乙二醇溶液作用下丙烷水合物分解实验研究

EXPERIMENTAL STUDY ON PROPANE HYDRATES DISSOCIATION IN PRESENCE OF ETHYLENE GLYCOL SOLUTION

通过可视化天然气水合物开采模拟系统进行了模拟抑制剂法分解天然气水合物实验,研究了恒流量注入不同质量分数(60.1%,69.8%,80.2%,99.5%)乙二醇(Ethylene glycol)溶液定容分解丙烷水合物实验,研究了抑制剂分解丙烷水合物过程中的温度、压力变化等,同时进行了热量衡算及能效分析。计算得平均分解速率介于3.59～7.67mol·min-1·m-3,平均分解反应速率随浓度变化近似呈线性增长;能效介于61.8%～81.5%;能量产出比介于4.89～6.49;随乙二醇浓度的增加,能量效率和能量产出比也随之增大,但增加的梯度中会出现拐点。与注纯水相比注乙二醇可减少水合物分解时所需要的热量,加速水合物分解,提高分解的能量效率和能量产出比;与低浓度抑制剂相比能效和能量产出比也有明显的提高。

The simulation experiment is carried out with different concentration of ethylene glycol solution(60.1%,69.8%,80.2%,99.5%) by a self-made visual equipment.At the beginning of the dissociation,the pressure increases rapidly and liquid temperature decreases quickly.As the dissociation processes,pressure tends gradually to be a definite value and the grades of liquid temperature are gentle.The computation shows that average dissociation rate is 3.59～7.67(mol·min-1·m-3).The change of average dissociation velocity rate with different concentration assumes the linear growth approximately.The calculated energy efficiency is 61.8%～81.5%.The calculated energy ratio is 4.89,5.73,5.97 and 6.49 respectively.Energy efficiency increases along with increase of concentration of ethylene glycol solution,but there is an inflection point during the process.Compared with injection of pure water,the injection of ethylene glycol reduces the dissociation heat of natural gas hydrate,accelerates the dissociation of natural gas hydrate and increases energy efficiency and energy ratio.Compared with injection of low concentration of ethylene glycol solution,energy efficiency and energy ratio increase,too.