天然气减阻剂分离模拟试验

Separation simulation experiment of gas drag reduction agent

BIB天然气减阻剂经雾化注入输气管道以后,一部分涂敷在管壁上,其余部分随气流进入管道末站的分离器。通过模拟试验,测试了旋风分离器和过滤分离器对管输气体中剩余天然气减阻剂的分离效率。研究表明:双切向进口旋风分离器对雾化天然气减阻剂的分离效率较高,且当入口雾滴的粒径分布固定时,气液分离效率随入口气速和雾滴质量浓度的增大而提高;过滤分离器对天然气减阻剂的过滤效率超过99.9%,且过滤效率随入口雾滴的质量浓度和雾滴粒径的增大而提高,当雾滴粒径达到一定程度时将被完全过滤掉。经过两级分离器分离,管输气体中的减阻剂含量极低,基本不会对下游用户和输气设备产生不良影响。分离器是天然气减阻剂的使用结点,天然气减阻剂一旦经过分离器,必须再行加注。

A kind of gas drag reduction agent(GDRA),named BIB,was injected into pipeline after atomization.Part of the GDRA was bonded with the inner wall of pipe,and the rest went ahead with the gas flow to the separator in the terminal station.The work efficiency of cyclone and filter separator for the residual GDRA in gas were tested by simulation experiment.The results showed that the cyclone separator with double tangential inlet displayed a higher efficiency upon the atomized GDRA separation.When the distribution of inlet droplets'diameter was constant,separation efficiency for the gas-liquid was increased with the higher inlet gas velocity and larger droplets'mass concentration.The work efficiency of filter separator was more than 99.9%,and it was increased with the larger diameter and mass concentration of droplets.The GDRA would totally be filtered if the diameter of droplet at the inlet was large enough.After two-stage separation,there was little GDRA residue in the gas,which would barely influence the gas supply to the downstream users and facilities of gas transmission.Separator is a junction for GDRA injection,and once the GDRA flows through it,it is necessary to reinject the GDRA to the gas.