Based on the mechanism of HRSG, the working medium under the water-level of the drum was lumped as a lumped system with dynamic dryness.Subsequently, the complex of drum model was alleviated.

• 从对象工作机理出发，将汽包水面下工质集总成具有一定干度的汽水混合物，从而简化了汽包建模仿真的复杂度。