无机盐与硫化氢对天然气三甘醇脱水的影响

目的探究无机盐与硫化氢(H₂S)对天然气三甘醇脱水的影响规律。 方法综述了无机盐与硫化氢在三甘醇脱水性、再生性、流变性、发泡消泡性能以及腐蚀性等方面对天然气三甘醇脱水的影响。 结果随着三甘醇溶液中无机盐和硫化氢的富集,三甘醇溶液流变性下降,易发泡且消泡困难,还会与三甘醇发生反应,引起三甘醇变质,脱水效果明显下降。含硫化氢的三甘醇溶液具有腐蚀性,腐蚀管道和设备后产生铁离子,进一步影响三甘醇的性能。 结论由于三甘醇自身的化学结构易受破坏以及外界高温环境,使得三甘醇易发生变质。在天然气采用MDEA进行脱硫时,需要控制MDEA的添加量。建议:①深入研究三甘醇变质机理；②建立各无机盐离子与硫化氢对三甘醇溶液脱水性能影响的模型；③建立统一的三甘醇溶液废弃标准。 

Effect of inorganic salt and hydrogen sulfide on triethylene glycol dehydration of natural gas

ObjectiveInvestigate the effect of inorganic salts and hydrogen sulfide(H₂S) on triethylene glycol dehydration of natural gas. Methods The effects of inorganic salts and hydrogen sulfide on triethylene glycol dehydration of natural gas in the aspects of dehydration, regeneration, rheology, foaming and defoaming properties and corrosiveness were reviewed. ResultsWith the enrichment of inorganic salt and hydrogen sulfide in triethylene glycol solution, the rheological property of triethylene glycol solution decreased, foaming was easy and defoaming was difficult, and it would react with triethylene glycol, resulting in the deterioration of triethylene glycol, and the dehydration effect decreased obviously. The triethylene glycol solution containing hydrogen sulfide was corrosive and produced iron ions after corroding pipes and equipment, which further affected the performance of triethylene glycol. ConclusionsBecause the chemical structure of triethylene glycol is easy to be destroyed and the ambient temperature is high, triethylene glycol is easy to deteriorate. When MDEA is used for desulfurization of natural gas, it is necessary to control the amount of MDEA. Suggestions indlude:(1) Study the deterioration mechanism of triethylene glycol deeply; (2) Establish a model for the effect of various inorganic salt ions and hydrogen sulfide on the dehydration of triethylene glycol solution; (3) Establish a unified standard for discarding triethylene glycol solution.