天然气脱水工艺乙二醇损耗原因分析及应对策略

Analysis of Ethylene Glycol Loss in Natural Gas Dehydration Process and Countermeasures

摘要

在陆上集气站、净化厂及海上平台的天然气脱水系统中，乙二醇类溶剂既可作为低温工况的水合物抑制剂，也可作为甘醇吸收法的循环脱水剂。乙二醇损耗并非单一设备问题，常由气相夹带、发泡污染、再生放空挥发与现场排污清洗等因素共同驱动，且在含液烃上升、压缩机工况波动和装置启停频繁时更易累积。损耗上升会引起脱水深度下降、泵阀磨蚀与污水含醇增加。同时，海上场景常配套乙二醇再生回收单元，溶剂损耗还会通过污水路径体现。本文对中国典型站场乙二醇损耗成因进行拆解，并提出面向运行维护的控制策略。

Abstract

In the natural gas dehydration systems of onshore gas gathering stations, purification plants, and offshore platforms, ethylene glycol solvents can serve both as hydrate inhibitors under low-temperature conditions and as circulating dehydrating agents in glycol absorption processes. Ethylene glycol loss is not a single equipment issue but is often driven by factors such as gas entrainment, foaming contamination, regeneration venting volatilization, and on-site cleaning and drainage. The loss tends to accumulate more easily during conditions of rising liquid hydrocarbon levels, compressor operation fluctuations, and frequent equipment startups and shutdowns. Increased loss can lead to reduced dehydration depth, pump and valve erosion, and higher alcohol content in wastewater. Additionally, offshore scenarios often include ethylene glycol regeneration and recovery units, where solvent loss is also reflected through wastewater pathways. This paper analyzes the causes of ethylene glycol loss in typical China gas stations and proposes control strategies for operation and maintenance.

关键词

天然气 / 脱水工艺 / 乙二醇损耗 / 原因分析 / 应对策略

Key words

natural gas / dehydration process / ethylene glycol loss / cause analysis / countermeasures

参考文献

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