气田三甘醇尾气处理及液烃回收新工艺应用

Application of New Technology for Gas Field Triethylene Glycol Tail Gas Treatment and Liquid Hydrocarbon Recovery

随着气田的深入开采,三甘醇尾气处理技术的潜在问题逐步浮现。常规的尾气处理方法在放空前,尾气未完全冷凝或冷凝液未充分分离,导致放空头滴液,严重影响环境安全。对尾气进行燃烧净化改造,虽然可以解决滴液问题,但是,由于三甘醇重沸器尾气温度高,尾气轻烃无法被完全回收,导致轻烃资源的浪费和火炬燃烧黑烟问题出现。针对以上问题,进行创新工艺,从改造成本、施工作业难度和回收物硫化氢对工艺系统的腐蚀影响等方面综合考虑,在不影响三甘醇尾气回收装置(冷却器)加装效果的前提下,将冷却器加装至放空分液罐下游至闭排罐流程中间。加装冷却器后,达到了降温冷凝回收液烃和减少火炬黑烟的目的,应用效果显著。

With the deepening of gas field exploitation,potential problems of triethylene glycol tail gas treatment technology are gradually emerging.Conventional exhaust gas treatment methods result in incomplete condensation of exhaust gas or insufficient separation of condensate before venting,leading to empty droplets and seriously affecting environmental safety.Although the combustion purification transformation of exhaust gas can solve the droplet problem,due to the high exhaust temperature of the triethylene glycol reboiler,the light hydrocarbons in the exhaust gas cannot be completely recovered,resulting in the waste of light hydrocarbon resources and the problem of black smoke from torch combustion.In response to the above issues,innovative processes have been developed,taking into account factors such as renovation costs,difficulty of construction operations,and the corrosive effects of recycled hydrogen sulfide on the process system.On the premise of not affecting the installation effect of the triethylene glycol tail gas recovery device(cooler),the cooler will be installed in the middle of the process from the downstream of the vent separation tank to the closed discharge tank.After installing a cooler,the goal of cooling,condensing,and recovering liquid hydrocarbons and reducing torch black smoke has been achieved,and the application effect is significant.