高含硫天然气集气站三甘醇脱水工艺对比

Comparison of triethylene glycol dehydration process in high sulfur content natural gas gathering station

关键词:  三甘醇  脱水  腐蚀  H₂S  富液气提  HYSYS模拟

Key words:  TEG  dehydration  corrosion  hydrogen sulfide  rich liquid gas stripping  HYSYS simulation

摘要:

三甘醇(TEG)脱水工艺是目前天然气工业应用较为普遍的一种方法。从高含硫气田采出来的天然气需要先脱除其中的水分,以防止水合物生成及减轻天然气输送过程中产生酸液带来的腐蚀危害。三甘醇脱水工艺在各集气站中已经得到广泛使用,但不同的脱水工艺对管道和设备的腐蚀存在差别。通过HYSYS模拟,对三甘醇脱水典型工艺、再生废气回收利用工艺、三甘醇高压富液气提工艺、三甘醇低压富液气提工艺4种脱水工艺进行了论证。分析得出,三甘醇低压富液气提工艺的脱水效果好,减轻了对设备的腐蚀,并能显著降低H₂S的排放,有效解决了再生废气的污染等问题,具有较高的推广价值。

Abstract:

The triethylene glycol(hereinafter short for TEG) dehydration process is widely applied in natural gas industry at present. Dehydration is necessary for natural gas extracted from high sulfur content gas field to prevent the formation of hydrates and reduce the corrosion hazard caused by the acid fluid generated during natural gas transportation. The TEG dehydration process has been used at gas gathering stations, but the corrosion degree of different TEG dehydration processes on pipes and equipments are different. Through HYSYS simulation, four TEG dehydration processes were demonstrated which including typical process of TEG dehydration, regeneration gas recovery process, TEG high pressure rich liquid gas stripping process and low pressure rich liquid gas stripping process. The analysis results showed that the TEG low pressure rich liquid gas stripping process had good dehydration effect. It reduced the corrosion of equipments and reduced the H₂S emissions significantly, which could solve the pollution problems of regenerated exhaust gas effectively. Therefore, the TEG low pressure rich liquid gas stripping process has prodigious popularization value.