化工学报2024，Vol.75Issue(z1)：267-275,9.DOI:10.11949/0438-1157.20240448
混合制冷级联天然气液化工艺优化及分析
Optimization and analysis of natural gas liquefaction process in mixed fluid cascade
摘要
Abstract
The mixed fluid cascade(MFC)process is one of the most competitive processes for large-scale base-loaded natural gas liquefaction process,which consists of three mixed refrigeration cycles of natural gas pre-cooling,liquefaction,and subcooling,which involves key parameters such as refrigerant ratios,refrigeration temperatures,and pressures,which makes the process complex and sensitive.For the MFC liquefaction process,an optimization function with specific power consumption as the objective is established,and with the help of Aspen HYSYS process simulation and physical property calculation,the sequential quadratic programming(SQP)optimization algorithm is used to globally optimize the MFC process and conduct energy efficient analysis of the process.The optimization results show that after the global optimization,the specific power consumption of the MFC liquefaction process is 899.36 kJ/kg,which is 7.38％lower.The cold-heat composite curve of the multi-strand flow heat exchanger is better matched.Through the effective energy analysis,it is found that the effective energy loss of the refrigeration compressor unit accounts for the largest proportion,and the effective energy loss of the multi-strand flow heat exchanger is significantly reduced after the optimization,and the effective energy efficiency of the liquefaction process is increased from 38.17％to 41.21％,and the energy utilization efficiency is improved obviously.关键词
天然气液化/比功耗/优化/有效能分析Key words
natural gas liquefaction/unit power consumption/optimization/effective energy analysis分类
能源科技引用本文复制引用
蒲黎明,汪贵,郑春来,王科,向腾龙,王治红..混合制冷级联天然气液化工艺优化及分析[J].化工学报,2024,75(z1):267-275,9.基金项目
中国石油天然气集团有限公司科学研究与技术开发项目(2019B-3203) （2019B-3203）
