The equilibrium model is characterized by the murphree efficiency or height of equivalent to a theoretical plate ( hetp ) value since a tray is generally not working like an equilibrium stage 实际精馏过程往往很难真正达到汽液平衡状态，因此murphree板效率和等板高度概念常用于修正平衡模型计算中的非理想特性。
