“极限真空”，表示该状态下，没有任何物质（包括分子、原子等）存在，这只是理论上才存在的状态，实际是不可能达到的。
介绍了设计原则、实现途径和极限真空估算。
The design principle, the way to carry out and estimation of limited vacuum were introduced.
环境温度较高时，油温升高，粘度下降，饱和蒸汽增大，会引起极限真空上升，应加强通风散热。
Higher temperature, oil temperature increase, decrease viscosity, steam increased, the limit will cause a vacuum up, we should strengthen the ventilation cooling.
真空抽气系统抽气性能的好坏直接影响RH-KTB精炼的脱气、脱碳、脱氮的效果，极限真空度高低决定了钢水最终的气体含量。
Vacuum extraction system of extraction performance affects behavior of degassing , decarburization, denitriding and so on in RH_KTB refining process.
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