赵赏鑫, 庞贵良, 邱姝娟, 黄鑫, 滕霖. 甲醇-成品油混合体系相溶性规律实验[J]. 油气储运, 2024, 43(11): 1239-1248. DOI: 10.6047/j.issn.1000-8241.2024.11.005
引用本文: 赵赏鑫, 庞贵良, 邱姝娟, 黄鑫, 滕霖. 甲醇-成品油混合体系相溶性规律实验[J]. 油气储运, 2024, 43(11): 1239-1248. DOI: 10.6047/j.issn.1000-8241.2024.11.005
ZHAO Shangxin, PANG Guiliang, QIU Shujuan, HUANG Xin, TENG Lin. Experimental research on the miscibility law of methanol-product oil blending systems[J]. Oil & Gas Storage and Transportation, 2024, 43(11): 1239-1248. DOI: 10.6047/j.issn.1000-8241.2024.11.005
Citation: ZHAO Shangxin, PANG Guiliang, QIU Shujuan, HUANG Xin, TENG Lin. Experimental research on the miscibility law of methanol-product oil blending systems[J]. Oil & Gas Storage and Transportation, 2024, 43(11): 1239-1248. DOI: 10.6047/j.issn.1000-8241.2024.11.005

甲醇-成品油混合体系相溶性规律实验

Experimental research on the miscibility law of methanol-product oil blending systems

  • 摘要:
    目的 新兴能源甲醇在能源转型中具有重要地位,采用成品油管道顺序输送甲醇可降低输送成本、提高输送效率,但甲醇与汽油、柴油之间特殊的相溶性问题对成品油管道顺序输送甲醇工艺具有较大影响。
    方法  自主设计研发了甲醇-成品油混合相溶性实验装置,对不同醇油比、不同含水率下甲醇-成品油混合体系的相分离温度进行了实验研究。
    结果  ① 在- 10~50 ℃温度范围内,无水甲醇与汽油能够完全相溶。②在含水甲醇-汽油中,水分子与甲醇分子所形成氢键的强度远大于甲醇与汽油之间的结合力。微量水会导致甲醇与汽油的相溶性降低,甲醇含水率每增加0.2%,相分离温度升高7~8 ℃;随着醇油比增大,含水甲醇与汽油的相分离温度先增大、后减小,并在含水甲醇体积分数40%时达到最高。③无水甲醇与柴油存在明显的分层现象,随着温度的升高,柴油在甲醇中的溶解度增大。④含水甲醇与柴油不能完全相溶,随着含水率增大,柴油中的甲醇更易析出。⑤温度的降低会导致甲醇与成品油的相溶性降低,甲醇-成品油混合体系从底部开始析出液滴,且液滴在浮力的作用下不断上浮。
    结论 厘清了不同条件下甲醇-成品油混合体系相溶性的影响规律,揭示了降温过程中甲醇-成品油混合体系分层演变规律,研究成果可为成品油管道顺序输送甲醇工艺的设计与运行提供科学依据及数据支撑。

     

    Abstract:
    Objective  As an emerging energy source, methanol plays a crucial role in the energy transition. Implementing sequential transportation of methanol through existing product oil pipelines can lower transportation costs and enhance efficiency in the transportation process. Nevertheless, the specific miscibility of methanol with gasoline and diesel significantly influences this transmission process.
    Methods  Experimental research was carried out using a setup independently designed and established for blending methanol with product oils, with a focus on determining phase separation temperatures in methanol-product oil blending systems at different methanol-to-oil ratios and varying water contents.
    Results  (1) Anhydrous methanol exhibited complete miscibility with gasoline within the temperature range of - 10 to 50 ℃. (2) In water-containing methanol-gasoline blends, the hydrogen bonds formed by water and methanol molecules were significantly stronger than the binding forces between methanol and gasoline. Even a small amount of water could decrease the miscibility between methanol and gasoline. For every 0.2% increase in water content in methanol, the phase separation temperature increased by 7 to 8 ℃. As the methanol-oil ratio increased, the phase separation temperature of water-containing methanol and gasoline initially rose before decreasing, reaching its peak at a water-containing methanol volume fraction of 40%. (3) A clear stratification was observed between anhydrous methanol and diesel. With rising temperatures, the solubility of diesel in methanol increased. (4) Water-containing methanol was found to be incompletely miscible with diesel. As the water content increased, the separation of methanol from diesel became more pronounced. (5) As temperatures decreased, the miscibility between methanol and product oils reduced, resulting in droplet separation at the bottom of the blending systems. These droplets then ascended gradually due to buoyancy forces.
    Conclusion  The research results clarified the influence of miscibility in methanol-product oil blending systems under various conditions and unveiled the evolution of stratification in these systems as temperatures decrease. These findings offer a scientific foundation and data support for designing and operating the sequential transportation process of methanol in product oil pipelines.

     

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