水合物热力学抑制剂性能评价及变化规律数值模拟研究

Numerical simulation study on performance evaluation and change law of hydrate thermodynamic inhibitor

针对水合物抑制剂用量大、应用效率低的问题,采用数值模拟方法研究了甲醇、乙二醇、二甘醇、三甘醇、乙醇5种热力学抑制剂在不同含量下对水合物生成抑制效果的变化规律,并对不同种类不同含量下抑制剂的性能进行了评价。结果表明:5种热力学抑制剂均对水合物有抑制作用,且随着总含量的累积,乙二醇单位含量抑制效果逐渐增强,二甘醇和乙醇单位含量抑制效果逐渐减弱,三甘醇单位含量抑制效果先变小后变大,甲醇单位含量抑制效果基本不变;摩尔分数小于10%或大于20%时,三甘醇抑制性能最好,中等含量下乙二醇抑制效果较好,整个范围内,乙醇和二甘醇抑制效果较差;研究结果可为水合物抑制剂的选用提供参考,以便节约成本,达到高效利用抑制剂的目的。

In order to solve the problems of high consumption and low efficiency of hydrate inhibitors,the inhibition effects of five thermodynamic inhibitors including methanol,ethylene glycol,diethylene glycol,triethylene glycol and ethanol with different contents on hydrate formation were studied by numerical simulation,and their inhibition performances were also evaluated.The results show that all the five thermodynamic inhibitors have inhibition effect on hydrate formation,and with the accumulation of total content,the inhibition effect of unit content of ethylene glycol gradually increased,unit content of diethylene glycol and ethanol gradually weakened,the unit content of triethylene glycol decreased first and then increased,unit content of methanol basically unchanged respectively.When the molar fraction is less than 10%or more than 20%,the inhibition performance of triethylene glycol is the best.Moreover,ethylene glycol is better at medium content,but ethanol and diethylene glycol are poor in the whole range.The results can provide a reference for the selection of hydrate inhibitors to save cost and achieve the purpose of efficient utilization.