Laval喷管捕集天然气中CO_(2)的数值研究  

Numerical study on capture of carbon dioxide in natural gas based on Laval nozzle

作　　者：邓晨庆 刘淼儿[1,2] 程昊 李恩道[1,2] 张月 Deng Chenqing;Liu Miaoer;Cheng Hao;Li Endao;Zhang Yue(CNOOC Gas and Power Group,Beijing 100028,China;CNOOC Key Laboratory of Liquefied Natural Gas and Low-Carbon Technology,Beijing 100028,China)

机构地区：[1]中海石油气电集团有限责任公司,北京100028 [2]中国海洋石油集团有限公司液化天然气及低碳技术重点实验室,北京100028

出　　处：《低温与超导》2025年第3期73-80,共8页Cryogenics and Superconductivity

基　　金：国家自然科学基金(U21B2085);工信部高技术船舶科研项目(CBG3N21-2-6)资助。

摘　　要：Laval(拉瓦尔)喷管内的气体高速膨胀过程可诱发低温效应,进而实现多组分气体混合物中高凝点组分的冷凝与分离。为了探究Laval喷管捕集天然气中CO_(2)的可能性,本文以CH4为载气、CO_(2)为可冷凝气体建立了CH4-CO_(2)混合气体超声速凝结流动的数学模型。通过添加输运方程和源项来描述气体和液相之间的关系,以提高对超音速可压缩冷凝流动中复杂传热传质过程预测的准确性。结果表明,等熵流动模型高估了气体的膨胀特性。在非平衡冷凝过程中,基于可凝气体发生的弱冷凝冲击,喷管的冷却性能将会下降。此外,本文阐明了非平衡冷凝过程中凝结参数的分布特征。The high-speed expansion process of gas inside the Laval nozzle can induce a low-temperature effect,thereby enabling the condensation and separation of high-condensation-point components in multi-component gas mixtures.This re⁃search created a mathematical model of CH4-CO_(2)mixed gas supersonic condensation flow utilizing CH4 as the carrier gas and carbon dioxide as the condensable gas in order to investigate the possibilities of Laval nozzle capturing CO_(2)in natural gas.Predic⁃ting complex heat and mass transfer processes in supersonic compressible condensation flow can be made more accurate by inclu⁃ding source terms and transport equations to explain the interaction between gas and liquid phases.The results indicate that the isentropic flow model exaggerates the features of gas expansion.Weak condensation shocks from condensable gases will reduce the nozzle's cooling efficiency in non-equilibrium condensation processes.Furthermore,during non-equilibrium condensation processes,this paper clarified the distribution properties of condensation parameters.

关 键 词：天然气 二氧化碳 喷管 超音速 数值模拟 

分 类 号：TE96[石油与天然气工程—石油机械设备]