Abstract:

To improve convergence performance of distillation column simulation, a constant heat transport model was improved and extended to complex columns. A new initialization method was proposed based on the improved model, which could estimate the temperature, flow rates, and composition profiles of a complex column using simple calculations. Two separation processes were used to evaluate the proposed initialization method. The results showed that the proposed method had a similar time consumption with the existing initialization methods, while the obtained initial distribution was closer to the final simulation result than the existing ones. For a nonideal distillation process which was difficult to be converged using other initialization methods, convergence could be obtained using the proposed one.

Key words: distillation column simulation, initialization algorithm, complex column, constant heat transfer model

摘要：

为提高复杂精馏塔模拟的收敛性能，改进了一种恒热传输模型，以将其拓展到复杂精馏塔中，并基于此提出了一种新的通用精馏模拟初始化方法。通过简单计算，所提出方法即可较好地估计复杂精馏塔的温度、流量以及组成沿塔板的分布。通过两个实际精馏分离过程案例，验证了所提出的初始化方法，并与经典初始化方法进行比较。结果表明，所提出初始化方法与经典初始化方法耗时相近，但所获初始分布与最终模拟结果更为接近，从而有效减少了模拟迭代次数，而对于难收敛的非理想体系精馏过程模拟，基于该方法也可以获得收敛。

关键词: 精馏模拟, 初始化算法, 复杂精馏塔, 恒热传输模型