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

作　　者：赵赏鑫 庞贵良 邱姝娟 黄鑫[2] 滕霖 ZHAO Shangxin;PANG Guiliang;QIU Shujuan;HUANG Xin;TENG Lin(PipeChina West-East Gas Pipeline Company//Xinjiang Key Laboratory for Transportation Safety of Multi-Medium Pipelines;School of Chemical Engineering, Fuzhou University)

机构地区：[1]国家管网集团西部管道分公司·新疆多介质管道安全输送重点实验室 [2]福州大学化工学院

出　　处：《油气储运》2024年第11期1239-1248,共10页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金青年科学基金项目“电场作用下双液滴不聚并与多液滴成链机理研究”,52204073;国家自然科学基金青年科学基金项目“干冰颗粒碰撞聚并行为的微尺度界面演化机制研究”,52204072。

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。(图15,表1,参27)[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-produ

关 键 词：甲醇 成品油 汽油 柴油 相溶性 含水率 相分离温度 

分 类 号：TE832[石油与天然气工程—油气储运工程]