as high as possible to accelerate decarburization.