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Quantification of the risk for hydrate formation during cool down in a dispersed oil-water system
곽계훈,이건홍,이보람,Amadeu K. Sum 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.7
Gas hydrates are considered a nuisance in the flow assurance of oil and gas production since they can block the flowlines, consequently leading to significant losses in production. Hydrate avoidance has been the traditional approach, but recently, hydrate management is gaining acceptance because the practice of hydrate avoidance has become more and more challenging. For better management of hydrate formation, we investigated the risk of hydrate formation based on the subcooling range in which hydrates form by associating low, medium, and high probability of formation for a gas+oil+water system. The results are based on batch experiments which were performed in an autoclave cell using a mixture gas (CH4 : C3H8=91.9 : 8.1mol%), total liquid volume (200 ml), mineral oil, watercut (30%), and mixing speed (300 rpm). From the measurements of survival curves showing the minimum subcooling required before hydrate can form and hydrate conversion rates for the initial 20 minutes, we developed a risk map for hydrate formation.
철강공정 배기가스로부터 가스 하이드레이트 형성에 미치는 촉진제의 영향
곽계훈 ( Gye Hoon Kwak ),사정훈 ( Jeong Hoon Sa ),김시환 ( Si Hwan Kim ),이보람 ( Bo Ram Lee ),이건홍 ( Kun Hong Lee ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.1
본 연구에서는 가스 하이드레이트 기술을 이용하여 철강 공정 배기가스로부터 CO2를 분리하는데 사용하는 여러 촉진제의 성능을 조사하였다. 이 실험에서는 CO2/N2 혼합가스 (CO2/N2=20/80, 40/60)와 CO2/N2 이외에 CO, H2가 첨가된Blast furnace gas (BFG) 모델 가스를 대상 가스로 사용하였다. 촉진제로는 구조 II 하이드레이트를 형성한다고 알려진tetrahydrofuran (THF), propylene oxide, 1,4-dioxane 를 사용하였으며, 각 가스에 대하여 촉진제를 농도별로 첨가했을 때 상평형점의 변화를 측정하였다. 상평형점은 “연속” Quartz crystal microbalance (QCM) 방식을 이용하였다. 또한, Powder X-ray diffraction (PXRD) 분석을 통하여 촉진제의 첨가가 가스 하이드레이트 구조에 미치는 영향을 알아보았다. In this work, the performance of various promoters was investigated used in CO2 separation from the gases emitted from steel-making process using gas hydrate technology. The studied promoters are tetrahydrofuran (THF), propylene oxide and 1,4-dioxane, which are all expected to form a structure II hydrate, and the target gases include CO2/N2 mixed gases (CO2/N2 = 20/80 and 40/60) and Blast Furnace Gas (BFG). The phase equilibrium points were measured when each promoter was added with various concentrations. For fast acquisition of abundant data, the "continuous" Quartz crystal microbalance (QCM) method was employed. In addition, the crystal structure of each gas hydrate was analyzed by Powder X-ray diffraction (PXRD).
Thermodynamic promoter effects on the phase equilibrium of BFG(Blast Furnace Gas) hydrate
이보람(Lee, Bo Ram),사정훈(Sa, Jeong-Hoon),박다혜(Park, Da-Hye),곽계훈(Kwak, Kye-Hoon),이건홍(Lee, Kun-Hong) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
CO₂ separation from a flue gas by using the gas hydrate technology was suggested by Kang et al. They reported phase equilibrium conditions of mixed gases composed of CO₂ and N2 with THF as a thermodynamic promoter. In this study, we reported the phase equilibrium conditions of a mixed gas which had a realistic composition of the blast furnace gas (BFG) emitted from the steel-making process. The phase equilibrium measurements were done by using the continuous QCM method, and the results demonstrate that this method is efficient and as accurate as the conventional temperature search method.