一种预留节点策略应用于换热网络优化

doi:10.11949/0438-1157.20241468

摘要/Abstract

摘要：

使用RWCE算法优化换热网络时，算法的随机性可能导致连续节点上存在换热单元，从而影响后续新单元的生成。为了解决这一问题，提出一种预留节点策略改良该算法。为了促进分流节点上换热单元的竞争，将节点非结构模型改良成分流连续节点非结构模型。分流上存在多个节点，也会有效避免出现连续节点上存在换热单元的状况发生，有效促进节点之间的相互竞争。最终使用H4C5和H10C5两个算例验证该策略的有效性，得到的年综合费用分别是2890453 USD/a和5091842 USD/a，由此证明了将该策略改良RWCE算法在换热网络优化上的有效性。

关键词: 算法, 系统工程, 优化设计, 换热网络, 结构进化

Abstract:

When optimizing heat exchanger networks using the RWCE algorithm, the randomness of the algorithm may result in heat exchangers being placed consecutively on adjacent nodes, which can affect the generation of new units. In order to solve this problem, this study proposes a reserved node strategy to improve the algorithm. To promote the competition of heat exchange units on the split nodes, the node unstructured model is improved to the split continuous node unstructured model. The existence of multiple nodes on diverging nodes can also effectively prevent the situation where heat exchangers are placed consecutively on adjacent nodes, thereby promoting mutual competition among nodes. Finally, the effectiveness of the strategy was verified using two examples, H4C5 and H10C5, and the annual comprehensive costs were 2890453 USD/a and 5091842 USD/a, respectively, which proved the effectiveness of the improved RWCE algorithm in heat exchange network optimization.

Key words: algorithm, system engineering, optimal design, heat exchanger network, structural evolution

中图分类号:

TQ 028.8

吴小龙, 黄晓璜, 肖媛, 单灵海, 叶家慧, 崔国民. 一种预留节点策略应用于换热网络优化[J]. 化工学报, 2025, 76(7): 3388-3402.

Xiaolong WU, Xiaohuang HUANG, Yuan XIAO, Linghai SHAN, Jiahui YE, Guomin CUI. Reserve empty node strategy applied to optimization of heat exchanger networks[J]. CIESC Journal, 2025, 76(7): 3388-3402.

图/表 19

图1 H3C2有分流结构示意图

Fig.1 Structural diagram of H3C2 split heat exchanger network

图2 连续换热单元示意图

Fig.2 Schematic diagram of continuous heat exchange unit

图3 流股上节点被占据

Fig.3 Node on flow stock is occupied

图4 节点位置对换热单元的影响

Fig.4 Effect of node location on heat exchanger units

图5 单元换热量变化曲线

Fig.5 Variation curve of unit heat transfer quantity

图6 连续节点非结构模型

Fig.6 Continuous node unstructured model

图7 分流上3个节点的连续节点非结构模型

Fig.7 Continuous node unstructured model with three nodes on shunt

图8 同一分流上换热单元竞争图示

Fig.8 Competition diagram of heat exchange units on the same branch flow

图9 换热单元重新布置前结构

Fig.9 Structure before rearrangement of heat exchange unit

图10 热流股重新布置后的结构

Fig.10 Structure of rearrangement of heat flow strands

图11 热单元重新布置后的结构

Fig.11 Structure of rearrangement of thermal unit

图12 不同算法优化曲线

Fig.12 Optimization curves of different methods

图13 策略生效前结构

Fig.13 Structure when policy is not in effect

图14 策略生效后无新单元生成结构

Fig.14 Structure without new units generated after strategy takes effect

图15 新单元生成后结构

Fig.15 Structure after new unit is generated

图16 算例1最终优化结果

Fig.16 Optimization results of case 1

表1 算例1优化结果对比

Table 1 Comparison of optimization results in case 1

来源	换热单元数	Q_HU/MW	Q_CU/MW	TAC/(USD/a)
文献^[22]	14	23.90	31.62	2920933
文献^[23]	15	24.40	32.15	2883847
文献^[24]	12	23.85	31.57	2919675
文献^[25]	15	24.14	31.86	2918341
文献^[26]	15	24.94	30.12	2917682
本研究	12	23.76	31.48	2890453

图17 算例2最终优化结果

Fig.17 Optimization results of case 2

表2 算例2优化结果对比

Table 2 Comparison of optimization results in case 2

来源	换热单元个数	Q_HU/MW	Q_CU/MW	TAC/(USD/a)
文献^[27]	24	41.35	59.20	6019310
文献^[28]	29	43.28	61.15	5613283
文献^[29]	22	27.38	45.25	5233287
文献^[30]	26	27.16	44.97	5177785
本文	24	26.50	44.37	5091842

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