稳态模型建立的基础是MESH方程，即物料平衡方程、相平衡方程、组分加和方程和焓平衡方程。
The basis of stable model is MESH equation, or mass, vapor-liquid, component addition, and enthalpy equilibrium equations.
即内层迭代是将物料平衡方程和相平衡方程联立，化为三对角矩阵形式，由之解出各板液相组成后，通过泡点计算法求定各板新的温度和相平衡常数。
The internal iterative calculation is to correlate the equations of mass and phase equilibrium into a triple diagonal matrix from which the liquid compositions can be found out.
这就意味着，在某一个阶段的前后物料平衡函数实际上是一个微分方程，而每一个方程都以一个停滞为变量。
This means that the material balances around the stages are actually differential equations and each equation includes holdup as a variable.
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