Strategy for Synthesis of Flexible Heat Exchanger Networks Embedded with System Reliability Analysis

• Published in: Chinese journal of chemical engineering Vol. 21; no. 7; pp. 742 - 753
• Main Author: 依大科 韩志忠 王克峰 姚平经
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2013
• Subjects: Decoupling; Economics; flexible heat exchanger network synthesis; Heat exchangers; independent subsystem; Joints; network decoupling; Networks; Optimization; Strategy; System reliability; 合成; 嵌入式; 换热网络; 柔性; 模拟退火算法; 独立子系统; 系统可靠性分析; 网络配置; network decoupling; system reliability; flexible heat exchanger network synthesis; independent subsystem
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/S1004-9541(13)60541-8

System reliability can produce a strong influence on the performance of the heat exchanger network （HEN）. In this paper, an optimization method with system reliability analysis for flexible HEN by genetic/simulated annealing algorithms （GA/SA） is presented. Initial flexible arrangements of HEN is received by pseudo-temperature enthalpy diagram. For determining system reliability of HEN, the connections of heat exchangers（HEXs） and inde- pendent subsystems in the HEN are analyzed by the connection sequence matrix（CSM）, and the system reliability is measured by the independent subsystem including maximum number of HEXs in the HEN. As for the HEN that did not meet system reliability, HEN decoupling is applied and the independent subsystems in the HEN are changed by removing decoupling HEX, and thus the system reliability is elevated. After that, heat duty redistribution based on the relevant elements of the heat load loops and HEX areas are optimized in GA/SA. Then, the favorable network configuration, which matches both the most economical cost and system reliability criterion, is located. Moreover, particular features belonging to suitable decoupling HEX are extracted from calculations. Corresponding numerical example is presented to verify that the proposed strategy is effective to formulate optimal flexible HEN with system reliability measurement.