重庆工商大学学报（自然科学版）2024，Vol.41Issue(4)：53-60,8.DOI:10.16055/j.issn.1672-058X.2024.0004.007
天然气气化炉内介质乙二醇非稳态耦合热流场研究
Unsteady Coupled Heat Flow Field of Medium Ethylene Glycol in Natural Gas Gasifier
摘要
Abstract
Objective The efficient gasification of liquefied natural gas(LNG)is a key influencing factor in the industrial application of natural gas.In order to improve the operation efficiency of the existing gasification equipment in the context of national energy reform,ANSYS Fluent software was used to numerically simulate the unsteady coupled heat flow field in a natural gas gasifier using ethylene glycol as the intermediate heat-carrying medium.Methods The heat and mass transfer mechanism of natural gas gasifiers was studied in depth.It was found that previous studies only considered convective heat transfer.Considering the radiative heat transfer,a coupled heat transfer model of unsteady natural convection and medium participating radiation in a large space was constructed.The boundary conditions were verified and calibrated by natural gas heating and heat transfer flow experimental equipment.The correctness of the numerical analysis model was verified.Results When the running time of the gasifier with ethylene glycol as the intermediate heat-carrying medium reached 2.0 h,the heat transfer tended to be stable.As the internal thermal flow field was no longer obviously disturbed,the gasifier entered a stable operation stage.At this time,the overall heating efficiency in the furnace was only 87.35％,in which the medium participating radiation accounted for 27.01％of the total heat transfer.In addition,a small range of low-temperature zones was formed at the bottom of the gasifier,indicating that there was a flow dead angle that was difficult to eliminate in its internal operation under this working condition.Conclusion Under the working conditions set in this paper,the internal flow field distribution of the large cylinder natural gas gasifier is not good,and the heating efficiency and start-up time of the gasifier need to be further optimized.The main form of heat transfer in the furnace is still natural convection,but the contribution of medium participating radiation to the total heat transfer cannot be ignored.关键词
加热气化/非稳态/耦合传热模型/加热效率Key words
heating gasification/non-steady state/coupled heat transfer model/heating efficiency分类
能源科技引用本文复制引用
张栩宁,郭韵..天然气气化炉内介质乙二醇非稳态耦合热流场研究[J].重庆工商大学学报（自然科学版）,2024,41(4):53-60,8.基金项目
国家自然科学基金资助项目(51606116) （51606116）
上海市科学技术委员会科技创新行动计划资助项目(19195810800). （19195810800）
