在对化工过程系统进行设计或研究的过程中,特别是在对化工过程系统进行优化的过程中,往往要多次进行有关系统的物料衡算。实际上,物料衡算在化工过程系统的数学模拟中占有极其重要的地位。迄今为止,对化工过程系统的物料衡算问题的求解方法进行了大量的工作,提出了不少方法。这些方法大致有三类:直接法,线性模型法和模块化法。第一类方法是对系统的所有方程同时求解,所有变量进行迭代,计算时间长而内存需要大。第三类方法将单元过程的有关方程安排在相应的模块中,采用单元迭代,逐个模块进行计算,易于通用化和序列化。这 In the process of designing or studying a chemical process system, especially in the process of optimizing a chemical process system, the material balance of the relevant system is often repeated several times. In fact, material balance plays a very important role in the mathematical simulation of chemical process system. So far, a great deal of work has been done on the solution to the material balance problem of the chemical process system, and many methods have been put forward. These methods are roughly three categories: direct method, linear model method and modular method. The first method is to solve all equations of the system at the same time. All the variables are iterated, the calculation takes a long time and the memory needs to be large. The third kind of method arranges the relevant equations of unit process in the corresponding module, adopts the unit iteration, carries on the computation by the module one by one, it is easy to generalize and serialize. This