本文基于相似的动力学机理，利用溶解氧在水溶液中释放过程模拟了钢液真空脱气过程. 在负压25 kPa条件下发现，容器壁面或测氧探头表面会析出大量细小气泡，这一现象与以往脱气数学模型假设的内部脱气反应非常类似；为了验证内部脱气位点的存在，通过引入机械搅拌，对熔池表面和内部脱气速率进行了分析计算. 实验结果表明，在整个脱气过程中熔池表面脱气速率很低，而内部脱气位点析出的气泡会极大的提高溶解氧的去除速率，尤其当真空压力P=25 kPa时，其脱气速率约为熔池表面的脱气速率10倍，但内部反应仅局限于脱气的初始阶段，即高溶解氧浓度范围内. 另外，水溶液中溶解氧的去除也为一级反应过程，其体积传质系数kA/V为常数, 因此可以利用溶解氧在水溶液中去除过程模拟钢液的真空脱气行为. 为了描述真空压力和吹氩流量对kA/V的影响，引入搅拌动能密度ε概念，通过回归得到了log(kA/V)与logε之间函数关系，并与以往的模拟研究进行了对比.
Based on the similar kinetic mechanism, the vacuum degassing process of molten steel is simulated by using the release process of dissolved oxygen (DO) in water. Under the condition of vacuum pressure experiment, it was found that a large number of small bubbles would be precipitated from the vessel internal wall or the surface of oxygen probe, which was very similar to the internal degassing reaction site assumed by previous degassing mathematical models. To verify the existence of internal degassing sites, the mechanical stirring was introduced to analyze and calculate the degassing rate at the bath surface and internal site.The results showed that the degassing rate of bath surface was very low in the whole process, and the bubbles precipitated from the internal degassing sites would greatly improve the DO removal rate, especially when the pressure P=25 kPa, its degassing rate was about 10 times of that at the bath surface; It was also confirmed that the internal degassing reaction mainly occurred in the initial stage of degassing, that is, in the range of high DO concentration. Besides, the removal of dissolved oxygen is also a first-order reaction process, and its volumetric mass transfer coefficient kA/V is constant. Therefore, the DO removal process can be used to simulate the degassing behavior of molten steel. In order to describe the effect of vacuum pressure and argon flow rate on kA/V, the function relationship between log(kA/V) and logε was obtained by introducing the concept of stirring power density ε, which was compared with previous simulation studies.