组合型抑制剂对天然气水合物生成过程的影响

在高压搅拌式定容反应釜中研究了低剂量组合型抑制剂GHCI2(聚乙烯吡咯烷酮(PVP)、聚醚胺、乙二醇丁醚按质量比1∶1∶1组合而成)对天然气水合物生成过程的影响,并与动力学抑制剂PVP进行了比较;同时考察了GHCI2含量和过冷度对其抑制效果的影响,并对GHCI2的抑制机理进行了分析。实验结果表明,添加质量分数0.50%的GHCI2和PVP后,水合物生成的抑制时间分别为8 800min和1 100min,GHCI2的抑制效果明显优于PVP。在GHCI2质量分数为0.20%～2.00%时,抑制效果随GHCI2含量的增加呈先增强后减弱的趋势,GHCI2质量分数为0.75%时,抑制效果最好;过冷度越大,水合物生成的抑制时间越短。

Effects of Combinative Inhibitor on Natural Gas Hydrate Formation Process

In order to prevent the natural gas hydrate from plugging the pipeline,low-dosage inhibitors were used to mitigate the formation of the hydrate.A low-dosage combinative inhibitor GHCI2,which was composed of polyvinylpyrrolidone(PVP),polyetheramine and ethylene glycol monobutyl ether with mass ratio 1∶1∶1,was prepared in a high-pressure stirred tank reactor,and compared with the kinetic inhibitor PVP.Effects of the GHCI2 concentration and subcooling on the hydrate formation were investigated.The results showed that the inhibition times were 8 800 min and 1 100 min in the presence of 0.50%(w) GHCI2 and 0.50%(w) PVP,respectively.When mass fraction of GHCI2 increased from 0.20% to 2.00%,the inhibition time increased firstly and then decreased,and reached maximum at the mass fraction of 0.75%.The inhibition time became shorter with enhancing of subcooling.The inhibition mechanism of GHCI2 was analyzed based on the experimental results.