Water vapors are found in high concentrations during natural gas production and processing. Energy consumption is known to be a drawback of the glycol dehydration process. Toxic and greenhouse gas emissions are another drawback from the environmental point of view. This paper served to propose a solution to the two problems together by using an emissions stream from the regenerator distillation tower to serve as a striping gas which solved the environmental problem of emissions and helped to reduce energy consumption. Aspen HYSYS was used to model glycol dehydrating as the most widely used and economically viable technique for drying off natural gas streams. This method uses the solvent tri ethylene glycol (TEG) as the absorbent. The focus of this research is to analyze sensitivity to the modeling outcomes. Furthermore, the results suggest that the process might be enhanced and save energy consumption. The simulation used three different tri-ethylene glycol flows, stripping gas flows, and different reboiler temperatures were used in the simulation. The modeling technique was effective in decreasing the water content in the regeneration column from 75lb/MMSCF to 2.5lb/MMSCF and saving energy consumption during the dehydration of natural gas. However, the results showed that in the fourth case when the amount of triethylene glycol is equal to 665.3 kg/h, and reboiler energy is equal to 247300 kJ/h, therefore the energy consumed per kilogram of the TEG is equal to 371.7 kJ/kg which represents the lowest amount of energy consumed during solvent regeneration. However, the results suggest that using emissions as a stripping gas can increase TEG purity and boost the efficiency of the dehydration plant, which appears to be a better option in the long run. The results suggest that the demonstrated approach may help towards decarbonization and zero emission of the dehydration process.

中文翻译：

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天然气脱水过程的化学强化和能耗评估

在天然气生产和加工过程中会发现高浓度的水蒸气。众所周知，能量消耗是乙二醇脱水过程的一个缺点。从环境角度来看，有毒气体和温室气体排放是另一个缺点。本文旨在提出一种解决这两个问题的方法，即利用再生蒸馏塔的排放物流作为汽提气，解决了排放的环境问题，并有助于降低能源消耗。 Aspen HYSYS 用于对乙二醇脱水进行建模，该脱水是使用最广泛且经济可行的天然气流干燥技术。该方法使用溶剂三乙二醇（TEG）作为吸收剂。这项研究的重点是分析对建模结果的敏感性。此外，结果表明该过程可能会得到加强并节省能源消耗。该模拟使用了三种不同的三乙二醇流量、汽提气体流量，并且在模拟中使用了不同的再沸器温度。该建模技术有效地将再生塔中的水含量从75lb/MMSCF降低至2.5lb/MMSCF，并节省了天然气脱水过程中的能耗。然而，结果表明，在第四种情况下，当三甘醇用量等于665.3 kg/h，再沸器能量等于247300 kJ/h时，因此每公斤TEG消耗的能量等于371.7 kJ/ kg，代表溶剂再生过程中消耗的最低能量。然而，结果表明，使用排放物作为汽提气可以提高 TEG 纯度并提高脱水装置的效率，从长远来看，这似乎是更好的选择。结果表明，所论证的方法可能有助于脱水过程的脱碳和零排放。