基于改进恒热传输模型的精馏模拟初始化

doi:10.16085/j.issn.1000-6613.2022-1853

摘要/Abstract

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

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

中图分类号:

TQ028.31

张帆, 陶少辉, 陈玉石, 项曙光. 基于改进恒热传输模型的精馏模拟初始化[J]. 化工进展, 2023, 42(9): 4550-4558.

ZHANG Fan, TAO Shaohui, CHEN Yushi, XIANG Shuguang. Initializing distillation column simulation based on the improved constant heat transport model[J]. Chemical Industry and Engineering Progress, 2023, 42(9): 4550-4558.

图/表 14

参考文献 25

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冷凝器类型	全凝器	部分冷凝汽液分别采出	部分冷凝汽相采出	无冷凝
塔顶	x_i,₁=z_i_,d	y_i_,1=z_i_,d	y_i_,1=z_i_,d	y_i_,1=z_i_,d
汽相采出	y_i,j =z_i,j
液相采出	x_i,j =z_i,j
塔底	x_i,_b=z_i,_b

冷凝器类型	全凝器	部分冷凝汽液分别采出	部分冷凝汽相采出	无冷凝
塔顶	x_i,₁=z_i_,d	y_i_,1=z_i_,d	y_i_,1=z_i_,d	y_i_,1=z_i_,d
汽相采出	y_i,j =z_i,j
液相采出	x_i,j =z_i,j
塔底	x_i,_b=z_i,_b

项目	数值	项目	数值
进料温度/K	328.15	F1-1进料流量/mol·s^-1	326.491
进料压力/kPa	2301.32	进料组分流量/mol·s^-1
塔板数	56	丙烷	36.436
冷凝器类型	全凝器	丙烯	111.464
进料位置	26	异丁烷	89.654
物性方法	PR	正丁烷	20.406
塔顶采出量/mol·s^-1	147.836	1-丁烯	18.659
回流比	2.73	异丁烯	18.659
冷凝器压力/kPa	1901.33	反-2-丁烯	17.761
塔内压降/kPa	60	顺-2-丁烯	13.451

项目	数值	项目	数值
进料温度/K	328.15	F1-1进料流量/mol·s^-1	326.491
进料压力/kPa	2301.32	进料组分流量/mol·s^-1
塔板数	56	丙烷	36.436
冷凝器类型	全凝器	丙烯	111.464
进料位置	26	异丁烷	89.654
物性方法	PR	正丁烷	20.406
塔顶采出量/mol·s^-1	147.836	1-丁烯	18.659
回流比	2.73	异丁烯	18.659
冷凝器压力/kPa	1901.33	反-2-丁烯	17.761
塔内压降/kPa	60	顺-2-丁烯	13.451

方法	初始化耗时 /s	迭代收敛次数
方法	初始化耗时 /s	Boston标准法	Boston非理想法	牛顿法
Boston法	0.328	9	8	4
Venkataraman法	0.395	10	7	12
原CHT法	0.421	8	7	7
改进CHT法	0.438	7	7	4