液氨管道水力热力特性影响因素数值模拟  

Numerical simulation of influencing factors on hydraulic and thermal characteristics of liquid ammonia pipelines

作　　者：滕霖 林嘉豪 尹鹏博 李卫东 黄鑫 李加庆 罗宇 江莉龙 TENG Lin;LIN Jiahao;YIN Pengbo;LI Weidong;HUANG Xin;LI Jiaqing;LUO Yu;JIANG Lilong(College of Chemical Engineering,Fuzhou University/National Engineering Research Center of Chemical Fertilizer Catalyst/Qingyuan Innovation Laboratory)

机构地区：[1]福州大学石油化工学院·化肥催化剂国家工程研究中心·清源创新实验室

出　　处：《油气储运》2023年第3期283-290,共8页Oil & Gas Storage and Transportation

基　　金：国家重点研发计划“氢能技术”专项“高效热化学合成氨催化剂的创制及其批量制备技术”,2021YFB4000403;国家自然科学基金创新研究群体“氨能源催化工程”,22221005;国家自然科学基金重点项目“基于缔合加氢机理的高性能亚纳米Ru基合成氨催化剂设计制备及应用基础研究”,22038002;福建省科技厅重大专项专题“可再生能源与‘氨氢能源’互补的新型分布式能源系统关键技术及集成验证”,2020HZ07009。

摘　　要：液氨物性参数受自身体积膨胀性和温度敏感性影响较大,管道输送过程中液氨易汽化并产生气阻现象。为探究液氨管道水力热力特性发展规律,参考中国现有液氨管道设计运行参数,在修正液氨物性参数的基础上建立液氨长输管道仿真模型,模拟分析管径、环境温度、出口压力、入口温度、输量及土壤介质对液氨管道水力热力特性的影响。结果表明:随着管径增大,管道全线压力下降趋势逐渐平缓,当环境温度低于投氨温度时,适当增大管径能够有效避免液氨相特性的大幅改变;在综合考虑管道承压和液氨膨胀性的基础上,适当提高管道压力能够有效降低液氨汽化风险;在低输量工况下,提高输量对液氨管道全线压降影响较小、对温降影响较大,在高输量工况下结论则正好相反。研究成果可为液氨长输管道的设计和安全稳定运行提供参考。As the physical parameters of liquid ammonia are greatly influenced by its volume expansibility and temperature sensitivity,the gas blocking phenomenon easily occurs in liquid ammonia pipelines due to the gasification of liquid ammonia.In order to explore the hydraulic and thermal characteristics of liquid ammonia pipelines,the simulation model of long-distance liquid ammonia pipelines was established with the correction of physical parameters of ammonia based on the actual design and operation parameters of existing liquid ammonia pipeline in China.The influences of pipe diameter,ambient temperature,outlet pressure,inlet temperature,flow rate and soil medium on the hydraulic and thermal characteristics of liquid ammonia pipelines were simulated and analyzed.The results show that,with the increase of pipe diameter,the downward trend of pressure in the whole pipeline gradually becomes flat.When the ambient temperature is lower than the inlet temperature of the pipeline,the phase change of liquid ammonia can be effectively avoided by the appropriate increase of pipe diameter.On the basis of comprehensive consideration of pipeline pressure and liquid ammonia expansibility,appropriately increasing pipeline pressure can effectively reduce the risk of liquid ammonia gasification.At low flow rate,the increase of flow rate has little influence on the pressure drop and great influence on the temperature drop in liquid ammonia pipelines,while the conclusion is opposite at high flow rate.The research results are expected to provid a reference for the design and safe operation of ammonia pipeline.

关 键 词：液氨管道 水力特性 热力特性 影响因素 数值模拟 

分 类 号：TE832[石油与天然气工程—油气储运工程]