百万吨级天然气液化工艺的设计模型验证与参数优化  

Design model validation and parameter optimization of megaton natural gas liquefaction process

作　　者：蒲黎明 李莹珂 熊英杰 汤林 王凯[1] 邱利民[1] PU Liming;LI Yingke;XIONG Yingjie;TANG Lin;WANG Kai;QIU Limin(Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou,Zhejiang 310027,China;Southwest Company,China Petroleum Engineering&Construction Corporation,Chengdu,Sichuan 610041,China;National Energy R&D Center for LNG Technology,Beijing 100032,China;CNPC Kunlun Capital Co.,Ltd.,Beijing 100007,China)

机构地区：[1]浙江大学制冷与低温研究所 [2]中国石油工程建设有限公司西南分公司 [3]国家能源液化天然气技术研发中心 [4]中国石油集团昆仑资本有限公司

出　　处：《天然气工业》2025年第3期162-169,共8页Natural Gas Industry

基　　金：中国石油天然气集团有限公司关键核心技术攻关项目(编号:2021ZG13)。

摘　　要：昆仑能源湖北黄冈液化天然气工厂是中国唯一的百万吨级天然气液化工厂,经过10年的平稳运行,证明我国自主开发的百万吨级天然气液化工艺技术和国产化装备可靠性较高。中国已实现百万吨级液化天然气工厂的自主建设和运营,但在工艺优化和降低能耗方面仍存在较大提升空间。为此,以昆仑能源湖北黄冈液化天然气工厂为例,重点对该工厂的工艺流程进行了介绍和模拟验证,并在此基础上对工艺参数进行了优化。研究结果表明:(1)采用工厂实际运行数据对多级单组分制冷天然气液化工艺(Multistage Single Component refrigeration natural gas liquefaction process,MSC)的计算模型进行了验证,并采用热力学分析方法对MSC工艺的换热系统进行了优化;(2)模拟计算结果和实际运行数据吻合度高,单位能耗数据相差2.40%,证实计算模型可信度高;(3)基于热力学分析,优化了对数平均温差,换热过程的总?损降低了15.67%,单位能耗为每千克LNG 0.318 k W·h,比验证计算模型下降2.15%。结论认为,研究成果可指导该工厂下一步的节能降耗,同时为开发单线规模800×10^(4) t/a的超大型天然气液化成套技术提供理论支撑,实践经验对指导中国超大型天然气液化工厂高质量发展具有重要的工程应用价值。The Hubei Huanggang LNG Plant of Kunlun Energy is China’s only megaton LNG plant,and its 10 years of smooth operation has proved high reliability of China’s independently developed megaton natural gas liquefaction process and technology and localized equipment.China has achieved independent construction and operation of megaton LNG plant,but significant improvement is still necessary in process optimization and energy consumption reduction.Taking the Hubei Huanggang LNG Plant of Kunlun Energy as an example,this paper mainly introduces its technological process and verifies the effectiveness through simulation.Then,the technological parameters are optimized.The following results are obtained.First,the calculation model of multistage single component refrigeration natural gas liquefaction process(MSC)is validated using the actual operating data of the plant,and the heat exchange system of MSC process is optimized by means of the thermodynamic analysis.Second,the simulation calculation results are highly consistent with the actual operation data,with a unit energy consumption difference of 2.40%,which proves a high reliability of the calculation model.Third,based on the thermodynamic analysis,the logarithm mean temperature difference is optimized,with a total exergy loss in the process of heat exchange reduced by 15.67%,while the specific energy consumption decreased by 2.15%compared with the validated computational model,reaching 0.318 kW·h per kilogram of LNG.In conclusion,the research results can provide the plant with guidance for energy conservation and consumption reduction in the next step,as well as theoretical support for developing a complete set of technologies 4 for ultra-large natural gas liquefaction with a single line scale of 800×10^(4) t/a,which are of important engineering application value and practical experiences in guiding the high-quality development of ultra-large natural gas liquefaction plants in China.

关 键 词：天然气液化 LNG MSC 模型验证 热力学分析 [火用]损 参数优化 

分 类 号：TE64[石油与天然气工程—油气加工工程]