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[1]李子禾,朱建鲁,苗青,等.PLNG中CO2液固相平衡实验测定与理论计算[J].油气储运,2024,43(08):1-13.
　LI Zihe,ZHU Jianlu,MIAO Qing,et al.Experimental measurement and theoretical calculation of liquid-solid phase equilibrium of carbon dioxide in PLNG[J].Oil & Gas Storage and Transportation,2024,43(08):1-13.
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PLNG中CO2液固相平衡实验测定与理论计算

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年08期 页码: 1-13 栏目: 出版日期: 2024-08-25
Title:
Experimental measurement and theoretical calculation of liquid-solid phase equilibrium of carbon dioxide in PLNG
作者:
李子禾；朱建鲁；苗青；闫峰；欧阳欣；聂超飞；韩辉；李玉星
Author(s):
LI Zihe;  ZHU Jianlu;  MIAO Qing;  YAN Feng;  NIE Chaofei;  HU Qihui;  LI Yuxing
关键词:
带压液化天然气; 二氧化碳; 液固相平衡; 状态方程; 遗传算法
Keywords:
Pressurized liquefied natural gas;  carbon dioxide;  liquid-solid phase equilibrium;  equations of state;  genetic algorithm
分类号:
TE642
文献标志码:
A
摘要:
【目的】浮式液化天然气（Floating Liquefied Natural Gas，FLNG）装置相比传统海底管道更适用于海上天然气的开发，但其目前造价高昂，对于部分气田来说经济性并不可观，因此其推广应用价值受到一定的限制。为解决FLNG造价高昂等问题，提出带压液化天然气（Pressurized Liquefied Natural Gas，PLNG）技术。带压条件下天然气液化温度上升，二氧化碳等杂质溶解度也随之增大，对于CO2含量不高的气源，天然气预处理装置可实现简化甚至取消。为得到PLNG的气质处理指标，需对CO2在PLNG中的液固相平衡机理展开研究。【方法】设计并搭建新型液固相平衡实验装置，其具有可视化与连续取样功能，借助该装置开展二氧化碳液固相平衡实验测定；构建了基于液固相平衡原理的CO2固体溶解度理论计算模型，利用实验数据通过遗传算法对二元交互作用系数进行优化。【结果】实验结果表明：在162 K左右（对应纯甲烷饱和蒸汽压约1.7 MPa），二氧化碳固体在液化天然气中的溶解度超过1.5%。计算结果表明：经过遗传算法的优化，理论计算模型对于CO2固体溶解度的计算精度得到提高，以CO2在纯甲烷中的溶解度为例，优化后模型的计算结果与实验数据的平均百分比相对误差由10.83%降至2.333 6%。【结论】研究结果为带压液化条件下二氧化碳预处理气质指标的制定提供了计算精度较高的理论计算模型作为依据，同时也为后续液固相平衡研究提供了实验装置，未来可通过该装置开展对PLNG温区下重烃组分在LNG中的液固相平衡研究，建立较完善的杂质析出模型。
Abstract:
【Objective】FLNG (Floating Liquefied Natural Gas) units are considered to be more suitable for offshore natural gas development than traditional subsea pipelines, but they are currently expensive and not economically viable for some gas fields, so their popularization and application have been limited to some extent. In order to solve the problem of high cost of FLNG, PLNG ( Pressurized Liquefied Natural Gas ) technology is proposed. With the increase of liquefaction temperature under pressure, the solubility of impurities such as carbon dioxide also increases, so the pretreatment device may be simplified or even eliminated. In order to obtain the gas treatment index of PLNG, it is necessary to study the liquid-solid phase equilibrium mechanism of carbon dioxide in PLNG. 【Methods】A new liquid-solid phase equilibrium experimental device was designed and built, which realized the combination of visualization and continuous sampling function, and the liquid-solid phase equilibrium of carbon dioxide was measured. A theoretical calculation model of CO2 solid solubility based on the principle of liquid-solid phase equilibrium was constructed, and the binary interaction coefficients were optimized by genetic algorithm using experimental data. 【Results】The experimental results show that the solubility of carbon dioxide in liquefied natural gas is more than 1.5 % at about 162K ( corresponding to the saturated vapor pressure of pure methane is about 1.7MPa ). The results show that after the optimization of the genetic algorithm, the accuracy of the theoretical model for the calculation of the solubility of CO2 solids has been improved, and the relative error between the optimized model and the average percentage of the experimental data has been reduced from 10.83% to 2.333% for the solubility of CO2 in pure methane. 【Conclusion】The research results provide a theoretical calculation model with high computational accuracy as a basis for the formulation of gas indexes of carbon dioxide pretreatment under pressurized liquefaction conditions, and also provide an experimental device for the subsequent liquid-solid phase equilibrium study, which can be used in the future to establish a better impurity precipitation model by carrying out a liquid-solid phase equilibrium study of heavy hydrocarbon fractions in LNG under the temperature zone of PLNG.

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更新日期/Last Update: 2024-06-14