enhanced glycol dehydration tech- nology such as stripping gas injec- tion into the regenerator reboiler, the DRIZO process, and coldfinger technology, would be beneficial to allow production facilities to select the best option. References 1 Kong, Zong Yang, et al , Revamping existing glycol technologies n natural gas dehydration to improve the purity and absorption efficiency: available methods and recent developments, Journal of Natural Gas Science and Engineering , 56, 2018, 486–503. 2 Barelli L, et al , Dehydration and low temperature separation technologies for liquified natural gas production via electrolysis: a systematic review, Journal of Energy Storage, 30, 2020, 101471. 3 Sheilan M H, Weiland R H, Evaluate the cause of reduced capacity in a TEG Dehydration System, Gas Processing , Jan/Feb 2017. 4 Carmody P A, Designing glycol dehydration units that utilize Stahl columns with stripping gas, Laurence Reid Gas Conditioning Conference, Norman, OK, Feb 24–27, 2020. 5 Bestani B, K S Shing, Infinite-Dilution activity coefficients of water In TEG, PEG, glycerol and their mixtures in the temperature range 50 to 140°C, Fluid Phase Equilibria, 50(1-2), 1989, 209–221.
Lastly, operating at turndown with structured packing in the Stahl column can negatively impact column performance since the dehydration level is sensitive to packing depth (primarily wetted interfacial area). This can be engi- neered around with larger sales gas percentage losses at turndown and some energy expense to main- tain sufficient solvent circulation to properly irrigate the packing. Upside However, if these design flaws are recognised and accounted for, there is significant economic upside in favour of using a TEG Stahl process over molecular sieves, as shown by the independent cost estima- tion. Therefore, Stahl columns as an alternative to molecular sieves offer significant upside potential that demands further investiga- tion. To perform this investigation, there should be a further analysis of the practical pitfalls inherent in the Stahl column process. Additionally, while this study focused on the same feed gas rate, composition, and design specs, these variables should be inves- tigated. Comparison of the Stahl column method with alternative
engineering from the University of Rochester and a PhD in chemical engineering from the University of Texas at Austin. Nathan A Hatcher is Engineering Consultant at OGT, spearheading the development of a new Consulting Group to leverage OGT’s substantial breadth and depth in gas treating and sulphur recovery. He holds a BS in chemical engineering from the University of Kansas, is a registered professional engineer in the state of Kansas, and currently a member of the industry Amine Best Practices Group. Daryl Jensen is a development engineer at OGT, experienced in design/development, simulation, basic engineering design package project execution, process control design, and on-site start-up/troubleshooting. He holds BS and MS degrees in electrical engineering from New Mexico State University and is a registered professional engineer in Texas. Ralph H Welland is OGT’s Chairman. He began working in the area of gas treating in graduate school and has been active in basic and applied research in this field ever since. He holds BASc, MASc, and PhD degrees in chemical engineering from the University of Toronto, and was a post-doctoral fellow in applied mathematics at the University of Western Australia. Chris Villegas is Chief Executive Officer at Reset Energy, Midland, Texas, experienced in conceptual design, installation, and plant equipment operations in oil and gas. He holds a Bachelor’s degree in chemical engineering from Texas Tech University.
Jeffrey Weinfeld is a development engineer at OGT. He holds a BSc in chemical
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